/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page stylesheet.html
\title Qt Style Sheets
\brief How to use style sheets to customize the appearance of widgets.
\ingroup frameworks-technologies
\previouspage {Implementing Styles and Style Aware Widgets}{Styles}
\contentspage Widgets and Layouts
\nextpage The Style Sheet Syntax
\keyword style sheet
\keyword stylesheet
Qt Style Sheets are a powerful mechanism that allows you to
customize the appearance of widgets, in addition to what is
already possible by subclassing QStyle. The concepts,
terminology, and syntax of Qt Style Sheets are heavily inspired
by HTML \l{http://www.w3.org/Style/CSS/}{Cascading Style Sheets
(CSS)} but adapted to the world of widgets.
Topics:
\list
\i \l{Overview}
\i \l{The Style Sheet Syntax}
\i \l{Qt Designer Integration}
\i \l{Customizing Qt Widgets Using Style Sheets}
\i \l{Qt Style Sheets Reference}
\i \l{Qt Style Sheets Examples}
\endlist
\target overview
\section1 Overview
Styles sheets are textual specifications that can be set on the
whole application using QApplication::setStyleSheet() or on a
specific widget (and its children) using
QWidget::setStyleSheet(). If several style sheets are set at
different levels, Qt derives the effective style sheet from all
of those that are set. This is called cascading.
For example, the following style sheet specifies that all
\l{QLineEdit}s should use yellow as their background color, and
all \l{QCheckBox}es should use red as the text color:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 0
For this kind of customization, style sheets are much more
powerful than QPalette. For example, it might be tempting to set
the QPalette::Button role to red for a QPushButton to obtain a
red push button. However, this wasn't guaranteed to work for all
styles, because style authors are restricted by the different
platforms' guidelines and (on Windows XP and Mac OS X) by the
native theme engine.
Style sheets let you perform all kinds of customizations that are
difficult or impossible to perform using QPalette alone. If you
want yellow backgrounds for mandatory fields, red text for
potentially destructive push buttons, or fancy check boxes, style
sheets are the answer.
Style sheets are applied on top of the current \l{QStyle}{widget
style}, meaning that your applications will look as native as
possible, but any style sheet constraints will be taken into
consideration. Unlike palette fiddling, style sheets offer
guarantees: If you set the background color of a QPushButton to be
red, you can be assured that the button will have a red background
in all styles, on all platforms. In addition, \l{Qt Designer}
provides style sheet integration, making it easy to view the effects
of a style sheet in different \l{QStyle}{widget styles}.
In addition, style sheets can be used to provide a distinctive
look and feel for your application, without having to subclass
QStyle. For example, you can specify arbitrary images for radio
buttons and check boxes to make them stand out. Using this
technique, you can also achieve minor customizations that would
normally require subclassing several style classes, such as
specifying a \l{QStyle::styleHint()}{style hint}. The
\l{widgets/stylesheet}{Style Sheet} example depicted below defines
two distinctive style sheets that you can try out and modify at
will.
\table
\row \o \inlineimage stylesheet-coffee-xp.png
\o \inlineimage stylesheet-pagefold.png
\row \o Coffee theme running on Windows XP
\o Pagefold theme running on Windows XP
\endtable
\table
\row \o \inlineimage stylesheet-coffee-cleanlooks.png
\o \inlineimage stylesheet-pagefold-mac.png
\row \o Coffee theme running on Ubuntu Linux
\o Pagefold theme running on Mac OS X
\endtable
When a style sheet is active, the QStyle returned by QWidget::style()
is a wrapper "style sheet" style, \e not the platform-specific style. The
wrapper style ensures that any active style sheet is respected and
otherwise forwards the drawing operations to the underlying,
platform-specific style (e.g., QWindowsXPStyle on Windows XP).
Since Qt 4.5, Qt style sheets fully supports Mac OS X.
\warning Qt style sheets are currently not supported for custom QStyle
subclasses. We plan to address this in some future release.
*/
/*!
\page stylesheet-syntax.html
\contentspage {Qt Style Sheet}{Contents}
\previouspage Qt Style Sheet
\nextpage Qt Designer Integration
\title The Style Sheet Syntax
Qt Style Sheet terminology and syntactic rules are almost
identical to those of HTML CSS. If you already know CSS, you can
probably skim quickly through this section.
\tableofcontents
\section1 Style Rules
Style sheets consist of a sequence of style rules. A \e{style
rule} is made up of a selector and a declaration. The
\e{selector} specifies which widgets are affected by the rule;
the \e{declaration} specifies which properties should be set on
the widget. For example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 1
In the above style rule, \c QPushButton is the selector and \c{{
color: red }} is the declaration. The rule specifies that
QPushButton and its subclasses (e.g., \c MyPushButton) should use
red as their foreground color.
Qt Style Sheet is generally case insensitive (i.e., \c color,
\c Color, \c COLOR, and \c cOloR refer to the same property).
The only exceptions are class names,
\l{QObject::setObjectName()}{object names}, and Qt property
names, which are case sensitive.
Several selectors can be specified for the same declaration,
using commas (\c{,}) to separate the selectors. For example,
the rule
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 2
is equivalent to this sequence of three rules:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 3
The declaration part of a style rule is a list of
\tt{\e{property}: \e{value}} pairs, enclosed in braces (\c{{}})
and separated with semicolons. For example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 4
See the \l{List of Properties} section below for the list of
properties provided by Qt widgets.
\section1 Selector Types
All the examples so far used the simplest type of selector, the
Type Selector. Qt Style Sheets support all the
\l{http://www.w3.org/TR/REC-CSS2/selector.html#q1}{selectors
defined in CSS2}. The table below summarizes the most useful
types of selectors.
\table 100%
\header
\o Selector
\o Example
\o Explanation
\row
\o Universal Selector
\o \c *
\o Matches all widgets.
\row
\o Type Selector
\o \c QPushButton
\o Matches instances of QPushButton and of its subclasses.
\row
\o Property Selector
\o \c{QPushButton[flat="false"]}
\o Matches instances of QPushButton that are not
\l{QPushButton::}{flat}. You may use this selector to test
for any Qt \l{Qt's Property System}{property} that supports
QVariant::toString() (see the \l{QVariant::}{toString()}
function documentation for details). In addition, the
special \c class property is supported, for the name of the
class.
This selector may also be used to test dynamic properties.
For more information on customization using dynamic properties,
refer to \l{Customizing Using Dynamic Properties}.
Instead of \c =, you can also use \c ~= to test whether a
Qt property of type QStringList contains a given QString.
\warning If the value of the Qt property changes after the
style sheet has been set, it might be necessary to force a
style sheet recomputation. One way to achieve this is to
unset the style sheet and set it again.
\row
\o Class Selector
\o \c .QPushButton
\o Matches instances of QPushButton, but not of its subclasses.
This is equivalent to \c{*[class~="QPushButton"]}.
\row
\o ID \target ID Selector
Selector
\o \c{QPushButton#okButton}
\o Matches all QPushButton instances whose
\l{QObject::objectName}{object name} is \c okButton.
\row
\o Descendant Selector
\o \c{QDialog QPushButton}
\o Matches all instances of QPushButton that are descendants
(children, grandchildren, etc.) of a QDialog.
\row
\o Child Selector
\o \c{QDialog > QPushButton}
\o Matches all instances of QPushButton that are direct
children of a QDialog.
\endtable
\section1 Sub-Controls
For styling complex widgets, it is necessary to access subcontrols of the
widget, such as the drop-down button of a QComboBox or the up and down
arrows of a QSpinBox. Selectors may contain \e{subcontrols} that make it
possible to restrict the application of a rule to specific widget
subcontrols. For example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 5
The above rule styles the drop-down button of all \l{QComboBox}es.
Although the double-colon (\c{::}) syntax is reminiscent of CSS3
Pseudo-Elements, Qt Sub-Controls differ conceptually from these and have
different cascading semantics.
Sub-controls are always positioned with respect to another element - a
reference element. This reference element could be the widget or another
Sub-control. For example, the \l{Qt Style Sheets Reference#drop-down-sub}
{::drop-down} of a QComboBox is placed, by default, in the top right corner
of the Padding rectangle of the QComboBox. The
\l{Qt Style Sheets Reference#drop-down-sub}{::drop-down} is placed,
by default, in the Center of the Contents rectangle of the
\l{Qt Style Sheets Reference#drop-down-sub}{::drop-down} Sub-control. See
the \l{List of Stylable Widgets} below for the Sub-controls to use to
style a widget and their default positions.
The origin rectangle to be used can be changed using the
\l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}
property. For example, if we want to place the drop-down in the margin
rectangle of the QComboBox instead of the default Padding rectangle, we
can specify:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 6
The alignment of the drop-down within the Margin rectangle is changed
using \l{Qt Style Sheets Reference#subcontrol-position-prop}
{subcontrol-position} property.
The \l{Qt Style Sheets Reference#width-prop}{width} and
\l{Qt Style Sheets Reference#height-prop}{height} properties can be used
to control the size of the Sub-control. Note that setting a
\l{Qt Style Sheets Reference#image-prop}{image} implicitly sets the size
of a Sub-control.
The relative positioning scheme
(\l{Qt Style Sheets Reference#position-prop}{position} : relative),
allows the position of the Sub-Control to be offset from its initial
position. For example, when the QComboBox's drop-down button is
pressed, we might like the arrow inside to be offset to give a
"pressed" effect. To achieve this, we can specify:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 7
The absolute positioning scheme
(\l{Qt Style Sheets Reference#position-prop}{position} : absolute),
allows the position and size of the Sub-control to be changed with
respect to the reference element.
Once positioned, they are treated the same as widgets and can be styled
using the \l{box model}.
See the \l{List of Sub-Controls} below for a list of supported
sub-controls, and \l{Customizing the QPushButton's Menu Indicator
Sub-Control} for a realistic example.
\note With complex widgets such as QComboBox and QScrollBar, if one
property or sub-control is customized, \bold{all} the other properties or
sub-controls must be customized as well.
\section1 Pseudo-States
Selectors may contain \e{pseudo-states} that denote that restrict
the application of the rule based on the widget's state.
Pseudo-states appear at the end of the selector, with a colon
(\c{:}) in between. For example, the following rule applies when
the mouse hovers over a QPushButton:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 8
Pseudo-states can be negated using the exclamation operator. For
example, the following rule applies when the mouse does not hover
over a QRadioButton:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 9
Pseudo-states can be chained, in which case a logical AND is
implied. For example, the following rule applies to when the
mouse hovers over a checked QCheckBox:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 10
Negated Pseudo-states may appear in Pseudo-state chains. For example,
the following rule applies when the mouse hovers over a QPushButton
that is not pressed:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 11
If needed, logical OR can be expressed using the comma operator:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 12
Pseudo-states can appear in combination with subcontrols. For
example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 13
See the \l{List of Pseudo-States} section below for the list of
pseudo-states provided by Qt widgets.
\section1 Conflict Resolution
Conflicts arise when several style rules specify the same
properties with different values. Consider the following style
sheet:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 14
Both rules match QPushButton instances called \c okButton and
there is a conflict for the \c color property. To resolve this
conflict, we must take into account the \e specificity of the
selectors. In the above example, \c{QPushButton#okButton} is
considered more specific than \c QPushButton, because it
(usually) refers to a single object, not to all instances of a
class.
Similarly, selectors with pseudo-states are more specific than
ones that do not specify pseudo-states. Thus, the following style
sheet specifies that a \l{QPushButton} should have white text
when the mouse is hovering over it, otherwise red text:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 15
Here's a tricky one:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 16
Here, both selectors have the same specificity, so if the mouse
hovers over the button while it is enabled, the second rule takes
precedence. If we want the text to be white in that case, we can
reorder the rules like this:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 17
Alternatively, we can make the first rule more specific:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 18
A similar issue arises in conjunction with Type Selectors.
Consider the following example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 19
Both rules apply to QPushButton instances (since QPushButton
inherits QAbstractButton) and there is a conflict for the
\l{Qt Style Sheets Reference#color-prop}{color} property. Because QPushButton
inherits QAbstractButton, it might be tempting to assume that
\c QPushButton is more specific than \c QAbstractButton. However,
for style sheet computations, all Type Selectors have the same
specificity, and the rule that appears last takes precedence. In
other words, \l{Qt Style Sheets Reference#color-prop}{color} is set to \c gray
for all \l{QAbstractButton}s, including \l{QPushButton}s. If we really
want \l{QPushButton}s to have red text, we can always reorder the
rules.
For determining the specificity of a rule, Qt Style Sheets follow
the
\l{http://www.w3.org/TR/REC-CSS2/cascade.html#specificity}{CSS2
Specification}:
\quotation
\e{A selector's specificity is calculated as follows:}
\list
\o \e{count the number of ID attributes in the selector (= a)}
\o \e{count the number of other attributes and pseudo-classes in the selector (= b)}
\o \e{count the number of element names in the selector (= c)}
\o \e{ignore pseudo-elements [i.e., \l{subcontrols}].}
\endlist
\e{Concatenating the three numbers a-b-c (in a number system with a
large base) gives the specificity.}
\e{Some examples:}
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 20
\endquotation
\section1 Cascading
Style sheets can be set on the QApplication, on parent widgets,
and on child widgets. An arbitrary widget's effective style sheet
is obtained by merging the style sheets set on the widget's
ancestors (parent, grandparent, etc.), as well as any style sheet
set on the QApplication.
When conflicts arise, the widget's own style sheet is always
preferred to any inherited style sheet, irrespective of the
specificity of the conflicting rules. Likewise, the parent
widget's style sheet is preferred to the grandparent's, etc.
One consequence of this is that setting a style rule on a widget
automatically gives it precedence over other rules specified in
the ancestor widgets' style sheets or the QApplication style
sheet. Consider the following example. First, we set a style
sheet on the QApplication:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 21
Then we set a style sheet on a QPushButton object:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 22
The style sheet on the QPushButton forces the QPushButton (and
any child widget) to have blue text, in spite of the more
specific rule set provided by the application-wide style sheet.
The result would have been the same if we had written
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 23
except that if the QPushButton had children (which is unlikely),
the style sheet would have no impact on them.
Style sheet cascading is a complex topic. Refer to the
\l{http://www.w3.org/TR/CSS2/cascade.html#cascade}{CSS2
Specification} for the gory details. Be aware that Qt currently
doesn't implement \c{!important}.
\section1 Inheritance
In classic CSS, when font and color of an item is not explicitly set,
it gets automatically inherited from the parent. When using Qt Style Sheets,
a widget does \bold{not} automatically inherit its font and color setting
from its parent widget.
For example, consider a QPushButton inside a QGroupBox:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 24
The QPushButton does not have an explicit color set. Hence, instead
of inheriting color of its parent QGroupBox, it has the system color.
If we want to set the color on a QGroupBox and its children,
we can write:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 25
In contrast, setting a font and propagate using QWidget::setFont() and
QWidget::setPalette() propagates to child widgets.
\section1 Widgets inside C++ namespaces
The Type Selector can be used to style widgets of a particular type. For
example,
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 26
Qt Style Sheet uses QObject::className() of the widget to determine
when to apply the Type Selector. When custom widgets are inside namespaces,
the QObject::className() returns <namespace>::<classname>. This conflicts
with the syntax for \l{Sub-Controls}. To overcome this problem,
when using the Type Selector for widgets inside namespaces, we must
replace the "::" with "--". For example,
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 27
\section1 Setting QObject properties
From 4.3 and above, any designable Q_PROPERTY
can be set using the qproperty-<property name> syntax.
For example,
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 28
If the property references an enum declared with Q_ENUMS, you should
reference its constants by name, i.e., not their numeric value.
*/
/*!
\page stylesheet-designer.html
\contentspage {Qt Style Sheet}{Contents}
\previouspage The Style Sheet Syntax
\nextpage Customizing Qt Widgets Using Style Sheets
\title Qt Designer Integration
\l{Qt Designer}{Qt Designer} is an excellent tool
to preview style sheets. You can right-click on any widget in Designer
and select \gui{Change styleSheet...} to set the style sheet.
\image designer-stylesheet-options.png
In Qt 4.2 and later, \l{Qt Designer}{Qt Designer} also includes a
style sheet syntax highlighter and validator. The validator indicates
if the syntax is valid or invalid, at the bottom left of the \gui{Edit
Style Sheet} dialog.
\image designer-validator-highlighter.png
When you click \gui{OK} or \gui{Apply}, \QD will automatically display
the widget with its new stylesheet.
\image designer-stylesheet-usage.png
*/
/*!
\page stylesheet-customizing.html
\contentspage {Qt Style Sheet}{Contents}
\previouspage Qt Designer Integration
\nextpage Qt Style Sheets Reference
\title Customizing Qt Widgets Using Style Sheets
When using style sheets, every widget is treated as a box with four
concentric rectangles: the margin rectangle, the border rectangle, the
padding rectangle, and the content rectangle. The box model describes
this in further detail.
\tableofcontents
\target box model
\section1 The Box Model
The four concentric rectangles appear conceptually as below:
\image stylesheet-boxmodel.png
\list
\o The margin falls outside the border.
\o The border is drawn between the margin and the padding.
\o The padding falls inside the border, between the border and
the actual contents.
\o The content is what is left from the original widget or
subcontrol once we have removed the margin, the border, and
the padding.
\endlist
The \l{Qt Style Sheets Reference#margin-prop}{margin},
\l{Qt Style Sheets Reference#border-width-prop}
{border-width}, and
\l{Qt Style Sheets Reference#padding-prop}{padding}
properties all default to zero. In that case, all four rectangles
(\c margin, \c border, \c padding, and \c content) coincide exactly.
You can specify a background for the widget using the
\l{Qt Style Sheets Reference#background-image-prop}{background-image}
property. By default, the background-image is drawn only for the area
inside the border. This can be changed using the
\l{Qt Style Sheets Reference#background-clip-prop}{background-clip}
property. You can use
\l{Qt Style Sheets Reference#background-repeat-prop}{background-repeat}
and
\l{Qt Style Sheets Reference#background-origin-prop}{background-origin}
to control the repetition and origin of the background image.
A background-image does not scale with the size of the widget. To provide
a "skin" or background that scales along with the widget size, one must
use
\l{Qt Style Sheets Reference#border-image-prop}{border-image}. Since the
border-image property provides an alternate background, it is not required
to specify a background-image when border-image is specified. In the case,
when both of them are specified, the border-image draws over the
background-image.
In addition, the \l{Qt Style Sheets Reference#image-prop}{image} property
may be used to draw an image over the border-image. The image specified does
not tile or stretch and when its size does not match the size of the widget,
its alignment is specified using the
\l{Qt Style Sheets Reference#image-position-prop}{image-position}
property. Unlike background-image and border-image, one may specify a
SVG in the image property, in which case the image is scaled automatically
according to the widget size.
The steps to render a rule are as follows:
\list
\o Set clip for entire rendering operation (border-radius)
\o Draw the background (background-image)
\o Draw the border (border-image, border)
\o Draw overlay image (image)
\endlist
\target sub controls
\section1 Sub-controls
A widget is considered as a hierarchy (tree) of subcontrols drawn on top
of each other. For example, the QComboBox draws the drop-down sub-control
followed by the down-arrow sub-control. A QComboBox is thus rendered as
follows:
\list
\o Render the QComboBox { } rule
\o Render the QComboBox::drop-down { } rule
\o Render the QComboBox::down-arrow { } rule
\endlist
Sub-controls share a parent-child relationship. In the case of QComboBox,
the parent of down-arrow is the drop-down and the parent of drop-down is
the widget itself. Sub-controls are positioned within their parent using
the \l{Qt Style Sheets Reference#subcontrol-position-prop}
{subcontrol-position} and
\l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}
properties.
Once positioned, sub-controls can be styled using the \l{box model}.
\note With complex widgets such as QComboBox and QScrollBar, if one
property or sub-control is customized, \bold{all} the other properties or
sub-controls must be customized as well.
*/
/*!
\page stylesheet-reference.html
\contentspage {Qt Style Sheet}{Contents}
\previouspage Customizing Qt Widgets Using Style Sheets
\nextpage Qt Style Sheets Examples
\title Qt Style Sheets Reference
Qt Style Sheets support various properties, pseudo-states, and
subcontrols that make it possible to customize the look of
widgets.
\tableofcontents
\section1 List of Stylable Widgets
The following table lists the Qt widgets that can be customized
using style sheets:
\table 100%
\header
\o Widget
\o How to Style
\row
\o QAbstractScrollArea \target qabstractscrollarea-widget
\o Supports the \l{box model}.
All derivatives of QAbstractScrollArea, including QTextEdit,
and QAbstractItemView (all item view classes), support
scrollable backgrounds using
\l{Qt Style Sheets Reference#background-attachment-prop}
{background-attachment}. Setting the background-attachment to
\c{fixed} provides a background-image that does not scroll with the
viewport. Setting the background-attachment to \c{scroll}, scrolls
the background-image when the scroll bars move.
See \l{Qt Style Sheets Examples#Customizing QAbstractScrollArea}
{Customizing QAbstractScrollArea} for an example.
\row
\o QCheckBox \target qcheckbox-widget
\o Supports the \l{box model}. The check indicator can be
styled using the \l{#indicator-sub}{::indicator}
subcontrol. By default, the indicator is placed in the Top
Left corner of the Contents rectangle of the widget.
The \l{#spacing-prop}{spacing} property
specifies the spacing between the check indicator and
the text.
See \l{Qt Style Sheets Examples#Customizing QCheckBox}
{Customizing QCheckBox} for an example.
\row
\o QColumnView \target qcolumnview-widget
\o The grip can be styled be using the \l{image-prop}{image} property.
The arrow indicators can by styled using the
\l{left-arrow-sub}{::left-arrow} subcontrol and the
\l{right-arrow-sub}{::right-arrow} subcontrol.
\row
\o QComboBox \target qcombobox-widget
\o The frame around the combobox can be styled using the
\l{box model}. The drop-down button can be styled using
the \l{#drop-down-sub}{::drop-down} subcontrol. By default, the
drop-down button is placed in the top right corner of the padding
rectangle of the widget. The arrow mark inside the drop-down button
can be styled using the \l{#down-arrow-sub}{::down-arrow}
subcontrol. By default, the arrow is placed in the center of the
contents rectangle of the drop-down subcontrol.
See \l{Qt Style Sheets Examples#Customizing QComboBox}{Customizing QComboBox}
for an example.
\row
\o QDateEdit \target qdateedit-widget
\o See \l{#qspinbox-widget}{QSpinBox}.
\row
\o QDateTimeEdit \target qdatetimeedit-widget
\o See \l{#qspinbox-widget}{QSpinBox}.
\row
\o QDialog \target qdialog-widget
\o Supports only the \l{Qt Style Sheets Reference#background-prop}{background},
\l{#background-clip-prop}{background-clip} and
\l{#background-origin-prop}{background-origin} properties.
\warning Make sure you define the Q_OBJECT macro for your custom
widget.
\row
\o QDialogButtonBox \target qdialogbuttonbox-widget
\o The layout of buttons can be altered using the
\l{#button-layout-prop}{button-layout} property.
\row
\o QDockWidget \target qdockwidget-widget
\o Supports styling of the title bar and the title bar buttons when docked.
The dock widget border can be styled using the \l{#border-prop}{border}
property. The \l{#title-sub}{::title} subcontrol can be used to customize
the title bar. The close and float buttons are positioned with respect
to the \l{title-sub}{::title} subcontrol using the
\l{#close-button-sub}{::close-button} and
\l{#float-button-sub}{::float-button} respectively.
When the title bar is vertical, the \l{#vertical-ps}{:vertical} pseudo
class is set. In addition, depending on QDockWidget::DockWidgetFeature,
the \l{#closable-ps}{:closable}, \l{#floatable-ps}{:floatable} and
\l{#movable-ps}{:movable} pseudo states are set.
\note Use QMainWindow::separator to style the resize handle.
\warning The style sheet has no effect when the QDockWidget is undocked
as Qt uses native top level windows when undocked.
See \l{Qt Style Sheets Examples#Customizing QDockWidget}
{Customizing QDockWidget} for an example.
\row
\o QDoubleSpinBox \target qdoublespinbox-widget
\o See \l{#qspinbox-widget}{QSpinBox}.
\row
\o QFrame \target qframe-widget
\o Supports the \l{box model}.
Since 4.3, setting a stylesheet on a QLabel automatically
sets the QFrame::frameStyle property to QFrame::StyledPanel.
See \l{Qt Style Sheets Examples#Customizing QFrame}{Customizing QFrame}
for an example.
\row
\o QGroupBox \target qgroupbox-widget
\o Supports the \l{box model}. The title can be styled using the
\l{#title-sub}{::title} subcontrol. By default, the title is placed
depending on QGroupBox::textAlignment.
In the case of a checkable QGroupBox, the title includes the
check indicator. The indicator is styled using the
the \l{#indicator-sub}{::indicator} subcontrol. The
\l{#spacing-prop}{spacing} property can be used to control
the spacing between the text and indicator.
See \l{Qt Style Sheets Examples#Customizing QGroupBox}{Customizing QGroupBox}
for an example.
\row
\o QHeaderView \target qheaderview-widget
\o Supports the \l{box model}. The sections of the header view are
styled using the \l{#section-sub}{::section} sub control. The
\c{section} Sub-control supports the \l{#middle-ps}{:middle},
\l{#first-ps}{:first}, \l{#last-ps}{:last},
\l{#only-one-ps}{:only-one}, \l{#next-selected-ps}{:next-selected},
\l{#previous-selected-ps}{:previous-selected},
\l{#selected-ps}{:selected},
and \l{#checked-ps}{:checked} pseudo states.
Sort indicator in can be styled using the
\l{#up-arrow-sub}{::up-arrow} and the
\l{#down-arrow-sub}{::down-arrow} Sub-control.
See \l{Qt Style Sheets Examples#Customizing QHeaderView}{Customizing QHeaderView}
for an example.
\row
\o QLabel \target qlabel-widget
\o Supports the \l{box model}. Does not support the
\l{#hover-ps}{:hover} pseudo-state.
Since 4.3, setting a stylesheet on a QLabel automatically
sets the QFrame::frameStyle property to QFrame::StyledPanel.
See \l{Qt Style Sheets Examples#Customizing QFrame}{Customizing QFrame} for an
example (a QLabel derives from QFrame).
\row
\o QLineEdit \target qlineedit-widget
\o Support the \l{box model}.
The color and background of the selected item is styled using
\l{#selection-color-prop}{selection-color} and
\l{#selection-background-color-prop}{selection-background-color}
respectively.
The password character can be styled using the
\l{#lineedit-password-character-prop}{lineedit-password-character}
property.
See \l{Qt Style Sheets Examples#Customizing QLineEdit}{Customizing QLineEdit}
for an example.
\row
\o QListView \target qlistview-widget
\o Supports the \l{box model}. When
\l{QAbstractItemView::alternatingRowColors}{alternating row colors}
is enabled, the alternating colors can be styled using the
\l{#alternate-background-color-prop}{alternate-background-color}
property.
The color and background of the selected item is styled using
\l{#selection-color-prop}{selection-color} and
\l{#selection-background-color-prop}{selection-background-color}
respectively.
The selection behavior is controlled by the
\l{#show-decoration-selected-prop}{show-decoration-selected} property.
Use the \l{#item-sub}{::item} subcontrol for more fine grained
control over the items in the QListView.
See \l{qabstractscrollarea-widget}{QAbsractScrollArea} to
style scrollable backgrounds.
See \l{Qt Style Sheets Examples#Customizing QListView}
{Customzing QListView} for an example.
\row
\o QListWidget \target qlistwidget-widget
\o See \l{#qlistview-widget}{QListView}.
\row
\o QMainWindow \target qmainwindow-widget
\o Supports styling of the separator
The separator in a QMainWindow when using QDockWidget is styled
using the \l{#separator-sub}{::separator} subcontrol.
See \l{Qt Style Sheets Examples#Customizing QMainWindow}{Customizing QMainWindow}
for an example.
\row
\o QMenu \target qmenu-widget
\o Supports the \l{box model}.
Individual items are styled using the \l{#item-sub}{::item}
subcontrol. In addition to the usually supported pseudo states,
\c{item} subcontrol supports the
\l{#selected-ps}{:selected}, \l{#default-ps}{:default},
\l{#exclusive-ps}{:exclusive} and the
\l{#non-exclusive-ps}{non-exclusive} pseudo states.
The indicator of checkable menu items is styled using the
\l{#indicator-sub}{::indicator} subcontrol.
The separator is styled using the \l{#separator-sub}{::separator}
subcontrol.
For items with a sub menu, the arrow marks are styled using the
\l{::right-arrow-sub}{right-arrow} and
\l{::left-arrow-sub}{left-arrow}.
The scroller is styled using the \l{#scroller-sub}{::scroller}.
The tear-off is styled using the \l{#tear-off-sub}{::tear-off}.
See \l{Qt Style Sheets Examples#Customizing QMenu}{Customizing QMenu}
for an example.
\row
\o QMenuBar \target qmenubar-widget
\o Supports the \l{box model}. The \l{#spacing-prop}{spacing}
property specifies the spacing between menu items.
Individual items are styled using the \l{#item-sub}{::item}
subcontrol.
\warning When running on Qt/Mac, the menu bar is usually embedded into the
system-wide menu bar. In this case, the style sheet will have no effect.
See \l{Qt Style Sheets Examples#Customizing QMenuBar}{Customizing QMenuBar}
for an example.
\row
\o QMessageBox \target qmessagebox-widget
\o The \l{#messagebox-text-interaction-flags-prop}
{messagebox-text-interaction-flags} property can be used to alter
the interaction with text in the message box.
\row
\o QProgressBar \target qprogressbar-widget
\o Supports the \l{box model}. The chunks of the progress bar
can be styled using the \l{#chunk-sub}{::chunk} subcontrol.
The chunk is displayed on the Contents rectangle of the widget.
If the progress bar displays text, use the \l{text-align-prop}{text-align}
property to position the text.
Indeterminate progress bars have the
\l{#indeterminate-ps}{:indeterminate} pseudo state set.
See \l{Qt Style Sheets Examples#Customizing QProgressBar}{Customizing QProgressBar}
for an example.
\row
\o QPushButton \target qpushbutton-widget
\o Supports the \l{box model}. Supports the \l{#default-ps}{:default},
\l{#flat-ps}{:flat}, \l{#checked-ps}{:checked} pseudo states.
For QPushButton with a menu, the menu indicator is styled
using the \l{#menu-indicator-sub}{::menu-indicator}
subcontrol. Appearance of checkable push buttons can be
customized using the \l{#open-ps}{:open} and
\l{#closed-ps}{:closed} pseudo-states.
\warning If you only set a background-color on a QPushButton, the background
may not appear unless you set the border property to some value. This is
because, by default, the QPushButton draws a native border which completely
overlaps the background-color. For example,
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 30
See \l{Qt Style Sheets Examples#Customizing QPushButton}{Customizing QPushButton}
for an example.
\row
\o QRadioButton \target qradiobutton-widget
\o Supports the \l{box model}. The check indicator can be
styled using the \l{#indicator-sub}{::indicator}
subcontrol. By default, the indicator is placed in the Top
Left corner of the Contents rectangle of the widget.
The \l{#spacing-prop}{spacing} property
specifies the spacing between the check indicator and
the text.
See \l{Qt Style Sheets Examples#Customizing QRadioButton}
{Customizing QRadioButton} for an example.
\row
\o QScrollBar \target qscrollbar-widget
\o Supports the \l{box model}. The Contents rectangle of the widget
is considered to be the groove over which the slider moves. The extent
of the QScrollBar (i.e the width or the height depending on the orientation)
is set using the \l{#width-prop}{width} or \l{#height-prop}{height} property
respectively. To determine the orientation, use the
\l{#horizontal-ps}{:horizontal} and the \l{vertical-ps}{:vertical}
pseudo states.
The slider can be styled using the \l{#handle-sub}{::handle} subcontrol.
Setting the \l{#min-width-prop}{min-width} or \l{#min-height-prop}{min-height}
provides size contraints for the slider depending on the orientation.
The \l{add-line-sub}{::add-line} subcontrol can be used to style the
button to add a line. By default, the add-line subcontrol is placed in
top right corner of the Border rectangle of the widget. Depending on the
orientation the \l{#right-arrow-sub}{::right-arrow} or
\l{#down-arrow-sub}{::down-arrow}. By default, the arrows are placed in
the center of the Contents rectangle of the add-line subcontrol.
The \l{sub-line-sub}{::sub-line} subcontrol can be used to style the
button to subtract a line. By default, the sub-line subcontrol is placed in
bottom right corner of the Border rectangle of the widget. Depending on the
orientation the \l{#left-arrow-sub}{::left-arrow} or
\l{#up-arrow-sub}{::up-arrow}. By default, the arrows are placed in
the center of the Contents rectangle of the sub-line subcontrol.
The \l{sub-page-sub}{::sub-page} subcontrol can be used to style the
region of the slider that subtracts a page. The \l{add-page-sub}{::add-page}
subcontrol can be used to style the region of the slider that adds a page.
See \l{Qt Style Sheets Examples#Customizing QScrollBar}{Customizing QScrollBar}
for an example.
\row
\o QSizeGrip \target qsizegrip-widget
\o Supports the \l{#width-prop}{width},
\l{#height-prop}{height}, and \l{#image-prop}{image}
properties.
See \l{Qt Style Sheets Examples#Customizing QSizeGrip}{Customizing QSizeGrip}
for an example.
\row
\o QSlider \target qslider-widget
\o Supports the \l{box model}. For horizontal slides, the
\l{min-width-prop}{min-width} and \l{height-prop}{height}
properties must be provided. For vertical sliders, the
\l{min-height-prop}{min-height} and \l{width-prop}{width}
properties must be provided.
The groove of the slider is styled
using the \l{#groove-sub}{::groove}. The groove is
positioned by default in the Contents rectangle of the widget.
The thumb of the slider is styled using \l{#handle-sub}{::handle}
subcontrol. The subcontrol moves in the Contents rectangle of
the groove subcontrol.
See \l{Qt Style Sheets Examples#Customizing QSlider}{Customizing QSlider}
for an example.
\row
\o QSpinBox \target qspinbox-widget
\o The frame of the spin box can be styled using the \l{box
model}.
The up button and arrow can be styled using the
\l{#up-button-sub}{::up-button} and
\l{#up-arrow-sub}{::up-arrow} subcontrols. By default,
the up-button is placed in the top right corner in the
Padding rectangle of the widget. Without an explicit size,
it occupies half the height of its reference rectangle.
The up-arrow is placed in the center of the Contents
rectangle of the up-button.
The down button and arrow can be styled using the
\l{#down-button-sub}{::down-button} and
\l{#down-arrow-sub}{::down-arrow} subcontrols. By default,
the down-button is placed in the bottom right corner in the
Padding rectangle of the widget. Without an explicit size,
it occupies half the height of its reference rectangle.
The bottom-arrow is placed in the center of the Contents
rectangle of the bottom-button.
See \l{Qt Style Sheets Examples#Customizing QSpinBox}{Customizing QSpinBox}
for an example.
\row
\o QSplitter \target qsplitter-widget
\o Supports the \l{box model}. The handle of the splitter
is styled using the \l{#handle-sub}{::handle} subcontrol.
See \l{Qt Style Sheets Examples#Customizing QSplitter}{Customizing QSplitter}
for an example.
\row
\o QStatusBar \target qstatusbar-widget
\o Supports only the \l{Qt Style Sheets Reference#background-prop}
{background} property.
The frame for individual items can be style using the
\l{#item-sub}{::item} subcontrol.
See \l{Qt Style Sheets Examples#Customizing QStatusBar}{Customizing QStatusBar}
for an example.
\row
\o QTabBar \target qtabbar-widget
\o Individual tabs may be styled using the \l{#tab-sub}{::tab} subcontrol.
Close buttons using the \l{#close-button-sub}{::close-button}
The tabs support the
\l{#only-one-ps}{:only-one}, \l{#first-ps}{:first},
\l{#last-ps}{:last}, \l{#middle-ps}{:middle},
\l{#previous-selected-ps}{:previous--selected},
\l{#next-selected-ps}{:next-selected},
\l{#selected-ps}{:selected} pseudo states.
The \l{#top-ps}{:top}, \l{#left-ps}{:left}, \l{#right-ps}{:right},
\l{#bottom-ps}{:bottom} pseudo states depending on the orientation
of the tabs.
Overlapping tabs for the selected state are created by using
negative margins or using the \c{absolute} position scheme.
The tear indicator of the QTabBar is styled using the
\l{#tear-sub}{::tear} subcontrol.
QTabBar used two QToolButtons for its scrollers that can be styled
using the \c{QTabBar QToolButton} selector. To specify the width
of the scroll button use the \l{#scroller-sub}{::scroller}
subcontrol.
The alignment of the tabs within the QTabBar is styled
using the \l{#Alignment}{alignment} property. \warning
To change the position of the QTabBar within a QTabWidget, use the
\l{#tab-bar-sub}{tab-bar} subcontrol (and set subcontrol-position).
See \l{Qt Style Sheets Examples#Customizing QTabWidget and QTabBar}{Customizing QTabBar}
for an example.
\row
\o QTabWidget \target qtabwidget-widget
\o The frame of the tab widget is styled using the
\l{#pane-sub}{::pane} subcontrol. The left and right
corners are styled using the \l{#left-corner-sub}{::left-corner}
and \l{#right-corner-sub}{::right-corner} respectively.
The position of the tab bar is controlled using the
\l{#tab-bar-sub}{::tab-bar} subcontrol.
By default, the subcontrols have positions of a QTabWidget in
the QWindowsStyle. To place the QTabBar in the center, set the
subcontrol-position of the tab-bar subcontrol.
The \l{#top-ps}{:top}, \l{#left-ps}{:left}, \l{#right-ps}{:right},
\l{#bottom-ps}{:bottom} pseudo states depending on the orientation
of the tabs.
See \l{Qt Style Sheets Examples#Customizing QTabWidget and QTabBar}
{Customizing QTabWidget} for an example.
\row
\o QTableView \target qtableview-widget
\o Supports the \l{box model}. When
\l{QAbstractItemView::alternatingRowColors}{alternating row colors}
is enabled, the alternating colors can be styled using the
\l{#alternate-background-color-prop}{alternate-background-color}
property.
The color and background of the selected item is styled using
\l{#selection-color-prop}{selection-color} and
\l{#selection-background-color-prop}{selection-background-color}
respectively.
The corner widget in a QTableView is implemented as a QAbstractButton
and can be styled using the "QTableView QTableCornerButton::section"
selector.
\warning If you only set a background-color on a QTableCornerButton,
the background may not appear unless you set the border property to
some value. This is because, by default, the QTableCornerButton draws a
native border which completely overlaps the background-color.
The color of the grid can be specified using the
\l{#gridline-color-prop}{gridline-color} property.
See \l{qabstractscrollarea-widget}{QAbsractScrollArea} to
style scrollable backgrounds.
See \l{Qt Style Sheets Examples#Customizing QTableView}
{Customzing QTableView} for an example.
\row
\o QTableWidget \target qtablewidget-widget
\o See \l{#qtableview-widget}{QTableView}.
\row
\o QTextEdit \target qtextedit-widget
\o Supports the \l{box model}.
The color and background of selected text is styled using
\l{#selection-color-prop}{selection-color} and
\l{#selection-background-color-prop}{selection-background-color}
respectively.
See \l{qabstractscrollarea-widget}{QAbsractScrollArea} to
style scrollable backgrounds.
\row
\o QTimeEdit \target qtimeedit-widget
\o See \l{#qspinbox-widget}{QSpinBox}.
\row
\o QToolBar \target qtoolbar-widget
\o Supports the \l{box model}.
The \l{#top-ps}{:top}, \l{#left-ps}{:left}, \l{#right-ps}{:right},
\l{#bottom-ps}{:bottom} pseudo states depending on the area in
which the tool bar is grouped.
The \l{#first-ps}{:first}, \l{#last-ps}{:last}, \l{#middle-ps}{:middle},
\l{#only-one-ps}{:only-one} pseudo states indicator the position
of the tool bar within a line group (See
QStyleOptionToolBar::positionWithinLine).
The separator of a QToolBar is styled using the
\l{#separator-sub}{::separator} subcontrol.
The handle (to move the toolbar) is styled using the
\l{#handle-sub}{::handle} subcontrol.
See \l{Qt Style Sheets Examples#Customizing QToolBar}{Customizing QToolBar}
for an example.
\row
\o QToolButton \target qtoolbutton-widget
\o Supports the \l{box model}.
If the QToolButton has a menu, is
\l{#menu-indicator-sub}{::menu-indicator} subcontrol can be used to
style the indicator. By default, the menu-indicator is positioned
at the bottom right of the Padding rectangle of the widget.
If the QToolButton is in QToolButton::MenuButtonPopup mode,
the \l{#menu-button-sub}{::menu-button} subcontrol is used to draw the
menu button. \l{#menu-arrow-sub}{::menu-arrow} subcontrol is used to
draw the menu arrow inside the menu-button. By default, it is
positioned in the center of the Contents rectangle of the
menu-button subcontrol.
When the QToolButton displays arrows, the \l{#up-arrow-sub}{::up-arrow},
\l{#down-arrow-sub}{::down-arrow}, \l{#left-arrow-sub}{::left-arrow}
and \l{#right-arrow-sub}{::right-arrow} subcontrols are used.
\warning If you only set a background-color on a QToolButton, the background
will not appear unless you set the border property to some value. This is
because, by default, the QToolButton draws a native border which completely
overlaps the background-color. For example,
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 31
See \l{Qt Style Sheets Examples#Customizing QToolButton}{Customizing QToolButton}
for an example.
\row
\o QToolBox \target qtoolbox-widget
\o Supports the \l{box model}.
The individual tabs can by styled using the
\l{#tab-sub}{::tab} subcontrol. The tabs support the
\l{#only-one-ps}{:only-one}, \l{#first-ps}{:first},
\l{#last-ps}{:last}, \l{#middle-ps}{:middle},
\l{#previous-selected-ps}{:previous-selected},
\l{#next-selected-ps}{:next-selected},
\l{#selected-ps}{:selected} pseudo states.
\row
\o QToolTip \target qtooltip-widget
\o Supports the \l{box model}. The \l{#opacity-prop}{opacity}
property controls the opacity of the tooltip.
See \l{Qt Style Sheets Examples#Customizing QFrame}{Customizing QFrame}
for an example (a QToolTip is a QFrame).
\row
\o QTreeView \target qtreeview-widget
\o Supports the \l{box model}. When
\l{QAbstractItemView::alternatingRowColors}{alternating row colors}
is enabled, the alternating colors can be styled using the
\l{#alternate-background-color-prop}{alternate-background-color}
property.
The color and background of the selected item is styled using
\l{#selection-color-prop}{selection-color} and
\l{#selection-background-color-prop}{selection-background-color}
respectively.
The selection behavior is controlled by the
\l{#show-decoration-selected-prop}{show-decoration-selected} property.
The branches of the tree view can be styled using the
\l{#branch-sub}{::branch} subcontrol. The
::branch Sub-control supports the \l{open-ps}{:open},
\l{closed-ps}{:closed}, \l{has-siblings-ps}{:has-sibling} and
\l{has-children-ps}{:has-children} pseudo states.
Use the \l{#item-sub}{::item} subcontrol for more fine grained
control over the items in the QTreeView.
See \l{qabstractscrollarea-widget}{QAbsractScrollArea} to
style scrollable backgrounds.
See \l{Qt Style Sheets Examples#Customizing QTreeView}{Customizing QTreeView}
for an example to style the branches.
\row
\o QTreeWidget \target qtreewidget-widget
\o See \l{#qtreeview-widget}{QTreeView}.
\row
\o QWidget \target qwidget-widget
\o Supports only the \l{Qt Style Sheets Reference#background-prop}{background},
\l{#background-clip-prop}{background-clip} and
\l{#background-origin-prop}{background-origin} properties.
If you subclass from QWidget, you need to provide a paintEvent for your
custom QWidget as below:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 32
The above code is a no-operation if there is no stylesheet set.
\warning Make sure you define the Q_OBJECT macro for your custom
widget.
\endtable
\section1 List of Properties
The table below lists all the properties supported by Qt Style
Sheets. Which values can be given to an property depend on the
\l{List of Property Types}{property's type}. Unless otherwise
specified, properties below apply to all widgets. Properties
marked with an asterisk * are specific to Qt and have no equivalent
in CSS2 or CSS3.
\table 100%
\header
\o Property
\o Type
\o Description
\row
\o \bold{\c alternate-background-color} \target alternate-background-color-prop
\o \l{#Brush}{Brush} \BR
\o The \l{QAbstractItemView::alternatingRowColors}
{alternate background color} used in QAbstractItemView subclasses.
If this property is not set, the default value is
whatever is set for the palette's
\l{QPalette::}{AlternateBase} role.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 33
See also \l{Qt Style Sheets Reference#background-prop}{background} and
\l{#selection-background-color-prop}{selection-background-color}.
\row
\o \bold{\c background} \target background-prop
\o \l{#Background}{Background}
\o Shorthand notation for setting the background. Equivalent
to specifying \c background-color, \c background-image, \c
background-repeat, and/or \c background-position.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QDialog, QFrame, QGroupBox, QLabel, QLineEdit,
QMenu, QMenuBar, QPushButton, QRadioButton, QSplitter,
QTextEdit, QToolTip, and plain \l{QWidget}s.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 34
Often, it is required to set a fill pattern similar to the styles
in Qt::BrushStyle. You can use the background-color property for
Qt::SolidPattern, Qt::RadialGradientPattern, Qt::LinearGradientPattern
and Qt::ConicalGradientPattern. The other patterns are easily achieved
by creating a background image that contains the pattern.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 35
See also \l{#background-origin-prop}{background-origin},
\l{#selection-background-color-prop}{selection-background-color},
\l{#background-clip-prop}{background-clip},
\l{#background-attachment-prop}{background-attachment}
and \l{#alternate-background-color-prop}{alternate-background-color}.
\row
\o \c background-color \target background-color-prop
\o \l{#Brush}{Brush} \BR
\o The background color used for the widget.
Examples:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 36
\row
\o \c background-image \target background-image-prop
\o \l{#Url}{Url}
\o The background image used for the widget. Semi-transparent
parts of the image let the \c background-color shine
through.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 37
\row
\o \c background-repeat \target background-repeat-prop
\o \l{#Repeat}{Repeat}
\o Whether and how the background image is repeated to fill
the \c background-origin rectangle.
If this property is not specified, the background image
is repeated in both directions (\c repeat).
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 38
\row
\o \c background-position
\o \l{#Alignment}{Alignment}
\o The alignment of the background image within the \c
background-origin rectangle.
If this property is not specified, the alignment is \c
top \c left.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 39
\row
\o \bold{\c background-attachment} \target background-attachment-prop
\o \l{#Attachment}{Attachment}
\o Determines whether the background-image in a QAbstractScrollArea
is scrolled or fixed with respect to the viewport.
By default, the background-image scrolls with the viewport.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 40
See also \l{Qt Style Sheets Reference#background-prop}{background}
\row
\o \bold{\c background-clip} \target background-clip-prop
\o \l{#Origin}{Origin}
\o The widget's rectangle, in which the \c background is drawn.
This property specifies the rectangle to which the \c background-color
and \c background-image are clipped.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QDialog, QFrame, QGroupBox, QLabel,
QPushButton, QRadioButton, QSplitter, QTextEdit, QToolTip,
and plain \l{QWidget}s.
If this property is not specified, the default is \c
border.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 41
See also \l{Qt Style Sheets Reference#background-prop}{background},
\l{#background-origin-prop}{background-origin} and \l{The Box Model}.
\row
\o \bold{\c background-origin} \target background-origin-prop
\o \l{#Origin}{Origin}
\o The widget's background rectangle, to use in conjunction
with \c background-position and \c background-image.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QDialog, QFrame, QGroupBox, QLabel,
QPushButton, QRadioButton, QSplitter, QTextEdit, QToolTip,
and plain \l{QWidget}s.
If this property is not specified, the default is \c
padding.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 42
See also \l{Qt Style Sheets Reference#background-prop}{background} and
\l{The Box Model}.
\row
\o \bold{\c border} \target border-prop
\o \l{#Border}{Border}
\o Shorthand notation for setting the widget's border. Equivalent
to specifying \c border-color, \c border-style, and/or
\c border-width.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QFrame, QGroupBox, QLabel, QLineEdit,
QMenu, QMenuBar, QPushButton, QRadioButton, QSplitter,
QTextEdit, QToolTip, and plain \l{QWidget}s.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 43
\row
\o \c border-top
\o \l{#Border}{Border}
\o Shorthand notation for setting the widget's top border.
Equivalent to specifying \c border-top-color, \c
border-top-style, and/or \c border-top-width.
\row
\o \c border-right
\o \l{#Border}{Border}
\o Shorthand notation for setting the widget's right border.
Equivalent to specifying \c border-right-color, \c
border-right-style, and/or \c border-right-width.
\row
\o \c border-bottom
\o \l{#Border}{Border}
\o Shorthand notation for setting the widget's bottom border.
Equivalent to specifying \c border-bottom-color, \c
border-bottom-style, and/or \c border-bottom-width.
\row
\o \c border-left
\o \l{#Border}{Border}
\o Shorthand notation for setting the widget's left border.
Equivalent to specifying \c border-left-color, \c
border-left-style, and/or \c border-left-width.
\row
\o \bold{\c border-color} \target border-attrs
\target border-color-prop
\o \l{#Box Colors}{Box Colors}
\o The color of all the border's edges. Equivalent to
specifying \c border-top-color, \c border-right-color, \c
border-bottom-color, and \c border-left-color.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QFrame, QGroupBox, QLabel, QLineEdit,
QMenu, QMenuBar, QPushButton, QRadioButton, QSplitter,
QTextEdit, QToolTip, and plain \l{QWidget}s.
If this property is not specified, it defaults to
\l{#color-prop}{color} (i.e., the widget's foreground
color).
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 44
See also \l{Qt Style Sheets Reference#border-style-prop}{border-style},
\l{Qt Style Sheets Reference#border-width-prop}{border-width},
\l{#border-image-prop}{border-image}, and \l{The Box Model}.
\row
\o \c border-top-color
\o \l{#Brush}{Brush} \BR
\o The color of the border's top edge.
\row
\o \c border-right-color
\o \l{#Brush}{Brush} \BR
\o The color of the border's right edge.
\row
\o \c border-bottom-color
\o \l{#Brush}{Brush} \BR
\o The color of the border's bottom edge.
\row
\o \c border-left-color
\o \l{#Brush}{Brush} \BR
\o The color of the border's left edge.
\row
\o \bold{\c border-image} \target border-image-prop
\o \l{#Border Image}{Border Image}
\o The image used to fill the border. The image is cut into
nine parts and stretched appropriately if necessary. See
\l{#Border Image}{Border Image} for details.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QFrame, QGroupBox, QLabel, QLineEdit,
QMenu, QMenuBar, QPushButton, QRadioButton, QSplitter,
QTextEdit and QToolTip.
See also \l{#border-color-prop}{border-color},
\l{Qt Style Sheets Reference#border-style-prop}{border-style},
\l{Qt Style Sheets Reference#border-width-prop}{border-width}, and
\l{The Box Model}.
\row
\o \bold{\c border-radius} \target border-radius-prop
\o \l{#Radius}{Radius}
\o The radius of the border's corners. Equivalent to
specifying \c border-top-left-radius, \c
border-top-right-radius, \c border-bottom-right-radius,
and \c border-bottom-left-radius.
The border-radius clips the element's
\l{Qt Style Sheets Reference#background-prop}{background}.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit,
and QToolTip.
If this property is not specified, it defaults to 0.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 45
See also \l{Qt Style Sheets Reference#border-width-prop}{border-width} and
\l{The Box Model}.
\row
\o \c border-top-left-radius
\o \l{#Radius}{Radius}
\o The radius of the border's top-left corner.
\row
\o \c border-top-right-radius
\o \l{#Radius}{Radius}
\o The radius of the border's top-right corner.
\row
\o \c border-bottom-right-radius
\o \l{#Radius}{Radius}
\o The radius of the border's bottom-right corner. Setting
this property to a positive value results in a rounded
corner.
\row
\o \c border-bottom-left-radius
\o \l{#Radius}{Radius}
\o The radius of the border's bottom-left corner. Setting this
property to a positive value results in a rounded corner.
\row
\o \bold{\c border-style} \target border-style-prop
\o \l {Border Style}
\o The style of all the border's edges.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit,
and QToolTip.
If this property is not specified, it defaults to \c none.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 46
See also \l{#border-color-prop}{border-color},
\l{Qt Style Sheets Reference#border-style-prop}{border-style},
\l{#border-image-prop}{border-image}, and \l{The Box Model}.
\row
\o \c border-top-style
\o \l{#Border Style}{Border Style}
\o The style of the border's top edge.
\row
\o \c border-right-style
\o \l{#Border Style}{Border Style}
\o The style of the border's right edge/
\row
\o \c border-bottom-style
\o \l{#Border Style}{Border Style}
\o The style of the border's bottom edge.
\row
\o \c border-left-style
\o \l{#Border Style}{Border Style}
\o The style of the border's left edge.
\row
\o \bold{\c border-width} \target border-width-prop
\o \l{#Box Lengths}{Box Lengths}
\o The width of the border. Equivalent to setting \c
border-top-width, \c border-right-width, \c
border-bottom-width, and \c border-left-width.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit,
and QToolTip.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 47
See also \l{#border-color-prop}{border-color},
\l{#border-radius-prop}{border-radius},
\l{Qt Style Sheets Reference#border-style-prop}{border-style},
\l{#border-image-prop}{border-image}, and
\l{The Box Model}.
\row
\o \c border-top-width
\o \l{#Length}{Length}
\o The width of the border's top edge.
\row
\o \c border-right-width
\o \l{#Length}{Length}
\o The width of the border's right edge.
\row
\o \c border-bottom-width
\o \l{#Length}{Length}
\o The width of the border's bottom edge.
\row
\o \c border-left-width
\o \l{#Length}{Length}
\o The width of the border's left edge.
\row
\o \bold{\c bottom} \target bottom-prop
\o \l{#Length}{Length}
\o If \l{#position-prop}{position} is \c relative (the
default), moves a \l{subcontrol} by a certain offset up;
specifying \tt{bottom: \e{y}} is then equivalent to
specifying \tt{\l{Qt Style Sheets Reference#top-prop}{top}: -\e{y}}.
If \l{#position-prop}{position} is \c absolute, the \c
bottom property specifies the subcontrol's bottom edge
in relation to the parent's bottom edge (see also
\l{Qt Style Sheets Reference#subcontrol-origin-prop}
{subcontrol-origin}).
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 48
See also \l{Qt Style Sheets Reference#left-prop}{left}, \l{#right-prop}{right}, and
\l{Qt Style Sheets Reference#top-prop}{top}.
\row
\o \bold{\c button-layout} \target button-layout-prop
\o \l{#Number}{Number}
\o The layout of buttons in a QDialogButtonBox or
a QMessageBox. The possible values are 0
(\l{QDialogButtonBox::}{WinLayout}), 1
(\l{QDialogButtonBox::}{MacLayout}), 2
(\l{QDialogButtonBox::}{KdeLayout}), and 3
(\l{QDialogButtonBox::}{GnomeLayout}).
If this property is not specified, it defaults to the
value specified by the current style for the
\l{QStyle::}{SH_DialogButtonLayout} style hint.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 49
\row
\o \bold{\c color} \target color-prop
\o \l{#Brush}{Brush} \BR
\o The color used to render text.
This property is supported by all widgets that respect
the \l QWidget::palette.
If this property is not set, the default is whatever is
set for in the widget's palette for the
QWidget::foregroundRole (typically black).
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 50
See also \l{Qt Style Sheets Reference#background-prop}{background} and
\l{#selection-color-prop}{selection-color}.
\row
\o \bold{\c dialogbuttonbox-buttons-have-icons}
\o \l{#Boolean}{Boolean}
\o Whether the buttons in a QDialogButtonBox show icons
If this property is set to 1, the buttons of a QDialogButtonBox
show icons; if it is set to 0, the icons are not shown.
See the \l{Qt Style Sheets Reference#list of icons}{List of Icons}
section for information on how to set icons.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 51
\note Styles defining this property must be applied before the
QDialogButtonBox is created; this means that you must apply the
style to the parent widget or to the application itself.
\omit
\row
\o \bold{\c etch-disabled-text}*
\o \l{#Boolean}{Boolean}
\o Whether disabled text is drawn etched.
If this property is not specified, it defaults to the
value specified by the current style for the
\l{QStyle::}{SH_EtchDisabledText} style hint.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 52
\endomit
\row
\o \bold{\c font} \target font-prop
\o \l{#Font}{Font}
\o Shorthand notation for setting the text's font. Equivalent
to specifying \c font-family, \c font-size, \c font-style,
and/or \c font-weight.
This property is supported by all widgets that respect
the \l QWidget::font.
If this property is not set, the default is the
QWidget::font.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 53
\row
\o \c font-family
\o String
\o The font family.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 54
\row
\o \c font-size
\o \l{#Font Size}{Font Size}
\o The font size. In this version of Qt, only pt and px metrics are
supported.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 55
\row
\o \c font-style
\o \l {Font Style}
\o The font style.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 56
\row
\o \c font-weight
\o \l{#Font Weight}{Font Weight}
\o The weight of the font.
\row
\o \bold{\c gridline-color}* \target gridline-color-prop
\o \l{#Color}{Color} \BR
\o The color of the grid line in a QTableView.
If this property is not specified, it defaults to the
value specified by the current style for the
\l{QStyle::}{SH_Table_GridLineColor} style hint.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 57
\row
\o \bold{\c height} \target height-prop
\o \l{#Length}{Length}
\o The height of a \l{subcontrol} (or in some case, a widget).
If this property is not specified, it defaults to a value
that depends on the subcontrol/widget and on the current style.
\warning Unless otherwise specified, this property has no effect
when set on widgets. If you want a widget with a fixed height, set
the \l{#min-width-prop}{min-height} and
\l{#max-width-prop}{max-height} to the same value.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 58
See also \l{#width-prop}{width}.
\row
\o \bold{\c icon-size} \target icon-size-prop
\o \l{#Length}{Length}
\o The width and height of the icon in a widget.
The icon size of the following widgets can be set using this
property.
\list
\i QCheckBox
\i QListView
\i QPushButton
\i QRadioButton
\i QTabBar
\i QToolBar
\i QToolBox
\i QTreeView
\endlist
\row
\o \bold{\c image}* \target image-prop
\o \l{#Url}{Url}+
\o The image that is drawn in the contents rectangle of a
\l{subcontrol}.
The image property accepts a list of \l{#Url}{Url}s or
an \c{svg}. The actual image that is drawn is determined
using the same algorithm as QIcon (i.e) the image is never scaled
up but always scaled down if necessary. If a \c{svg} is specified,
the image is scaled to the size of the contents rectangle.
Setting the image property on sub controls implicitly sets the
width and height of the sub-control (unless the image in a SVG).
In Qt 4.3 and later, the alignment of the
image within the rectangle can be specified using
\l{image-position-prop}{image-position}.
This property is for \l{subcontrol}s only--we don't support it for
other elements.
\warning The QIcon SVG plugin is needed to render SVG images.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 59
\row
\o \bold{\c image-position} \target image-position-prop
\o \l{#Alignment}{alignment}
\o In Qt 4.3 and later, the alignment of the image image's position can be specified
using relative or absolute position.
\row
\o \bold{\c left} \target left-prop
\o \l{#Length}{Length}
\o If \l{#position-prop}{position} is \c relative (the
default), moves a \l{subcontrol} by a certain offset to
the right.
If \l{#position-prop}{position} is \c absolute, the \c
left property specifies the subcontrol's left edge in
relation to the parent's left edge (see also
\l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}).
If this property is not specified, it defaults to \c 0.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 60
See also \l{#right-prop}{right}, \l{Qt Style Sheets Reference#top-prop}{top}, and
\l{#bottom-prop}{bottom}.
\row
\o \bold{\c lineedit-password- \BR \c character}* \target lineedit-password-character-prop
\o \l{#Number}{Number}
\o The QLineEdit password character as a Unicode number.
If this property is not specified, it defaults to the
value specified by the current style for the
\l{QStyle::}{SH_LineEdit_PasswordCharacter} style hint.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 61
\row
\o \bold{\c margin} \target margin-prop
\o \l {Box Lengths}
\o The widget's margins. Equivalent to specifying \c
margin-top, \c margin-right, \c margin-bottom, and \c
margin-left.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit,
and QToolTip.
If this property is not specified, it defaults to \c 0.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 62
See also \l{Qt Style Sheets Reference#padding-prop}{padding},
\l{#spacing-prop}{spacing}, and \l{The Box Model}.
\row
\o \c margin-top
\o \l{#Length}{Length}
\o The widget's top margin.
\row
\o \c margin-right
\o \l{#Length}{Length}
\o The widget's right margin.
\row
\o \c margin-bottom
\o \l{#Length}{Length}
\o The widget's bottom margin.
\row
\o \c margin-left
\o \l{#Length}{Length}
\o The widget's left margin.
\row
\o \bold{\c max-height} \target max-height-prop
\o \l{#Length}{Length}
\o The widget's or a subcontrol's maximum height.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
QMenuBar, QPushButton, QRadioButton, QSizeGrip, QSpinBox,
QSplitter, QStatusBar, QTextEdit, and QToolTip.
The value is relative to the contents rect in the \l{The
Box Model}{box model}.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 63
See also \l{#max-width-prop}{max-width}.
\row
\o \bold{\c max-width} \target max-width-prop
\o \l{#Length}{Length}
\o The widget's or a subcontrol's maximum width.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
QMenuBar, QPushButton, QRadioButton, QSizeGrip, QSpinBox,
QSplitter, QStatusBar, QTextEdit, and QToolTip.
The value is relative to the contents rect in the \l{The
Box Model}{box model}.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 64
See also \l{#max-height-prop}{max-height}.
\row
\o \bold{\c messagebox-text- \target messagebox-text-interaction-flags-prop
\BR \c interaction-flags}*
\o \l{#Number}{Number}
\o The interaction behavior for text in a message box.
Possible values are based on Qt::TextInteractionFlags.
If this property is not specified, it defaults to the
value specified by the current style for the
\l{QStyle::}{SH_MessageBox_TextInteractionFlags} style
hint.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 65
\row
\o \bold{\c min-height} \target min-height-prop
\o \l{#Length}{Length}
\o The widget's or a subcontrol's minimum height.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
QMenuBar, QPushButton, QRadioButton, QSizeGrip, QSpinBox,
QSplitter, QStatusBar, QTextEdit, and QToolTip.
If this property is not specified, the minimum height is
derived based on the widget's contents and the style.
The value is relative to the contents rect in the \l{The
Box Model}{box model}.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 66
See also \l{#min-width-prop}{min-width}.
\row
\o \bold{\c min-width} \target min-width-prop
\o \l{#Length}{Length}
\o The widget's or a subcontrol's minimum width.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
QMenuBar, QPushButton, QRadioButton, QSizeGrip, QSpinBox,
QSplitter, QStatusBar, QTextEdit, and QToolTip.
If this property is not specified, the minimum width is
derived based on the widget's contents and the style.
The value is relative to the contents rect in the \l{The
Box Model}{box model}.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 67
See also \l{#min-height-prop}{min-height}.
\row
\o \bold{\c opacity}* \target opacity-prop
\o \l{#Number}{Number}
\o The opacity for a widget. Possible values are from 0
(transparent) to 255 (opaque). For the moment, this is
only supported for \l{QToolTip}{tooltips}.
If this property is not specified, it defaults to the
value specified by the current style for the
\l{QStyle::}{SH_ToolTipLabel_Opacity} style hint.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 68
\row
\o \bold{\c padding} \target padding-prop
\o \l{#Box Lengths}{Box Lengths}
\o The widget's padding. Equivalent to specifying \c
padding-top, \c padding-right, \c padding-bottom, and \c
padding-left.
This property is supported by QAbstractItemView
subclasses, QAbstractSpinBox subclasses, QCheckBox,
QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu,
QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit,
and QToolTip.
If this property is not specified, it defaults to \c 0.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 69
See also \l{#margin-prop}{margin},
\l{#spacing-prop}{spacing}, and \l{The Box Model}.
\row
\o \c padding-top
\o \l{#Length}{Length}
\o The widget's top padding.
\row
\o \c padding-right
\o \l{#Length}{Length}
\o The widget's right padding.
\row
\o \c padding-bottom
\o \l{#Length}{Length}
\o The widget's bottom padding.
\row
\o \c padding-left
\o \l{#Length}{Length}
\o The widget's left padding.
\row
\o \bold{\c paint-alternating-row-colors-for-empty-area}
\target paint-alternating-row-colors-for-empty-area-prop
\o \c bool
\o Whether the QTreeView paints alternating row colors for the empty
area (i.e the area where there are no items)
\row
\o \bold{\c position} \target position-prop
\o \c relative \BR
| \c absolute
\o Whether offsets specified using \l{Qt Style Sheets Reference#left-prop}{left},
\l{#right-prop}{right}, \l{Qt Style Sheets Reference#top-prop}{top}, and
\l{#bottom-prop}{bottom} are relative or absolute
coordinates.
If this property is not specified, it defaults to \c
relative.
\row
\o \bold{\c right} \target right-prop
\o \l{#Length}{Length}
\o If \l{#position-prop}{position} is \c relative (the
default), moves a \l{subcontrol} by a certain offset to
the left; specifying \tt{right: \e{x}} is then equivalent
to specifying \tt{\l{Qt Style Sheets Reference#left-prop}{left}: -\e{x}}.
If \l{#position-prop}{position} is \c absolute, the \c
right property specifies the subcontrol's right edge in
relation to the parent's right edge (see also
\l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}).
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 70
See also \l{Qt Style Sheets Reference#left-prop}{left}, \l{Qt Style Sheets Reference#top-prop}{top}, and
\l{#bottom-prop}{bottom}.
\row
\o \bold{\c selection-background-color}* \target selection-background-color-prop
\o \l{#Brush}{Brush} \BR
\o The background of selected text or items.
This property is supported by all widgets that respect
the \l QWidget::palette and that show selection text.
If this property is not set, the default value is
whatever is set for the palette's
\l{QPalette::}{Highlight} role.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 71
See also \l{#selection-color-prop}{selection-color} and
\l{Qt Style Sheets Reference#background-prop}{background}.
\row
\o \bold{\c selection-color}* \target selection-color-prop
\o \l{#Brush}{Brush} \BR
\o The foreground of selected text or items.
This property is supported by all widgets that respect
the \l QWidget::palette and that show selection text.
If this property is not set, the default value is
whatever is set for the palette's
\l{QPalette::}{HighlightedText} role.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 72
See also
\l{#selection-background-color-prop}{selection-background-color}
and \l{#color-prop}{color}.
\row
\o \bold{\c show-decoration- \target show-decoration-selected-prop
\BR \c selected}*
\o \l{#Boolean}{Boolean}
\o Controls whether selections in a QListView cover the
entire row or just the extent of the text.
If this property is not specified, it defaults to the
value specified by the current style for the
\l{QStyle::}{SH_ItemView_ShowDecorationSelected} style
hint.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 73
\row
\o \bold{\c spacing}* \target spacing-prop
\o \l{#Length}{Length}
\o Internal spacing in the widget.
This property is supported by QCheckBox, checkable
\l{QGroupBox}es, QMenuBar, and QRadioButton.
If this property is not specified, the default value
depends on the widget and on the current style.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 74
See also \l{Qt Style Sheets Reference#padding-prop}{padding} and
\l{#margin-prop}{margin}.
\row
\o \bold{\c subcontrol-origin}* \target subcontrol-origin-prop
\o \l{#Origin}{Origin}
\o The origin rectangle of the \l subcontrol within the
parent element.
If this property is not specified, the default is \c
padding.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 75
See also
\l{Qt Style Sheets Reference#subcontrol-position-prop}{subcontrol-position}.
\row
\o \bold{\c subcontrol-position}* \target subcontrol-position-prop
\o \l{#Alignment}{Alignment}
\o The alignment of the \l subcontrol within the origin
rectangle specified by \l{Qt Style Sheets Reference#subcontrol-origin-prop}
{subcontrol-origin}.
If this property is not specified, it defaults to a value
that depends on the subcontrol.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 76
See also
\l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}.
\row
\o \bold{\c text-align} \target text-align-prop
\o \l{#Alignment}{Alignment}
\o The alignment of text and icon within the contents of the widget.
If this value is not specified, it defaults to the value
that depends on the native style.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 77
This property is currently supported only by QPushButton
and QProgressBar.
\row
\o \bold{\c text-decoration}
\o \c none \BR
\c underline \BR
\c overline \BR
\c line-through
\o Additional text effects
\row
\o \bold{\c top} \target top-prop
\o \l{#Length}{Length}
\o If \l{#position-prop}{position} is \c relative (the
default), moves a \l{subcontrol} by a certain offset
down.
If \l{#position-prop}{position} is \c absolute, the \c top
property specifies the subcontrol's top edge in relation
to the parent's top edge (see also
\l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}).
If this property is not specified, it defaults to \c 0.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 78
See also \l{Qt Style Sheets Reference#left-prop}{left}, \l{#right-prop}{right}, and
\l{#bottom-prop}{bottom}.
\row
\o \bold{\c width} \target width-prop
\o \l{#Length}{Length}
\o The width of a \l{subcontrol} (or a widget in some cases).
If this property is not specified, it defaults to a value
that depends on the subcontrol/widget and on the current style.
\warning Unless otherwise specified, this property has no effect
when set on widgets. If you want a widget with a fixed width, set
the \l{#min-width-prop}{min-width} and
\l{#max-width-prop}{max-width} to the same value.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 79
See also \l{#height-prop}{height}.
\endtable
\target list of icons
\section1 List of Icons
Icons used in Qt can be customized using the following properties. Each of
the properties listed in this section have the type \l{#Icon}{Icon}.
Note that for icons to appear in buttons in a QDialogButtonBox, you need to
set the dialogbuttonbox-buttons-have-icons property to true. Also, to
customize the size of the icons, use the icon-size property.
\table 100%
\header
\o Name
\o QStyle::StandardPixmap
\row
\o backward-icon
\o QStyle::SP_ArrowBack
\row
\o cd-icon
\o QStyle::SP_DriveCDIcon
\row
\o computer-icon
\o QStyle::SP_ComputerIcon
\row
\o desktop-icon
\o QStyle::SP_DesktopIcon
\row
\o dialog-apply-icon
\o QStyle::SP_DialogApplyButton
\row
\o dialog-cancel-icon
\o QStyle::SP_DialogCancelButton
\row
\o dialog-close-icon
\o QStyle::SP_DialogCloseButton
\row
\o dialog-discard-icon
\o QStyle::SP_DialogDiscardButton
\row
\o dialog-help-icon
\o QStyle::SP_DialogHelpButton
\row
\o dialog-no-icon
\o QStyle::SP_DialogNoButton
\row
\o dialog-ok-icon
\o QStyle::SP_DialogOkButton
\row
\o dialog-open-icon
\o QStyle::SP_DialogOpenButton
\row
\o dialog-reset-icon
\o QStyle::SP_DialogResetButton
\row
\o dialog-save-icon
\o QStyle::SP_DialogSaveButton
\row
\o dialog-yes-icon
\o QStyle::SP_DialogYesButton
\row
\o directory-closed-icon
\o QStyle::SP_DirClosedIcon
\row
\o directory-icon
\o QStyle::SP_DirIcon
\row
\o directory-link-icon
\o QStyle::SP_DirLinkIcon
\row
\o directory-open-icon
\o QStyle::SP_DirOpenIcon
\row
\o dockwidget-close-icon
\o QStyle::SP_DockWidgetCloseButton
\row
\o downarrow-icon
\o QStyle::SP_ArrowDown
\row
\o dvd-icon
\o QStyle::SP_DriveDVDIcon
\row
\o file-icon
\o QStyle::SP_FileIcon
\row
\o file-link-icon
\o QStyle::SP_FileLinkIcon
\omit
\row
\o filedialog-backward-icon
\o QStyle::SP_FileDialogBack
\endomit
\row
\o filedialog-contentsview-icon
\o QStyle::SP_FileDialogContentsView
\row
\o filedialog-detailedview-icon
\o QStyle::SP_FileDialogDetailedView
\row
\o filedialog-end-icon
\o QStyle::SP_FileDialogEnd
\row
\o filedialog-infoview-icon
\o QStyle::SP_FileDialogInfoView
\row
\o filedialog-listview-icon
\o QStyle::SP_FileDialogListView
\row
\o filedialog-new-directory-icon
\o QStyle::SP_FileDialogNewFolder
\row
\o filedialog-parent-directory-icon
\o QStyle::SP_FileDialogToParent
\row
\o filedialog-start-icon
\o QStyle::SP_FileDialogStart
\row
\o floppy-icon
\o QStyle::SP_DriveFDIcon
\row
\o forward-icon
\o QStyle::SP_ArrowForward
\row
\o harddisk-icon
\o QStyle::SP_DriveHDIcon
\row
\o home-icon
\o QStyle::SP_DirHomeIcon
\row
\o leftarrow-icon
\o QStyle::SP_ArrowLeft
\row
\o messagebox-critical-icon
\o QStyle::SP_MessageBoxCritical
\row
\o messagebox-information-icon
\o QStyle::SP_MessageBoxInformation
\row
\o messagebox-question-icon
\o QStyle::SP_MessageBoxQuestion
\row
\o messagebox-warning-icon
\o QStyle::SP_MessageBoxWarning
\row
\o network-icon
\o QStyle::SP_DriveNetIcon
\row
\o rightarrow-icon
\o QStyle::SP_ArrowRight
\row
\o titlebar-contexthelp-icon
\o QStyle::SP_TitleBarContextHelpButton
\row
\o titlebar-maximize-icon
\o QStyle::SP_TitleBarMaxButton
\row
\o titlebar-menu-icon
\o QStyle::SP_TitleBarMenuButton
\row
\o titlebar-minimize-icon
\o QStyle::SP_TitleBarMinButton
\row
\o titlebar-normal-icon
\o QStyle::SP_TitleBarNormalButton
\row
\o titlebar-shade-icon
\o QStyle::SP_TitleBarShadeButton
\row
\o titlebar-unshade-icon
\o QStyle::SP_TitleBarUnshadeButton
\row
\o trash-icon
\o QStyle::SP_TrashIcon
\row
\o uparrow-icon
\o QStyle::SP_ArrowUp
\endtable
\section1 List of Property Types
The following table summarizes the syntax and meaning of the
different property types.
\table 100%
\header
\o Type
\o Syntax
\o Description
\row
\o \bold Alignment \target Alignment
\o \{ \c top \BR
| \c bottom \BR
| \c left \BR
| \c right \BR
| \c center \}*
\o Horizontal and/or vertical alignment.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 80
\row
\o \bold Attachment \target Attachment
\o \{ \c scroll \BR
| \c fixed \}*
\o Scroll or fixed attachment.
\row
\o \bold Background \target Background
\o \{ \l{#Brush}{Brush} \BR
| \l{#Url}{Url} \BR
| \l{#Repeat}{Repeat} \BR
| \l{#Alignment}{Alignment} \}*
\o A sequence of \l{#Brush}{Brush}, \l{#Url}{Url},
\l{#Repeat}{Repeat}, and \l{#Alignment}{Alignment}.
\row
\o \bold Boolean \target Boolean
\o 0 | 1
\o True (\c 1) or false (\c 0).
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 81
\row
\o \bold Border \target Border
\o \{ \l{#Border Style}{Border Style} \BR
| \l{#Length}{Length} \BR
| \l{#Brush}{Brush} \}*
\o Shorthand border property.
\row
\o \bold{Border \target Border Image
Image}
\o \c none \BR
| \l{Url} \l{Number}\{4\} \BR (\c stretch | \c repeat){0,2}
\o A border image is an image that is composed of nine parts
(top left, top center, top right, center left, center,
center right, bottom left, bottom center, and bottom
right). When a border of a certain size is required, the
corner parts are used as is, and the top, right, bottom,
and left parts are stretched or repeated to produce a
border with the desired size.
See the
\l{http://www.w3.org/TR/css3-background/#the-border-image}
{CSS3 Draft Specification} for details.
\row
\o \bold{Border \target Border Style
Style}
\o \c dashed \BR
| \c dot-dash \BR
| \c dot-dot-dash \BR
| \c dotted \BR
| \c double \BR
| \c groove \BR
| \c inset \BR
| \c outset \BR
| \c ridge \BR
| \c solid \BR
| \c none
\o Specifies the pattern used to draw a border.
See the \l{http://www.w3.org/TR/css3-background/#border-style}
{CSS3 Draft Specification} for details.
\row
\o \bold{Box \target Box Colors
Colors}
\o \l{#Brush}{Brush}\{1,4\}
\o One to four occurrences of \l{#Brush}{Brush}, specifying the top,
right, bottom, and left edges of a box, respectively. If
the left color is not specified, it is taken to be the
same as the right color. If the bottom color is not
specified, it is taken to be the same as the top color. If
the right color is not specified, it is taken to be the
same as the top color.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 82
\row
\o \bold{Box \target Box Lengths
Lengths}
\o \l{#Length}{Length}\{1,4\}
\o One to four occurrences of \l{#Length}{Length}, specifying the
top, right, bottom, and left edges of a box,
respectively. If the left length is not specified, it is
taken to be the same as the right length. If the bottom
length is not specified, is it taken to be the same as the
top length. If the right length is not specified, it is
taken to be the same as the top length.
Examples:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 83
\row
\o \bold Brush \target Brush
\o \l{#Color}{Color} \BR
| \l{Gradient} \BR
| \l{PaletteRole}
\o Specifies a Color or a Gradient or an entry in the Palette.
\row
\o \bold Color \target Color
\o \tt{rgb(\e{r}, \e{g}, \e{b})} \BR
| \tt{rgba(\e{r}, \e{g}, \e{b}, \e{a})} \BR
| \tt{hsv(\e{h}, \e{s}, \e{v})} \BR
| \tt{hsva(\e{h}, \e{s}, \e{v}, \e{a})} \BR
| \tt{#\e{rrggbb}} \BR
| \l{QColor::setNamedColor()}{Color Name} \BR
\o Specifies a color as RGB (red, green, blue) or RGBA
(red, green, blue, alpha) or HSV (hue, saturation, value) or HSVA
(hue, saturation, value, alpha) or a named color. The \c rgb() or \c rgba()
syntax can be used with integer values between 0 and 255, or with
percentages. The value of s, v, and a in \c hsv() or \c hsva() must all
be in the range 0-255; the value of h must be in the range 0-359.
Examples:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 84
\note The RGB colors allowed are the same as those allowed with
CSS 2.1, as listed
\l{http://www.w3.org/TR/CSS21/syndata.html#color-units}{here}.
\row
\o \bold Font \target Font
\o (\l{#Font Style}{Font Style} | \l{#Font Weight}{Font Weight}){0,2} \l{#Font Size}{Font Size} String
\o Shorthand font property.
\row
\o \bold{Font \target Font Size
Size}
\o \l{Length}
\o The size of a font.
\row
\o \bold{Font \target Font Style
Style}
\o \c normal \BR
| \c italic \BR
| \c oblique
\o The style of a font.
\row
\o \bold{Font \target Font Weight
Weight}
\o \c normal \BR
| \c bold \BR
| \c 100 \BR
| \c 200 \BR
... \BR
| \c 900
\o The weight of a font.
\row
\o \bold Gradient \target Gradient
\o \c qlineargradient \BR
| \c qradialgradient \BR
| \c qconicalgradient
\o Specifies gradient fills. There are three types of gradient fills:
\list
\o \e{Linear} gradients interpolate colors between start and
end points.
\o \e{Radial} gradients interpolate colors between a focal
point and end points on a circle surrounding it.
\o \e{Conical} gradients interpolate colors around a center
point.
\endlist
Gradients are specified in Object Bounding Mode. Imagine the box
in which the gradient is rendered, to have its top left corner at (0, 0)
and its bottom right corner at (1, 1). Gradient parameters are
then specified as percentages from 0 to 1. These values are
extrapolated to actual box coordinates at runtime. It is possible
specify values that lie outside the bounding box (-0.6 or 1.8, for
instance).
\warning The stops have to appear sorted in ascending order.
Examples:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 85
\row
\o \bold Icon \target Icon
\o (\l{#Url}{Url} (\c disabled | \c active | \c normal | \c selected)?
(\c on | \c off)? )*
\o A list of url, QIcon::Mode and QIcon::State.
Example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 86
\row
\o \bold Length \target Length
\o \l{#Number}{Number} (\c px | \c pt | \c em | \c ex)?
\o A number followed by a measurement unit. The CSS standard recommends
that user agents must
\l{http://www.w3.org/TR/CSS21/syndata.html#illegalvalues}{ignore}
a declaration with an illegal value. In Qt, it is mandatory to
specify measurement units. For compatibility with earlier versions
of Qt, numbers without measurement units are treated as pixels
in most contexts. The supported units are:
\list
\o \c px: pixels
\o \c pt: the size of one point (i.e., 1/72 of an inch)
\o \c em: the em width of the font (i.e., the width of 'M')
\o \c ex: the ex width of the font (i.e., the height of 'x')
\endlist
\row
\o \bold Number \target Number
\o A decimal integer or a real number
\o Examples: \c 0, \c 18, \c +127, \c -255, \c 12.34, \c -.5,
\c 0009.
\row
\o \bold Origin \target Origin
\o \c margin \BR
| \c border \BR
| \c padding \BR
| \c content
\o Indicates which of four rectangles to use.
\list
\o \c margin: The margin rectangle. The margin falls outside the border.
\o \c border: The border rectangle. This is where any border is drawn.
\o \c padding: The padding rectangle. Unlike the margins,
padding is located inside the border.
\o \c content: The content rectangle. This specifies where
the actual contents go, excluding any
padding, border, or margin.
\endlist
See also \l{The Box Model}.
\row
\o \bold PaletteRole \target PaletteRole
\o \c alternate-base \BR
| \c base \BR
| \c bright-text \BR
| \c button \BR
| \c button-text \BR
| \c dark \BR
| \c highlight \BR
| \c highlighted-text \BR
| \c light \BR
| \c link \BR
| \c link-visited \BR
| \c mid \BR
| \c midlight \BR
| \c shadow \BR
| \c text \BR
| \c window \BR
| \c window-text \BR
\o These values correspond the \l{QPalette::ColorRole}{Color roles}
in the widget's QPalette.
For example,
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 87
\row
\o \bold Radius \target Radius
\o \l{#Length}{Length}\{1, 2\}
\o One or two occurrences of \l{#Length}{Length}. If only one length is
specified, it is used as the radius of the quarter circle
defining the corner. If two lengths are specified, the
first length is the horizontal radius of a quarter
ellipse, whereas the second length is the vertical radius.
\row
\o \bold Repeat \target Repeat
\o \c repeat-x \BR
| \c repeat-y \BR
| \c repeat \BR
| \c no-repeat
\o A value indicating the nature of repetition.
\list
\o \c repeat-x: Repeat horizontally.
\o \c repeat-y: Repeat vertically.
\o \c repeat: Repeat horizontally and vertically.
\o \c no-repeat: Don't repeat.
\endlist
\row
\o \bold Url \target Url
\o \tt{url(\e{filename})}
\o \tt{\e{filename}} is the name of a file on the local disk
or stored using \l{the Qt Resource System}. Setting an
image implicitly sets the width and height of the element.
\endtable
\section1 List of Pseudo-States
The following pseudo-states are supported:
\table 100%
\header
\o Pseudo-State
\o Description
\row \o \c :active \target active
\o This state is set when the widget resides in an active window.
\row
\o \c :adjoins-item \target adjoins-item-ps
\o This state is set when the \l{#branch-sub}{::branch} of a QTreeView
is adjacent to an item.
\row
\o \c :alternate \target alternate-ps
\o This state is set for every alternate row whe painting the row of
a QAbstractItemView when QAbstractItemView::alternatingRowColors()
is set to true.
\row
\o \c :bottom \target bottom-ps
\o The item is positioned at the bottom. For example, a QTabBar
that has its tabs positioned at the bottom.
\row
\o \c :checked \target checked-ps
\o The item is checked. For example, the
\l{QAbstractButton::checked}{checked} state of QAbstractButton.
\row
\o \c :closable \target closable-ps
\o The items can be closed. For example, the QDockWidget has the
QDockWidget::DockWidgetClosable feature turned on.
\row
\o \c :closed \target closed-ps
\o The item is in the closed state. For example, an non-expanded
item in a QTreeView
\row
\o \c :default \target default-ps
\o The item is the default. For example, a
\l{QPushButton::default}{default} QPushButton or a default action
in a QMenu.
\row
\o \c :disabled \target disabled-ps
\o The item is \l{QWidget::enabled}{disabled}.
\row
\o \c :editable \target editable-ps
\o The QComboBox is editable.
\row
\o \c :edit-focus \target edit-focus-ps
\o The item has edit focus (See QStyle::State_HasEditFocus). This state
is available only for Qt Extended applications.
\row
\o \c :enabled \target enabled-ps
\o The item is \l{QWidget::enabled}{enabled}.
\row
\o \c :exclusive \target exclusive-ps
\o The item is part of an exclusive item group. For example, a menu
item in a exclusive QActionGroup.
\row
\o \c :first \target first-ps
\o The item is the first (in a list). For example, the first
tab in a QTabBar.
\row
\o \c :flat \target flat-ps
\o The item is flat. For example, a
\l{QPushButton::flat}{flat} QPushButton.
\row
\o \c :floatable \target floatable-ps
\o The items can be floated. For example, the QDockWidget has the
QDockWidget::DockWidgetFloatable feature turned on.
\row
\o \c :focus \target focus-ps
\o The item has \l{QWidget::hasFocus()}{input focus}.
\row
\o \c :has-children \target has-children-ps
\o The item has children. For example, an item in a
QTreeView that has child items.
\row
\o \c :has-siblings \target has-siblings-ps
\o The item has siblings. For example, an item in a
QTreeView that siblings.
\row
\o \c :horizontal \target horizontal-ps
\o The item has horizontal orientation
\row
\o \c :hover \target hover-ps
\o The mouse is hovering over the item.
\row
\o \c :indeterminate \target indeterminate-ps
\o The item has indeterminate state. For example, a QCheckBox
or QRadioButton is \l{Qt::PartiallyChecked}{partially checked}.
\row
\o \c :last \target last-ps
\o The item is the last (in a list). For example, the last
tab in a QTabBar.
\row
\o \c :left \target left-ps
\o The item is positioned at the left. For example, a QTabBar
that has its tabs positioned at the left.
\row
\o \c :maximized \target maximized-ps
\o The item is maximized. For example, a maximized QMdiSubWindow.
\row
\o \c :middle \target middle-ps
\o The item is in the middle (in a list). For example, a tab
that is not in the beginning or the end in a QTabBar.
\row
\o \c :minimized \target minimized-ps
\o The item is minimized. For example, a minimized QMdiSubWindow.
\row
\o \c :movable \target movable-ps
\o The item can be moved around. For example, the QDockWidget has the
QDockWidget::DockWidgetMovable feature turned on.
\row
\o \c :no-frame \target no-frame-ps
\o The item has no frame. For example, a frameless QSpinBox
or QLineEdit.
\row
\o \c :non-exclusive \target non-exclusive-ps
\o The item is part of a non-exclusive item group. For example, a menu
item in a non-exclusive QActionGroup.
\row
\o \c :off \target off-ps
\o For items that can be toggled, this applies to items
in the "off" state.
\row
\o \c :on \target on-ps
\o For items that can be toggled, this applies to widgets
in the "on" state.
\row
\o \c :only-one \target only-one-ps
\o The item is the only one (in a list). For example, a lone tab
in a QTabBar.
\row
\o \c :open \target open-ps
\o The item is in the open state. For example, an expanded
item in a QTreeView, or a QComboBox or QPushButton with
an open menu.
\row
\o \c :next-selected \target next-selected-ps
\o The next item (in a list) is selected. For example, the
selected tab of a QTabBar is next to this item.
\row
\o \c :pressed \target pressed-ps
\o The item is being pressed using the mouse.
\row
\o \c :previous-selected \target previous-selected-ps
\o The previous item (in a list) is selected. For example, a
tab in a QTabBar that is next to the selected tab.
\row
\o \c :read-only \target read-only-ps
\o The item is marked read only or non-editable. For example,
a read only QLineEdit or a non-editable QComboBox.
\row
\o \c :right \target right-ps
\o The item is positioned at the right. For example, a QTabBar
that has its tabs positioned at the right.
\row
\o \c :selected \target selected-ps
\o The item is selected. For example, the selected tab in
a QTabBar or the selected item in a QMenu.
\row
\o \c :top \target top-ps
\o The item is positioned at the top. For example, a QTabBar
that has its tabs positioned at the top.
\row
\o \c :unchecked \target unchecked-ps
\o The item is
\l{QAbstractButton::checked}{unchecked}.
\row
\o \c :vertical \target vertical-ps
\o The item has vertical orientation.
\row
\o \c :window \target window-ps
\o The widget is a window (i.e top level widget)
\endtable
\target subcontrols
\section1 List of Sub-Controls
The following subcontrols are available:
\table 100%
\header
\o Sub-Control
\o Description
\row
\o \c ::add-line \target add-line-sub
\o The button to add a line of a QScrollBar.
\row
\o \c ::add-page \target add-page-sub
\o The region between the handle (slider) and the \l{#add-line-sub}{add-line}
of a QScrollBar.
\row
\o \c ::branch \target branch-sub
\o The branch indicator of a QTreeView.
\row
\o \c ::chunk \target chunk-sub
\o The progress chunk of a QProgressBar.
\row
\o \c ::close-button \target close-button-sub
\o The close button of a QDockWidget or tabs of QTabBar
\row
\o \c ::corner \target corner-sub
\o The corner between two scrollbars in a QAbstractScrollArea
\row
\o \c ::down-arrow \target down-arrow-sub
\o The down arrow of a QComboBox, QHeaderView (sort indicator),
QScrollBar or QSpinBox.
\row
\o \c ::down-button \target down-button-sub
\o The down button of a QScrollBar or a QSpinBox.
\row
\o \c ::drop-down \target drop-down-sub
\o The drop-down button of a QComboBox.
\row
\o \c ::float-button \target float-button-sub
\o The float button of a QDockWidget
\row
\o \c ::groove \target groove-sub
\o The groove of a QSlider.
\row
\o \c ::indicator \target indicator-sub
\o The indicator of a QAbstractItemView, a QCheckBox, a QRadioButton,
a checkable QMenu item or a checkable QGroupBox.
\row
\o \c ::handle \target handle-sub
\o The handle (slider) of a QScrollBar, a QSplitter, or a QSlider.
\row
\o \c ::icon \target icon-sub
\o The icon of a QAbstractItemView or a QMenu.
\row
\o \c ::item \target item-sub
\o An item of a QAbstractItemView, a QMenuBar, a QMenu, or
a QStatusBar.
\row
\o \c ::left-arrow \target left-arrow-sub
\o The left arrow of a QScrollBar.
\row
\o \c ::left-corner \target left-corner-sub
\o The left corner of a QTabWidget. For example, this control can be
used to control position the left corner widget in a QTabWidget.
\row
\o \c ::menu-arrow \target menu-arrow-sub
\o The arrow of a QToolButton with a menu.
\row
\o \c ::menu-button \target menu-button-sub
\o The menu button of a QToolButton.
\row
\o \c ::menu-indicator \target menu-indicator-sub
\o The menu indicator of a QPushButton.
\row
\o \c ::right-arrow \target right-arrow-sub
\o The right arrow of a QMenu or a QScrollBar.
\row
\o \c ::pane \target pane-sub
\o The pane (frame) of a QTabWidget.
\row
\o \c ::right-corner \target right-corner-sub
\o The right corner of a QTabWidget. For example, this control can be
used to control the position the right corner widget in a QTabWidget.
\row
\o \c ::scroller \target scroller-sub
\o The scroller of a QMenu or QTabBar.
\row
\o \c ::section \target section-sub
\o The section of a QHeaderView.
\row
\o \c ::separator \target separator-sub
\o The separator of a QMenu or in a QMainWindow.
\row
\o \c ::sub-line \target sub-line-sub
\o The button to subtract a line of a QScrollBar.
\row
\o \c ::sub-page \target sub-page-sub
\o The region between the handle (slider) and the \l{#sub-line-sub}{sub-line}
of a QScrollBar.
\row
\o \c ::tab \target tab-sub
\o The tab of a QTabBar or QToolBox.
\row
\o \c ::tab-bar \target tab-bar-sub
\o The tab bar of a QTabWidget. This subcontrol exists only to
control the position of the QTabBar inside the QTabWidget. To
style the tabs using the \l{#tab-sub}{::tab} subcontrol.
\row
\o \c ::tear \target tear-sub
\o The tear indicator of a QTabBar.
\row
\o \c ::tear-off \target tear-off-sub
\o The tear-off indicator of a QMenu.
\row
\o \c ::text \target text-ps
\o The text of a QAbstractItemView.
\row
\o \c ::title \target title-sub
\o The title of a QGroupBox or a QDockWidget.
\row
\o \c ::up-arrow \target up-arrow-sub
\o The up arrow of a QHeaderView (sort indicator), QScrollBar
or a QSpinBox.
\row
\o \c ::up-button \target up-button-sub
\o The up button of a QSpinBox.
\endtable
See \l{Customizing the QPushButton's Menu Indicator Sub-Control}
for an example of how to customize a subcontrol.
*/
/*!
\page stylesheet-examples.html
\contentspage {Qt Style Sheet}{Contents}
\previouspage Qt Style Sheets Reference
\title Qt Style Sheets Examples
We will now see a few examples to get started with using Qt Style Sheets.
\tableofcontents
\section1 Style Sheet Usage
\section2 Customizing the Foreground and Background Colors
Let's start by setting yellow as the background color of all
\l{QLineEdit}s in an application. This could be achieved like
this:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 88
If we want the property to apply only to the \l{QLineEdit}s that are
children (or grandchildren or grand-grandchildren) of a specific dialog,
we would rather do this:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 89
If we want the property to apply only to one specific QLineEdit,
we can give it a name using QObject::setObjectName() and use an
ID Selector to refer to it:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 90
Alternatively, we can set the
\l{Qt Style Sheets Reference#background-prop}{background-color} property directly on the
QLineEdit, omitting the selector:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 91
To ensure a good contrast, we should also specify a suitable
color for the text:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 92
It might be a good idea to change the colors used for selected
text as well:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 93
\section2 Customizing Using Dynamic Properties
There are many situations where we need to present a form that
has mandatory fields. To indicate to the user that the field is
mandatory, one effective (albeit esthetically dubious) solution
is to use yellow as the background color for those fields. It
turns out this is very easy to implement using Qt Style Sheets.
First, we would use the following application-wide style sheet:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 94
This means that every widget whose \c mandatoryField Qt property
is set to true would have a yellow background.
Then, for each mandatory field widget, we would simply create a
\c mandatoryField property on the fly and set it to true. For
example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 95
\section2 Customizing a QPushButton Using the Box Model
This time, we will show how to create a red QPushButton. This
QPushButton would presumably be connected to a very destructive
piece of code.
First, we are tempted to use this style sheet:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 96
However, the result is a boring, flat button with no borders:
\image stylesheet-redbutton1.png A flat red button
What happened is this:
\list
\o We have made a request that cannot be satisfied using the
native styles alone (e.g., the Windows XP theme engine doesn't
let us specify the background color of a button).
\o Therefore, the button is rendered using style sheets.
\o We haven't specified any values for
\l{Qt Style Sheets Reference#border-width-prop}{border-width} and
\l{Qt Style Sheets Reference#border-style-prop}{border-style}, so by default we obtain
a 0-pixel wide border of style \c none.
\endlist
Let's improve the situation by specifying a border:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 97
\image stylesheet-redbutton2.png A red button with a beige border
Things look already a lot better. But the button looks a bit
cramped. Let's specify some spacing between the border and the
text using the \l{Qt Style Sheets Reference#padding-prop}{padding}. Additionally, we will
enforce a minimum width, round the corners, and specify a larger
font to make the button look nicer:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 98
\image stylesheet-redbutton3.png A red button with a round beige border and big, bold text
The only issue remaining is that the button doesn't react when we
press it. We can fix this by specifying a slightly different
background color and use a different border style.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 99
\section2 Customizing the QPushButton's Menu Indicator Sub-Control
Subcontrols give access to the sub-elements of a widget. For
example, a QPushButton associated with a menu (using
QPushButton::setMenu()) has a menu indicator. Let's customize
the menu indicator for the red push button:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 100
By default, the menu indicator is located at the bottom-right
corner of the padding rectangle. We can change this by specifying
\l{Qt Style Sheets Reference#subcontrol-position-prop}{subcontrol-position} and
\l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin} to anchor the
indicator differently. We can also use \l{Qt Style Sheets Reference#top-prop}{top} and
\l{Qt Style Sheets Reference#left-prop}{left} to move the indicator by a few pixels. For
example:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 101
This positions the \c myindicator.png to the center right of the
QPushButton's \l{Qt Style Sheets Reference#padding-prop}{padding} rectangle (see
\l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin} for more
information).
\section2 Complex Selector Example
Since red seems to be our favorite color, let's make the text in
QLineEdit red by setting the following application-wide
stylesheet:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 102
However, we would like to give a visual indication that a
QLineEdit is read-only by making it appear gray:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 103
At some point, our design team comes with the requirement that
all \l{QLineEdit}s in the registration form (with the
\l{QObject::objectName}{object name} \c registrationDialog) to be
brown:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 104
A few UI design meetings later, we decide that all our
\l{QDialog}s should have brown colored \l{QLineEdit}s:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 105
Quiz: What happens if we have a read-only QLineEdit in a QDialog?
[Hint: The \l{The Style Sheet Syntax#Conflict Resolution}{Conflict Resolution} section above explains
what happens in cases like this.]
\section1 Customizing specific widgets
This section provides examples to customize specific widgets using Style Sheets.
\section2 Customizing QAbstractScrollArea
The background of any QAbstractScrollArea (Item views, QTextEdit
and QTextBrowser) can be set using the background properties. For example,
to set a background-image that scrolls with the scroll bar:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 106
If the background-image is to be fixed with the viewport:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 107
\section2 Customizing QCheckBox
Styling of a QCheckBox is almost indentical to styling a QRadioButton. The
main difference is that a tristate QCheckBox has an indeterminate state.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 108
\section2 Customizing QComboBox
We will look at an example where the drop down button of a QComboBox
appears "merged" with the combo box frame.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 109
The pop-up of the QComboBox is a QAbstractItemView and is styled using
the descendant selector:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 110
\section2 Customizing QDockWidget
The title bar and the buttons of a QDockWidget can be customized as
follows:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 111
If one desires to move the dock widget buttons to the left, the following
style sheet can be used:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 112
\note To customize the separator (resize handle) of a QDockWidget,
use QMainWindow::separator.
\section2 Customizing QFrame
A QFrame is styled using the \l{The Box Model}.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 113
\section2 Customizing QGroupBox
Let us look at an example that moves the QGroupBox's title to
the center.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 114
For a checkable QGroupBox, use the \{#indicator-sub}{::indicator} subcontrol
and style it exactly like a QCheckBox (i.e)
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 115
\section2 Customizing QHeaderView
QHeaderView is customized as follows:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 116
\section2 Customizing QLineEdit
The frame of a QLineEdit is styled using the \l{The Box Model}. To
create a line edit with rounded corners, we can set:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 117
The password character of line edits that have QLineEdit::Password
echo mode can be set using:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 118
The background of a read only QLineEdit can be modified as below:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 119
\section2 Customizing QListView
The background color of alternating rows can be customized using the following
style sheet:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 120
To provide a special background when you hover over items, we can use the
\l{item-sub}{::item} subcontrol. For example,
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 121
\section2 Customizing QMainWindow
The separator of a QMainWindow can be styled as follows:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 122
\section2 Customizing QMenu
Individual items of a QMenu are styled using the 'item' subcontrol as
follows:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 123
For a more advanced customization, use a style sheet as follows:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 124
\section2 Customizing QMenuBar
QMenuBar is styled as follows:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 125
\section2 Customizing QProgressBar
The QProgressBar's \l{stylesheet-reference.html#border-prop}{border},
\l{stylesheet-reference.html#chunk-sub}{chunk}, and
\l{stylesheet-reference.html#text-align-prop}{text-align} can be customized using
style sheets. However, if one property or sub-control is customized,
all the other properties or sub-controls must be customized as well.
\image progressBar-stylesheet.png
For example, we change the \l{stylesheet-reference.html#border-prop}
{border} to grey and the \l{stylesheet-reference.html#chunk-sub}{chunk}
to cerulean.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 126
This leaves the \l{stylesheet-reference.html#text-align-prop}
{text-align}, which we customize by positioning the text in the center of
the progress bar.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 127
A \l{stylesheet-reference.html#margin-prop}{margin} can be included to
obtain more visible chunks.
\image progressBar2-stylesheet.png
In the screenshot above, we use a
\l{stylesheet-reference.html#margin-prop}{margin} of 0.5 pixels.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 128
\section2 Customizing QPushButton
A QPushButton is styled as follows:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 129
For a QPushButton with a menu, use the
\l{Qt Style Sheets Reference#menu-indicator-sub}{::menu-indicator}
subcontrol.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 130
Checkable QPushButton have the \l{Qt Style Sheets Reference#checked-ps}
{:checked} pseudo state set.
\section2 Customizing QRadioButton
The indicator of a QRadioButton can be changed using:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 131
\section2 Customizing QScrollBar
The QScrollBar can be styled using its subcontrols like
\l{stylesheet-reference.html#handle-sub}{handle},
\l{stylesheet-reference.html#add-line-sub}{add-line},
\l{stylesheet-reference.html#sub-line-sub}{sub-line}, and so on. Note that
if one property or sub-control is customized, all the other properties or
sub-controls must be customized as well.
\image stylesheet-scrollbar1.png
The scroll bar above has been styled in aquamarine with a solid grey
border.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 132
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 133
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 134
The \l{stylesheet-reference.html#left-arrow-sub}{left-arrow} and
\l{stylesheet-reference.html#right-arrow-sub}{right-arrow} have a solid grey
border with a white background. As an alternative, you could also embed the
image of an arrow.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 135
If you want the scroll buttons of the scroll bar to be placed together
(instead of the edges) like on Mac OS X, you can use the following
stylesheet:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 136
The scroll bar using the above stylesheet looks like this:
\image stylesheet-scrollbar2.png
To customize a vertical scroll bar use a style sheet similar to the following:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 137
\section2 Customizing QSizeGrip
QSizeGrip is usually styled by just setting an image.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 138
\section2 Customizing QSlider
You can style horizontal slider as below:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 139
If you want to change the color of the slider parts before and after the handle, you can use the add-page
and sub-page subcontrols. For example, for a vertical slider:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 140
\section2 Customizing QSpinBox
QSpinBox can be completely customized as below (the style sheet has commentary inline):
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 141
\section2 Customizing QSplitter
A QSplitter derives from a QFrame and hence can be styled like a QFrame.
The grip or the handle is customized using the
\l{Qt Style Sheets Reference#handle-sub}{::handle} subcontrol.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 142
\section2 Customizing QStatusBar
We can provide a background for the status bar and a border for items
inside the status bar as follows:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 143
Note that widgets that have been added to the QStatusBar can be styled
using the descendant declaration (i.e)
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 144
\section2 Customizing QTabWidget and QTabBar
\image tabWidget-stylesheet1.png
For the screenshot above, we need a stylesheet as follows:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 145
Often we require the tabs to overlap to look like below:
\image tabWidget-stylesheet2.png
For a tab widget that looks like above, we make use of
\l{http://www.communitymx.com/content/article.cfm?cid=B0029}
{negative margins}. The resulting stylesheet looks like this:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 146
To move the tab bar to the center (as below), we require the following stylesheet:
\image tabWidget-stylesheet3.png
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 147
The tear indicator and the scroll buttons can be further customized as follows:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 148
Sine Qt 4.6 the close button can be customized as follow:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 159
\section2 Customizing QTableView
Suppose we'd like our selected item in QTableView to have bubblegum pink
fade to white as its background.
\image tableWidget-stylesheet.png
This is possible with the
\l{stylesheet-reference.html#selection-background-color-prop}
{selection-background-color} property and the syntax required is:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 149
The corner widget can be customized using the following style sheet
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 150
\section2 Customizing QToolBar
The background and the handle of a QToolBar is customized as below:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 151
\section2 Customizing QToolBox
The tabs of the QToolBox are customized using the 'tab' subcontrol.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 152
\section2 Customizing QToolButton
There are three types of QToolButtons.
\list
\i The QToolButton has no menu. In this case, the QToolButton is styled
exactly like QPushButton. See
\l{#Customizing QPushButton}{Customizing QPushButton} for an
example.
\i The QToolButton has a menu and has the QToolButton::popupMode set to
QToolButton::DelayedPopup or QToolButton::InstantPopup. In this case,
the QToolButton is styled exactly like a QPushButton with a menu.
See \l{#Customizing QPushButton}{Customizing QPushButton} for an
example of the usage of the menu-indicator pseudo state.
\i The QToolButton has its QToolButton::popupMode set to
QToolButton::MenuButtonPopup. In this case, we style it as follows:
\endlist
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 153
\section2 Customizing QToolTip
QToolTip is customized exactly like a QLabel. In addition, for platforms
that support it, the opacity property may be set to adjust the opacity.
For example,
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 154
\section2 Customizing QTreeView
The background color of alternating rows can be customized using the following
style sheet:
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 155
To provide a special background when you hover over items, we can use the
\l{item-sub}{::item} subcontrol. For example,
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 156
The branches of a QTreeView are styled using the
\l{Qt Style Sheets Reference#branch-sub}{::branch} subcontrol. The
following stylesheet color codes the various states when drawing
a branch.
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 157
Colorful, though it is, a more useful example can be made using the
following images:
\table
\row
\o \inlineimage stylesheet-vline.png
\o \inlineimage stylesheet-branch-more.png
\o \inlineimage stylesheet-branch-end.png
\o \inlineimage stylesheet-branch-closed.png
\o \inlineimage stylesheet-branch-open.png
\row
\o vline.png
\o branch-more.png
\o branch-end.png
\o branch-closed.png
\o branch-open.png
\endtable
\snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 158
The resulting tree view looks like this:
\image stylesheet-treeview.png
\sa {Style Sheet Example}, {Supported HTML Subset}, QStyle
\section1 Common mistakes
This section lists some common mistakes when using stylesheets.
\section2 QPushButton and images
When styling a QPushButton, it is often desirable to use an image as the
button graphic. It is common to try the
\l{Qt Style Sheets Reference#background-image-prop}{background-image}
property,
but this has a number of drawbacks: For instance, the background will
often appear hidden behind the button decoration, because it is not
considered a background. In addition, if the button is resized, the
entire background will be stretched or tiled, which does not
always look good.
It is better to use the
\l{Qt Style Sheets Reference#border-image-prop}{border-image}
property, as it will always display the image,
regardless of the background (you can combine it with a background if it
has alpha values in it), and it has special settings to deal with button
resizing.
Consider the following snippet:
\snippet doc/src/snippets/stylesheet/common-mistakes.cpp 1
This will produce a button looking like this:
\image stylesheet-border-image-normal.png
The numbers after the url gives the top, right, bottom and left number of
pixels, respectively. These numbers correspond to the border and should not
stretch when the size changes.
Whenever you resize the button, the middle part of the image will stretch
in both directions, while the pixels specified in the stylesheet
will not. This makes the borders of the button look more natural, like
this:
\table
\row
\o \inlineimage stylesheet-border-image-stretched.png
\row
\o With borders
\endtable
\table
\row
\o \inlineimage stylesheet-border-image-wrong.png
\row
\o Without borders
\endtable
*/