doc/src/examples/spinboxes.qdoc
author Eckhart Koeppen <eckhart.koppen@nokia.com>
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the documentation of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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/*! 
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    \example widgets/spinboxes
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    \title Spin Boxes Example
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    The Spin Boxes example shows how to use the many different types of spin boxes
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    available in Qt, from a simple QSpinBox widget to more complex editors like
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    the QDateTimeEdit widget.
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    \image spinboxes-example.png
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    The example consists of a single \c Window class that is used to display the
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    different spin box-based widgets available with Qt.
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    \section1 Window Class Definition
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    The \c Window class inherits QWidget and contains two slots that are used
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    to provide interactive features:
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    \snippet examples/widgets/spinboxes/window.h 0
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    The private functions are used to set up each type of spin box in the window.
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    We use member variables to keep track of various widgets so that they can
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    be reconfigured when required.
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    \section1 Window Class Implementation
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    The constructor simply calls private functions to set up the different types
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    of spin box used in the example, and places each group in a layout:
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    \snippet examples/widgets/spinboxes/window.cpp 0
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    We use the layout to manage the arrangement of the window's child widgets,
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    and change the window title.
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    The \c createSpinBoxes() function constructs a QGroupBox and places three
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    QSpinBox widgets inside it with descriptive labels to indicate the types of
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    input they expect.
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    \snippet examples/widgets/spinboxes/window.cpp 1
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    The first spin box shows the simplest way to use QSpinBox. It accepts values
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    from -20 to 20, the current value can be increased or decreased by 1 with
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    either the arrow buttons or \key{Up} and \key{Down} keys, and the default
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    value is 0.
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    The second spin box uses a larger step size and displays a suffix to
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    provide more information about the type of data the number represents:
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    \snippet examples/widgets/spinboxes/window.cpp 2
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    This spin box also displays a
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    \l{QAbstractSpinBox::specialValueText}{special value} instead of the minimum
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    value defined for it. This means that it will never show \gui{0%}, but will
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    display \gui{Automatic} when the minimum value is selected.
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    The third spin box shows how a prefix can be used:
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    \snippet examples/widgets/spinboxes/window.cpp 4
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    For simplicity, we show a spin box with a prefix and no suffix. It is also
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    possible to use both at the same time.
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    \snippet examples/widgets/spinboxes/window.cpp 5
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    The rest of the function sets up a layout for the group box and places each
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    of the widgets inside it.
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    The \c createDateTimeEdits() function constructs another group box with a
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    selection of spin boxes used for editing dates and times.
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    \snippet examples/widgets/spinboxes/window.cpp 6
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    The first spin box is a QDateEdit widget that is able to accept dates
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    within a given range specified using QDate values. The arrow buttons and
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    \key{Up} and \key{Down} keys can be used to increase and decrease the
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    values for year, month, and day when the cursor is in the relevant section.
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    The second spin box is a QTimeEdit widget:
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    \snippet examples/widgets/spinboxes/window.cpp 7
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    Acceptable values for the time are defined using QTime values.
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    The third spin box is a QDateTimeEdit widget that can display both date and
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    time values, and we place a label above it to indicate the range of allowed
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    times for a meeting. These widgets will be updated when the user changes a
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    format string.
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    \snippet examples/widgets/spinboxes/window.cpp 8
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    The format string used for the date time editor, which is also shown in the
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    string displayed by the label, is chosen from a set of strings in a combobox:
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    \snippet examples/widgets/spinboxes/window.cpp 9
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    \codeline
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    \snippet examples/widgets/spinboxes/window.cpp 10
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    A signal from this combobox is connected to a slot in the \c Window class
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    (shown later).
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    \snippet examples/widgets/spinboxes/window.cpp 11
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    Each child widget of the group box in placed in a layout.
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    The \c setFormatString() slot is called whenever the user selects a new
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    format string in the combobox. The display format for the QDateTimeEdit
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    widget is set using the raw string passed by the signal:
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    \snippet examples/widgets/spinboxes/window.cpp 12
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    Depending on the visible sections in the widget, we set a new date or time
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    range, and update the associated label to provide relevant information for
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    the user:
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    \snippet examples/widgets/spinboxes/window.cpp 13
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    When the format string is changed, there will be an appropriate label and
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    entry widget for dates, times, or both types of input.
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    The \c createDoubleSpinBoxes() function constructs three spin boxes that are
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    used to input double-precision floating point numbers:
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    \snippet examples/widgets/spinboxes/window.cpp 14
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    Before the QDoubleSpinBox widgets are constructed, we create a spin box to
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    control how many decimal places they show. By default, only two decimal places
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    are shown in the following spin boxes, each of which is the equivalent of a
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    spin box in the group created by the \c createSpinBoxes() function.
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    The first double spin box shows a basic double-precision spin box with the
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    same range, step size, and default value as the first spin box in the
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    \c createSpinBoxes() function:
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    \snippet examples/widgets/spinboxes/window.cpp 15
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    However, this spin box also allows non-integer values to be entered.
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    The second spin box displays a suffix and shows a special value instead
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    of the minimum value:
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    \snippet examples/widgets/spinboxes/window.cpp 16
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    The third spin box displays a prefix instead of a suffix:
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    \snippet examples/widgets/spinboxes/window.cpp 17
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    We connect the QSpinBox widget that specifies the precision to a slot in
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    the \c Window class.
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    \snippet examples/widgets/spinboxes/window.cpp 18
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    The rest of the function places each of the widgets into a layout for the
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    group box.
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    The \c changePrecision() slot is called when the user changes the value in
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    the precision spin box:
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    \snippet examples/widgets/spinboxes/window.cpp 19
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    This function simply uses the integer supplied by the signal to specify the
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    number of decimal places in each of the QDoubleSpinBox widgets. Each one
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    of these will be updated automatically when their
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    \l{QDoubleSpinBox::decimals}{decimals} property is changed.
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*/