author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 01:19:32 +0300 | |
changeset 37 | 758a864f9613 |
parent 33 | 3e2da88830cd |
permissions | -rw-r--r-- |
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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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** $QT_BEGIN_LICENSE:FDL$ |
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** Commercial Usage |
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** Licensees holding valid Qt Commercial licenses may use this file in |
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** accordance with the Qt Commercial License Agreement provided with the |
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** Software or, alternatively, in accordance with the terms contained in a |
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** written agreement between you and Nokia. |
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** |
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** GNU Free Documentation License |
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** Alternatively, this file may be used under the terms of the GNU Free |
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** Documentation License version 1.3 as published by the Free Software |
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** Foundation and appearing in the file included in the packaging of this |
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** file. |
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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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** $QT_END_LICENSE$ |
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** |
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****************************************************************************/ |
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||
28 |
/*! |
|
29 |
\class QSizePolicy |
|
30 |
\brief The QSizePolicy class is a layout attribute describing horizontal |
|
31 |
and vertical resizing policy. |
|
32 |
||
33 |
\ingroup geomanagement |
|
34 |
||
35 |
The size policy of a widget is an expression of its willingness to |
|
36 |
be resized in various ways, and affects how the widget is treated |
|
37 |
by the \l{Layout Management}{layout engine}. Each widget returns a |
|
38 |
QSizePolicy that describes the horizontal and vertical resizing |
|
39 |
policy it prefers when being laid out. You can change this for |
|
40 |
a specific widget by changing its QWidget::sizePolicy property. |
|
41 |
||
42 |
QSizePolicy contains two independent QSizePolicy::Policy values |
|
43 |
and two stretch factors; one describes the widgets's horizontal |
|
44 |
size policy, and the other describes its vertical size policy. It |
|
45 |
also contains a flag to indicate whether the height and width of |
|
46 |
its preferred size are related. |
|
47 |
||
48 |
The horizontal and vertical policies can be set in the |
|
49 |
constructor, and altered using the setHorizontalPolicy() and |
|
50 |
setVerticalPolicy() functions. The stretch factors can be set |
|
51 |
using the setHorizontalStretch() and setVerticalStretch() |
|
52 |
functions. The flag indicating whether the widget's |
|
53 |
\l{QWidget::sizeHint()}{sizeHint()} is width-dependent (such as a |
|
54 |
menu bar or a word-wrapping label) can be set using the |
|
55 |
setHeightForWidth() function. |
|
56 |
||
57 |
The current size policies and stretch factors be retrieved using |
|
58 |
the horizontalPolicy(), verticalPolicy(), horizontalStretch() and |
|
59 |
verticalStretch() functions. Alternatively, use the transpose() |
|
60 |
function to swap the horizontal and vertical policies and |
|
61 |
stretches. The hasHeightForWidth() function returns the current |
|
62 |
status of the flag indicating the size hint dependencies. |
|
63 |
||
64 |
Use the expandingDirections() function to determine whether the |
|
65 |
associated widget can make use of more space than its |
|
66 |
\l{QWidget::sizeHint()}{sizeHint()} function indicates, as well as |
|
67 |
find out in which directions it can expand. |
|
68 |
||
69 |
Finally, the QSizePolicy class provides operators comparing this |
|
70 |
size policy to a given policy, as well as a QVariant operator |
|
71 |
storing this QSizePolicy as a QVariant object. |
|
72 |
||
73 |
\sa QSize, QWidget::sizeHint(), QWidget::sizePolicy, |
|
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QLayoutItem::sizeHint() |
|
75 |
*/ |
|
76 |
||
77 |
/*! |
|
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\enum QSizePolicy::PolicyFlag |
|
79 |
||
80 |
These flags are combined together to form the various \l{Policy} |
|
81 |
values: |
|
82 |
||
83 |
\value GrowFlag The widget can grow beyond its size hint if necessary. |
|
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\value ExpandFlag The widget should get as much space as possible. |
|
85 |
\value ShrinkFlag The widget can shrink below its size hint if necessary. |
|
86 |
\value IgnoreFlag The widget's size hint is ignored. The widget will get |
|
87 |
as much space as possible. |
|
88 |
||
89 |
\sa Policy |
|
90 |
*/ |
|
91 |
||
92 |
/*! |
|
93 |
\enum QSizePolicy::Policy |
|
94 |
||
95 |
This enum describes the various per-dimension sizing types used |
|
96 |
when constructing a QSizePolicy. |
|
97 |
||
98 |
\value Fixed The QWidget::sizeHint() is the only acceptable |
|
99 |
alternative, so the widget can never grow or shrink (e.g. the |
|
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vertical direction of a push button). |
|
101 |
||
102 |
\value Minimum The sizeHint() is minimal, and sufficient. The |
|
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widget can be expanded, but there is no advantage to it being |
|
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larger (e.g. the horizontal direction of a push button). |
|
105 |
It cannot be smaller than the size provided by sizeHint(). |
|
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||
107 |
\value Maximum The sizeHint() is a maximum. The widget can be |
|
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shrunk any amount without detriment if other widgets need the |
|
109 |
space (e.g. a separator line). |
|
110 |
It cannot be larger than the size provided by sizeHint(). |
|
111 |
||
112 |
\value Preferred The sizeHint() is best, but the widget can be |
|
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shrunk and still be useful. The widget can be expanded, but there |
|
114 |
is no advantage to it being larger than sizeHint() (the default |
|
115 |
QWidget policy). |
|
116 |
||
117 |
\value Expanding The sizeHint() is a sensible size, but the |
|
118 |
widget can be shrunk and still be useful. The widget can make use |
|
119 |
of extra space, so it should get as much space as possible (e.g. |
|
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the horizontal direction of a horizontal slider). |
|
121 |
||
122 |
\value MinimumExpanding The sizeHint() is minimal, and sufficient. |
|
123 |
The widget can make use of extra space, so it should get as much |
|
124 |
space as possible (e.g. the horizontal direction of a horizontal |
|
125 |
slider). |
|
126 |
||
127 |
\value Ignored The sizeHint() is ignored. The widget will get as |
|
128 |
much space as possible. |
|
129 |
||
130 |
\sa PolicyFlag, setHorizontalPolicy(), setVerticalPolicy() |
|
131 |
*/ |
|
132 |
||
133 |
/*! |
|
134 |
\fn QSizePolicy::QSizePolicy() |
|
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||
136 |
Constructs a QSizePolicy object with \l Fixed as its horizontal |
|
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and vertical policies. |
|
138 |
||
139 |
The policies can be altered using the setHorizontalPolicy() and |
|
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setVerticalPolicy() functions. Use the setHeightForWidth() |
|
141 |
function if the preferred height of the widget is dependent on the |
|
142 |
width of the widget (for example, a QLabel with line wrapping). |
|
143 |
||
144 |
\sa setHorizontalStretch(), setVerticalStretch() |
|
145 |
*/ |
|
146 |
||
147 |
/*! |
|
148 |
\fn QSizePolicy::QSizePolicy(Policy horizontal, Policy vertical) |
|
149 |
||
150 |
Constructs a QSizePolicy object with the given \a horizontal and |
|
151 |
\a vertical policies, and DefaultType as the control type. |
|
152 |
||
153 |
Use setHeightForWidth() if the preferred height of the widget is |
|
154 |
dependent on the width of the widget (for example, a QLabel with |
|
155 |
line wrapping). |
|
156 |
||
157 |
\sa setHorizontalStretch(), setVerticalStretch() |
|
158 |
*/ |
|
159 |
||
160 |
/*! |
|
161 |
\fn QSizePolicy::QSizePolicy(Policy horizontal, Policy vertical, ControlType type) |
|
162 |
\since 4.3 |
|
163 |
||
164 |
Constructs a QSizePolicy object with the given \a horizontal and |
|
165 |
\a vertical policies, and the specified control \a type. |
|
166 |
||
167 |
Use setHeightForWidth() if the preferred height of the widget is |
|
168 |
dependent on the width of the widget (for example, a QLabel with |
|
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line wrapping). |
|
170 |
||
171 |
\sa setHorizontalStretch(), setVerticalStretch(), controlType() |
|
172 |
*/ |
|
173 |
||
174 |
/*! |
|
175 |
\fn QSizePolicy::Policy QSizePolicy::horizontalPolicy() const |
|
176 |
||
177 |
Returns the horizontal component of the size policy. |
|
178 |
||
179 |
\sa setHorizontalPolicy(), verticalPolicy(), horizontalStretch() |
|
180 |
*/ |
|
181 |
||
182 |
/*! |
|
183 |
\fn QSizePolicy::Policy QSizePolicy::verticalPolicy() const |
|
184 |
||
185 |
Returns the vertical component of the size policy. |
|
186 |
||
187 |
\sa setVerticalPolicy(), horizontalPolicy(), verticalStretch() |
|
188 |
*/ |
|
189 |
||
190 |
/*! |
|
191 |
\fn void QSizePolicy::setHorizontalPolicy(Policy policy) |
|
192 |
||
193 |
Sets the horizontal component to the given \a policy. |
|
194 |
||
195 |
\sa horizontalPolicy(), setVerticalPolicy(), setHorizontalStretch() |
|
196 |
*/ |
|
197 |
||
198 |
/*! |
|
199 |
\fn void QSizePolicy::setVerticalPolicy(Policy policy) |
|
200 |
||
201 |
Sets the vertical component to the given \a policy. |
|
202 |
||
203 |
\sa verticalPolicy(), setHorizontalPolicy(), setVerticalStretch() |
|
204 |
*/ |
|
205 |
||
206 |
/*! |
|
207 |
\fn Qt::Orientations QSizePolicy::expandingDirections() const |
|
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||
209 |
Returns whether a widget can make use of more space than the |
|
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QWidget::sizeHint() function indicates. |
|
211 |
||
212 |
A value of Qt::Horizontal or Qt::Vertical means that the widget |
|
213 |
can grow horizontally or vertically (i.e., the horizontal or |
|
214 |
vertical policy is \l Expanding or \l MinimumExpanding), whereas |
|
215 |
Qt::Horizontal | Qt::Vertical means that it can grow in both |
|
216 |
dimensions. |
|
217 |
||
218 |
\sa horizontalPolicy(), verticalPolicy() |
|
219 |
*/ |
|
220 |
||
221 |
/*! |
|
222 |
\fn ControlType QSizePolicy::controlType() const |
|
223 |
\since 4.3 |
|
224 |
||
225 |
Returns the control type associated with the widget for which |
|
226 |
this size policy applies. |
|
227 |
*/ |
|
228 |
||
229 |
/*! |
|
230 |
\fn void QSizePolicy::setControlType(ControlType type) |
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231 |
\since 4.3 |
|
232 |
||
233 |
Sets the control type associated with the widget for which this |
|
234 |
size policy applies to \a type. |
|
235 |
||
236 |
The control type specifies the type of the widget for which this |
|
237 |
size policy applies. It is used by some styles, notably |
|
238 |
QMacStyle, to insert proper spacing between widgets. For example, |
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239 |
the Mac OS X Aqua guidelines specify that push buttons should be |
|
240 |
separated by 12 pixels, whereas vertically stacked radio buttons |
|
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only require 6 pixels. |
|
242 |
||
243 |
\sa QStyle::layoutSpacing() |
|
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*/ |
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245 |
||
246 |
/*! |
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247 |
\fn void QSizePolicy::setHeightForWidth(bool dependent) |
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248 |
||
249 |
Sets the flag determining whether the widget's preferred height |
|
250 |
depends on its width, to \a dependent. |
|
251 |
||
252 |
\sa hasHeightForWidth() |
|
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*/ |
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254 |
||
255 |
/*! |
|
256 |
\fn bool QSizePolicy::hasHeightForWidth() const |
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||
258 |
Returns true if the widget's preferred height depends on its |
|
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width; otherwise returns false. |
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||
261 |
\sa setHeightForWidth() |
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*/ |
|
263 |
||
264 |
/*! |
|
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\fn bool QSizePolicy::operator==(const QSizePolicy &other) const |
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||
267 |
Returns true if this policy is equal to \a other; otherwise |
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returns false. |
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269 |
||
270 |
\sa operator!=() |
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*/ |
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||
273 |
/*! |
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274 |
\fn bool QSizePolicy::operator!=(const QSizePolicy &other) const |
|
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||
276 |
Returns true if this policy is different from \a other; otherwise |
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returns false. |
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||
279 |
\sa operator==() |
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*/ |
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||
282 |
/*! |
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\fn int QSizePolicy::horizontalStretch() const |
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||
285 |
Returns the horizontal stretch factor of the size policy. |
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||
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\sa setHorizontalStretch(), verticalStretch(), horizontalPolicy() |
|
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*/ |
|
289 |
||
290 |
/*! |
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\fn int QSizePolicy::verticalStretch() const |
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||
293 |
Returns the vertical stretch factor of the size policy. |
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294 |
||
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\sa setVerticalStretch(), horizontalStretch(), verticalPolicy() |
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*/ |
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||
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/*! |
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\fn void QSizePolicy::setHorizontalStretch(uchar stretchFactor) |
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||
301 |
Sets the horizontal stretch factor of the size policy to the given \a |
|
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stretchFactor. |
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||
304 |
\sa horizontalStretch(), setVerticalStretch(), setHorizontalPolicy() |
|
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*/ |
|
306 |
||
307 |
/*! |
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308 |
\fn void QSizePolicy::setVerticalStretch(uchar stretchFactor) |
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309 |
||
310 |
Sets the vertical stretch factor of the size policy to the given |
|
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\a stretchFactor. |
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||
313 |
\sa verticalStretch(), setHorizontalStretch(), setVerticalPolicy() |
|
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*/ |
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315 |
||
316 |
/*! |
|
317 |
\fn void QSizePolicy::transpose() |
|
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||
319 |
Swaps the horizontal and vertical policies and stretches. |
|
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*/ |
|
321 |
||
322 |
/*! |
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\enum QSizePolicy::ControlType |
|
324 |
\since 4.3 |
|
325 |
||
326 |
This enum specifies the different types of widgets in terms of |
|
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layout interaction: |
|
328 |
||
329 |
\value DefaultType The default type, when none is specified. |
|
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\value ButtonBox A QDialogButtonBox instance. |
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\value CheckBox A QCheckBox instance. |
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\value ComboBox A QComboBox instance. |
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\value Frame A QFrame instance. |
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\value GroupBox A QGroupBox instance. |
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\value Label A QLabel instance. |
|
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\value Line A QFrame instance with QFrame::HLine or QFrame::VLine. |
|
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\value LineEdit A QLineEdit instance. |
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\value PushButton A QPushButton instance. |
|
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\value RadioButton A QRadioButton instance. |
|
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\value Slider A QAbstractSlider instance. |
|
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\value SpinBox A QAbstractSpinBox instance. |
|
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\value TabWidget A QTabWidget instance. |
|
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\value ToolButton A QToolButton instance. |
|
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||
345 |
\sa setControlType(), controlType() |
|
346 |
*/ |
|
347 |
||
348 |
#ifdef QT3_SUPPORT |
|
349 |
/*! |
|
350 |
\typedef QSizePolicy::SizeType |
|
351 |
\compat |
|
352 |
||
353 |
Use the QSizePolicy::Policy enum instead. |
|
354 |
*/ |
|
355 |
||
356 |
/*! |
|
357 |
\enum QSizePolicy::ExpandData |
|
358 |
\compat |
|
359 |
||
360 |
Use the Qt::Orientations enum instead. |
|
361 |
||
362 |
\value NoDirection Use 0 instead. |
|
363 |
\value Horizontally Use Qt::Horizontal instead. |
|
364 |
\value Vertically Use Qt::Vertical instead. |
|
365 |
\value BothDirections Use Qt::Horizontal | Qt::Vertical instead. |
|
366 |
*/ |
|
367 |
||
368 |
/*! |
|
369 |
\fn bool QSizePolicy::mayShrinkHorizontally() const |
|
370 |
||
371 |
Use the horizontalPolicy() function combined with the |
|
372 |
QSizePolicy::PolicyFlag enum instead. |
|
373 |
||
374 |
\oldcode |
|
375 |
bool policy = mayShrinkHorizontally(); |
|
376 |
\newcode |
|
377 |
bool policy = horizontalPolicy() & QSizePolicy::ShrinkFlag; |
|
378 |
\endcode |
|
379 |
*/ |
|
380 |
||
381 |
/*! |
|
382 |
\fn bool QSizePolicy::mayShrinkVertically() const |
|
383 |
||
384 |
Use the verticalPolicy() function combined with the |
|
385 |
QSizePolicy::PolicyFlag enum instead. |
|
386 |
||
387 |
\oldcode |
|
388 |
bool policy = mayShrinkVertically(); |
|
389 |
\newcode |
|
390 |
bool policy = verticalPolicy() & QSizePolicy::ShrinkFlag; |
|
391 |
\endcode |
|
392 |
*/ |
|
393 |
||
394 |
/*! |
|
395 |
\fn bool QSizePolicy::mayGrowHorizontally() const |
|
396 |
||
397 |
Use the horizontalPolicy() function combined with the |
|
398 |
QSizePolicy::PolicyFlag enum instead. |
|
399 |
||
400 |
\oldcode |
|
401 |
bool policy = mayGrowHorizontally(); |
|
402 |
\newcode |
|
403 |
bool policy = horizontalPolicy() & QSizePolicy::GrowFlag; |
|
404 |
\endcode |
|
405 |
*/ |
|
406 |
||
407 |
/*! |
|
408 |
\fn bool QSizePolicy::mayGrowVertically() const |
|
409 |
||
410 |
Use the verticalPolicy() function combined with the |
|
411 |
QSizePolicy::PolicyFlag enum instead. |
|
412 |
||
413 |
\oldcode |
|
414 |
bool policy = mayGrowVertically(); |
|
415 |
\newcode |
|
416 |
bool policy = verticalPolicy() & QSizePolicy::GrowFlag; |
|
417 |
\endcode |
|
418 |
*/ |
|
419 |
||
420 |
/*! |
|
421 |
\fn Qt::QSizePolicy::Orientations QSizePolicy::expanding() const |
|
422 |
||
423 |
Use expandingDirections() instead. |
|
424 |
*/ |
|
425 |
||
426 |
/*! |
|
427 |
\fn QSizePolicy::QSizePolicy(Policy horizontal, Policy vertical, bool dependent) |
|
428 |
||
429 |
Use the QSizePolicy() constructor and the setHeightForWidth() |
|
430 |
function instead. |
|
431 |
||
432 |
\oldcode |
|
433 |
QSizePolicy *policy = new QSizePolicy(horizontal, vertical, dependent); |
|
434 |
\newcode |
|
435 |
QSizePolicy *policy = new QSizePolicy(horizontal, vertical); |
|
436 |
policy->setHeightForWidth(dependent); |
|
437 |
\endcode |
|
438 |
*/ |
|
439 |
||
440 |
/*! |
|
441 |
\fn QSizePolicy::QSizePolicy(Policy horizontal, Policy vertical, uchar horizontalStretch, |
|
442 |
uchar verticalStretch, bool dependent) |
|
443 |
||
444 |
Use the QSizePolicy() constructor and call the |
|
445 |
setHorizontalStretch(), setVerticalStretch(), and |
|
446 |
setHeightForWidth() functions instead. |
|
447 |
||
448 |
\oldcode |
|
449 |
QSizePolicy *policy = new QSizePolicy(horizontal, vertical, |
|
450 |
horizontalStretch, verticalStretch, |
|
451 |
dependent); |
|
452 |
\newcode |
|
453 |
QSizePolicy *policy = new QSizePolicy(horizontal, vertical); |
|
454 |
policy->setHorizontalStretch(horizontalStretch); |
|
455 |
policy->setVerticalStretch(verticalStretch); |
|
456 |
policy->setHeightForWidth(dependent); |
|
457 |
\endcode |
|
458 |
*/ |
|
459 |
||
460 |
/*! |
|
461 |
\fn QSizePolicy::Policy QSizePolicy::horData() const |
|
462 |
||
463 |
Use horizontalPolicy() instead. |
|
464 |
*/ |
|
465 |
||
466 |
/*! |
|
467 |
\fn QSizePolicy::Policy QSizePolicy::verData() const |
|
468 |
||
469 |
Use verticalPolicy() instead. |
|
470 |
*/ |
|
471 |
||
472 |
/*! |
|
473 |
\fn void QSizePolicy::setHorData(Policy policy) |
|
474 |
||
475 |
Use setHorizontalPolicy() instead. |
|
476 |
*/ |
|
477 |
||
478 |
/*! |
|
479 |
\fn void QSizePolicy::setVerData(Policy policy) |
|
480 |
||
481 |
Use setVerticalPolicy() instead. |
|
482 |
*/ |
|
483 |
||
484 |
/*! |
|
485 |
\fn uint QSizePolicy::horStretch() const |
|
486 |
||
487 |
Use horizontalStretch() instead. |
|
488 |
*/ |
|
489 |
||
490 |
/*! |
|
491 |
\fn uint QSizePolicy::verStretch() const |
|
492 |
||
493 |
Use verticalStretch() instead. |
|
494 |
*/ |
|
495 |
||
496 |
/*! |
|
497 |
\fn void QSizePolicy::setHorStretch(uchar stretch) |
|
498 |
||
499 |
Use setHorizontalStretch() instead. |
|
500 |
*/ |
|
501 |
||
502 |
/*! |
|
503 |
\fn void QSizePolicy::setVerStretch(uchar stretch) |
|
504 |
||
505 |
Use setVerticalStretch() instead. |
|
506 |
*/ |
|
507 |
#endif |