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/****************************************************************************
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**
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** Copyright (C) 2009 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 QtGui module 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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#include "qlayout.h"
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#include "qapplication.h"
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#include "qlayoutengine_p.h"
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#include "qmenubar.h"
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#include "qtoolbar.h"
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#include "qevent.h"
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#include "qstyle.h"
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#include "qvariant.h"
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#include "qwidget_p.h"
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QT_BEGIN_NAMESPACE
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inline static QRect fromLayoutItemRect(QWidgetPrivate *priv, const QRect &rect)
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{
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return rect.adjusted(priv->leftLayoutItemMargin, priv->topLayoutItemMargin,
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-priv->rightLayoutItemMargin, -priv->bottomLayoutItemMargin);
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}
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inline static QSize fromLayoutItemSize(QWidgetPrivate *priv, const QSize &size)
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{
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return fromLayoutItemRect(priv, QRect(QPoint(0, 0), size)).size();
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}
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inline static QRect toLayoutItemRect(QWidgetPrivate *priv, const QRect &rect)
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{
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return rect.adjusted(-priv->leftLayoutItemMargin, -priv->topLayoutItemMargin,
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priv->rightLayoutItemMargin, priv->bottomLayoutItemMargin);
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}
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inline static QSize toLayoutItemSize(QWidgetPrivate *priv, const QSize &size)
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{
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return toLayoutItemRect(priv, QRect(QPoint(0, 0), size)).size();
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}
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/*!
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Returns a QVariant storing this QSizePolicy.
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*/
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QSizePolicy::operator QVariant() const
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{
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return QVariant(QVariant::SizePolicy, this);
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}
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/*!
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\class QLayoutItem
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\brief The QLayoutItem class provides an abstract item that a
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QLayout manipulates.
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\ingroup geomanagement
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This is used by custom layouts.
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Pure virtual functions are provided to return information about
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the layout, including, sizeHint(), minimumSize(), maximumSize()
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and expanding().
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The layout's geometry can be set and retrieved with setGeometry()
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and geometry(), and its alignment with setAlignment() and
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alignment().
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isEmpty() returns whether the layout item is empty. If the
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concrete item is a QWidget, it can be retrieved using widget().
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Similarly for layout() and spacerItem().
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Some layouts have width and height interdependencies. These can
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be expressed using hasHeightForWidth(), heightForWidth(), and
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minimumHeightForWidth(). For more explanation see the \e{Qt
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Quarterly} article
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\l{http://qt.nokia.com/doc/qq/qq04-height-for-width.html}{Trading
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Height for Width}.
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\sa QLayout
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*/
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/*!
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\class QSpacerItem
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\ingroup geomanagement
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\brief The QSpacerItem class provides blank space in a layout.
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Normally, you don't need to use this class directly. Qt's
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built-in layout managers provide the following functions for
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manipulating empty space in layouts:
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\table
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\header \o Class
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\o Functions
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\row \o QHBoxLayout
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\o \l{QBoxLayout::addSpacing()}{addSpacing()},
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\l{QBoxLayout::addStretch()}{addStretch()},
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\l{QBoxLayout::insertSpacing()}{insertSpacing()},
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\l{QBoxLayout::insertStretch()}{insertStretch()}
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\row \o QGridLayout
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\o \l{QGridLayout::setRowMinimumHeight()}{setRowMinimumHeight()},
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\l{QGridLayout::setRowStretch()}{setRowStretch()},
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\l{QGridLayout::setColumnMinimumWidth()}{setColumnMinimumWidth()},
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\l{QGridLayout::setColumnStretch()}{setColumnStretch()}
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\endtable
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\sa QLayout, QWidgetItem, QLayoutItem::spacerItem()
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*/
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/*!
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\class QWidgetItem
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\ingroup geomanagement
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\brief The QWidgetItem class is a layout item that represents a widget.
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Normally, you don't need to use this class directly. Qt's
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built-in layout managers provide the following functions for
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manipulating widgets in layouts:
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\table
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\header \o Class
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\o Functions
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\row \o QBoxLayout
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\o \l{QBoxLayout::addWidget()}{addWidget()},
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\l{QBoxLayout::insertWidget()}{insertWidget()},
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\l{QBoxLayout::setStretchFactor()}{setStretchFactor()}
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\row \o QGridLayout
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\o \l{QGridLayout::addWidget()}{addWidget()}
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\row \o QStackedLayout
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\o \l{QStackedLayout::addWidget()}{addWidget()},
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\l{QStackedLayout::insertWidget()}{insertWidget()},
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\l{QStackedLayout::currentWidget()}{currentWidget()},
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\l{QStackedLayout::setCurrentWidget()}{setCurrentWidget()},
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\l{QStackedLayout::widget()}{widget()}
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\endtable
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\sa QLayout, QSpacerItem, QLayoutItem::widget()
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*/
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/*!
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\fn QLayoutItem::QLayoutItem(Qt::Alignment alignment)
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Constructs a layout item with an \a alignment.
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Not all subclasses support alignment.
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*/
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/*!
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\fn Qt::Alignment QLayoutItem::alignment() const
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Returns the alignment of this item.
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*/
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/*!
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Sets the alignment of this item to \a alignment.
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\bold{Note:} Item alignment is only supported by QLayoutItem subclasses
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where it would have a visual effect. Except for QSpacerItem, which provides
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blank space for layouts, all public Qt classes that inherit QLayoutItem
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support item alignment.
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*/
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void QLayoutItem::setAlignment(Qt::Alignment alignment)
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{
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align = alignment;
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}
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/*!
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\fn QSize QLayoutItem::maximumSize() const
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Implemented in subclasses to return the maximum size of this item.
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*/
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/*!
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\fn QSize QLayoutItem::minimumSize() const
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Implemented in subclasses to return the minimum size of this item.
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*/
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/*!
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\fn QSize QLayoutItem::sizeHint() const
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Implemented in subclasses to return the preferred size of this item.
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*/
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/*!
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\fn Qt::Orientations QLayoutItem::expandingDirections() const
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Returns whether this layout item can make use of more space than
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sizeHint(). A value of Qt::Vertical or Qt::Horizontal means that
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it wants to grow in only one dimension, whereas Qt::Vertical |
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Qt::Horizontal means that it wants to grow in both dimensions.
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*/
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/*!
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\fn void QLayoutItem::setGeometry(const QRect &r)
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Implemented in subclasses to set this item's geometry to \a r.
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\sa geometry()
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*/
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/*!
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\fn QRect QLayoutItem::geometry() const
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Returns the rectangle covered by this layout item.
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\sa setGeometry()
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*/
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/*!
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\fn virtual bool QLayoutItem::isEmpty() const
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Implemented in subclasses to return whether this item is empty,
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i.e. whether it contains any widgets.
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*/
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/*!
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\fn QSpacerItem::QSpacerItem(int w, int h, QSizePolicy::Policy hPolicy, QSizePolicy::Policy vPolicy)
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Constructs a spacer item with preferred width \a w, preferred
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height \a h, horizontal size policy \a hPolicy and vertical size
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policy \a vPolicy.
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The default values provide a gap that is able to stretch if
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nothing else wants the space.
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*/
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/*!
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Changes this spacer item to have preferred width \a w, preferred
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height \a h, horizontal size policy \a hPolicy and vertical size
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policy \a vPolicy.
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The default values provide a gap that is able to stretch if
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nothing else wants the space.
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Note that if changeSize() is called after the spacer item has been added
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to a layout, it is necessary to invalidate the layout in order for the
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spacer item's new size to take effect.
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\sa QSpacerItem::invalidate()
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*/
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void QSpacerItem::changeSize(int w, int h, QSizePolicy::Policy hPolicy,
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QSizePolicy::Policy vPolicy)
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{
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width = w;
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height = h;
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sizeP = QSizePolicy(hPolicy, vPolicy);
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}
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/*!
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\fn QWidgetItem::QWidgetItem(QWidget *widget)
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Creates an item containing the given \a widget.
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*/
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/*!
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Destroys the QLayoutItem.
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*/
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QLayoutItem::~QLayoutItem()
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{
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}
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/*!
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Invalidates any cached information in this layout item.
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*/
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void QLayoutItem::invalidate()
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{
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}
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/*!
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If this item is a QLayout, it is returned as a QLayout; otherwise
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0 is returned. This function provides type-safe casting.
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*/
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QLayout * QLayoutItem::layout()
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{
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return 0;
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}
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/*!
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If this item is a QSpacerItem, it is returned as a QSpacerItem;
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otherwise 0 is returned. This function provides type-safe casting.
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*/
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QSpacerItem * QLayoutItem::spacerItem()
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{
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return 0;
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}
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/*!
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\reimp
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*/
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QLayout * QLayout::layout()
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{
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return this;
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}
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/*!
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Returns a pointer to this object.
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*/
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QSpacerItem * QSpacerItem::spacerItem()
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{
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return this;
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}
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/*!
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If this item is a QWidget, it is returned as a QWidget; otherwise
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0 is returned. This function provides type-safe casting.
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*/
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QWidget * QLayoutItem::widget()
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{
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return 0;
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}
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/*!
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Returns the widget managed by this item.
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*/
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QWidget *QWidgetItem::widget()
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{
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return wid;
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}
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/*!
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Returns true if this layout's preferred height depends on its
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width; otherwise returns false. The default implementation returns
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false.
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Reimplement this function in layout managers that support height
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for width.
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\sa heightForWidth(), QWidget::heightForWidth()
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*/
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bool QLayoutItem::hasHeightForWidth() const
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{
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return false;
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}
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/*!
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Returns the minimum height this widget needs for the given width,
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\a w. The default implementation simply returns heightForWidth(\a
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w).
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*/
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int QLayoutItem::minimumHeightForWidth(int w) const
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{
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return heightForWidth(w);
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}
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/*!
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Returns the preferred height for this layout item, given the width
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\a w.
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The default implementation returns -1, indicating that the
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preferred height is independent of the width of the item. Using
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the function hasHeightForWidth() will typically be much faster
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than calling this function and testing for -1.
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Reimplement this function in layout managers that support height
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for width. A typical implementation will look like this:
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\snippet doc/src/snippets/code/src_gui_kernel_qlayoutitem.cpp 0
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Caching is strongly recommended; without it layout will take
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exponential time.
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\sa hasHeightForWidth()
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*/
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int QLayoutItem::heightForWidth(int /* w */) const
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{
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return -1;
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}
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/*!
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Returns the control type(s) for the layout item. For a
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QWidgetItem, the control type comes from the widget's size
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policy; for a QLayoutItem, the control types is derived from the
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layout's contents.
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\sa QSizePolicy::controlType()
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*/
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QSizePolicy::ControlTypes QLayoutItem::controlTypes() const
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{
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// ### Qt 5: This function should probably be virtual instead
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if (const QWidget *widget = const_cast<QLayoutItem*>(this)->widget()) {
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return widget->sizePolicy().controlType();
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} else if (const QLayout *layout = const_cast<QLayoutItem*>(this)->layout()) {
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if (layout->count() == 0)
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return QSizePolicy::DefaultType;
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QSizePolicy::ControlTypes types;
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for (int i = layout->count() - 1; i >= 0; --i)
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types |= layout->itemAt(i)->controlTypes();
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return types;
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}
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return QSizePolicy::DefaultType;
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}
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|
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/*!
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\reimp
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*/
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void QSpacerItem::setGeometry(const QRect &r)
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{
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rect = r;
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}
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/*!
|
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\reimp
|
|
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*/
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void QWidgetItem::setGeometry(const QRect &rect)
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{
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if (isEmpty())
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return;
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|
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QRect r = !wid->testAttribute(Qt::WA_LayoutUsesWidgetRect)
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? fromLayoutItemRect(wid->d_func(), rect)
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: rect;
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const QSize widgetRectSurplus = r.size() - rect.size();
|
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445 |
|
|
446 |
/*
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|
447 |
For historical reasons, this code is done using widget rect
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448 |
coordinates, not layout item rect coordinates. However,
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QWidgetItem's sizeHint(), maximumSize(), and heightForWidth()
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450 |
all work in terms of layout item rect coordinates, so we have to
|
|
451 |
add or subtract widgetRectSurplus here and there. The code could
|
|
452 |
be much simpler if we did everything using layout item rect
|
|
453 |
coordinates and did the conversion right before the call to
|
|
454 |
QWidget::setGeometry().
|
|
455 |
*/
|
|
456 |
|
|
457 |
QSize s = r.size().boundedTo(maximumSize() + widgetRectSurplus);
|
|
458 |
int x = r.x();
|
|
459 |
int y = r.y();
|
|
460 |
if (align & (Qt::AlignHorizontal_Mask | Qt::AlignVertical_Mask)) {
|
|
461 |
QSize pref(sizeHint());
|
|
462 |
QSizePolicy sp = wid->sizePolicy();
|
|
463 |
if (sp.horizontalPolicy() == QSizePolicy::Ignored)
|
|
464 |
pref.setWidth(wid->sizeHint().expandedTo(wid->minimumSize()).width());
|
|
465 |
if (sp.verticalPolicy() == QSizePolicy::Ignored)
|
|
466 |
pref.setHeight(wid->sizeHint().expandedTo(wid->minimumSize()).height());
|
|
467 |
pref += widgetRectSurplus;
|
|
468 |
if (align & Qt::AlignHorizontal_Mask)
|
|
469 |
s.setWidth(qMin(s.width(), pref.width()));
|
|
470 |
if (align & Qt::AlignVertical_Mask) {
|
|
471 |
if (hasHeightForWidth())
|
|
472 |
s.setHeight(qMin(s.height(),
|
|
473 |
heightForWidth(s.width() - widgetRectSurplus.width())
|
|
474 |
+ widgetRectSurplus.height()));
|
|
475 |
else
|
|
476 |
s.setHeight(qMin(s.height(), pref.height()));
|
|
477 |
}
|
|
478 |
}
|
|
479 |
Qt::Alignment alignHoriz = QStyle::visualAlignment(wid->layoutDirection(), align);
|
|
480 |
if (alignHoriz & Qt::AlignRight)
|
|
481 |
x = x + (r.width() - s.width());
|
|
482 |
else if (!(alignHoriz & Qt::AlignLeft))
|
|
483 |
x = x + (r.width() - s.width()) / 2;
|
|
484 |
|
|
485 |
if (align & Qt::AlignBottom)
|
|
486 |
y = y + (r.height() - s.height());
|
|
487 |
else if (!(align & Qt::AlignTop))
|
|
488 |
y = y + (r.height() - s.height()) / 2;
|
|
489 |
|
|
490 |
wid->setGeometry(x, y, s.width(), s.height());
|
|
491 |
}
|
|
492 |
|
|
493 |
/*!
|
|
494 |
\reimp
|
|
495 |
*/
|
|
496 |
QRect QSpacerItem::geometry() const
|
|
497 |
{
|
|
498 |
return rect;
|
|
499 |
}
|
|
500 |
|
|
501 |
/*!
|
|
502 |
\reimp
|
|
503 |
*/
|
|
504 |
QRect QWidgetItem::geometry() const
|
|
505 |
{
|
|
506 |
return !wid->testAttribute(Qt::WA_LayoutUsesWidgetRect)
|
|
507 |
? toLayoutItemRect(wid->d_func(), wid->geometry())
|
|
508 |
: wid->geometry();
|
|
509 |
}
|
|
510 |
|
|
511 |
|
|
512 |
/*!
|
|
513 |
\reimp
|
|
514 |
*/
|
|
515 |
bool QWidgetItem::hasHeightForWidth() const
|
|
516 |
{
|
|
517 |
if (isEmpty())
|
|
518 |
return false;
|
|
519 |
if (wid->layout())
|
|
520 |
return wid->layout()->hasHeightForWidth();
|
|
521 |
return wid->sizePolicy().hasHeightForWidth();
|
|
522 |
}
|
|
523 |
|
|
524 |
/*!
|
|
525 |
\reimp
|
|
526 |
*/
|
|
527 |
int QWidgetItem::heightForWidth(int w) const
|
|
528 |
{
|
|
529 |
if (isEmpty())
|
|
530 |
return -1;
|
|
531 |
|
|
532 |
w = !wid->testAttribute(Qt::WA_LayoutUsesWidgetRect)
|
|
533 |
? fromLayoutItemSize(wid->d_func(), QSize(w, 0)).width()
|
|
534 |
: w;
|
|
535 |
|
|
536 |
int hfw;
|
|
537 |
if (wid->layout())
|
|
538 |
hfw = wid->layout()->totalHeightForWidth(w);
|
|
539 |
else
|
|
540 |
hfw = wid->heightForWidth(w);
|
|
541 |
|
|
542 |
if (hfw > wid->maximumHeight())
|
|
543 |
hfw = wid->maximumHeight();
|
|
544 |
if (hfw < wid->minimumHeight())
|
|
545 |
hfw = wid->minimumHeight();
|
|
546 |
|
|
547 |
hfw = !wid->testAttribute(Qt::WA_LayoutUsesWidgetRect)
|
|
548 |
? toLayoutItemSize(wid->d_func(), QSize(0, hfw)).height()
|
|
549 |
: hfw;
|
|
550 |
|
|
551 |
if (hfw < 0)
|
|
552 |
hfw = 0;
|
|
553 |
return hfw;
|
|
554 |
}
|
|
555 |
|
|
556 |
/*!
|
|
557 |
\reimp
|
|
558 |
*/
|
|
559 |
Qt::Orientations QSpacerItem::expandingDirections() const
|
|
560 |
{
|
|
561 |
return sizeP.expandingDirections();
|
|
562 |
}
|
|
563 |
|
|
564 |
/*!
|
|
565 |
\reimp
|
|
566 |
*/
|
|
567 |
Qt::Orientations QWidgetItem::expandingDirections() const
|
|
568 |
{
|
|
569 |
if (isEmpty())
|
|
570 |
return Qt::Orientations(0);
|
|
571 |
|
|
572 |
Qt::Orientations e = wid->sizePolicy().expandingDirections();
|
|
573 |
/*
|
|
574 |
### Qt 4.0:
|
|
575 |
If the layout is expanding, we make the widget expanding, even if
|
|
576 |
its own size policy isn't expanding. This behavior should be
|
|
577 |
reconsidered.
|
|
578 |
*/
|
|
579 |
if (wid->layout()) {
|
|
580 |
if (wid->sizePolicy().horizontalPolicy() & QSizePolicy::GrowFlag
|
|
581 |
&& (wid->layout()->expandingDirections() & Qt::Horizontal))
|
|
582 |
e |= Qt::Horizontal;
|
|
583 |
if (wid->sizePolicy().verticalPolicy() & QSizePolicy::GrowFlag
|
|
584 |
&& (wid->layout()->expandingDirections() & Qt::Vertical))
|
|
585 |
e |= Qt::Vertical;
|
|
586 |
}
|
|
587 |
|
|
588 |
if (align & Qt::AlignHorizontal_Mask)
|
|
589 |
e &= ~Qt::Horizontal;
|
|
590 |
if (align & Qt::AlignVertical_Mask)
|
|
591 |
e &= ~Qt::Vertical;
|
|
592 |
return e;
|
|
593 |
}
|
|
594 |
|
|
595 |
/*!
|
|
596 |
\reimp
|
|
597 |
*/
|
|
598 |
QSize QSpacerItem::minimumSize() const
|
|
599 |
{
|
|
600 |
return QSize(sizeP.horizontalPolicy() & QSizePolicy::ShrinkFlag ? 0 : width,
|
|
601 |
sizeP.verticalPolicy() & QSizePolicy::ShrinkFlag ? 0 : height);
|
|
602 |
}
|
|
603 |
|
|
604 |
/*!
|
|
605 |
\reimp
|
|
606 |
*/
|
|
607 |
QSize QWidgetItem::minimumSize() const
|
|
608 |
{
|
|
609 |
if (isEmpty())
|
|
610 |
return QSize(0, 0);
|
|
611 |
return !wid->testAttribute(Qt::WA_LayoutUsesWidgetRect)
|
|
612 |
? toLayoutItemSize(wid->d_func(), qSmartMinSize(this))
|
|
613 |
: qSmartMinSize(this);
|
|
614 |
}
|
|
615 |
|
|
616 |
/*!
|
|
617 |
\reimp
|
|
618 |
*/
|
|
619 |
QSize QSpacerItem::maximumSize() const
|
|
620 |
{
|
|
621 |
return QSize(sizeP.horizontalPolicy() & QSizePolicy::GrowFlag ? QLAYOUTSIZE_MAX : width,
|
|
622 |
sizeP.verticalPolicy() & QSizePolicy::GrowFlag ? QLAYOUTSIZE_MAX : height);
|
|
623 |
}
|
|
624 |
|
|
625 |
/*!
|
|
626 |
\reimp
|
|
627 |
*/
|
|
628 |
QSize QWidgetItem::maximumSize() const
|
|
629 |
{
|
|
630 |
if (isEmpty()) {
|
|
631 |
return QSize(0, 0);
|
|
632 |
} else {
|
|
633 |
return !wid->testAttribute(Qt::WA_LayoutUsesWidgetRect)
|
|
634 |
? toLayoutItemSize(wid->d_func(), qSmartMaxSize(this, align))
|
|
635 |
: qSmartMaxSize(this, align);
|
|
636 |
}
|
|
637 |
}
|
|
638 |
|
|
639 |
/*!
|
|
640 |
\reimp
|
|
641 |
*/
|
|
642 |
QSize QSpacerItem::sizeHint() const
|
|
643 |
{
|
|
644 |
return QSize(width, height);
|
|
645 |
}
|
|
646 |
|
|
647 |
/*!
|
|
648 |
\reimp
|
|
649 |
*/
|
|
650 |
QSize QWidgetItem::sizeHint() const
|
|
651 |
{
|
|
652 |
QSize s(0, 0);
|
|
653 |
if (!isEmpty()) {
|
|
654 |
s = wid->sizeHint().expandedTo(wid->minimumSizeHint());
|
|
655 |
s = s.boundedTo(wid->maximumSize())
|
|
656 |
.expandedTo(wid->minimumSize());
|
|
657 |
s = !wid->testAttribute(Qt::WA_LayoutUsesWidgetRect)
|
|
658 |
? toLayoutItemSize(wid->d_func(), s)
|
|
659 |
: s;
|
|
660 |
|
|
661 |
if (wid->sizePolicy().horizontalPolicy() == QSizePolicy::Ignored)
|
|
662 |
s.setWidth(0);
|
|
663 |
if (wid->sizePolicy().verticalPolicy() == QSizePolicy::Ignored)
|
|
664 |
s.setHeight(0);
|
|
665 |
}
|
|
666 |
return s;
|
|
667 |
}
|
|
668 |
|
|
669 |
/*!
|
|
670 |
Returns true.
|
|
671 |
*/
|
|
672 |
bool QSpacerItem::isEmpty() const
|
|
673 |
{
|
|
674 |
return true;
|
|
675 |
}
|
|
676 |
|
|
677 |
/*!
|
|
678 |
Returns true if the widget is hidden; otherwise returns false.
|
|
679 |
|
|
680 |
\sa QWidget::isHidden()
|
|
681 |
*/
|
|
682 |
bool QWidgetItem::isEmpty() const
|
|
683 |
{
|
|
684 |
return wid->isHidden() || wid->isWindow();
|
|
685 |
}
|
|
686 |
|
|
687 |
/*!
|
|
688 |
\class QWidgetItemV2
|
|
689 |
\internal
|
|
690 |
*/
|
|
691 |
|
|
692 |
inline bool QWidgetItemV2::useSizeCache() const
|
|
693 |
{
|
|
694 |
return wid->d_func()->widgetItem == this;
|
|
695 |
}
|
|
696 |
|
|
697 |
void QWidgetItemV2::updateCacheIfNecessary() const
|
|
698 |
{
|
|
699 |
if (q_cachedMinimumSize.width() != Dirty)
|
|
700 |
return;
|
|
701 |
|
|
702 |
const QSize sizeHint(wid->sizeHint());
|
|
703 |
const QSize minimumSizeHint(wid->minimumSizeHint());
|
|
704 |
const QSize minimumSize(wid->minimumSize());
|
|
705 |
const QSize maximumSize(wid->maximumSize());
|
|
706 |
const QSizePolicy sizePolicy(wid->sizePolicy());
|
|
707 |
const QSize expandedSizeHint(sizeHint.expandedTo(minimumSizeHint));
|
|
708 |
|
|
709 |
const QSize smartMinSize(qSmartMinSize(sizeHint, minimumSizeHint, minimumSize, maximumSize, sizePolicy));
|
|
710 |
const QSize smartMaxSize(qSmartMaxSize(expandedSizeHint, minimumSize, maximumSize, sizePolicy, align));
|
|
711 |
|
|
712 |
const bool useLayoutItemRect = !wid->testAttribute(Qt::WA_LayoutUsesWidgetRect);
|
|
713 |
|
|
714 |
q_cachedMinimumSize = useLayoutItemRect
|
|
715 |
? toLayoutItemSize(wid->d_func(), smartMinSize)
|
|
716 |
: smartMinSize;
|
|
717 |
|
|
718 |
q_cachedSizeHint = expandedSizeHint;
|
|
719 |
q_cachedSizeHint = q_cachedSizeHint.boundedTo(maximumSize)
|
|
720 |
.expandedTo(minimumSize);
|
|
721 |
q_cachedSizeHint = useLayoutItemRect
|
|
722 |
? toLayoutItemSize(wid->d_func(), q_cachedSizeHint)
|
|
723 |
: q_cachedSizeHint;
|
|
724 |
|
|
725 |
if (wid->sizePolicy().horizontalPolicy() == QSizePolicy::Ignored)
|
|
726 |
q_cachedSizeHint.setWidth(0);
|
|
727 |
if (wid->sizePolicy().verticalPolicy() == QSizePolicy::Ignored)
|
|
728 |
q_cachedSizeHint.setHeight(0);
|
|
729 |
|
|
730 |
q_cachedMaximumSize = useLayoutItemRect
|
|
731 |
? toLayoutItemSize(wid->d_func(), smartMaxSize)
|
|
732 |
: smartMaxSize;
|
|
733 |
}
|
|
734 |
|
|
735 |
QWidgetItemV2::QWidgetItemV2(QWidget *widget)
|
|
736 |
: QWidgetItem(widget),
|
|
737 |
q_cachedMinimumSize(Dirty, Dirty),
|
|
738 |
q_cachedSizeHint(Dirty, Dirty),
|
|
739 |
q_cachedMaximumSize(Dirty, Dirty),
|
|
740 |
q_firstCachedHfw(0),
|
|
741 |
q_hfwCacheSize(0),
|
|
742 |
d(0)
|
|
743 |
{
|
|
744 |
QWidgetPrivate *wd = wid->d_func();
|
|
745 |
if (!wd->widgetItem)
|
|
746 |
wd->widgetItem = this;
|
|
747 |
}
|
|
748 |
|
|
749 |
QWidgetItemV2::~QWidgetItemV2()
|
|
750 |
{
|
|
751 |
if (wid) {
|
|
752 |
QWidgetPrivate *wd = wid->d_func();
|
|
753 |
if (wd->widgetItem == this)
|
|
754 |
wd->widgetItem = 0;
|
|
755 |
}
|
|
756 |
}
|
|
757 |
|
|
758 |
QSize QWidgetItemV2::sizeHint() const
|
|
759 |
{
|
|
760 |
if (isEmpty())
|
|
761 |
return QSize(0, 0);
|
|
762 |
|
|
763 |
if (useSizeCache()) {
|
|
764 |
updateCacheIfNecessary();
|
|
765 |
return q_cachedSizeHint;
|
|
766 |
} else {
|
|
767 |
return QWidgetItem::sizeHint();
|
|
768 |
}
|
|
769 |
}
|
|
770 |
|
|
771 |
QSize QWidgetItemV2::minimumSize() const
|
|
772 |
{
|
|
773 |
if (isEmpty())
|
|
774 |
return QSize(0, 0);
|
|
775 |
|
|
776 |
if (useSizeCache()) {
|
|
777 |
updateCacheIfNecessary();
|
|
778 |
return q_cachedMinimumSize;
|
|
779 |
} else {
|
|
780 |
return QWidgetItem::minimumSize();
|
|
781 |
}
|
|
782 |
}
|
|
783 |
|
|
784 |
QSize QWidgetItemV2::maximumSize() const
|
|
785 |
{
|
|
786 |
if (isEmpty())
|
|
787 |
return QSize(0, 0);
|
|
788 |
|
|
789 |
if (useSizeCache()) {
|
|
790 |
updateCacheIfNecessary();
|
|
791 |
return q_cachedMaximumSize;
|
|
792 |
} else {
|
|
793 |
return QWidgetItem::maximumSize();
|
|
794 |
}
|
|
795 |
}
|
|
796 |
|
|
797 |
/*
|
|
798 |
The height-for-width cache is organized as a circular buffer. The entries
|
|
799 |
|
|
800 |
q_hfwCachedHfws[q_firstCachedHfw],
|
|
801 |
...,
|
|
802 |
q_hfwCachedHfws[(q_firstCachedHfw + q_hfwCacheSize - 1) % HfwCacheMaxSize]
|
|
803 |
|
|
804 |
contain the last cached values. When the cache is full, the first entry to
|
|
805 |
be erased is the entry before q_hfwCachedHfws[q_firstCachedHfw]. When
|
|
806 |
values are looked up, we try to move q_firstCachedHfw to point to that new
|
|
807 |
entry (unless the cache is not full, in which case it would leave the cache
|
|
808 |
in a broken state), so that the most recently used entry is also the last
|
|
809 |
to be erased.
|
|
810 |
*/
|
|
811 |
|
|
812 |
int QWidgetItemV2::heightForWidth(int width) const
|
|
813 |
{
|
|
814 |
if (isEmpty())
|
|
815 |
return -1;
|
|
816 |
|
|
817 |
for (int i = 0; i < q_hfwCacheSize; ++i) {
|
|
818 |
int offset = q_firstCachedHfw + i;
|
|
819 |
const QSize &size = q_cachedHfws[offset % HfwCacheMaxSize];
|
|
820 |
if (size.width() == width) {
|
|
821 |
if (q_hfwCacheSize == HfwCacheMaxSize)
|
|
822 |
q_firstCachedHfw = offset;
|
|
823 |
return size.height();
|
|
824 |
}
|
|
825 |
}
|
|
826 |
|
|
827 |
if (q_hfwCacheSize < HfwCacheMaxSize)
|
|
828 |
++q_hfwCacheSize;
|
|
829 |
q_firstCachedHfw = (q_firstCachedHfw + HfwCacheMaxSize - 1) % HfwCacheMaxSize;
|
|
830 |
|
|
831 |
int height = QWidgetItem::heightForWidth(width);
|
|
832 |
q_cachedHfws[q_firstCachedHfw] = QSize(width, height);
|
|
833 |
return height;
|
|
834 |
}
|
|
835 |
|
|
836 |
QT_END_NAMESPACE
|