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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 "qglobal.h"
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#ifndef QT_NO_GRAPHICSVIEW
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#include "qgraphicslayout.h"
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#include "qgraphicsscene.h"
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#include "qgraphicslayoutitem.h"
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#include "qgraphicslayoutitem_p.h"
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#include "qwidget.h"
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#include <QtDebug>
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QT_BEGIN_NAMESPACE
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/*
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COMBINE_SIZE() is identical to combineSize(), except that it
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doesn't evaluate 'size' unless necessary.
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*/
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#define COMBINE_SIZE(result, size) \
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do { \
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if ((result).width() < 0 || (result).height() < 0) \
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combineSize((result), (size)); \
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} while (false)
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static void combineSize(QSizeF &result, const QSizeF &size)
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{
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if (result.width() < 0)
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result.setWidth(size.width());
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if (result.height() < 0)
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result.setHeight(size.height());
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}
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static void boundSize(QSizeF &result, const QSizeF &size)
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{
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if (size.width() >= 0 && size.width() < result.width())
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result.setWidth(size.width());
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if (size.height() >= 0 && size.height() < result.height())
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result.setHeight(size.height());
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}
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static void expandSize(QSizeF &result, const QSizeF &size)
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{
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if (size.width() >= 0 && size.width() > result.width())
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result.setWidth(size.width());
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if (size.height() >= 0 && size.height() > result.height())
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result.setHeight(size.height());
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}
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static void normalizeHints(qreal &minimum, qreal &preferred, qreal &maximum, qreal &descent)
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{
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if (minimum >= 0 && maximum >= 0 && minimum > maximum)
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minimum = maximum;
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if (preferred >= 0) {
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if (minimum >= 0 && preferred < minimum) {
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preferred = minimum;
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} else if (maximum >= 0 && preferred > maximum) {
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preferred = maximum;
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}
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}
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if (minimum >= 0 && descent > minimum)
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descent = minimum;
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}
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/*!
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\internal
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*/
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QGraphicsLayoutItemPrivate::QGraphicsLayoutItemPrivate(QGraphicsLayoutItem *par, bool layout)
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: parent(par), userSizeHints(0), isLayout(layout), ownedByLayout(false), graphicsItem(0)
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{
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}
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/*!
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\internal
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*/
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QGraphicsLayoutItemPrivate::~QGraphicsLayoutItemPrivate()
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{
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// Remove any lazily allocated data
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delete[] userSizeHints;
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}
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/*!
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\internal
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*/
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void QGraphicsLayoutItemPrivate::init()
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{
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sizeHintCacheDirty = true;
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sizePolicy = QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
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}
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/*!
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\internal
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*/
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QSizeF *QGraphicsLayoutItemPrivate::effectiveSizeHints(const QSizeF &constraint) const
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{
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Q_Q(const QGraphicsLayoutItem);
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if (!sizeHintCacheDirty && cachedConstraint == constraint)
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return cachedSizeHints;
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for (int i = 0; i < Qt::NSizeHints; ++i) {
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cachedSizeHints[i] = constraint;
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if (userSizeHints)
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combineSize(cachedSizeHints[i], userSizeHints[i]);
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}
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QSizeF &minS = cachedSizeHints[Qt::MinimumSize];
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QSizeF &prefS = cachedSizeHints[Qt::PreferredSize];
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QSizeF &maxS = cachedSizeHints[Qt::MaximumSize];
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QSizeF &descentS = cachedSizeHints[Qt::MinimumDescent];
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normalizeHints(minS.rwidth(), prefS.rwidth(), maxS.rwidth(), descentS.rwidth());
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normalizeHints(minS.rheight(), prefS.rheight(), maxS.rheight(), descentS.rheight());
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// if the minimum, preferred and maximum sizes contradict each other
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// (e.g. the minimum is larger than the maximum) we give priority to
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// the maximum size, then the minimum size and finally the preferred size
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COMBINE_SIZE(maxS, q->sizeHint(Qt::MaximumSize, maxS));
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combineSize(maxS, QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX));
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expandSize(maxS, prefS);
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expandSize(maxS, minS);
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boundSize(maxS, QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX));
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COMBINE_SIZE(minS, q->sizeHint(Qt::MinimumSize, minS));
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expandSize(minS, QSizeF(0, 0));
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boundSize(minS, prefS);
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boundSize(minS, maxS);
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COMBINE_SIZE(prefS, q->sizeHint(Qt::PreferredSize, prefS));
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expandSize(prefS, minS);
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boundSize(prefS, maxS);
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// Not supported yet
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// COMBINE_SIZE(descentS, q->sizeHint(Qt::MinimumDescent, constraint));
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cachedConstraint = constraint;
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sizeHintCacheDirty = false;
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return cachedSizeHints;
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}
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/*!
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\internal
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Returns the parent item of this layout, or 0 if this layout is
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not installed on any widget.
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If this is the item that the layout is installed on, it will return "itself".
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If the layout is a sub-layout, this function returns the parent
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widget of the parent layout.
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Note that it will traverse up the layout item hierarchy instead of just calling
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QGraphicsItem::parentItem(). This is on purpose.
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\sa parent()
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*/
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QGraphicsItem *QGraphicsLayoutItemPrivate::parentItem() const
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{
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Q_Q(const QGraphicsLayoutItem);
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const QGraphicsLayoutItem *parent = q;
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while (parent && parent->isLayout()) {
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parent = parent->parentLayoutItem();
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}
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return parent ? parent->graphicsItem() : 0;
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}
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/*!
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\internal
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Ensures that userSizeHints is allocated.
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This function must be called before any dereferencing.
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*/
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void QGraphicsLayoutItemPrivate::ensureUserSizeHints()
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{
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if (!userSizeHints)
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userSizeHints = new QSizeF[Qt::NSizeHints];
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}
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/*!
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\internal
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Sets the user size hint \a which to \a size. Use an invalid size to unset the size hint.
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*/
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void QGraphicsLayoutItemPrivate::setSize(Qt::SizeHint which, const QSizeF &size)
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{
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Q_Q(QGraphicsLayoutItem);
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if (userSizeHints) {
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if (size == userSizeHints[which])
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return;
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} else if (!size.isValid()) {
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return;
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}
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ensureUserSizeHints();
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userSizeHints[which] = size;
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q->updateGeometry();
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}
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/*!
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\internal
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Sets the width of the user size hint \a which to \a width.
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*/
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void QGraphicsLayoutItemPrivate::setSizeComponent(
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Qt::SizeHint which, SizeComponent component, qreal value)
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{
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Q_Q(QGraphicsLayoutItem);
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ensureUserSizeHints();
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qreal &userValue = (component == Width)
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? userSizeHints[which].rwidth()
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: userSizeHints[which].rheight();
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if (value == userValue)
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return;
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userValue = value;
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q->updateGeometry();
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}
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/*!
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\class QGraphicsLayoutItem
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\brief The QGraphicsLayoutItem class can be inherited to allow your custom
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items to be managed by layouts.
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\since 4.4
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\ingroup graphicsview-api
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QGraphicsLayoutItem is an abstract class that defines a set of virtual
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functions describing sizes, size policies, and size hints for any object
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arranged by QGraphicsLayout. The API contains functions relevant
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for both the item itself and for the user of the item as most of
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QGraphicsLayoutItem's functions are also part of the subclass' public API.
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In most cases, existing layout-aware classes such as QGraphicsWidget and
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QGraphicsLayout already provide the functionality you require. However,
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subclassing these classes will enable you to create both graphical
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elements that work well with layouts (QGraphicsWidget) or custom layouts
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(QGraphicsLayout).
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\section1 Subclassing QGraphicsLayoutItem
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If you create a subclass of QGraphicsLayoutItem and reimplement its
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virtual functions, you will enable the layout to resize and position your
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item along with other QGraphicsLayoutItems including QGraphicsWidget
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and QGraphicsLayout.
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You can start by reimplementing important functions: the protected
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sizeHint() function, as well as the public setGeometry()
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function. If you want your items to be aware of immediate geometry
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changes, you can also reimplement updateGeometry().
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The geometry, size hint, and size policy affect the item's size and
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position. Calling setGeometry() will always resize and reposition the item
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immediately. Normally, this function is called by QGraphicsLayout after
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the layout has been activated, but it can also be called by the item's user
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at any time.
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The sizeHint() function returns the item' minimum, preferred and maximum
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size hints. You can override these properties by calling setMinimumSize(),
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setPreferredSize() or setMaximumSize(). You can also use functions such as
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setMinimumWidth() or setMaximumHeight() to set only the width or height
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component if desired.
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The effectiveSizeHint() function, on the other hand, returns a size hint
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for any given Qt::SizeHint, and guarantees that the returned size is bound
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to the minimum and maximum sizes and size hints. You can set the item's
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vertical and horizontal size policy by calling setSizePolicy(). The
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sizePolicy property is used by the layout system to describe how this item
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prefers to grow or shrink.
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\section1 Nesting QGraphicsLayoutItems
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QGraphicsLayoutItems can be nested within other QGraphicsLayoutItems,
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similar to layouts that can contain sublayouts. This is done either by
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passing a QGraphicsLayoutItem pointer to QGraphicsLayoutItem's
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protected constructor, or by calling setParentLayoutItem(). The
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parentLayoutItem() function returns a pointer to the item's layoutItem
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parent. If the item's parent is 0 or if the parent does not inherit
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from QGraphicsItem, the parentLayoutItem() function then returns 0.
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isLayout() returns true if the QGraphicsLayoutItem subclass is itself a
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layout, or false otherwise.
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Qt uses QGraphicsLayoutItem to provide layout functionality in the
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\l{The Graphics View Framework}, but in the future its use may spread
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throughout Qt itself.
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\sa QGraphicsWidget, QGraphicsLayout, QGraphicsLinearLayout,
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QGraphicsGridLayout
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*/
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/*!
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Constructs the QGraphicsLayoutItem object. \a parent becomes the object's
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parent. If \a isLayout is true the item is a layout, otherwise
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\a isLayout is false.
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*/
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QGraphicsLayoutItem::QGraphicsLayoutItem(QGraphicsLayoutItem *parent, bool isLayout)
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: d_ptr(new QGraphicsLayoutItemPrivate(parent, isLayout))
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{
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Q_D(QGraphicsLayoutItem);
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d->init();
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d->q_ptr = this;
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}
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/*!
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\internal
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*/
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QGraphicsLayoutItem::QGraphicsLayoutItem(QGraphicsLayoutItemPrivate &dd)
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: d_ptr(&dd)
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{
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Q_D(QGraphicsLayoutItem);
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d->q_ptr = this;
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}
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/*!
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Destroys the QGraphicsLayoutItem object.
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*/
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QGraphicsLayoutItem::~QGraphicsLayoutItem()
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{
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QGraphicsLayoutItem *parentLI = parentLayoutItem();
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if (parentLI && parentLI->isLayout()) {
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QGraphicsLayout *lay = static_cast<QGraphicsLayout*>(parentLI);
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// this is not optimal
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for (int i = lay->count() - 1; i >= 0; --i) {
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if (lay->itemAt(i) == this) {
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lay->removeAt(i);
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break;
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}
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}
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}
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}
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/*!
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\fn virtual QSizeF QGraphicsLayoutItem::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const = 0;
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This pure virtual function returns the size hint for \a which of the
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QGraphicsLayoutItem, using the width or height of \a constraint to
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constrain the output.
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Reimplement this function in a subclass of QGraphicsLayoutItem to
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provide the necessary size hints for your items.
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\sa effectiveSizeHint()
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*/
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/*!
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Sets the size policy to \a policy. The size policy describes how the item
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should grow horizontally and vertically when arranged in a layout.
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QGraphicsLayoutItem's default size policy is (QSizePolicy::Fixed,
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QSizePolicy::Fixed, QSizePolicy::DefaultType), but it is common for
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subclasses to change the default. For example, QGraphicsWidget defaults
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to (QSizePolicy::Preferred, QSizePolicy::Preferred,
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QSizePolicy::DefaultType).
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\sa sizePolicy(), QWidget::sizePolicy()
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*/
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void QGraphicsLayoutItem::setSizePolicy(const QSizePolicy &policy)
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{
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Q_D(QGraphicsLayoutItem);
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if (d->sizePolicy == policy)
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return;
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d->sizePolicy = policy;
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updateGeometry();
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}
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|
|
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/*!
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\overload
|
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409 |
|
|
410 |
This function is equivalent to calling
|
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setSizePolicy(QSizePolicy(\a hPolicy, \a vPolicy, \a controlType)).
|
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412 |
|
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\sa sizePolicy(), QWidget::sizePolicy()
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|
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*/
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void QGraphicsLayoutItem::setSizePolicy(QSizePolicy::Policy hPolicy,
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|
416 |
QSizePolicy::Policy vPolicy,
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QSizePolicy::ControlType controlType)
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{
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setSizePolicy(QSizePolicy(hPolicy, vPolicy, controlType));
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|
420 |
}
|
|
421 |
|
|
422 |
/*!
|
|
423 |
Returns the current size policy.
|
|
424 |
|
|
425 |
\sa setSizePolicy(), QWidget::sizePolicy()
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|
426 |
*/
|
|
427 |
QSizePolicy QGraphicsLayoutItem::sizePolicy() const
|
|
428 |
{
|
|
429 |
Q_D(const QGraphicsLayoutItem);
|
|
430 |
return d->sizePolicy;
|
|
431 |
}
|
|
432 |
|
|
433 |
/*!
|
|
434 |
Sets the minimum size to \a size. This property overrides sizeHint() for
|
|
435 |
Qt::MinimumSize and ensures that effectiveSizeHint() will never return
|
|
436 |
a size smaller than \a size. In order to unset the minimum size, use an
|
|
437 |
invalid size.
|
|
438 |
|
|
439 |
\sa minimumSize(), maximumSize(), preferredSize(), Qt::MinimumSize,
|
|
440 |
sizeHint(), setMinimumWidth(), setMinimumHeight()
|
|
441 |
*/
|
|
442 |
void QGraphicsLayoutItem::setMinimumSize(const QSizeF &size)
|
|
443 |
{
|
|
444 |
d_ptr->setSize(Qt::MinimumSize, size);
|
|
445 |
}
|
|
446 |
|
|
447 |
/*!
|
|
448 |
\fn QGraphicsLayoutItem::setMinimumSize(qreal w, qreal h)
|
|
449 |
|
|
450 |
This convenience function is equivalent to calling
|
|
451 |
setMinimumSize(QSizeF(\a w, \a h)).
|
|
452 |
|
|
453 |
\sa minimumSize(), setMaximumSize(), setPreferredSize(), sizeHint()
|
|
454 |
*/
|
|
455 |
|
|
456 |
/*!
|
|
457 |
Returns the minimum size.
|
|
458 |
|
|
459 |
\sa setMinimumSize(), preferredSize(), maximumSize(), Qt::MinimumSize,
|
|
460 |
sizeHint()
|
|
461 |
*/
|
|
462 |
QSizeF QGraphicsLayoutItem::minimumSize() const
|
|
463 |
{
|
|
464 |
return effectiveSizeHint(Qt::MinimumSize);
|
|
465 |
}
|
|
466 |
|
|
467 |
/*!
|
|
468 |
Sets the minimum width to \a width.
|
|
469 |
|
|
470 |
\sa minimumWidth(), setMinimumSize(), minimumSize()
|
|
471 |
*/
|
|
472 |
void QGraphicsLayoutItem::setMinimumWidth(qreal width)
|
|
473 |
{
|
|
474 |
d_ptr->setSizeComponent(Qt::MinimumSize, d_ptr->Width, width);
|
|
475 |
}
|
|
476 |
|
|
477 |
/*!
|
|
478 |
Sets the minimum height to \a height.
|
|
479 |
|
|
480 |
\sa minimumHeight(), setMinimumSize(), minimumSize()
|
|
481 |
*/
|
|
482 |
void QGraphicsLayoutItem::setMinimumHeight(qreal height)
|
|
483 |
{
|
|
484 |
d_ptr->setSizeComponent(Qt::MinimumSize, d_ptr->Height, height);
|
|
485 |
}
|
|
486 |
|
|
487 |
|
|
488 |
/*!
|
|
489 |
Sets the preferred size to \a size. This property overrides sizeHint() for
|
|
490 |
Qt::PreferredSize and provides the default value for effectiveSizeHint().
|
|
491 |
In order to unset the preferred size, use an invalid size.
|
|
492 |
|
|
493 |
\sa preferredSize(), minimumSize(), maximumSize(), Qt::PreferredSize,
|
|
494 |
sizeHint()
|
|
495 |
*/
|
|
496 |
void QGraphicsLayoutItem::setPreferredSize(const QSizeF &size)
|
|
497 |
{
|
|
498 |
d_ptr->setSize(Qt::PreferredSize, size);
|
|
499 |
}
|
|
500 |
|
|
501 |
/*!
|
|
502 |
\fn QGraphicsLayoutItem::setPreferredSize(qreal w, qreal h)
|
|
503 |
|
|
504 |
This convenience function is equivalent to calling
|
|
505 |
setPreferredSize(QSizeF(\a w, \a h)).
|
|
506 |
|
|
507 |
\sa preferredSize(), setMaximumSize(), setMinimumSize(), sizeHint()
|
|
508 |
*/
|
|
509 |
|
|
510 |
/*!
|
|
511 |
Returns the preferred size.
|
|
512 |
|
|
513 |
\sa setPreferredSize(), minimumSize(), maximumSize(), Qt::PreferredSize,
|
|
514 |
sizeHint()
|
|
515 |
*/
|
|
516 |
QSizeF QGraphicsLayoutItem::preferredSize() const
|
|
517 |
{
|
|
518 |
return effectiveSizeHint(Qt::PreferredSize);
|
|
519 |
}
|
|
520 |
|
|
521 |
/*!
|
|
522 |
Sets the preferred height to \a height.
|
|
523 |
|
|
524 |
\sa preferredWidth(), setPreferredSize(), preferredSize()
|
|
525 |
*/
|
|
526 |
void QGraphicsLayoutItem::setPreferredHeight(qreal height)
|
|
527 |
{
|
|
528 |
d_ptr->setSizeComponent(Qt::PreferredSize, d_ptr->Height, height);
|
|
529 |
}
|
|
530 |
|
|
531 |
/*!
|
|
532 |
Sets the preferred width to \a width.
|
|
533 |
|
|
534 |
\sa preferredHeight(), setPreferredSize(), preferredSize()
|
|
535 |
*/
|
|
536 |
void QGraphicsLayoutItem::setPreferredWidth(qreal width)
|
|
537 |
{
|
|
538 |
d_ptr->setSizeComponent(Qt::PreferredSize, d_ptr->Width, width);
|
|
539 |
}
|
|
540 |
|
|
541 |
/*!
|
|
542 |
Sets the maximum size to \a size. This property overrides sizeHint() for
|
|
543 |
Qt::MaximumSize and ensures that effectiveSizeHint() will never return a
|
|
544 |
size larger than \a size. In order to unset the maximum size, use an
|
|
545 |
invalid size.
|
|
546 |
|
|
547 |
\sa maximumSize(), minimumSize(), preferredSize(), Qt::MaximumSize,
|
|
548 |
sizeHint()
|
|
549 |
*/
|
|
550 |
void QGraphicsLayoutItem::setMaximumSize(const QSizeF &size)
|
|
551 |
{
|
|
552 |
d_ptr->setSize(Qt::MaximumSize, size);
|
|
553 |
}
|
|
554 |
|
|
555 |
/*!
|
|
556 |
\fn QGraphicsLayoutItem::setMaximumSize(qreal w, qreal h)
|
|
557 |
|
|
558 |
This convenience function is equivalent to calling
|
|
559 |
setMaximumSize(QSizeF(\a w, \a h)).
|
|
560 |
|
|
561 |
\sa maximumSize(), setMinimumSize(), setPreferredSize(), sizeHint()
|
|
562 |
*/
|
|
563 |
|
|
564 |
/*!
|
|
565 |
Returns the maximum size.
|
|
566 |
|
|
567 |
\sa setMaximumSize(), minimumSize(), preferredSize(), Qt::MaximumSize,
|
|
568 |
sizeHint()
|
|
569 |
*/
|
|
570 |
QSizeF QGraphicsLayoutItem::maximumSize() const
|
|
571 |
{
|
|
572 |
return effectiveSizeHint(Qt::MaximumSize);
|
|
573 |
}
|
|
574 |
|
|
575 |
/*!
|
|
576 |
Sets the maximum width to \a width.
|
|
577 |
|
|
578 |
\sa maximumWidth(), setMaximumSize(), maximumSize()
|
|
579 |
*/
|
|
580 |
void QGraphicsLayoutItem::setMaximumWidth(qreal width)
|
|
581 |
{
|
|
582 |
d_ptr->setSizeComponent(Qt::MaximumSize, d_ptr->Width, width);
|
|
583 |
}
|
|
584 |
|
|
585 |
/*!
|
|
586 |
Sets the maximum height to \a height.
|
|
587 |
|
|
588 |
\sa maximumHeight(), setMaximumSize(), maximumSize()
|
|
589 |
*/
|
|
590 |
void QGraphicsLayoutItem::setMaximumHeight(qreal height)
|
|
591 |
{
|
|
592 |
d_ptr->setSizeComponent(Qt::MaximumSize, d_ptr->Height, height);
|
|
593 |
}
|
|
594 |
|
|
595 |
/*!
|
|
596 |
\fn qreal QGraphicsLayoutItem::minimumWidth() const
|
|
597 |
|
|
598 |
Returns the minimum width.
|
|
599 |
|
|
600 |
\sa setMinimumWidth(), setMinimumSize(), minimumSize()
|
|
601 |
*/
|
|
602 |
|
|
603 |
/*!
|
|
604 |
\fn qreal QGraphicsLayoutItem::minimumHeight() const
|
|
605 |
|
|
606 |
Returns the minimum height.
|
|
607 |
|
|
608 |
\sa setMinimumHeight(), setMinimumSize(), minimumSize()
|
|
609 |
*/
|
|
610 |
|
|
611 |
/*!
|
|
612 |
\fn qreal QGraphicsLayoutItem::preferredWidth() const
|
|
613 |
|
|
614 |
Returns the preferred width.
|
|
615 |
|
|
616 |
\sa setPreferredWidth(), setPreferredSize(), preferredSize()
|
|
617 |
*/
|
|
618 |
|
|
619 |
/*!
|
|
620 |
\fn qreal QGraphicsLayoutItem::preferredHeight() const
|
|
621 |
|
|
622 |
Returns the preferred height.
|
|
623 |
|
|
624 |
\sa setPreferredHeight(), setPreferredSize(), preferredSize()
|
|
625 |
*/
|
|
626 |
|
|
627 |
/*!
|
|
628 |
\fn qreal QGraphicsLayoutItem::maximumWidth() const
|
|
629 |
|
|
630 |
Returns the maximum width.
|
|
631 |
|
|
632 |
\sa setMaximumWidth(), setMaximumSize(), maximumSize()
|
|
633 |
*/
|
|
634 |
|
|
635 |
/*!
|
|
636 |
\fn qreal QGraphicsLayoutItem::maximumHeight() const
|
|
637 |
|
|
638 |
Returns the maximum height.
|
|
639 |
|
|
640 |
\sa setMaximumHeight(), setMaximumSize(), maximumSize()
|
|
641 |
*/
|
|
642 |
|
|
643 |
/*!
|
|
644 |
\fn virtual void QGraphicsLayoutItem::setGeometry(const QRectF &rect)
|
|
645 |
|
|
646 |
This virtual function sets the geometry of the QGraphicsLayoutItem to
|
|
647 |
\a rect, which is in parent coordinates (e.g., the top-left corner of \a rect
|
|
648 |
is equivalent to the item's position in parent coordinates).
|
|
649 |
|
|
650 |
You must reimplement this function in a subclass of QGraphicsLayoutItem to
|
|
651 |
receive geometry updates. The layout will call this function when it does a
|
|
652 |
rearrangement.
|
|
653 |
|
|
654 |
If \a rect is outside of the bounds of minimumSize and maximumSize, it
|
|
655 |
will be adjusted to its closest size so that it is within the legal
|
|
656 |
bounds.
|
|
657 |
|
|
658 |
\sa geometry()
|
|
659 |
*/
|
|
660 |
void QGraphicsLayoutItem::setGeometry(const QRectF &rect)
|
|
661 |
{
|
|
662 |
Q_D(QGraphicsLayoutItem);
|
|
663 |
QSizeF effectiveSize = rect.size().expandedTo(effectiveSizeHint(Qt::MinimumSize))
|
|
664 |
.boundedTo(effectiveSizeHint(Qt::MaximumSize));
|
|
665 |
d->geom = QRectF(rect.topLeft(), effectiveSize);
|
|
666 |
}
|
|
667 |
|
|
668 |
/*!
|
|
669 |
\fn QRectF QGraphicsLayoutItem::geometry() const
|
|
670 |
|
|
671 |
Returns the item's geometry (e.g., position and size) as a
|
|
672 |
QRectF. This function is equivalent to QRectF(pos(), size()).
|
|
673 |
|
|
674 |
\sa setGeometry()
|
|
675 |
*/
|
|
676 |
QRectF QGraphicsLayoutItem::geometry() const
|
|
677 |
{
|
|
678 |
Q_D(const QGraphicsLayoutItem);
|
|
679 |
return d->geom;
|
|
680 |
}
|
|
681 |
|
|
682 |
/*!
|
|
683 |
This virtual function provides the \a left, \a top, \a right and \a bottom
|
|
684 |
contents margins for this QGraphicsLayoutItem. The default implementation
|
|
685 |
assumes all contents margins are 0. The parameters point to values stored
|
|
686 |
in qreals. If any of the pointers is 0, that value will not be updated.
|
|
687 |
|
|
688 |
\sa QGraphicsWidget::setContentsMargins()
|
|
689 |
*/
|
|
690 |
void QGraphicsLayoutItem::getContentsMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const
|
|
691 |
{
|
|
692 |
if (left)
|
|
693 |
*left = 0;
|
|
694 |
if (top)
|
|
695 |
*top = 0;
|
|
696 |
if (right)
|
|
697 |
*right = 0;
|
|
698 |
if (bottom)
|
|
699 |
*bottom = 0;
|
|
700 |
}
|
|
701 |
|
|
702 |
/*!
|
|
703 |
Returns the contents rect in local coordinates.
|
|
704 |
|
|
705 |
The contents rect defines the subrectangle used by an associated layout
|
|
706 |
when arranging subitems. This function is a convenience function that
|
|
707 |
adjusts the item's geometry() by its contents margins. Note that
|
|
708 |
getContentsMargins() is a virtual function that you can reimplement to
|
|
709 |
return the item's contents margins.
|
|
710 |
|
|
711 |
\sa getContentsMargins(), geometry()
|
|
712 |
*/
|
|
713 |
QRectF QGraphicsLayoutItem::contentsRect() const
|
|
714 |
{
|
|
715 |
qreal left, top, right, bottom;
|
|
716 |
getContentsMargins(&left, &top, &right, &bottom);
|
|
717 |
return QRectF(QPointF(), geometry().size()).adjusted(+left, +top, -right, -bottom);
|
|
718 |
}
|
|
719 |
|
|
720 |
/*!
|
|
721 |
Returns the effective size hint for this QGraphicsLayoutItem.
|
|
722 |
|
|
723 |
\a which is the size hint in question.
|
|
724 |
\a constraint is an optional argument that defines a special constrain
|
|
725 |
when calculating the effective size hint. By default, \a constraint is
|
|
726 |
QSizeF(-1, -1), which means there is no constraint to the size hint.
|
|
727 |
|
|
728 |
If you want to specify the widget's size hint for a given width or height,
|
|
729 |
you can provide the fixed dimension in \a constraint. This is useful for
|
|
730 |
widgets that can grow only either vertically or horizontally, and need to
|
|
731 |
set either their width or their height to a special value.
|
|
732 |
|
|
733 |
For example, a text paragraph item fit into a column width of 200 may
|
|
734 |
grow vertically. You can pass QSizeF(200, -1) as a constraint to get a
|
|
735 |
suitable minimum, preferred and maximum height).
|
|
736 |
|
|
737 |
You can adjust the effective size hint by reimplementing sizeHint()
|
|
738 |
in a QGraphicsLayoutItem subclass, or by calling one of the following
|
|
739 |
functions: setMinimumSize(), setPreferredSize, or setMaximumSize()
|
|
740 |
(or a combination of both).
|
|
741 |
|
|
742 |
This function caches each of the size hints and guarantees that
|
|
743 |
sizeHint() will be called only once for each value of \a which - unless
|
|
744 |
\a constraint is not specified and updateGeometry() has been called.
|
|
745 |
|
|
746 |
\sa sizeHint()
|
|
747 |
*/
|
|
748 |
QSizeF QGraphicsLayoutItem::effectiveSizeHint(Qt::SizeHint which, const QSizeF &constraint) const
|
|
749 |
{
|
|
750 |
Q_D(const QGraphicsLayoutItem);
|
|
751 |
|
|
752 |
if (!d->userSizeHints && constraint.isValid())
|
|
753 |
return constraint;
|
|
754 |
|
|
755 |
// ### should respect size policy???
|
|
756 |
return d_ptr->effectiveSizeHints(constraint)[which];
|
|
757 |
}
|
|
758 |
|
|
759 |
/*!
|
|
760 |
This virtual function discards any cached size hint information. You
|
|
761 |
should always call this function if you change the return value of the
|
|
762 |
sizeHint() function. Subclasses must always call the base implementation
|
|
763 |
when reimplementing this function.
|
|
764 |
|
|
765 |
\sa effectiveSizeHint()
|
|
766 |
*/
|
|
767 |
void QGraphicsLayoutItem::updateGeometry()
|
|
768 |
{
|
|
769 |
Q_D(QGraphicsLayoutItem);
|
|
770 |
d->sizeHintCacheDirty = true;
|
|
771 |
}
|
|
772 |
|
|
773 |
/*!
|
|
774 |
Returns the parent of this QGraphicsLayoutItem, or 0 if there is no parent,
|
|
775 |
or if the parent does not inherit from QGraphicsLayoutItem
|
|
776 |
(QGraphicsLayoutItem is often used through multiple inheritance with
|
|
777 |
QObject-derived classes).
|
|
778 |
|
|
779 |
\sa setParentLayoutItem()
|
|
780 |
*/
|
|
781 |
QGraphicsLayoutItem *QGraphicsLayoutItem::parentLayoutItem() const
|
|
782 |
{
|
|
783 |
return d_func()->parent;
|
|
784 |
}
|
|
785 |
|
|
786 |
/*!
|
|
787 |
Sets the parent of this QGraphicsLayoutItem to \a parent.
|
|
788 |
|
|
789 |
\sa parentLayoutItem()
|
|
790 |
*/
|
|
791 |
void QGraphicsLayoutItem::setParentLayoutItem(QGraphicsLayoutItem *parent)
|
|
792 |
{
|
|
793 |
d_func()->parent = parent;
|
|
794 |
}
|
|
795 |
|
|
796 |
/*!
|
|
797 |
Returns true if this QGraphicsLayoutItem is a layout (e.g., is inherited
|
|
798 |
by an object that arranges other QGraphicsLayoutItem objects); otherwise
|
|
799 |
returns false.
|
|
800 |
|
|
801 |
\sa QGraphicsLayout
|
|
802 |
*/
|
|
803 |
bool QGraphicsLayoutItem::isLayout() const
|
|
804 |
{
|
|
805 |
return d_func()->isLayout;
|
|
806 |
}
|
|
807 |
|
|
808 |
/*!
|
|
809 |
\since 4.6
|
|
810 |
|
|
811 |
Returns whether a layout should delete this item in its destructor.
|
|
812 |
If its true, then the layout will delete it. If its false, then it is
|
|
813 |
assumed that another object has the ownership of it, and the layout won't
|
|
814 |
delete this item.
|
|
815 |
|
|
816 |
If the item inherits both QGraphicsItem and QGraphicsLayoutItem (such
|
|
817 |
as QGraphicsWidget does) the item is really part of two ownership
|
|
818 |
hierarchies. This property informs what the layout should do with its
|
|
819 |
child items when it is destructed. In the case of QGraphicsWidget, it
|
|
820 |
is preferred that when the layout is deleted it won't delete its children
|
|
821 |
(since they are also part of the graphics item hierarchy).
|
|
822 |
|
|
823 |
By default this value is initialized to false in QGraphicsLayoutItem,
|
|
824 |
but it is overridden by QGraphicsLayout to return true. This is because
|
|
825 |
QGraphicsLayout is not normally part of the QGraphicsItem hierarchy, so the
|
|
826 |
parent layout should delete it.
|
|
827 |
Subclasses might override this default behaviour by calling
|
|
828 |
setOwnedByLayout(true).
|
|
829 |
|
|
830 |
\sa setOwnedByLayout()
|
|
831 |
*/
|
|
832 |
bool QGraphicsLayoutItem::ownedByLayout() const
|
|
833 |
{
|
|
834 |
return d_func()->ownedByLayout;
|
|
835 |
}
|
|
836 |
/*!
|
|
837 |
\since 4.6
|
|
838 |
|
|
839 |
Sets whether a layout should delete this item in its destructor or not.
|
|
840 |
\a ownership must be true to in order for the layout to delete it.
|
|
841 |
\sa ownedByLayout()
|
|
842 |
*/
|
|
843 |
void QGraphicsLayoutItem::setOwnedByLayout(bool ownership)
|
|
844 |
{
|
|
845 |
d_func()->ownedByLayout = ownership;
|
|
846 |
}
|
|
847 |
|
|
848 |
/*!
|
|
849 |
* Returns the QGraphicsItem that this layout item represents.
|
|
850 |
* For QGraphicsWidget it will return itself. For custom items it can return an
|
|
851 |
* aggregated value.
|
|
852 |
*
|
|
853 |
* \sa setGraphicsItem()
|
|
854 |
*/
|
|
855 |
QGraphicsItem *QGraphicsLayoutItem::graphicsItem() const
|
|
856 |
{
|
|
857 |
return d_func()->graphicsItem;
|
|
858 |
}
|
|
859 |
|
|
860 |
/*!
|
|
861 |
* If the QGraphicsLayoutItem represents a QGraphicsItem, and it wants to take
|
|
862 |
* advantage of the automatic reparenting capabilities of QGraphicsLayout it
|
|
863 |
* should set this value.
|
|
864 |
* Note that if you delete \a item and not delete the layout item, you are
|
|
865 |
* responsible of calling setGraphicsItem(0) in order to avoid having a
|
|
866 |
* dangling pointer.
|
|
867 |
*
|
|
868 |
* \sa graphicsItem()
|
|
869 |
*/
|
|
870 |
void QGraphicsLayoutItem::setGraphicsItem(QGraphicsItem *item)
|
|
871 |
{
|
|
872 |
d_func()->graphicsItem = item;
|
|
873 |
}
|
|
874 |
|
|
875 |
QT_END_NAMESPACE
|
|
876 |
|
|
877 |
#endif //QT_NO_GRAPHICSVIEW
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