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/****************************************************************************
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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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** This file is part of the QtGui module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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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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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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****************************************************************************/
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#ifndef QT_NO_GRAPHICSVIEW
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#include "qgraphicslayout_p.h"
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#include "qgraphicslayout.h"
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#include "qgraphicswidget.h"
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#include "qapplication.h"
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\a mw is the new parent. all items in the layout will be a child of \a mw.
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void QGraphicsLayoutPrivate::reparentChildItems(QGraphicsItem *newParent)
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//bool mwVisible = mw && mw->isVisible();
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for (int i = 0; i < n; ++i) {
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QGraphicsLayoutItem *layoutChild = q->itemAt(i);
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if (layoutChild->isLayout()) {
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QGraphicsLayout *l = static_cast<QGraphicsLayout*>(layoutChild);
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l->d_func()->reparentChildItems(newParent);
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} else if (QGraphicsItem *itemChild = layoutChild->graphicsItem()){
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QGraphicsItem *childParent = itemChild->parentItem();
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if (childParent && childParent != newParent && itemChild->isWidget() && qt_graphicsLayoutDebug()) {
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QGraphicsWidget *w = static_cast<QGraphicsWidget*>(layoutChild);
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qWarning("QGraphicsLayout::addChildLayout: widget %s \"%s\" in wrong parent; moved to correct parent",
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w->metaObject()->className(), w->objectName().toLocal8Bit().constData());
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if (childParent != newParent)
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itemChild->setParentItem(newParent);
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void QGraphicsLayoutPrivate::getMargin(qreal *result, qreal userMargin, QStyle::PixelMetric pm) const
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Q_Q(const QGraphicsLayout);
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QGraphicsLayoutItem *parent = q->parentLayoutItem();
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if (userMargin >= 0.0) {
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} else if (parent->isLayout()) { // sublayouts have 0 margin by default
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if (QGraphicsItem *layoutParentItem = parentItem()) {
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if (layoutParentItem->isWidget())
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*result = (qreal)static_cast<QGraphicsWidget*>(layoutParentItem)->style()->pixelMetric(pm, 0);
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Qt::LayoutDirection QGraphicsLayoutPrivate::visualDirection() const
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if (QGraphicsItem *maybeWidget = parentItem()) {
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if (maybeWidget->isWidget())
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return static_cast<QGraphicsWidget*>(maybeWidget)->layoutDirection();
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return QApplication::layoutDirection();
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static bool removeLayoutItemFromLayout(QGraphicsLayout *lay, QGraphicsLayoutItem *layoutItem)
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for (int i = lay->count() - 1; i >= 0; --i) {
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QGraphicsLayoutItem *child = lay->itemAt(i);
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if (child && child->isLayout()) {
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if (removeLayoutItemFromLayout(static_cast<QGraphicsLayout*>(child), layoutItem))
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} else if (child == layoutItem) {
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This function is called from subclasses to add a layout item \a layoutItem
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It takes care of automatically reparenting graphics items, if needed.
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If \a layoutItem is a is already in a layout, it will remove it from that layout.
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void QGraphicsLayoutPrivate::addChildLayoutItem(QGraphicsLayoutItem *layoutItem)
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Q_Q(QGraphicsLayout);
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if (QGraphicsLayoutItem *maybeLayout = layoutItem->parentLayoutItem()) {
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if (maybeLayout->isLayout())
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removeLayoutItemFromLayout(static_cast<QGraphicsLayout*>(maybeLayout), layoutItem);
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layoutItem->setParentLayoutItem(q);
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if (layoutItem->isLayout()) {
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if (QGraphicsItem *parItem = parentItem()) {
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static_cast<QGraphicsLayout*>(layoutItem)->d_func()->reparentChildItems(parItem);
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if (QGraphicsItem *item = layoutItem->graphicsItem()) {
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QGraphicsItem *newParent = parentItem();
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QGraphicsItem *oldParent = item->parentItem();
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if (oldParent == newParent || !newParent)
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if (oldParent && item->isWidget()) {
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QGraphicsWidget *w = static_cast<QGraphicsWidget*>(item);
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qWarning("QGraphicsLayout::addChildLayoutItem: %s \"%s\" in wrong parent; moved to correct parent",
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w->metaObject()->className(), w->objectName().toLocal8Bit().constData());
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item->setParentItem(newParent);
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void QGraphicsLayoutPrivate::activateRecursive(QGraphicsLayoutItem *item)
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if (item->isLayout()) {
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QGraphicsLayout *layout = static_cast<QGraphicsLayout *>(item);
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if (layout->d_func()->activated) {
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if (QGraphicsLayout::instantInvalidatePropagation()) {
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layout->invalidate(); // ### LOOKS SUSPICIOUSLY WRONG!!???
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for (int i = layout->count() - 1; i >= 0; --i) {
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QGraphicsLayoutItem *childItem = layout->itemAt(i);
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activateRecursive(childItem);
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layout->d_func()->activated = true;
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#endif //QT_NO_GRAPHICSVIEW