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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qglobal.h"
#include "qgraphicslayout_p.h"
#include "qgraphicslayout.h"
#include "qgraphicswidget.h"
#include "qapplication.h"
QT_BEGIN_NAMESPACE
/*!
\internal
\a mw is the new parent. all items in the layout will be a child of \a mw.
*/
void QGraphicsLayoutPrivate::reparentChildItems(QGraphicsItem *newParent)
{
Q_Q(QGraphicsLayout);
int n = q->count();
//bool mwVisible = mw && mw->isVisible();
for (int i = 0; i < n; ++i) {
QGraphicsLayoutItem *layoutChild = q->itemAt(i);
if (!layoutChild) {
// Skip stretch items
continue;
}
if (layoutChild->isLayout()) {
QGraphicsLayout *l = static_cast<QGraphicsLayout*>(layoutChild);
l->d_func()->reparentChildItems(newParent);
} else if (QGraphicsItem *itemChild = layoutChild->graphicsItem()){
QGraphicsItem *childParent = itemChild->parentItem();
#ifdef QT_DEBUG
if (childParent && childParent != newParent && itemChild->isWidget() && qt_graphicsLayoutDebug()) {
QGraphicsWidget *w = static_cast<QGraphicsWidget*>(layoutChild);
qWarning("QGraphicsLayout::addChildLayout: widget %s \"%s\" in wrong parent; moved to correct parent",
w->metaObject()->className(), w->objectName().toLocal8Bit().constData());
}
#endif
if (childParent != newParent)
itemChild->setParentItem(newParent);
}
}
}
void QGraphicsLayoutPrivate::getMargin(qreal *result, qreal userMargin, QStyle::PixelMetric pm) const
{
if (!result)
return;
Q_Q(const QGraphicsLayout);
QGraphicsLayoutItem *parent = q->parentLayoutItem();
if (userMargin >= 0.0) {
*result = userMargin;
} else if (!parent) {
*result = 0.0;
} else if (parent->isLayout()) { // sublayouts have 0 margin by default
*result = 0.0;
} else {
*result = 0.0;
if (QGraphicsItem *layoutParentItem = parentItem()) {
if (layoutParentItem->isWidget())
*result = (qreal)static_cast<QGraphicsWidget*>(layoutParentItem)->style()->pixelMetric(pm, nullptr);
}
}
}
Qt::LayoutDirection QGraphicsLayoutPrivate::visualDirection() const
{
if (QGraphicsItem *maybeWidget = parentItem()) {
if (maybeWidget->isWidget())
return static_cast<QGraphicsWidget*>(maybeWidget)->layoutDirection();
}
return QGuiApplication::layoutDirection();
}
static bool removeLayoutItemFromLayout(QGraphicsLayout *lay, QGraphicsLayoutItem *layoutItem)
{
if (!lay)
return false;
for (int i = lay->count() - 1; i >= 0; --i) {
QGraphicsLayoutItem *child = lay->itemAt(i);
if (child && child->isLayout()) {
if (removeLayoutItemFromLayout(static_cast<QGraphicsLayout*>(child), layoutItem))
return true;
} else if (child == layoutItem) {
lay->removeAt(i);
return true;
}
}
return false;
}
/*!
\internal
This function is called from subclasses to add a layout item \a layoutItem
to a layout.
It takes care of automatically reparenting graphics items, if needed.
If \a layoutItem is a is already in a layout, it will remove it from that layout.
*/
void QGraphicsLayoutPrivate::addChildLayoutItem(QGraphicsLayoutItem *layoutItem)
{
Q_Q(QGraphicsLayout);
if (QGraphicsLayoutItem *maybeLayout = layoutItem->parentLayoutItem()) {
if (maybeLayout->isLayout())
removeLayoutItemFromLayout(static_cast<QGraphicsLayout*>(maybeLayout), layoutItem);
}
layoutItem->setParentLayoutItem(q);
if (layoutItem->isLayout()) {
if (QGraphicsItem *parItem = parentItem()) {
static_cast<QGraphicsLayout*>(layoutItem)->d_func()->reparentChildItems(parItem);
}
} else {
if (QGraphicsItem *item = layoutItem->graphicsItem()) {
QGraphicsItem *newParent = parentItem();
QGraphicsItem *oldParent = item->parentItem();
if (oldParent == newParent || !newParent)
return;
#ifdef QT_DEBUG
if (oldParent && item->isWidget()) {
QGraphicsWidget *w = static_cast<QGraphicsWidget*>(item);
qWarning("QGraphicsLayout::addChildLayoutItem: %s \"%s\" in wrong parent; moved to correct parent",
w->metaObject()->className(), w->objectName().toLocal8Bit().constData());
}
#endif
item->setParentItem(newParent);
}
}
}
void QGraphicsLayoutPrivate::activateRecursive(QGraphicsLayoutItem *item)
{
if (item->isLayout()) {
QGraphicsLayout *layout = static_cast<QGraphicsLayout *>(item);
if (layout->d_func()->activated) {
if (QGraphicsLayout::instantInvalidatePropagation()) {
return;
} else {
layout->invalidate(); // ### LOOKS SUSPICIOUSLY WRONG!!???
}
}
for (int i = layout->count() - 1; i >= 0; --i) {
QGraphicsLayoutItem *childItem = layout->itemAt(i);
if (childItem)
activateRecursive(childItem);
}
layout->d_func()->activated = true;
}
}
QT_END_NAMESPACE
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