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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Quick Controls module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#include "qquicksceneposlistener_p.h"
#include <QtQuick/private/qquickitem_p.h>
QT_BEGIN_NAMESPACE
static const QQuickItemPrivate::ChangeTypes AncestorChangeTypes = QQuickItemPrivate::Geometry
| QQuickItemPrivate::Parent
| QQuickItemPrivate::Children;
static const QQuickItemPrivate::ChangeTypes ItemChangeTypes = QQuickItemPrivate::Geometry
| QQuickItemPrivate::Parent
| QQuickItemPrivate::Destroyed;
QQuickScenePosListener1::QQuickScenePosListener1(QObject *parent)
: QObject(parent)
, m_enabled(false)
, m_item(0)
{
}
QQuickScenePosListener1::~QQuickScenePosListener1()
{
if (m_item == 0)
return;
QQuickItemPrivate::get(m_item)->removeItemChangeListener(this, ItemChangeTypes);
removeAncestorListeners(m_item->parentItem());
}
QQuickItem *QQuickScenePosListener1::item() const
{
return m_item;
}
void QQuickScenePosListener1::setItem(QQuickItem *item)
{
if (m_item == item)
return;
if (m_item != 0) {
QQuickItemPrivate::get(m_item)->removeItemChangeListener(this, ItemChangeTypes);
removeAncestorListeners(m_item->parentItem());
}
m_item = item;
if (m_item == 0)
return;
if (m_enabled) {
QQuickItemPrivate::get(m_item)->addItemChangeListener(this, ItemChangeTypes);
addAncestorListeners(m_item->parentItem());
}
updateScenePos();
}
QPointF QQuickScenePosListener1::scenePos() const
{
return m_scenePos;
}
bool QQuickScenePosListener1::isEnabled() const
{
return m_enabled;
}
void QQuickScenePosListener1::setEnabled(bool enabled)
{
if (m_enabled == enabled)
return;
m_enabled = enabled;
if (m_item != 0) {
if (enabled) {
QQuickItemPrivate::get(m_item)->addItemChangeListener(this, ItemChangeTypes);
addAncestorListeners(m_item->parentItem());
} else {
QQuickItemPrivate::get(m_item)->removeItemChangeListener(this, ItemChangeTypes);
removeAncestorListeners(m_item->parentItem());
}
}
emit enabledChanged();
}
void QQuickScenePosListener1::itemGeometryChanged(QQuickItem *, QQuickGeometryChange, const QRectF &)
{
updateScenePos();
}
void QQuickScenePosListener1::itemParentChanged(QQuickItem *, QQuickItem *parent)
{
addAncestorListeners(parent);
}
void QQuickScenePosListener1::itemChildRemoved(QQuickItem *, QQuickItem *child)
{
if (isAncestor(child))
removeAncestorListeners(child);
}
void QQuickScenePosListener1::itemDestroyed(QQuickItem *item)
{
Q_ASSERT(m_item == item);
// Remove all injected listeners.
m_item = 0;
QQuickItemPrivate::get(item)->removeItemChangeListener(this, ItemChangeTypes);
removeAncestorListeners(item->parentItem());
}
void QQuickScenePosListener1::updateScenePos()
{
const QPointF &scenePos = m_item->mapToScene(QPointF(0, 0));
if (m_scenePos != scenePos) {
m_scenePos = scenePos;
emit scenePosChanged();
}
}
/*!
\internal
Remove this listener from \a item and all its ancestors.
*/
void QQuickScenePosListener1::removeAncestorListeners(QQuickItem *item)
{
if (item == m_item)
return;
QQuickItem *p = item;
while (p != 0) {
QQuickItemPrivate::get(p)->removeItemChangeListener(this, AncestorChangeTypes);
p = p->parentItem();
}
}
/*!
\internal
Injects this as a listener to \a item and all its ancestors.
*/
void QQuickScenePosListener1::addAncestorListeners(QQuickItem *item)
{
if (item == m_item)
return;
QQuickItem *p = item;
while (p != 0) {
QQuickItemPrivate::get(p)->addItemChangeListener(this, AncestorChangeTypes);
p = p->parentItem();
}
}
bool QQuickScenePosListener1::isAncestor(QQuickItem *item) const
{
if (!m_item)
return false;
QQuickItem *parent = m_item->parentItem();
while (parent) {
if (parent == item)
return true;
parent = parent->parentItem();
}
return false;
}
QT_END_NAMESPACE
|
