| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the Qt Quick Controls module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
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| ** |
| ** GNU Lesser General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU Lesser |
| ** General Public License version 3 as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.LGPL3 included in the |
| ** packaging of this file. Please review the following information to |
| ** ensure the GNU Lesser General Public License version 3 requirements |
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| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
| ** Qt Foundation. The licenses are as published by the Free Software |
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| ** information to ensure the GNU General Public License requirements will |
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| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #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 |