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// Copyright (C) 2017 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 "qquickattachedobject_p.h"
#include <QtCore/qpointer.h>
#include <QtQuick/qquickwindow.h>
#include <QtQuick/private/qquickitem_p.h>
#include <QtQuick/private/qquickitemchangelistener_p.h>
#include <QtQuickTemplates2/private/qquickpopup_p.h>
QT_BEGIN_NAMESPACE
static QQuickAttachedObject *attachedObject(const QMetaObject *type, QObject *object, bool create = false)
{
if (!object)
return nullptr;
auto func = qmlAttachedPropertiesFunction(object, type);
return qobject_cast<QQuickAttachedObject *>(qmlAttachedPropertiesObject(object, func, create));
}
static QQuickAttachedObject *findAttachedParent(const QMetaObject *type, QObject *object)
{
QQuickItem *item = qobject_cast<QQuickItem *>(object);
if (item) {
// lookup parent items and popups
QQuickItem *parent = item->parentItem();
while (parent) {
QQuickAttachedObject *attached = attachedObject(type, parent);
if (attached)
return attached;
QQuickPopup *popup = qobject_cast<QQuickPopup *>(parent->parent());
if (popup)
return attachedObject(type, popup);
parent = parent->parentItem();
}
// fallback to item's window
QQuickAttachedObject *attached = attachedObject(type, item->window());
if (attached)
return attached;
} else {
// lookup popup's window
QQuickPopup *popup = qobject_cast<QQuickPopup *>(object);
if (popup)
return attachedObject(type, popup->popupItem()->window());
}
// lookup parent window
QQuickWindow *window = qobject_cast<QQuickWindow *>(object);
if (window) {
QQuickWindow *parentWindow = qobject_cast<QQuickWindow *>(window->parent());
if (parentWindow) {
QQuickAttachedObject *attached = attachedObject(type, window);
if (attached)
return attached;
}
}
// fallback to engine (global)
if (object) {
QQmlEngine *engine = qmlEngine(object);
if (engine) {
QByteArray name = QByteArray("_q_") + type->className();
QQuickAttachedObject *attached = engine->property(name).value<QQuickAttachedObject *>();
if (!attached) {
attached = attachedObject(type, engine, true);
engine->setProperty(name, QVariant::fromValue(attached));
}
return attached;
}
}
return nullptr;
}
static QList<QQuickAttachedObject *> findAttachedChildren(const QMetaObject *type, QObject *object)
{
QList<QQuickAttachedObject *> children;
QQuickItem *item = qobject_cast<QQuickItem *>(object);
if (!item) {
QQuickWindow *window = qobject_cast<QQuickWindow *>(object);
if (window) {
item = window->contentItem();
const auto &windowChildren = window->children();
for (QObject *child : windowChildren) {
QQuickWindow *childWindow = qobject_cast<QQuickWindow *>(child);
if (childWindow) {
QQuickAttachedObject *attached = attachedObject(type, childWindow);
if (attached)
children += attached;
}
}
}
}
if (item) {
const auto childItems = item->childItems();
for (QQuickItem *child : childItems) {
QQuickAttachedObject *attached = attachedObject(type, child);
if (attached)
children += attached;
else
children += findAttachedChildren(type, child);
}
}
return children;
}
static QQuickItem *findAttachedItem(QObject *parent)
{
QQuickItem *item = qobject_cast<QQuickItem *>(parent);
if (!item) {
QQuickPopup *popup = qobject_cast<QQuickPopup *>(parent);
if (popup)
item = popup->popupItem();
}
return item;
}
class QQuickAttachedObjectPrivate : public QObjectPrivate, public QQuickItemChangeListener
{
public:
Q_DECLARE_PUBLIC(QQuickAttachedObject)
static QQuickAttachedObjectPrivate *get(QQuickAttachedObject *attachedObject)
{
return attachedObject->d_func();
}
void attachTo(QObject *object);
void detachFrom(QObject *object);
void itemWindowChanged(QQuickWindow *window);
void itemParentChanged(QQuickItem *item, QQuickItem *parent) override;
QList<QQuickAttachedObject *> attachedChildren;
QPointer<QQuickAttachedObject> attachedParent;
};
void QQuickAttachedObjectPrivate::attachTo(QObject *object)
{
QQuickItem *item = findAttachedItem(object);
if (item) {
connect(item, &QQuickItem::windowChanged, this, &QQuickAttachedObjectPrivate::itemWindowChanged);
QQuickItemPrivate::get(item)->addItemChangeListener(this, QQuickItemPrivate::Parent);
}
}
void QQuickAttachedObjectPrivate::detachFrom(QObject *object)
{
QQuickItem *item = findAttachedItem(object);
if (item) {
disconnect(item, &QQuickItem::windowChanged, this, &QQuickAttachedObjectPrivate::itemWindowChanged);
QQuickItemPrivate::get(item)->removeItemChangeListener(this, QQuickItemPrivate::Parent);
}
}
void QQuickAttachedObjectPrivate::itemWindowChanged(QQuickWindow *window)
{
Q_Q(QQuickAttachedObject);
QQuickAttachedObject *attachedParent = nullptr;
QQuickItem *item = qobject_cast<QQuickItem *>(q->sender());
if (item)
attachedParent = findAttachedParent(q->metaObject(), item);
if (!attachedParent)
attachedParent = attachedObject(q->metaObject(), window);
q->setAttachedParent(attachedParent);
}
void QQuickAttachedObjectPrivate::itemParentChanged(QQuickItem *item, QQuickItem *parent)
{
Q_Q(QQuickAttachedObject);
Q_UNUSED(parent);
q->setAttachedParent(findAttachedParent(q->metaObject(), item));
}
QQuickAttachedObject::QQuickAttachedObject(QObject *parent)
: QObject(*(new QQuickAttachedObjectPrivate), parent)
{
Q_D(QQuickAttachedObject);
d->attachTo(parent);
}
QQuickAttachedObject::~QQuickAttachedObject()
{
Q_D(QQuickAttachedObject);
d->detachFrom(parent());
setAttachedParent(nullptr);
}
QList<QQuickAttachedObject *> QQuickAttachedObject::attachedChildren() const
{
Q_D(const QQuickAttachedObject);
return d->attachedChildren;
}
QQuickAttachedObject *QQuickAttachedObject::attachedParent() const
{
Q_D(const QQuickAttachedObject);
return d->attachedParent;
}
void QQuickAttachedObject::setAttachedParent(QQuickAttachedObject *parent)
{
Q_D(QQuickAttachedObject);
if (d->attachedParent == parent)
return;
QQuickAttachedObject *oldParent = d->attachedParent;
if (d->attachedParent)
QQuickAttachedObjectPrivate::get(d->attachedParent)->attachedChildren.removeOne(this);
d->attachedParent = parent;
if (parent)
QQuickAttachedObjectPrivate::get(parent)->attachedChildren.append(this);
attachedParentChange(parent, oldParent);
}
void QQuickAttachedObject::init()
{
QQuickAttachedObject *attachedParent = findAttachedParent(metaObject(), parent());
if (attachedParent)
setAttachedParent(attachedParent);
const QList<QQuickAttachedObject *> attachedChildren = findAttachedChildren(metaObject(), parent());
for (QQuickAttachedObject *child : attachedChildren)
child->setAttachedParent(this);
}
void QQuickAttachedObject::attachedParentChange(QQuickAttachedObject *newParent, QQuickAttachedObject *oldParent)
{
Q_UNUSED(newParent);
Q_UNUSED(oldParent);
}
QT_END_NAMESPACE
#include "moc_qquickattachedobject_p.cpp"
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