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Diffstat (limited to 'src/quickcontrols2/qquickattachedobject.cpp')
| -rw-r--r-- | src/quickcontrols2/qquickattachedobject.cpp | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/src/quickcontrols2/qquickattachedobject.cpp b/src/quickcontrols2/qquickattachedobject.cpp new file mode 100644 index 00000000..bada982e --- /dev/null +++ b/src/quickcontrols2/qquickattachedobject.cpp @@ -0,0 +1,249 @@ +/**************************************************************************** +** +** Copyright (C) 2017 The Qt Company Ltd. +** Contact: http://www.qt.io/licensing/ +** +** This file is part of the Qt Quick Controls 2 module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL3$ +** 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 http://www.qt.io/terms-conditions. For further +** information use the contact form at http://www.qt.io/contact-us. +** +** 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.LGPLv3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or later as published by the Free +** Software Foundation and appearing in the file LICENSE.GPL included in +** the packaging of this file. Please review the following information to +** ensure the GNU General Public License version 2.0 requirements will be +** met: http://www.gnu.org/licenses/gpl-2.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qquickattachedobject_p.h" + +#include <QtQuick/qquickwindow.h> +#include <QtQuick/private/qquickitem_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; + int idx = -1; + return qobject_cast<QQuickAttachedObject *>(qmlAttachedPropertiesObject(&idx, object, type, 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; +} + +QQuickAttachedObject::QQuickAttachedObject(QObject *parent) : QObject(parent) +{ + attachTo(parent); +} + +QQuickAttachedObject::QQuickAttachedObject(QObjectPrivate &dd, QObject *parent) + : QObject(dd, parent) +{ + attachTo(parent); +} + +QQuickAttachedObject::~QQuickAttachedObject() +{ + detachFrom(parent()); + setAttachedParent(nullptr); +} + +QList<QQuickAttachedObject *> QQuickAttachedObject::attachedChildren() const +{ + return m_attachedChildren; +} + +QQuickAttachedObject *QQuickAttachedObject::attachedParent() const +{ + return m_attachedParent; +} + +void QQuickAttachedObject::setAttachedParent(QQuickAttachedObject *parent) +{ + if (m_attachedParent != parent) { + QQuickAttachedObject *oldParent = m_attachedParent; + if (m_attachedParent) + m_attachedParent->m_attachedChildren.removeOne(this); + m_attachedParent = parent; + if (parent) + parent->m_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); +} + +void QQuickAttachedObject::itemWindowChanged(QQuickWindow *window) +{ + QQuickAttachedObject *attachedParent = nullptr; + QQuickItem *item = qobject_cast<QQuickItem *>(sender()); + if (item) + attachedParent = findAttachedParent(metaObject(), item); + if (!attachedParent) + attachedParent = attachedObject(metaObject(), window); + setAttachedParent(attachedParent); +} + +void QQuickAttachedObject::itemParentChanged(QQuickItem *item, QQuickItem *parent) +{ + Q_UNUSED(parent); + setAttachedParent(findAttachedParent(metaObject(), item)); +} + +void QQuickAttachedObject::attachTo(QObject *object) +{ + QQuickItem *item = findAttachedItem(object); + if (item) { + connect(item, &QQuickItem::windowChanged, this, &QQuickAttachedObject::itemWindowChanged); + QQuickItemPrivate::get(item)->addItemChangeListener(this, QQuickItemPrivate::Parent); + } +} + +void QQuickAttachedObject::detachFrom(QObject *object) +{ + QQuickItem *item = findAttachedItem(object); + if (item) { + disconnect(item, &QQuickItem::windowChanged, this, &QQuickAttachedObject::itemWindowChanged); + QQuickItemPrivate::get(item)->removeItemChangeListener(this, QQuickItemPrivate::Parent); + } +} + +QT_END_NAMESPACE |