scenepositionattached.h

/*
 *  SPDX-FileCopyrightText: 2018 Marco Martin <mart@kde.org>
 *
 *  SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
#ifndef SCENEPOSITIONATTACHED_H
#define SCENEPOSITIONATTACHED_H
 
#include <QObject>
#include <QQmlEngine>
 
class QQuickItem;
 
/**
 * This attached property contains the information about the scene position of the item:
 * Its global x and y coordinates will update automatically and can be binded
 * @code
 * import org.kde.kirigami as Kirigami
 * Text {
 *    text: ScenePosition.x
 * }
 * @endcode
 * @since 2.3
 */
class ScenePositionAttached : public QObject
{
    Q_OBJECT
    QML_ELEMENT
    QML_ATTACHED(ScenePositionAttached)
    QML_NAMED_ELEMENT(ScenePosition)
    QML_UNCREATABLE("")
    /**
     * The global scene X position
     */
    Q_PROPERTY(qreal x READ x NOTIFY xChanged FINAL)
 
    /**
     * The global scene Y position
     */
    Q_PROPERTY(qreal y READ y NOTIFY yChanged FINAL)
 
public:
    explicit ScenePositionAttached(QObject *parent = nullptr);
    ~ScenePositionAttached() override;
 
    qreal x() const;
    qreal y() const;
 
    // QML attached property
    static ScenePositionAttached *qmlAttachedProperties(QObject *object);
 
Q_SIGNALS:
    void xChanged();
    void yChanged();
 
private:
    void connectAncestors(QQuickItem *item);
 
    QQuickItem *m_item = nullptr;
    QList<QQuickItem *> m_ancestors;
};
 
QML_DECLARE_TYPEINFO(ScenePositionAttached, QML_HAS_ATTACHED_PROPERTIES)
 
#endif // SCENEPOSITIONATTACHED_H