nested_scroll.hpp

#pragma once
 
#include <QPointer>
#include <QQuickItem>
#include <qqmlregistration.h>
#include "qml_material/export.hpp"
#include "qml_material/input/nested_scroll_connection.hpp"
 
namespace qml_material
{
class NestedScrollHandler;
 
class QML_MATERIAL_API NestedScroll : public QObject {
    Q_OBJECT
    QML_ELEMENT
    QML_UNCREATABLE("NestedScroll is an attached property")
    QML_ATTACHED(NestedScroll)
    Q_PROPERTY(bool enabled READ enabled WRITE setEnabled NOTIFY enabledChanged FINAL)
    Q_PROPERTY(Qt::Orientations axes READ axes WRITE setAxes NOTIFY axesChanged FINAL)
    Q_PROPERTY(bool wheelEnabled MEMBER m_wheelEnabled NOTIFY wheelEnabledChanged FINAL)
    Q_PROPERTY(bool restoreOnReverse MEMBER m_restoreOnReverse NOTIFY restoreOnReverseChanged FINAL)
    Q_PROPERTY(NestedScrollConnection* connection READ connection WRITE setConnection NOTIFY
                   connectionChanged FINAL)
public:
    explicit NestedScroll(QObject* parent);
    ~NestedScroll() override;
    static NestedScroll*    qmlAttachedProperties(QObject*);
    static bool             coordinates(QQuickItem* receiver, QQuickItem* ancestor);
    bool                    enabled() const { return m_enabled; }
    void                    setEnabled(bool);
    Qt::Orientations        axes() const { return m_axes; }
    void                    setAxes(Qt::Orientations);
    QQuickItem*             item() const { return m_item; }
    NestedScrollConnection* connection() const { return m_connection; }
    void                    setConnection(NestedScrollConnection*);
    Q_SIGNAL void           connectionChanged();
    Q_SIGNAL void           enabledChanged();
    Q_SIGNAL void           axesChanged();
    Q_SIGNAL void           wheelEnabledChanged();
    Q_SIGNAL void           restoreOnReverseChanged();
    // Actual content displacement in this participant's local coordinates, excluding overscroll.
    Q_SIGNAL void scrollConsumed(QPointF delta);
    Q_SIGNAL void scrollStarted();
    Q_SIGNAL void scrollFinished(bool cancelled);
 
private:
    friend class NestedScrollHandler;
    QPointer<QQuickItem>             m_item;
    QPointer<NestedScrollHandler>    m_handler;
    QPointer<NestedScrollHandler>    m_controller;
    QPointer<NestedScrollConnection> m_connection;
    QMetaObject::Connection          m_connectionDestroyed;
    bool                             m_enabled          = false;
    bool                             m_wheelEnabled     = true;
    bool                             m_restoreOnReverse = false;
    Qt::Orientations                 m_axes             = Qt::Horizontal | Qt::Vertical;
};
} // namespace qml_material
 
QML_DECLARE_TYPEINFO(qml_material::NestedScroll, QML_HAS_ATTACHED_PROPERTIES)