[Interest] MouseArea blocks 'Custom Scene Graph Item's mouse events

[Sina Dogru]

Hello,

I am implementing a custom scene graph item, which inherits QQuickItem
<http://doc.qt.io/qt-5/qquickitem.html>.

class CustomItem : public QQuickItem {
    Q_OBJECTpublic:
    CustomItem()
    {
        setAcceptHoverEvents(true);
        setAcceptedMouseButtons(Qt::LeftButton);
        setFlag(ItemHasContents);
    }protected:
    QSGNode *updatePaintNode(QSGNode *, UpdatePaintNodeData *) override;

    void hoverEnterEvent(QHoverEvent *e) override;
    void hoverLeaveEvent(QHoverEvent *e) override;
    void hoverMoveEvent(QHoverEvent *e) override;

    void mouseMoveEvent(QMouseEvent *e) override;
    void mouseReleaseEvent(QMouseEvent *e) override;
    void mousePressEvent(QMouseEvent *e) override;
};


And I use that CustomItem as a visual parent to some QML Types, like
Rectangle <http://doc.qt.io/qt-5/qml-qtquick-rectangle.html>.

CustomItem {
    id: custom
    width: 400; height: 400
    Rectangle {
        id: rect
        z: -1
        anchors.fill: parent
        color: "blue"
    }
}

Everything was perfect, I was able to draw over the visual childrens using
'z' property with overriding QQuickItem::updatePaintNode.

But the problem raised when I use MouseArea
<http://doc.qt.io/qt-5/qml-qtquick-mousearea.html> as a children of my
'CustomItem'.

CustomItem {
    id: custom
    width: 400; height: 400
    Rectangle {
        id: rect
        z: -1
        anchors.fill: parent
        color: "blue"
    }
    MouseArea {
        anchors.fill: parent
        propagateComposedEvents: true
        drag.target: parent
        drag.axis: Drag.XandYAxis
    }
}

After that, my 'CustomItem' was not getting the mouse events like
QQuickItem::hoverEnterEvent
<http://doc.qt.io/qt-5/qquickitem.html#hoverEnterEvent> ,
QQuickItem::mousePressEvent
<https://forum.qt.io/topic/64437/doc.qt.io/qt-5/qquickitem.html#mousePressEvent>
or QQuickItem::mouseMoveEvent
<http://doc.qt.io/qt-5/qquickitem.html#mouseMoveEvent> which those are
crucial to implement in my case.

I am not sure if this even possible or am I doing something wrong? If there
is a candidate solution for that particular problem, I would be happy to
try it.

Note: Here is a similar question on StackOverFlow
<http://stackoverflow.com/questions/23986201/mouse-events-not-handled-within-qquickitem-inheritor>
which have not been replied.


I have already asked it question on QtForums
<https://forum.qt.io/topic/64437/mousearea-blocks-custom-scene-graph-item-s-mouse-events>
.
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