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

[Curtis Mitch]

From: Interest [mailto:interest-bounces+mitch.curtis=theqtcompany.com at qt-project.org] On Behalf Of Sina Dogru
Sent: Monday, 22 February 2016 1:15 PM
To: interest at qt-project.org
Subject: [Interest] MouseArea blocks 'Custom Scene Graph Item's mouse events


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_OBJECT

public:

    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.



There is an answer for that question. What happens if you try it? You can also try setting propagateComposedEvents to true:

http://doc.qt.io/qt-5/qml-qtquick-mousearea.html#propagateComposedEvents-prop

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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