Bug ? MouseEvent generates Canceled signal if not accepted

profi-S

Hi,
I tried to make two overlapped MouseAreas processing the same signals, but seems MouseArea does not propagate signals by default. The "documentation ":http://doc.qt.io/qt-5/qml-qtquick-mouseevent.html#accepted-prop states that mouse event has to be accepted to prevent propagation, but it is accepted also if I have just empty handler processing such signals (Pressed).
If in onPressed() handler I set accepted to false this cause Canceled signal to be generated ! If we would follow documentation this must just propagate mouse event to another MouseArea

Simple code for testing :
@import QtQuick 2.0

Item{
width: 300
height: 300
Rectangle {
width: 300
height: 300
color: "red"
MouseArea{
anchors.fill: parent
onPressed: {

            console.log("red pressed");
        }
        onReleased: {
            console.log("red released");
        }
        onCanceled: {
            console.log("red canceled");
        }
        onPositionChanged: {
            console.log("red position changed");
        }
    }

    Rectangle{
        anchors.centerIn: parent
        width: 100
        height: 100
        color: "green"
        MouseArea{
            anchors.fill: parent
            propagateComposedEvents: true
            onPressed: {
                mouse.accepted = false;
                console.log("green pressed");
            }
            onReleased: {
                console.log("green released");
            }
            onCanceled: {
                console.log("green canceled");
            }
            onPositionChanged: {
                console.log("green position changed");
            }
        }
    }
}

}

@

I click on the green rectangle, this code would produce log:

green pressed
green cancled
red pressed
red released

At the moment I do not have idea if this is a bug or not, and how to make overlapped mouseareas to process same event.

p3c0

Hi,

bq. If in onPressed() handler I set accepted to false this cause Canceled signal to be generated ! If we would follow documentation this must just propagate mouse event to another MouseArea

It will not as "propagateComposedEvents":http://doc.qt.io/qt-5/qml-qtquick-mousearea.html#propagateComposedEvents-prop only works for composed events and pressed is not a composed event.

From the Doc:

bq. MouseArea contains several composed events: clicked, doubleClicked and pressAndHold. These are composed of basic mouse events, like pressed, and can be propagated differently in comparison to basic events.