Why can't QML key events be intercepted? - qt

Question

I have the following code:
MyTest.qml
import QtQuick 2.0
FocusScope {
anchors.fill: parent
Keys.onReturnPressed: {
console.log("++++++++++")
}
}
main.qml
import QtQuick 2.9
import QtQuick.Window 2.2
Window {
visible: true
width: 640
height: 480
title: qsTr("Hello World")
MyTest {
focus: true
Keys.onReturnPressed: {
console.log("==========")
event.accepted = true
}
}
}
The output is:
++++++++++
==========
What is event.accepted = true invalid?
I want to intercept keystroke events in Window and process the event on ly in Window (only output "=========="). How to do that?

Answer 1

You can't disconnect a method when you use onReturnPressed: {} definition.
You have to use Connections for that.
A quick example:
import QtQuick 2.9
import QtQuick.Controls 1.4
Item {
id: myItem
anchors.fill: parent
property bool acceptEvents: true
signal returnPressed()
Keys.onReturnPressed: returnPressed()
Connections {
id: connection
target: myItem
enabled: acceptEvents
onReturnPressed: {
console.log("++++++++++")
}
}
}
Window {
visible: true
width: 640
height: 480
title: qsTr("Hello World")
VolumeSlider {
id: obj
anchors.fill: parent
focus: true
Keys.onReturnPressed: {
console.log("==========")
event.accepted = true
}
Component.onCompleted: {
obj.acceptEvents = false; // Remove connections
}
}
}