Question about order of execution by property change.
-
my code is like below.
ClassA.qml
@
Rectangle {
ClassB { id:b }
MouseArea {
onClicked: {
b.propX = false;
doSomething(); // A
}
}
}
@ClassB.qml
@
Rectangle {
property bool propX: true
onPropXChanged: doAnything(); // B
Rectangle {
visible: propX
onVisibleChanged: doWhatever(); // C
}
}
@if I click the mousearea of ClassA, what's the order of excution of the A~C?
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For me it would be C to A,
b.propX turns to false so it triggers doWhatever() which is topmost Item then triggers doAnything() and finally doSomething since it comes after b.propX = false.
To make sure you could have your functions as followed :
@function doSomething()
{
console.log( "doSomething" )
}function doAnything()
{
console.log( "doAnything" )
}function doWhatever()
{
console.log( "doWhatever" )
}@This way you can actually see what is the order and if it is always the same
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I don't know the internal workings of the engine enough to answer with confidence. My opinion is you should not depend on the order being the same: those things are processed by meta object calls, it might happen - for example - that the order is different on another machine, or on a different operating system.
There was a splendid series of blogs about QML engine on KDAB's blog. "A very interesting read":http://www.kdab.com/qml-engine-internals-part-1-qml-file-loading/.
