Blocked gui does not draw an qml item?

[raven-worx]

@PowerNow said in Blocked gui does not draw an qml item?:

Or is there a way to check it only once?

make the slot connected to the frameSwapped signal disconnect itself when it gets called

[Tom_H]

@PowerNow I solved a similar issue by using a Timer.

[KroMignon]

@PowerNow said in Blocked gui does not draw an qml item?:

(its a QFramebufferobject loaded via Loader

I'm not sure to understand how this works. Is the Loader a QML Loader instance?
Why is this loader not set asynchronous to true?

Loader {
    source: "myHeadyComponent.qml"
    asynchronous: true
    visible: status == Loader.Ready
}

[PowerNow]

@KroMignon Hi, I just added asynchronous: true but surprisingly no change.

[KroMignon]

@PowerNow This sounds very strange to me. I often use asynchronous with Loader, and it always works.

Does your huge QML component also includes Loader?

[PowerNow]

@KroMignon The loaded Qml component "only" consists of a big QFramebufferObject which loads a lot of data in the graphiccard and this blocks the gui. Further Loader are not included.

[Tom_H]

@PowerNow Then you are either doing something wrong or using a non-threaded render loop. By default there is a dedicated render thread and a dedicated main GUI thread. Loading of data to the graphics card should happen in the render thread and won't block the GUI.

Scene Graph and Rendering

[PowerNow]

@Tom_H I tried it with a timer but it also does not work.

Timer {
   id: iTim
   interval: 0
   running: false
   repeat: false
   triggeredOnStart: true
   onTriggered: {
        console.log("onTriggered");
        iBut1.mTxt = "wait"
    }
}

Without triggeredOnStart: true the triggerSignal is fired after the heavyFunct() is finished.

[PowerNow]

@Tom_H How can I found out that I'm using a non-threaded render loop? In the QQuickFrambufferObject I'm using of course the QQuickFramebufferObject::Renderer.

"Communication between the item and the renderer should primarily happen via the QQuickFramebufferObject::Renderer::synchronize() function. This function will be called on the render thread while the GUI thread is blocked."

It's still not clear how the gui and scene graph render works together. Based on the Qt arcticles it seems so that the scene graph render blocks the gui during rendering.

Is the gui blocked during upload of big Vertex/Index buffer objects?

[PowerNow]

For who is interessted, I handle the problem by using the pressed() signal.

MouseArea  {
    property bool mRed: false

    onClicked: {
       heavyFunct();
       mRed = false;
    }
    onPressed: {
       mRed = true;
    }
    onReleased: {
       mRed = false;
    }
}