QWidget movement

[fakefish]

Hello,
I am trying to catch the event when my window is being moved by the user.
I want to make my widget semi-visible while moving.

The moveevent only gives position updates not status.
And mouse events cannot be catched from title bar.
Qt::WA_PendingMoveEvent is also not set when moving the widget.

Please help,

[high_flyer]

The moveevent only gives position updates not status.

What do you mean by 'status'?

[fakefish]

moveEvent gives old and new positions but I couldn't finf a way to get the moving status.

[high_flyer]

What is 'moving status'?

[BalaQT]

hi,
@high_flyer,
i think , he wants to know
1)how to know, when the user started to move the window(this is pretty easy, moveEvent will help) (window move started)
2)how to know, user stops moving the window. (window move ended)

I want to make my widget semi-visible while moving.

his goal is to show a transparent window, when it is moved.

@fakefish:
just a hints, not the direct answer though, we can use moveevent and a timer or eventfilter to achieve the goal.(not the best logic though)
Bala

[high_flyer]

In that case you can use mouseReleaseEvent to know when user let go of the window.
mouseMoveEvent() will tell you when it started.

[fakefish]

In that case you can use mouseReleaseEvent to know when user let go of the window.
mouseMoveEvent() will tell you when it started.

Widget does not capture mouse events on the title bar.

---

Added after 17 minutes:

@fakefish:
just a hints, not the direct answer though, we can use moveevent and a timer or eventfilter to achieve the goal.(not the best logic though)
Bala

Thanks, I tried it does not seem bad, but its processor usage is huge

[BalaQT]

hi,

Thanks, I tried it does not seem bad, but its processor usage is huge

how about this, install a eventfilter and start the timer only at the window move event.

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    bMove=false;
    connect(&t,SIGNAL(timeout()),this,SLOT(Trans()));
    t.setInterval(50);
    installEventFilter(this);
}
bool MainWindow::eventFilter(QObject *obj, QEvent *evt)
{
    bMove=false;
    if(evt->type()==QEvent::Move)
    {
        bMove=true;
        if(!t.isActive())
        {
            t.start();
        }
    }
}
 
void MainWindow::Trans()
{
    if(bMove)
    {
        //make window transparent 
    }
    else
    {
        t.stop();
        //make window normal
    }
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    bMove=false;
    connect(&t,SIGNAL(timeout()),this,SLOT(Trans()));
    t.setInterval(50);
    installEventFilter(this);
}
bool MainWindow::eventFilter(QObject *obj, QEvent *evt)
{
    bMove=false;
    if(evt->type()==QEvent::Move)
    {
        bMove=true;
        if(!t.isActive())
        {
            t.start();
        }
    }
}

void MainWindow::Trans()
{
    if(bMove)
    {
        //make window transparent 
    }
    else
    {
        t.stop();
        //make window normal
    }
}

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not a straight forward solution, but hope it helps,
bala

[fakefish]

how about this, install a eventfilter and start the timer only at the window move event.

Thanks that also worked. The CPU usage increase caused by repainting transparent window, I believe.

Fakefish