Stick a widget to the mouse while Drag N Drop?

m1212e

Hey,

I'm trying to make a widget Drag N Dropable. Works fine so far, all the events get fired properly. But I want a cool "animated" drag widget which sticks to the mouse as the user is dragging. I thought maybe the best way is to start a thread which repeatedly sets the widget to the cursor position as soon as the widget is clicked and dragged.
I'd start it in the mouseMoveEvent(QMouseEvent *e) and would set the stop flag in the dropEvent(QDropEvent *e). So I havent looked at the threads yet and if you got any tips there I would appreciate it, but my more important problem is that I don't know how to set a widget absolutely to a position. It should be ripped out of it's layout and then be displayed above every other widget, as long as the drag goes.
Is that the way to approach it? Or am I missing a thing here?

Alternatively I thought about just setting the cursor to a corresponding Pixmap, but that would prevent any animations and seems a bit hacky to me.

Thanks for any suggestions :D

SGaist

Hi,

If you are creating your own QDrag object then you can use QDrag::setPixmap and put there the rendered version of your widget.

m1212e

Okay, thank you, that kinda works.

But now I've got this ugly background and the hover effect is captured when I start dragging it. I probably need to store a not interacted pixmap in my object when it gets created so I haven't got the hover effect in my render. But do you have an idea how to get rid of the background? I've found a thread, you contributed to it, but I couldn't really understand what I have to do..
Thanks for your help!

Edit: So that worked for me. Got rid of the hover effect by simply rendering the widget in it's show event and storing the pixmap inside a member. Still got that background tho.

Pl45m4

@m1212e said in Stick a widget to the mouse?:

Still got that background tho

Have you tried to set a translucent background before rendering your widget? I think, this is what the OP in your linked thread also did

setAttribute(Qt::WA_TranslucentBackground);

m1212e

Must have missed it. Thank you very much! Works fine now :D

Pl45m4

@m1212e said in Stick a widget to the mouse?:

but I couldn't really understand what I have to do

The code sample posted by the OP shows a section from a version control system (like Git) change log file.
The + (green background) lines indicate insertions.
So, if you know what to look for, it takes 3 seconds, until you know what's going on there :-)
In case you didnt know that :-)