Drag and Drop into empty widget space

Vagabond

I would like to know whether or not it is possible to drag and drop into (what I want to refer to as) empty widget space.

To be more precise:

I have defined a MultiTrackPlayer class derived from QWidget. This Player dynamically adds a PlayerControls (play button/pause button/...) for each track added to it. At this point adding new PlayerControls is triggered by button press and then delivering a QUrl, which references the media file to be played, to the MultiTrackPlayer. I would like to replace the button click, by dragging Urls into the yet to be filled layout space of my MultiTrackMediaPlayer.

I successfully implemented drag and drop on my custom QListView, overriding

void mousePressEvent(QMouseEvent *event);
void mouseMoveEvent(QMouseEvent *event);
void dragEnterEvent(QDragEnterEvent *event);
void dragMoveEvent(QDragMoveEvent *event);
void dropEvent(QDropEvent *event);

and setting

setAcceptDrops(true);

Using the same procedure on MultiTrackPlayer does not give me any ability to perform the above described behaviour. I am assuming that is because the empty layout space is not treated as a legal drop site!?

How would I handle this correctly, can anyone point me into the right direction?

Thanks! =)

mrjj

hi
can u show the empty widget space?

Vagabond

@mrjj
The empty space you see in the attached image is basically the layout which all PlayerControls are added to, held by a QGroupBox titled "Players:".
That being said, do I have to configure my drag and drop functionality on the QGroupBox rather then the MultiTrackPlayer?

Vagabond

Okay I added a class derived from QGroupBox to host my drop events

void dragEnterEvent(QDragEnterEvent *event);
void dragMoveEvent(QDragMoveEvent *event);
void dropEvent(QDropEvent *event);

using this groupbox to hold the MultiTrackPlayer layout gives me the functionality I was looking for. Thanks @mrjj for the comment. Replying to it inspired me to try that out.

=)

mrjj

@Vagabond
Heh. good work.

Just as a note:
you can use event filters to implement drag and drop on other widgets if
no other need to subclass them.

http://ynonperek.com/course/qt/event-filter2.html

But for your case, subclassing QGroupBox is super.