QListWidget drag and drop

[GrahamL]

Hi
I have a QListWidget that has drag and drop enabled and I am able to drag an item onto it (from another widget) and have it added to the list
My problem is that if I drag an item within the list the item being dragged replaces the item underneath, whereas I want to just change the order.

Has anyone got any ideas as to what is happening here

Cheers

[mrjj]

have a look at this
https://forum.qt.io/topic/1786/qlistwidget-reorder-with-drag-and-drop/3

I think setDragDropMode(QAbstractItemView::InternalMove); is the key.

[GrahamL]

@mrjj
Hi Thanks for your reply
I did try setting the mode to internal move but then I cant drag from from an external widget

Cheers

[mrjj]

oh, well the name kinda suggested that now you tell me ;)

Sorry, did never try to mix both internal and external drop. But I do understand why you want it.
Maybe you can handle it yourself ?

[mrjj]

@mrjj said:
This class allows to rearrange internally and drop from other list by
changing setDragDropMode on the fly.
For easy use , use the promote feature.
Sorry for the lame name.

myhappylist.h

#ifndef MYHAPPYLIST_H
#define MYHAPPYLIST_H
#include <QListWidget>
#include <QDragEnterEvent>

class myhappylist : public QListWidget
{
public:
    explicit myhappylist(QWidget *parent = 0) : QListWidget(parent) { }
 
    ~myhappylist();
protected:
    void dragEnterEvent(QDragEnterEvent *event);
};

myhappylist.cpp

void myhappylist::dragEnterEvent ( QDragEnterEvent *event )
{
	if ( event->source() != this ) {		
		setDragDropMode ( QAbstractItemView:: DragDrop );
               event->accept();
	} else {
		setDragDropMode ( QAbstractItemView::InternalMove );
		event->accept();

	}

}
myhappylist::~myhappylist(){}

[GrahamL]

Thanks - I'll give it a go tomorrow

[GrahamL]

Thanks

All working now

[Ostropik]

I have the same issue. When i make custom class
Solved by implementing all D&D parent events. (But in any topic two enough)

DndListWidget : public QListWidget
{
    void dragEnterEvent(QDragEnterEvent *event) override;
    void dropEvent(QDropEvent *event) override;
    // if this two will not be implemented DnD will works not properly
    void dragMoveEvent(QDragMoveEvent* event) override;
    void startDrag(Qt::DropActions supportedActions)  override; 
}

@mrjj Thanks for "if ( event->source() != this )" ))