drag_drop blocks drag_select, please help

[zl2k]

hi, there
I need to drag_select a group of icons in the qlistwidget and then drag_drop to another widget. Just by setting the properties of the qlistwidget, I can almost do that: I can drag_select and then drag on to another widget but can't drop. Then I did some search on the net and add a MyListWgt class so that the qlistwidget can promote to MyListWgt. After I did that, I can drag and drop but no longer can drag_select (I still can do multiple selections by click items individually). Please help.
Here is the code of the MyListWgt

#include "mylistwgt.h"
 
MyListWgt::MyListWgt(QWidget *parent): QListWidget(parent)
{
}
 
 
MyListWgt::~MyListWgt()
{
}
 
QStringList MyListWgt::mimeTypes () const
{
  QStringList qstrList;
  qstrList.append("text/uri-list");
  return qstrList;
}
 
void MyListWgt::mouseMoveEvent(QMouseEvent *event)
{
	if (!(event->buttons() & Qt::LeftButton)) return;
 
  // if no item selected, return (else it would crash)
  if (currentItem() == NULL) return;
 
  QDrag *drag = new QDrag(this);
  QMimeData *mimeData = new QMimeData;
 
  // construct list of QUrls
  // other widgets accept this mime type, we can drop to them
  QList<QUrl> list;
  list.append(QUrl(currentItem()->text())); // only QUrl in list will be text of actual item
 
  // mime stuff
  mimeData->setUrls(list); 
  drag->setMimeData(mimeData);
 
  // start drag
  drag->start(Qt::CopyAction | Qt::MoveAction);
}
 
Qt::DropActions MyListWgt::supportedDropActions () const
{
  // returns what actions are supported when dropping
  return Qt::CopyAction | Qt::MoveAction;
}

#include "mylistwgt.h"

MyListWgt::MyListWgt(QWidget *parent): QListWidget(parent)
{
}


MyListWgt::~MyListWgt()
{
}

QStringList MyListWgt::mimeTypes () const
{
  QStringList qstrList;
  qstrList.append("text/uri-list");
  return qstrList;
}
 
void MyListWgt::mouseMoveEvent(QMouseEvent *event)
{
	if (!(event->buttons() & Qt::LeftButton)) return;
 
  // if no item selected, return (else it would crash)
  if (currentItem() == NULL) return;
  
  QDrag *drag = new QDrag(this);
  QMimeData *mimeData = new QMimeData;
 
  // construct list of QUrls
  // other widgets accept this mime type, we can drop to them
  QList<QUrl> list;
  list.append(QUrl(currentItem()->text())); // only QUrl in list will be text of actual item
 
  // mime stuff
  mimeData->setUrls(list); 
  drag->setMimeData(mimeData);
 
  // start drag
  drag->start(Qt::CopyAction | Qt::MoveAction);
}

Qt::DropActions MyListWgt::supportedDropActions () const
{
  // returns what actions are supported when dropping
  return Qt::CopyAction | Qt::MoveAction;
}

To copy to clipboard, switch view to plain text mode 

Here is the header file

#ifndef MYLISTWGT_H
#define MYLISTWGT_H
 
#include <QtGui>
#include <QListWidget>
#include <QStringList>
#include <fstream>
#include <iomanip>
#include <iostream>
 
/**
	@author 
*/
 
using namespace std;
 
class MyListWgt : public QListWidget{
	Q_OBJECT;
 
	public:
    MyListWgt(QWidget *parent = 0);
 
    ~MyListWgt();
 
		QStringList mimeTypes() const;
		Qt::DropActions supportedDropActions () const;
		void mouseMoveEvent(QMouseEvent *event);
};
 
#endif

#ifndef MYLISTWGT_H
#define MYLISTWGT_H

#include <QtGui>
#include <QListWidget>
#include <QStringList>
#include <fstream>
#include <iomanip>
#include <iostream>

/**
	@author 
*/

using namespace std;

class MyListWgt : public QListWidget{
	Q_OBJECT;
	
	public:
    MyListWgt(QWidget *parent = 0);

    ~MyListWgt();

		QStringList mimeTypes() const;
		Qt::DropActions supportedDropActions () const;
		void mouseMoveEvent(QMouseEvent *event);
};

#endif

To copy to clipboard, switch view to plain text mode 

Thanks for your comments.

zl2k

[wysota]

Why did you reimplement the mouseMove event? It's enough to reimplement QListWidget::mimeData() to provide your own mime data for items in the list.

[zl2k]

Ok, I blocked the reimplement of mouseMove event and reimplement QListWidget::mimeData() as following:

QMimeData * MyListWgt::mimeData ( const QList<QListWidgetItem *> items ) {
	QList<QUrl> list;
  list.append(QUrl(currentItem()->text())); // only QUrl in list will be text of actual item
 
  // mime stuff
  QMimeData *mimeData = new QMimeData;
  mimeData->setUrls(list); 
  return mimeData;
}

QMimeData * MyListWgt::mimeData ( const QList<QListWidgetItem *> items ) {
	QList<QUrl> list;
  list.append(QUrl(currentItem()->text())); // only QUrl in list will be text of actual item
 
  // mime stuff
  QMimeData *mimeData = new QMimeData;
  mimeData->setUrls(list); 
  return mimeData;
}

To copy to clipboard, switch view to plain text mode 

It did not solve the problem. The icons in the listwidget are not consistent after drap&drop (sometimes missing the caption with only icons shown, sometimes missing both). What I want is just pass the selected item info into the drop window with the items in the drag windown unchanged (like copy, but don't really duplicate the items).

[wysota]

Did you reimplement dropMimeData() as well?