I've got QMainWindow, QGraphicsScene, QPushButton.
The problem is drag&drop only works for QPushButtons which are in QMainWindow, not for QPushButtons in QGraphicsScene.
Any hints?
Maybe i should to something with QGraphicsProxyWidget and dragEnterEvent(QGraphicsSceneDragDropEvent * event), but how?

Here is my code:
Qt Code: 
  1. MainWindow::MainWindow(QWidget *parent) :
  2.     QMainWindow(parent),
  3.     ui(new Ui::MainWindow)
  4. {
  5.     ui->setupUi(this);
  6.  
  8.     QGraphicsWidget *textEdit = scene->addWidget(new QTextEdit("textedit"));
  9.     QGraphicsWidget *pushButton1 = scene->addWidget(new QPushButton("pushbutton1"));
  10.     QGraphicsWidget *pushButton2 = scene->addWidget(new QPushButton("pushbutton2"));
  11.     QGraphicsWidget *pushButton3 = scene->addWidget(new myGraphicsWidget(0));
  12.     QGraphicsWidget *pushButton4 = scene->addWidget(new myGraphicsWidget(0));
  13.     pushButton4->setAcceptDrops(true);
  14.  
  15.     QGraphicsLinearLayout *layout = new QGraphicsLinearLayout(Qt::Vertical);
  16.  
  17.     layout->addItem(textEdit);
  18.     layout->addItem(pushButton1);
  19.     layout->addItem(pushButton2);
  20.     layout->addItem(pushButton3);
  21.     layout->addItem(pushButton4);
  22.  
  23.     QGraphicsWidget *form = new QGraphicsWidget;
  24.     form->setLayout(layout);
  25.     scene->addItem(form);
  26.  
  27.     QGraphicsView *view = new QGraphicsView(this);
  28.     view->setScene(scene);
  29.     view->setAcceptDrops(true);
  30.  
  31.     QVBoxLayout* layoucik = new QVBoxLayout();
  32.     layoucik->addWidget(new myGraphicsWidget(0));
  33.     layoucik->addWidget(new myGraphicsWidget(0));
  34.     layoucik->addWidget(view);
  35.  
  36.     QWidget* widget = new QWidget;
  37.     widget->setLayout(layoucik);
  38.  
  39.     this->setCentralWidget(widget);
  40. }
  41.  
  42. MainWindow::~MainWindow()
  43. {
  44.     delete ui;
  45. }
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and

Qt Code: 
  1. #include "mygraphicswidget.h"
  2. #include <QDrag>
  3. #include <QMimeData>
  4.  
  5.  
  6. myGraphicsWidget::myGraphicsWidget(QWidget* parent) : QPushButton("test", parent)
  7. {
  8.     setAcceptDrops(true);
  9. }
  10.  
  11. void myGraphicsWidget::mousePressEvent(QMouseEvent *event)
  12. {
  13.     QPoint hotSpot = event->pos();
  14.     QMimeData *mimeData = new QMimeData;
  15.     mimeData->setText("aaabbcc");
  16.  
  17.     QDrag *drag = new QDrag(this);
  18.     drag->setMimeData(mimeData);
  19.     drag->setHotSpot(hotSpot);
  20.  
  21.     Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction);
  22. }
  23.  
  24. void myGraphicsWidget::mouseMoveEvent(QMouseEvent *event)
  25. {
  26.  
  27. }
  28.  
  29. void myGraphicsWidget::dragEnterEvent(QDragEnterEvent *event)
  30. {
  31.     if (event->mimeData()->hasText())
  32.     {
  33.         event->accept();
  34.     }
  35. }
  36.  
  37.  
  38. void myGraphicsWidget::dropEvent(QDropEvent *event)
  39. {
  40.     if (event->mimeData()->hasText())
  41.     {
  42.         this->setText("aaa"+event->mimeData()->text());
  43.     }
  44. }
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regards,
DizL