[PySide] moving QGraphicsPixmapItem jumps to upper left corner of scene

[Sergey Krasilnikov]

you try to overload QGraphicsPixmapItem.mouseReleaseEvent(self, e) but
forget call origin method

   def mouseReleaseEvent(self,e):
       self.setSelected(False)
       QtGui.QGraphicsPixmapItem.mouseReleaseEvent(self, e) *# << add this
line*



2012/6/16 Jason Augustyn <js.augustyn at gmail.com>:
> I am writing an application that allows a user to place images on a
> QGraphicsScene (contained within a QGraphicsView) by clicking on a
> blank area and then move them about using mousemoveevent. The images
> are created using a subclassed QGraphicsPixmapItem.
>
> Here's the problem: The very first attempt at moving an item works as
> expected. However, for all subsequent moves the selected item
> immediately jumps to the upper left corner of the scene. Here is the
> code:
>
> import sys
> from PySide import QtGui,QtCore
>
> class TestPixmapItem(QtGui.QGraphicsPixmapItem):
>     def __init__(self, imagename, position, parent=None):
>         QtGui.QGraphicsPixmapItem.__init__(self, parent)
>
>         px = QtGui.QPixmap(imagename)
>         self.setPixmap(px)
>
>         self.setFlag(QtGui.QGraphicsItem.ItemIsMovable, True)
>         self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, True)
>
>         # set position
>         self.setPos(position.x(),position.y())
>
>     def mouseReleaseEvent(self,e):
>         self.setSelected(False)
>
>     def mouseMoveEvent(self, e):
>         QtGui.QGraphicsPixmapItem.mouseMoveEvent(self, e)
>
>
> class GfxScene(QtGui.QGraphicsScene):
>     def __init__(self, parent=None):
>         #build parent user interface
>         super(GfxScene, self).__init__(parent)
>
> def mousePressEvent(self, e):
>         if(self.itemAt(e.scenePos().x(),e.scenePos().y()) == None):
>             pixmapItem = TestPixmapItem('test.png',e.scenePos())
>             self.addItem(pixmapItem)
>         else:
>             QtGui.QGraphicsScene.mousePressEvent(self,e);
>
>
> class MainForm(QtGui.QMainWindow):
>     def __init__(self, parent=None):
>         super(MainForm, self).__init__(parent)
>
>         scene = GfxScene(self)
>         scene.setSceneRect(QtCore.QRect(0, 0, 800, 800))
>
>         view = QtGui.QGraphicsView()
>         view.setScene(scene)
>         #view.setSceneRect(QtCore.QRect(0, 0, 800, 800))
>         #view.setGeometry(QtCore.QRect(0, 0, 800, 800))
>         self.setCentralWidget(view)
>
>
> def main():
>     #This function means this was run directly, not called from
> another python file.
>     app = QtGui.QApplication.instance()
>     if app == None:
>             app = QtGui.QApplication(sys.argv)
>     myapp = MainForm()
>     myapp.show()
>
>     sys.exit(app.exec_())
>
>
> if __name__ == '__main__':
>     main()
>
>
> Any help would be appreciated!
>
> Thanks in advance!
> _______________________________________________
> PySide mailing list
> PySide at qt-project.org
> http://lists.qt-project.org/mailman/listinfo/pyside



-- 
Regards
Sergey Krasilnikov
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