Propagating pos through mouse events and QGraphicsProxyWidget



  • (PySide 1.1, Qt 4.8)
    I'm adding a QGraphicsWidget to a QGraphicsScene. I first add several QWidgets to the scene, which return a "QGraphicsProxyWidget":http://qt-project.org/doc/qt-4.8/qgraphicsproxywidget.html. I then add the proxyWidget to the layout, and finally set the layout to the QGraphicsWidget.

    QGraphicsScene -> QGraphicsWidget -> QGraphicsGridLayout -> QGraphicsProxyWidget -> QLabel

    I'm now trying to implement the "Undo":http://qt-project.org/doc/qt-4.8/tools-undoframework.html framework. In my QGraphicsScene class I override the mouseReleaseEvent:
    @def mouseReleaseEvent(self, event):
    if self.movingItem is not None and event.button() == QtCore.Qt.LeftButton:
    if self.oldPos != self.movingItem.pos(): # always fails with proxy
    self.itemMoved.emit(self.movingItem,self.oldPos)
    super(DiagramScene,self).mouseReleaseEvent(event)@

    However, the movingItem.pos() never changes, therefor the if statement never passes and signal never emits. This only happens when I click a widget/proxy item. If I click and drag elsewhere it returns the QGraphicsWidget, and the if statement passes.

    I've been trying to access the QGraphicsWidget from the proxy but that doesn't seem possible. Anyone worked around this? Suggestions?

    I'm now trying to hack the mousePressEvent and mouseMoveEvent to ignore the proxy and target the graphicswidget.



  • Ugly hack in mousePressEvent, ignoring QGraphicsProxyWidgets and mapping mousePos to 'any' QGraphicsWidget it intercepts. Of course this makes the assumption that the first graphicswidget that contains the point is the correct one and gets pushed to the undo stack.

    @
    ...
    if isinstance(self.movingItem,QtGui.QGraphicsProxyWidget):
    for item in self.items():

                if isinstance(item,QtGui.QGraphicsProxyWidget):
                    continue
                
                if isinstance(item,QtGui.QGraphicsWidget):
                    if item.contains(item.mapFromScene(mousePos)):
                        self.movingItem = item
                        break@

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