Python QTreeView.mouseMoveEvent方法代码示例

# 需要导入模块: from PyQt4.Qt import QTreeView [as 别名]
# 或者: from PyQt4.Qt.QTreeView import mouseMoveEvent [as 别名]
 def mouseMoveEvent(self, event):
     dex = self.indexAt(event.pos())
     if self.in_drag_drop or not dex.isValid():
         QTreeView.mouseMoveEvent(self, event)
         return
     # Must deal with odd case where the node being dragged is 'virtual',
     # created to form a hierarchy. We can't really drag this node, but in
     # addition we can't allow drag recognition to notice going over some
     # other node and grabbing that one. So we set in_drag_drop to prevent
     # this from happening, turning it off when the user lifts the button.
     self.in_drag_drop = True
     if not self._model.flags(dex) & Qt.ItemIsDragEnabled:
         QTreeView.mouseMoveEvent(self, event)
         return
     md = self._model.mimeData([dex])
     pixmap = dex.data(Qt.DecorationRole).toPyObject().pixmap(25, 25)
     drag = QDrag(self)
     drag.setPixmap(pixmap)
     drag.setMimeData(md)
     if self._model.is_in_user_category(dex):
         drag.exec_(Qt.CopyAction|Qt.MoveAction, Qt.CopyAction)
     else:
         drag.exec_(Qt.CopyAction)

# 需要导入模块: from PyQt4.Qt import QTreeView [as 别名]
# 或者: from PyQt4.Qt.QTreeView import mouseMoveEvent [as 别名]
    def mouseMoveEvent(self, event):
        if self.drag is not None:
            QTreeView.mouseMoveEvent(self, event)
            return
        if ((event.globalPos() - self.mouse_press_qpoint).manhattanLength()
            < QApplication.startDragDistance()):
            return
        #
        # starting a drag
        # [logic bug, after bruce change 070507: should not do this
        #  if we already started dragging out a selection. How can we tell?
        #  Only by whether the initial press had eventInRect, I think
        #  (not yet recorded), or at least, the initial move (#e could record here).]
        #
        index = self.indexAt(event.pos())

        sellst = self.selectedList() # bruce 070507 move earlier

        DEBUG2 = True

        if index.isValid():
            thisnode = index.internalPointer().node

            #bruce 070507 bring in some code from modelTreeGui.py
            alreadySelected = (thisnode in sellst)

            item = index.internalPointer()
            rect = self.visualRect(index)
            if DEBUG2:
                print "visualRect coords",rect.left(), rect.right(), rect.top(), rect.bottom()
            qfm = QFontMetrics(QLineEdit(self).font())
            rect.setWidth(qfm.width(item.node.name) + _ICONSIZE[0] + 4)
            if DEBUG2:
                print "visualRect coords, modified:",rect.left(), rect.right(), rect.top(), rect.bottom()
                # looks like icon and text, a bit taller than text (guesses)
            eventInRect = rect.contains(event.pos())
            if DEBUG2:
                print "valid index: eventInRect = %r, item = %r, index = %r, alreadySelected = %r" % \
                      (eventInRect, item, index, alreadySelected)#######
        else:
            thisnode = item = None
            alreadySelected = eventInRect = False

        if not eventInRect:
            # nothing to drag, but [bruce 070507] let super handle it (for dragging over nodes to select)
            self.drag_is_not_DND = True ### not yet used
            QTreeView.mouseMoveEvent(self, event)
            return

        if thisnode in sellst:
            # if dragging something selected, drag along all other selected ones
            dragged_nodes = sellst
        else:
            # if dragging something unselected, ignore any selected ones
            dragged_nodes = [ thisnode ]
        qdrag = QDrag(self)
        drag_type = 'move'  # how do I decide between 'move' and 'copy'?
        self.drag = (dragged_nodes, drag_type, qdrag)
        mimedata = QMimeData()
        mimedata.setText("need a string here for a valid mimetype")
        qdrag.setMimeData(mimedata)
        display_prefs = { }
        pixmap = dragged_nodes[0].node_icon(display_prefs)
        qdrag.setPixmap(pixmap)
        qdrag.setHotSpot(QPoint(-8, 8))
        qdrag.start()