在qtreewidget中獲取拖放源和目的地

Question

我在QTreeWidget中有簡單的樹（我使用pyqt，但我認爲它不重要）。當我在此樹中移動項目時，我想更改數據庫，所以我想要在移動之前獲取此項目對象，此項目的父項以及此項目的父項。但我不明白我怎麼能得到它們。 qtreewidget沒有特別的拖放信號。

Answer 1

我找到了我的情況的答案。可能有些人可能會感興趣：

class Ui_MainWindow(object): # automatically generated with pyuic5 
    def setupUi(self, MainWindow): 
     ... 
     self.recordsTree = QtWidgets.QTreeWidget(self.centralWidget) 
     ... 

class CustomTree(object): 
    def startDrag(self, actions): 
     row = self.selectedItems()[0] 
     self._prev_parent = row.parent().data(0, 0) 
     self._what_move = row.data(0,0) 
     return QTreeWidget.startDrag(self, actions) 
    def dropEvent(self, event): 
     row_index = self.indexAt(event.pos()).row() 
     self._new_parent = self.topLevelItem(row_index).data(0, 0) 
     my_custom_collback(self._prev_parent, self._what_move, self._new_parent) # <- that what i needed 
     return QTreeWidget.dropEvent(self, event) 


class MainWindow(Ui_MainWindow): 
    def setupUi(self, m): 
     r = super(MainWindow, self).setupUi(m) 
     self.recordsTree.startDrag = types.MethodType(CustomTree.startDrag, self.recordsTree) 
     self.recordsTree.dropEvent = types.MethodType(CustomTree.dropEvent, self.recordsTree) 
     return r