在qtreewidget

Question

我在QTreeWidget中有简单的树（我使用pyqt，但我觉得它并不重要）。当我在这个树中移动项目时，我想要更改数据库，所以我希望在移动之前获取此项目对象，此项目的父项以及此项目的父项。但我不明白我是如何得到它们的。 qtreewidget没有特殊的拖放信号。

Answer 1

我找到了我的情况的答案。可能有些人可能感兴趣：

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