右键单击上下文菜单会访问错误的目录

Question

当我在树形视图中右键单击文件时，上下文菜单及其底层方法起作用。

但是，当我右键单击空白区域并打开上下文菜单时，删除和归档方法将应用于我的工作文件夹本身（即test_gui.py文件的存储位置）。

我可以在空的空间上弹出上下文菜单，但是我不希望它在这种情况下能够执行任何操作。

from PyQt5 import QtCore, QtGui, QtWidgets
import sys
import os
import send2trash
import shutil

class Ui_MainWindow(QtWidgets.QWidget):
    def setupUi(self, MainWindow):
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)

        # Treeview model, path should contain files for test purpose
        path = r"C:\Test_gui"
        self.fileModel = QtWidgets.QFileSystemModel()
        self.fileModel.setReadOnly(False)

        # Treeview functionality
        self.treeView = QtWidgets.QTreeView(self.centralwidget)
        self.treeView.setModel(self.fileModel)
        self.treeView.setRootIndex(self.fileModel.setRootPath(path))
        self.treeView.setGeometry(QtCore.QRect(190, 130, 541, 381))
        self.treeView.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
        self.treeView.customContextMenuRequested.connect(self.openMenu)

        MainWindow.setCentralWidget(self.centralwidget)
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate


    def delete(self, index):
        """ Send the selected file to the recycle bin"""
        path = self.fileModel.fileInfo(index).absoluteFilePath()
        # When context menu is opened (right click) on a file, send2trash 
        # sends file to the bin. However, if context menu is open on empty 
        # space, delete method sends my working directory to the bin. 
        print(os.path.abspath(path))
        # send2trash.send2trash(os.path.abspath(path))


    def archive(self, index):
        """Move selected file to archive"""
        source = self.fileModel.fileInfo(index).absoluteFilePath()
        destination = r"C:\Test_gui_archive"
        # Same as above, but the archive method sends the working directory 
        # to archive.
        print(os.path.abspath(source))
        # shutil.move(os.path.abspath(source), os.path.abspath(destination))


    def openMenu(self, position):
        """Setup a context menu to open upon right click."""
        index = self.treeView.indexAt(position)
        menu = QtWidgets.QMenu(self)
        delete_action = menu.addAction("Send to trashbin")
        archive_action = menu.addAction("Move to archive")
        action = menu.exec_(self.treeView.viewport().mapToGlobal(position))
        if action == delete_action:
            self.delete(index)
        if action == archive_action:
            self.archive(index)


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

[尝试从this线程应用逻辑，但未成功。建议将不胜感激！

Answer 1

为了确认您处于空白处，可以使用索引，因为它将无效。

据此，您可以做出几个决定：

• 禁用QAction：

  def openMenu(self, position):
      """Setup a context menu to open upon right click."""
      index = self.treeView.indexAt(position)
      menu = QtWidgets.QMenu(self)
      delete_action = menu.addAction("Send to trashbin")
      archive_action = menu.addAction("Move to archive")
      for action in (delete_action, archive_action):
          action.setEnabled(index.isValid())
      action = menu.exec_(self.treeView.viewport().mapToGlobal(position))
      if action == delete_action:
          self.delete(index)
      if action == archive_action:
          self.archive(index)

• 或不显示QMenu：

  def openMenu(self, position):
      """Setup a context menu to open upon right click."""
      index = self.treeView.indexAt(position)
      if not index.isValid():
          return
      menu = QtWidgets.QMenu(self)
      delete_action = menu.addAction("Send to trashbin")
      archive_action = menu.addAction("Move to archive")
      action = menu.exec_(self.treeView.viewport().mapToGlobal(position))
      if action == delete_action:
          self.delete(index)
      if action == archive_action:
          self.archive(index)

---

_{注：我建议您不要修改Qt Designer生成的代码，而是实现一个从适当的小部件继承的新类，并使用初始类来填充它。有关更多信息，请阅读this和Using the Generated Code。}