python - 在多个 QTableView 上创建不同的上下文菜单

Question

我在 QMainWindow 中有两个 QTableView，我想在其中一个上创建一个上下文菜单，然后在另一个上创建另一个上下文菜单。

到目前为止，创建上下文菜单并定义操作是有效的。但上下文菜单会在整个应用程序内的任何地方弹出。我不知道如何将其限制为只有一张特定的表。我认为这与 contextMenuEvent() 有关，它是 QMainWindow 的成员，但我不知道如何更改这部分。尝试创建继承 QTableView 的自定义类没有成功，因为我不确定从哪里开始。

这是我尝试过的:

populate_table_1() 和 populate_table_2() 方法仅用于将一些数据填充到表中。 get_selected_item_TV1() 方法从 table_1 的一行中获取必要的数据。 delete_file() 方法是我在从 contextMenuEvent() 方法调用删除操作时想要执行的操作的示例。到目前为止，此代码有效，但我希望仅当我右键单击 table_1 的一行时才弹出上下文菜单，并且在右键单击其他地方时根本不显示该菜单。

from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *



data_1 = ["file_name", "file_infos"]
data_2 = ["other_stuff_1", "other_stuff_2"]


class Ui_MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle("MyApp")
        self.resize(450, 280)
        centralwidget = QWidget(self)

        #]===================================================================[#

        # table_1
        table_1 = QTableView(
            centralwidget,
            selectionBehavior=QAbstractItemView.SelectRows,
            editTriggers=QAbstractItemView.NoEditTriggers
        )
        # table_1 models
        self.modelTV1 = QStandardItemModel(0, 2, centralwidget)
        self.modelTV1.setHorizontalHeaderLabels(["column 1", "column 2"])
        table_1.setModel(self.modelTV1)

        self.selectionModelTV1 = table_1.selectionModel()

        #]===================================================================[#

        # table_2
        table_2 = QTableView(
            centralwidget,
            selectionBehavior=QAbstractItemView.SelectRows,
            editTriggers=QAbstractItemView.NoEditTriggers,
        )
        # table_2 models
        self.modelTV2 = QStandardItemModel(0, 2, centralwidget)
        self.modelTV2.setHorizontalHeaderLabels(["column 1", "column 2"])
        table_2.setModel(self.modelTV2)

        self.selectionModelTV2 = table_2.selectionModel()

        v_Layout1 = QVBoxLayout()
        v_Layout1.addWidget(table_1)
        v_Layout1.addWidget(table_2)
        gridLayout = QGridLayout(centralwidget)
        gridLayout.addLayout(v_Layout1, 0, 0, 1, 1)
        self.setCentralWidget(centralwidget)


    def populate_table_1(self):
        self.modelTV1.setRowCount(0)
        for item in data_1:
            self.modelTV1.insertRow(0)
            for i, text in enumerate(data_1):
                self.modelTV1.setItem(0, i, QStandardItem(text))


    def populate_table_2(self):
        self.modelTV2.setRowCount(0)
        for item in data_2:
            self.modelTV2.insertRow(0)
            for i, text in enumerate(data_2):
                self.modelTV2.setItem(0, i, QStandardItem(text))


    def contextMenuEvent(self, event):
        self.contextMenu = QMenu(self)
        deleteAction = QAction("Delete", self)

        self.contextMenu.addAction(deleteAction)
        deleteAction.triggered.connect(lambda: self.delete_file(event))

        self.contextMenu.popup(QCursor.pos())


    def get_selected_item_TV1(self):
        # get the row's text from the first column in table_1
        listed_items = self.selectionModelTV1.selectedRows()
        for index in listed_items:
            selected_item = index.data()
            return f"table_1 - row_{index.row()} - {selected_item}"


    def delete_file(self, event):
        item = self.get_selected_item_TV1()
        print(f"Deleting: {item}")



if __name__ == "__main__":
    import sys

    app = QApplication(sys.argv)
    mainUI = Ui_MainWindow()

    mainUI.populate_table_1()
    mainUI.populate_table_2()
    mainUI.show()

    sys.exit(app.exec_())

Answer 1

有很多替代方案:

• 检测鼠标按下时是否处于某个区域，例如第一个QTableView。在这种情况下，小部件必须可以在 contextMenuEvent() 中访问，因此您必须将 table_1 更改为 self.table_1，然后使用 underMouse():

  def contextMenuEvent(self, event):
      if self.table_1.underMouse():
          self.contextMenu = QMenu(self)
          deleteAction = QAction("Delete", self)
  
          self.contextMenu.addAction(deleteAction)
          deleteAction.triggered.connect(lambda: self.delete_file(event))
  
          self.contextMenu.popup(QCursor.pos())
  

• 为每个QTableView实现contextMenuEvent方法:

  class TableView(QTableView):
      def contextMenuEvent(self, event):
          self.contextMenu = QMenu(self)
          deleteAction = QAction("Delete", self)
  
          self.contextMenu.addAction(deleteAction)
          deleteAction.triggered.connect(lambda: self.delete_file(event))
  
          self.contextMenu.popup(QCursor.pos())
  
      def get_selected_item_TV1(self):
          # get the row's text from the first column in table_1
          listed_items = self.selectionModel().selectedRows()
          for index in listed_items:
              selected_item = index.data()
              return f"table_1 - row_{index.row()} - {selected_item}"
  
      def delete_file(self, event):
          item = self.get_selected_item_TV1()
          print(f"Deleting: {item}")
  

  然后您必须将 table_1 = QTableView(... 更改为 table_1 = TableView(...

• 另一种选择是使用 customContextMenuRequested 信号，为此您必须启用 Qt::CustomContextMenu 标志:

  table_1 = QTableView(
      centralwidget,
      selectionBehavior=QAbstractItemView.SelectRows,
      editTriggers=QAbstractItemView.NoEditTriggers,
      contextMenuPolicy=Qt.CustomContextMenu
  )
  table_1.customContextMenuRequested.connect(self.on_customContextMenuRequested)
  

  def on_customContextMenuRequested(self):
      self.contextMenu = QMenu(self)
      deleteAction = QAction("Delete", self)
  
      self.contextMenu.addAction(deleteAction)
      deleteAction.triggered.connect(lambda: self.delete_file())
  
      self.contextMenu.popup(QCursor.pos())
  
  def delete_file(self):
      item = self.get_selected_item_TV1()
      print(f"Deleting: {item}")