QFileDialog 中的上下文菜单

Question

我想在 QFileDialog 中实现自定义上下文菜单。在下面的代码中，我设法创建主窗口的上下文菜单，但我希望在选择文件时显示菜单：如何知道我应该应用 QFileDialog 中的正确小部件

setContextMenuPolicy

？

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *

class Window(QWidget):

    def __init__(self):

        QWidget.__init__(self)

        self.myFileDialog = QFileDialog()

        self.myFileDialog.setContextMenuPolicy(Qt.CustomContextMenu)
        self.myFileDialog.customContextMenuRequested.connect(self.openMenu)

        layout = QVBoxLayout()
        layout.addWidget(self.myFileDialog)
        self.setLayout(layout)

        self.action_perso = QAction( "MyOwnMenu", self )
        self.connect( self.action_perso, SIGNAL("triggered()"), self.test )

    def openMenu(self, position):
        menu = QMenu()
        menu.addAction(self.action_perso)
        menu.exec_(self.myFileDialog.mapToGlobal(position))

    def test(self):
        print("coucou")


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

Answer 1

我找到了一个解决方案，但这可能不是最好的。它依赖于两个要素：

感谢个人函数
```
objectTree
```
（此处显示但未使用）递归地列出了
```
QFileDialog
```
的所有子对象，我识别了正确的小部件，即
```
QTreeView
```
（我知道QTreeView是正确的小部件）通过尝试连续隐藏所有 QListView 和 QTreeView 小部件）。因此，我可以通过它的 objectName 来选择它
```
self.findChild(QTreeView, "treeView"
```
)
将
```
setContextMenuPolicy( Qt.ActionsContextMenu )
```
应用于此 QTreeView。我还尝试实现一个
```
setContextMenuPolicy(Qt.CustomContextMenu)
```
，并且它部分起作用：我的菜单确实出现了，但在未激活的原始菜单下！
以下是我建议的代码：

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *

class CustomWidget(QFileDialog):
    def __init__(self, parent=None):
        super(CustomWidget,self).__init__(parent)

        # fetch the QTreeView in the QFileDialog
        self.myTree = self.findChild(QTreeView, "treeView")

        # set the context menu policy to ActionsContextMenu
        self.myTree.setContextMenuPolicy( Qt.ActionsContextMenu )

        # Define a new action
        self.action_perso = QAction( "MyOwnMenu", self.myTree )
        self.myTree.addAction( self.action_perso )

        # connect this action to a personnal function
        self.connect( self.action_perso, SIGNAL("triggered()"), self.myFunction )

    def myFunction(self):
        print("coucou")

    def objectTree(self, objet, plan, j):
        """ list recursively all child objects of objet to fetch the right widget """

        n = len( objet.children() )
        for i, child in enumerate( objet.children() ):
            #print("\t"*j, end="")
            plan_sup = plan+"."+str(i)
            #print( plan_sup, child )
            if isinstance(child, QTreeView):
                self.listViews.append(child)
            self.objectTree(child, plan_sup, j+1)  


class MainWidget(QWidget):

    def __init__(self, parent=None):
        super(MainWidget,self).__init__(parent)

        #creation of main layout 
        mainLayout = QVBoxLayout()

        # creation of a widget inside
        self.monWidget = CustomWidget()
        mainLayout.addWidget( self.monWidget )
        self.setLayout( mainLayout )

        self.show()


app = QApplication(sys.argv)
window = MainWidget()
sys.exit(app.exec_())

Answer 2

只是想发布 PyQt5 的原始答案的修改。对我来说主要问题是：

在PyQt5中，显然你需要在
```
self.show()
```
的构造函数中执行
```
CustomWidget(QFileDialog)
```
- 否则它的
```
self.children()
```
仍然是一个空列表，并且原始答案所基于的
```
self.findChild(...)
```
调用都不起作用。
不幸的是（对我来说），这种方法：
我也尝试过实现一个
```
setContextMenuPolicy(Qt.CustomContextMenu)
```
，并且它部分起作用：我的菜单确实出现了，但在未激活的原始菜单下！
...（这是我本来想要的）不再在 PyQt5 中工作：
- 如果您只执行
```
setContextMenuPolicy(Qt.CustomContextMenu)
```
  而不执行其他任何操作（下例中的
```
DO_SIGNALS_CONNECT = False
```
  ），您只会获得原始上下文菜单，没有任何更改（没有添加新操作）
- 如果您执行
```
setContextMenuPolicy(Qt.CustomContextMenu)
```
  并添加信号连接（下例中的
```
DO_SIGNALS_CONNECT = True
```
  ），那么您必须添加处理程序方法（下例中的
```
generate_context_menu_*
```
  ），但在这些方法中，对原始上下文菜单的引用是不可用，所以您所能做的就是在那里创建一个新的
```
QMenu
```
  ，然后添加您在那里的操作。

这意味着，在下面的示例中，无论您使用上下文菜单策略

Qt.ActionsContextMenu

还是

Qt.CustomContextMenu

（使用

DO_SIGNALS_CONNECT = True

），您都会获得完全相同的右键单击上下文菜单响应：

此外，请注意，在此示例中，使用

Qt.CustomContextMenu

策略还将禁用通过键盘 ENTER 或鼠标双击进行的文件夹导航（因此可能需要在

generate_context_menu_*

处理程序方法中完成更多操作，才能将其实现再次工作）。

这是示例：

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QTreeView, QListView, QFileDialog, QAction, QMenu

class CustomWidget(QFileDialog):
    def __init__(self, parent=None):
        super(CustomWidget,self).__init__(parent)

        print("__init__")
        self.objectTree(self, "", 0) # no .children() here - []

        self.show() # must have self.show, so .children() are instantiated; but without extern call to parent .show() afterwards, this on its own does not show the dialog window!
        self.objectTree(self, "", 0) # works here
        print(f"{len(self.children())=}") # 25

        # fetch the QTreeView in the QFileDialog
        self.myTree = self.findChild(QTreeView, "treeView") # when QFileDialog in Detail view
        self.myList = self.findChild(QListView, "listView") # when QFileDialog in List view

        # Define a new action
        self.action_perso_t = QAction( "MyOwnMenu T", self.myTree )
        self.myTree.addAction( self.action_perso_t ) # only works for Qt.ActionsContextMenu
        self.action_perso_l = QAction( "MyOwnMenu L", self.myList )
        self.myList.addAction( self.action_perso_l ) # only works for Qt.ActionsContextMenu

        # connect this action to a personnal function
        self.action_perso_t.triggered.connect(lambda: self.myFunction("MyOwnMenu T"))
        self.action_perso_l.triggered.connect(lambda: self.myFunction("MyOwnMenu L"))

        # CHOOSE HERE: set the context menu policy to ActionsContextMenu
        ctxMenuPolicyChoice = Qt.ActionsContextMenu # Qt.ActionsContextMenu or Qt.CustomContextMenu

        if ctxMenuPolicyChoice == Qt.ActionsContextMenu:
          # ActionsContextMenu fully replaces the original context menu; see also https://stackoverflow.com/q/43890097
          #
          self.myTree.setContextMenuPolicy( Qt.ActionsContextMenu )
          self.myList.setContextMenuPolicy( Qt.ActionsContextMenu )
        #
        elif ctxMenuPolicyChoice == Qt.CustomContextMenu:
          # for CustomContextMenu policy - cannot append action to existing context menu:
          # also, you cannot use double-click or enter to navigate in folders!!
          #
          self.myTree.setContextMenuPolicy( Qt.CustomContextMenu )
          self.myList.setContextMenuPolicy( Qt.CustomContextMenu )
          # CHOOSE HERE:
          DO_SIGNALS_CONNECT = True # True or False
          if DO_SIGNALS_CONNECT:
            self.myTree.disconnect() # must have, see https://stackoverflow.com/q/79192562#comment139645474_79192562
            self.myTree.customContextMenuRequested.connect(self.generate_context_menu_t)
            self.myList.disconnect() # must have, see https://stackoverflow.com/q/79192562#comment139645474_79192562
            self.myList.customContextMenuRequested.connect(self.generate_context_menu_l)

    def generate_context_menu_t(self, location): # https://stackoverflow.com/q/44666427
        print("generate_context_menu t")
        #menu = self.myTree.createStandardContextMenu() # no .createStandardContextMenu for QTreeView or QFileDialog; in qfiledialog.cpp .showContextMenu is private (method of QFileDialogPrivate), and menu = new QMenu(view) is dynamically created there, with no accessible property; renameAction is a propery of QFileDialogPrivate
        menu = QMenu()
        menu.addAction(self.action_perso_t)
        menu.exec(self.mapToGlobal(location)) # https://stackoverflow.com/q/43820152 -> works

    def generate_context_menu_l(self, location): # https://stackoverflow.com/q/44666427
        print("generate_context_menu l")
        menu = QMenu()
        menu.addAction(self.action_perso_l)
        menu.exec(self.mapToGlobal(location))

    def myFunction(self, label):
        print("coucou {}".format(label))

    def objectTree(self, objet, plan, j):
        """ list recursively all child objects of objet to fetch the right widget """
        n = len( objet.children() )
        print(f"objectTree {n=} {objet.children()=}")
        for i, child in enumerate( objet.children() ):
            print("\t"*j, end="")
            plan_sup = plan+"."+str(i)
            print( plan_sup, '"{}"'.format(objet.objectName()), child )
            #if isinstance(child, QTreeView):
            #    self.listViews.append(child) # AttributeError: 'CustomWidget' object has no attribute 'listViews'
            self.objectTree(child, plan_sup, j+1)


class MainWidget(QWidget):

    def __init__(self, parent=None):
        super(MainWidget,self).__init__(parent)

        #creation of main layout
        mainLayout = QVBoxLayout()

        # creation of a widget inside
        self.monWidget = CustomWidget()
        print(f"{self.monWidget.children()=}") # empty if no .show() in CustomWidget() constructor
        mainLayout.addWidget( self.monWidget )
        self.setLayout( mainLayout )

        self.show() # nust have here, even if we now have .show() in CustomWidget() constructor
        print(f"{self.monWidget.children()=}") # fine here (after .show())


app = QApplication(sys.argv)
window = MainWidget()
sys.exit(app.exec_())

QFileDialog 中的上下文菜单

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QFileDialog 中的上下文菜单

问题描述 投票：0回答：2

2个回答

最新问题

问题描述投票：0回答：2