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，我设法为主窗口创建了一个上下文菜单，但我希望在选择文件时显示该菜单：如何知道 QFileDialog 中的正确小部件我应该应用 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

我找到了一个可能不是最好的解决方案。它依赖于两个元素：

1. 感谢个人函数objectTree（此处显示但未使用）递归列出QFileDialog 的所有子对象，我确定了正确的小部件，即QTreeView（我理解QTreeView通过尝试依次隐藏所有 QListView 和 QTreeView 小部件是正确的小部件）。因此，我可以通过它的 objectName 和self.findChild(QTreeView, "treeView") 选择它

2. 将setContextMenuPolicy( Qt.ActionsContextMenu ) 应用于此QTreeView。我也尝试实现setContextMenuPolicy(Qt.CustomContextMenu)，它部分工作：我的菜单确实出现了，但在未被激活的原始菜单下！
   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_())