QFileDialog.getOpenFileName 将按钮文本从“打开”更改为“删除”

Question

I am using QFileDialog.getOpenFileName(self,'Remove File', "path", '*.pdf') to select a file and get the path in order to remove it from my application. The issue is the QFileDialog.getOpenFileName window button says 'Open' when selecting a file which will be confusing to the user.

Is there any way to change the button text from 'Open' to 'Remove'/'Delete'

Answer 1

When using the static method QFileDialog::getOpenFileName() the first thing is to obtain the QFileDialog object and for that we use a QTimer and the findChild() method:

    # ...
    QtCore.QTimer.singleShot(0, self.on_timeout)
    filename, _ = QtWidgets.QFileDialog.getOpenFileName(...,
        options=QtWidgets.QFileDialog.DontUseNativeDialog)

def on_timeout(self):
    dialog = self.findChild(QtWidgets.QFileDialog)
    # ...

Then you can get the text iterating over the buttons until you get the button with the searched text and change it:

for btn in dialog.findChildren(QtWidgets.QPushButton):
    if btn.text() == "&Open":
        btn.setText("Remove")

That will work at the beginning but every time you interact with the QTreeView they show, update the text to the default value, so the same logic will have to be applied using the currentChanged signal from the selectionModel() of the QTreeView but for synchronization reasons it is necessary Update the text later using another QTimer.singleShot() , the following code is a workable example:

import sys

from PyQt5 import QtCore, QtWidgets


class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        button = QtWidgets.QPushButton("Press me")
        button.clicked.connect(self.on_clicked)

        lay = QtWidgets.QVBoxLayout(self)
        lay.addWidget(button)

    @QtCore.pyqtSlot()
    def on_clicked(self):
        QtCore.QTimer.singleShot(0, self.on_timeout)
        filename, _ = QtWidgets.QFileDialog.getOpenFileName(
            self,
            "Remove File",
            "path",
            "*.pdf",
            options=QtWidgets.QFileDialog.DontUseNativeDialog,
        )

    def on_timeout(self):
        dialog = self.findChild(QtWidgets.QFileDialog)
        dialog.findChild(QtWidgets.QTreeView).selectionModel().currentChanged.connect(
            lambda: self.change_button_name(dialog)
        )
        self.change_button_name(dialog)

    def change_button_name(self, dialog):
        for btn in dialog.findChildren(QtWidgets.QPushButton):
            if btn.text() == self.tr("&Open"):
                QtCore.QTimer.singleShot(0, lambda btn=btn: btn.setText("Remove"))


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)

    w = Widget()
    w.show()

    sys.exit(app.exec_())

The first step can be avoided if the static method is not used and create the dialog using an instance of QFileDialog :

import sys

from PyQt5 import QtCore, QtWidgets


class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        button = QtWidgets.QPushButton("Press me")
        button.clicked.connect(self.on_clicked)

        lay = QtWidgets.QVBoxLayout(self)
        lay.addWidget(button)

    @QtCore.pyqtSlot()
    def on_clicked(self):
        dialog = QtWidgets.QFileDialog(
            self,
            "Remove File",
            "path",
            "*.pdf",
            supportedSchemes=["file"],
            options=QtWidgets.QFileDialog.DontUseNativeDialog,
        )
        self.change_button_name(dialog)
        dialog.findChild(QtWidgets.QTreeView).selectionModel().currentChanged.connect(
            lambda: self.change_button_name(dialog)
        )
        if dialog.exec_() == QtWidgets.QDialog.Accepted:
            filename = dialog.selectedUrls()[0]
            print(filename)

    def change_button_name(self, dialog):
        for btn in dialog.findChildren(QtWidgets.QPushButton):
            if btn.text() == self.tr("&Open"):
                QtCore.QTimer.singleShot(0, lambda btn=btn: btn.setText("Remove"))


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)

    w = Widget()
    w.show()

    sys.exit(app.exec_())

Answer 2

While I appreciate the solution provided by @eyllanesc , I'd like to propose a variation.

Under certain circumstances, the code for that answer might fail, specifically:

• the delay that X11 suffers from mapping windows;
• the checking of localized button strings;
• the selection using the file name edit box;

Considering the above, I propose an alternate solution, based on the points above.

For obvious reasons, the main point remains: the dialog must be non-native.

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

class FileDialogTest(QWidget):
    def __init__(self):
        super().__init__()
        layout = QHBoxLayout(self)

        self.fileEdit = QLineEdit()
        layout.addWidget(self.fileEdit)

        self.selectBtn = QToolButton(icon=QIcon.fromTheme('folder'),  text='…')
        layout.addWidget(self.selectBtn)

        self.selectBtn.clicked.connect(self.showSelectDialog)

    def checkSelectDialog(self):
        dialog = self.findChild(QFileDialog)
        if not dialog.isVisible():
            # wait for dialog finalization, as testOption might fail
            return

        # dialog found, stop the timer and delete it
        self.sender().stop()
        self.sender().deleteLater()

        if not dialog.testOption(dialog.DontUseNativeDialog):
            # native dialog, we cannot do anything!
            return
        
        def updateOpenButton():
            selection = tree.selectionModel().selectedIndexes()
            if selection and not tree.model().isDir(selection[0]):
                # it's a file, change the button text
                button.setText('Select my precious file')

        tree = dialog.findChild(QTreeView)
        button = dialog.findChild(QDialogButtonBox).button(
            QDialogButtonBox.Open)

        # check for selected files on open
        updateOpenButton()

        # connect the selection update signal
        tree.selectionModel().selectionChanged.connect(
            lambda: QTimer.singleShot(0, updateOpenButton))

    def showSelectDialog(self):
        QTimer(self, interval=10, timeout=self.checkSelectDialog).start()
        path, filter = QFileDialog.getOpenFileName(self, 
            'Select file', '<path_to_file>', 
            "All Files (*);;Python Files (*.py);; PNG Files (*.png)", 
            options=QFileDialog.DontUseNativeDialog)
        if path:
            self.fileEdit.setText(path)


if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    ex = FileDialogTest()
    ex.show()
    sys.exit(app.exec())

Obviously, for PyQt6 you'll need to use the proper Enum namespaces (ie QFileDialog.Option.DontUseNativeDialog , etc.).