Drag and Drop adding the QUrl as well as the file path in QLineEdit

AddyMills

Hello all,

I'm just getting into the world of Qt and I've run into an odd situation that I can't seem to solve. I've created a GUI with a QLineEdit widget and enabled drag and drop in order to grab the file path, and while it works to drop in a file, there is extra data that gets added. Say I drag a file C:/real.pak.xen into my program. The QLineEdit field then shows C:/real.pak.xenfile:///C:/real.pak.xen.

The "file:///C:/real.pak.xen" is what's stored in the QUrl of the file and is unwanted. It shows up where I released my mouse button. If I were to drag and drop this same file closer to the left of the input box, it displays "C:/reafile:///C:/real.pak.xenl.pak.xen" instead.

This is my code snippet to initialize the field:

self.pak_input_field = QLineEdit(self)
self.pak_input_field.setPlaceholderText('Drag and drop PAK file or click to browse...')
self.pak_input_field.setAcceptDrops(True)
self.pak_input_field.installEventFilter(self)
layout.addWidget(self.pak_input_field)

Because I want the user to be able to drag and drop files as well as browse for them, this is my event filter:

    def eventFilter(self, obj, event):
        if obj == self.pak_input_field and event.type() == QEvent.DragEnter:
            if event.mimeData().hasUrls():
                event.acceptProposedAction()
            else:
                event.ignore()
        elif obj == self.pak_input_field and event.type() == QEvent.Drop:
            file_path = event.mimeData().urls()[0].toLocalFile()
            self.set_input_filepath(file_path)
            event.acceptProposedAction()
        elif obj == self.pak_input_field and event.type() == QEvent.MouseButtonPress:
            options = QFileDialog.Options()
            filename, _ = QFileDialog.getOpenFileName(self, "Open PAK File", "",
                                                      "PAK Files (*.pak *.pak.xen *.pak.ps3)", options=options)
            if filename:
                self.set_input_filepath(filename)
        return super().eventFilter(obj, event)

I figure the QEvent.Drop portion has a fault somewhere, but I can't figure out what. Clearing the field before setting the text in the field doesn't work either.

Does anyone have any ideas what could be happening?

friedemannkleint

Dnd may have additional info depending on the source. The drop site example can be used to display it https://doc.qt.io/qtforpython-6/examples/example_widgets_draganddrop_dropsite.html .

AddyMills

@friedemannkleint Yes! Thank you!

That allowed me to see that it was the "text/uri-list" data it was inserting. I ended up re-defining the Drop function for the QLineEdit class and that seemed to have done the trick!

class FileDropLineEdit(QLineEdit):
    def __init__(self, parent=None):
        super().__init__(parent)

    def dropEvent(self, event):
        if event.mimeData().hasUrls():
            file_path = event.mimeData().urls()[0].toLocalFile()
            file_path = file_path.replace("/", "\\")
            self.setText(file_path)
            event.acceptProposedAction()
        else:
            event.ignore()

Since it's now its own class, I also removed the reference to the Drop event in my event filter and referenced it when creating the initial window.