PyQt4 - Dragging and dropping files into QPushButt

Question

I think the title is fairly self explanatory. I'm working to create a small standalone app that requires the user to drag and drop audio files onto buttons to in turn associate the file with a corresponding button on a piece of hardware by using the filepath, etc...

I've followed a ton of drag and drop tutorials for widgets, and my friend has for lists, however I'm beginning to believe that it can't be done for a button? I'm aware that you can drag and drop text onto a button. I am not fully up to speed with Qt yet so there may just be a glaring error that I'm missing.

Here is the code, many thanks!

import sys
from PyQt4 import QtGui, QtCore

class Button(QtGui.QPushButton):
    def __init__(self, parent):
    super(Button, self).__init__(parent)
    self.setAcceptDrops(True)
    self.setDragDropMode(QAbstractItemView.InternalMove)

def dragEnterEvent(self, event):
    if event.mimeData().hasUrls():
        event.acceptProposedAction()
    else:
        super(Button, self).dragEnterEvent(event)

def dragMoveEvent(self, event):
    super(Button, self).dragMoveEvent(event)

def dropEvent(self, event):
    if event.mimeData().hasUrls():
        for url in event.mimeData().urls():
            path = self.addItem(url.path())
            print path
        event.acceptProposedAction()
    else:
        super(Button,self).dropEvent(event)

class MyWindow(QtGui.QWidget):
    def __init__(self):
        super(MyWindow,self).__init__()
        self.setGeometry(100,100,300,400)
        self.setWindowTitle("Filenames")

        self.btn = QtGui.QPushButton()
        self.btn.setGeometry(QtCore.QRect(90, 90, 61, 51))
        self.btn.setText("Change Me!")
        layout = QtGui.QVBoxLayout(self)
        layout.addWidget(self.btn)

        self.setLayout(layout)

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    window = MyWindow()
    window.show()
    sys.exit(app.exec_())

Answer 1

There are three problems with your posted code, the main being that you aren't even using the custom Button class that you made. You are adding just a regular button to your window with:

self.btn = QtGui.QPushButton()

instead of:

self.btn = Button(self)

Also, QPushButtons don't have a setDragDropMode() method, so you'll need to comment that line out. I'm not sure what it does anyway.

Also, QPushButton doesn't have an addItem() method so I'm not sure what that's about unless you were planning on implementing it. I replaced it below with just printing the file path.

Here is a working version of your code, that just prints the file path of any file dragged into the button:

import sys
from PyQt4 import QtGui, QtCore

class Button(QtGui.QPushButton):
    def __init__(self, parent):
        super(Button, self).__init__(parent)
        self.setAcceptDrops(True)
        #self.setDragDropMode(QAbstractItemView.InternalMove)

    def dragEnterEvent(self, event):
        if event.mimeData().hasUrls():
            event.acceptProposedAction()
        else:
            super(Button, self).dragEnterEvent(event)

    def dragMoveEvent(self, event):
        super(Button, self).dragMoveEvent(event)

    def dropEvent(self, event):
        if event.mimeData().hasUrls():
            for url in event.mimeData().urls():
                print str(url.toLocalFile())
            event.acceptProposedAction()
        else:
            super(Button,self).dropEvent(event)

class MyWindow(QtGui.QWidget):
    def __init__(self):
        super(MyWindow,self).__init__()
        self.setGeometry(100,100,300,400)
        self.setWindowTitle("Filenames")

        self.btn = Button(self)
        self.btn.setGeometry(QtCore.QRect(90, 90, 61, 51))
        self.btn.setText("Change Me!")
        layout = QtGui.QVBoxLayout(self)
        layout.addWidget(self.btn)

        self.setLayout(layout)

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    window = MyWindow()
    window.show()
    sys.exit(app.exec_())