Add Drag and drop import to slicelet?

Development
4

I came across this thread as I was experimenting adding a custom drop action for a custom app using only python. With the code below I was able to redefine the drop action to execute what I put in dropEvent when I dropped a file path instead of the Slicer default of opening the Add Data Dialog.

class MyClass(qt.QWidget):
    def eventFilter(self, object, event):
        """
        Custom event filter for Slicer Main Window.

        Inputs: Object (QObject), Event (QEvent)
        """
        if event.type() == qt.QEvent.DragEnter:
            self.dragEnterEvent(event)
            return True
        if event.type() == qt.QEvent.Drop:
            self.dropEvent(event)
            return True
        return False
    def dragEnterEvent(self, event):
        """
        Actions to do when a drag enter event occurs in the Main Window.

        Read up on https://doc.qt.io/qt-5.12/dnd.html#dropping
        Input: Event (QEvent)
        """
        if event.mimeData().hasUrls:
            event.acceptProposedAction()  # allows drop event to proceed
        else:
            event.ignore()
    def dropEvent(self, event):
        """
        Actions to do when an item is dropped onto the Main Window.

        Read up on https://doc.qt.io/qt-5.12/dnd.html#dropping
        Input: Event (QEvent)
        """
        print("Custom drop code goes here")

my_class = MyClass()
slicer.util.mainWindow().installEventFilter(my_class)
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