Install event filter for drop event on the main window

[johan Borgström]

Hi,

I am trying to install an event filter on the main maya window to process a drop event. In the snippet below I can get the key press event, but the DragEnter and Drop event never gets called. Instead a function called "performFileDropAction" gets called.

How would I do this?

Thanks,

/ J

from PySide2 import QtGui, QtCore, QtWidgets

from maya import OpenMayaUI as omui

from shiboken2 import wrapInstance

class MyEventFilter(QtCore.QObject):

    

    def eventFilter(self, obj, event):

                     

        if event.type() is event.KeyPress:

            print("Ate key press", event.key())

            event.accept()

            return True

            

        elif event.type() is event.DragEnter:

            print('DragEnter')

            event.accept()

                 

        elif event.type() is event.Drop:

            print('Drop')

            event.accept()

        

        else:

            # standard event processing

            return QtCore.QObject.eventFilter(self, obj, event)

                               

main_win = wrapInstance(long(omui.MQtUtil.mainWindow()), QtWidgets.QWidget) 

my_filter = MyEventFilter()

main_win.installEventFilter(my_filter)

#main_win.removeEventFilter(my_filter)

[johan Borgström]

I am using Maya 2017.

/J

[Justin Israel]

If you search the forum you will see previous questions about adding a drag and drop handler to Maya. 

https://groups.google.com/d/topic/python_inside_maya/Auiy06xVqLo/discussion

This one in particular shows an approach that works in 2015 for sure, but possibly not anymore in 2017 under PySide2. But it may be because of changes to Maya and which widgets are handling events. If in the past, the viewport never directly handled the drops, then it would make sense to be able to catch them on the main window. But if Maya has changed to where the event is handled on the viewport or some child widget of the main window, then you won't be able to catch it from the main window. It would have to be installed on the viewport widget. 

Events work by first going through the QApplication, and then getting sent directly to the target widget for the event. If the target widget decides not to handle it, then it bubbles up to parents, which is why you can catch things on the main window like a viewport drag and drop I'm Maya 2015

Here is the qt 4.8 reference about how the event system works:

http://doc.qt.io/qt-4.8/eventsandfilters.html

Justin 

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[johan Borgström]

Thanks for your answer Justin,

I tried to install the event filter directly on the perspective view panel using snippet below. Got the same result, key press events captured but not the drop. I guess that means that the event is processed "higher up"

I will continue to look for a solution, but if anyone have any ideas that would be great!

Best,

Johan

ptr = MQtUtil.findControl('modelPanel4')

model_panel_4 = wrapInstance(long(ptr), QtWidgets.QWidget)

my_filter = MyEventFilter()

model_panel_4.installEventFilter(my_filter)

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[Justin Israel]

On Sat, Feb 4, 2017, 12:50 PM johan Borgström <jo...@petfactory.se> wrote:

Thanks for your answer Justin,

I tried to install the event filter directly on the perspective view panel using snippet below. Got the same result, key press events captured but not the drop. I guess that means that the event is processed "higher up"

It could be higher up or lower down because whatever widget or filter receiving the drop is handling it and not bubbling it up 

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