If you want your item to be droppable onto a difference/resample object, return true here and return a valid video handler.

Get a string with all values of the QPen

The inverse functio to get a QPen from the string

Remove the selected items from the playlist tree widget and delete them

code for checking if a point is inside a polygon. adapted from https://stackoverflow.com/questions/217578/how-can-i-determine-whether-a-2d-point-is-wi

Return the index of a certain size (0 (Custom Size) if not found)