selection observer

timotimo

Is there a way to observe for changes in selection of points and components?
Tools have a selection object, but how to access it outside a tool?

timotimo

But then I have to handle all the glyph changes somehow, like this:

from mojo.events import addObserver, removeObserver, postEvent


class DummyController(object):
    
    def __init__(self):
        self.glyph = CurrentGlyph()
        addObserver(self, "currentGlyphChanged", "currentGlyphChanged")
        self.addSelectionObserver()
    
    def currentGlyphChanged(self, notification):
        self.removeSelectionObserver()
        self.glyph = notification["glyph"]
        self.addSelectionObserver()
        postEvent("selectionChanged")
    
    def glyphSelectionChanged(self, notification):
        postEvent("selectionChanged")
    
    def addSelectionObserver(self):
        if self.glyph is not None:
            self.glyph.addObserver(self, "glyphSelectionChanged", "Glyph.SelectionChanged")
    
    def removeSelectionObserver(self):
        if self.glyph is not None:
            self.glyph.removeObserver(self, "Glyph.SelectionChanged")

    
class DummyObserver():
    
    def __init__(self):
        addObserver(self, "selectionChanged", "selectionChanged")
    
    def selectionChanged(self, notification):
        self.glyph = notification["glyph"]
        if self.glyph is not None:
            print(self.glyph.selectedPoints, self.glyph.selectedComponents)


DummyController()
DummyObserver()

I was thinking there might be something like this already built in.

frederik

there is a way to observe selection changes:


class DummyController(object):
    
    def __init__(self):
        self.glyph = CurrentGlyph()
        self.glyph.addObserver(self, "myCallback", "Glyph.SelectionChanged")
        print("done")
    
    def myCallback(self, notification):
        print("Selection Changed")
        
    
DummyController()

don’t forget the removeObserver when you are done...

SOLVED selection observer