Tracking Undo/Redo-History for the custom attributes

[RafaŁ Buchner]

Hey Guys,
I have a class, with a list as a custom attribute:

from mojo.events import EditingTool, installTool

class MyTool(EditingTool):
    def __init__(self):
        super().__init__()
        self.specialPoints = [] # My Custom Attribute

This attribute will contain set of points that should be selected by a user.
At some point this class adds selected points to this list

def additionContextualMenuItems(self):
    return [("Create Special Point", self.createSpecialPoint)]

def createSpecialPoint(self, sender):
    g = CurrentGlyph()
    for p in g.selection:
        self.specialPoints.append(p)

Is there any way to track this action, so If the user will use Undo/Redo, the points will be deleted form the list or re-added to the list in the right order? Also this Undo/Redo should still track other actions of course.

I think I should use didUndo(), but how?

I was thinking of tracking changes by adding the labels, but changes in the labels are not tracked by history related events.

Thanks in advance for the help!

[frederik]

the font.lib is also possible but then its hard to have the global undo manager focus. The current undo manager is connected to the current glyph.

good luck!

[frederik]

store your data in the glyph.lib if you want undo powers

[RafaŁ Buchner]

a new version of Undo looks really nice. Unfortunately, It doesn't work in my case.
This action is not connected with a glyph or a font, so I cannot track it with prepare/performUndo.
I will maybe try to use a font.lib dictionary, although I don't know if it can be tracked. I will keep you posted if it worked

[frederik]

you have to wrap your actions inside:

glyph.prepareUndo("Moved By 100, 100")
glyph.moveBy((100, 100)
glyph.performUndo()

see RGlyph.performUndo

in the next release (RF3.2) you can use:

with glyph.Undo("Moved By 100, 100")
    glyph.moveBy((100, 100)