MaintainGlyphZoom.py

from mojo.events import addObserver
from AppKit import NSRect

# RF Version Check
from mojo.roboFont import version
RF3 = version[0] > "1"

class MaintainZoom(object):
    
    """
    Startup Script:
        Maintain the same zoom settings when switching between layers and glyphs
        -- Andy Clymer, github.com/andyclymer
    """

    def __init__(self):

        # Save zoom posSize and offset for each open font
        # font object as key, dict of "rectPos", "rectSize", "offset" and "glyph" as value
        self.prevZoom = {}
        
        addObserver(self, "getZoom", "viewWillChangeGlyph")
        addObserver(self, "setZoom", "viewDidChangeGlyph")

    def getZoom(self, info):
        view = info["view"]
        glyph = info["glyph"]
        if not None in [view, glyph]:
            font = glyph.getParent()
            # Get the zoom rect and offset for the view
            rect = view.visibleRect()
            offset = view._offset
            posSizeOffset = dict(
                rectPos = (rect.origin.x, rect.origin.y),
                rectSize = (rect.size.width, rect.size.height), 
                offset = (offset.x, offset.y),
                glyph = glyph)
            # Save the zoom info
            self.prevZoom[font] = posSizeOffset

    def setZoom(self, info):
        view = info["view"]
        glyph = info["glyph"]
        if not None in [view, glyph]:
            font = glyph.getParent()
            # Set the zoom info, if this is a new glyph or layer
            if font in self.prevZoom:
                posSizeOffset = self.prevZoom[font]
                if not posSizeOffset["glyph"]== glyph:
                    offset = view._offset
                    newRect = NSRect()
                    newRect.origin.x, newRect.origin.y = posSizeOffset["rectPos"]
                    newRect.size.width, newRect.size.height = posSizeOffset["rectSize"]
                    view.zoomViewToRect_(newRect)
                    view._offset.x, view._offset.y = posSizeOffset["offset"]
            else:
                # Zoom to 100% if nothing has been saved for this font
                view.zoomViewToAbsoluteScale_(1)

if RF3:
    MaintainZoom()