NSFontManager

Here is a minimal demonstration of an application that uses the FontPanel.
The application window contains a Custom View object (class set to MyView). The main menu contains a Font Menu Item (NSMenuItem), and there is a object called Font Manager (NSFontManager). The only connection that is needed is to make the Font Manager a target of the Show Fonts Menu Item, such that it receives the action "orderFrontFontPanel."

Now, when the User clicks on Font => Show Fonts, the Font Manager handles the interaction, and if the font changes, it calls "changeFont_" which is sent to the First Responder. To deal with a request to change the font, all we need is something like this:

class MyView(NSView): def initWithFrame_(self, frame): self = super(MyView, self).initWithFrame_(frame) self.font = NSFont.fontWithName_size_( 'Helvetica', NSNumber.numberWithInt_(14)) return self def acceptsFirstResponder(self): return True def changeFont_(self,sender): print 'changeFont_', sender font = sender.convertFont_(self.font) print font.description() self.font = font self.setNeedsDisplay_(True) def drawRect_(self, rect): NSColor.whiteColor().set() NSBezierPath.fillRect_(self.bounds()) D = { NSFontAttributeName: self.font } g = 'just a purple string' c = NSColor.purpleColor() D[NSForegroundColorAttributeName] = c s = NSString.stringWithString_(g) s.drawAtPoint_withAttributes_(NSPoint(20,20), D)

I think what it does is so obvious that we don't need a screenshot. Of course, we could make things a lot more complicated. At the moment, none of the other items in the Font Menu is active.