touchbar_demo.py

#!/usr/bin/env python
# touchbar_demo.py
# dsandler@dsandler.org
# PyObjC proof of concept NSTouchBar implementation.
# Note that exceptions in the delegates will crash with "Illegal instruction: 4"
# rather than printing helpful stack traces; look in CrashReporter for the 
# exception string.

import objc
from AppKit import \
        NSObject, NSTouchBar, NSButton, NSCustomTouchBarItem, \
        NSColor, NSApplication, NSApp
from PyObjCTools import AppHelper

NSApplicationDelegate = objc.protocolNamed('NSApplicationDelegate')
NSTouchBarProvider = objc.protocolNamed('NSTouchBarProvider')

class AppDelegate (NSObject, NSTouchBarProvider, NSApplicationDelegate):
    FOO_BUTTON = "fooButton"

    def applicationDidFinishLaunching_(self, aNotification):
        print("Hello, World!")

    def buttonClicked_(self, view):
        print("Clicked: " + repr(view))

    def touchBar_makeItemForIdentifier_(self, bar, ident):
        print("makeItemForIdentifier: " + ident)
        if ident == AppDelegate.FOO_BUTTON:
            item = NSCustomTouchBarItem.alloc().initWithIdentifier_(ident)
            print("made item: " + repr(item))
            button = NSButton.buttonWithTitle_target_action_(
                    "foo", self, "buttonClicked:")
            button.setBezelColor_(
                    NSColor.colorWithRed_green_blue_alpha_(
                        1.0, 0.0, 0.0, 1.0))
            print("made button: " + repr(button))
            item.setCustomizationLabel_(ident)
            item.setView_(button)
            return item

    # NSTouchBarProvider protocol
    def touchBar(self):
        print('touchBar start')
        tb = NSTouchBar.alloc().init()
        print('alloc')
        tb.setDelegate_(self)
        print('setDelegate_')
        #tb.setCustomizationIdentifier_('fooBar')
        tb.setDefaultItemIdentifiers_([AppDelegate.FOO_BUTTON])
        #tb.setCustomizationAllowedItemIdentifiers_(['fooButton'])
        print('touchBar: ' + repr(tb))
        return tb

def main():
    app = NSApplication.sharedApplication()
    app.setAutomaticCustomizeTouchBarMenuItemEnabled_(True)
    delegate = AppDelegate.alloc().init()
    NSApp().setDelegate_(delegate)
    AppHelper.runEventLoop()

if __name__ == '__main__':
    main()

Traceback (most recent call last):
  File "demo.py", line 18, in <module>
    class AppDelegate (NSObject, NSTouchBarProvider, NSApplicationDelegate):
TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

It seems that demo code outdated?