Fix Mac wxpython example exiting with error code 255 (#162)...

Add comment about tkinter_.py example not working on Mac.

Delete deprecated Mac examples.

examples/tkinter_.py

@@ -1,9 +1,12 @@
 # Example of embedding CEF Python browser using Tkinter toolkit.
 # This example has two widgets: a navigation bar and a browser.
 #
+# NOTE: This example doesn't work on Mac, details in Issue #306.
+#
 # Tested configurations:
-# - Tk 8.6 and CEF Python v55.3+ on Linux
-# - Tk 8.5 and CEF Python v55.4+ on Windows
+# - Tk 8.5 on Windows
+# - Tk 8.6 on Linux
+# - CEF Python v55.3+
 #
 # Known issue on Linux: When typing url, mouse must be over url
 # entry widget otherwise keyboard focus is lost (Issue #255
@@ -41,7 +44,7 @@ def main():
     logger.addHandler(stream_handler)
     logger.info("CEF Python {ver}".format(ver=cef.__version__))
     logger.info("Python {ver}".format(ver=sys.version[:6]))
-    logger.info("Tk {ver}".format(ver=tk.TkVersion))
+    logger.info("Tk {ver}".format(ver=tk.Tcl().eval('info patchlevel')))
     assert cef.__version__ >= "55.3", "CEF Python v55.3+ required to run this"
     sys.excepthook = cef.ExceptHook  # To shutdown all CEF processes on error
     cef.Initialize()

examples/wxpython.py

@@ -144,7 +144,10 @@ def OnClose(self, event):
             g_count_windows -= 1
             if g_count_windows == 0:
                 cef.Shutdown()
-                wx.GetApp().Exit()
+                wx.GetApp().ExitMainLoop()
+                # Call _exit otherwise app exits with code 255 (Issue #162).
+                # noinspection PyProtectedMember
+                os._exit(0)
         else:
             # Calling browser.CloseBrowser() and/or self.Destroy()
             # in OnClose may cause app crash on some paltforms in
@@ -160,7 +163,6 @@ def clear_browser_references(self):
 
 
 class FocusHandler(object):
-
     def OnGotFocus(self, browser, **_):
         # Temporary fix for focus issues on Linux (Issue #284).
         if LINUX: