generate middle click events (backport from HEAD of the patch 1521314)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43585 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/wx/lib/mixins/inspect.py

@@ -0,0 +1,58 @@
+#----------------------------------------------------------------------------
+# Name:        wx.lib.mixins.inspect
+# Purpose:     A mix-in class that can add PyCrust-based inspection of the app
+#
+# Author:      Robin Dunn
+#
+# Created:     21-Nov-2006
+# RCS-ID:      $Id$
+# Copyright:   (c) 2006 by Total Control Software
+# Licence:     wxWindows license
+#----------------------------------------------------------------------------
+
+# NOTE: This class is based on ideas sent to the wxPython-users
+# mail-list by Dan Elof.
+
+import wx.py
+
+class InspectionMixin(object):
+    """
+    This class is intended to be used as a mix-in with the wx.App
+    object.  When used it will add the ability to popup a PyCrust
+    window where the widget under the mouse cursor will be loaded into
+    the shell's namespace as 'win'.
+
+    To use this class simply derive a class from wx.App and
+    InspectionMixin and then call the Init() method from the app's
+    OnInit.
+    """    
+    def Init(self):
+        """
+        Make the event binding that will activate the PyCrust window.
+        """
+        self.Bind(wx.EVT_KEY_DOWN, self.OnKeyPress)
+        self._crust = None
+
+
+    def OnKeyPress(self, evt):
+        """
+        Event handler
+        """
+        if evt.AltDown() and evt.CmdDown() and evt.KeyCode == ord('I'):
+            self.ShowShell()
+        else:
+            evt.Skip()
+
+
+    def ShowShell(self):
+        """
+        Show the PyCrust window.
+        """
+        if not self._crust:
+            self._crust = wx.py.crust.CrustFrame(self.GetTopWindow())
+            self._crust.shell.interp.locals['app'] = self
+        win = wx.FindWindowAtPointer()
+        self._crust.shell.interp.locals['win'] = win
+        self._crust.Show()
+
+