Source Code for Module appModules.logonui

 1  #appModules/logonui.py 
 2  #A part of NonVisual Desktop Access (NVDA) 
 3  #This file is covered by the GNU General Public License. 
 4  #See the file COPYING for more details. 
 5  #Copyright (C) 2009-2011 James Teh <jamie@jantrid.net>, Michael Curran <mick@kulgan.net> 
 6   
 7  import speech 
 8  import api 
 9  import braille 
10  import controlTypes 
11  from NVDAObjects.IAccessible import IAccessible 
12  from NVDAObjects.behaviors import Dialog 
13  import appModuleHandler 
14  import eventHandler 
15   
16  """App module for the Windows Logon screen 
17  """ 
18   
19 -class LogonDialog(Dialog): 
20   
21          role = controlTypes.ROLE_DIALOG 
22          isPresentableFocusAncestor = True 
23   
24 -        def event_gainFocus(self): 
25                  child = self.firstChild 
26                  if child and controlTypes.STATE_FOCUSED in child.states and not eventHandler.isPendingEvents("gainFocus"): 
27                          # UIA reports that focus is on the top level pane, even when it's actually on the frame below. 
28                          # This causes us to incorrectly use UIA for the top level pane, which causes this pane to be spoken again when the focus moves. 
29                          # Therefore, bounce the focus to the correct object. 
30                          eventHandler.queueEvent("gainFocus", child) 
31                          return 
32   
33                  return super(LogonDialog, self).event_gainFocus() 
34   
35 -class XPPasswordField(IAccessible): 
36   
37 -        def initOverlayClass(self): 
38                  for gesture in ("kb:upArrow", "kb:downArrow"): 
39                          self.bindGesture(gesture, "changeUser") 
40   
41 -        def _get_name(self): 
42                  # Focus automatically jumps to the password field when a user is selected. This field has no name. 
43                  # This means that the new selected user is not reported. 
44                  # However, the selected user name is the name of the window object for this field. 
45                  try: 
46                          self.parent.invalidateCache() 
47                          return self.parent.name 
48                  except: 
49                          return super(XPPasswordField, self).name 
50   
51 -        def script_changeUser(self, gesture): 
52                  # The up and down arrow keys change the selected user, but there's no reliable NVDA event for detecting this. 
53                  oldName = self.name 
54                  gesture.send() 
55                  self.invalidateCache() 
56                  if oldName == self.name or controlTypes.STATE_FOCUSED not in self.states: 
57                          return 
58                  self.event_gainFocus() 
59   
60 -class AppModule(appModuleHandler.AppModule): 
61   
62 -        def event_NVDAObject_init(self, obj): 
63                  if obj.windowClassName == "NativeHWNDHost" and obj.parent and not obj.parent.parent: 
64                          # This is the top level pane of the XP logon screen. 
65                          # Make sure it is always presented. 
66                          obj.isPresentableFocusAncestor = True 
67   
68 -        def chooseNVDAObjectOverlayClasses(self, obj, clsList): 
69                  windowClass = obj.windowClassName 
70   
71                  if windowClass == "AUTHUI.DLL: LogonUI Logon Window" and obj.parent and obj.parent.parent and not obj.parent.parent.parent: 
72                          clsList.insert(0, LogonDialog) 
73                          return 
74   
75                  if windowClass == "Edit" and not obj.name: 
76                          parent = obj.parent 
77                          if parent and parent.role == controlTypes.ROLE_WINDOW: 
78                                  clsList.insert(0, XPPasswordField) 
79                                  return 
80   
81 -        def event_gainFocus(self,obj,nextHandler): 
82                  if obj.windowClassName=="DirectUIHWND" and obj.role==controlTypes.ROLE_BUTTON and not obj.next: 
83                          prev=obj.previous 
84                          if prev and prev.role==controlTypes.ROLE_STATICTEXT: 
85                                  # This is for a popup message in the logon dialog. 
86                                  # Present the dialog again so the message will be reported. 
87                                  speech.speakObjectProperties(api.getForegroundObject(),name=True,role=True,description=True) 
88                                  braille.invalidateCachedFocusAncestors(1) 
89                  nextHandler() 
90