Source Code for Module NVDAObjects.window.akelEdit

  1  #A part of NonVisual Desktop Access (NVDA) 
  2  #Copyright (C) 2006-2008 NVDA Contributors <http://www.nvda-project.org/> 
  3  #This file is covered by the GNU General Public License. 
  4  #See the file COPYING for more details. 
  5   
  6  import edit 
  7  import winUser 
  8  import winKernel 
  9  import ctypes 
 10  import watchdog 
 11   
 12  # Messages 
 13  AEM_GETINDEX          =(winUser.WM_USER + 2106) 
 14  AEM_CHARFROMPOS       =(winUser.WM_USER + 2151) 
 15  AEM_POSFROMCHAR       =(winUser.WM_USER + 2152) 
 16  AEM_INDEXTORICHOFFSET =(winUser.WM_USER + 2112) 
 17  AEM_RICHOFFSETTOINDEX =(winUser.WM_USER + 2113) 
 18  AEM_CONTROLVERSION        =(winUser.WM_USER + 2200) 
 19   
 20  #AEM_GETINDEX flags 
 21  AEGI_LASTCHAR         =2 
 22  AEGI_CARETCHAR             =5 
 23  AEGI_NEXTLINE              =24 
 24   
 25   
 26  #Structures 
 27   
 28 -class AELINEDATA(ctypes.Structure): 
 29          pass 
 30   
 31  AELINEDATA._fields_=[ 
 32          ('next',ctypes.POINTER(AELINEDATA)), 
 33          ('prev',ctypes.POINTER(AELINEDATA)), 
 34          ('wpLine',ctypes.c_wchar), 
 35          ('nLineLen',ctypes.c_int), 
 36          ('nLineBreak',ctypes.c_int), 
 37          ('nLineWidth',ctypes.c_int), 
 38          ('nSelStart',ctypes.c_int), 
 39          ('nSelEnd',ctypes.c_int), 
 40  ] 
 41   
 42 -class AECHARINDEX(ctypes.Structure): 
 43          _fields_=[ 
 44                  ('nLine',ctypes.c_int), 
 45                  ('lpLine',AELINEDATA), 
 46                  ('nCharInLine',ctypes.c_int), 
 47          ] 
 48   
 49   
 50 -class AkelEditTextInfo(edit.EditTextInfo): 
 51   
 52 -        def _getLineNumFromOffset(self,offset): 
 53                  ciChar=AECHARINDEX() 
 54                  processHandle=self.obj.processHandle 
 55                  internalCiChar=winKernel.virtualAllocEx(processHandle,None,ctypes.sizeof(ciChar),winKernel.MEM_COMMIT,winKernel.PAGE_READWRITE) 
 56                  try: 
 57                          watchdog.cancellableSendMessage(self.obj.windowHandle,AEM_RICHOFFSETTOINDEX,offset,internalCiChar) 
 58                          winKernel.readProcessMemory(processHandle,internalCiChar,ctypes.byref(ciChar),ctypes.sizeof(ciChar),None) 
 59                  finally: 
 60                          winKernel.virtualFreeEx(processHandle,internalCiChar,0,winKernel.MEM_RELEASE) 
 61                  return ciChar.nLine 
 62   
 63 -        def _getStoryLength(self): 
 64                  ciChar=AECHARINDEX() 
 65                  processHandle=self.obj.processHandle 
 66                  internalCiChar=winKernel.virtualAllocEx(processHandle,None,ctypes.sizeof(ciChar),winKernel.MEM_COMMIT,winKernel.PAGE_READWRITE) 
 67                  try: 
 68                          watchdog.cancellableSendMessage(self.obj.windowHandle,AEM_GETINDEX,AEGI_LASTCHAR,internalCiChar) 
 69                          end=watchdog.cancellableSendMessage(self.obj.windowHandle,AEM_INDEXTORICHOFFSET,0,internalCiChar) 
 70                  finally: 
 71                          winKernel.virtualFreeEx(processHandle,internalCiChar,0,winKernel.MEM_RELEASE) 
 72                  return end+1 
 73   
 74 -        def _getLineOffsets(self,offset): 
 75                  (start,end)=super(AkelEditTextInfo,self)._getLineOffsets(offset) 
 76                  if end == self._getStoryLength(): 
 77                          return (start,end) 
 78                  ciChar=AECHARINDEX() 
 79                  processHandle=self.obj.processHandle 
 80                  internalCiChar=winKernel.virtualAllocEx(processHandle,None,ctypes.sizeof(ciChar),winKernel.MEM_COMMIT,winKernel.PAGE_READWRITE) 
 81                  try: 
 82                          watchdog.cancellableSendMessage(self.obj.windowHandle,AEM_RICHOFFSETTOINDEX,offset,internalCiChar) 
 83                          watchdog.cancellableSendMessage(self.obj.windowHandle,AEM_GETINDEX,AEGI_NEXTLINE,internalCiChar) 
 84                          end=watchdog.cancellableSendMessage(self.obj.windowHandle,AEM_INDEXTORICHOFFSET,0,internalCiChar) 
 85                  finally: 
 86                          winKernel.virtualFreeEx(processHandle,internalCiChar,0,winKernel.MEM_RELEASE) 
 87                  return (start,end) 
 88   
 89   
 90 -class AkelEdit(edit.RichEdit20): 
 91   
 92          TextInfo=AkelEditTextInfo 
 93   
 94 -        def initOverlayClass(self): 
 95                  global AEGI_NEXTLINE 
 96                  version=self._getControlVersion() 
 97                  if version <1.6: 
 98                          AEGI_NEXTLINE =8 
 99                  else: 
100                          AEGI_NEXTLINE =24 
101   
102                  for gesture in ("kb:control+upArrow", "kb:control+downArrow"): 
103                          self.bindGesture(gesture, "caret_moveByLine") 
104   
105 -        def _getControlVersion(self): 
106                  res=watchdog.cancellableSendMessage(self.windowHandle,AEM_CONTROLVERSION,None,None) 
107                  major=winUser.LOBYTE(winUser.LOWORD(res)) 
108                  minor=winUser.HIBYTE(winUser.LOWORD(res)) 
109                  version=major+(0.1*minor) 
110                  return version 
111