#virtualBuffers/IAccessible.py
#A part of NonVisual Desktop Access (NVDA)
#Copyright (C) 2006-2007 NVDA Contributors <http://www.nvda-project.org/>
#This file is covered by the GNU General Public License.
#See the file COPYING for more details.

import gc
import os
import globalVars
from logHandler import log
import winUser
import NVDAObjects
import NVDAObjects.window
import NVDAObjects.IAccessible
import controlTypes
import NVDAObjects.window
import speech
import IAccessibleHandler

runningTable=set()

def getVirtualBuffer(obj):
	for v in runningTable:
		if v.isNVDAObjectInVirtualBuffer(obj):
			return v

def update(obj):
	for v in list(runningTable):
		if not v.isAlive():
			killVirtualBuffer(v)
	windowClassName=obj.windowClassName
	role=obj.role
	states=obj.states
	#Gecko with IAccessible2 support
	if isinstance(obj,NVDAObjects.IAccessible.IAccessible) and isinstance(obj.IAccessibleObject,IAccessibleHandler.IAccessible2) and windowClassName.startswith('Mozilla') and role==controlTypes.ROLE_DOCUMENT:
		if controlTypes.STATE_READONLY in states and controlTypes.STATE_BUSY not in states and windowClassName=="MozillaContentWindowClass":
			classString="virtualBuffers.gecko_ia2.Gecko_ia2"
		else:
			return
	#Gecko only with IAccessible support
	elif isinstance(obj,NVDAObjects.IAccessible.IAccessible) and windowClassName.startswith('Mozilla') and role==controlTypes.ROLE_DOCUMENT and controlTypes.STATE_READONLY in states:
		classString="virtualBuffers_old.gecko.Gecko"
	#Adobe documents with IAccessible
 	elif isinstance(obj,NVDAObjects.IAccessible.IAccessible) and windowClassName=="AVL_AVView" and role in (controlTypes.ROLE_DOCUMENT,controlTypes.ROLE_PAGE) and controlTypes.STATE_READONLY in states:
		classString="virtualBuffers_old.adobe.Adobe"
	#MSHTML
 	elif isinstance(obj,NVDAObjects.IAccessible.IAccessible) and windowClassName=="Internet Explorer_Server" and controlTypes.STATE_FOCUSED in states: 
		info=winUser.getGUIThreadInfo(winUser.getWindowThreadProcessID(obj.windowHandle)[1])
		if not info.flags&winUser.GUI_CARETBLINKING or info.hwndCaret!=obj.windowHandle:
			classString="virtualBuffers_old.MSHTML.MSHTML"
		else:
			return
	else:
		return
	modString,classString=os.path.splitext(classString)
	classString=classString[1:]
	log.debug("loading module %s, class %s"%(modString,classString))
	mod=__import__(modString,globals(),locals(),[""])
	log.debug("mod contains %s"%dir(mod))
	newClass=getattr(mod,classString)
	log.debug("virtualBuffers.IAccessible.update: adding %s at %s (%s)"%(newClass,obj.windowHandle,obj.windowClassName))
	virtualBufferObject=newClass(obj)
	if not virtualBufferObject.isAlive():
		return None
	if hasattr(virtualBufferObject,'loadBuffer'):
		try:
			virtualBufferObject.loadBuffer()
		except:
			log.error("error loading buffer",exc_info=True)
			return None
	runningTable.add(virtualBufferObject)
	return virtualBufferObject

def killVirtualBuffer(virtualBufferObject):
	try:
		runningTable.remove(virtualBufferObject)
	except KeyError:
		return
	if hasattr(virtualBufferObject,'unloadBuffer'):
		virtualBufferObject.unloadBuffer()

def cleanupVirtualBuffers():
	"""Kills any currently running virtualBuffers"""
	for v in list(runningTable):
		killVirtualBuffer(v)

def reportPassThrough(virtualBuffer):
	"""Speaks the state of virtualBufferPassThroughMode if it has changed.
	@param virtualBuffer: The current virtual buffer.
	@type virtualBuffer: L{virtualBuffers.VirtualBuffer}
	"""
	if virtualBuffer.passThrough != reportPassThrough.last:
		speech.speakMessage(_("focus mode") if virtualBuffer.passThrough else _("browse mode"))
		reportPassThrough.last = virtualBuffer.passThrough
reportPassThrough.last = False