#mouseHandler.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 time
import tones
import ctypes
import winUser
import queueHandler
import api
import speech
import NVDAObjects.JAB
import NVDAObjects.IAccessible
import globalVars
from logHandler import log
import config
import IAccessibleHandler
import JABHandler
import mouseHook

WM_MOUSEMOVE=0x0200
WM_LBUTTONDOWN=0x0201
WM_LBUTTONUP=0x0202
WM_LBUTTONDBLCLK=0x0203
WM_RBUTTONDOWN=0x0204
WM_RBUTTONUP=0x0205
WM_RBUTTONDBLCLK=0x0206

curMousePos=(0,0)
mouseMoved=False
curMouseShape=""
mouseShapeChanged=0
#: The time (in seconds) at which the last mouse event occurred.
#: @type: float
lastMouseEventTime=0

def updateMouseShape(name):
	global curMouseShape, mouseShapeChanged
	if not name or name==curMouseShape:
		return
	curMouseShape=name
	mouseShapeChanged=1

def playAudioCoordinates(x, y, detectBrightness=True,blurFactor=0):
	screenWidth,screenHeight=api.getDesktopObject().location[2:]
	x=min(max(0,x),screenWidth-1)
	y=min(max(0,y),screenHeight-1)
	minPitch=config.conf['mouse']['audioCoordinates_minPitch']
	maxPitch=config.conf['mouse']['audioCoordinates_maxPitch']
	curPitch=minPitch+((maxPitch-minPitch)*((screenHeight-y)/float(screenHeight)))
	if detectBrightness:
		screenDC=ctypes.windll.user32.GetDC(0)
		brightness=0
		for i in range(x-blurFactor,x+blurFactor+1):
			for j in range(y-blurFactor,y+blurFactor+1):
				if i>=0 and i<screenWidth and j>=0 and j<screenHeight:
					p=ctypes.windll.gdi32.GetPixel(screenDC,i,j)
					grey=0.3*((p>>16)&0xff)+0.59*((p>>8)&0xff)+0.11*(p&0xff)
					brightness=(brightness+(grey/255))/2
		minBrightness=config.conf['mouse']['audioCoordinates_minVolume']
		maxBrightness=config.conf['mouse']['audioCoordinates_maxVolume']
		brightness=(brightness*(maxBrightness-minBrightness))+minBrightness
		ctypes.windll.user32.ReleaseDC(0,screenDC)
	else:
		brightness=config.conf['mouse']['audioCoordinates_maxVolume']
	leftVolume=(85*((screenWidth-float(x))/screenWidth))*brightness
	rightVolume=(85*(float(x)/screenWidth))*brightness
	tones.beep(curPitch,40,left=leftVolume,right=rightVolume)

#Internal mouse event

def internal_mouseEvent(msg,x,y,injected):
	global mouseMoved, curMousePos, lastMouseEventTime
	lastMouseEventTime=time.time()
	if injected:
		return True
	if not config.conf['mouse']['enableMouseTracking']:
		return True
	try:
		curMousePos=(x,y)
		if msg==WM_MOUSEMOVE and (config.conf['mouse']['reportTextUnderMouse'] or config.conf['mouse']['reportObjectRoleOnMouseEnter'] or config.conf['mouse']['audioCoordinatesOnMouseMove']):
			mouseMoved=True
		elif msg in (WM_LBUTTONDOWN,WM_RBUTTONDOWN):
			queueHandler.queueFunction(queueHandler.eventQueue,speech.cancelSpeech)
	except:
		log.error("", exc_info=True)
	return True

def executeMouseMoveEvent(x,y):
	oldMouseObject=api.getMouseObject()
	try:
		(oldLeft,oldTop,oldWidth,oldHeight)=oldMouseObject.location
	except:
		oldLeft=oldTop=oldWidth=oldHeight=0
	mouseObject=oldMouseObject
	windowAtPoint=ctypes.windll.user32.WindowFromPoint(x,y)
	if JABHandler.isRunning and JABHandler.isJavaWindow(windowAtPoint):
		if not isinstance(oldMouseObject,NVDAObjects.JAB.JAB) or x<oldLeft or x>(oldLeft+oldWidth) or y<oldTop or y>(oldTop+oldHeight):
			oldJabContext=JABHandler.JABContext(hwnd=windowAtPoint)
		else:
			oldJabContext=oldMouseObject.jabContext
		res=oldJabContext.getAccessibleContextAt(x,y)
		if res:
			mouseObject=NVDAObjects.JAB.JAB(jabContext=res)
	else: #not a java window
		if not isinstance(oldMouseObject,NVDAObjects.IAccessible.IAccessible) or x<oldLeft or x>(oldLeft+oldWidth) or y<oldTop or y>(oldTop+oldHeight):
			mouseObject=NVDAObjects.IAccessible.getNVDAObjectFromPoint(x,y)
		else:
			res=IAccessibleHandler.accHitTest(oldMouseObject.IAccessibleObject,oldMouseObject.IAccessibleChildID,x,y)
			if res:
				mouseObject=NVDAObjects.IAccessible.IAccessible(IAccessibleObject=res[0],IAccessibleChildID=res[1])
	if not mouseObject:
		return
	try:
		(left,top,width,height)=mouseObject.location
	except:
		left=top=width=height=0
	if x<left or x>(left+width) or y<top or y>(top+height):
		return
	api.setMouseObject(mouseObject)
	try:
		mouseObject.event_mouseMove(x,y)
		oldMouseObject=mouseObject
	except:
		log.error("api.notifyMouseMoved", exc_info=True)

#Register internal mouse event

def initialize():
	global curMousePos, screenDC, screenWidth, screenHeight
	(x,y)=winUser.getCursorPos()
	mouseObj=NVDAObjects.IAccessible.getNVDAObjectFromPoint(x,y)
	if not mouseObj:
		mouseObj=api.getDesktopObject()
	api.setMouseObject(mouseObj)
	curMousePos=(x,y)
	screenWidth,screenHeight=api.getDesktopObject().location[2:]
	mouseHook.initialize(internal_mouseEvent)

def pumpAll():
	global mouseMoved, curMousePos, mouseShapeChanged, curMouseShape
	if mouseMoved:
		mouseMoved=False
		(x,y)=curMousePos
		if config.conf["mouse"]["audioCoordinatesOnMouseMove"]:
			playAudioCoordinates(x,y,config.conf['mouse']['audioCoordinates_detectBrightness'],config.conf['mouse']['audioCoordinates_blurFactor'])
		executeMouseMoveEvent(x,y)
	if config.conf["mouse"]["reportMouseShapeChanges"] and mouseShapeChanged>0:
		if mouseShapeChanged==10:
			mouseShapeChanged=0
			speech.speakMessage(_("%s cursor")%curMouseShape)
		else:
			mouseShapeChanged+=1

def terminate():
	mouseHook.terminate()