From 1ccd63ee312af2106cc6415bb73206d98a87ff51 Mon Sep 17 00:00:00 2001
From: dingpinglv <dingping.lv@cocos2d-x.org>
Date: Sat, 29 Sep 2012 14:31:16 +0800
Subject: [PATCH] fixed #1361 add page visibility event to fixed delta time
 mistake for cc.Director

---
 cocos2d/CCDirector.js             | 15 ++++++++++----
 cocos2d/platform/CCApplication.js | 34 ++++++++++++++++++++++++++++++-
 2 files changed, 44 insertions(+), 5 deletions(-)

diff --git a/cocos2d/CCDirector.js b/cocos2d/CCDirector.js
index 69cbfcc7ae..5f1f305a3b 100644
--- a/cocos2d/CCDirector.js
+++ b/cocos2d/CCDirector.js
@@ -169,6 +169,7 @@ cc.Director = cc.Class.extend(/** @lends cc.Director# */{
     _watcherSender:null,
 
     _currTimeValue:null,
+    _isBlur:false,
 
     /**
      * Constructor
@@ -176,10 +177,16 @@ cc.Director = cc.Class.extend(/** @lends cc.Director# */{
     ctor:function () {
         this._currTimeValue = new cc.timeval();
         this._lastUpdate = new cc.timeval();
-        var selfPointer = this;
-        window.addEventListener("focus",function(){
-            selfPointer._lastUpdate = cc.Time.gettimeofdayCocos2d(selfPointer._lastUpdate);
-        }, false);
+        if(!cc.isAddedHiddenEvent){
+            var selfPointer = this;
+            window.addEventListener("focus",function(){
+                selfPointer._lastUpdate = cc.Time.gettimeofdayCocos2d(selfPointer._lastUpdate);
+            }, false);
+        }
+    },
+
+    _resetLastUpdate:function(){
+        this._lastUpdate = cc.Time.gettimeofdayCocos2d(this._lastUpdate);
     },
 
     /**
diff --git a/cocos2d/platform/CCApplication.js b/cocos2d/platform/CCApplication.js
index ce0cf7e531..cc7414ed11 100644
--- a/cocos2d/platform/CCApplication.js
+++ b/cocos2d/platform/CCApplication.js
@@ -122,6 +122,9 @@ if (!window.console) {
     };
 }
 
+
+cc.isAddedHiddenEvent = false;
+
 /**
  * <p>
  *   setup game main canvas,renderContext,gameDiv and drawingUtil with argument  <br/>
@@ -197,8 +200,37 @@ cc.setup = function (el, width, height) {
      }
      }, true);
      */
+
+    var hidden, visibilityChange;
+    if (typeof document.hidden !== "undefined") {
+        hidden = "hidden";
+        visibilityChange = "visibilitychange";
+    } else if (typeof document.mozHidden !== "undefined") {
+        hidden = "mozHidden";
+        visibilityChange = "mozvisibilitychange";
+    } else if (typeof document.msHidden !== "undefined") {
+        hidden = "msHidden";
+        visibilityChange = "msvisibilitychange";
+    } else if (typeof document.webkitHidden !== "undefined") {
+        hidden = "webkitHidden";
+        visibilityChange = "webkitvisibilitychange";
+    }
+
+    function handleVisibilityChange() {
+        if (!document[hidden])
+            cc.Director.getInstance()._resetLastUpdate();
+    }
+
+    if (typeof document.addEventListener === "undefined" ||
+        typeof hidden === "undefined") {
+        cc.isAddedHiddenEvent = false;
+    } else {
+        cc.isAddedHiddenEvent = true;
+        document.addEventListener(visibilityChange, handleVisibilityChange, false);
+    }
 };
 
+
 /**
  * Run main loop of game engine
  * @class
@@ -244,7 +276,7 @@ cc.Application = cc.Class.extend(/** @lends cc.Application# */{
             return 0;
         }
         // TODO, need to be fixed.
-        if (window.requestAnimFrame && this._animationInterval == 1/60) {
+        if (window.requestAnimFrame && this._animationInterval == 1 / 60) {
             var callback = function () {
                 cc.Director.getInstance().mainLoop();
                 window.requestAnimFrame(callback);