From d7dbc4237268ad0a4aadd210e36b8cd288a5c383 Mon Sep 17 00:00:00 2001
From: Hirokazu Takahashi <taka@valinux.co.jp>
Date: Mon, 15 Oct 2012 19:04:38 +0900
Subject: [PATCH] scripts' initialization control.  - Initalize scripts in
 register order.  - Fire a NoVnc.onload event when all scripts are loaded and
 initialized.  - noVNC starts its service when catching a NoVnc.onload event.

---
 include/start.js                    |  2 +-
 include/vnc.js                      | 43 ++++++++++++++++++++++++++
 include/web-socket-js/web_socket.js |  4 +--
 include/websock.js                  | 47 ++++++++++++-----------------
 vnc_auto.html                       |  2 +-
 5 files changed, 67 insertions(+), 31 deletions(-)

diff --git a/include/start.js b/include/start.js
index b5d90b4c..e3d99a1d 100644
--- a/include/start.js
+++ b/include/start.js
@@ -1 +1 @@
-window.onload = UI.load;
+NoVnc.onload = UI.load;
diff --git a/include/vnc.js b/include/vnc.js
index 435fdc47..e840d361 100644
--- a/include/vnc.js
+++ b/include/vnc.js
@@ -9,6 +9,12 @@
 /*jslint evil: true */
 /*global window, document, INCLUDE_URI */
 
+var NoVnc = {};
+NoVnc.onload = null;
+NoVnc.init_scripts = [];
+NoVnc.loading = 0;
+
+
 /*
  * Load supporting scripts
  */
@@ -21,11 +27,48 @@ function get_INCLUDE_URI() {
  */
 function load_scripts(base, files) {
     var head = document.getElementsByTagName('head')[0];
+
+    function onloadhook () {
+        if (this.initState)  //Already initialized
+            return;
+        this.initState = true;
+        NoVnc.loading--;
+        initscripts();
+        if (NoVnc.loading === 0 && !!NoVnc.onload) {
+            NoVnc.onload();
+            NoVnc.onload = null;
+        }
+    }
+    function initscripts() {
+        // Call the initialization routines in register order when all
+        // the scripts have been loaded.
+        // Notice: These routines may also call load_scripts to start
+        //         loading other scripts.
+        while (NoVnc.loading === 0 && NoVnc.init_scripts.length > 0) {
+            var script = NoVnc.init_scripts[0];
+            NoVnc.init_scripts.splice(0, 1);
+            // It is assumed that ABC.js should have _init_ABC() to
+            // initialize itself.
+            var f = script.src.split("/");
+            f = "_init_" + f[f.length -1].split(".")[0].replace(/[\-\+]/,"_");
+            eval("if (typeof " + f + " !== 'undefined') " + f + "()");
+        }
+    }
+
     for (var i=0; i<files.length; i++) {
         var script = document.createElement('script');
         script.type = 'text/javascript';
+        NoVnc.loading++;
+        script.onload = onloadhook;
+        script.onreadystatechange = function () {
+            if (this.readyState == 'complete' || this.readyState == 'loaded')
+                this.onload();
+        }
+        script.initState = false;
         script.src = base + files[i];
         head.appendChild(script);
+        NoVnc.init_scripts = NoVnc.init_scripts.concat([script]);
+
     }
 }
 
diff --git a/include/web-socket-js/web_socket.js b/include/web-socket-js/web_socket.js
index 06cc5d02..5930f530 100644
--- a/include/web-socket-js/web_socket.js
+++ b/include/web-socket-js/web_socket.js
@@ -3,7 +3,7 @@
 // Reference: http://dev.w3.org/html5/websockets/
 // Reference: http://tools.ietf.org/html/rfc6455
 
-(function() {
+function _init_web_socket() {
   
   if (window.WEB_SOCKET_FORCE_FLASH) {
     // Keeps going.
@@ -388,4 +388,4 @@
     });
   }
   
-})();
+}
diff --git a/include/websock.js b/include/websock.js
index ccb7d4c1..a3b35903 100644
--- a/include/websock.js
+++ b/include/websock.js
@@ -25,34 +25,27 @@
 // To enable WebSocket emulator debug:
 //window.WEB_SOCKET_DEBUG=1;
 
-if (window.WebSocket && !window.WEB_SOCKET_FORCE_FLASH) {
-    Websock_native = true;
-} else if (window.MozWebSocket && !window.WEB_SOCKET_FORCE_FLASH) {
-    Websock_native = true;
-    window.WebSocket = window.MozWebSocket;
-} else {
-    /* no builtin WebSocket so load web_socket.js */
+function _init_websock() {
+    if (window.WebSocket && !window.WEB_SOCKET_FORCE_FLASH) {
+        Websock_native = true;
+    } else if (window.MozWebSocket && !window.WEB_SOCKET_FORCE_FLASH) {
+        Websock_native = true;
+        window.WebSocket = window.MozWebSocket;
+    } else {
+        /* no builtin WebSocket so load web_socket.js */
 
-    Websock_native = false;
-    (function () {
-        function get_INCLUDE_URI() {
-            return (typeof INCLUDE_URI !== "undefined") ?
-                INCLUDE_URI : "include/";
-        }
-
-        var start = "<script src='" + get_INCLUDE_URI(),
-            end = "'><\/script>", extra = "";
-
-        window.WEB_SOCKET_SWF_LOCATION = get_INCLUDE_URI() +
-                    "web-socket-js/WebSocketMain.swf";
-        if (Util.Engine.trident) {
-            Util.Debug("Forcing uncached load of WebSocketMain.swf");
-            window.WEB_SOCKET_SWF_LOCATION += "?" + Math.random();
-        }
-        extra += start + "web-socket-js/swfobject.js" + end;
-        extra += start + "web-socket-js/web_socket.js" + end;
-        document.write(extra);
-    }());
+        Websock_native = false;
+        (function () {
+            window.WEB_SOCKET_SWF_LOCATION = get_INCLUDE_URI() +
+                        "web-socket-js/WebSocketMain.swf";
+            if (Util.Engine.trident) {
+                Util.Debug("Forcing uncached load of WebSocketMain.swf");
+                window.WEB_SOCKET_SWF_LOCATION += "?" + Math.random();
+            }
+            load_scripts(get_INCLUDE_URI() + "web-socket-js/",
+                    ["swfobject.js", "web_socket.js"]);
+        }());
+    }
 }
 
 
diff --git a/vnc_auto.html b/vnc_auto.html
index f5d28257..0185db54 100644
--- a/vnc_auto.html
+++ b/vnc_auto.html
@@ -84,7 +84,7 @@
             }
         }
 
-        window.onload = function () {
+        NoVnc.onload = function () {
             var host, port, password, path, token;
 
             $D('sendCtrlAltDelButton').style.display = "inline";