Address issue 526: new file that is part of patch to handle touch events

git-svn-id: http://svg-edit.googlecode.com/svn/trunk@2086 eee81c28-f429-11dd-99c0-75d572ba1ddd

editor/touch.js

@@ -0,0 +1,30 @@
+// http://ross.posterous.com/2008/08/19/iphone-touch-events-in-javascript/
+
+function touchHandler(event)
+{   
+    
+    var touches = event.changedTouches,
+        first = touches[0],
+        type = "";
+         switch(event.type)
+    {
+        case "touchstart": type="mousedown"; break;
+        case "touchmove":  type="mousemove"; break;        
+        case "touchend":   type="mouseup"; break;
+        default: return;
+    }
+
+             //initMouseEvent(type, canBubble, cancelable, view, clickCount, 
+    //           screenX, screenY, clientX, clientY, ctrlKey, 
+    //           altKey, shiftKey, metaKey, button, relatedTarget);
+    
+    var simulatedEvent = document.createEvent("MouseEvent");
+    simulatedEvent.initMouseEvent(type, true, true, window, 1, 
+                              first.screenX, first.screenY, 
+                              first.clientX, first.clientY, false, 
+                              false, false, false, 0/*left*/, null);
+    if(touches.length < 2) {
+      first.target.dispatchEvent(simulatedEvent);
+      event.preventDefault();
+    }
+}