Fixed issue 456 by adding a svgCanvas.ready() function

git-svn-id: http://svg-edit.googlecode.com/svn/trunk@1328 eee81c28-f429-11dd-99c0-75d572ba1ddd

editor/svg-editor.js

@@ -2780,6 +2780,8 @@ function svg_edit_setup() {
 					}
 				});
 			}
+			
+			svgCanvas.runCallback();
 		}
 	});
 }());

editor/svgcanvas.js

@@ -7328,6 +7328,16 @@ function BatchCommand(text) {
 	
 	this.clear();
 
+	this.ready = function(cb) {
+		this.callback = cb;
+	}
+	
+	this.runCallback = function() {
+		if(this.callback) {
+			this.callback();
+		}
+	}
+	
 	function getElem(id) {
 		if(svgroot.querySelector) {
 			// querySelector lookup