canvas bug

src/base/canvas/canvas.js

@@ -29,6 +29,10 @@ BI.Canvas = BI.inherit(BI.Widget, {
         this._queue = [];
     },
 
+    mounted: function () {
+        this.stroke();
+    },
+
     _getContext: function () {
         if (!this.ctx) {
             this.ctx = this.canvas.getContext('2d');
@@ -113,20 +117,19 @@ BI.Canvas = BI.inherit(BI.Widget, {
         this._getContext().clearRect(0, 0, this.canvas.width, this.canvas.height);
     },
 
-    stroke: function (callback) {
-        var self = this;
-        BI.nextTick(function () {
-            var ctx = self._getContext();
-            BI.each(self._queue, function (i, q) {
+    stroke: function () {
+        var ctx = this._getContext();
+        if(!ctx){
+            return false;
+        }
+        BI.each(this._queue, function (i, q) {
             if (BI.isFunction(ctx[q.k])) {
                 ctx[q.k].apply(ctx, q.v);
             } else {
                 ctx[q.k] = q.v;
             }
         });
-            self._queue = [];
-            callback && callback();
-        });
+        this._queue = [];
     }
 });
 BI.shortcut("bi.canvas", BI.Canvas);