定制Flex菜单图标
2018-09-06 13:15
默认Menu上的Icon必须通过iconField和iconFunction去指定,但是这两种方式都必须用嵌入资源Class名字去指定Icon,如果想用动态的图片(比如URL)作为Menu的Icon,就必须定制一把MenuItemRenderer。
首先写个类CustomMenuItemRenderer继承MenuItemRenderer,里面增加一个如下变量作为自定义Icon的组件:
view sourceprint?1 private var image:UIComponent = new UIComponent();
然后里面重写measure方法(计算MenuItem的宽高):
view sourceprint?01 override protected function measure():void {
03
04 if (separatorIcon listData == null) {
05 return;
06 }
07
08 var imageAsset:IImageAsset = Utils.getImageAsset(data.@iconName);
09 if(imageAsset == null){
10 return;
11 }
12 measuredWidth += imageAsset.width;
13 if(imageAsset.height > measuredHeight){
14 measuredHeight = imageAsset.height;
15 }
16 }
重写commitProperties方法(重画并增加Icon,指定Icon宽高):
view sourceprint?01 override protected function commitProperties():void {
03
04 if (separatorIcon listData == null) {
05 return;
06 }
07
08 var imageAsset:IImageAsset = Utils.getImageAsset(data.@iconName);
09 if(imageAsset == null){
10 return;
11 }
12 image.width = imageAsset.width;
13 image.height = imageAsset.height;
14 image.graphics.beginBitmapFill(imageAsset.getBitmapData());
15 image.graphics.drawRect(0, 0, image.width, image.height);
16 image.graphics.endFill();
18 this.addChild(image);
19 }
20 }
重写updateDisplayList方法(指定Icon的位置,由于Icon在左边,所以super一把后,再移动Labe等的位置):
view sourceprint?01 override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void{
02 super.updateDisplayList(unscaledWidth, unscaledHeight);
03
04 if (separatorIcon listData == null) {
05 return;
06 }
07
08 var imageAsset:IImageAsset = Utils.getImageAsset(data.@iconName);
09 if(imageAsset == null){
10 return;
11 }
12 if(typeIcon){
13 typeIcon.x += imageAsset.width;
14 }
15 if(label){
16 label.x += imageAsset.width;
17 }
18 }
重写measuredIconWidth方法(计算Icon的宽度):
view sourceprint?1 override public function get measuredIconWidth():Number {
2 var imageAsset:IImageAsset = Utils.getImageAsset(data.@iconName);
3 if(imageAsset == null){
4 return 0 ;
5 }else{
6 var horizontalGap:Number = getStyle(horizontalGap);
7 return imageAsset.width + horizontalGap;
8 }
9 }
最后用自定义的CustomMenuItemRenderer指定Menu的ItemRenderer,注意使用iconName指定icon的名字(这里为TWaver注册图片的名字)。也可以用别的名字,注意把CustomMenuItemRenderer里面的@iconName换一下
view sourceprint?1 var menu:Menu = Menu.createMenu(network, myMenuData, false);
3 menu.itemRenderer = new ClassFactory(CustomMenuItemRenderer);
4 var point:Point = network.getLogicalPoint(event.mouseEvent);
5 network.callLater(function():void{
6 menu.show(point.x, point.y);
7 });
指定Menu数据的XML文件如下:
view sourceprint?01 <mx:XML format=e4x id=myMenuData>
02 <root>
03 <menuitem label=
04 <menuitem label=TWaver type=check toggled=true>
05 <menuitem label=Java type=radio groupName=one/>
06 <menuitem label=Web type=radio groupName=one toggled=true/>
07 <menuitem label=Flex type=radio groupName=one iconName=bus_icon/>
08 <menuitem label=Silverlight type=radio groupName=one/>
09 </menuitem>
10 <menuitem type=separator/>
11 <menuitem label=2BizBox iconName=data_icon/>
12 </menuitem>
13 <menuitem label=
15 </root>
16 </mx:XML>
17 </code>
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