我有一个DataGrid,第一个列单元格中有一个带有嵌入图像和doubleClick事件链接的itemRenderer。
因此,当双击事件发生时,此渲染器捕获事件和处理程序。问题是我想在Datagrid中发送一个包含所选项目索引的事件,但我不知道如何进行ge。
s:GridItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" clipAndEnableScrolling="true"
width="50" height="30">
<fx:Script>
<![CDATA[
import events.EditItemEvent;
import mx.controls.Alert;
override public function prepare(hasBeenRecycled:Boolean):void {}
protected function btn_edit_doubleClickHandler(event:MouseEvent):void {
/* here I dispatchEvent with the 'index' of the selectedItem of the datagrid */
}
]]>
</fx:Script>
<s:Image id="btn_edit" horizontalCenter="0" source="@Embed('assets/images/edit_icon.png')"
verticalCenter="0"
doubleClickEnabled="true"
doubleClick="btn_edit_doubleClickHandler(event)"/>
有什么想法吗?
答案 0 :(得分:1)
您可以使用grid。selectedIndex吗?
老实说,我认为这是一个坏主意。渲染器不应该知道DataGrid的任何信息,包括selectedIndex。如果要调度自定义事件,则可以在displaylist层次结构中的某个位置操作渲染器数据;你应该包括数据,而不是索引。您的处理程序方法对数据进行操作。
答案 1 :(得分:0)
您可以通过它的所有者属性访问它:
(this.owner as DataGrid).selectedIndex
简单的itemRenderer,它调度自定义事件:
<s:GridItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx">
<fx:Script>
<![CDATA[
override public function prepare(hasBeenRecycled:Boolean):void {
lblData.text = data[column.dataField]
}
protected function onClickButton(ev:MouseEvent):void {
trace("ButtonDispatchItemRenderer::onClickButton");
//dispatch the Event which has a static const GET_SELECTED_INDEX for the event type
this.owner.dispatchEvent(new MyEvent(MyEvent.GET_SELECTED_INDEX));
}
]]>
</fx:Script>
<s:HGroup verticalAlign="baseline">
<s:Label id="lblData" top="9" left="7"/>
<s:Button label="dispatch" click="onClickButton(event)"/>
</s:HGroup>
</s:GridItemRenderer>
使用DataGrid监听事件的简单应用程序
<mx:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
minWidth="955" minHeight="600" creationComplete="onCreationComplete()">
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<fx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
import spark.components.gridClasses.GridColumn;
[Bindable]
public static var initDG:ArrayCollection = new ArrayCollection([
{label:"firstItem"}, {label:"secondItem"}, {label:"thirdItem"}
]);
protected function onCreationComplete():void {
dataGrid.addEventListener(MyEvent.GET_SELECTED_INDEX, onRendererButtonClick, false, 0, true);
}
protected function onRendererButtonClick(ev:MyEvent):void {
trace("Application::RenderButtonClick");
}
]]>
</fx:Script>
<s:VGroup>
<s:DataGrid id="dataGrid" verticalCenter="0" horizontalCenter="0" dataProvider="{initDG}">
<s:columns>
<s:ArrayList>
<s:GridColumn dataField="label" itemRenderer="renderers.ButtonDispatchItemRenderer"></s:GridColumn>
</s:ArrayList>
</s:columns>
</s:DataGrid>
</s:VGroup>
</mx:Application>
您必须在包含selectedIndex的事件中添加属性。并且您必须将值传递给渲染器内的事件(例如构造函数中的第二个参数)此示例仅调度事件