Question

我已经设置了这样的itemrenderer包：

打包myrenderers { import mx.controls.advancedDataGridClasses.AdvancedDataGridItemRenderer;

public class theHeaderRenderer extends AdvancedDataGridItemRenderer
{
    public function theHeaderRenderer()
    {
        super();
        setStyle("verticalAlign","middle"); 
    }
}

}

但是，当我在AdvancedDataGridColumn标记中包含以下行时，

            <fx:Component>
                <myrenderers:theHeaderRenderer"/>
            </fx:Component>

        </mx:headerRenderer>

            <fx:Component>
                <renderers:someotherrenderer/>
            </fx:Component>

        </mx:itemRenderer>

我收到以下错误：

TypeError: Error #1034: Type Coercion failed: cannot convert mx.controls.dataGridClasses::DataGridListData@ac84f81 to mx.controls.advancedDataGridClasses.AdvancedDataGridListData. at mx.controls.advancedDataGridClasses::AdvancedDataGridItemRenderer/set listData()[E:\dev\4.x\frameworks\projects\datavisualization\src\mx\controls\advancedDataGridClasses\AdvancedDataGridItemRenderer.as:232] at mx.controls::DataGrid/http://www.adobe.com/2006/flex/mx/internal::calculateHeaderHeight()[E:\dev\4.x\frameworks\projects\framework\src\mx\controls\DataGrid.as:2182] at mx.controls.dataGridClasses::DataGridHeader/measure()[E:\dev\4.x\frameworks\projects\framework\src\mx\controls\dataGridClasses\DataGridHeader.as:201] at mx.core::UIComponent/measureSizes()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\UIComponent.as:8216] at mx.core::UIComponent/validateSize()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\UIComponent.as:8140] at mx.managers::LayoutManager/validateSize()[E:\dev\4.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:617] at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\4.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:709] at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\4.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1072]

有谁能建议我如何遇到这个问题？

谢谢

Answer 1

首先，我建议您从AdvancedDataGridHeaderRenderer而不是AdvancedDataGridItemRenderer扩展自定义headerRenderer。

其次，看起来您正在混合mx:DataGrid和mx:AdvancedDataGrid。我猜这是你的类型强制错误的原因。确保您的MXML看起来像这样：

<mx:AdvancedDataGrid>
    <mx:columns>
        <mx:AdvancedDataGridColumn dataField="foo" headerRenderer="myrenderers.theHeaderRenderer"/>
    </mx:columns>
</mx:AdvancedDataGrid>

扩展AdvancedDataGridRenderer时出错

1 个答案: