Item Renderers in Flex Josh Tynjala Flash and Flex…….ppt

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2017-03-31 发布于广东
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Item Renderers in Flex Josh Tynjala Flash and Flex…….ppt

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Item Renderers in FlexJosh TynjalaFlash and Flex Engineer, Yahoo!360Flex Atlanta Yahoo! Flash Platform /flash/ Yahoo! Flash Blog / Zeus Labs http://www.zeuslabs.us/ Agenda Custom Renderers for Existing Components Build an Item Renderer System Custom Renderers for Existing Components Setting Custom Renderers in MXML Option 1 mx:List itemRenderer=mx.controls.Label Option 2 (more in a bit) mx:List mx:itemRenderer mx:Component mx:Label/ /mx:Component /mx:itemRenderer /mx:List Setting Custom Renderers in ActionScript mx.core.IFactory mx.core.ClassFactory import mx.controls.Label; itemRenderer = new ClassFactory( Label ); itemRperties = { minWidth: 400 } var instance:IListItemRenderer = itemRenderer.newInstance(); Creating Custom Renderers in MXML Uses special mx:Component tag. Advantages: No extra classes. Easy MXML layout. Disadvantages: Can be hard to maintain. Must understand scope. MXML Item Renderer Scope mx:Array id=dp mx:StringOne/mx:String mx:StringTwo/mx:String mx:StringThree/mx:String /mx:Array mx:List dataProvider={dp} mx:itemRenderer mx:Component !-- this is like a new MXML file! -- mx:CheckBox/ /mx:Component /mx:itemRenderer /mx:List Using outerDocument in mx:Component/ Refers to scope of MXML outside the renderer. mx:Component mx:CheckBox change=trace(outerDocument.dp.indexOf(this.data)) /mx:CheckBox /mx:Component Creating Custom Renderers in ActionScript Implement the required interface IListItemRenderer Used by List, Tree, and DataGrid Optionally, implement the drop-in interface IDropInListItemRenderer Drop-In Renderers A common data structure Promotes encapsulation The standard Flex components are ready for drop-in ListData Class The common data structure Properties columnIndex rowIndex icon label labelField uid owner Custom Renderer Examples Font List (MXML) Color List (MXML) CheckBox List (ActionScript) Build an Item Renderer System Expose Common Renderer Properties Examples from List: l