如何阻止 Accordion segment 切換？
昨天被問到：如何在一個 Accordion segment 切換前攔截下來，做些檢查，然後才允許它繼續切換？
例如：Accordion 裏有三個 segments, A, B, C，希望從 A 切換到 C 前先檢查 A 的內容是否正確，然後才允許切過去。
原本以為應該可以偵聽 Accordion 裏面的 change 事件，然後透過 event.preventDefault() 達到攔截的目地，但很遺憾這招不成功。
所以只好走上繼承再改寫的路。
基本上是 override selectedIndex 後動手腳即可，quick and easy 
Actionscript:
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public var isDirty:Boolean = true;
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//user wanted to swtich to this index
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private var targetIndex:int;
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override public function set selectedIndex(value:int):void{
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if( isDirty ){
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targetIndex = value;
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Alert.show( "do you want to save ?", "Save or Not ?", Alert.YES|Alert.NO, null, onClose );
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}else{
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super.selectedIndex = value;
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}
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}
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function onClose( evt:CloseEvent ){
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if( evt.detail == Alert.YES ){
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trace("you should press save button in current screen");
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}else{
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isDirty = false;
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this.selectedIndex = targetIndex;
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}
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}
改好的檔案+範例
(注意這是用 Flex Builder 3 Beta2 製作)
by admin
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