about Flex DataGrid edit
Summary(¸ÅÊö)£º Adobe Flex µÄ dataGrid ÓкÜÇ¿´óµÄ¹¦ÄÜ£¬±ÈÈçItemRenderer,headerRendererµÈ£¬¿ÉÒÔ·½±ãµØÊµÏÖ×Ô¼ºÏëÒªµÄ¹¦ÄÜ¡£µ«¶ÔdataGridÖ±½Ó±à¼²¢±£´æµ½Service¶Ë£¬¾ÍÓеãÂé·³ÁË¡£
Requirement(ÐèÇó)£º ¶ÔdataGrid½øÐе¥Î»¸ñ±à¼£¬ÈôÓб仯£¬±£´æµ½Service; ·ñÔò²»±£´æ¡£
Solution(½â¾ö·½°¸): ÔËÓÃDataGrid µÄ itemEditBegin ʼþ¡¢itemFocusOut ʼþ¡£
1. when the itemEditBegin is dispatched, the event handler should save this cell value as old value.(±à¼Ç°±£´æ¾ÉÖµ)
2. when the listener of itemFocusOut is responding, you should check the current cell to the old value. If it's value have changed, you should save the new value to Service.(±à¼ºóÅжϣ¬ÊÇ·ñ¸ü¸Ä¡£)
Example(Àý×Ó) as follow:
<mx:Script>
<![CDATA[
private var oldValueOfEditedItem: CreditVO;
private function creditDGEditBegin(event: DataGridEvent): void {
oldValueOfEditedItem = (event.itemRenderer.data as CreditVO).clone() as CreditVO;
}
private function editedItemChanged(newValue: CreditVO): Boolean {
return (newValue.amount != oldValueOfEditedItem.amount)||
(newValue.description != oldValueOfEditedItem.description);
}
private function creditDGEditEnd(event: DataGridEvent): void {
var newValue: CreditVO = event.itemRenderer.data as CreditVO;
if (editedItemChanged(newValue)) {
dispatchEvent(new UpdateCreditEvent(newValue))
}
}
]]>
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