invalidateDisplayList

當多次改變控件的某些屬性（如 高，寬，數據）後，調用該方法以便一次性的刷新相關屬性和佈局等。較之於一次一次的自動刷新，更有效率。

 

invalidateDisplayList():void--Calling this method results in a call to the component's validateDisplayList() method before the display list is rendered.

invalidateProperties():void--Calling this method results in a call to the component's validateProperties() method before the display list is rendered.

invalidateSize():void--Calling this method results in a call to the component's validateSize() method before the display list is rendered.

validateNow():void--Validates and updates the properties and layout of this object by immediately calling validateProperties(), validateSize(), and validateDisplayList(), if necessary.