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06-09-2009, 12:37 PM #1
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- Jun 2009
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What is the scrolling principle for a displayobj
Would you please let me know the scrolling principle for a displayobj (i.e linechart) in flex?
For example, I have a panel which contains a linechart and a curve will be displayed finally. If the linechart's height is bigger than the panel's, a scrollbar will be shown, and we can scroll the scrollbar to scroll the linechart in order to show the whole curve.
If I create a new VScrollBar, and bind its event.position with verticalScrollPosition of panel on scroll(event) event, I can use this VScrollBar to scroll the linechart as well. However, how can I implement the scrolling function without using verticalScrollPosition of panel? In other word, I want to implement the scrolling by myself, how to do it?
Before doing that, I need know what's the scrolling principle for a panel? In Flex's guide, I found mask and scrollRect should be the two methods to implement the scrolling function. But according to my debugging against my application, I fond both mask and scrollRect for panel are NULL and I can not assign a new mask or scrollRect to it.
Who can do me a favor? Thanks in advance.