Scrollbar Widget #5
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參考: go/ui#5
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Add a Scrollbar widget to the UI toolkit. It would provide scroll buttons, a draggable bar, and bind to a floating point number indicating the scroll position.
It would be a generic widget that can serve as a number slider or be composed with bigger, more complex widgets to accommodate things like scrollable text boxes or scrollable menus and so on.
The Scrollbar widget would consist of:
Options for the widget would include: