Change thumb width in scrollbar by dragging the thumb

Hi All,
I'd like to use a JScrollBar that implements a user-friendly zooming capability. What I mean is the possibility for the user to place the mouse over the scrollbar's thumb edge and drag the thumb edge changing (enlarging or reducing) its width. By knowing the new width of the thumb, I then could change the amount of graphics shown in a separate panel.
Any suggestion? Does anybody know if that is possible at all without using third party custom UI objects?
Thanks in advance
Antonio

I think you can do this by adding a MouseAdapter to JScrollBar. When the user clicks and drags on the edge of the thumb you change the BoundedRangeModel's values by calling setValues(int,int,int,int) on the JScrollBar. The user is either adjusting the value or the extent depending on which side of the thumb the user clicked on. Add a MouseMotionListener to change the cursor of the mouse when it's over the thumb's edge.
Your display component can share the BoundedRangeModel with the JScrollBar so that it can listen for the changes in the value or extent and adjust itself accordingly.
But then again why not go with the simplest thing that could work and use a JSlider? (0-100%)
charlie

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Change thumb width in scrollbar by dragging the thumb

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