automatically scrolling

["Yogesh Arora" <yogesh ar gmail com>]

Hi

I have a TextView inside a scroll window.
I want to create an animation effect in which TextView scrolls automatically

I know there is set_value function in Range class. But for calling
that function i will always have to calculate the value.

There should be some funtion such as step_increment page_increment can called
for step or page_increment

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Thanks
Yogesh

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