Issue 5662 in pharo: One click on scroll bar scrolls two pages down

Status: Accepted
Owner: [hidden email]

New issue 5662 by [hidden email]: One click on scroll bar scrolls  
two pages down
http://code.google.com/p/pharo/issues/detail?id=5662

Open a new Pharo 1.4 image,
click on the white part of the scroll bar in the workspace,
it scrolls two pages down to

Some Items of 1.4
----------------

instead of one page down to

About this release
---------------

This seems to work as expected in Squeak and Cuis.



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Comment #1 on issue 5662 by [hidden email]: One click on scroll bar  
scrolls two pages down
http://code.google.com/p/pharo/issues/detail?id=5662

I don't see the point in page-wise scrolling when clicking in the empty  
part of a scrollbar.
Hence if someone will eventually fix this make an option to select between  
direct and page-wise scrolling

- page up / down: use page up / down keys
- top / bottom: home / end keys
- scroll to a specific point: drag


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Comment #2 on issue 5662 by [hidden email]: One click on scroll bar  
scrolls two pages down
http://code.google.com/p/pharo/issues/detail?id=5662

Sure, there are now many ways, like using mouse scroll button.

But this "click on scroll bar" behaviour exists for a long time in  
Smalltalk, has been adopted by almost every GUI, and as such is a well  
known "natural" feel. I use it without even thinking whether this is the  
best way to scroll or not.
So why remove it ?
In any case, scrolling two pages down makes absolutely no sense.

Keyboard events are a different thing because they move the text insertion  
point.


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Updates:
        Labels: Milestone-1.4 Milestone-2.0 Type-Bug

Comment #3 on issue 5662 by [hidden email]: One click on scroll bar  
scrolls two pages down
http://code.google.com/p/pharo/issues/detail?id=5662

Yes, this bug is very disruptive. Users (including me!) expect it for the  
reasons nicolas listed. It somehow got changed in 1.4 and is still broken  
in 2.0


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Updates:
        Status: Duplicate
        Mergedinto: 6083

Comment #4 on issue 5662 by [hidden email]: One click on scroll bar  
scrolls two pages down
http://code.google.com/p/pharo/issues/detail?id=5662

Got it! It has nothing to do with ScrollBar (just a symptom). Mouse down  
events are being processed twice due to a change in Morphic event handling.


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Comment #5 on issue 5662 by [hidden email]: One click on scroll bar  
scrolls two pages down
http://code.google.com/p/pharo/issues/detail?id=5662

Great find!


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