[PD-dev] much better scrolling algorithm (pd-extended 0.42.5)

[Hans-Christoph Steiner]

Ah, ok, just comparing now.  I added this pdtk_canvas-getscroll to Pd- 
extended 0.42.5-2009-11-12.  We currently have four to compare: Ico's,  
Pd, Pd-extended, and Pd-Gui-Rewrite.

- Pd-extended will correctly handle the scrollbars if you select some  
objects and move them with Shift-arrow, the other three do not (some  
better than others)

- when you select all and mouse drag components out of the current  
view, Pd-extended updates scrollbars immediately, Pd and Pd-devel  
update the scrollbars once you release the mouse, and Ico's gave me an  
error saying "Error: can't read "::scroll(.x6d5610)"

- when you resize the window, Pd-devel updates the scrollbars live, Pd- 
extended updates live with glitches, Pd updates on release, Ico's gave  
me an error saying "Error: can't read "::scroll(.x6d5610)"

.hc

On Nov 18, 2009, at 12:17 AM, Miller Puckette wrote:

> I think it's only in the e-mail:
>
> http://lists.puredata.info/pipermail/pd-dev/2009-10/014298.html
>
> On Wed, Nov 18, 2009 at 12:12:50AM -0500, Hans-Christoph Steiner  
> wrote:
>>
>> On Oct 31, 2009, at 9:41 PM, Ivica Ico Bukvic wrote:
>>
>>>
>>>> 3) 0 0 coordinate-centric design IMHO does not make sense. From
>>>> historical perspective, old patches should still TTBOMK open just
>>>> fine.
>>>> Yet, if 0 0 approach is still imposed, it results in unintuitive
>>>> behavior of scrollbars. e.g. try the following on 0.43 (or previous
>>>> versions without the suggested patch):
>>>>
>>>> create an object->create another object and slide it to the right
>>>> until
>>>> it goes outside the canvas area->a horizontal scrollbar will  
>>>> indicate
>>>> there is more stuff to the right->scroll to the right and at this
>>>> point
>>>> you may find both of your objects (effectively your whole patch)
>>>> within
>>>> the canvas, yet the scrollbar will suggest there is something to  
>>>> the
>>>> left when there isn't.
>>>
>>> After testing this a bit more, here's a small correction. My
>>> implementation does pack everything to the right or the left  
>>> depending
>>> upon where the whole canvas is located in respect to the 0 0 coord.
>>> This
>>> does not however affect older patches. That said, I still feel  
>>> this is
>>> more desirable and ultimately can be further adjusted as necessary.
>>>
>>> Best wishes,
>>>
>>> Ico
>>>
>>
>> I wanted to try this now that I have a moment, but I couldn't find  
>> the
>> patch. Did you add it to the patch tracker?
>>
>> .hc
>>
>>
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>>
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>>
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