Re: [Adobe-source-devel] aspect ratios in Eve

[Sean P. <sp...@ad...>]

On Feb 2, 2007, at 4:28 PM, Ralph Thomas wrote:

> Hi List,
>
>   Is there a reasonable way to extend Eve such that a view can specify
> an aspect ratio that it must be placed at (if it was a video or
> picture, for example). I'm aware of the twopass layout, but that only
> solves the case where the ratio is wider than it is taller.

No - it simply biases the width first to the hight - you can use the  
same two passes to preserve the aspect ratio-

Think about it this way - given something that is 10 unites wide with  
an aspect ration of 1:2 how tall is it? What if the aspect ration is  
2:1 - now how tall?

>
>   Imagine that such a ratio constrained view is center aligned
> horizontally and filling vertically (and imagine that it's tiny, and
> being scaled up because it's filling vertically). The view won't know
> what width to return to Eve until it knows the height that's
> available.

Simply because you are asked to fill a space horizontally doesn't  
mean you need to use the space - you can place limits on the vertical  
calculation given the aspect ration and horizontal calculation - this  
may then adjust the actual width - and you'll have extra white space  
- but this is white space you would have anyway.

>
>   The only easy way I can think of "solving" this problem is by
> solving vertical layout first, adjusting horizontal and the solving
> horizontal layout when a layout has a view that's constrained like
> this. Clearly this breaks down when there are two views that not both
> constrained in the same way (and probably some platform's paragraph
> layout APIs won't give you width based on height, breaking word-wrap
> in labels). Is there another (reasonable) way to extend Eve to support
> views with fixed aspect ratios?
>
> Thanks!
>  Ralph
>
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