AbsoluteLayout respect negative fixed dimensions

[bytesandwich]

Absolute layout could interpret negative fixed dimensions as -x => (available - x) and it would allow us to have elements "docked" to the bottom of the screen like so:

                AbsoluteLayout.LayoutFlags="XProportional"
                AbsoluteLayout.LayoutBounds="0.5, -10, AutoSize, AutoSize"

Currently it's only possible to have a "docking" to the top of the screen.

One can work around this currently with margins, but it's just a neat feature to add.

This seems relatively do-able in AbsoluteLayoutmanager.ResolveDimension

[stephenquan]

I'm pretty sure this will work with

Absolute.LayoutFlags="PositionProportional"
AbsoluteLayout.LayoutBounds="0.5, 1.0, AutoSize, AutoSize"

Because AbsoluteLayout has this annoying feature of "clamping" the component to the visible bounds so that "0.5" may be the center X, but, "1.0" is never the center Y. Due to clamping "1.0", in practice becomes the bottom Y so your item is effectively docked to the bottom of the screen.

[bytesandwich]

I think I found the same thing about LayoutBound = "0,5, 1.0,. However, what if one wants to "dock" a view some fixed width away from the bottom of the screen? I'm not sure that is possible now without using a margin as a workaround.

A clarifying example could be the Mac main app toolbar with is 6px away from the absolute screen bottom.

Right now I believe a negative absolute will cause the view to appear partially above the top of the page:

<!-- Mac style docked bar settings
AbsoluteLayout.LayoutFlags="XProportional"
AbsoluteLayout.LayoutBounds="0.5, -6, AutoSize, AutoSize"

Do people use negative values for scrolling content out of the screen perhaps? I'm not sure what their utility is.