Hi Igor,
I like the fraction/offset model from SmalltalkMT. I once ported
it to Squeak. This gives you full control on absolute and relative
positioning within the bounds of the parent and controls resizing
behavior. Only 4 parameters for anything you need ...
Example:
self
addMorph: startButton
to: pane
offset: #(0 0 101 20)
fractions: #(0 0 0 0).
means the button starts top left at x1=0, y1=0 with the bottom
right corner at x2=101 and y2=20. There is no fraction given -
so we have absolute positioning.
If you give a fraction you tell the system that for instance
a subpane should always start at 30% from the side of a parents box.
-> relative positions with resizing.
If you additionally give an offset you can define that there is
an additional absolute margin after the 30%. With a negative offset you
can absolute position the control/submorph on the other side of the 30%
virtual line.
With fractions: #(0 0 1 1 ) which means 100% the control will fill
the parent and will fully resize with it.
Smalltalk MT used 1000 for 100% of the parents area, but thats
only a definition.
Have a look at the project "Sandcastle" on Squeaksource, especially
Sandcastle-tbn.9.mcz.
SCApplicationWindow (a subclass of SystemWindow here) provides a few
methods to support this dynamic layout and its subclass SCWelcomeWindow
shows how you can use it.
Hope this helps
Bye
T.
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