Zitat von Alexander Klenin <[email protected]>:
On Wed, Apr 7, 2010 at 22:47, Michael Van Canneyt
<[email protected]> wrote:
I agree for Constraints, but not the other two.
Funny, I just argued exactly the other way around ;-)
Some properties must be handled by all Layouters. For example the
interface constraints (you can not resize a combobox free under
windows and a scrollbar not under gtk).
The other constraint properties makes sense in all layouters too, so I
recommend to use them (not reinventing the wheel). They are also
applied in all LCL code. If a layouter does not like them, I recommend
that it clears the constraints instead of ignoring them.
Borderspacing properties could be used too in all layouts (I can
imagine) and for consistency I recommend that they are used - at least
- in a similar way. This is more a design guide line.
AnchorSides are only for fixed and Align controls. This is special to
the default LCL layouter. The same for ChildSizing.
I have trouble to find the direction of this thread, so I will repeat
my proposal:
Every TControl gets a property "Layouter: TLControlLayouter".
TLControlLayouter gets a bunch of methods. The most important ones are
CalculatePreferredSize and AlignControls. CalculatePreferredSize
computes the preferred size, which the parent layouter can use.
AlignControls resizes/positions the child controls according to the
current bounds. If Layouter=nil then the default layouter will be used.
Mattias
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