[Lazarus] Docking manager implementation

[Marc Weustink]

Micha Nelissen wrote:
> Reenen Laurie wrote:
>> For me, all I really want that's not supported via Lazarus at the moment 
>> is the % of parent statement...
>>
>> So
>> child1.top := 0%  (1%?)
>> child1.bottom := 33%
>> child2.top := 34%;
>> child2.bottom := 100%;
> 
> These kind of calculations are easy in the OnResize event of the parent. 
> A OnResize is also much more flexible, because you can keep some childs 
> fixed and others proportional etc. Also the in between child space is 
> preferred to be fixed e.g. 6 pixels or so. I think there are many 
> variations on the 'proportional theme' to be liked that they cannot be 
> put into a 'choose pull-down' property editor.

Or (as I recently discovered) you can set the align to alCustom and 
handle all your custon stuff in OnCustomAlignPosition / 
OnCustomAlignInsertBefore

Marc