Re: [boost] Re: [gui] rectangles and the CSS box model

From: Mathew Robertson (mathew.robertson_at_[hidden])
Date: 2004-12-22 17:44:55

> >     Actually, now that I think about it, the css box is going to
> >     cost a lot if it has actual structures. It is going to need a to
> >     return a margin, say by inspecting the margin it was assigned,
> >     and if assigned none, return the margin that it inherited. 
> 
> There is no reason why it is not possible to implement a simplified box 
> model specifically for GUI layouts. The width/height can be calculated 
> using get_minimum_size() and area.deflate( margin + padding ). Border is 
> not really necessary. As for inheriting, for simplicity, the box model 
> will not inherit anything.

Layout managers work this way...

Layout managment is a capability of a window.  When a window becomes a parent window (eg: you have added some butotns to it), the parent window will do the following:
1. It asks each child their minimum size
2. It tallies the minimum size needed by all children.
3. If the parent has the property that it is to use a minimum size, then it will call setSize() to be the size of the tallied size of the children.  If it is to be smaller/larger, then it will adjust the tallied value to the specified size.
4. Each child is then told to setSize() to a specific size, which is based on the value of the tally and an appropriate algorithm (of say, equal width per child).

Mathew