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| -rw-r--r-- | doc/dw-out-of-flow.doc | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/doc/dw-out-of-flow.doc b/doc/dw-out-of-flow.doc index ceddba8d..9d8535ef 100644 --- a/doc/dw-out-of-flow.doc +++ b/doc/dw-out-of-flow.doc @@ -51,8 +51,34 @@ discussed in detail in the next section.) Implication for size calculations and allocation ================================================ +The size/position model of ::dw consists mainly of the following two +steps: + +1. First, the size of the toplevel widget is calculated. Size + calculation typically depends on the sizes of the widgets, which + are calculated recursively, but not more. +2. After this, the toplevel widget is allocated at position (0, 0), + with the preiosly calculated size. Each widget must allocate its + children, although the condition for the toplevel widget is not + necessary, but each widget may be allocated at every size. + +Especially for floats, this model becomes a bit difficult: + +**The size of a widget depends on the size not only of the children.** +In the example above, the last list item (green, following the +generating list item) must know the size of the the float, which is +not a child or, generally, descendant, but generally the sibling of an +anchestor. + ... +**The size of a widget depends on the allocation of another widget.** +In the example above, both list items (blue and green) must know the +position of the float widget. + +... + + Implementation overview ======================= |