incremental
Factor handbook » UI framework » Building user interfaces » Gadget hierarchy and layouts » Incremental layouts

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<incremental> ( -- incremental )

Vocabulary
ui.gadgets.incremental

Class description
Incremental layout gadgets inherit from pack and implement an optimization where the relayout operation after adding a child to be done in constant time.

Incremental layout gadgets are created by calling <incremental>.

Children are managed with the add-incremental and clear-incremental words.

An example of an incremental is the 'output' of a 'pane' gadget.

Not every pack can use incremental layout, since incremental layout does not support non-default values for the align, fill, and gap slots.

Definition

USING: ui.gadgets.packs ;

IN: ui.gadgets.incremental

TUPLE: incremental < pack cursor ;

Methods

USING: kernel ui.gadgets.incremental ui.gadgets.private ;

M: incremental dim-changed drop ;


USING: accessors generic kernel ui.gadgets
ui.gadgets.incremental ;

M: incremental pref-dim*
    dup layout-state>>
    [ dup M\ incremental pref-dim* (call-next-method) >>cursor ]
    when cursor>> ;