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docs: Add more comments on how allocate() works

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Add some extra description to the allocate() function,
explaining how the allocation has to be adjusted to
coordinates relative to the actor as a whole, before
applying to the single child actor it is composed from.
This commit is contained in:
Elliot Smith 2011-01-28 16:43:22 +00:00
parent 00deb59a9d
commit 6934b36451
1 changed files with 8 additions and 1 deletions
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9
doc/cookbook/examples/cb-button.c
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@ -162,7 +162,14 @@ cb_button_allocate (ClutterActor *actor,
/* set the allocation for the whole button */ /* set the allocation for the whole button */
CLUTTER_ACTOR_CLASS (cb_button_parent_class)->allocate (actor, box, flags); CLUTTER_ACTOR_CLASS (cb_button_parent_class)->allocate (actor, box, flags);
/* make the child (the ClutterBox) fill the parent */ /* make the child (the ClutterBox) fill the parent;
* note that this allocation box is relative to the
* coordinates of the whole button actor, so we can't just
* use the box passed into this function; instead, it
* is adjusted to span the whole of the actor, from its
* top-left corner (0,0) to its bottom-right corner
* (width,height)
*/
child_box.x1 = 0.0; child_box.x1 = 0.0;
child_box.y1 = 0.0; child_box.y1 = 0.0;
child_box.x2 = clutter_actor_box_get_width (box); child_box.x2 = clutter_actor_box_get_width (box);