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2008-06-23 Emmanuele Bassi <ebassi@openedhand.com>

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* clutter/subclassing-ClutterActor.sgml: Remove mention of the
	get_paint_area() function and virtual function.
This commit is contained in:
Emmanuele Bassi 2008-06-23 15:56:30 +00:00
parent 9006de848b
commit 6fa156ad0f
2 changed files with 8 additions and 89 deletions
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5
doc/reference/ChangeLog
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@ -1,3 +1,8 @@
2008-06-23 Emmanuele Bassi <ebassi@openedhand.com>
* clutter/subclassing-ClutterActor.sgml: Remove mention of the
get_paint_area() function and virtual function.
2008-06-23 Øyvind Kolås <pippin@o-hand.com>
* clutter/subclassing-ClutterActor.sgml: added missing call to

92
doc/reference/clutter/subclassing-ClutterActor.sgml
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@ -320,90 +320,8 @@ foo_actor_allocate (ClutterActor *actor,
</programlisting>
</example>
<para>An actor should always paint inside its allocation. It is,
however, possible to paint outside the negotiated size by overriding
the <classname>ClutterActor</classname>::get_paint_area() virtual
function and setting the passed #ClutterActorBox with their
<emphasis>untransformed</emphasis> paint area. This allows writing
actors that can effectively paint on an area different in size and
position from the allocation area.</para>
<para>The <classname>ClutterActor</classname>::get_paint_area() method of
a #ClutterActor is internally invoked when clutter_actor_get_paint_area()
is called on an instance of that actor class. The get_paint_area()
virtual function must return the untransformed area used by the
actor to paint itself; clutter_actor_get_paint_area() will then
proceed to transform the area coordinates into the frame of reference
of the actor's parent (taking into account anchor point, scaling
and rotation).</para>
<note><para>The default paint area is the allocation area of the
actor.</para></note>
<example id="container-actor-paint-area-example">
<title>Implementation of get_paint_area()</title>
<para>In this example, <classname>FooActor</classname> implements
the get_paint_area() virtual function to return an area equivalent
to those of its children plus a border which is not taken into
account by the size negotiation process.</para>
<programlisting>
static void
foo_actor_get_paint_area (ClutterActor *actor,
ClutterActorBox *box)
{
FooActor *foo_actor = FOO_ACTOR (actor);
if (!foo_actor-&gt;children)
{
/* if we don't have any children we return the
* allocation given to us
*/
clutter_actor_get_allocation_box (actor, box);
}
else
{
ClutterActorBox all_box = { 0, };
GList *l;
/* our paint area is the union of the children
* paint areas, plus a border
*/
for (l = foo_actor-&gt;children; l != NULL; l = l&gt;next)
{
ClutterActor *child = l-&gt;data;
ClutterActorBox child_box = { 0, };
clutter_actor_get_paint_area (child, &amp;child_box);
if (l == foo_actor-&gt;children)
all_box = child_box;
else
{
if (child_box.x1 &lt; all_box.x1)
all_box.x1 = child_box.x1;
if (child_box.y1 &lt; all_box.y1)
all_box.y1 = child_box.y1;
if (child_box.x2 &lt; all_box.x2)
all_box.x2 = child_box.x2;
if (child_box.y2 &lt; all_box.y2)
all_box.y2 = child_box.y2;
}
}
/* apply the border width around the box */
all_box.x1 -= (foo_actor-&gt;border_width / 2);
all_box.y1 -= (foo_actor-&gt;border_width / 2);
all_box.x2 += (foo_actor-&gt;border_width / 2);
all_box.y2 += (foo_actor-&gt;border_width / 2);
*box = all_box;
}
}
</programlisting>
</example>
<para>The allocation is also the "paint area", that is the area where
the paint operations should be performed.</para>
</refsect1> <!-- actor-size-allocation -->
@ -512,10 +430,6 @@ foo_actor_paint (ClutterActor *actor)
</programlisting>
</example>
<note><para>A container imposing a layout on its children may
opt to use the paint area as returned by clutter_actor_get_paint_area()
instead of the allocation.</para></note>
<para>If the actor has a non-rectangular shape, or it has internal
children that need to be distinguished by the events delivery mechanism,
the <classname>ClutterActor</classname>::pick() method should also be
@ -527,7 +441,7 @@ foo_actor_paint (ClutterActor *actor)
<para>In this example, <classname>FooActor</classname> overrides the
pick() virtual function default implementation to paint itself with a
shaped silhouette, to allow events only on the actual shape of the actor
instead of the paint area.</para>
instead of the whole paint area.</para>
<programlisting>
static void
foo_actor_pick (ClutterActor *actor,