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align-constraint: Follow the position of the source

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The AlignConstraint update is using only the width/height of the source,
but it should also take into account the position.

Also, instead of using the ::notify signal, it should follow the
BindConstraint, and switch to the ::allocation-changed signal, since
it's less expensive (one emission instead of four notifications, one for
each property we use).
This commit is contained in:
Emmanuele Bassi 2010-07-01 14:09:37 +01:00
parent b625d94362
commit daf19205e0
1 changed files with 17 additions and 13 deletions
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28
clutter/clutter-align-constraint.c
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@ -83,8 +83,13 @@ update_actor_position (ClutterAlignConstraint *align)
{
gfloat source_width, source_height;
gfloat actor_width, actor_height;
gfloat source_x, source_y;
gfloat new_position;
ClutterActor *actor;
if (align->source == NULL)
return;
if (!clutter_actor_meta_get_enabled (CLUTTER_ACTOR_META (align)))
return;
@ -92,35 +97,34 @@ update_actor_position (ClutterAlignConstraint *align)
if (actor == NULL)
return;
if (align->source == NULL)
return;
clutter_actor_get_position (align->source, &source_x, &source_y);
clutter_actor_get_size (align->source, &source_width, &source_height);
clutter_actor_get_size (actor, &actor_width, &actor_height);
switch (align->align_axis)
{
case CLUTTER_ALIGN_X_AXIS:
clutter_actor_set_x (actor, (source_width - actor_width) * align->factor);
new_position = ((source_width - actor_width) + source_x)
* align->factor;
clutter_actor_set_x (actor, new_position);
break;
case CLUTTER_ALIGN_Y_AXIS:
clutter_actor_set_y (actor, (source_height - actor_height) * align->factor);
new_position = ((source_height - actor_height) + source_y)
* align->factor;
clutter_actor_set_y (actor, new_position);
break;
}
}
static void
source_position_changed (GObject *gobject,
GParamSpec *pspec,
source_position_changed (ClutterActor *actor,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags,
ClutterAlignConstraint *align)
{
if (strcmp (pspec->name, "width") == 0 ||
strcmp (pspec->name, "height") == 0)
{
update_actor_position (align);
}
}
static void
source_destroyed (ClutterActor *actor,
@ -320,7 +324,7 @@ clutter_align_constraint_set_source (ClutterAlignConstraint *align,
if (align->source != NULL)
{
g_signal_connect (align->source, "notify",
g_signal_connect (align->source, "allocation-changed",
G_CALLBACK (source_position_changed),
align);
g_signal_connect (align->source, "destroy",