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docs: Add example of setting background color with ClutterEffect

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Add example of a simple background color effect applied via
pre_paint() implementation in a ClutterEffect subclass.

This is a simple effect with an incomplete GObject
implementation (no properties, setters or getters)
to make it as easy to follow as possible.
This commit is contained in:
Elliot Smith
2011-03-08 14:54:00 +00:00
parent a81dbcf483
commit 5732b1184f
4 changed files with 182 additions and 13 deletions
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37
doc/cookbook/examples/effects-basic.c
View File

@ -2,14 +2,15 @@
#include <clutter/clutter.h>
#include "cb-border-effect.h"
#include "cb-background-effect.h"
static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
static ClutterColor red_color = { 0xff, 0x00, 0x00, 0xff };
static gboolean
add_highlight (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
toggle_highlight (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
ClutterActorMeta *meta = CLUTTER_ACTOR_META (user_data);
@ -30,7 +31,9 @@ main (int argc,
ClutterActor *box;
ClutterLayoutManager *layout_manager;
ClutterActor *texture;
ClutterEffect *effect;
ClutterEffect *background_effect;
ClutterEffect *border_effect;
ClutterConstraint *width_constraint;
gchar *filename;
guint i;
GError *error = NULL;
@ -57,7 +60,10 @@ main (int argc,
10);
box = clutter_box_new (layout_manager);
clutter_actor_add_constraint (box, clutter_bind_constraint_new (stage, CLUTTER_BIND_WIDTH, 0.0));
width_constraint = clutter_bind_constraint_new (stage,
CLUTTER_BIND_WIDTH,
0.0);
clutter_actor_add_constraint (box, width_constraint);
/* loop through the files specified on the command line, adding
* each one into the box
@ -80,18 +86,25 @@ main (int argc,
filename,
error->message);
/* create a 5 pixel red border effect */
effect = cb_border_effect_new (5.0, &red_color);
/* create a grey background effect */
background_effect = cb_background_effect_new ();
/* add the effect to the actor, but disabled */
clutter_actor_add_effect (texture, effect);
clutter_actor_meta_set_enabled (CLUTTER_ACTOR_META (effect), FALSE);
/* apply the effect to the actor */
clutter_actor_add_effect (texture, background_effect);
/* create a 5 pixel red border effect */
border_effect = cb_border_effect_new (5.0, &red_color);
/* apply the effect to the actor, but disabled */
clutter_actor_add_effect (texture, border_effect);
clutter_actor_meta_set_enabled (CLUTTER_ACTOR_META (border_effect),
FALSE);
/* on mouse click, toggle the "enabled" property of the border effect */
g_signal_connect (texture,
"button-press-event",
G_CALLBACK (add_highlight),
effect);
G_CALLBACK (toggle_highlight),
border_effect);
clutter_container_add_actor (CLUTTER_CONTAINER (box), texture);
}