mutter/doc/cookbook/examples/effects-basic.c
Elliot Smith a81dbcf483 docs: Add example of a border added through ClutterEffect
Add a basic example showing how to implement a ClutterEffect
post_paint() function to overlay a highlight border over a
rectangular actor.
2011-03-17 15:56:55 +00:00

107 lines
3.1 KiB
C

#include <stdlib.h>
#include <clutter/clutter.h>
#include "cb-border-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)
{
ClutterActorMeta *meta = CLUTTER_ACTOR_META (user_data);
gboolean effect_enabled = clutter_actor_meta_get_enabled (meta);
clutter_actor_meta_set_enabled (meta, !effect_enabled);
clutter_actor_queue_redraw (actor);
return TRUE;
}
int
main (int argc,
char *argv[])
{
ClutterActor *stage;
ClutterActor *box;
ClutterLayoutManager *layout_manager;
ClutterActor *texture;
ClutterEffect *effect;
gchar *filename;
guint i;
GError *error = NULL;
if (argc < 2)
{
g_print ("Usage: %s <image files>\n", argv[0]);
return EXIT_FAILURE;
}
if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
return EXIT_FAILURE;
stage = clutter_stage_new ();
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
clutter_stage_set_user_resizable (CLUTTER_STAGE (stage), TRUE);
clutter_actor_set_size (stage, 600, 400);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
layout_manager = clutter_flow_layout_new (CLUTTER_FLOW_HORIZONTAL);
clutter_flow_layout_set_column_spacing (CLUTTER_FLOW_LAYOUT (layout_manager),
10);
clutter_flow_layout_set_row_spacing (CLUTTER_FLOW_LAYOUT (layout_manager),
10);
box = clutter_box_new (layout_manager);
clutter_actor_add_constraint (box, clutter_bind_constraint_new (stage, CLUTTER_BIND_WIDTH, 0.0));
/* loop through the files specified on the command line, adding
* each one into the box
*/
for (i = 1; i < argc; i++)
{
filename = argv[i];
texture = clutter_texture_new ();
clutter_texture_set_keep_aspect_ratio (CLUTTER_TEXTURE (texture), TRUE);
clutter_actor_set_width (texture, 150);
clutter_actor_set_reactive (texture, TRUE);
clutter_texture_set_from_file (CLUTTER_TEXTURE (texture),
filename,
&error);
if (error != NULL)
g_warning ("Error loading file %s:\n%s",
filename,
error->message);
/* create a 5 pixel red border effect */
effect = cb_border_effect_new (5.0, &red_color);
/* add the effect to the actor, but disabled */
clutter_actor_add_effect (texture, effect);
clutter_actor_meta_set_enabled (CLUTTER_ACTOR_META (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);
clutter_container_add_actor (CLUTTER_CONTAINER (box), texture);
}
clutter_container_add_actor (CLUTTER_CONTAINER (stage), box);
clutter_actor_show (stage);
clutter_main ();
return EXIT_SUCCESS;
}