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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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6
doc/cookbook/examples/Makefile.am
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@ -84,7 +84,11 @@ animations_reuse_SOURCES = animations-reuse.c
animations_rotating_SOURCES = animations-rotating.c
animations_scaling_SOURCES = animations-scaling.c
animations_scaling_zoom_SOURCES = animations-scaling-zoom.c
effects_basic_SOURCES = cb-border-effect.c cb-border-effect.h effects-basic.c
effects_basic_SOURCES = cb-border-effect.c \
cb-border-effect.h \
cb-background-effect.c \
cb-background-effect.h \
effects-basic.c
effects_built_in_SOURCES = effects-built-in.c
effects_custom_deform_SOURCES = cb-page-fold-effect.c cb-page-fold-effect.h effects-custom-deform.c
text_shadow_SOURCES = text-shadow.c

110
doc/cookbook/examples/cb-background-effect.c Normal file
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@ -0,0 +1,110 @@
#include "cb-background-effect.h"
G_DEFINE_TYPE (CbBackgroundEffect, cb_background_effect, CLUTTER_TYPE_EFFECT);
#define CB_BACKGROUND_EFFECT_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
CB_TYPE_BACKGROUND_EFFECT, \
CbBackgroundEffectPrivate))
struct _CbBackgroundEffectPrivate
{
CoglMaterial *background;
CoglColor *color;
};
/* ClutterEffect implementation */
/* note that if pre_paint() returns FALSE
* any post_paint() defined for the effect will not be called
*/
static gboolean
cb_background_effect_pre_paint (ClutterEffect *self)
{
ClutterActor *actor;
gfloat width;
gfloat height;
CbBackgroundEffectPrivate *priv;
ClutterActorMeta *meta = CLUTTER_ACTOR_META (self);
/* check that the effect is enabled before applying it */
if (!clutter_actor_meta_get_enabled (meta))
return TRUE;
priv = CB_BACKGROUND_EFFECT (self)->priv;
/* get the associated actor's dimensions */
actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (self));
clutter_actor_get_size (actor, &width, &height);
/* draw a grey Cogl rectangle in the background */
cogl_set_source (priv->background);
cogl_rectangle (0, 0, width, height);
return TRUE;
}
/* GObject implementation */
static void
cb_background_effect_dispose (GObject *gobject)
{
CbBackgroundEffectPrivate *priv = CB_BACKGROUND_EFFECT (gobject)->priv;
if (priv->background != COGL_INVALID_HANDLE)
{
cogl_handle_unref (priv->background);
priv->background = COGL_INVALID_HANDLE;
}
if (priv->color != NULL)
{
cogl_color_free (priv->color);
priv->color = NULL;
}
G_OBJECT_CLASS (cb_background_effect_parent_class)->dispose (gobject);
}
static void
cb_background_effect_class_init (CbBackgroundEffectClass *klass)
{
ClutterEffectClass *effect_class = CLUTTER_EFFECT_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
effect_class->pre_paint = cb_background_effect_pre_paint;
gobject_class->dispose = cb_background_effect_dispose;
g_type_class_add_private (klass, sizeof (CbBackgroundEffectPrivate));
}
static void
cb_background_effect_init (CbBackgroundEffect *self)
{
CbBackgroundEffectPrivate *priv;
priv = self->priv = CB_BACKGROUND_EFFECT_GET_PRIVATE (self);
priv->background = cogl_material_new ();
/* grey color for filling the background material */
priv->color = cogl_color_new ();
cogl_color_init_from_4ub (priv->color, 122, 122, 122, 255);
cogl_material_set_color (priv->background, priv->color);
}
/* public API */
/**
* cb_background_effect_new:
*
* Creates a new #ClutterEffect which adds a grey background
* when applied to a rectangular actor.
*/
ClutterEffect *
cb_background_effect_new ()
{
return g_object_new (CB_TYPE_BACKGROUND_EFFECT,
NULL);
}

42
doc/cookbook/examples/cb-background-effect.h Normal file
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@ -0,0 +1,42 @@
#ifndef __CB_BACKGROUND_EFFECT_H__
#define __CB_BACKGROUND_EFFECT_H__
#include <clutter/clutter.h>
GType cb_background_effect_get_type (void);
#define CB_TYPE_BACKGROUND_EFFECT (cb_background_effect_get_type ())
#define CB_BACKGROUND_EFFECT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
CB_TYPE_BACKGROUND_EFFECT, \
CbBackgroundEffect))
#define CB_IS_BACKGROUND_EFFECT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
CB_TYPE_BACKGROUND_EFFECT))
#define CB_BACKGROUND_EFFECT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), \
CB_TYPE_BACKGROUND_EFFECT, \
CbBackgroundEffectClass))
#define CB_IS_BACKGROUND_EFFECT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), \
CB_TYPE_BACKGROUND_EFFECT))
#define CB_BACKGROUND_EFFECT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), \
CB_TYPE_BACKGROUND_EFFECT, \
CbBackgroundEffectClass))
typedef struct _CbBackgroundEffectPrivate CbBackgroundEffectPrivate;
typedef struct _CbBackgroundEffect CbBackgroundEffect;
typedef struct _CbBackgroundEffectClass CbBackgroundEffectClass;
/* object */
struct _CbBackgroundEffect
{
ClutterEffect parent_instance;
CbBackgroundEffectPrivate *priv;
};
/* class */
struct _CbBackgroundEffectClass
{
ClutterEffectClass parent_class;
};
ClutterEffect *cb_background_effect_new ();
#endif /* __CB_BACKGROUND_EFFECT_H__ */

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);
}