docs: Add custom ClutterActor example which uses composition
This commit is contained in:
Elliot Smith
parent
b820e39406
commit
8a5967f0cc
@ -3,6 +3,7 @@ include $(top_srcdir)/build/autotools/Makefile.am.silent
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NULL =
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noinst_PROGRAMS = \
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actors-composite-main \
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animations-complex \
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animations-looping-animator \
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animations-looping-implicit \
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@ -62,6 +63,7 @@ AM_CFLAGS = \
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AM_LDFLAGS = $(CLUTTER_LIBS) -export-dynamic
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actors_composite_main_SOURCES = cb-button.c actors-composite-main.c
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animations_complex_SOURCES = animations-complex.c
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animations_looping_animator_SOURCES = animations-looping-animator.c
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animations_looping_implicit_SOURCES = animations-looping-implicit.c
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79
doc/cookbook/examples/actors-composite-main.c
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79
doc/cookbook/examples/actors-composite-main.c
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@ -0,0 +1,79 @@
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#include <stdlib.h>
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#include "cb-button.h"
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/* colors */
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static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
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static const ClutterColor white_color = { 0xff, 0xff, 0xff, 0xff };
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static const ClutterColor yellow_color = { 0x88, 0x88, 0x00, 0xff };
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/* click handler */
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static void
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clicked (CbButton *button,
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gpointer data)
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{
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const gchar *current_text;
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g_debug ("Clicked");
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current_text = cb_button_get_text (button);
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if (g_strcmp0 (current_text, "winkle") == 0)
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cb_button_set_text (button, "pickers");
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else
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cb_button_set_text (button, "winkle");
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}
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int
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main (int argc,
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char *argv[])
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{
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ClutterActor *stage;
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ClutterActor *button;
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ClutterConstraint *align_x_constraint;
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ClutterConstraint *align_y_constraint;
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clutter_init (&argc, &argv);
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stage = clutter_stage_get_default ();
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clutter_actor_set_size (stage, 400, 400);
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clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
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g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
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button = cb_button_new ();
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cb_button_set_text (CB_BUTTON (button), "winkle");
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/* the following is equivalent to the two lines above:
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*
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* button = g_object_new (CB_TYPE_BUTTON,
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* "text", "winkle",
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* NULL);
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*
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* because we defined a set_property function, which can accept
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* a PROP_TEXT parameter, GObject can create a button and set one
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* or more properties with a single call to g_object_new()
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*/
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cb_button_set_text_color (CB_BUTTON (button), &white_color);
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cb_button_set_background_color (CB_BUTTON (button), &yellow_color);
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clutter_actor_set_size (button, 200, 100);
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g_signal_connect (button, "clicked", G_CALLBACK (clicked), NULL);
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align_x_constraint = clutter_align_constraint_new (stage,
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CLUTTER_ALIGN_X_AXIS,
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0.5);
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align_y_constraint = clutter_align_constraint_new (stage,
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CLUTTER_ALIGN_Y_AXIS,
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0.5);
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clutter_actor_add_constraint (button, align_x_constraint);
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clutter_actor_add_constraint (button, align_y_constraint);
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clutter_container_add_actor (CLUTTER_CONTAINER (stage), button);
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clutter_actor_show (stage);
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clutter_main ();
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return EXIT_SUCCESS;
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}
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287
doc/cookbook/examples/cb-button.c
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287
doc/cookbook/examples/cb-button.c
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@ -0,0 +1,287 @@
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#include "cb-button.h"
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/*
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* convenience macro for GType implementations; see:
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* http://library.gnome.org/devel/gobject/2.27/gobject-Type-Information.html#G-DEFINE-TYPE:CAPS
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*/
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G_DEFINE_TYPE (CbButton, cb_button, CLUTTER_TYPE_ACTOR);
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/* macro for easy access to the private structure defined in this file */
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#define CB_BUTTON_GET_PRIVATE(obj) \
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(G_TYPE_INSTANCE_GET_PRIVATE ((obj), CB_TYPE_BUTTON, CbButtonPrivate))
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/* private structure */
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struct _CbButtonPrivate
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{
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ClutterActor *child;
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ClutterActor *label;
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ClutterAction *click_action;
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gchar *text;
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};
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/* enum for signals */
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enum
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{
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CLICKED,
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LAST_SIGNAL
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};
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/* enum for properties */
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enum
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{
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PROP_0,
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PROP_TEXT
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};
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/* signals */
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static guint cb_button_signals[LAST_SIGNAL] = { 0, };
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static void
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cb_button_dispose (GObject *gobject)
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{
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CbButtonPrivate *priv = CB_BUTTON (gobject)->priv;
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/* we just dispose of the child, and let its dispose()
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* function deal with its children
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*/
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if (priv->child)
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{
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clutter_actor_unparent (priv->child);
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priv->child = NULL;
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}
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G_OBJECT_CLASS (cb_button_parent_class)->dispose (gobject);
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}
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static void
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cb_button_finalize (GObject *gobject)
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{
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CbButtonPrivate *priv = CB_BUTTON (gobject)->priv;
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g_free (priv->text);
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G_OBJECT_CLASS (cb_button_parent_class)->finalize (gobject);
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}
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static void
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cb_button_set_property (GObject *gobject,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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CbButton *button = CB_BUTTON (gobject);
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switch (prop_id)
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{
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case PROP_TEXT:
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cb_button_set_text (button, g_value_get_string (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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break;
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}
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}
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static void
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cb_button_get_property (GObject *gobject,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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CbButtonPrivate *priv = CB_BUTTON (gobject)->priv;
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switch (prop_id)
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{
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case PROP_TEXT:
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g_value_set_string (value, priv->text);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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break;
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}
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}
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/* ClutterActor implementation */
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/* use the actor's allocation for the ClutterBox */
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static void
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cb_button_allocate (ClutterActor *actor,
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const ClutterActorBox *box,
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ClutterAllocationFlags flags)
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{
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CbButtonPrivate *priv = CB_BUTTON (actor)->priv;
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ClutterActorBox child_box = { 0, };
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/* set the allocation for the whole button */
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CLUTTER_ACTOR_CLASS (cb_button_parent_class)->allocate (actor, box, flags);
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/* make the child (the ClutterBox) fill the parent */
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child_box.x1 = 0.0;
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child_box.y1 = 0.0;
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child_box.x2 = clutter_actor_box_get_width (box);
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child_box.y2 = clutter_actor_box_get_height (box);
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clutter_actor_allocate (priv->child, &child_box, flags);
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}
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/* paint function implementation: just call paint() on the ClutterBox */
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static void
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cb_button_paint (ClutterActor *actor)
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{
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CbButtonPrivate *priv = CB_BUTTON (actor)->priv;
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clutter_actor_paint (priv->child);
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}
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/* proxy ClickAction signals so they become signals from the actor */
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static void
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cb_button_clicked (ClutterClickAction *action,
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ClutterActor *actor,
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gpointer user_data)
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{
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g_signal_emit (actor, cb_button_signals[CLICKED], 0);
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}
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/* GObject class and instance init */
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static void
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cb_button_class_init (CbButtonClass *klass)
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{
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ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GParamSpec *pspec;
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gobject_class->dispose = cb_button_dispose;
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gobject_class->finalize = cb_button_finalize;
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gobject_class->set_property = cb_button_set_property;
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gobject_class->get_property = cb_button_get_property;
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actor_class->allocate = cb_button_allocate;
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actor_class->paint = cb_button_paint;
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g_type_class_add_private (klass, sizeof (CbButtonPrivate));
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pspec = g_param_spec_string ("text",
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"Text",
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"Text of the button",
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NULL,
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G_PARAM_READWRITE);
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g_object_class_install_property (gobject_class, PROP_TEXT, pspec);
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cb_button_signals[CLICKED] =
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g_signal_new ("clicked",
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (CbButtonClass, clicked),
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NULL,
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NULL,
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g_cclosure_marshal_VOID__VOID,
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G_TYPE_NONE,
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0);
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}
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static void
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cb_button_init (CbButton *self)
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{
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CbButtonPrivate *priv;
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ClutterLayoutManager *layout;
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priv = self->priv = CB_BUTTON_GET_PRIVATE (self);
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clutter_actor_set_reactive (CLUTTER_ACTOR (self), TRUE);
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layout = clutter_bin_layout_new (CLUTTER_BIN_ALIGNMENT_CENTER,
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CLUTTER_BIN_ALIGNMENT_CENTER);
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priv->child = clutter_box_new (layout);
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/* set the parent of the ClutterBox to this instance */
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clutter_actor_set_parent (priv->child,
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CLUTTER_ACTOR (self));
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/* add text label to the button */
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priv->label = g_object_new (CLUTTER_TYPE_TEXT,
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"line-alignment", PANGO_ALIGN_CENTER,
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"ellipsize", PANGO_ELLIPSIZE_END,
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NULL);
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clutter_container_add_actor (CLUTTER_CONTAINER (priv->child),
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priv->label);
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/* add a ClutterClickAction on this actor, so we can proxy its
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* "clicked" signal through a signal from this actor
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*/
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priv->click_action = clutter_click_action_new ();
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clutter_actor_add_action (CLUTTER_ACTOR (self), priv->click_action);
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g_signal_connect (priv->click_action,
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"clicked",
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G_CALLBACK (cb_button_clicked),
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NULL);
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}
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/* public API */
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/* examples of public API functions which wrap functions
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* on internal actors
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*/
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void
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cb_button_set_text (CbButton *self,
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const gchar *text)
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{
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CbButtonPrivate *priv;
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/* public API should check its arguments;
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* see also g_return_val_if_fail for functions which
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* return a value
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*/
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g_return_if_fail (CB_IS_BUTTON (self));
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priv = self->priv;
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g_free (priv->text);
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if (text)
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priv->text = g_strdup (text);
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else
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priv->text = g_strdup ("");
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/* call the actual function on the ClutterText inside the layout */
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clutter_text_set_text (CLUTTER_TEXT (priv->label), priv->text);
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}
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void
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cb_button_set_background_color (CbButton *self,
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const ClutterColor *color)
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{
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g_return_if_fail (CB_IS_BUTTON (self));
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clutter_box_set_color (CLUTTER_BOX (self->priv->child), color);
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}
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void
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cb_button_set_text_color (CbButton *self,
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const ClutterColor *color)
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{
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g_return_if_fail (CB_IS_BUTTON (self));
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clutter_text_set_color (CLUTTER_TEXT (self->priv->label), color);
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}
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/* see http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#G-CONST-RETURN:CAPS
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* for an explanation of G_CONST_RETURN: basically it means that the
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* return value of this function should not be modified
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*/
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G_CONST_RETURN gchar *
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cb_button_get_text (CbButton *self)
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{
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g_return_val_if_fail (CB_IS_BUTTON (self), NULL);
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return self->priv->text;
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}
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ClutterActor *
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cb_button_new (void)
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{
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return g_object_new (CB_TYPE_BUTTON, NULL);
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}
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72
doc/cookbook/examples/cb-button.h
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72
doc/cookbook/examples/cb-button.h
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@ -0,0 +1,72 @@
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/* inclusion guard */
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#ifndef __CB_BUTTON_H__
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#define __CB_BUTTON_H__
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/* include any dependencies */
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#include <clutter/clutter.h>
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/* GObject implementation */
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/* declare this function signature to remove compilation errors with -Wall;
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* the cb_button_get_type() function is actually added via the
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* G_DEFINE_TYPE macro in the .c file
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*/
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GType cb_button_get_type (void);
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/* GObject type macros */
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#define CB_TYPE_BUTTON (cb_button_get_type ())
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#define CB_BUTTON(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CB_TYPE_BUTTON, CbButton))
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#define CB_IS_BUTTON(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CB_TYPE_BUTTON))
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#define CB_BUTTON_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CB_TYPE_BUTTON, CbButtonClass))
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#define CB_IS_BUTTON_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CB_TYPE_BUTTON))
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#define CB_BUTTON_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CB_TYPE_BUTTON, CbButtonClass))
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/*
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* Private instance fields; see
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* http://www.gotw.ca/gotw/024.htm for the rationalse
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*/
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typedef struct _CbButtonPrivate CbButtonPrivate;
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typedef struct _CbButton CbButton;
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typedef struct _CbButtonClass CbButtonClass;
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/* object structure */
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struct _CbButton
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{
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/*<private>*/
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ClutterActor parent_instance;
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/* structure containing private members */
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/*<private>*/
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CbButtonPrivate *priv;
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};
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/* class structure */
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struct _CbButtonClass
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{
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/* signals */
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void (* clicked) (CbButton *button);
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/*<private>*/
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ClutterActorClass parent_class;
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};
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/* public API */
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/* constructor - note this returns a ClutterActor instance */
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ClutterActor *cb_button_new (void);
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/* getter */
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G_CONST_RETURN gchar * cb_button_get_text (CbButton *self);
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/* setters - these are wrappers round functions
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* which change properties of the internal actors
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*/
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void cb_button_set_text (CbButton *self, const gchar *text);
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void cb_button_set_background_color (CbButton *self,
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const ClutterColor *color);
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void cb_button_set_text_color (CbButton *self,
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const ClutterColor *color);
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#endif /* __CB_BUTTON_H__ */
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