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cookbook: Example using allocation-changed to sync actor size

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An alternative method (not using constraints) to bind
one actor's size and position to another. Used as
an example in the recipe about resizing one actor in
sync with a source actor.
This commit is contained in:
Elliot Smith 2010-09-16 13:42:09 +01:00
parent 8a149521ce
commit c3cbf1533f
2 changed files with 72 additions and 0 deletions
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2
doc/cookbook/examples/Makefile.am
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@ -10,6 +10,7 @@ noinst_PROGRAMS = \
textures-reflection \
textures-split-go \
textures-sub-texture \
layouts-bind-constraint-allocation \
layouts-bind-constraint-overlay \
layouts-bind-constraint-stage \
layouts-stacking \
@ -54,6 +55,7 @@ text_shadow_SOURCES = text-shadow.c
textures_reflection_SOURCES = textures-reflection.c
textures_split_go_SOURCES = textures-split-go.c
textures_sub_texture_SOURCES = textures-sub-texture.c
layouts_bind_constraint_allocation_SOURCES = layouts-bind-constraint-allocation.c
layouts_bind_constraint_overlay_SOURCES = layouts-bind-constraint-overlay.c
layouts_bind_constraint_stage_SOURCES = layouts-bind-constraint-stage.c
layouts_stacking_SOURCES = layouts-stacking.c

70
doc/cookbook/examples/layouts-bind-constraint-allocation.c Normal file
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@ -0,0 +1,70 @@
#include <stdlib.h>
#include <clutter/clutter.h>
#define OVERLAY_FACTOR 1.1
static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
static const ClutterColor red = { 0xff, 0x00, 0x00, 0xff };
static const ClutterColor blue = { 0x00, 0x00, 0xff, 0x66 };
void
allocation_changed_cb (ClutterActor *actor,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags,
gpointer user_data)
{
ClutterActor *overlay = CLUTTER_ACTOR (user_data);
gfloat width, height, x, y;
clutter_actor_box_get_size (allocation, &width, &height);
clutter_actor_box_get_origin (allocation, &x, &y);
clutter_actor_set_size (overlay,
width * OVERLAY_FACTOR,
height * OVERLAY_FACTOR);
clutter_actor_set_position (overlay,
x - ((OVERLAY_FACTOR - 1) * width * 0.5),
y - ((OVERLAY_FACTOR - 1) * width * 0.5));
}
int
main (int argc, char *argv[])
{
ClutterActor *stage;
ClutterActor *actor;
ClutterActor *overlay;
clutter_init (&argc, &argv);
stage = clutter_stage_get_default ();
clutter_actor_set_size (stage, 400, 400);
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
actor = clutter_rectangle_new_with_color (&red);
clutter_actor_set_size (actor, 100, 100);
clutter_actor_set_position (actor, 150, 150);
overlay = clutter_rectangle_new_with_color (&blue);
g_signal_connect (actor,
"allocation-changed",
G_CALLBACK (allocation_changed_cb),
overlay);
clutter_container_add (CLUTTER_CONTAINER (stage), actor, overlay, NULL);
clutter_actor_animate (actor, CLUTTER_LINEAR, 2000,
"width", 300.0,
"height", 300.0,
"x", 50.0,
"y", 50.0,
NULL);
clutter_actor_show (stage);
clutter_main ();
return EXIT_SUCCESS;
}