c3cbf1533f
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.
70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
#include <stdlib.h>
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#include <clutter/clutter.h>
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#define OVERLAY_FACTOR 1.1
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static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
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static const ClutterColor red = { 0xff, 0x00, 0x00, 0xff };
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static const ClutterColor blue = { 0x00, 0x00, 0xff, 0x66 };
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void
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allocation_changed_cb (ClutterActor *actor,
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const ClutterActorBox *allocation,
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ClutterAllocationFlags flags,
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gpointer user_data)
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{
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ClutterActor *overlay = CLUTTER_ACTOR (user_data);
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gfloat width, height, x, y;
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clutter_actor_box_get_size (allocation, &width, &height);
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clutter_actor_box_get_origin (allocation, &x, &y);
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clutter_actor_set_size (overlay,
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width * OVERLAY_FACTOR,
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height * OVERLAY_FACTOR);
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clutter_actor_set_position (overlay,
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x - ((OVERLAY_FACTOR - 1) * width * 0.5),
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y - ((OVERLAY_FACTOR - 1) * width * 0.5));
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}
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int
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main (int argc, char *argv[])
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{
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ClutterActor *stage;
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ClutterActor *actor;
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ClutterActor *overlay;
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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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actor = clutter_rectangle_new_with_color (&red);
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clutter_actor_set_size (actor, 100, 100);
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clutter_actor_set_position (actor, 150, 150);
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overlay = clutter_rectangle_new_with_color (&blue);
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g_signal_connect (actor,
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"allocation-changed",
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G_CALLBACK (allocation_changed_cb),
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overlay);
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clutter_container_add (CLUTTER_CONTAINER (stage), actor, overlay, NULL);
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clutter_actor_animate (actor, CLUTTER_LINEAR, 2000,
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"width", 300.0,
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"height", 300.0,
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"x", 50.0,
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"y", 50.0,
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NULL);
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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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