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mutter-performance-source/examples/constraints.c

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#include <stdlib.h>
#include <clutter/clutter.h>
int
main (int argc, char *argv[])
{
ClutterActor *stage, *layer_a, *layer_b, *layer_c;
if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
return 1;
/* the main container */
stage = clutter_stage_new ();
clutter_actor_set_name (stage, "stage");
clutter_stage_set_title (CLUTTER_STAGE (stage), "Snap Constraint");
clutter_actor_set_background_color (stage, CLUTTER_COLOR_Aluminium1);
clutter_stage_set_user_resizable (CLUTTER_STAGE (stage), TRUE);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
/* first layer, with a fixed (100, 25) size */
layer_a = clutter_actor_new ();
clutter_actor_set_background_color (layer_a, CLUTTER_COLOR_ScarletRed);
clutter_actor_set_name (layer_a, "layerA");
clutter_actor_set_size (layer_a, 100.0, 25.0);
clutter_actor_add_child (stage, layer_a);
/* the first layer is anchored to the middle of the stage */
clutter_actor_add_constraint (layer_a, clutter_align_constraint_new (stage, CLUTTER_ALIGN_BOTH, 0.5));
/* second layer, with no implicit size */
layer_b = clutter_actor_new ();
clutter_actor_set_background_color (layer_b, CLUTTER_COLOR_DarkButter);
clutter_actor_set_name (layer_b, "layerB");
clutter_actor_add_child (stage, layer_b);
/* the second layer tracks the X coordinate and the width of
* the first layer
*/
clutter_actor_add_constraint (layer_b, clutter_bind_constraint_new (layer_a, CLUTTER_BIND_X, 0.0));
clutter_actor_add_constraint (layer_b, clutter_bind_constraint_new (layer_a, CLUTTER_BIND_WIDTH, 0.0));
/* the second layer is snapped between the bottom edge of
* the first layer, and the bottom edge of the stage; a
* spacing of 10 pixels in each direction is added for padding
*/
clutter_actor_add_constraint (layer_b,
clutter_snap_constraint_new (layer_a,
CLUTTER_SNAP_EDGE_TOP,
CLUTTER_SNAP_EDGE_BOTTOM,
10.0));
clutter_actor_add_constraint (layer_b,
clutter_snap_constraint_new (stage,
CLUTTER_SNAP_EDGE_BOTTOM,
CLUTTER_SNAP_EDGE_BOTTOM,
-10.0));
/* the third layer, with no implicit size */
layer_c = clutter_actor_new ();
clutter_actor_set_background_color (layer_c, CLUTTER_COLOR_LightChameleon);
clutter_actor_set_name (layer_c, "layerC");
clutter_actor_add_child (stage, layer_c);
/* as for the second layer, the third layer tracks the X
* coordinate and width of the first layer
*/
clutter_actor_add_constraint (layer_c, clutter_bind_constraint_new (layer_a, CLUTTER_BIND_X, 0.0));
clutter_actor_add_constraint (layer_c, clutter_bind_constraint_new (layer_a, CLUTTER_BIND_WIDTH, 0.0));
/* the third layer is snapped between the top edge of the stage
* and the top edge of the first layer; again, a spacing of
* 10 pixels in each direction is added for padding
*/
clutter_actor_add_constraint (layer_c,
clutter_snap_constraint_new (layer_a,
CLUTTER_SNAP_EDGE_BOTTOM,
CLUTTER_SNAP_EDGE_TOP,
-10.0));
clutter_actor_add_constraint (layer_c,
clutter_snap_constraint_new (stage,
CLUTTER_SNAP_EDGE_TOP,
CLUTTER_SNAP_EDGE_TOP,
10.0));
clutter_actor_show (stage);
clutter_main ();
return EXIT_SUCCESS;
}