/usr/share/clutter-1.0/cookbook/examples/layouts-bind-constraint-overlay.c is in libclutter-1.0-doc 1.20.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 | #include <stdlib.h>
#include <clutter/clutter.h>
#define STAGE_SIDE 400
#define RECTANGLE_SIDE STAGE_SIDE * 0.5
#define TEXTURE_SIZE_MAX STAGE_SIDE * 0.9
#define TEXTURE_SIZE_MIN STAGE_SIDE * 0.1
#define TEXTURE_SIZE_STEP 0.2
#define OVERLAY_OPACITY_OFF 0
#define OVERLAY_OPACITY_ON 100
static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
static const ClutterColor overlay_color = { 0xaa, 0x99, 0x00, 0xff };
/* change the texture size with +/- */
static gboolean
key_press_cb (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
ClutterActor *texture;
gfloat texture_width, texture_height;
guint key_pressed;
texture = CLUTTER_ACTOR (user_data);
clutter_actor_get_size (texture, &texture_width, &texture_height);
key_pressed = clutter_event_get_key_symbol (event);
if (key_pressed == CLUTTER_KEY_plus)
{
texture_width *= 1.0 + TEXTURE_SIZE_STEP;
texture_height *= 1.0 + TEXTURE_SIZE_STEP;
}
else if (key_pressed == CLUTTER_KEY_minus)
{
texture_width *= 1.0 - TEXTURE_SIZE_STEP;
texture_height *= 1.0 - TEXTURE_SIZE_STEP;
}
if (texture_width <= TEXTURE_SIZE_MAX && texture_width >= TEXTURE_SIZE_MIN)
clutter_actor_animate (texture, CLUTTER_EASE_OUT_CUBIC, 500,
"width", texture_width,
"height", texture_height,
NULL);
return TRUE;
}
/* turn overlay opacity on/off */
static void
click_cb (ClutterClickAction *action,
ClutterActor *actor,
gpointer user_data)
{
ClutterActor *overlay = CLUTTER_ACTOR (user_data);
guint8 opacity = clutter_actor_get_opacity (overlay);
if (opacity < OVERLAY_OPACITY_ON)
opacity = OVERLAY_OPACITY_ON;
else
opacity = OVERLAY_OPACITY_OFF;
clutter_actor_set_opacity (overlay, opacity);
}
int
main (int argc, char *argv[])
{
ClutterActor *stage;
ClutterActor *texture;
ClutterActor *overlay;
ClutterAction *click;
GError *error = NULL;
const gchar *filename = "redhand.png";
if (argc > 1)
filename = argv[1];
if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
return 1;
stage = clutter_stage_new ();
clutter_actor_set_size (stage, STAGE_SIDE, STAGE_SIDE);
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
texture = clutter_texture_new ();
clutter_texture_set_keep_aspect_ratio (CLUTTER_TEXTURE (texture), TRUE);
clutter_actor_set_reactive (texture, TRUE);
clutter_actor_set_size (texture, RECTANGLE_SIDE, RECTANGLE_SIDE);
clutter_actor_add_constraint (texture, clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0.5));
clutter_actor_add_constraint (texture, clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.5));
clutter_texture_set_from_file (CLUTTER_TEXTURE (texture),
filename,
&error);
if (error != NULL)
{
g_warning ("Error loading %s\n%s", filename, error->message);
g_error_free (error);
exit (EXIT_FAILURE);
}
/* overlay is 10px wider and taller than the texture, and centered on it;
* initially, it is transparent; but it is made semi-opaque when the
* texture is clicked
*/
overlay = clutter_rectangle_new_with_color (&overlay_color);
clutter_actor_set_opacity (overlay, OVERLAY_OPACITY_OFF);
clutter_actor_add_constraint (overlay, clutter_bind_constraint_new (texture, CLUTTER_BIND_WIDTH, 10));
clutter_actor_add_constraint (overlay, clutter_bind_constraint_new (texture, CLUTTER_BIND_HEIGHT, 10));
clutter_actor_add_constraint (overlay, clutter_align_constraint_new (texture, CLUTTER_ALIGN_X_AXIS, 0.5));
clutter_actor_add_constraint (overlay, clutter_align_constraint_new (texture, CLUTTER_ALIGN_Y_AXIS, 0.5));
click = clutter_click_action_new ();
clutter_actor_add_action (texture, click);
clutter_container_add (CLUTTER_CONTAINER (stage), texture, overlay, NULL);
clutter_actor_raise_top (overlay);
g_signal_connect (click, "clicked", G_CALLBACK (click_cb), overlay);
g_signal_connect (stage,
"key-press-event",
G_CALLBACK (key_press_cb),
texture);
clutter_actor_show (stage);
clutter_main ();
return EXIT_SUCCESS;
}
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