mutter/clutter/examples/drop-action.c
2016-04-12 20:04:26 +02:00

264 lines
8.5 KiB
C

#include <stdlib.h>
#include <clutter/clutter.h>
#define TARGET_SIZE 200
#define HANDLE_SIZE 128
static ClutterActor *stage = NULL;
static ClutterActor *target1 = NULL;
static ClutterActor *target2 = NULL;
static ClutterActor *drag = NULL;
static gboolean drop_successful = FALSE;
static void add_drag_object (ClutterActor *target);
static void
on_drag_end (ClutterDragAction *action,
ClutterActor *actor,
gfloat event_x,
gfloat event_y,
ClutterModifierType modifiers)
{
ClutterActor *handle = clutter_drag_action_get_drag_handle (action);
g_print ("Drag ended at: %.0f, %.0f\n",
event_x, event_y);
clutter_actor_save_easing_state (actor);
clutter_actor_set_easing_mode (actor, CLUTTER_LINEAR);
clutter_actor_set_opacity (actor, 255);
clutter_actor_restore_easing_state (actor);
clutter_actor_save_easing_state (handle);
if (!drop_successful)
{
ClutterActor *parent = clutter_actor_get_parent (actor);
gfloat x_pos, y_pos;
clutter_actor_save_easing_state (parent);
clutter_actor_set_easing_mode (parent, CLUTTER_LINEAR);
clutter_actor_set_opacity (parent, 255);
clutter_actor_restore_easing_state (parent);
clutter_actor_get_transformed_position (actor, &x_pos, &y_pos);
clutter_actor_set_easing_mode (handle, CLUTTER_EASE_OUT_BOUNCE);
clutter_actor_set_position (handle, x_pos, y_pos);
clutter_actor_set_opacity (handle, 0);
}
else
{
clutter_actor_set_easing_mode (handle, CLUTTER_LINEAR);
clutter_actor_set_opacity (handle, 0);
}
clutter_actor_restore_easing_state (handle);
g_signal_connect (handle, "transitions-completed",
G_CALLBACK (clutter_actor_destroy),
NULL);
}
static void
on_drag_begin (ClutterDragAction *action,
ClutterActor *actor,
gfloat event_x,
gfloat event_y,
ClutterModifierType modifiers)
{
ClutterActor *handle;
gfloat x_pos, y_pos;
clutter_actor_get_position (actor, &x_pos, &y_pos);
handle = clutter_actor_new ();
clutter_actor_set_background_color (handle, CLUTTER_COLOR_DarkSkyBlue);
clutter_actor_set_size (handle, 128, 128);
clutter_actor_set_position (handle, event_x - x_pos, event_y - y_pos);
clutter_actor_add_child (stage, handle);
clutter_drag_action_set_drag_handle (action, handle);
clutter_actor_save_easing_state (actor);
clutter_actor_set_easing_mode (actor, CLUTTER_LINEAR);
clutter_actor_set_opacity (actor, 128);
clutter_actor_restore_easing_state (actor);
drop_successful = FALSE;
}
static void
add_drag_object (ClutterActor *target)
{
ClutterActor *parent;
if (drag == NULL)
{
ClutterAction *action;
drag = clutter_actor_new ();
clutter_actor_set_background_color (drag, CLUTTER_COLOR_LightSkyBlue);
clutter_actor_set_size (drag, HANDLE_SIZE, HANDLE_SIZE);
clutter_actor_set_position (drag,
(TARGET_SIZE - HANDLE_SIZE) / 2.0,
(TARGET_SIZE - HANDLE_SIZE) / 2.0);
clutter_actor_set_reactive (drag, TRUE);
action = clutter_drag_action_new ();
g_signal_connect (action, "drag-begin", G_CALLBACK (on_drag_begin), NULL);
g_signal_connect (action, "drag-end", G_CALLBACK (on_drag_end), NULL);
clutter_actor_add_action (drag, action);
}
parent = clutter_actor_get_parent (drag);
if (parent == target)
{
clutter_actor_save_easing_state (target);
clutter_actor_set_easing_mode (target, CLUTTER_LINEAR);
clutter_actor_set_opacity (target, 255);
clutter_actor_restore_easing_state (target);
return;
}
g_object_ref (drag);
if (parent != NULL && parent != stage)
{
clutter_actor_remove_child (parent, drag);
clutter_actor_save_easing_state (parent);
clutter_actor_set_easing_mode (parent, CLUTTER_LINEAR);
clutter_actor_set_opacity (parent, 64);
clutter_actor_restore_easing_state (parent);
}
clutter_actor_add_child (target, drag);
clutter_actor_save_easing_state (target);
clutter_actor_set_easing_mode (target, CLUTTER_LINEAR);
clutter_actor_set_opacity (target, 255);
clutter_actor_restore_easing_state (target);
g_object_unref (drag);
}
static void
on_target_over (ClutterDropAction *action,
ClutterActor *actor,
gpointer _data)
{
gboolean is_over = GPOINTER_TO_UINT (_data);
guint8 final_opacity = is_over ? 128 : 64;
ClutterActor *target;
target = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (action));
clutter_actor_save_easing_state (target);
clutter_actor_set_easing_mode (target, CLUTTER_LINEAR);
clutter_actor_set_opacity (target, final_opacity);
clutter_actor_restore_easing_state (target);
}
static void
on_target_drop (ClutterDropAction *action,
ClutterActor *actor,
gfloat event_x,
gfloat event_y)
{
gfloat actor_x, actor_y;
actor_x = actor_y = 0.0f;
clutter_actor_transform_stage_point (actor, event_x, event_y,
&actor_x,
&actor_y);
g_print ("Dropped at %.0f, %.0f (screen: %.0f, %.0f)\n",
actor_x, actor_y,
event_x, event_y);
drop_successful = TRUE;
add_drag_object (actor);
}
int
main (int argc, char *argv[])
{
ClutterActor *dummy;
if (clutter_init (&argc, &argv) != CLUTTER_INIT_SUCCESS)
return EXIT_FAILURE;
stage = clutter_stage_new ();
clutter_stage_set_title (CLUTTER_STAGE (stage), "Drop Action");
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
target1 = clutter_actor_new ();
clutter_actor_set_background_color (target1, CLUTTER_COLOR_LightScarletRed);
clutter_actor_set_size (target1, TARGET_SIZE, TARGET_SIZE);
clutter_actor_set_opacity (target1, 64);
clutter_actor_add_constraint (target1, clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.5));
clutter_actor_set_x (target1, 10);
clutter_actor_set_reactive (target1, TRUE);
clutter_actor_add_action_with_name (target1, "drop", clutter_drop_action_new ());
g_signal_connect (clutter_actor_get_action (target1, "drop"),
"over-in",
G_CALLBACK (on_target_over),
GUINT_TO_POINTER (TRUE));
g_signal_connect (clutter_actor_get_action (target1, "drop"),
"over-out",
G_CALLBACK (on_target_over),
GUINT_TO_POINTER (FALSE));
g_signal_connect (clutter_actor_get_action (target1, "drop"),
"drop",
G_CALLBACK (on_target_drop),
NULL);
dummy = clutter_actor_new ();
clutter_actor_set_background_color (dummy, CLUTTER_COLOR_DarkOrange);
clutter_actor_set_size (dummy,
640 - (2 * 10) - (2 * (TARGET_SIZE + 10)),
TARGET_SIZE);
clutter_actor_add_constraint (dummy, clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0.5));
clutter_actor_add_constraint (dummy, clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.5));
clutter_actor_set_reactive (dummy, TRUE);
target2 = clutter_actor_new ();
clutter_actor_set_background_color (target2, CLUTTER_COLOR_LightChameleon);
clutter_actor_set_size (target2, TARGET_SIZE, TARGET_SIZE);
clutter_actor_set_opacity (target2, 64);
clutter_actor_add_constraint (target2, clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.5));
clutter_actor_set_x (target2, 640 - TARGET_SIZE - 10);
clutter_actor_set_reactive (target2, TRUE);
clutter_actor_add_action_with_name (target2, "drop", clutter_drop_action_new ());
g_signal_connect (clutter_actor_get_action (target2, "drop"),
"over-in",
G_CALLBACK (on_target_over),
GUINT_TO_POINTER (TRUE));
g_signal_connect (clutter_actor_get_action (target2, "drop"),
"over-out",
G_CALLBACK (on_target_over),
GUINT_TO_POINTER (FALSE));
g_signal_connect (clutter_actor_get_action (target2, "drop"),
"drop",
G_CALLBACK (on_target_drop),
NULL);
clutter_actor_add_child (stage, target1);
clutter_actor_add_child (stage, dummy);
clutter_actor_add_child (stage, target2);
add_drag_object (target1);
clutter_actor_show (stage);
clutter_main ();
return EXIT_SUCCESS;
}