#include #include #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; }