using System;

using sharpallegro5;

using ALLEGRO_DISPLAY = System.IntPtr;
using ALLEGRO_BITMAP = System.IntPtr;
using ALLEGRO_EVENT_QUEUE = System.IntPtr;
using ALLEGRO_TIMER = System.IntPtr;

public class ex_noframe : AllegroExample
{
static int Main()
{
   ALLEGRO_DISPLAY display;
   ALLEGRO_BITMAP bitmap;
   ALLEGRO_EVENT_QUEUE events;
   ALLEGRO_EVENT @event = new ALLEGRO_EVENT();
   bool down = false;
   int down_x = 0, down_y = 0;
   ALLEGRO_TIMER timer;
   bool frame = false;

   if (!al_init()) {
      abort_example("Could not init Allegro.\n");
      return 1;
   }

   al_install_mouse();
   al_install_keyboard();
   al_init_image_addon();

   al_set_new_display_flags(ALLEGRO_NOFRAME);
   display = al_create_display(300, 200);
   if (display == IntPtr.Zero) {
      abort_example("Error creating display\n");
      return 1;
   }
   
   bitmap = al_load_bitmap("data/fakeamp.bmp");
   if (bitmap == IntPtr.Zero) {
      abort_example("Error loading fakeamp.bmp\n");
      return 1;
   }

   timer = al_create_timer(1.0f/30.0f);

   events = al_create_event_queue();
   al_register_event_source(events, al_get_mouse_event_source());
   al_register_event_source(events, al_get_keyboard_event_source());
   al_register_event_source(events, al_get_display_event_source(display));
   al_register_event_source(events, al_get_timer_event_source(timer));

   al_start_timer(timer);

   for (;;) {
      al_wait_for_event(events, ref @event);
      if (@event.type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN) {
         if (@event.mouse.button == 1 && @event.mouse.x > 0) {
            down = true;
            down_x = @event.mouse.x;
            down_y = @event.mouse.y;
         }
         if (@event.mouse.button == 2) {
            frame = !frame;
            al_toggle_display_flag(display, ALLEGRO_NOFRAME, frame);
         }
      }
      else if (@event.type == ALLEGRO_EVENT_DISPLAY_CLOSE) {
         break;
      }
      else if (@event.type == ALLEGRO_EVENT_MOUSE_BUTTON_UP) {
         if (@event.mouse.button == 1) {
            down = false;
         }
      }
      else if (@event.type == ALLEGRO_EVENT_MOUSE_AXES) {
         if (down) {
            int cx = 0, cy = 0;
            if (al_get_mouse_cursor_position(ref cx, ref cy)) {
               al_set_window_position(display, cx - down_x, cy - down_y);
            }
         }
      }
      else if (@event.type == ALLEGRO_EVENT_KEY_DOWN &&
	    @event.keyboard.keycode == ALLEGRO_KEY_ESCAPE) {
         break;
      }
      else if (@event.type == ALLEGRO_EVENT_TIMER) {
         al_draw_bitmap(bitmap, 0, 0, 0);
         al_flip_display();
      }
   }

   al_destroy_timer(timer);
   al_destroy_event_queue(events);
   al_destroy_display(display);

   return 0;
}
}