ffplay: toggle full screen when double-clicking the video window with the left mouse button

Now that the seek only happens with the right mouse button, it makes
sense to toggle full screen when double-clicking with the left mouse
button, like other video players do.
Signed-off-by: Vittorio Gambaletta <ffmpeg-dev@vittgam.net>
Signed-off-by: Marton Balint <cus@passwd.hu>

Changelog

@@ -55,6 +55,7 @@ version <next>:
 - spectrumsynth filter
 - ahistogram filter
 - only seek with the right mouse button in ffplay
+- toggle full screen when double-clicking with the left mouse button in ffplay
 
 
 version 2.8:

ffplay.c

@@ -3473,6 +3473,16 @@ static void event_loop(VideoState *cur_stream)
                 do_exit(cur_stream);
                 break;
             }
+            if (event.button.button == SDL_BUTTON_LEFT) {
+                static int64_t last_mouse_left_click = 0;
+                if (av_gettime_relative() - last_mouse_left_click <= 500000) {
+                    toggle_full_screen(cur_stream);
+                    cur_stream->force_refresh = 1;
+                    last_mouse_left_click = 0;
+                } else {
+                    last_mouse_left_click = av_gettime_relative();
+                }
+            }
         case SDL_MOUSEMOTION:
             if (cursor_hidden) {
                 SDL_ShowCursor(1);