Add more menu improvements

- X button opens/closes menu
 - Wait for button release before resuming

src/menu.c

@@ -33,6 +33,17 @@ static int wait_for_input(nes_Input_Reader* reader,
     return status;
 }
 
+static int wait_for_input_quiet(nes_Input_Reader* reader,
+                                nes_input* input) {
+    int status = 0;
+    while ( input_Result_Quit != status &&
+            input->controllers[0].buttons) {
+        time_sleep(US_PER_S / 60);
+        status = nes_input_update(reader, input);
+    }
+    return (    input_Result_Quit == status ?
+                input_Result_Quit : 0);
+}
 
 static int count_files(DIR* dir) {
     int count = 0;
@@ -170,7 +181,8 @@ static int run_menu(menu_state* state, const file_list* files,
         if (input_Result_Quit == special) {
             status = special;
 
-        } else if (buttons & (1 << Button_B)) {
+        } else if ( input_Result_Menu == special ||
+                    (buttons & (1 << Button_B))) {
             status = input_Result_Cancel;
 
         } else if (buttons & (  (1 << Button_A) |
@@ -277,10 +289,16 @@ int run_game_menu(menu_state* state, nes_Renderer* rend,
     int status = run_menu(&menu, &options, 100,
                           rend, input, sys);
 
-    if (NULL != state) *state = menu;
+    if (input_Result_Menu == status) {
+        status = input_Result_Cancel;
+    }
 
     if (0 == status) status = choices[menu.cursor];
 
+    wait_for_input_quiet(input, &sys->input);
+
+    if (NULL != state) *state = menu;
+
     return status;
 }
 

src/sdl_input.c

@@ -68,6 +68,7 @@ static const int sdl_keycodes[nes_controller_num_buttons] = {
     SDLK_RIGHT,
 };
 
+static const int sdl_menu_button = SDL_CONTROLLER_BUTTON_X;
 static const int sdl_save_button = SDL_CONTROLLER_BUTTON_LEFTSHOULDER;
 static const int sdl_load_button = SDL_CONTROLLER_BUTTON_RIGHTSHOULDER;
 
@@ -142,6 +143,11 @@ static int sdl_input_update(nes_Input_Reader* reader,
                     input->controllers[0].buttons &= ~mask;
                 }
 
+            } else if (sdl_menu_button == event.cbutton.button) {
+                if (SDL_CONTROLLERBUTTONDOWN == event.type) {
+                    status = input_Result_Menu;
+                }
+
             } else if (sdl_save_button == event.cbutton.button) {
                 if (SDL_CONTROLLERBUTTONDOWN == event.type) {
                     status = input_Result_Save;