Tree / Playlist Viewer / Menu: Fix redraw issues

1) Tree_lists was only initialized when booting the player.

In cases where a skin used custom UI viewports of
different sizes, when switching between screens, such as
between root menu, QuickScreen, and tree browser, this
caused list titles to appear with a significant delay,
unless a GUI_EVENT_ACTIONUPDATE was sent.

Tree_lists is now initialized when entering dirbrowse
or when restoring/reloading the list.

This eliminates multiple redundant UI refreshes when
entering the tree browser, due to gui_synclist_draw not
being called twice anymore and by being able to omit
GUI_EVENT_ACTIONUPDATE.

Separate calls to gui_synclist_init_display_settings
have become unnecessary since it is already called
by gui_synclist_init.

2) The synclist is also re-initialized when returning
from the QuickScreen in the Playlist Viewer or
regular menus, or when returning from Settings
menus

Change-Id: I2884249eda55f782e97abad9dc19b3d9d1267fc9

apps/main.c

@@ -167,7 +167,7 @@ int main(void)
         screens[i].update();
     }
     list_init();
-    tree_gui_init();
+    tree_init();
     /* Keep the order of this 3
      * Must be done before any code uses the multi-screen API */
 #ifdef HAVE_USBSTACK

apps/menu.c

@@ -466,6 +466,8 @@ int do_menu(const struct menu_item_ex *start_menu, int *start_selected,
                     done = true;
                 }
             }
+            if (!done)
+                init_menu_lists(menu, &lists, lists.selected_item, false, vps);
             redraw_lists = true;
         }
 #endif
@@ -670,7 +672,9 @@ int do_menu(const struct menu_item_ex *start_menu, int *start_selected,
                 case MT_SETTING_W_TEXT:
                 {
                     do_setting_from_menu(temp, vps);
-                    send_event(GUI_EVENT_ACTIONUPDATE, (void*)1); /* force a redraw */
+                    init_menu_lists(menu, &lists, selected, false, vps);
+                    redraw_lists = true;
+
                     break;
                 }
                 case MT_RETURN_ID:

apps/playlist_viewer.c

@@ -1017,7 +1017,7 @@ enum playlist_viewer_result playlist_viewer_ex(const char* filename,
                     {
                         quick_screen_quick(button);
                         update_playlist(true);
-                        update_lists(&playlist_lists);
+                        prepare_lists(&playlist_lists);
                     }
                     break;
 #endif

apps/tree.c

@@ -80,7 +80,7 @@
 static const struct filetype *filetypes;
 static int filetypes_count;
 
-struct gui_synclist tree_lists;
+static struct gui_synclist tree_lists;
 
 /* I put it here because other files doesn't use it yet,
  * but should be elsewhere since it will be used mostly everywhere */
@@ -301,19 +301,10 @@ bool check_rockboxdir(void)
 }
 
 /* do this really late in the init sequence */
-void tree_gui_init(void)
+void tree_init(void)
 {
     check_rockboxdir();
-
     strcpy(tc.currdir, "/");
-
-    gui_synclist_init(&tree_lists, &tree_get_filename, &tc, false, 1, NULL);
-    gui_synclist_set_voice_callback(&tree_lists, tree_voice_cb);
-    gui_synclist_set_icon_callback(&tree_lists,
-                                    global_settings.show_icons?&tree_get_fileicon:NULL);
-#ifdef HAVE_LCD_COLOR
-    gui_synclist_set_color_callback(&tree_lists, &tree_get_filecolor);
-#endif
 }
 
 
@@ -419,6 +410,9 @@ static int update_dir(void)
             splash(HZ, ID2P(LANG_SHOWDIR_BUFFER_FULL));
         }
     }
+
+    gui_synclist_init(&tree_lists, &tree_get_filename, &tc, false, 1, NULL);
+
 #ifdef HAVE_TAGCACHE
     if (id3db)
     {
@@ -472,6 +466,10 @@ static int update_dir(void)
     gui_synclist_set_nb_items(&tree_lists, tc.filesindir);
     gui_synclist_set_icon_callback(&tree_lists,
                                    global_settings.show_icons?tree_get_fileicon:NULL);
+    gui_synclist_set_voice_callback(&tree_lists, tree_voice_cb);
+#ifdef HAVE_LCD_COLOR
+    gui_synclist_set_color_callback(&tree_lists, &tree_get_filecolor);
+#endif
     if( tc.selected_item >= tc.filesindir)
         tc.selected_item=tc.filesindir-1;
 
@@ -657,8 +655,6 @@ static int dirbrowse(void)
         return GO_TO_PREVIOUS;  /* No files found for rockbox_browse() */
     }
 
-    send_event(GUI_EVENT_ACTIONUPDATE, (void*)1); /* force a redraw */
-    gui_synclist_draw(&tree_lists);
     while(1) {
         bool restore = false;
         if (tc.dirlevel < 0)
@@ -706,9 +702,6 @@ static int dirbrowse(void)
 #endif
                     case GO_TO_ROOT: exit_func = true; break;
                     default:
-                        if (*tc.dirfilter == SHOW_CFG) /* theme changed */
-                            gui_synclist_init_display_settings(&tree_lists);
-
                         break;
                 }
                 restore = true;
@@ -1000,8 +993,6 @@ int rockbox_browse(struct browse_context *browse)
     tc.dirfilter = &dirfilter;
     tc.sort_dir = global_settings.sort_dir;
 
-    gui_synclist_init_display_settings(&tree_lists); /* grab updated settings */
-
     reload_dir = true;
     if (*tc.dirfilter >= NUM_FILTER_MODES)
     {

apps/tree.h

@@ -102,7 +102,7 @@ struct entry* tree_get_entries(struct tree_context *t);
 struct entry* tree_get_entry_at(struct tree_context *t, int index);
 
 void tree_mem_init(void) INIT_ATTR;
-void tree_gui_init(void) INIT_ATTR;
+void tree_init(void) INIT_ATTR;
 char* get_current_file(char* buffer, size_t buffer_len);
 void set_dirfilter(int l_dirfilter);
 void set_current_file(const char *path);
@@ -133,5 +133,4 @@ void tree_restore(void);
 bool bookmark_play(char* resume_file, int index, unsigned long elapsed,
                    unsigned long offset, int seed, char *filename);
 
-extern struct gui_synclist tree_lists;
 #endif