playlist_viewer: show loading splash for current playlist after delay

commit ce403586e0b0f34d2f5035235907eb64cd91c28e
Author: Christian Soffke <[email protected]>
Date:   Thu May 7 01:45:51 2026 +0200

    playlist_viewer: show loading splash for current playlist after delay
    
    Provide UI feedback if playlist can't be displayed in time.
    
    Change-Id: I5faabc2690aaeb6989f342dc284e1e7e38ba1d7d

diff --git a/apps/playlist_viewer.c b/apps/playlist_viewer.c
index 4ec8dd59bf..176d15a989 100644
--- a/apps/playlist_viewer.c
+++ b/apps/playlist_viewer.c
@@ -124,6 +124,8 @@ struct playlist_viewer {
     struct playlist_buffer buffer;
     struct mp3entry *id3;
     bool allow_view_text_plugin;
+    unsigned long loading_tick;
+    bool is_open;
 };
 
 struct playlist_search_data
@@ -214,6 +216,13 @@ static void playlist_buffer_load_entries(struct playlist_buffer *pb, int index,
 
     for (i = 0; i < num_entries; i++)
     {
+        /* provide UI feedback if opening Playlist Viewer is taking too long */
+        if (!viewer.is_open && TIME_AFTER(current_tick, viewer.loading_tick))
+        {
+            viewer.loading_tick += HZ*10;
+            splash(0, ID2P(LANG_WAIT));
+        }
+
         int len = playlist_entry_load(&(pb->tracks[i]), index, p, remaining);
         if (len < 0)
         {
@@ -663,6 +672,7 @@ static void close_playlist_viewer(void)
         }
         playlist_close(viewer.playlist);
     }
+    viewer.is_open = false;
 }
 
 #if defined(HAVE_HOTKEY) || defined(HAVE_TAGCACHE)
@@ -960,9 +970,12 @@ static bool open_playlist_viewer(const char* filename,
                                   struct gui_synclist *playlist_lists,
                                   bool reload, int *most_recent_selection)
 {
+    viewer.loading_tick = current_tick + HZ/3;
     push_current_activity(ACTIVITY_PLAYLISTVIEWER);
 
-    if (!playlist_viewer_init(&viewer, filename, reload, most_recent_selection))
+    if (playlist_viewer_init(&viewer, filename, reload, most_recent_selection))
+        viewer.is_open = true;
+    else
         return false;
 
     update_gui(playlist_lists, true);
-- 
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