From 93c5b7fccd45e07969e34b2f60b1acc0f6a00e11 Mon Sep 17 00:00:00 2001
From: philmoz <philmoz@users.noreply.github.com>
Date: Wed, 16 Apr 2025 11:40:13 +1000
Subject: [PATCH] feat(lua): allow the filename for an image object to be set
 via a function (#6091)

---
 radio/src/lua/lua_lvgl_widget.cpp | 27 +++++++++++++++++++++++++--
 radio/src/lua/lua_lvgl_widget.h   |  5 ++++-
 2 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/radio/src/lua/lua_lvgl_widget.cpp b/radio/src/lua/lua_lvgl_widget.cpp
index 148db81ce..88571fcf9 100644
--- a/radio/src/lua/lua_lvgl_widget.cpp
+++ b/radio/src/lua/lua_lvgl_widget.cpp
@@ -1464,7 +1464,7 @@ void LvglWidgetArc::build(lua_State *L)
 void LvglWidgetImage::parseParam(lua_State *L, const char *key)
 {
   if (!strcmp(key, "file")) {
-    filename = luaL_checkstring(L, -1);
+    filename.parse(L, LvglParamFuncOrValue::PTXT);
   } else if (!strcmp(key, "fill")) {
     fillFrame = lua_toboolean(L, -1);
   } else {
@@ -1472,10 +1472,33 @@ void LvglWidgetImage::parseParam(lua_State *L, const char *key)
   }
 }
 
+bool LvglWidgetImage::callRefs(lua_State *L)
+{
+  int t = lua_gettop(L);
+  if (filename.function != LUA_REFNIL) {
+    if (pcallFunc(L, filename.function, 1)) {
+      const char *s = luaL_checkstring(L, -1);
+      if (filename.changedText(s)) {
+        ((StaticImage*)window)->setSource(filename.txt);
+      }
+      lua_settop(L, t);
+    } else {
+      return false;
+    }
+  }
+  return LvglWidgetObject::callRefs(L);
+}
+
+void LvglWidgetImage::clearRefs(lua_State *L)
+{
+  clearRef(L, filename.function);
+  LvglWidgetObject::clearRefs(L);
+}
+
 void LvglWidgetImage::build(lua_State *L)
 {
   window = new StaticImage(lvglManager->getCurrentParent(), {x, y, w, h},
-                           filename.c_str(), fillFrame);
+                           filename.txt, fillFrame);
 }
 
 //-----------------------------------------------------------------------------
diff --git a/radio/src/lua/lua_lvgl_widget.h b/radio/src/lua/lua_lvgl_widget.h
index 4aabc04f3..8a070ee21 100644
--- a/radio/src/lua/lua_lvgl_widget.h
+++ b/radio/src/lua/lua_lvgl_widget.h
@@ -456,8 +456,11 @@ class LvglWidgetImage : public LvglWidgetObject
  public:
   LvglWidgetImage() : LvglWidgetObject(LVGL_SIMPLEMETATABLE) {}
 
+  bool callRefs(lua_State *L) override;
+  void clearRefs(lua_State *L) override;
+
  protected:
-  std::string filename;
+  LvglParamFuncOrValue filename = { .function = LUA_REFNIL, .txt = ""};
   bool fillFrame = false;
 
   void build(lua_State *L) override;