Standalone app api v3 (#2772)

Added file io, and updated some ui elements.
Also added Digital Rain standalone app for an example.

firmware/standalone/digitalrain/ui/theme.hpp

@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2024 HTotoo
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __THEME_H__
+#define __THEME_H__
+#include <cstdint>
+#include <cstddef>
+#include <memory>
+#include "ui_painter.hpp"
+#include "ui_font_fixed_5x8.hpp"
+#include "ui_font_fixed_8x16.hpp"
+
+namespace ui {
+
+class ThemeTemplate {
+   public:
+    ~ThemeTemplate();
+    Style* bg_lightest;
+    Style* bg_lightest_small;
+    Style* bg_light;
+    Style* bg_medium;
+    Style* bg_dark;
+    Style* bg_darker;
+
+    Style* bg_darkest;
+    Style* bg_darkest_small;
+
+    Style* bg_important_small;
+
+    Style* error_dark;
+    Style* warning_dark;
+    Style* ok_dark;
+
+    Style* fg_dark;
+    Style* fg_medium;
+    Style* fg_light;
+
+    Style* fg_red;
+    Style* fg_green;
+    Style* fg_yellow;
+    Style* fg_orange;
+    Style* fg_blue;
+    Style* fg_cyan;
+    Style* fg_darkcyan;
+    Style* fg_magenta;
+
+    Style* option_active;
+
+    Color* status_active;  // green, the status bar icons when active
+    Color* bg_table_header;
+};
+
+class ThemeDefault : public ThemeTemplate {
+   public:
+    ThemeDefault();
+};
+
+class ThemeYellow : public ThemeTemplate {
+   public:
+    ThemeYellow();
+};
+
+class ThemeAqua : public ThemeTemplate {
+   public:
+    ThemeAqua();
+};
+
+class ThemeGreen : public ThemeTemplate {
+   public:
+    ThemeGreen();
+};
+
+class ThemeRed : public ThemeTemplate {
+   public:
+    ThemeRed();
+};
+
+class ThemeDark : public ThemeTemplate {
+   public:
+    ThemeDark();
+};
+
+class Theme {
+   public:
+    enum ThemeId {
+        DefaultGrey = 0,
+        Yellow = 1,
+        Aqua = 2,
+        Green = 3,
+        Red = 4,
+        Dark = 5,
+        MAX
+    };
+    static ThemeTemplate* getInstance();
+
+    static void SetTheme(ThemeId theme);
+    static ThemeTemplate* current;
+    static void destroy();
+
+   private:
+};
+
+}  // namespace ui
+#endif /*__THEME_H__*/