Added theme system

core/src/gui/menus/theme.cpp

@@ -0,0 +1,47 @@
+#include <gui/menus/theme.h>
+#include <gui/gui.h>
+#include <options.h>
+#include <core.h>>
+
+namespace thememenu {
+    int themeId;
+    std::vector<std::string> themeNames;
+    std::string themeNamesTxt;
+
+    void init(std::string resDir) {
+        // TODO: Not hardcode theme directory
+        gui::themeManager.loadThemesFromDir(resDir + "/themes/");
+        core::configManager.aquire();
+        std::string selectedThemeName = core::configManager.conf["theme"];
+        core::configManager.release();
+
+        // Select theme by name, if not available, apply Dark theme
+        themeNames = gui::themeManager.getThemeNames();
+        auto it = std::find(themeNames.begin(), themeNames.end(), selectedThemeName);
+        if (it == themeNames.end()) {
+            it = std::find(themeNames.begin(), themeNames.end(), "Dark");
+            selectedThemeName = "Dark";
+        }
+        gui::themeManager.applyTheme(selectedThemeName);
+        themeId = std::distance(themeNames.begin(), it);
+
+        themeNamesTxt = "";
+        for (auto name : themeNames) {
+            themeNamesTxt += name;
+            themeNamesTxt += '\0';
+        }
+    }
+
+    void draw(void* ctx) {
+        float menuWidth = ImGui::GetContentRegionAvailWidth();
+        ImGui::Text("Theme");
+        ImGui::SameLine();
+        ImGui::SetNextItemWidth(menuWidth - ImGui::GetCursorPosX());
+        if (ImGui::Combo("##theme_select_combo", &themeId, themeNamesTxt.c_str())) {
+            gui::themeManager.applyTheme(themeNames[themeId]);
+            core::configManager.aquire();
+            core::configManager.conf["theme"] = themeNames[themeId];
+            core::configManager.release(true);
+        }
+    }
+}

core/src/gui/menus/theme.h

@@ -0,0 +1,7 @@
+#pragma once
+#include <string>
+
+namespace thememenu {
+    void init(std::string resDir);
+    void draw(void* ctx);
+}