Implement menu system: add DrawMenu function and MenuItem structure for enhanced menu handling

src/app/gui/input.cc

@@ -255,13 +255,15 @@ bool InputTileInfo(const char* label, gfx::TileInfo* tile_info) {
 
 ImGuiID GetID(const std::string& id) { return ImGui::GetID(id.c_str()); }
 
-void AddTableColumn(Table &table, const std::string &label, GuiElement element) {
+void AddTableColumn(Table& table, const std::string& label,
+                    GuiElement element) {
   table.column_labels.push_back(label);
   table.column_contents.push_back(element);
 }
 
 void DrawTable(Table& params) {
-  if (ImGui::BeginTable(params.id, params.num_columns, params.flags, params.size)) {
+  if (ImGui::BeginTable(params.id, params.num_columns, params.flags,
+                        params.size)) {
     for (int i = 0; i < params.num_columns; ++i)
       ImGui::TableSetupColumn(params.column_labels[i].c_str());
 
@@ -280,5 +282,34 @@ void DrawTable(Table& params) {
   }
 }
 
+void DrawMenu(Menu& menu) {
+  for (const auto& each_menu : menu) {
+    if (ImGui::BeginMenu(each_menu.name.c_str())) {
+      for (const auto& each_item : each_menu.subitems) {
+        if (!each_item.subitems.empty()) {
+          if (ImGui::BeginMenu(each_item.name.c_str())) {
+            for (const auto& each_subitem : each_item.subitems) {
+              if (ImGui::MenuItem(each_subitem.name.c_str(),
+                                  each_subitem.shortcut.c_str())) {
+                if (each_subitem.callback) each_subitem.callback();
+              }
+            }
+            ImGui::EndMenu();
+          }
+        } else if (each_item.name == "-") {
+          ImGui::Separator();
+        } else {
+          if (ImGui::MenuItem(each_item.name.c_str(),
+                              each_item.shortcut.c_str(),
+                              each_item.enabled_condition())) {
+            if (each_item.callback) each_item.callback();
+          }
+        }
+      }
+      ImGui::EndMenu();
+    }
+  }
+}
+
 }  // namespace gui
 }  // namespace yaze

src/app/gui/input.h

@@ -11,6 +11,7 @@
 #include <variant>
 #include <vector>
 
+#include "absl/strings/str_cat.h"
 #include "absl/strings/string_view.h"
 #include "app/gfx/snes_tile.h"
 #include "imgui/imgui.h"
@@ -67,7 +68,63 @@ void AddTableColumn(Table &table, const std::string &label, GuiElement element);
 
 void DrawTable(Table &params);
 
-} // namespace gui
-} // namespace yaze
+static std::function<bool()> kDefaultEnabledCondition = []() { return false; };
+
+struct MenuItem {
+  std::string name;
+  std::string shortcut;
+  std::function<void()> callback;
+  std::function<bool()> enabled_condition = kDefaultEnabledCondition;
+  std::vector<MenuItem> subitems;
+};
+using Menu = std::vector<MenuItem>;
+
+void DrawMenu(Menu &params);
+
+enum MenuType {
+  kFile,
+  kEdit,
+  kView,
+  kTools,
+  kHelp,
+};
+
+static Menu kMainMenu;
+
+inline void AddToMenu(const std::string &label, const char *icon,
+                      MenuType type) {
+  if (icon) {
+    kMainMenu[type].subitems.emplace_back(absl::StrCat(icon, " ", label), "",
+                                          nullptr);
+  } else {
+    kMainMenu[type].subitems.emplace_back(label, "", nullptr);
+  }
+}
+
+inline void AddToFileMenu(const std::string &label, const std::string &shortcut,
+                          std::function<void()> callback) {
+  kMainMenu[MenuType::kFile].subitems.emplace_back(label, shortcut, callback);
+}
+
+inline void AddToFileMenu(const std::string &label, const std::string &shortcut,
+                          std::function<void()> callback,
+                          std::function<bool()> enabled_condition,
+                          std::vector<MenuItem> subitems) {
+  kMainMenu[MenuType::kFile].subitems.emplace_back(label, shortcut, callback,
+                                                   enabled_condition, subitems);
+}
+
+inline void AddToEditMenu(const std::string &label, const std::string &shortcut,
+                          std::function<void()> callback) {
+  kMainMenu[MenuType::kEdit].subitems.emplace_back(label, shortcut, callback);
+}
+
+inline void AddToViewMenu(const std::string &label, const std::string &shortcut,
+                          std::function<void()> callback) {
+  kMainMenu[MenuType::kView].subitems.emplace_back(label, shortcut, callback);
+}
+
+}  // namespace gui
+}  // namespace yaze
 
 #endif

src/app/gui/style.cc

@@ -1,6 +1,7 @@
 #include "style.h"
 
 #include "app/core/platform/file_dialog.h"
+#include "core/platform/font_loader.h"
 #include "gui/color.h"
 #include "imgui/imgui.h"
 #include "imgui/imgui_internal.h"
@@ -752,12 +753,21 @@ void TextWithSeparators(const absl::string_view &text) {
 void DrawFontManager() {
   ImGuiIO& io = ImGui::GetIO();
   ImFontAtlas* atlas = io.Fonts;
+
   static ImFont* current_font = atlas->Fonts[0];
   static int current_font_index = 0;
   static int font_size = 16;
   static bool font_selected = false;
+
+  ImGui::Text("Loaded fonts");
+  for (const auto& loaded_font : core::global_font_state.fonts) {
+    ImGui::Text("%s", loaded_font.font_path);
+  }
+  ImGui::Separator();
+
   ImGui::Text("Current Font: %s", current_font->GetDebugName());
   ImGui::Text("Font Size: %d", font_size);
+
   if (ImGui::BeginCombo("Fonts", current_font->GetDebugName())) {
     for (int i = 0; i < atlas->Fonts.Size; i++) {
       bool is_selected = (current_font == atlas->Fonts[i]);
@@ -772,6 +782,7 @@ void DrawFontManager() {
     }
     ImGui::EndCombo();
   }
+
   ImGui::Separator();
   if (ImGui::SliderInt("Font Size", &font_size, 8, 32)) {
     current_font->Scale = font_size / 16.0f;