Introduce common helper functions

src/activities/MenuListActivity.cpp

@@ -0,0 +1,70 @@
+#include "MenuListActivity.h"
+
+#include <I18n.h>
+
+#include "MappedInputManager.h"
+#include "components/UITheme.h"
+
+void MenuListActivity::initMenuList() {
+  const int count = static_cast<int>(menuItems.size());
+  const auto pred = UITheme::makeSelectablePredicate(count, [this](int i) { return menuItems[i].getTitle(); });
+  buttonNavigator.setSelectablePredicate(pred, count);
+  if (count > 0 && !pred(selectedIndex)) {
+    selectedIndex = buttonNavigator.nextIndex(selectedIndex);
+  }
+}
+
+void MenuListActivity::onEnter() {
+  Activity::onEnter();
+  initMenuList();
+  requestUpdate();
+}
+
+void MenuListActivity::handleNavigation() {
+  buttonNavigator.onNext([this] {
+    selectedIndex = buttonNavigator.nextIndex(selectedIndex);
+    requestUpdate();
+  });
+  buttonNavigator.onPrevious([this] {
+    selectedIndex = buttonNavigator.previousIndex(selectedIndex);
+    requestUpdate();
+  });
+}
+
+void MenuListActivity::toggleCurrentItem() {
+  if (selectedIndex < 0 || selectedIndex >= static_cast<int>(menuItems.size())) return;
+  auto& item = menuItems[selectedIndex];
+  if (item.isSeparator) return;
+
+  if (item.type == SettingType::ACTION) {
+    onActionSelected(selectedIndex);
+    return;
+  }
+
+  item.toggleValue();
+  onSettingToggled(selectedIndex);
+  requestUpdate();
+}
+
+std::string MenuListActivity::getItemValueString(int index) const {
+  return menuItems[index].getDisplayValue();
+}
+
+void MenuListActivity::drawMenuList(const Rect& rect) {
+  const int count = static_cast<int>(menuItems.size());
+  GUI.drawList(
+      renderer, rect, count, selectedIndex, [this](int index) { return menuItems[index].getTitle(); }, nullptr, nullptr,
+      [this](int index) { return getItemValueString(index); }, true);
+}
+
+void MenuListActivity::loop() {
+  if (mappedInput.wasPressed(MappedInputManager::Button::Back)) {
+    onBackPressed();
+    return;
+  }
+  if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
+    toggleCurrentItem();
+    return;
+  }
+  handleNavigation();
+}