Extra2D/examples/push_box/StartScene.cpp

// ============================================================================
// StartScene.cpp - Push Box 开始场景实现
// ============================================================================

#include "StartScene.h"

#include "PlayScene.h"
#include "audio_manager.h"
#include "data.h"
#include <extra2d.h>

namespace pushbox {

StartScene::StartScene() : BaseScene() {
  // BaseScene 已处理视口设置
}

/**
 * @brief 加载菜单字体
 */
static extra2d::Ptr<extra2d::FontAtlas> loadMenuFont() {
  auto &resources = extra2d::Application::instance().resources();
  auto font = resources.loadFont("assets/font.ttf", 28, true);
  return font;
}

void StartScene::onEnter() {
  BaseScene::onEnter();

  auto &app = extra2d::Application::instance();
  auto &resources = app.resources();

  if (children().empty()) {
    // 使用游戏逻辑分辨率
    float screenW = GAME_WIDTH;
    float screenH = GAME_HEIGHT;

    auto bgTex = resources.loadTexture("assets/images/start.jpg");
    if (bgTex) {
      auto background = extra2d::Sprite::create(bgTex);
      float bgWidth = static_cast<float>(bgTex->getWidth());
      float bgHeight = static_cast<float>(bgTex->getHeight());
      float offsetX = (screenW - bgWidth) / 2.0f;
      float offsetY = (screenH - bgHeight) / 2.0f;

      background->setAnchor(0.0f, 0.0f);
      background->setPosition(offsetX, offsetY);
      addChild(background);

      float centerX = screenW / 2.0f;

      font_ = loadMenuFont();
      if (!font_) {
        return;
      }

      // 创建菜单按钮（使用 Button 实现文本居中）
      startBtn_ = extra2d::Button::create();
      startBtn_->setFont(font_);
      startBtn_->setText("新游戏");
      startBtn_->setTextColor(extra2d::Colors::Black);
      startBtn_->setBackgroundColor(extra2d::Colors::Transparent,
                                    extra2d::Colors::Transparent,
                                    extra2d::Colors::Transparent);
      startBtn_->setBorder(extra2d::Colors::Transparent, 0.0f);
      startBtn_->setPadding(extra2d::Vec2(0.0f, 0.0f));
      startBtn_->setCustomSize(200.0f, 40.0f);
      startBtn_->setAnchor(0.5f, 0.5f);
      startBtn_->setPosition(centerX, offsetY + 260.0f);
      addChild(startBtn_);

      resumeBtn_ = extra2d::Button::create();
      resumeBtn_->setFont(font_);
      resumeBtn_->setText("继续关卡");
      resumeBtn_->setTextColor(extra2d::Colors::Black);
      resumeBtn_->setBackgroundColor(extra2d::Colors::Transparent,
                                     extra2d::Colors::Transparent,
                                     extra2d::Colors::Transparent);
      resumeBtn_->setBorder(extra2d::Colors::Transparent, 0.0f);
      resumeBtn_->setPadding(extra2d::Vec2(0.0f, 0.0f));
      resumeBtn_->setCustomSize(200.0f, 40.0f);
      resumeBtn_->setAnchor(0.5f, 0.5f);
      resumeBtn_->setPosition(centerX, offsetY + 300.0f);
      addChild(resumeBtn_);

      exitBtn_ = extra2d::Button::create();
      exitBtn_->setFont(font_);
      exitBtn_->setText("退出");
      exitBtn_->setTextColor(extra2d::Colors::Black);
      exitBtn_->setBackgroundColor(extra2d::Colors::Transparent,
                                   extra2d::Colors::Transparent,
                                   extra2d::Colors::Transparent);
      exitBtn_->setBorder(extra2d::Colors::Transparent, 0.0f);
      exitBtn_->setPadding(extra2d::Vec2(0.0f, 0.0f));
      exitBtn_->setCustomSize(200.0f, 40.0f);
      exitBtn_->setAnchor(0.5f, 0.5f);
      exitBtn_->setPosition(centerX, offsetY + 340.0f);
      addChild(exitBtn_);

      // 音效开关按钮（使用 Button 的切换模式）
      auto soundOn = resources.loadTexture("assets/images/soundon.png");
      auto soundOff = resources.loadTexture("assets/images/soundoff.png");
      if (soundOn && soundOff) {
        soundBtn_ = extra2d::Button::create();
        soundBtn_->setToggleMode(true);
        soundBtn_->setStateBackgroundImage(soundOff, soundOn);
        soundBtn_->setOn(g_SoundOpen);
        soundBtn_->setAnchor(0.0f, 0.0f);
        soundBtn_->setPosition(offsetX + 50.0f, offsetY + 50.0f);
        soundBtn_->setOnStateChange([](bool isOn) {
          g_SoundOpen = isOn;
          AudioManager::instance().setEnabled(isOn);
        });
        addChild(soundBtn_);
      }
    }
  }

  // 始终有3个菜单项
  menuCount_ = 3;
  updateMenuColors();
}

void StartScene::onUpdate(float dt) {
  BaseScene::onUpdate(dt);

  auto &app = extra2d::Application::instance();
  auto &input = app.input();

  // 方向键上下切换选择
  if (input.isButtonPressed(extra2d::GamepadButton::DPadUp)) {
    selectedIndex_ = (selectedIndex_ - 1 + menuCount_) % menuCount_;
    updateMenuColors();
  } else if (input.isButtonPressed(extra2d::GamepadButton::DPadDown)) {
    selectedIndex_ = (selectedIndex_ + 1) % menuCount_;
    updateMenuColors();
  }

  // A键确认
  if (input.isButtonPressed(extra2d::GamepadButton::A)) {
    executeMenuItem();
  }

  // X键切换音效（备用，按钮也可点击切换）
  if (input.isButtonPressed(extra2d::GamepadButton::X)) {
    g_SoundOpen = !g_SoundOpen;
    AudioManager::instance().setEnabled(g_SoundOpen);
    if (soundBtn_) {
      soundBtn_->setOn(g_SoundOpen);
    }
  }
}

/**
 * @brief 更新菜单颜色
 */
void StartScene::updateMenuColors() {
  // 根据选中状态更新按钮文本颜色
  // 选中的项用红色，未选中的用黑色，禁用的项用深灰色

  if (startBtn_) {
    startBtn_->setTextColor(selectedIndex_ == 0 ? extra2d::Colors::Red
                                                : extra2d::Colors::Black);
  }

  if (resumeBtn_) {
    // "继续关卡"始终显示，但当 g_CurrentLevel == 1 时禁用（深灰色）
    if (g_CurrentLevel > 1) {
      // 可用状态：选中为红色，未选中为黑色
      resumeBtn_->setTextColor(selectedIndex_ == 1 ? extra2d::Colors::Red
                                                   : extra2d::Colors::Black);
    } else {
      // 禁用状态：深灰色 (RGB: 80, 80, 80)
      resumeBtn_->setTextColor(extra2d::Color(80, 80, 80, 255));
    }
  }

  if (exitBtn_) {
    exitBtn_->setTextColor(selectedIndex_ == 2 ? extra2d::Colors::Red
                                               : extra2d::Colors::Black);
  }
}

/**
 * @brief 执行选中的菜单项
 */
void StartScene::executeMenuItem() {
  // 始终有3个选项，但"继续关卡"(索引1)在 g_CurrentLevel == 1 时禁用
  switch (selectedIndex_) {
  case 0:
    startNewGame();
    break;
  case 1:
    // 只有当 g_CurrentLevel > 1 时才能选择"继续关卡"
    if (g_CurrentLevel > 1) {
      continueGame();
    }
    break;
  case 2:
    exitGame();
    break;
  }
}

/**
 * @brief 开始新游戏
 */
void StartScene::startNewGame() {
  extra2d::Application::instance().scenes().replaceScene(
      extra2d::makePtr<PlayScene>(1), extra2d::TransitionType::Fade, 0.5f);
}

/**
 * @brief 继续游戏
 */
void StartScene::continueGame() {
  extra2d::Application::instance().scenes().replaceScene(
      extra2d::makePtr<PlayScene>(g_CurrentLevel),
      extra2d::TransitionType::Fade, 0.5f);
}

/**
 * @brief 退出游戏
 */
void StartScene::exitGame() { extra2d::Application::instance().quit(); }

} // namespace pushbox