216 lines
9.0 KiB
C++
216 lines
9.0 KiB
C++
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#include "input_manager.h"
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#include "../core/config.h"
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#include <stdexcept>
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#include <SDL3/SDL.h>
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#include <spdlog/spdlog.h>
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#include <glm/vec2.hpp>
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namespace engine::input {
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InputManager::InputManager(SDL_Renderer* sdl_renderer, const engine::core::Config* config): sdl_renderer_(sdl_renderer) {
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if (!sdl_renderer_) {
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spdlog::error("输入管理器: SDL_Renderer 为空指针");
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throw std::runtime_error("输入管理器: SDL_Renderer 为空指针");
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}
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initializeMappings(config);
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// 获取初始鼠标位置
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float x, y;
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SDL_GetMouseState(&x, &y);
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mouse_position_ = {x, y};
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spdlog::trace("初始鼠标位置: ({}, {})", mouse_position_.x, mouse_position_.y);
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}
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// --- 更新和事件处理 ---
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void InputManager::update() {
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// 1. 根据上一帧的值更新默认的动作状态
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for (auto& [action_name, state] : action_states_) {
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if (state == ActionState::PRESSED_THIS_FRAME) {
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state = ActionState::HELD_DOWN; // 当某个键按下不动时，并不会生成SDL_Event。
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} else if (state == ActionState::RELEASED_THIS_FRAME) {
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state = ActionState::INACTIVE;
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}
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}
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// 2. 处理所有待处理的 SDL 事件 (这将设定 action_states_ 的值)
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SDL_Event event;
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while (SDL_PollEvent(&event)) {
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processEvent(event);
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}
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}
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void InputManager::processEvent(const SDL_Event& event) {
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switch (event.type) {
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case SDL_EVENT_KEY_DOWN:
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case SDL_EVENT_KEY_UP: {
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SDL_Scancode scancode = event.key.scancode; // 获取按键的scancode
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bool is_down = event.key.down;
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bool is_repeat = event.key.repeat;
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auto it = scancode_to_actions_map_.find(scancode);
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if (it != scancode_to_actions_map_.end()) { // 如果按键有对应的action
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const std::vector<std::string>& associated_actions = it->second;
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for (const std::string& action_name : associated_actions) {
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updateActionState(action_name, is_down, is_repeat); // 更新action状态
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}
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}
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break;
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}
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case SDL_EVENT_MOUSE_BUTTON_DOWN:
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case SDL_EVENT_MOUSE_BUTTON_UP: {
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Uint8 button = event.button.button; // 获取鼠标按钮
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bool is_down = event.button.down;
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auto it = mouse_button_to_actions_map_.find(button);
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if (it != mouse_button_to_actions_map_.end()) { // 如果鼠标按钮有对应的action
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const std::vector<std::string>& associated_actions = it->second;
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for (const std::string& action_name : associated_actions) {
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// 鼠标事件不考虑repeat, 所以第三个参数传false
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updateActionState(action_name, is_down, false); // 更新action状态
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}
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}
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// 在点击时更新鼠标位置
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mouse_position_ = {event.button.x, event.button.y};
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break;
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}
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case SDL_EVENT_MOUSE_MOTION: // 处理鼠标运动
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mouse_position_ = {event.motion.x, event.motion.y};
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break;
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case SDL_EVENT_QUIT:
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should_quit_ = true;
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break;
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default:
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break;
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}
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}
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// --- 状态查询方法 ---
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bool InputManager::isActionDown(const std::string& action_name) const {
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// C++17 引入的 “带有初始化语句的 if 语句”
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if (auto it = action_states_.find(action_name); it != action_states_.end()) {
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return it->second == ActionState::PRESSED_THIS_FRAME || it->second == ActionState::HELD_DOWN;
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}
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return false;
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}
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bool InputManager::isActionPressed(const std::string& action_name) const {
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if (auto it = action_states_.find(action_name); it != action_states_.end()) {
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return it->second == ActionState::PRESSED_THIS_FRAME;
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}
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return false;
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}
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bool InputManager::isActionReleased(const std::string& action_name) const {
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if (auto it = action_states_.find(action_name); it != action_states_.end()) {
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return it->second == ActionState::RELEASED_THIS_FRAME;
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}
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return false;
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}
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bool InputManager::shouldQuit() const {
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return should_quit_;
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}
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void InputManager::setShouldQuit(bool should_quit)
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{
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should_quit_ = should_quit;
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}
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glm::vec2 InputManager::getMousePosition() const
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{
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return mouse_position_;
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}
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glm::vec2 InputManager::getLogicalMousePosition() const
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{
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glm::vec2 logical_pos;
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// 通过窗口坐标获取渲染坐标（逻辑坐标）
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SDL_RenderCoordinatesFromWindow(sdl_renderer_, mouse_position_.x, mouse_position_.y, &logical_pos.x, &logical_pos.y);
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return logical_pos;
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}
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// --- 初始化输入映射 ---
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void InputManager::initializeMappings(const engine::core::Config* config) {
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spdlog::trace("初始化输入映射...");
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if (!config) {
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spdlog::error("输入管理器: Config 为空指针");
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throw std::runtime_error("输入管理器: Config 为空指针");
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}
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actions_to_keyname_map_ = config->input_mappings_; // 获取配置中的输入映射（动作 -> 按键名称）
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scancode_to_actions_map_.clear();
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mouse_button_to_actions_map_.clear();
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action_states_.clear();
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// 如果配置中没有定义鼠标按钮动作(通常不需要配置),则添加默认映射, 用于 UI
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if (actions_to_keyname_map_.find("MouseLeftClick") == actions_to_keyname_map_.end()) {
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spdlog::debug("配置中没有定义 'MouseLeftClick' 动作,添加默认映射到 'MouseLeft'.");
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actions_to_keyname_map_["MouseLeftClick"] = {"MouseLeft"}; // 如果缺失则添加默认映射
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}
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if (actions_to_keyname_map_.find("MouseRightClick") == actions_to_keyname_map_.end()) {
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spdlog::debug("配置中没有定义 'MouseRightClick' 动作,添加默认映射到 'MouseRight'.");
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actions_to_keyname_map_["MouseRightClick"] = {"MouseRight"}; // 如果缺失则添加默认映射
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}
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// 遍历 动作 -> 按键名称 的映射
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for (const auto& [action_name, key_names] : actions_to_keyname_map_) {
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// 每个动作对应一个动作状态，初始化为 INACTIVE
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action_states_[action_name] = ActionState::INACTIVE;
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spdlog::trace("映射动作: {}", action_name);
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// 设置 "按键 -> 动作" 的映射
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for (const std::string& key_name : key_names) {
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SDL_Scancode scancode = scancodeFromString(key_name); // 尝试根据按键名称获取scancode
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Uint8 mouse_button = mouseButtonUint8FromString(key_name); // 尝试根据按键名称获取鼠标按钮
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// 未来可添加其它输入类型 ...
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if (scancode != SDL_SCANCODE_UNKNOWN) { // 如果scancode有效,则将action添加到scancode_to_actions_map_中
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scancode_to_actions_map_[scancode].push_back(action_name);
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spdlog::trace(" 映射按键: {} (Scancode: {}) 到动作: {}", key_name, static_cast<int>(scancode), action_name);
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} else if (mouse_button != 0) { // 如果鼠标按钮有效,则将action添加到mouse_button_to_actions_map_中
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mouse_button_to_actions_map_[mouse_button].push_back(action_name);
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spdlog::trace(" 映射鼠标按钮: {} (Button ID: {}) 到动作: {}", key_name, static_cast<int>(mouse_button), action_name);
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// else if: 未来可添加其它输入类型 ...
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} else {
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spdlog::warn("输入映射警告: 未知键或按钮名称 '{}' 用于动作 '{}'.", key_name, action_name);
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}
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}
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}
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spdlog::trace("输入映射初始化完成.");
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}
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// --- 工具函数 ---
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// 将字符串名称转换为 SDL_Scancode
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SDL_Scancode InputManager::scancodeFromString(const std::string& key_name) {
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return SDL_GetScancodeFromName(key_name.c_str());
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}
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// 将鼠标按钮名称字符串转换为 SDL 按钮 Uint8 值
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Uint8 InputManager::mouseButtonUint8FromString(const std::string& button_name) {
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if (button_name == "MouseLeft") return SDL_BUTTON_LEFT;
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if (button_name == "MouseMiddle") return SDL_BUTTON_MIDDLE;
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if (button_name == "MouseRight") return SDL_BUTTON_RIGHT;
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// SDL 还定义了 SDL_BUTTON_X1 和 SDL_BUTTON_X2
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if (button_name == "MouseX1") return SDL_BUTTON_X1;
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if (button_name == "MouseX2") return SDL_BUTTON_X2;
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return 0; // 0 不是有效的按钮值，表示无效
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}
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void InputManager::updateActionState(const std::string& action_name, bool is_input_active, bool is_repeat_event) {
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auto it = action_states_.find(action_name);
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if (it == action_states_.end()) {
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spdlog::warn("尝试更新未注册的动作状态: {}", action_name);
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return;
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}
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if (is_input_active) { // 输入被激活 (按下)
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if (is_repeat_event) {
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it->second = ActionState::HELD_DOWN;
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} else { // 非重复的按下事件
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it->second = ActionState::PRESSED_THIS_FRAME;
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}
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} else { // 输入被释放 (松开)
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it->second = ActionState::RELEASED_THIS_FRAME;
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}
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}
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} // namespace engine::input
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