给我写一个包括触屏窗口和按钮的示例

在C++和SDL2中，为了创建一个带触屏窗口和按钮的简单示例，你需要先确保已经包含了必要的库并设置了基本的窗口初始化。以下是一个简单的例子，演示了如何创建一个窗口，添加一个触摸区域响应点击事件以及创建一个按钮：

#include <SDL2/SDL.h>
#include <vector>

// 定义触摸区域和按钮的结构体
struct TouchArea {
    int x, y;
};

struct Button {
    int left, top, width, height;
    std::string label;
};

class TouchWindow {
public:
    TouchWindow(int windowWidth, int windowHeight)
        : m_window(NULL), m_events(50) {}

    void createWindow(std::string title) {
        SDL_Init(SDL_INIT_VIDEO);
        m_window = SDL_CreateWindow(title.c_str(), SDL_WINDOWPOS_UNDEFINED,
                                    SDL_WINDOWPOS_UNDEFINED, windowWidth, windowHeight,
                                    SDL_WINDOW_INPUT_TOUCH | SDL_WINDOW_RESIZABLE);
    }

    bool onTouch(TouchArea touch) {
        for (auto& button : buttons) {
            if (touch.x >= button.left && touch.x <= button.left + button.width &&
                touch.y >= button.top && touch.y <= button.top + button.height) {
                // 打印按钮点击事件
                printf("Button '%s' clicked at (%d, %d)\n", button.label.c_str(), touch.x, touch.y);
                return true;
            }
        }
        return false;
    }

private:
    SDL_Window* m_window;
    std::vector<Button> buttons;
    SDL_Event m_events;

    // 添加更多事件处理函数，如SDL_FingerDown和SDL_FingerUp，以跟踪触控状态
};

int main() {
    TouchWindow window(640, 480);
    window.createWindow("Touch Test");

    // 创建按钮示例
    Button button1 {"Button 1", 100, 100, 100, "Click me"};
    buttons.push_back(button1);

    while (true) {
        SDL_PollEvent(&window.m_events);
        for (const auto& event : window.m_events) {
            if (event.type == SDL_FINGERDOWN) {
                TouchArea touch = {event.tfinger.x, event.tfinger.y};
                if (window.onTouch(touch)) break; // 如果找到匹配的按钮就跳出循环
            } else if (event.type == SDL_QUIT) {
                break;
            }
        }
    }

    SDL_DestroyWindow(window.m_window);
    SDL_Quit();

    return 0;
}