实现一个ImGui::BeginCombo()用法的完整代码示例-Go服务器开发

下面是一个使用Dear ImGui库的ImGui::BeginCombo()函数的完整代码示例：

#include <imgui.h>
#include <imgui_impl_glfw.h>
#include <imgui_impl_opengl3.h>
int main()
{
    // 初始化GLFW窗口和OpenGL上下文
    glfwInit();
    GLFWwindow* window = glfwCreateWindow(800, 600, "ImGui BeginCombo示例", nullptr, nullptr);
    glfwMakeContextCurrent(window);
    
    // 初始化Dear ImGui
    IMGUI_CHECKVERSION();
    ImGui::CreateContext();
    ImGuiIO& io = ImGui::GetIO(); (void)io;
    
    // 配置Dear ImGui为在OpenGL3上渲染
    ImGui_ImplGlfw_InitForOpenGL(window, true);
    ImGui_ImplOpenGL3_Init("#version 330");
    
    // 设置样式
    ImGui::StyleColorsDark();
    
    while (!glfwWindowShouldClose(window))
    {
        glfwPollEvents();
        // 开始新的帧，并开始创建GUI元素
        ImGui_ImplOpenGL3_NewFrame();
        ImGui_ImplGlfw_NewFrame();
        ImGui::NewFrame();
        // 创建一个具有下拉选项的Combo Box
        static const char* items[] = { "选项1", "选项2", "选项3" };
        static int currentItem = 0;
        
        if (ImGui::Begin("示例窗口"))
        {
            if (ImGui::BeginCombo("下拉框", items[currentItem]))
            {
                for (int i = 0; i < IM_ARRAYSIZE(items); i++)
                {
                    bool isSelected = (currentItem == i);
                    if (ImGui::Selectable(items[i], isSelected))
                        currentItem = i;
                    if (isSelected)
                        ImGui::SetItemDefaultFocus();
                }
                ImGui::EndCombo();
            }
        }
        ImGui::End();
        // 渲染GUI
        glClearColor(0.45f, 0.55f, 0.60f, 1.00f);
        glClear(GL_COLOR_BUFFER_BIT);
        ImGui::Render();
        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
        glfwSwapBuffers(window);
    }
    // 清理Dear ImGui和GLFW资源
    ImGui_ImplOpenGL3_Shutdown();
    ImGui_ImplGlfw_Shutdown();
    ImGui::DestroyContext();
    glfwDestroyWindow(window);
    glfwTerminate();
    return 0;
}