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Nuklear 是一个 C 编写的、只有头文件的 GUI 界面库，

也是 IMGUI (Immediate Mode User Interface) 类的界面实现工具，

支持多种渲染后端，包括 gdi/gdi+/D3D/X11/Xft/SDL/opengl 等，本文实现了 EasyX 的后端渲染。

Nuklear 实现常用控件：

Input TextBox Button Popup CheckBox Combo Selection 等等。

示例 Demo 展示：

对应项目文件夹下 /demo/common/xxxx.c 具体实现，取消相应的注释即可运行文档中 demo 示例程序。

/* ===============================================================
 *
 *				打开相应的注释，可以运行不同的示例
 *
 * ===============================================================*/
//#define INCLUDE_ALL 
#define INCLUDE_STYLE 
#define INCLUDE_CALCULATOR 
//#define INCLUDE_CANVAS 
#define INCLUDE_OVERVIEW
#define INCLUDE_CONFIGURATOR 
//#define INCLUDE_NODE_EDITOR 

完整示例代码：

/********** 摘自文档 **********/
#define _CRT_SECURE_NO_WARNINGS
#define WIN32_LEAN_AND_MEAN
#define NK_INCLUDE_FIXED_TYPES				// 这个宏会引入 <stdint.h> 以帮助 nuklear 使用正确的数据类型
// nuklear 的设计目标是适配所有平台，以上几个宏是控制 nuklear 特性和行为的
// 不同平台基本数据类型大小不一样，指针长度不一样
// 有些平台(例如嵌入式)不提供 IO 功能，或者使用者希望 nuklear context 使用固定分配的内存等各种特殊需求
// 在 PC 平台上定义以上几个宏几乎是标准动作
#pragma warning(disable:4996)				// nuklear 需要使用新版本 VS 默认禁止的 vsprintf 等旧版 C 函数
#pragma execution_character_set("utf-8")	// VS 需要设定执行字符集为 utf8 格式，否则非英文字符会乱码
/********** 摘自文档 - End **********/


#include <windows.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <math.h>
#include <limits.h>
#include <Shlobj.h>

#define WINDOW_WIDTH 800
#define WINDOW_HEIGHT 600

#define NK_INCLUDE_FIXED_TYPES
#define NK_INCLUDE_STANDARD_IO
#define NK_INCLUDE_STANDARD_VARARGS
#define NK_INCLUDE_DEFAULT_ALLOCATOR
#define NK_IMPLEMENTATION
#define NK_EASYX_IMPLEMENTATION
#include "../nuklear.h"
#include "nuklear_easyx.h"

/* ===============================================================
 *
 *				打开相应的注释，可以运行不同的示例
 *
 * ===============================================================*/
//#define INCLUDE_ALL 
#define INCLUDE_STYLE 
#define INCLUDE_CALCULATOR 
//#define INCLUDE_CANVAS 
#define INCLUDE_OVERVIEW
#define INCLUDE_CONFIGURATOR 
//#define INCLUDE_NODE_EDITOR 

#ifdef INCLUDE_ALL
  #define INCLUDE_STYLE
  #define INCLUDE_CALCULATOR
  #define INCLUDE_CANVAS
  #define INCLUDE_OVERVIEW
  #define INCLUDE_CONFIGURATOR
  #define INCLUDE_NODE_EDITOR
#endif

#ifdef INCLUDE_STYLE
  #include "../demo/common/style.c"
#endif
#ifdef INCLUDE_CALCULATOR
  #include "../demo/common/calculator.c"
#endif
#ifdef INCLUDE_CANVAS
  #include "../demo/common/canvas.c"
#endif
#ifdef INCLUDE_OVERVIEW
  #include "../demo/common/overview.c"
#endif
#ifdef INCLUDE_CONFIGURATOR
  #include "../demo/common/style_configurator.c"
#endif
#ifdef INCLUDE_NODE_EDITOR
  #include "../demo/common/node_editor.c"
#endif

int main(void)
{
    EasyXFont* font;
    struct nk_context *ctx;

    HWND wnd;
    HDC dc;
    int running = 1;
    int needs_refresh = 1;

    #ifdef INCLUDE_CONFIGURATOR
    static struct nk_color color_table[NK_COLOR_COUNT];
    memcpy(color_table, nk_default_color_style, sizeof(color_table));
    #endif

	initgraph(900 , 700);
	wnd = GetHWnd();
	dc = GetDC(wnd);
	HDC ddc = GetImageHDC();

    font = nk_easyxfont_create("Consolas", 16);
    ctx = nk_easyx_init(font, dc, WINDOW_WIDTH, WINDOW_HEIGHT);

	BeginBatchDraw();
    while (running)
    {
		Sleep(10);

        ExMessage msg;
        nk_input_begin(ctx);
        if (needs_refresh == 0) {
			msg = getmessage();
            if (msg.message == WM_QUIT)
                running = 0;
            else
				nk_easyx_handle_event(wnd, &msg);
            
            needs_refresh = 1;
        }
		else
			needs_refresh = 0;

        while (peekmessage(&msg)) {
            if (msg.message == WM_QUIT)
                running = 0;
			nk_easyx_handle_event(wnd, &msg);
            needs_refresh = 1;
        }
        nk_input_end(ctx);

        if (nk_begin(ctx, "Demo", nk_rect(50, 50, 200, 200),
            NK_WINDOW_BORDER|NK_WINDOW_MOVABLE|NK_WINDOW_SCALABLE|
            NK_WINDOW_CLOSABLE|NK_WINDOW_MINIMIZABLE|NK_WINDOW_TITLE))
        {
            enum {EASY, HARD};
            static int op = EASY;
            static int property = 20;

            nk_layout_row_static(ctx, 30, 80, 2);
			if (nk_button_label(ctx, "button")) {
				fprintf(stdout, "button pressed\n");
			}

            nk_layout_row_dynamic(ctx, 30, 2);
            if (nk_option_label(ctx, "easy", op == EASY)) op = EASY;
            if (nk_option_label(ctx, "hard", op == HARD)) op = HARD;

            nk_layout_row_dynamic(ctx, 22, 1);
            nk_property_int(ctx, "Compression:", 0, &property, 100, 10, 1);
        }
        nk_end(ctx);

        /* -------------- EXAMPLES 摘自文档 ---------------- */
        #ifdef INCLUDE_CALCULATOR
          calculator(ctx);
        #endif
        #ifdef INCLUDE_CANVAS
          canvas(ctx);
        #endif
        #ifdef INCLUDE_OVERVIEW
          overview(ctx);
        #endif
        #ifdef INCLUDE_CONFIGURATOR
          style_configurator(ctx, color_table);
        #endif
        #ifdef INCLUDE_NODE_EDITOR
          node_editor(ctx);
        #endif
        /* --------------- EXAMPLES END -------------------------- */

		nk_easyx_render(nk_rgb(30,30,30));
		FlushBatchDraw();
    }

	EndBatchDraw();

    nk_easyxfont_del(font);
    ReleaseDC(wnd, dc);
	closegraph();
    return 0;
}

完整项目文件下载：

NuklearEasyX