diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index f81cfeb9..f28a53b6 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -32,6 +32,7 @@ add_executable(cursor cursor.c ${GLAD_GL})
 add_executable(empty WIN32 MACOSX_BUNDLE empty.c ${TINYCTHREAD} ${GLAD_GL})
 add_executable(gamma WIN32 MACOSX_BUNDLE gamma.c ${GLAD_GL})
 add_executable(icon WIN32 MACOSX_BUNDLE icon.c ${GLAD_GL})
+add_executable(input_text WIN32 MACOSX_BUNDLE input_text.c ${GETOPT} ${GLAD_GL})
 add_executable(inputlag WIN32 MACOSX_BUNDLE inputlag.c ${GETOPT} ${GLAD_GL})
 add_executable(joysticks WIN32 MACOSX_BUNDLE joysticks.c ${GLAD_GL})
 add_executable(tearing WIN32 MACOSX_BUNDLE tearing.c ${GLAD_GL})
@@ -48,8 +49,16 @@ if (RT_LIBRARY)
     target_link_libraries(threads "${RT_LIBRARY}")
 endif()
 
-set(GUI_ONLY_BINARIES empty gamma icon inputlag joysticks tearing threads
-    timeout title triangle-vulkan window)
+if (GLFW_BUILD_X11 OR GLFW_BUILD_WAYLAND)
+    find_package(Fontconfig)
+    if (FONTCONFIG_FOUND)
+        target_compile_definitions(input_text PRIVATE FONTCONFIG_ENABLED)
+        target_link_libraries(input_text fontconfig)
+    endif()
+endif()
+
+set(GUI_ONLY_BINARIES empty gamma icon input_text inputlag joysticks tearing
+    threads timeout title triangle-vulkan window)
 set(CONSOLE_BINARIES allocator clipboard events msaa glfwinfo iconify monitors
     reopen cursor)
 
@@ -70,6 +79,7 @@ endif()
 if (APPLE)
     set_target_properties(empty PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Empty Event")
     set_target_properties(gamma PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Gamma")
+    set_target_properties(input_text PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Input Text")
     set_target_properties(inputlag PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Input Lag")
     set_target_properties(joysticks PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Joysticks")
     set_target_properties(tearing PROPERTIES MACOSX_BUNDLE_BUNDLE_NAME "Tearing")
diff --git a/tests/events.c b/tests/events.c
index ab3b99a7..0ea3a957 100644
--- a/tests/events.c
+++ b/tests/events.c
@@ -464,6 +464,59 @@ static void char_callback(GLFWwindow* window, unsigned int codepoint)
            counter++, slot->number, glfwGetTime(), codepoint, string);
 }
 
+static void preedit_callback(GLFWwindow* window, int preeditCount,
+                             unsigned int* preeditString, int blockCount,
+                             int* blockSizes, int focusedBlock, int caret)
+{
+    Slot* slot = glfwGetWindowUserPointer(window);
+    int i, blockIndex = -1, remainingBlockSize = 0;
+    int width, height;
+    char encoded[5] = "";
+    size_t encodedCount = 0;
+    printf("%08x to %i at %0.3f: Preedit text ",
+           counter++, slot->number, glfwGetTime());
+    if (preeditCount == 0 || blockCount == 0)
+    {
+        printf("(empty)\n");
+    }
+    else
+    {
+        for (i = 0; i < preeditCount; i++)
+        {
+            if (remainingBlockSize == 0)
+            {
+                if (blockIndex == focusedBlock)
+                    printf("]");
+                blockIndex++;
+                remainingBlockSize = blockSizes[blockIndex];
+                printf("\n   block %d: ", blockIndex);
+                if (blockIndex == focusedBlock)
+                    printf("[");
+            }
+            if (i == caret)
+                printf("|");
+            encodedCount = encode_utf8(encoded, preeditString[i]);
+            encoded[encodedCount] = '\0';
+            printf("%s", encoded);
+            remainingBlockSize--;
+        }
+        if (blockIndex == focusedBlock)
+            printf("]");
+        if (caret == preeditCount)
+            printf("|");
+        printf("\n");
+        glfwGetWindowSize(window, &width, &height);
+        glfwSetPreeditCursorRectangle(window, width/2, height/2, 1, 20);
+    }
+}
+
+static void ime_callback(GLFWwindow* window)
+{
+    Slot* slot = glfwGetWindowUserPointer(window);
+    printf("%08x to %i at %0.3f: IME switched\n",
+           counter++, slot->number, glfwGetTime());
+}
+
 static void drop_callback(GLFWwindow* window, int count, const char* paths[])
 {
     int i;
@@ -649,6 +702,8 @@ int main(int argc, char** argv)
         glfwSetScrollCallback(slots[i].window, scroll_callback);
         glfwSetKeyCallback(slots[i].window, key_callback);
         glfwSetCharCallback(slots[i].window, char_callback);
+        glfwSetPreeditCallback(slots[i].window, preedit_callback);
+        glfwSetIMEStatusCallback(slots[i].window, ime_callback);
         glfwSetDropCallback(slots[i].window, drop_callback);
 
         glfwMakeContextCurrent(slots[i].window);
diff --git a/tests/input_text.c b/tests/input_text.c
new file mode 100644
index 00000000..3cce0227
--- /dev/null
+++ b/tests/input_text.c
@@ -0,0 +1,781 @@
+//========================================================================
+// Input Test
+// Copyright (c) Camilla Löwy <elmindreda@glfw.org>
+// Copyright (c) Daijiro Fukuda <fukuda@clear-code.com>
+// Copyright (c) Takuro Ashie <ashie@clear-code.com>
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would
+//    be appreciated but is not required.
+//
+// 2. Altered source versions must be plainly marked as such, and must not
+//    be misrepresented as being the original software.
+//
+// 3. This notice may not be removed or altered from any source
+//    distribution.
+//
+//========================================================================
+//
+// For font handiling, I reffered to https://github.com/Immediate-Mode-UI/Nuklear/wiki/Complete-font-guide.
+// For nuklear handling, I reffered to tests/window.c.
+//
+// Currently, it is made for Japanese input only.
+// You have to select the correct font to display Japanese texts.
+// To handle other languages, you need to add correct ranges to nk_font_config.
+// 
+// On X11 or Wayland, you can choose a font by GUI if "fontconfig" libarary is enabled.
+// 
+// On Win32, "Yu Mincho" is selected by default if it is installed. This font is
+// included in the FOD packages, so it will be installed automatically when you
+// enable Japanese input on your environment, or you can install it by
+// "Manage optional features" in "Apps & features".
+// Refer: https://learn.microsoft.com/en-us/typography/fonts/windows_10_font_list#japanese-supplemental-fonts
+// 
+// On macOS, "Arial Unicode MS" is selected by default if it is installed.
+// I assume that this font is usually installed, but if it is not installed,
+// please install it manually.
+// 
+// You can also specify a TTF filepath and use your own favorite font by setting
+// TTF_FONT_FILEPATH below.
+//
+//========================================================================
+
+// Please comment out and set font filepath here to change default font
+// #define TTF_FONT_FILEPATH ""
+
+#define GLAD_GL_IMPLEMENTATION
+#include <glad/gl.h>
+#define GLFW_INCLUDE_NONE
+#include <GLFW/glfw3.h>
+
+#include <stdarg.h>
+
+#define NK_IMPLEMENTATION
+#define NK_INCLUDE_STANDARD_IO
+#define NK_KEYSTATE_BASED_INPUT
+#define NK_INCLUDE_FIXED_TYPES
+#define NK_INCLUDE_FONT_BAKING
+#define NK_INCLUDE_DEFAULT_FONT
+#define NK_INCLUDE_DEFAULT_ALLOCATOR
+#define NK_INCLUDE_VERTEX_BUFFER_OUTPUT
+#define NK_INCLUDE_STANDARD_VARARGS
+#define NK_BUTTON_TRIGGER_ON_RELEASE
+
+// To increase the number of characters that can be entered at one time
+#define NK_INPUT_MAX 64
+
+#include <nuklear.h>
+
+#define NK_GLFW_GL2_IMPLEMENTATION
+#include <nuklear_glfw_gl2.h>
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+
+#include "getopt.h"
+
+#if defined(FONTCONFIG_ENABLED)
+    #include <fontconfig/fontconfig.h>
+#endif
+
+#define MAX_BUFFER_LEN 1024
+
+// https://github.com/Immediate-Mode-UI/Nuklear/wiki/Complete-font-guide
+// https://unicode-table.com
+// To handle other languages, you need to fix these ranges.
+static nk_rune rangesJapan[] = {
+    0x0020, 0x007E, // Basic Latin
+    0x2000, 0x206F, // General Punctuation
+    0x3000, 0x303F, // CJK Symbols and Punctuation
+    0x3041, 0x309F, // Hiragana
+    0x30A0, 0x30FF, // Katakana
+    0x4E00, 0x9FFF, // All Kanji
+    0xFF01, 0xFFEF, // Halfwidth and Fullwidth Forms
+    0
+};
+
+#define MAX_FONTS_LEN 512
+#define MAX_FONT_FAMILY_NAME_LEN 128
+#define MAX_FONT_FILEPATH_LEN 256
+
+static struct nk_font* currentFont;
+static char** fontFamilyNames;
+static char** fontFilePaths;
+static int fontNum = 0;
+static int currentFontIndex = 0;
+
+static int currentIMEStatus = GLFW_FALSE;
+#define MAX_PREEDIT_LEN 128
+static char preeditBuf[MAX_PREEDIT_LEN] = "";
+
+void usage(void)
+{
+    printf("Usage: input_text [-h] [-s]\n");
+    printf("Options:\n");
+    printf("  -s Use on-the-spot sytle on X11. This is ignored on other platforms.\n");
+    printf("  -h Show this help\n");
+}
+
+static size_t encode_utf8(char* s, unsigned int ch)
+{
+    size_t count = 0;
+
+    if (ch < 0x80)
+        s[count++] = (char) ch;
+    else if (ch < 0x800)
+    {
+        s[count++] = (ch >> 6) | 0xc0;
+        s[count++] = (ch & 0x3f) | 0x80;
+    }
+    else if (ch < 0x10000)
+    {
+        s[count++] = (ch >> 12) | 0xe0;
+        s[count++] = ((ch >> 6) & 0x3f) | 0x80;
+        s[count++] = (ch & 0x3f) | 0x80;
+    }
+    else if (ch < 0x110000)
+    {
+        s[count++] = (ch >> 18) | 0xf0;
+        s[count++] = ((ch >> 12) & 0x3f) | 0x80;
+        s[count++] = ((ch >> 6) & 0x3f) | 0x80;
+        s[count++] = (ch & 0x3f) | 0x80;
+    }
+
+    return count;
+}
+
+static int add_font(const char* familyName, const char* ttfFilePath, int checkExistence)
+{
+    if (MAX_FONTS_LEN <= fontNum)
+        return GLFW_FALSE;
+
+    if (MAX_FONT_FAMILY_NAME_LEN <= strlen(familyName) || MAX_FONT_FILEPATH_LEN <= strlen(ttfFilePath))
+        return GLFW_FALSE;
+
+    if (checkExistence)
+    {
+        FILE* fp = fopen(ttfFilePath, "rb");
+        if (!fp)
+            return GLFW_FALSE;
+        fclose(fp);
+    }
+
+    fontFamilyNames[fontNum] = (char*) malloc(1 + strlen(familyName));
+    assert(fontFamilyNames[fontNum]);
+    strcpy(fontFamilyNames[fontNum], familyName);
+
+    fontFilePaths[fontNum] = (char*) malloc(1 + strlen(ttfFilePath));
+    assert(fontFilePaths[fontNum]);
+    strcpy(fontFilePaths[fontNum], ttfFilePath);
+
+    fontNum++;
+
+    return GLFW_TRUE;
+}
+
+static int replace_font(int index, const char* familyName, const char* ttfFilePath, int checkExistence)
+{
+    if (index == 0 || fontNum <= index)
+        return GLFW_FALSE;
+    if (MAX_FONT_FAMILY_NAME_LEN <= strlen(familyName) || MAX_FONT_FILEPATH_LEN <= strlen(ttfFilePath))
+        return GLFW_FALSE;
+
+    if (checkExistence)
+    {
+        FILE* fp = fopen(ttfFilePath, "rb");
+        if (!fp)
+            return GLFW_FALSE;
+        fclose(fp);
+    }
+
+    free(fontFamilyNames[index]);
+    free(fontFilePaths[index]);
+
+    fontFamilyNames[index] = (char*) malloc(1 + strlen(familyName));
+    assert(fontFamilyNames[index]);
+    strcpy(fontFamilyNames[index], familyName);
+
+    fontFilePaths[index] = (char*) malloc(1 + strlen(ttfFilePath));
+    assert(fontFilePaths[index]);
+    strcpy(fontFilePaths[index], ttfFilePath);
+
+    return GLFW_TRUE;
+}
+
+#if defined(TTF_FONT_FILEPATH)
+static int load_custom_font()
+{
+    if (MAX_FONTS_LEN <= fontNum)
+        return GLFW_FALSE;
+    if (!(TTF_FONT_FILEPATH && *TTF_FONT_FILEPATH))
+        return GLFW_FALSE;
+
+    return add_font("Custom", TTF_FONT_FILEPATH, GLFW_TRUE);
+}
+#endif
+
+#if defined(FONTCONFIG_ENABLED)
+static void load_font_list_by_fontconfig()
+{
+    FcConfig* config = FcInitLoadConfigAndFonts();
+    FcFontSet* fontset = FcConfigGetFonts(config, FcSetSystem);
+
+    if (!fontset)
+    {
+        printf("load_font_list_by_fontconfig failed.\n");
+        FcConfigDestroy(config);
+        return;
+    }
+
+    for (int i = 0; i < fontset->nfont; i++)
+    {
+        FcValue fvalue, dvalue;
+        if (FcResultMatch == FcPatternGet(fontset->fonts[i], FC_FAMILY, 0, &fvalue))
+        {
+            if (FcResultMatch == FcPatternGet(fontset->fonts[i], FC_FILE, 0, &dvalue))
+            {
+                const char* familyName = (const char*) fvalue.u.s;
+                const char* filePath = (const char*) dvalue.u.s;
+                int existsFamily = GLFW_FALSE;
+                int existingIndex = 0;
+
+                if (!strstr(filePath, ".ttf"))
+                {
+                    continue;
+                }
+
+                for (int j = 1; j < fontNum; ++j)
+                {
+                    if (strcmp(fontFamilyNames[j], familyName) == 0)
+                    {
+                        existsFamily = GLFW_TRUE;
+                        existingIndex = j;
+                        break;
+                    }
+                }
+
+                if (existsFamily)
+                {
+                    // Prefer "regular" to the others.
+                    if (strstr(filePath, "regular") || strstr(filePath, "Regular"))
+                        replace_font(existingIndex, familyName, filePath, GLFW_FALSE);
+                }
+                else
+                    add_font(familyName, filePath, GLFW_FALSE);
+
+                if (MAX_FONTS_LEN <= fontNum)
+                {
+                    printf("MAX_FONTS_LEN reached. Could not load some fonts.\n");
+                    break;
+                }
+            }
+        }
+    }
+
+    FcConfigDestroy(config);
+}
+#endif
+
+static void load_default_font_for_each_platform()
+{
+    int hasSucceeded = GLFW_FALSE;
+    if (MAX_FONTS_LEN <= fontNum)
+        return;
+
+    if (glfwGetPlatform() == GLFW_PLATFORM_COCOA)
+        hasSucceeded = add_font("Arial Unicode MS", "/Library/Fonts/Arial Unicode.ttf", GLFW_TRUE);
+    else if(glfwGetPlatform() == GLFW_PLATFORM_WIN32)
+    {
+        // Use "Yu Mincho" since it is the only TTF for Japanese in the FOD packages on Windows10 and Windows11.
+        // https://learn.microsoft.com/en-us/typography/fonts/windows_10_font_list#japanese-supplemental-fonts
+        char filepath[MAX_FONT_FILEPATH_LEN];
+        char* winDir = getenv("systemroot");
+        if (winDir)
+            snprintf(filepath, MAX_FONT_FILEPATH_LEN, "%s\\Fonts\\Yumin.ttf", winDir);
+        else
+            strcpy(filepath, "C:\\Windows\\Fonts\\Yumin.ttf");
+        hasSucceeded = add_font("Yu Mincho Regular", filepath, GLFW_TRUE);
+    }
+
+    if (hasSucceeded)
+        currentFontIndex = fontNum - 1;
+}
+
+static void init_font_list()
+{
+    int useCustomFont = GLFW_FALSE;
+    int customFontIndex = 0;
+
+    fontFamilyNames = (char**) malloc(sizeof(char*) * MAX_FONTS_LEN);
+    assert(fontFamilyNames);
+    fontFilePaths = (char**) malloc(sizeof(char*) * MAX_FONTS_LEN);
+    assert(fontFilePaths);
+
+    fontFamilyNames[0] = "GLFW default";
+    fontFilePaths[0] = "";
+    fontNum++;
+
+#if defined(TTF_FONT_FILEPATH)
+    useCustomFont = load_custom_font();
+    if (useCustomFont)
+        customFontIndex = fontNum - 1;
+#endif
+
+    load_default_font_for_each_platform();
+
+#if defined(FONTCONFIG_ENABLED)
+    load_font_list_by_fontconfig();
+#endif
+
+    if (useCustomFont)
+        currentFontIndex = customFontIndex;
+}
+
+static void deinit_font_list()
+{
+    for (int i = 1; i < fontNum; ++i)
+    {
+        free(fontFamilyNames[i]);
+        free(fontFilePaths[i]);
+    }
+
+    free(fontFamilyNames);
+    free(fontFilePaths);
+}
+
+// https://github.com/Immediate-Mode-UI/Nuklear/wiki/Complete-font-guide
+static void update_font(struct nk_context* nk, float height)
+{
+    struct nk_font_atlas* atlas;
+
+    nk_glfw3_font_stash_begin(&atlas);
+
+    if (currentFontIndex == 0)
+    {
+        currentFont = nk_font_atlas_add_default(atlas, height, 0);
+    }
+    else
+    {
+        struct nk_font* new_font;
+        struct nk_font_config cfg;
+        cfg = nk_font_config(0);
+        cfg.range = rangesJapan;
+        cfg.oversample_h = 1;
+        cfg.oversample_v = 1;
+        cfg.pixel_snap = true;
+
+        new_font = nk_font_atlas_add_from_file(atlas, fontFilePaths[currentFontIndex], height, &cfg);
+        if (new_font)
+        {
+            currentFont = new_font;
+            printf("Succeeded to load font file: %s\n", fontFilePaths[currentFontIndex]);
+        }
+        else
+            printf("Failed to load font file: %s\n", fontFilePaths[currentFontIndex]);
+    }
+
+    nk_glfw3_font_stash_end();
+    nk_style_set_font(nk, &currentFont->handle);
+}
+
+static void set_menu_buttons(GLFWwindow* window, struct nk_context* nk, int height)
+{
+    static int windowedX, windowedY, windowedWidth, windowedHeight;
+
+    nk_layout_row_dynamic(nk, height, 2);
+    if (nk_button_label(nk, "Toggle Fullscreen"))
+    {
+        if (glfwGetWindowMonitor(window))
+        {
+            glfwSetWindowMonitor(window, NULL,
+                                 windowedX, windowedY,
+                                 windowedWidth, windowedHeight, 0);
+        }
+        else
+        {
+            GLFWmonitor* monitor = glfwGetPrimaryMonitor();
+            const GLFWvidmode* mode = glfwGetVideoMode(monitor);
+            glfwGetWindowPos(window, &windowedX, &windowedY);
+            glfwGetWindowSize(window, &windowedWidth, &windowedHeight);
+            glfwSetWindowMonitor(window, monitor,
+                                 0, 0, mode->width, mode->height,
+                                 mode->refreshRate);
+        }
+    }
+
+    {
+        int auto_iconify = glfwGetWindowAttrib(window, GLFW_AUTO_ICONIFY);
+        if (nk_checkbox_label(nk, "Auto Iconify", &auto_iconify))
+            glfwSetWindowAttrib(window, GLFW_AUTO_ICONIFY, auto_iconify);
+    }
+}
+
+static int set_font_selecter(GLFWwindow* window, struct nk_context* nk, int height, int fontHeight)
+{
+    int newSelectedIndex;
+
+    nk_layout_row_begin(nk, NK_DYNAMIC, height, 2);
+
+    nk_layout_row_push(nk, 1.f / 3.f);
+    nk_label(nk, "Font", NK_TEXT_LEFT);
+
+    nk_layout_row_push(nk, 2.f / 3.f);
+    newSelectedIndex = nk_combo(nk, (const char**) fontFamilyNames, fontNum, currentFontIndex, fontHeight, nk_vec2(300, 400));
+
+    nk_layout_row_end(nk);
+
+    if (newSelectedIndex == currentFontIndex)
+        return GLFW_FALSE;
+
+    currentFontIndex = newSelectedIndex;
+    return GLFW_TRUE;
+}
+
+static void set_ime_buttons(GLFWwindow* window, struct nk_context* nk, int height)
+{
+    nk_layout_row_dynamic(nk, height, 2);
+
+    if (nk_button_label(nk, "Toggle IME status"))
+    {
+        glfwSetInputMode(window, GLFW_IME, !currentIMEStatus);
+    }
+
+    if (nk_button_label(nk, "Reset preedit text"))
+    {
+        glfwResetPreeditText(window);
+    }
+}
+
+static void set_preedit_cursor_edit(GLFWwindow* window, struct nk_context* nk, int height, int* isAutoUpdating)
+{
+    static int lastX = -1, lastY = -1, lastW = -1, lastH = -1;
+    static char xBuf[12] = "", yBuf[12] = "", wBuf[12] = "", hBuf[12] = "";
+
+    const nk_flags flags = NK_EDIT_FIELD |
+                           NK_EDIT_SIG_ENTER |
+                           NK_EDIT_GOTO_END_ON_ACTIVATE;
+    nk_flags events;
+    int x, y, w, h;
+
+    glfwGetPreeditCursorRectangle(window, &x, &y, &w, &h);
+
+    if (x != lastX)
+        sprintf(xBuf, "%i", x);
+    if (y != lastY)
+        sprintf(yBuf, "%i", y);
+    if (w != lastW)
+        sprintf(wBuf, "%i", w);
+    if (h != lastH)
+        sprintf(hBuf, "%i", h);
+
+    nk_layout_row_begin(nk, NK_DYNAMIC, height, 5);
+
+    nk_layout_row_push(nk, 4.f / 9.f);
+    nk_label(nk, "Preedit cursor (x,y,w,h)", NK_TEXT_LEFT);
+
+    nk_layout_row_push(nk, 1.f / 9.f);
+    events = nk_edit_string_zero_terminated(nk, flags, xBuf,
+                                            sizeof(xBuf),
+                                            nk_filter_decimal);
+    if (events & NK_EDIT_COMMITED)
+    {
+        x = atoi(xBuf);
+        *isAutoUpdating = GLFW_FALSE;
+        glfwSetPreeditCursorRectangle(window, x, y, w, h);
+    }
+    else if (events & NK_EDIT_DEACTIVATED)
+        sprintf(xBuf, "%i", x);
+
+    nk_layout_row_push(nk, 1.f / 9.f);
+    events = nk_edit_string_zero_terminated(nk, flags, yBuf,
+                                            sizeof(yBuf),
+                                            nk_filter_decimal);
+    if (events & NK_EDIT_COMMITED)
+    {
+        y = atoi(yBuf);
+        *isAutoUpdating = GLFW_FALSE;
+        glfwSetPreeditCursorRectangle(window, x, y, w, h);
+    }
+    else if (events & NK_EDIT_DEACTIVATED)
+        sprintf(yBuf, "%i", y);
+
+    nk_layout_row_push(nk, 1.f / 9.f);
+    events = nk_edit_string_zero_terminated(nk, flags, wBuf,
+                                            sizeof(wBuf),
+                                            nk_filter_decimal);
+    if (events & NK_EDIT_COMMITED)
+    {
+        w = atoi(wBuf);
+        *isAutoUpdating = GLFW_FALSE;
+        glfwSetPreeditCursorRectangle(window, x, y, w, h);
+    }
+    else if (events & NK_EDIT_DEACTIVATED)
+        sprintf(wBuf, "%i", w);
+
+    nk_layout_row_push(nk, 1.f / 9.f);
+    events = nk_edit_string_zero_terminated(nk, flags, hBuf,
+                                            sizeof(hBuf),
+                                            nk_filter_decimal);
+    if (events & NK_EDIT_COMMITED)
+    {
+        h = atoi(hBuf);
+        *isAutoUpdating = GLFW_FALSE;
+        glfwSetPreeditCursorRectangle(window, x, y, w, h);
+    }
+    else if (events & NK_EDIT_DEACTIVATED)
+        sprintf(hBuf, "%i", h);
+
+    nk_layout_row_push(nk, 1.f / 9.f);
+    nk_checkbox_label(nk, "Auto", isAutoUpdating);
+
+    nk_layout_row_end(nk);
+
+    lastX = x;
+    lastY = y;
+    lastW = w;
+    lastH = h;
+}
+
+static void set_ime_stauts_labels(GLFWwindow* window, struct nk_context* nk, int height)
+{
+    nk_layout_row_dynamic(nk, height, 1);
+    nk_value_bool(nk, "IME status", currentIMEStatus);
+}
+
+static void set_preedit_labels(GLFWwindow* window, struct nk_context* nk, int height)
+{
+    nk_layout_row_begin(nk, NK_DYNAMIC, height, 5);
+
+    nk_layout_row_push(nk, 1.f / 3.f);
+    nk_label(nk, "Preedit info:", NK_TEXT_LEFT);
+
+    nk_layout_row_push(nk, 2.f / 3.f);
+    nk_label(nk, (const char*) preeditBuf, NK_TEXT_LEFT);
+
+    nk_layout_row_end(nk);
+}
+
+// If it is possible to take the text-cursor position calculated in `nk_do_edit` function in `deps/nuklear.h`,
+// we can set preedit-cursor position more easily.
+// However, there doesn't seem to be a way to do that, so this does a simplified calculation only for the end
+// of the text. (Can not trace the cursor movement)
+static void update_cursor_pos(GLFWwindow* window, struct nk_context* nk, struct nk_user_font* f, char* boxBuffer, int boxLen)
+{
+    float lineWidth = 0;
+    int totalLines = 1;
+
+    const char* text;
+    int textPos = 0;
+
+    struct nk_str nkString;
+    nk_str_init_fixed(&nkString, boxBuffer, (nk_size) MAX_BUFFER_LEN);
+    nkString.buffer.allocated = (nk_size) boxLen;
+    nkString.len = nk_utf_len(boxBuffer, boxLen);
+
+    text = nk_str_get_const(&nkString);
+
+    while (textPos < boxLen)
+    {
+        nk_rune unicode = 0;
+        int remainedBoxLen = boxLen - textPos;
+        int nextGlyphSize = nk_utf_decode(text + textPos, &unicode, remainedBoxLen);
+        if (!nextGlyphSize)
+            break;
+
+        if (unicode == '\n')
+        {
+            textPos++;
+            totalLines++;
+            lineWidth = 0;
+            continue;
+        }
+
+        textPos += nextGlyphSize;
+        lineWidth += f->width(f->userdata, f->height, text + textPos, nextGlyphSize);
+    }
+
+    {
+        // I don't know how to get these info.
+        int widgetLayoutX = 10;
+        int widgetLayoutY = 220;
+
+        int lineHeight = f->height + nk->style.edit.row_padding;
+
+        int cursorPosX = widgetLayoutX + lineWidth;
+        int cursorPosY = widgetLayoutY + lineHeight * (totalLines - 1);
+        int cursorHeight = lineHeight;
+        int cursorWidth;
+
+        // Keep the value of width since it doesn't need to be updated.
+        glfwGetPreeditCursorRectangle(window, NULL, NULL, &cursorWidth, NULL);
+
+        glfwSetPreeditCursorRectangle(window, cursorPosX, cursorPosY, cursorWidth, cursorHeight);
+    }
+}
+
+static void ime_callback(GLFWwindow* window)
+{
+    currentIMEStatus = glfwGetInputMode(window, GLFW_IME);
+    printf("IME switched: %s\n", currentIMEStatus ? "ON" : "OFF");
+}
+
+static void preedit_callback(GLFWwindow* window, int preeditCount,
+                             unsigned int* preeditString, int blockCount,
+                             int* blockSizes, int focusedBlock, int caret)
+{
+    int blockIndex = -1, remainingBlockSize = 0;
+    if (preeditCount == 0 || blockCount == 0)
+    {
+        strcpy(preeditBuf, "(empty)");
+        return;
+    }
+
+    strcpy(preeditBuf, "");
+
+    for (int i = 0; i < preeditCount; i++)
+    {
+        char encoded[5] = "";
+        size_t encodedCount = 0;
+
+        if (i == caret)
+        {
+            if (strlen(preeditBuf) + strlen("|") < MAX_PREEDIT_LEN)
+                strcat(preeditBuf, "|");
+        }
+        if (remainingBlockSize == 0)
+        {
+            if (blockIndex == focusedBlock)
+            {
+                if (strlen(preeditBuf) + strlen("]") < MAX_PREEDIT_LEN)
+                    strcat(preeditBuf, "]");
+            }
+            blockIndex++;
+            remainingBlockSize = blockSizes[blockIndex];
+            if (blockIndex == focusedBlock)
+            {
+                if (strlen(preeditBuf) + strlen("[") < MAX_PREEDIT_LEN)
+                    strcat(preeditBuf, "[");
+            }
+        }
+        encodedCount = encode_utf8(encoded, preeditString[i]);
+        encoded[encodedCount] = '\0';
+        if (strlen(preeditBuf) + strlen(encoded) < MAX_PREEDIT_LEN)
+            strcat(preeditBuf, encoded);
+        remainingBlockSize--;
+    }
+    if (blockIndex == focusedBlock)
+    {
+        if (strlen(preeditBuf) + strlen("]") < MAX_PREEDIT_LEN)
+            strcat(preeditBuf, "]");
+    }
+    if (caret == preeditCount)
+    {
+        if (strlen(preeditBuf) + strlen("|") < MAX_PREEDIT_LEN)
+            strcat(preeditBuf, "|");
+    }
+}
+
+int main(int argc, char** argv)
+{
+    GLFWwindow* window;
+    struct nk_context* nk;
+    int width, height;
+    char boxBuffer[MAX_BUFFER_LEN] = "Input text here.";
+    int boxLen = strlen(boxBuffer);
+    int isAutoUpdatingCursorPosEnabled = GLFW_TRUE;
+    int ch;
+
+    while ((ch = getopt(argc, argv, "hs")) != -1)
+    {
+        switch (ch)
+        {
+            case 'h':
+                usage();
+                exit(EXIT_SUCCESS);
+
+            case 's':
+                glfwInitHint(GLFW_X11_ONTHESPOT, GLFW_TRUE);
+                break;
+        }
+    }
+
+    if (!glfwInit())
+        exit(EXIT_FAILURE);
+
+    glfwWindowHint(GLFW_SCALE_TO_MONITOR, GLFW_TRUE);
+    glfwWindowHint(GLFW_WIN32_KEYBOARD_MENU, GLFW_TRUE);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
+
+    window = glfwCreateWindow(600, 600, "Input Text", NULL, NULL);
+    if (!window)
+    {
+        glfwTerminate();
+        exit(EXIT_FAILURE);
+    }
+
+    currentIMEStatus = glfwGetInputMode(window, GLFW_IME);
+    glfwSetPreeditCursorRectangle(window, 0, 0, 1, 1);
+    glfwSetIMEStatusCallback(window, ime_callback);
+    glfwSetPreeditCallback(window, preedit_callback);
+
+    glfwMakeContextCurrent(window);
+    gladLoadGL(glfwGetProcAddress);
+    glfwSwapInterval(0);
+
+    nk = nk_glfw3_init(window, NK_GLFW3_INSTALL_CALLBACKS);
+    init_font_list();
+    update_font(nk, 18);
+
+    while (!glfwWindowShouldClose(window))
+    {
+        struct nk_rect area;
+
+        glfwGetWindowSize(window, &width, &height);
+
+        area = nk_rect(0.f, 0.f, (float) width, (float) height);
+        nk_window_set_bounds(nk, "main", area);
+
+        nk_glfw3_new_frame();
+        if (nk_begin(nk, "main", area, 0))
+        {
+            set_menu_buttons(window, nk, 30);
+            if (set_font_selecter(window, nk, 30, 18))
+                update_font(nk, 18);
+            set_ime_buttons(window, nk, 30);
+            set_preedit_cursor_edit(window, nk, 30, &isAutoUpdatingCursorPosEnabled);
+            set_ime_stauts_labels(window, nk, 30);
+            set_preedit_labels(window, nk, 30);
+
+            nk_layout_row_dynamic(nk, height - 250, 1);
+            nk_edit_string(nk, NK_EDIT_BOX, boxBuffer, &boxLen, MAX_BUFFER_LEN, nk_filter_default);
+        }
+        nk_end(nk);
+
+        glClear(GL_COLOR_BUFFER_BIT);
+        nk_glfw3_render(NK_ANTI_ALIASING_ON);
+        glfwSwapBuffers(window);
+
+        if (isAutoUpdatingCursorPosEnabled)
+            update_cursor_pos(window, nk, &currentFont->handle, boxBuffer, boxLen);
+
+        glfwWaitEvents();
+    }
+
+    deinit_font_list();
+
+    nk_glfw3_shutdown();
+    glfwTerminate();
+    exit(EXIT_SUCCESS);
+}