JavaScript bindings for Dear ImGui using Emscripten and TypeScript
ImGui JavaScript+WebGL example
The original Dear ImGui demo code from imgui_demo.cpp has been ported to imgui_demo.ts. Also, the Memory Editor from the imgui_club project (imgui_memory_editor.h) has been ported to imgui_memory_editor.ts and added to the demo for browsing the Emscripten memory space.
A CodePen using the Ace editor to live-edit a window.
ImGui JavaScript+Three.js example
A CodePen using Dear ImGui with Three.js.
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All functions in the C++ ImGui namespace are exported at the top level of the module.
import * as ImGui from "imgui-js";Individual exports can be imported as well.
import { ImVec2 } from "imgui-js";In general, functions that take an address of a variable in C++ have been changed to take an access function in JavaScript. Calling the access function with no arguments returns the variable, calling with a value sets the variable.
type ImAccess<T> = (value?: T) => T;
let show: boolean = true;
const _show: ImAccess<boolean> = (_: boolean = show): boolean => show = _;
// get the value of show
console.log(_show()); // true
// set the value of show to false (also returns the updated value)
console.log(_show(false)); // falseIn the following example, the address of show in the C++ code has been replaced with an inline arrow access function.
#include "imgui.h"
bool show = true;
void draw() {
if (ImGui::Button("Toggle")) { show = !show; }
if (show) {
ImGui::Begin("My Window", &show, ImGuiWindowFlags_AlwaysAutoResize));
ImGui::Text("Hello, World!");
ImGui::End();
}
}import * as ImGui from "imgui-js";
let show: boolean = true;
function draw(): void {
if (ImGui.Button("Toggle")) { show = !show; }
if (show) {
ImGui.Begin("My Window", (_ = show) => show = _, ImGui.WindowFlags.AlwaysAutoResize));
ImGui.Text("Hello, World!");
ImGui.End();
}
}Enumerations that begin with ImGui* are also exported with ImGui removed. So the following examples are equivalent.
import * as ImGui from "imgui-js";
const flags: ImGui.WindowFlags = ImGui.WindowFlags.AlwaysAutoResize;import { ImGuiWindowFlags } from "imgui-js";
const flags: ImGuiWindowFlags = ImGuiWindowFlags.AlwaysAutoResize;In order to minimize size of the output, the C++ library has been compiled with IMGUI_DISABLE_OBSOLETE_FUNCTIONS and IMGUI_DISABLE_DEMO_WINDOWS.
git clone git@github.com:flyover/imgui-js.gitcd imgui-jsgit submodule update --init --recursive- download and install Emscripten
npm installmakemake start-example-html
- file I/O, imgui.ini, loading external fonts
- implement ImGuiTextFilter (add support for JavaScript RegExp's)
- implement ImGuiTextBuffer (simplify to array of strings)
- fill in remainder of any missing API
- automate the Emscripten install and environment setup in npm install
imgui-js is licensed under the MIT License, see LICENSE for more information.