A tiny, portable, immediate-mode UI library written in ANSI C.

This repository contains a RISC OS port which works well enough for the demo to function. The releases of this version of the library contain the demo executable and built versions of the MicroUI and GContext libraries used to build it.

• Tiny: around 1100 sloc of ANSI C
• Works within a fixed-sized memory region: no additional memory is allocated
• Built-in controls: window, scrollable panel, button, slider, textbox, label, checkbox, wordwrapped text
• Works with any rendering system that can draw rectangles and text
• Designed to allow the user to easily add custom controls
• Simple layout system

if (mu_begin_window(ctx, "My Window", mu_rect(10, 10, 140, 86))) {
  mu_layout_row(ctx, 2, (int[]) { 60, -1 }, 0);

  mu_label(ctx, "First:");
  if (mu_button(ctx, "Button1")) {
    printf("Button1 pressed\n");
  }

  mu_label(ctx, "Second:");
  if (mu_button(ctx, "Button2")) {
    mu_open_popup(ctx, "My Popup");
  }

  if (mu_begin_popup(ctx, "My Popup")) {
    mu_label(ctx, "Hello world!");
    mu_end_popup(ctx);
  }

  mu_end_window(ctx);
}

Browser Demo

• See doc/usage.md for usage instructions
• See the demo directory for a usage example

The library expects the user to provide input and handle the resultant drawing commands, it does not do any drawing itself.

The library is designed to be lightweight, providing a foundation to which you can easily add custom controls and UI elements; pull requests adding additional features will likely not be merged. Bug reports are welcome.

This library is free software; you can redistribute it and/or modify it under the terms of the MIT license. See LICENSE for details.