trgui: minimalist and independent gui crate

Inspired by IMGUIs, MLIB (AzPainter) and Love2D

What trgui has?

• Generic Widget trait for easy integration with rendering contexts and point types
• Containers for dispatch function calls to Widget trait objects.
• Focus, Grab, Hover handling.
• Layouts and Decorators for Containers.
• RefProxy for share external data to widgets. (this is unsafe, You can use Rc<RefCell<T>> instead)
• Groups for communication between widgets based on IDs.

Goals of trgui

• Extremely flexible with other crates like path renderers, window managers, etc.
• Very fast performance with very low memory and CPU usage.
• Easy to understand and maintain
• No dependencies

Limitations

• You aren't able to remove or modify widgets directly from Containers after moving it. Its better create a SoA widget than a widget for each data.
• Focus can't be modified by update and hover_out

What trgui doesn't have?

• Renderer
• Window Handling
• Main Loop
• Default Widgets

You need implement those by yourself or from other crates.

Examples

• Calculator with sdl2: https://www.youtube.com/watch?v=ybhRPkA7wtI