uing - a fork of ui that wraps libui-ng instead of libui

[neroist]

Hi everyone!

I created a fork of [ui](https://github.com/nim-lang/ui) that wraps 
[libui-ng](https://github.com/libui-ng/libui-ng) instead of the old and 
unmaintained [libui](https://github.com/andlabs/libui) library. I made this 
fork because libui seems to be abandoned (ATOW, most recent update to libui was 
2 years ago), and `ui` hasn't been updated in a long time aswell 
(coincidentally, the most recent change also happens to be 2 years ago).

Some features that `uing` implements that aren't in `ui` are:
    

  * More widgets (Grids, DateTimePickers, ColorButtons, Areas, etc.)
  * Timers
  * Improved callbacks
  * more...



The source code can can be found here: <https://github.com/neroist/uing>

## Installation

You can install via Nimble: `nimble install uing`

## Documentation

UIng's documentation is hosted here: <https://neroist.github.io/uing/uing.html>

You can find examples 
[here](https://github.com/neroist/uing/tree/main/examples).

For `rawui` I suggest you look at libui-ng's official docs, which can be found 
[here](https://libui-ng.github.io/libui-ng/).

## Example

Heres the `datetime` example written with uing: (original C code 
[here](https://github.com/libui-ng/libui-ng/blob/master/examples/datetime/main.c))
    
    
    import std/times
    
    import uing
    
    proc main =
      let window = newWindow("Date / Time", 320, 240)
      window.margined = true
      
      let grid = newGrid(true)
      window.child = grid
      
      let
        dateTimeLabel = newLabel()
        dateLabel = newLabel()
        timeLabel = newLabel()
        
        dateTimePicker = newDateTimePicker() do (dt: DateTimePicker):
          dateTimeLabel.text = dt.time.format("ddd MMM d HH:mm:ss UUUU")
        
        datePicker = newDatePicker() do (dt: DateTimePicker):
          dateLabel.text = dt.time.format("yyyy-MM-dd")
        
        timePicker = newTimePicker() do (dt: DateTimePicker):
          timeLabel.text = dt.time.format("hh:mm:ss")
        
        nowButton = newButton("Now") do (_: Button):
          timePicker.time = now()
          datePicker.time = now()
        
        epochButton = newButton("Unix epoch") do (_: Button):
          dateTimePicker.time = dateTime(1969, mDec, 31, 19)
      
      grid.add(dateTimePicker, 0, 0, 2, 1, true, AlignFill, false, AlignFill)
      grid.add(datePicker, 0, 1, 1, 1, true, AlignFill, false, AlignFill)
      grid.add(timePicker, 1, 1, 1, 1, true, AlignFill, false, AlignFill)
      
      grid.add(dateTimeLabel, 0, 2, 2, 1, true, AlignCenter, false, AlignFill)
      grid.add(dateLabel, 0, 3, 1, 1, true, AlignCenter, false, AlignFill)
      grid.add(timeLabel, 1, 3, 1, 1, true, AlignCenter, false, AlignFill)
      
      grid.add(nowButton, 0, 4, 1, 1, true, AlignFill, true, AlignEnd)
      grid.add(epochButton, 1, 4, 1, 1, true, AlignFill, true, AlignEnd)
      
      show window
      mainLoop()
    
    init()
    main()
    
    
    Run

This results in this application on Windows: