Using an API which requires `placeholder: Painter?...

# compose

[Stylianos Gakis]

Using an API which requires placeholder: Painter? = null, to show on the screen, I am trying to figure out a way to provide a Painter which paints a solid color but with a specific shape (with some rounded corners etc.) but I can not figure out the right API to use here and I am pretty sure there must be something I can use. Any pointers?

[Francesc]

there is a ColorPainter that paints a solid color, an option would be to clone that and tweak it to add rounded corners

[Stylianos Gakis]

Yep that is exactly what I am trying out right now 😄

[Stylianos Gakis]

Copy pasting ColorPainter and replacing onDraw with

override fun DrawScope.onDraw() {
  val outline = shape.createOutline(size, layoutDirection, this)
  when (outline) {
    is Outline.Generic -> {
      drawPath(
        outline.path,
        color = color,
        alpha = alpha,
        colorFilter = colorFilter,
      )
    }
    is Outline.Rectangle -> {
      drawRect(color = color, alpha = alpha, colorFilter = colorFilter)
    }
    is Outline.Rounded -> {
      // drawCircle maybe not what I want here exactly, but good enough for me for now
      drawCircle(color = color, alpha = alpha, colorFilter = colorFilter)
    }
  }
}

Seems to work perfectly fine actually. In my case I only needed the Outline.Generic case, since I want to use this squircle shape here, but I added the others just in case.

[Stylianos Gakis]

And the entire class along with a remember* companion function just works for me 👍

If there is some built-in way to do this I would love to know about it still, but for now this works well for me

ShapedColorPainter.kt.cpp