maybe use Qt & Wt? :slightly_smiling_face:

# kotlin-native

[shodan45]

maybe use Qt & Wt? 🙂

[snrostov]

I'm working on something like that as experimental project. Generally it is inspired by Flutter. For now it supports React as web backend, JavaFX as java backend, and flutter-engine as native backend. Components looks like this:

class MyPage(key: String) : PureWidget(key) {
  override fun render() = Column {
    +Text(
        text = "Page title",
        style = TextStyle(
            fontSize = 24.0,
            fontWeight = bold
        )
    )

    +Container(margin = Insets(leftRight = 10.0)) {
      +Row {
        +Container(padding = 10.allSides) {
          +Column {
            +BulletList {
              +MenuItem("1", "About")
              +MenuItem("2", "Documentation")
            }
          }
        }
      }
    }
  }
}

class MenuItem(
    key: String,
    val title: String
) : PureWidget(key) {
  override fun render() = ListItem {
    +Text(color = 0xFF0000.rgbColor) {
      +MouseListener(click = ::click) {
        +title
      }
    }
  }

  private fun click(mouseEvent: MouseEvent) {
  }
}

[snrostov]

But it is really crazy. It is only my part-time experiment.

[rwachol]

so you're using flutter on desktop ?

[snrostov]

yes, but only flutter-engine

[peterholak]

I tried something similar for JVM and Native, but built on very low-level libraries like SDL and cairo (output on both platforms is exactly the same, pixel-for-pixel, because almost all of the code is shared)

[peterholak]

https://github.com/peterholak/mogul

[peterholak]

also don't have that much time to dedicate to it though 😄

[snrostov]

In fact, flutter-engine is not so high-level. It responsible only for layers composition and painting. All layout/rendering logic is implemented in flutter (dart), which I'm going to rewrite in kotlin/native

[peterholak]

how are you using it in Kotlin Native? it's written in C++ and doesn't seem to have a C API

[snrostov]

yep. moreover flutter-engine is dart-centric. I'm going to use only engine itself (sky engine), and rewrite other parts, to bind it to kotlin native

[snrostov]

hmm... looks like now flutter engine is only wrapping skia api. sky engine used only for text rendreing.

[peterholak]

but it's all C++, no? Kotlin Native can only directly interop with C libraries

[peterholak]

unless you write/generate the glue code for it

[snrostov]

yes, it is C++. By "bind it to kotlin native" I mean C api.