swing-ui

The core library: Jetpack Compose's composition runtime wired to Swing, plus composable wrappers over Swing components and layouts. Your UI is real JButton/JLabel/JPanel widgets, laid out by Swing's own LayoutManagers; Compose drives state and composition.

Usage

Drive composition into any Swing container with setContent, or use the application / Window entry points:

import org.jetbrains.compose.swing.components.button.Button
import org.jetbrains.compose.swing.components.layout.FlowPanel
import org.jetbrains.compose.swing.components.Label
import org.jetbrains.compose.swing.setContent
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import javax.swing.JFrame
import javax.swing.SwingUtilities

fun main() = SwingUtilities.invokeLater {
    val frame = JFrame("Counter").apply { defaultCloseOperation = JFrame.EXIT_ON_CLOSE }
    frame.setContent {
        var count by remember { mutableIntStateOf(0) }
        FlowPanel {
            Label("Count: $count")
            Button("Increment", onClick = { count++ })
        }
    }
    frame.setSize(400, 200)
    frame.isVisible = true
}

Styling and interaction flow through a modifier: SwingModifier = SwingModifier parameter; domain callbacks like onClick stay ordinary parameters. To wrap your own Swing component, use the public SwingNode API — see ../docs/CUSTOM-COMPONENTS.md.

The complete component, layout, modifier, window, dialog, and menu API is documented in KDoc.