New splash screen

Author: Stefterv

app/build.gradle.kts

@@ -41,7 +41,7 @@ sourceSets{
 
 compose.desktop {
     application {
-        mainClass = "processing.app.ui.Splash"
+        mainClass = "processing.app.ui.Start"
 
         nativeDistributions{
             modules("jdk.jdi", "java.compiler")

app/src/processing/app/ui/Start.kt

@@ -0,0 +1,103 @@
+package processing.app.ui
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.EnterExitState
+import androidx.compose.animation.core.LinearEasing
+import androidx.compose.animation.core.tween
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.Text
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.draw.shadow
+import androidx.compose.ui.graphics.toComposeImageBitmap
+import androidx.compose.ui.unit.DpSize
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.window.*
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+import processing.app.Base
+import processing.app.Platform
+import javax.imageio.ImageIO
+import javax.swing.SwingUtilities
+
+/**
+ * Show a splash screen window. A rewrite of Splash.java
+ */
+class Start {
+    companion object {
+        @JvmStatic
+        fun main(args: Array<String>) {
+            val splash = Platform.getContentFile("lib/about-2x.png")
+            val image = ImageIO.read(splash).toComposeImageBitmap()
+            val duration = 200
+            val timeMargin = 50
+
+            application {
+                var starting by remember { mutableStateOf(true) }
+                Window(
+                    visible = starting,
+                    onCloseRequest = {  },
+                    undecorated = true,
+                    transparent = true,
+                    resizable = false,
+                    alwaysOnTop = true,
+                    state = rememberWindowState(
+                        position = WindowPosition(Alignment.Center),
+                        size = DpSize(image.width.dp / 2 , image.height.dp / 2)
+                    )
+                ) {
+                    var visible by remember { mutableStateOf(false) }
+                    val composition = rememberCoroutineScope()
+                    LaunchedEffect(Unit) {
+                        visible = true
+                        composition.launch {
+                            delay(duration.toLong() + timeMargin)
+                            try {
+                                Base.main(args)
+                            } catch (e: Exception) {
+                                throw InternalError("Failed to invoke main method", e)
+                            }
+                            composition.launch {
+                                visible = false
+                                delay(duration.toLong() + timeMargin)
+                                starting = false
+                            }
+                        }
+                    }
+                    AnimatedVisibility(
+                        visible = visible,
+                        enter = fadeIn(
+                            animationSpec = tween(
+                                durationMillis = duration,
+                                easing = LinearEasing
+                            )
+                        ),
+                        exit = fadeOut(
+                            animationSpec = tween(
+                                durationMillis = duration,
+                                easing = LinearEasing
+                            )
+                        )
+                    ) {
+                        Image(
+                            bitmap = image,
+                            contentDescription = "About",
+                            modifier = Modifier
+                                .fillMaxSize()
+                                .clip(RoundedCornerShape(16.dp))
+                        )
+                    }
+                }
+
+            }
+        }
+    }
+}