Gradient Background

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/background/LightGradientBackground.kt

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2024 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.libraries.designsystem.background
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Size
+import androidx.compose.ui.geometry.center
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.RadialGradientShader
+import androidx.compose.ui.graphics.Shader
+import androidx.compose.ui.graphics.ShaderBrush
+import io.element.android.libraries.designsystem.preview.ElementPreview
+import io.element.android.libraries.designsystem.preview.PreviewsDayNight
+
+class LightGradientBackground(
+    private val firstColor: Color = Color(0x1E0DBD8B),
+    private val secondColor: Color = Color(0x001273EB),
+    private val ratio: Float = 642 / 775f,
+) : ShaderBrush() {
+    override fun createShader(size: Size): Shader {
+        val biggerDimension = size.width * 1.98f
+        return RadialGradientShader(
+            colors = listOf(firstColor, secondColor),
+            center = size.center.copy(x = size.width * ratio, y = size.height * ratio),
+            radius = biggerDimension / 2f,
+            colorStops = listOf(0f, 0.95f)
+        )
+    }
+}
+
+@PreviewsDayNight
+@Composable
+internal fun LightGradientBackgroundPreview() = ElementPreview {
+    val gradientBackground = remember {
+        LightGradientBackground()
+    }
+    Box(
+        modifier = Modifier
+            .fillMaxSize()
+            .background(gradientBackground)
+    )
+}