Change-Id: I6a85ee82a78b1897020f1737503611bd100764a1pull/2/head
Jolanda Verhoef
2 years ago
committed by
Don Turner
parent
cce9402b04
commit
ce0142b98a
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/*
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* Copyright 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.samples.apps.nowinandroid.core.ui.component
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import android.content.res.Configuration
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import androidx.compose.foundation.background
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import androidx.compose.foundation.layout.Box
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import androidx.compose.foundation.layout.fillMaxSize
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import androidx.compose.foundation.layout.size
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import androidx.compose.material3.Surface
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import androidx.compose.runtime.Composable
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.graphics.Brush
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import androidx.compose.ui.graphics.Color
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import androidx.compose.ui.tooling.preview.Preview
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import androidx.compose.ui.unit.Dp
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import androidx.compose.ui.unit.dp
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import com.google.samples.apps.nowinandroid.core.ui.theme.LocalBackgroundTheme
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import com.google.samples.apps.nowinandroid.core.ui.theme.NiaTheme
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/**
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* The main background for the app.
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* Uses [LocalBackgroundTheme] to set the color and tonal elevation of a [Surface].
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*
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* @param modifier Modifier to be applied to the background.
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* @param content The background content.
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*/
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@Composable
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fun NiaBackground(
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modifier: Modifier = Modifier,
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content: @Composable () -> Unit
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) {
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val color = LocalBackgroundTheme.current.color
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val tonalElevation = LocalBackgroundTheme.current.tonalElevation
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Surface(
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color = if (color == Color.Unspecified) Color.Transparent else color,
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tonalElevation = if (tonalElevation == Dp.Unspecified) 0.dp else tonalElevation,
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modifier = modifier.fillMaxSize(),
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content = content
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)
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}
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/**
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* A gradient background for select screens, to be overlaid on top of [NiaBackground].
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* Uses [LocalBackgroundTheme] to set the gradient colors of a [Box].
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*
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* @param modifier Modifier to be applied to the background.
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* @param topColor The top gradient color to be rendered.
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* @param bottomColor The bottom gradient color to be rendered.
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* @param content The background content.
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*/
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@Composable
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fun NiaGradientBackground(
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modifier: Modifier = Modifier,
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topColor: Color = LocalBackgroundTheme.current.primaryGradientColor,
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bottomColor: Color = LocalBackgroundTheme.current.secondaryGradientColor,
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content: @Composable () -> Unit
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) {
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val gradientModifier = Modifier.background(
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Brush.verticalGradient(
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listOf(
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if (topColor == Color.Unspecified) Color.Transparent else topColor,
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Color.Transparent,
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if (bottomColor == Color.Unspecified) Color.Transparent else bottomColor
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)
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)
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)
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Box(
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modifier = modifier
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.fillMaxSize()
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.then(gradientModifier)
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) {
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content()
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}
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}
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@Preview(uiMode = Configuration.UI_MODE_NIGHT_NO, name = "Light theme")
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@Preview(uiMode = Configuration.UI_MODE_NIGHT_YES, name = "Dark theme")
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@Composable
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fun BackgroundDefault() {
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NiaTheme {
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NiaBackground(Modifier.size(100.dp), content = {})
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}
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}
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@Preview(uiMode = Configuration.UI_MODE_NIGHT_NO, name = "Light theme")
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@Preview(uiMode = Configuration.UI_MODE_NIGHT_YES, name = "Dark theme")
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@Composable
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fun BackgroundDynamic() {
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NiaTheme(dynamicColor = true) {
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NiaBackground(Modifier.size(100.dp), content = {})
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}
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}
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@Preview(uiMode = Configuration.UI_MODE_NIGHT_NO, name = "Light theme")
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@Preview(uiMode = Configuration.UI_MODE_NIGHT_YES, name = "Dark theme")
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@Composable
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fun BackgroundAndroid() {
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NiaTheme(androidTheme = true) {
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NiaBackground(Modifier.size(100.dp), content = {})
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}
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}
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@Preview(uiMode = Configuration.UI_MODE_NIGHT_NO, name = "Light theme")
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@Preview(uiMode = Configuration.UI_MODE_NIGHT_YES, name = "Dark theme")
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@Composable
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fun GradientBackgroundDefault() {
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NiaTheme {
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NiaGradientBackground(Modifier.size(100.dp), content = {})
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}
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}
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@Preview(uiMode = Configuration.UI_MODE_NIGHT_NO, name = "Light theme")
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@Preview(uiMode = Configuration.UI_MODE_NIGHT_YES, name = "Dark theme")
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@Composable
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fun GradientBackgroundDynamic() {
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NiaTheme(dynamicColor = true) {
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NiaGradientBackground(Modifier.size(100.dp), content = {})
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}
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}
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@Preview(uiMode = Configuration.UI_MODE_NIGHT_NO, name = "Light theme")
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@Preview(uiMode = Configuration.UI_MODE_NIGHT_YES, name = "Dark theme")
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@Composable
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fun GradientBackgroundAndroid() {
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NiaTheme(androidTheme = true) {
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NiaGradientBackground(Modifier.size(100.dp), content = {})
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}
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}
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@ -0,0 +1,41 @@
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/*
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* Copyright 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.samples.apps.nowinandroid.core.ui.theme
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import androidx.compose.runtime.Immutable
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import androidx.compose.runtime.staticCompositionLocalOf
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import androidx.compose.ui.graphics.Color
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import androidx.compose.ui.unit.Dp
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/**
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* A class to model background values for Now in Android,
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* including color, tonal elevation and gradient colors.
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*/
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@Immutable
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data class BackgroundTheme(
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val color: Color = Color.Unspecified,
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val tonalElevation: Dp = Dp.Unspecified,
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val primaryGradientColor: Color = Color.Unspecified,
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val secondaryGradientColor: Color = Color.Unspecified,
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val tertiaryGradientColor: Color = Color.Unspecified,
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val neutralGradientColor: Color = Color.Unspecified
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)
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/**
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* A composition local for [BackgroundTheme].
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*/
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val LocalBackgroundTheme = staticCompositionLocalOf { BackgroundTheme() }
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