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Theme.kt
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Theme.kt
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/*
* Copyright 2020 The Android Open Source Project
*
* 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
*
* https://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 com.example.owl.ui.theme
import androidx.compose.foundation.isSystemInDarkTheme
import androidx.compose.material.Colors
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Shapes
import androidx.compose.material.Typography
import androidx.compose.material.darkColors
import androidx.compose.material.lightColors
import androidx.compose.runtime.Composable
import androidx.compose.runtime.Providers
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import com.example.owl.R
private val YellowThemeLight = lightColors(
primary = yellow500,
primaryVariant = yellow400,
onPrimary = Color.Black,
secondary = blue700,
secondaryVariant = blue800,
onSecondary = Color.White
)
private val YellowThemeDark = darkColors(
primary = yellow200,
secondary = blue200,
onSecondary = Color.Black,
surface = yellowDarkPrimary
)
@Composable
fun YellowTheme(
darkTheme: Boolean = isSystemInDarkTheme(),
content: @Composable () -> Unit
) {
val colors = if (darkTheme) {
YellowThemeDark
} else {
YellowThemeLight
}
OwlTheme(darkTheme, colors, content)
}
private val BlueThemeLight = lightColors(
primary = blue700,
onPrimary = Color.White,
primaryVariant = blue800,
secondary = yellow500
)
private val BlueThemeDark = darkColors(
primary = blue200,
secondary = yellow200,
surface = blueDarkPrimary
)
@Composable
fun BlueTheme(
darkTheme: Boolean = isSystemInDarkTheme(),
content: @Composable () -> Unit
) {
val colors = if (darkTheme) {
BlueThemeDark
} else {
BlueThemeLight
}
OwlTheme(darkTheme, colors, content)
}
private val PinkThemeLight = lightColors(
primary = pink500,
secondary = pink500,
primaryVariant = pink600,
onPrimary = Color.Black
)
private val PinkThemeDark = darkColors(
primary = pink200,
secondary = pink200,
surface = pinkDarkPrimary
)
@Composable
fun PinkTheme(
darkTheme: Boolean = isSystemInDarkTheme(),
content: @Composable () -> Unit
) {
val colors = if (darkTheme) {
PinkThemeDark
} else {
PinkThemeLight
}
OwlTheme(darkTheme, colors, content)
}
private val LightElevation = Elevation()
private val DarkElevation = Elevation(card = 1.dp)
private val LightImages = Images(lockupLogo = R.drawable.ic_lockup_blue)
private val DarkImages = Images(lockupLogo = R.drawable.ic_lockup_white)
@Composable
private fun OwlTheme(
darkTheme: Boolean,
colors: Colors,
content: @Composable () -> Unit
) {
val elevation = if (darkTheme) DarkElevation else LightElevation
val images = if (darkTheme) DarkImages else LightImages
Providers(
ElevationAmbient provides elevation,
ImageAmbient provides images
) {
MaterialTheme(
colors = colors,
typography = typography,
shapes = shapes,
content = content
)
}
}
/**
* Alternate to [MaterialTheme] allowing us to add our own theme systems (e.g. [Elevation]) or to
* extend [MaterialTheme]'s types e.g. return our own [Colors] extension
*/
object OwlTheme {
/**
* Proxy to [MaterialTheme]
*/
@Composable
val colors: Colors
get() = MaterialTheme.colors
/**
* Proxy to [MaterialTheme]
*/
@Composable
val typography: Typography
get() = MaterialTheme.typography
/**
* Proxy to [MaterialTheme]
*/
@Composable
val shapes: Shapes
get() = MaterialTheme.shapes
/**
* Retrieves the current [Elevation] at the call site's position in the hierarchy.
*/
@Composable
val elevations: Elevation
get() = ElevationAmbient.current
/**
* Retrieves the current [Images] at the call site's position in the hierarchy.
*/
@Composable
val images: Images
get() = ImageAmbient.current
}