| /* |
| * Copyright 2019 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 |
| * |
| * 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 androidx.ui.material |
| |
| import androidx.compose.Composable |
| import androidx.compose.Providers |
| import androidx.compose.remember |
| import androidx.compose.foundation.Indication |
| import androidx.compose.foundation.IndicationAmbient |
| import androidx.compose.foundation.ProvideTextStyle |
| import androidx.ui.material.ripple.RippleIndication |
| |
| /** |
| * A MaterialTheme defines the styling principles from the Material design specification. |
| * |
| * Material components such as [Button] and [Checkbox] use values provided here when retrieving |
| * default values. |
| * |
| * It defines colors as specified in the [Material Color theme creation spec](https://material.io/design/color/the-color-system.html#color-theme-creation), |
| * typography defined in the [Material Type Scale spec](https://material.io/design/typography/the-type-system.html#type-scale), |
| * and shapes defined in the [Shape scheme](https://material.io/design/shape/applying-shape-to-ui.html#shape-scheme). |
| * |
| * All values may be set by providing this component with the [colors][ColorPalette], |
| * [typography][Typography], and [shapes][Shapes] attributes. Use this to configure the overall |
| * theme of elements within this MaterialTheme. |
| * |
| * Any values that are not set will inherit the current value from the theme, falling back to the |
| * defaults if there is no parent MaterialTheme. This allows using a MaterialTheme at the top |
| * of your application, and then separate MaterialTheme(s) for different screens / parts of your |
| * UI, overriding only the parts of the theme definition that need to change. |
| * |
| * @sample androidx.ui.material.samples.MaterialThemeSample |
| * |
| * @param colors A complete definition of the Material Color theme for this hierarchy |
| * @param typography A set of text styles to be used as this hierarchy's typography system |
| * @param shapes A set of shapes to be used by the components in this hierarchy |
| */ |
| @Composable |
| fun MaterialTheme( |
| colors: ColorPalette = MaterialTheme.colors, |
| typography: Typography = MaterialTheme.typography, |
| shapes: Shapes = MaterialTheme.shapes, |
| content: @Composable () -> Unit |
| ) { |
| ProvideColorPalette(colors) { |
| val indicationFactory: @Composable () -> Indication = remember { { RippleIndication() } } |
| Providers( |
| IndicationAmbient provides indicationFactory, |
| TypographyAmbient provides typography, |
| ShapesAmbient provides shapes |
| ) { |
| ProvideTextStyle(value = typography.body1, children = content) |
| } |
| } |
| } |
| |
| /** |
| * Contains functions to access the current theme values provided at the call site's position in |
| * the hierarchy. |
| */ |
| object MaterialTheme { |
| /** |
| * Retrieves the current [ColorPalette] at the call site's position in the hierarchy. |
| * |
| * @sample androidx.ui.material.samples.ThemeColorSample |
| */ |
| @Composable |
| val colors: ColorPalette |
| get() = ColorAmbient.current |
| |
| /** |
| * Retrieves the current [Typography] at the call site's position in the hierarchy. |
| * |
| * @sample androidx.ui.material.samples.ThemeTextStyleSample |
| */ |
| @Composable |
| val typography: Typography |
| get() = TypographyAmbient.current |
| |
| /** |
| * Retrieves the current [Shapes] at the call site's position in the hierarchy. |
| */ |
| @Composable |
| val shapes: Shapes |
| get() = ShapesAmbient.current |
| } |