| /* |
| * 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. |
| */ |
| |
| @file:Suppress("PLUGIN_WARNING") |
| |
| package androidx.ui.core.demos |
| |
| import androidx.compose.Composable |
| import androidx.ui.core.Constraints |
| import androidx.ui.core.Layout |
| import androidx.ui.core.Modifier |
| import androidx.ui.core.id |
| import androidx.ui.core.layoutId |
| import androidx.compose.foundation.Box |
| import androidx.compose.ui.graphics.Color |
| import androidx.compose.foundation.layout.fillMaxSize |
| |
| @Composable |
| fun HeaderFooterLayout( |
| header: @Composable () -> Unit, |
| footer: @Composable () -> Unit, |
| content: @Composable () -> Unit |
| ) { |
| Layout({ |
| Box(Modifier.layoutId("header"), children = header) |
| Box(Modifier.layoutId("footer"), children = footer) |
| content() |
| }) { measurables, constraints -> |
| val headerPlaceable = measurables.first { it.id == "header" }.measure( |
| Constraints.fixed(constraints.maxWidth, 100) |
| ) |
| val footerPadding = 50 |
| val footerPlaceable = measurables.first { it.id == "footer" }.measure( |
| Constraints.fixed(constraints.maxWidth - footerPadding * 2, 100) |
| ) |
| |
| val contentMeasurables = measurables.filter { it.id == null } |
| val itemHeight = |
| (constraints.maxHeight - headerPlaceable.height - footerPlaceable.height) / |
| contentMeasurables.size |
| val contentPlaceables = contentMeasurables.map { measurable -> |
| measurable.measure(Constraints.fixed(constraints.maxWidth, itemHeight)) |
| } |
| |
| layout(constraints.maxWidth, constraints.maxHeight) { |
| headerPlaceable.place(0, 0) |
| footerPlaceable.place(footerPadding, constraints.maxHeight - footerPlaceable.height) |
| var top = headerPlaceable.height |
| contentPlaceables.forEach { placeable -> |
| placeable.place(0, top) |
| top += itemHeight |
| } |
| } |
| } |
| } |
| |
| @Composable |
| fun MultipleCollectTest() { |
| val header = @Composable { |
| Box(Modifier.fillMaxSize(), backgroundColor = Color(android.graphics.Color.GRAY)) |
| } |
| val footer = @Composable { |
| Box(Modifier.fillMaxSize(), backgroundColor = Color(android.graphics.Color.BLUE)) |
| } |
| HeaderFooterLayout(header = header, footer = footer) { |
| Box(Modifier.fillMaxSize(), backgroundColor = Color(android.graphics.Color.GREEN)) |
| Box(Modifier.fillMaxSize(), backgroundColor = Color(android.graphics.Color.YELLOW)) |
| } |
| } |