| /* |
| * 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.compose.foundation.layout.samples |
| |
| import androidx.annotation.Sampled |
| import androidx.compose.Composable |
| import androidx.ui.core.Modifier |
| import androidx.compose.foundation.Box |
| import androidx.compose.foundation.Text |
| import androidx.compose.ui.graphics.Color |
| import androidx.compose.foundation.layout.Column |
| import androidx.compose.foundation.layout.ExperimentalLayout |
| import androidx.compose.foundation.layout.IntrinsicSize |
| import androidx.compose.foundation.layout.Row |
| import androidx.compose.foundation.layout.Stack |
| import androidx.compose.foundation.layout.aspectRatio |
| import androidx.compose.foundation.layout.fillMaxHeight |
| import androidx.compose.foundation.layout.fillMaxWidth |
| import androidx.compose.foundation.layout.preferredHeight |
| import androidx.compose.foundation.layout.preferredSize |
| import androidx.compose.foundation.layout.preferredWidth |
| import androidx.ui.unit.dp |
| |
| @Sampled |
| @Composable |
| @OptIn(ExperimentalLayout::class) |
| fun SameWidthBoxes() { |
| // Builds a layout containing three Box having the same width as the widest one. |
| // |
| // Here preferredWidth min intrinsic is adding a width premeasurement pass for the |
| // Column, whose minimum intrinsic width will correspond to the preferred width of the largest |
| // Box. Then preferredWidth min intrinsic will measure the Column with tight width, the |
| // same as the premeasured minimum intrinsic width, which due to fillMaxWidth will force |
| // the Box's to use the same width. |
| Stack { |
| Column(Modifier.preferredWidth(IntrinsicSize.Min).fillMaxHeight()) { |
| Box( |
| modifier = Modifier.fillMaxWidth().preferredSize(20.dp, 10.dp), |
| backgroundColor = Color.Gray |
| ) |
| Box( |
| modifier = Modifier.fillMaxWidth().preferredSize(30.dp, 10.dp), |
| backgroundColor = Color.Blue |
| ) |
| Box( |
| modifier = Modifier.fillMaxWidth().preferredSize(10.dp, 10.dp), |
| backgroundColor = Color.Magenta |
| ) |
| } |
| } |
| } |
| |
| @Sampled |
| @Composable |
| @OptIn(ExperimentalLayout::class) |
| fun MatchParentDividerForText() { |
| // Builds a layout containing two pieces of text separated by a divider, where the divider |
| // is sized according to the height of the longest text. |
| // |
| // Here preferredHeight min intrinsic is adding a height premeasurement pass for the Row, |
| // whose minimum intrinsic height will correspond to the height of the largest Text. Then |
| // preferredHeight min intrinsic will measure the Row with tight height, the same as the |
| // premeasured minimum intrinsic height, which due to fillMaxHeight will force the Texts and |
| // the divider to use the same height. |
| Stack { |
| Row(Modifier.preferredHeight(IntrinsicSize.Min)) { |
| Text( |
| text = "This is a really short text", |
| modifier = Modifier.weight(1f).fillMaxHeight() |
| ) |
| Box(Modifier.preferredWidth(1.dp).fillMaxHeight(), backgroundColor = Color.Black) |
| Text( |
| text = "This is a much much much much much much much much much much" + |
| " much much much much much much longer text", |
| modifier = Modifier.weight(1f).fillMaxHeight() |
| ) |
| } |
| } |
| } |
| |
| @Sampled |
| @Composable |
| @OptIn(ExperimentalLayout::class) |
| fun SameWidthTextBoxes() { |
| // Builds a layout containing three Text boxes having the same width as the widest one. |
| // |
| // Here preferredWidth max intrinsic is adding a width premeasurement pass for the Column, |
| // whose maximum intrinsic width will correspond to the preferred width of the largest |
| // Box. Then preferredWidth max intrinsic will measure the Column with tight width, the |
| // same as the premeasured maximum intrinsic width, which due to fillMaxWidth modifiers will |
| // force the Boxs to use the same width. |
| |
| Stack { |
| Column(Modifier.preferredWidth(IntrinsicSize.Max).fillMaxHeight()) { |
| Box(Modifier.fillMaxWidth(), backgroundColor = Color.Gray) { |
| Text("Short text") |
| } |
| Box(Modifier.fillMaxWidth(), backgroundColor = Color.Blue) { |
| Text("Extremely long text giving the width of its siblings") |
| } |
| Box(Modifier.fillMaxWidth(), backgroundColor = Color.Magenta) { |
| Text("Medium length text") |
| } |
| } |
| } |
| } |
| |
| @Sampled |
| @Composable |
| @OptIn(ExperimentalLayout::class) |
| fun MatchParentDividerForAspectRatio() { |
| // Builds a layout containing two aspectRatios separated by a divider, where the divider |
| // is sized according to the height of the taller aspectRatio. |
| // |
| // Here preferredHeight max intrinsic is adding a height premeasurement pass for the |
| // Row, whose maximum intrinsic height will correspond to the height of the taller |
| // aspectRatio. Then preferredHeight max intrinsic will measure the Row with tight height, |
| // the same as the premeasured maximum intrinsic height, which due to fillMaxHeight modifier |
| // will force the aspectRatios and the divider to use the same height. |
| // |
| Stack { |
| Row(Modifier.preferredHeight(IntrinsicSize.Max)) { |
| val modifier = Modifier.fillMaxHeight().weight(1f) |
| Box(modifier.aspectRatio(2f), backgroundColor = Color.Gray) |
| Box(Modifier.preferredWidth(1.dp).fillMaxHeight(), backgroundColor = Color.Black) |
| Box(modifier.aspectRatio(1f), backgroundColor = Color.Blue) |
| } |
| } |
| } |