| /* |
| * 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.core.demos.focus |
| |
| import androidx.compose.runtime.Composable |
| import androidx.compose.runtime.getValue |
| import androidx.compose.runtime.setValue |
| import androidx.compose.runtime.state |
| import androidx.ui.core.Modifier |
| import androidx.ui.core.focus.ExperimentalFocus |
| import androidx.ui.core.gesture.tapGestureFilter |
| import androidx.ui.core.focus.FocusRequester |
| import androidx.ui.core.focus.focus |
| import androidx.ui.core.focus.focusObserver |
| import androidx.ui.core.focus.focusRequester |
| import androidx.ui.core.focus.isFocused |
| import androidx.compose.foundation.Text |
| import androidx.compose.ui.graphics.Color.Companion.Black |
| import androidx.compose.ui.graphics.Color.Companion.Green |
| import androidx.compose.foundation.layout.Arrangement |
| import androidx.compose.foundation.layout.Column |
| import androidx.compose.foundation.layout.Row |
| import androidx.compose.foundation.layout.RowScope |
| import androidx.compose.foundation.layout.fillMaxWidth |
| |
| @Composable |
| fun FocusableDemo() { |
| Column( |
| verticalArrangement = Arrangement.SpaceEvenly |
| ) { |
| CenteredRow { |
| Text("Click on any focusable to bring it into focus:") |
| } |
| CenteredRow { |
| FocusableText("Focusable 1") |
| } |
| CenteredRow { |
| FocusableText("Focusable 2") |
| } |
| CenteredRow { |
| FocusableText("Focusable 3") |
| } |
| } |
| } |
| |
| @Composable |
| @OptIn(ExperimentalFocus::class) |
| private fun FocusableText(text: String) { |
| var color by state { Black } |
| val focusRequester = FocusRequester() |
| Text( |
| modifier = Modifier |
| .focusRequester(focusRequester) |
| .focusObserver { color = if (it.isFocused) Green else Black } |
| .focus() |
| .tapGestureFilter { focusRequester.requestFocus() }, |
| text = text, |
| color = color |
| ) |
| } |
| |
| @Composable |
| private fun CenteredRow(children: @Composable RowScope.() -> Unit) { |
| Row( |
| modifier = Modifier.fillMaxWidth(), |
| horizontalArrangement = Arrangement.Center, |
| children = children |
| ) |
| } |