| /* |
| * 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.keyinput |
| |
| import androidx.compose.runtime.Composable |
| import androidx.compose.runtime.MutableState |
| 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.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.ui.core.gesture.tapGestureFilter |
| import androidx.ui.core.keyinput.ExperimentalKeyInput |
| import androidx.ui.core.keyinput.Key |
| import androidx.ui.core.keyinput.KeyEvent2 |
| import androidx.ui.core.keyinput.KeyEventType |
| import androidx.ui.core.keyinput.keyInputFilter |
| import androidx.compose.foundation.Text |
| import androidx.compose.ui.graphics.Color |
| 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 KeyInputDemo() { |
| Column( |
| verticalArrangement = Arrangement.SpaceEvenly |
| ) { |
| CenteredRow { |
| Text( |
| "Click on any item to bring it into focus. \nThen type using a hardware keyboard." |
| ) |
| } |
| CenteredRow { |
| FocusableText(state { "Enter Text Here" }) |
| } |
| CenteredRow { |
| FocusableText(state { "Enter Text Here" }) |
| } |
| CenteredRow { |
| FocusableText(state { "Enter Text Here" }) |
| } |
| } |
| } |
| |
| @Composable |
| @OptIn( |
| ExperimentalFocus::class, |
| ExperimentalKeyInput::class |
| ) |
| private fun FocusableText(text: MutableState<String>) { |
| var color by state { Color.Black } |
| val focusRequester = FocusRequester() |
| Text( |
| modifier = Modifier |
| .focusRequester(focusRequester) |
| .focusObserver { color = if (it.isFocused) Color.Green else Color.Black } |
| .focus() |
| .tapGestureFilter { focusRequester.requestFocus() } |
| .keyInputFilter { it.value?.let { text.value += it; true } ?: false }, |
| text = text.value, |
| color = color |
| ) |
| } |
| |
| @Composable |
| private fun CenteredRow(children: @Composable RowScope.() -> Unit) { |
| Row( |
| modifier = Modifier.fillMaxWidth(), |
| horizontalArrangement = Arrangement.Center, |
| children = children |
| ) |
| } |
| |
| @OptIn(ExperimentalKeyInput::class) |
| private val KeyEvent2.value: String? |
| get() { |
| if (type != KeyEventType.KeyUp) return null |
| return when (key) { |
| Key.A -> "a" |
| Key.B -> "b" |
| Key.C -> "c" |
| Key.D -> "d" |
| Key.E -> "e" |
| Key.F -> "f" |
| Key.G -> "g" |
| Key.H -> "h" |
| Key.I -> "i" |
| Key.J -> "j" |
| Key.K -> "k" |
| Key.L -> "l" |
| Key.M -> "m" |
| Key.N -> "n" |
| Key.O -> "o" |
| Key.P -> "p" |
| Key.Q -> "q" |
| Key.R -> "r" |
| Key.S -> "s" |
| Key.T -> "t" |
| Key.U -> "u" |
| Key.V -> "v" |
| Key.W -> "w" |
| Key.X -> "x" |
| Key.Y -> "y" |
| Key.Z -> "z" |
| Key.Spacebar -> " " |
| else -> null |
| } |
| } |