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State based TF snippets (#520)
* State based TF snippets * Apply Spotless * updates * Apply Spotless * Update StateBasedText.kt * Update StateBasedText.kt * Update StateBasedText.kt * Update StateBasedText.kt * Apply Spotless
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‎compose/snippets/src/main/java/com/example/compose/snippets/text/StateBasedText.kt

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/*
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* Copyright 2025 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.compose.snippets.text
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import android.text.TextUtils
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import androidx.compose.foundation.layout.padding
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import androidx.compose.foundation.text.BasicTextField
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import androidx.compose.foundation.text.KeyboardOptions
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import androidx.compose.foundation.text.input.InputTransformation
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import androidx.compose.foundation.text.input.OutputTransformation
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import androidx.compose.foundation.text.input.TextFieldBuffer
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import androidx.compose.foundation.text.input.TextFieldLineLimits
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import androidx.compose.foundation.text.input.TextFieldState
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import androidx.compose.foundation.text.input.clearText
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import androidx.compose.foundation.text.input.insert
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import androidx.compose.foundation.text.input.maxLength
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import androidx.compose.foundation.text.input.rememberTextFieldState
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import androidx.compose.foundation.text.input.selectAll
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import androidx.compose.foundation.text.input.setTextAndPlaceCursorAtEnd
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import androidx.compose.foundation.text.input.then
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//noinspection UsingMaterialAndMaterial3Libraries
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import androidx.compose.material.TextField
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//noinspection UsingMaterialAndMaterial3Libraries
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import androidx.compose.material3.Text
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import androidx.compose.runtime.Composable
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import androidx.compose.runtime.LaunchedEffect
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import androidx.compose.runtime.remember
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.graphics.Brush
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import androidx.compose.ui.graphics.Color
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import androidx.compose.ui.text.TextStyle
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import androidx.compose.ui.text.font.FontWeight
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import androidx.compose.ui.text.input.ImeAction
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import androidx.compose.ui.tooling.preview.Preview
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import androidx.compose.ui.unit.dp
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import androidx.core.text.isDigitsOnly
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import androidx.lifecycle.ViewModel
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@Composable
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fun StateBasedTextSnippets() {
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// [START android_compose_state_text_1]
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BasicTextField(state = rememberTextFieldState())
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TextField(state = rememberTextFieldState())
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// [END android_compose_state_text_1]
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}
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@Composable
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fun StyleTextField() {
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// [START android_compose_state_text_2]
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TextField(
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state = rememberTextFieldState(),
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lineLimits = TextFieldLineLimits.MultiLine(maxHeightInLines = 2),
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placeholder = { Text("") },
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textStyle = TextStyle(color = Color.Blue, fontWeight = FontWeight.Bold),
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modifier = Modifier.padding(20.dp)
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)
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// [END android_compose_state_text_2]
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}
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@Composable
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fun ConfigureLineLimits() {
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// [START android_compose_state_text_3]
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TextField(
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state = rememberTextFieldState(),
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lineLimits = TextFieldLineLimits.SingleLine
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)
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// [END android_compose_state_text_3]
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// [START android_compose_state_text_4]
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TextField(
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state = rememberTextFieldState(),
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lineLimits = TextFieldLineLimits.MultiLine(1, 4)
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)
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// [END android_compose_state_text_4]
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}
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@Composable
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fun StyleWithBrush() {
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// [START android_compose_state_text_5]
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val brush = remember {
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Brush.linearGradient(
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colors = listOf(Color.Red, Color.Yellow, Color.Green, Color.Blue, Color.Magenta)
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)
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}
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TextField(
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state = rememberTextFieldState(), textStyle = TextStyle(brush = brush)
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)
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// [END android_compose_state_text_5]
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}
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@Composable
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fun StateHoisting() {
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// [START android_compose_state_text_6]
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val usernameState = rememberTextFieldState()
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TextField(
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state = usernameState,
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lineLimits = TextFieldLineLimits.SingleLine,
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placeholder = { Text("Enter Username") }
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)
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// [END android_compose_state_text_6]
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}
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@Composable
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fun TextFieldInitialState() {
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// [START android_compose_state_text_7]
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TextField(
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state = rememberTextFieldState(initialText = "Username"),
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lineLimits = TextFieldLineLimits.SingleLine,
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)
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// [END android_compose_state_text_7]
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}
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@Composable
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fun TextFieldBuffer() {
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// [START android_compose_state_text_8]
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val phoneNumberState = rememberTextFieldState()
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LaunchedEffect(phoneNumberState) {
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phoneNumberState.edit { // TextFieldBuffer scope
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append("123456789")
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}
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}
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TextField(
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state = phoneNumberState,
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inputTransformation = InputTransformation { // TextFieldBuffer scope
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if (asCharSequence().isDigitsOnly()) {
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revertAllChanges()
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}
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},
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outputTransformation = OutputTransformation {
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if (length > 0) insert(0, "(")
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if (length > 4) insert(4, ")")
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if (length > 8) insert(8, "-")
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}
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)
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// [END android_compose_state_text_8]
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}
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@Preview
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@Composable
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fun EditTextFieldState() {
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// [START android_compose_state_text_9]
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val usernameState = rememberTextFieldState("I love Android")
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// textFieldState.text : I love Android
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// textFieldState.selection: TextRange(14, 14)
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usernameState.edit { insert(14, "!") }
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// textFieldState.text : I love Android!
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// textFieldState.selection: TextRange(15, 15)
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usernameState.edit { replace(7, 14, "Compose") }
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// textFieldState.text : I love Compose!
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// textFieldState.selection: TextRange(15, 15)
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usernameState.edit { append("!!!") }
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// textFieldState.text : I love Compose!!!!
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// textFieldState.selection: TextRange(18, 18)
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usernameState.edit { selectAll() }
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// textFieldState.text : I love Compose!!!!
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// textFieldState.selection: TextRange(0, 18)
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// [END android_compose_state_text_9]
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// [START android_compose_state_text_10]
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usernameState.setTextAndPlaceCursorAtEnd("I really love Android")
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// textFieldState.text : I really love Android
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// textFieldState.selection : TextRange(21, 21)
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// [END android_compose_state_text_10]
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// [START android_compose_state_text_11]
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usernameState.clearText()
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// textFieldState.text :
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// textFieldState.selection : TextRange(0, 0)
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// [END android_compose_state_text_11]
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}
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class TextFieldViewModel : ViewModel() {
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val usernameState = TextFieldState()
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fun validateUsername() {
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}
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}
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val textFieldViewModel = TextFieldViewModel()
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@Composable
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fun TextFieldKeyboardOptions() {
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// [START android_compose_state_text_13]
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TextField(
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state = textFieldViewModel.usernameState,
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keyboardOptions = KeyboardOptions(imeAction = ImeAction.Next),
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onKeyboardAction = { performDefaultAction ->
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textFieldViewModel.validateUsername()
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performDefaultAction()
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}
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)
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// [END android_compose_state_text_13]
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}
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@Composable
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fun TextFieldInputTransformation() {
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// [START android_compose_state_text_14]
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TextField(
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state = rememberTextFieldState(),
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lineLimits = TextFieldLineLimits.SingleLine,
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inputTransformation = InputTransformation.maxLength(10)
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)
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// [END android_compose_state_text_14]
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}
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// [START android_compose_state_text_15]
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class CustomInputTransformation : InputTransformation {
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override fun TextFieldBuffer.transformInput() {
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}
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}
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// [END android_compose_state_text_15]
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// [START android_compose_state_text_16]
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class DigitOnlyInputTransformation : InputTransformation {
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override fun TextFieldBuffer.transformInput() {
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if (!TextUtils.isDigitsOnly(asCharSequence())) {
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revertAllChanges()
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}
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}
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}
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// [END android_compose_state_text_16]
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@Composable
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fun ChainInputTransformation() {
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// [START android_compose_state_text_17]
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TextField(
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state = rememberTextFieldState(),
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inputTransformation = InputTransformation.maxLength(6)
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.then(CustomInputTransformation()),
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)
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// [END android_compose_state_text_17]
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}
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// [START android_compose_state_text_18]
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class CustomOutputTransformation : OutputTransformation {
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override fun TextFieldBuffer.transformOutput() {
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}
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}
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// [END android_compose_state_text_18]
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// [START android_compose_state_text_19]
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class PhoneNumberOutputTransformation : OutputTransformation {
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override fun TextFieldBuffer.transformOutput() {
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if (length > 0) insert(0, "(")
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if (length > 4) insert(4, ")")
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if (length > 8) insert(8, "-")
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}
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}
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// [END android_compose_state_text_19]
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@Composable
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fun TextFieldOutputTransformation() {
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// [START android_compose_state_text_20]
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TextField(
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state = rememberTextFieldState(),
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outputTransformation = PhoneNumberOutputTransformation()
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)
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// [END android_compose_state_text_20]
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}

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