| /* |
| * Copyright 2020 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.demos.text |
| |
| import androidx.compose.foundation.lazy.LazyColumn |
| import androidx.compose.foundation.text.BasicTextField |
| import androidx.compose.foundation.text.KeyboardOptions |
| import androidx.compose.runtime.Composable |
| import androidx.compose.runtime.mutableStateOf |
| import androidx.compose.runtime.saveable.rememberSaveable |
| import androidx.compose.ui.text.TextStyle |
| import androidx.compose.ui.text.input.KeyboardType |
| import androidx.compose.ui.unit.sp |
| |
| @Composable |
| fun InputFieldTrickyUseCase() { |
| LazyColumn { |
| item { |
| TagLine(tag = "don't set if non number is added") |
| RejectNonDigits() |
| } |
| |
| item { |
| TagLine(tag = "always clear composition") |
| RejectComposition() |
| } |
| } |
| } |
| |
| @Composable |
| private fun RejectNonDigits() { |
| val state = rememberSaveable { mutableStateOf("") } |
| BasicTextField( |
| modifier = demoTextFieldModifiers, |
| value = state.value, |
| textStyle = TextStyle(fontSize = 32.sp), |
| onValueChange = { |
| if (it.all { text -> text.isDigit() }) { |
| state.value = it |
| } |
| }, |
| keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number) |
| ) |
| } |
| |
| @Composable |
| private fun RejectComposition() { |
| val state = rememberSaveable { mutableStateOf(({ "" })()) } |
| BasicTextField( |
| modifier = demoTextFieldModifiers, |
| value = state.value, |
| textStyle = TextStyle(fontSize = 32.sp), |
| onValueChange = { |
| state.value = it |
| } |
| ) |
| } |