| /* |
| * 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.navigation.compose.demos |
| |
| import androidx.compose.foundation.layout.Column |
| import androidx.compose.foundation.layout.fillMaxSize |
| import androidx.compose.foundation.layout.padding |
| import androidx.compose.material.Divider |
| import androidx.compose.material.Text |
| import androidx.compose.material.TextField |
| import androidx.compose.runtime.Composable |
| import androidx.compose.runtime.savedinstancestate.savedInstanceState |
| import androidx.compose.ui.Modifier |
| import androidx.compose.ui.graphics.Color |
| import androidx.compose.ui.text.input.TextFieldValue |
| import androidx.compose.ui.unit.dp |
| import androidx.navigation.compose.NavHost |
| import androidx.navigation.compose.composable |
| import androidx.navigation.compose.navigate |
| import androidx.navigation.compose.rememberNavController |
| import androidx.navigation.compose.samples.NavigateButton |
| |
| @Composable |
| fun NavSingleTopDemo() { |
| val navController = rememberNavController() |
| val query = savedInstanceState(saver = TextFieldValue.Saver) { TextFieldValue() } |
| Column(Modifier.fillMaxSize().then(Modifier.padding(8.dp))) { |
| TextField( |
| value = query.value, |
| onValueChange = { query.value = it }, |
| placeholder = { Text("Search") } |
| ) |
| NavigateButton("Search") { |
| navController.navigate("search/" + query.value.text) { |
| launchSingleTop = true |
| } |
| } |
| NavHost(navController, startDestination = "start") { |
| composable("start") { StartScreen() } |
| composable("search/{query}") { backStackEntry -> |
| SearchResultScreen( |
| backStackEntry.arguments!!.getString("query", "no query entered") |
| ) |
| } |
| } |
| } |
| } |
| |
| @Composable |
| fun StartScreen() { |
| Divider(color = Color.Black) |
| Text(text = "Start a search above") |
| } |
| |
| @Composable |
| fun SearchResultScreen(query: String) { |
| Text("You searched for $query") |
| } |