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| 1 | +/* |
| 2 | + * Copyright 2025 The Android Open Source Project |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * https://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | + |
| 17 | +package com.example.compose.snippets.components |
| 18 | + |
| 19 | +import androidx.compose.foundation.layout.Box |
| 20 | +import androidx.compose.foundation.layout.fillMaxSize |
| 21 | +import androidx.compose.foundation.layout.padding |
| 22 | +import androidx.compose.material.icons.Icons |
| 23 | +import androidx.compose.material.icons.filled.Album |
| 24 | +import androidx.compose.material.icons.filled.MusicNote |
| 25 | +import androidx.compose.material.icons.filled.PlaylistAddCircle |
| 26 | +import androidx.compose.material3.ExperimentalMaterial3Api |
| 27 | +import androidx.compose.material3.Icon |
| 28 | +import androidx.compose.material3.NavigationBar |
| 29 | +import androidx.compose.material3.NavigationBarDefaults |
| 30 | +import androidx.compose.material3.NavigationBarItem |
| 31 | +import androidx.compose.material3.NavigationRail |
| 32 | +import androidx.compose.material3.NavigationRailItem |
| 33 | +import androidx.compose.material3.PrimaryTabRow |
| 34 | +import androidx.compose.material3.Scaffold |
| 35 | +import androidx.compose.material3.Tab |
| 36 | +import androidx.compose.material3.Text |
| 37 | +import androidx.compose.runtime.Composable |
| 38 | +import androidx.compose.runtime.getValue |
| 39 | +import androidx.compose.runtime.mutableIntStateOf |
| 40 | +import androidx.compose.runtime.saveable.rememberSaveable |
| 41 | +import androidx.compose.runtime.setValue |
| 42 | +import androidx.compose.ui.Alignment |
| 43 | +import androidx.compose.ui.Modifier |
| 44 | +import androidx.compose.ui.graphics.vector.ImageVector |
| 45 | +import androidx.compose.ui.text.style.TextOverflow |
| 46 | +import androidx.compose.ui.tooling.preview.Preview |
| 47 | +import androidx.navigation.NavHostController |
| 48 | +import androidx.navigation.compose.NavHost |
| 49 | +import androidx.navigation.compose.composable |
| 50 | +import androidx.navigation.compose.rememberNavController |
| 51 | + |
| 52 | +@Composable |
| 53 | +fun SongsScreen(modifier: Modifier = Modifier) { |
| 54 | + Box( |
| 55 | + modifier = Modifier.fillMaxSize(), |
| 56 | + contentAlignment = Alignment.Center |
| 57 | + ) { |
| 58 | + Text("Songs Screen") |
| 59 | + } |
| 60 | +} |
| 61 | + |
| 62 | +@Composable |
| 63 | +fun AlbumScreen(modifier: Modifier = Modifier) { |
| 64 | + Box( |
| 65 | + modifier = Modifier.fillMaxSize(), |
| 66 | + contentAlignment = Alignment.Center |
| 67 | + ) { |
| 68 | + Text("Album Screen") |
| 69 | + } |
| 70 | +} |
| 71 | + |
| 72 | +@Composable |
| 73 | +fun PlaylistScreen(modifier: Modifier = Modifier) { |
| 74 | + Box( |
| 75 | + modifier = Modifier.fillMaxSize(), |
| 76 | + contentAlignment = Alignment.Center |
| 77 | + ) { |
| 78 | + Text("Playlist Screen") |
| 79 | + } |
| 80 | +} |
| 81 | + |
| 82 | +enum class Destination( |
| 83 | + val route: String, |
| 84 | + val label: String, |
| 85 | + val icon: ImageVector, |
| 86 | + val contentDescription: String |
| 87 | +) { |
| 88 | + SONGS("songs", "Songs", Icons.Default.MusicNote, "Songs"), |
| 89 | + ALBUM("album", "Album", Icons.Default.Album, "Album"), |
| 90 | + PLAYLISTS("playlist", "Playlist", Icons.Default.PlaylistAddCircle, "Playlist") |
| 91 | +} |
| 92 | + |
| 93 | +@Composable |
| 94 | +fun AppNavHost( |
| 95 | + navController: NavHostController, |
| 96 | + startDestination: Destination, |
| 97 | + modifier: Modifier = Modifier |
| 98 | +) { |
| 99 | + NavHost( |
| 100 | + navController, |
| 101 | + startDestination = startDestination.route |
| 102 | + ) { |
| 103 | + Destination.entries.forEach { destination -> |
| 104 | + composable(destination.route) { |
| 105 | + when (destination) { |
| 106 | + Destination.SONGS -> SongsScreen() |
| 107 | + Destination.ALBUM -> AlbumScreen() |
| 108 | + Destination.PLAYLISTS -> PlaylistScreen() |
| 109 | + } |
| 110 | + } |
| 111 | + } |
| 112 | + } |
| 113 | +} |
| 114 | + |
| 115 | +@Preview() |
| 116 | +// [START android_compose_components_navigationbarexample] |
| 117 | +@Composable |
| 118 | +fun NavigationBarExample(modifier: Modifier = Modifier) { |
| 119 | + val navController = rememberNavController() |
| 120 | + val startDestination = Destination.SONGS |
| 121 | + var selectedDestination by rememberSaveable { mutableIntStateOf(startDestination.ordinal) } |
| 122 | + |
| 123 | + Scaffold( |
| 124 | + modifier = modifier, |
| 125 | + bottomBar = { |
| 126 | + NavigationBar(windowInsets = NavigationBarDefaults.windowInsets) { |
| 127 | + Destination.entries.forEachIndexed { index, destination -> |
| 128 | + NavigationBarItem( |
| 129 | + selected = selectedDestination == index, |
| 130 | + onClick = { |
| 131 | + navController.navigate(route = destination.route) |
| 132 | + selectedDestination = index |
| 133 | + }, |
| 134 | + icon = { |
| 135 | + Icon( |
| 136 | + destination.icon, |
| 137 | + contentDescription = destination.contentDescription |
| 138 | + ) |
| 139 | + }, |
| 140 | + label = { Text(destination.label) } |
| 141 | + ) |
| 142 | + } |
| 143 | + } |
| 144 | + } |
| 145 | + ) { contentPadding -> |
| 146 | + AppNavHost(navController, startDestination, modifier = Modifier.padding(contentPadding)) |
| 147 | + } |
| 148 | +} |
| 149 | +// [END android_compose_components_navigationbarexample] |
| 150 | + |
| 151 | +@Preview() |
| 152 | +// [START android_compose_components_navigationrailexample] |
| 153 | +@Composable |
| 154 | +fun NavigationRailExample(modifier: Modifier = Modifier) { |
| 155 | + val navController = rememberNavController() |
| 156 | + val startDestination = Destination.SONGS |
| 157 | + var selectedDestination by rememberSaveable { mutableIntStateOf(startDestination.ordinal) } |
| 158 | + |
| 159 | + Scaffold(modifier = modifier) { contentPadding -> |
| 160 | + NavigationRail(modifier = Modifier.padding(contentPadding)) { |
| 161 | + Destination.entries.forEachIndexed { index, destination -> |
| 162 | + NavigationRailItem( |
| 163 | + selected = selectedDestination == index, |
| 164 | + onClick = { |
| 165 | + navController.navigate(route = destination.route) |
| 166 | + selectedDestination = index |
| 167 | + }, |
| 168 | + icon = { |
| 169 | + Icon( |
| 170 | + destination.icon, |
| 171 | + contentDescription = destination.contentDescription |
| 172 | + ) |
| 173 | + }, |
| 174 | + label = { Text(destination.label) } |
| 175 | + ) |
| 176 | + } |
| 177 | + } |
| 178 | + AppNavHost(navController, startDestination) |
| 179 | + } |
| 180 | +} |
| 181 | +// [END android_compose_components_navigationrailexample] |
| 182 | + |
| 183 | +@OptIn(ExperimentalMaterial3Api::class) |
| 184 | +@Preview(showBackground = true) |
| 185 | +// [START android_compose_components_navigationtabexample] |
| 186 | +@Composable |
| 187 | +fun NavigationTabExample(modifier: Modifier = Modifier) { |
| 188 | + val navController = rememberNavController() |
| 189 | + val startDestination = Destination.SONGS |
| 190 | + var selectedDestination by rememberSaveable { mutableIntStateOf(startDestination.ordinal) } |
| 191 | + |
| 192 | + Scaffold(modifier = modifier) { contentPadding -> |
| 193 | + PrimaryTabRow(selectedTabIndex = selectedDestination, modifier = Modifier.padding(contentPadding)) { |
| 194 | + Destination.entries.forEachIndexed { index, destination -> |
| 195 | + Tab( |
| 196 | + selected = selectedDestination == index, |
| 197 | + onClick = { |
| 198 | + navController.navigate(route = destination.route) |
| 199 | + selectedDestination = index |
| 200 | + }, |
| 201 | + text = { |
| 202 | + Text( |
| 203 | + text = destination.label, |
| 204 | + maxLines = 2, |
| 205 | + overflow = TextOverflow.Ellipsis |
| 206 | + ) |
| 207 | + } |
| 208 | + ) |
| 209 | + } |
| 210 | + } |
| 211 | + AppNavHost(navController, startDestination) |
| 212 | + } |
| 213 | +} |
| 214 | +// [END android_compose_components_navigationtabexample] |
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