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Copy pathThinkingInComposeSnippets.kt
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/*
* Copyright 2023 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
*
* https://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.
*/
@file:Suppress("unused")
package com.example.compose.snippets.mentalmodel
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.material3.Button
import androidx.compose.material3.Card
import androidx.compose.material3.Checkbox
import androidx.compose.material3.HorizontalDivider
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
// [START android_compose_thinking_in_compose_dynamic_content]
@Composable
fun Greeting(names: List<String>) {
for (name in names) {
Text("Hello $name")
}
}
// [END android_compose_thinking_in_compose_dynamic_content]
// [START android_compose_thinking_in_compose_recomposition]
@Composable
fun ClickCounter(clicks: Int, onClick: () -> Unit) {
Button(onClick = onClick) {
Text("I've been clicked $clicks times")
}
}
// [END android_compose_thinking_in_compose_recomposition]
// [START android_compose_thinking_in_compose_recomposition_logic]
@Composable
fun SharedPrefsToggle(
text: String,
value: Boolean,
onValueChanged: (Boolean) -> Unit
) {
Row {
Text(text)
Checkbox(checked = value, onCheckedChange = onValueChanged)
}
}
// [END android_compose_thinking_in_compose_recomposition_logic]
@Suppress("UNUSED_PARAMETER")
@Composable
fun MyFancyNavigation(content: @Composable () -> Unit) {
}
@Composable
fun StartScreen() {
}
@Composable
fun MiddleScreen() {
}
@Composable
fun EndScreen() {
}
// [START android_compose_thinking_in_compose_order]
@Composable
fun ButtonRow() {
MyFancyNavigation {
StartScreen()
MiddleScreen()
EndScreen()
}
}
// [END android_compose_thinking_in_compose_order]
// [START android_compose_thinking_in_compose_parallel]
@Composable
fun ListComposable(myList: List<String>) {
Row(horizontalArrangement = Arrangement.SpaceBetween) {
Column {
for (item in myList) {
Text("Item: $item")
}
}
Text("Count: ${myList.size}")
}
}
// [END android_compose_thinking_in_compose_parallel]
// [START android_compose_thinking_in_compose_incorrect]
@Composable
fun ListWithBug(myList: List<String>) {
var items = 0
Row(horizontalArrangement = Arrangement.SpaceBetween) {
Column {
for (item in myList) {
Card {
Text("Item: $item")
items++ // Avoid! Side-effect of the column recomposing.
}
}
}
Text("Count: $items")
}
}
// [END android_compose_thinking_in_compose_incorrect]
// [START android_compose_thinking_in_compose_skips]
/**
* Display a list of names the user can click with a header
*/
@Composable
fun NamePicker(
header: String,
names: List<String>,
onNameClicked: (String) -> Unit
) {
Column {
// this will recompose when [header] changes, but not when [names] changes
Text(header, style = MaterialTheme.typography.bodyLarge)
HorizontalDivider()
// LazyColumn is the Compose version of a RecyclerView.
// The lambda passed to items() is similar to a RecyclerView.ViewHolder.
LazyColumn {
items(names) { name ->
// When an item's [name] updates, the adapter for that item
// will recompose. This will not recompose when [header] changes
NamePickerItem(name, onNameClicked)
}
}
}
}
/**
* Display a single name the user can click.
*/
@Composable
private fun NamePickerItem(name: String, onClicked: (String) -> Unit) {
Text(name, Modifier.clickable(onClick = { onClicked(name) }))
}
// [END android_compose_thinking_in_compose_skips]