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Checkbox.kt
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Checkbox.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.
*/
package com.example.compose.snippets.components
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Checkbox
import androidx.compose.material3.Text
import androidx.compose.material3.TriStateCheckbox
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateListOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.state.ToggleableState
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
@Preview
@Composable
fun CheckboxExamples() {
Column(
modifier = Modifier
.padding(16.dp)
.fillMaxSize(),
verticalArrangement = Arrangement.spacedBy(32.dp),
horizontalAlignment = Alignment.CenterHorizontally,
) {
Column {
Text("Minimal checkbox example")
CheckboxMinimalExample()
}
Column {
Text("Parent checkbox example")
CheckboxParentExample()
}
}
}
@Preview
// [START android_compose_components_checkbox_minimal]
@Composable
fun CheckboxMinimalExample() {
var checked by remember { mutableStateOf(true) }
Row(
verticalAlignment = Alignment.CenterVertically,
) {
Text(
"Minimal checkbox"
)
Checkbox(
checked = checked,
onCheckedChange = { checked = it }
)
}
Text(
if (checked) "Checkbox is checked" else "Checkbox is unchecked"
)
}
// [END android_compose_components_checkbox_minimal]
@Preview
// [START android_compose_components_checkbox_parent]
@Composable
fun CheckboxParentExample() {
// Initialize states for the child checkboxes
val childCheckedStates = remember { mutableStateListOf(false, false, false) }
// Compute the parent state based on children's states
val parentState = when {
childCheckedStates.all { it } -> ToggleableState.On
childCheckedStates.none { it } -> ToggleableState.Off
else -> ToggleableState.Indeterminate
}
Column {
// Parent TriStateCheckbox
Row(
verticalAlignment = Alignment.CenterVertically,
) {
Text("Select all")
TriStateCheckbox(
state = parentState,
onClick = {
// Determine new state based on current state
val newState = parentState != ToggleableState.On
childCheckedStates.forEachIndexed { index, _ ->
childCheckedStates[index] = newState
}
}
)
}
// Child Checkboxes
childCheckedStates.forEachIndexed { index, checked ->
Row(
verticalAlignment = Alignment.CenterVertically,
) {
Text("Option ${index + 1}")
Checkbox(
checked = checked,
onCheckedChange = { isChecked ->
// Update the individual child state
childCheckedStates[index] = isChecked
}
)
}
}
}
if (childCheckedStates.all { it }) {
Text("All options selected")
}
}
// [END android_compose_components_checkbox_parent]