ExposedDropdownMenuBox

ExposedDropdownMenuSample

@OptIn(ExperimentalMaterialApi::class)
@Sampled
@Composable
fun ExposedDropdownMenuSample() {
    val options = listOf("Option 1", "Option 2", "Option 3", "Option 4", "Option 5")
    var expanded by remember { mutableStateOf(false) }
    val textFieldState = rememberTextFieldState(options[0])
    // We want to react on tap/press on TextField to show menu
    ExposedDropdownMenuBox(expanded = expanded, onExpandedChange = { expanded = it }) {
        TextField(
            readOnly = true,
            state = textFieldState,
            label = { Text("Label") },
            trailingIcon = { ExposedDropdownMenuDefaults.TrailingIcon(expanded = expanded) },
            colors = ExposedDropdownMenuDefaults.textFieldColors(),
        )
        ExposedDropdownMenu(expanded = expanded, onDismissRequest = { expanded = false }) {
            options.forEach { selectionOption ->
                DropdownMenuItem(
                    onClick = {
                        textFieldState.setTextAndPlaceCursorAtEnd(selectionOption)
                        expanded = false
                    }
                ) {
                    Text(text = selectionOption)
                }
            }
        }
    }
}

EditableExposedDropdownMenuSample

@OptIn(ExperimentalMaterialApi::class)
@Sampled
@Composable
fun EditableExposedDropdownMenuSample() {
    val options = listOf("Option 1", "Option 2", "Option 3", "Option 4", "Option 5")
    var expanded by remember { mutableStateOf(false) }
    val textFieldState = rememberTextFieldState()
    ExposedDropdownMenuBox(expanded = expanded, onExpandedChange = { expanded = it }) {
        TextField(
            state = textFieldState,
            label = { Text("Label") },
            trailingIcon = { ExposedDropdownMenuDefaults.TrailingIcon(expanded = expanded) },
            colors = ExposedDropdownMenuDefaults.textFieldColors(),
        )
        // filter options based on text field value
        val filteringOptions = options.filter {
            it.contains(textFieldState.text, ignoreCase = true)
        }
        if (filteringOptions.isNotEmpty()) {
            ExposedDropdownMenu(expanded = expanded, onDismissRequest = { expanded = false }) {
                filteringOptions.forEach { selectionOption ->
                    DropdownMenuItem(
                        onClick = {
                            textFieldState.setTextAndPlaceCursorAtEnd(selectionOption)
                            expanded = false
                        }
                    ) {
                        Text(text = selectionOption)
                    }
                }
            }
        }
    }
}