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A Dropdown box composable
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| @Composable | |
| fun <T> DropDown( | |
| modifier: Modifier = Modifier, | |
| padding: Dp = 16.dp, | |
| items: List<T>, | |
| defaultIndex: Int = 0, | |
| onValueChanged: (T) -> Unit | |
| ) { | |
| var selectedIndex by remember { mutableStateOf(defaultIndex) } | |
| var itemsExpanded by remember { mutableStateOf(false) } | |
| BoxWithConstraints( | |
| modifier = modifier | |
| .background(Color.LightGray) | |
| .border(1.dp, MaterialTheme.colors.onBackground) | |
| .clickable(onClick = { itemsExpanded = true }) | |
| ) { | |
| Text( | |
| items[selectedIndex].toString(), | |
| modifier = Modifier.padding( | |
| PaddingValues(start = padding, end = padding * 2, top = padding, bottom = padding) | |
| ).wrapContentWidth() | |
| ) | |
| Icon( | |
| Icons.Rounded.ArrowDropDown, | |
| "Drop Down Menu", | |
| modifier = Modifier.align(Alignment.CenterEnd) | |
| ) | |
| DropdownMenu( | |
| expanded = itemsExpanded, | |
| onDismissRequest = { itemsExpanded = false }, | |
| ) { | |
| items.forEachIndexed { index, item -> | |
| DropdownMenuItem(onClick = { | |
| selectedIndex = index | |
| itemsExpanded = false | |
| onValueChanged(items[index]) | |
| }) { | |
| Text(text = item.toString()) | |
| } | |
| } | |
| } | |
| } | |
| } |
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