DropdownMenu in Jetpack Compose
I have a problem about DropdownMenu. When I click the Morevert Icon, the menu opens on the left, I want it to open on the right. I have a TextField (weight=6f
) and Morevert Icon (weight=1f
) in a Row
. I don't understand why it opens on the left. Thanks for any help.
Here is my code:
@Composable
fun HistorySearchBar(
text: String,
onTextChange: (String) -> Unit,
onCloseClicked: () -> Unit,
onSearchClicked: (String) -> Unit
) {
val focusRequester = remember { FocusRequester() }
val focus = remember { mutableStateOf(false) }
var showMenu by remember { mutableStateOf(false) }
val inputService = LocalTextInputService.current
Surface(
modifier = Modifier
.fillMaxWidth()
.height(56.dp),
elevation = AppBarDefaults.TopAppBarElevation,
color = MaterialTheme.colors.primary
) {
Row(modifier = Modifier.fillMaxWidth()) {
TextField(
modifier = Modifier.weight(6f)
.focusRequester(focusRequester)
.onFocusChanged {
if (focus.value != it.isFocused) {
focus.value = it.isFocused
if (!it.isFocused) {
onTextChange("")
inputService?.hideSoftwareKeyboard()
}
}
},
value = text,
onValueChange = {
onTextChange(it)
},
placeholder = {
Text(
modifier = Modifier.alpha(ContentAlpha.medium),
text = "Search in History...",
color = Color.White
)
},
textStyle = TextStyle(
fontSize = MaterialTheme.typography.subtitle1.fontSize
),
singleLine = true,
trailingIcon = {
if(text.isNotEmpty()) {
IconButton(
onClick = {
if (text.isNotEmpty()) {
onTextChange("")
} else {
onCloseClicked()
}
}) {
Icon(
imageVector = Icons.Default.Close,
contentDescription = "Search Icon",
tint = Color.White
)
}
}}
,
keyboardOptions = KeyboardOptions(
imeAction = ImeAction.Search
),
keyboardActions = KeyboardActions(
onSearch = {
onSearchClicked(text)
}
),
colors = TextFieldDefaults.textFieldColors(
backgroundColor = Color.Transparent,
cursorColor = Color.White.copy(alpha = ContentAlpha.medium)
)
)
IconButton(onClick = { showMenu = !showMenu}, modifier = Modifier.weight(1f)) {
Icon(Icons.Default.MoreVert, "")
}
DropdownMenu(
expanded = showMenu,
onDismissRequest = { showMenu = false }) {
DropdownMenuItem(onClick = { }) {
Text(text= "Clear All History")
}
}
}
}
}
Solution 1:
A DropdownMenu behaves similarly to a Popup, and will use the position of the parent layout to position itself on screen. Commonly a DropdownMenu will be placed in a Box with a sibling that will be used as the 'anchor'.
Currently the parent of DropdownMenu
is the Surface
whose position is upper-left corner.
You can move DropdownMenu()
in the IconButton()
; or even better wrap both DropdownMenu()
and IconButton()
in a Box()
. Dropdown menu will use the box's position to calculate it's own position and IconButton will act as an anchor.
@Composable
fun HistorySearchBar(
text: String,
) {
var showMenu by remember { mutableStateOf(false) }
Surface(
modifier = Modifier
.fillMaxWidth()
.height(56.dp),
elevation = AppBarDefaults.TopAppBarElevation,
color = MaterialTheme.colors.primary
) {
Row(modifier = Modifier.fillMaxWidth()) {
TextField(...
)
Box(modifier = Modifier.weight(1f)){
IconButton(onClick = { showMenu = !showMenu }) {
Icon(Icons.Default.MoreVert, "")
}
DropdownMenu(
expanded = showMenu,
onDismissRequest = { showMenu = false }) {
DropdownMenuItem(onClick = { }) {
Text(text = "Clear All History")
}
}
}
}
}
}