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feat(app): create ui element LargeDropdownMenu
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app/src/main/kotlin/com/intelligentbackpack/app/ui/common/LargeDropdownMenu.kt
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package com.intelligentbackpack.app.ui.common | ||
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import androidx.compose.foundation.clickable | ||
import androidx.compose.foundation.layout.Box | ||
import androidx.compose.foundation.layout.IntrinsicSize | ||
import androidx.compose.foundation.layout.fillMaxSize | ||
import androidx.compose.foundation.layout.fillMaxWidth | ||
import androidx.compose.foundation.layout.height | ||
import androidx.compose.foundation.layout.padding | ||
import androidx.compose.foundation.lazy.LazyColumn | ||
import androidx.compose.foundation.lazy.itemsIndexed | ||
import androidx.compose.foundation.lazy.rememberLazyListState | ||
import androidx.compose.foundation.shape.RoundedCornerShape | ||
import androidx.compose.material.Divider | ||
import androidx.compose.material.Icon | ||
import androidx.compose.material.MaterialTheme | ||
import androidx.compose.material.OutlinedTextField | ||
import androidx.compose.material.Surface | ||
import androidx.compose.material.Text | ||
import androidx.compose.material.TextFieldDefaults | ||
import androidx.compose.material.icons.Icons | ||
import androidx.compose.material.icons.filled.ArrowDropDown | ||
import androidx.compose.material.icons.filled.ArrowDropUp | ||
import androidx.compose.runtime.Composable | ||
import androidx.compose.runtime.LaunchedEffect | ||
import androidx.compose.runtime.getValue | ||
import androidx.compose.runtime.mutableStateOf | ||
import androidx.compose.runtime.remember | ||
import androidx.compose.runtime.setValue | ||
import androidx.compose.ui.Modifier | ||
import androidx.compose.ui.draw.clip | ||
import androidx.compose.ui.graphics.Color | ||
import androidx.compose.ui.unit.dp | ||
import androidx.compose.ui.window.Dialog | ||
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@Composable | ||
fun <T> LargeDropdownMenu( | ||
modifier: Modifier = Modifier, | ||
enabled: Boolean = true, | ||
label: String, | ||
notSetLabel: String? = null, | ||
items: List<T>, | ||
selectedIndex: Int = -1, | ||
onItemSelected: (index: Int, item: T) -> Unit, | ||
selectedItemToString: (T) -> String = { it.toString() }, | ||
drawItem: @Composable (T, Boolean, Boolean, () -> Unit) -> Unit = { item, _, itemEnabled, onClick -> | ||
LargeDropdownMenuItem( | ||
text = item.toString(), | ||
enabled = itemEnabled, | ||
onClick = onClick, | ||
) | ||
}, | ||
) { | ||
var expanded by remember { mutableStateOf(false) } | ||
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Box(modifier = modifier.height(IntrinsicSize.Min)) { | ||
OutlinedTextField( | ||
colors = TextFieldDefaults.outlinedTextFieldColors( | ||
backgroundColor = MaterialTheme.colors.background, | ||
trailingIconColor = MaterialTheme.colors.onBackground, | ||
textColor = MaterialTheme.colors.onBackground, | ||
), | ||
label = { Text(label) }, | ||
value = items.getOrNull(selectedIndex)?.let { selectedItemToString(it) } ?: "", | ||
enabled = enabled, | ||
modifier = Modifier.fillMaxWidth(), | ||
trailingIcon = { | ||
val icon = if (expanded) { | ||
Icons.Filled.ArrowDropUp | ||
} else { | ||
Icons.Filled.ArrowDropDown | ||
} | ||
Icon(icon, "") | ||
}, | ||
onValueChange = { }, | ||
readOnly = true, | ||
) | ||
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// Transparent clickable surface on top of OutlinedTextField | ||
Surface( | ||
modifier = Modifier | ||
.fillMaxSize() | ||
.padding(top = 8.dp) | ||
.clip(MaterialTheme.shapes.small) | ||
.clickable(enabled = enabled) { expanded = true }, | ||
color = Color.Transparent, | ||
) {} | ||
} | ||
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if (expanded) { | ||
Dialog( | ||
onDismissRequest = { expanded = false }, | ||
) { | ||
Surface( | ||
shape = RoundedCornerShape(12.dp), | ||
) { | ||
val listState = rememberLazyListState() | ||
if (selectedIndex > -1) { | ||
LaunchedEffect("ScrollToSelected") { | ||
listState.scrollToItem(index = selectedIndex) | ||
} | ||
} | ||
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LazyColumn(modifier = Modifier.fillMaxWidth(), state = listState) { | ||
if (notSetLabel != null) { | ||
item { | ||
LargeDropdownMenuItem( | ||
text = notSetLabel, | ||
enabled = false, | ||
onClick = { }, | ||
) | ||
} | ||
} | ||
itemsIndexed(items) { index, item -> | ||
val selectedItem = index == selectedIndex | ||
drawItem( | ||
item, | ||
selectedItem, | ||
true, | ||
) { | ||
onItemSelected(index, item) | ||
expanded = false | ||
} | ||
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if (index < items.lastIndex) { | ||
Divider(modifier = Modifier.padding(horizontal = 16.dp)) | ||
} | ||
} | ||
} | ||
} | ||
} | ||
} | ||
} | ||
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@Composable | ||
fun LargeDropdownMenuItem( | ||
text: String, | ||
enabled: Boolean, | ||
onClick: () -> Unit, | ||
) { | ||
Box( | ||
modifier = Modifier | ||
.clickable(enabled) { onClick() } | ||
.fillMaxWidth() | ||
.padding(16.dp), | ||
) { | ||
Text( | ||
text = text, | ||
style = MaterialTheme.typography.button, | ||
) | ||
} | ||
} |