Android Compose DockedSearchBar 使用示例

kotlin 复制代码
package com.example.myapplication.ui.menu

import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material.icons.filled.Search
import androidx.compose.material.icons.filled.Star
import androidx.compose.material3.DockedSearchBar
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.ListItem
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun DockedSearchBarSample() {
    var text by rememberSaveable { mutableStateOf("") }
    var active by rememberSaveable { mutableStateOf(false) }

    Text(text = "new TLEs ")
    Box(Modifier.fillMaxSize()) {
        DockedSearchBar(
            modifier = Modifier
                .align(Alignment.TopCenter)
                .padding(top = 8.dp),
            query = text,
            onQueryChange = { text = it },
            onSearch = { active = false },
            active = active,
            onActiveChange = { active = it },
            placeholder = { Text("Hinted search text") },
            leadingIcon = { Icon(Icons.Default.Search, contentDescription = null) },
            trailingIcon = { Icon(Icons.Default.MoreVert, contentDescription = null) },
        ) {
            repeat(4) { idx ->
                val resultText = "Suggestion $idx"
                ListItem(
                    headlineContent = { Text(resultText) },
                    supportingContent = { Text("Additional info") },
                    leadingContent = { Icon(Icons.Filled.Star, contentDescription = null) },
                    modifier = Modifier
                        .clickable {
                            text = resultText
                            active = false
                        }
                        .fillMaxWidth()
                        .padding(horizontal = 16.dp, vertical = 4.dp)
                )
            }
        }

        LazyColumn(
            contentPadding = PaddingValues(start = 16.dp, top = 72.dp, end = 16.dp, bottom = 16.dp),
            verticalArrangement = Arrangement.spacedBy(8.dp)
        ) {
            val list = List(100) { "Text $it" }
            items(count = list.size) {
                Text(list[it],
                    Modifier
                        .fillMaxWidth()
                        .padding(horizontal = 16.dp))
            }
        }
    }
}


@Preview
@Composable
fun DockedSearchBarPreview() {
    DockedSearchBarSample()
}