1 /*
2  * Copyright (C) 2022 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.settingslib.spa.framework.compose
18 
19 import androidx.compose.foundation.lazy.LazyListState
20 import androidx.compose.foundation.lazy.rememberLazyListState
21 import androidx.compose.runtime.Composable
22 import androidx.compose.runtime.LaunchedEffect
23 import androidx.compose.runtime.snapshotFlow
24 import androidx.compose.ui.ExperimentalComposeUiApi
25 import androidx.compose.ui.platform.LocalSoftwareKeyboardController
26 import kotlinx.coroutines.flow.distinctUntilChanged
27 import kotlinx.coroutines.flow.filter
28 
29 /**
30  * An action when run, hides the keyboard if it's open.
31  */
32 @OptIn(ExperimentalComposeUiApi::class)
33 @Composable
34 fun hideKeyboardAction(): () -> Unit {
35     val keyboardController = LocalSoftwareKeyboardController.current
36     return { keyboardController?.hide() }
37 }
38 
39 /**
40  * Creates a [LazyListState] that is remembered across compositions.
41  *
42  * And when user scrolling the lazy list, hides the keyboard if it's open.
43  */
44 @OptIn(ExperimentalComposeUiApi::class)
45 @Composable
46 fun rememberLazyListStateAndHideKeyboardWhenStartScroll(): LazyListState {
47     val listState = rememberLazyListState()
48     val keyboardController = LocalSoftwareKeyboardController.current
49     LaunchedEffect(listState) {
50         snapshotFlow { listState.isScrollInProgress }
51             .distinctUntilChanged()
52             .filter { it }
53             .collect { keyboardController?.hide() }
54     }
55     return listState
56 }
57