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Pinned event : hide/show banner on timeline scroll

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ganfra 2024-07-25 18:37:46 +02:00
parent 56e1957d3d
commit 03a0e4fa08
4 changed files with 67 additions and 5 deletions
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46
libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/utils/LazyListState.kt Normal file
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/*
* Copyright (c) 2024 New Vector Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.element.android.libraries.designsystem.utils
import androidx.compose.foundation.lazy.LazyListState
import androidx.compose.runtime.Composable
import androidx.compose.runtime.derivedStateOf
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
/**
* Returns whether the lazy list is currently scrolling up.
*/
@Composable
fun LazyListState.isScrollingUp(): Boolean {
var previousIndex by remember(this) { mutableIntStateOf(firstVisibleItemIndex) }
var previousScrollOffset by remember(this) { mutableIntStateOf(firstVisibleItemScrollOffset) }
return remember(this) {
derivedStateOf {
if (previousIndex != firstVisibleItemIndex) {
previousIndex > firstVisibleItemIndex
} else {
previousScrollOffset >= firstVisibleItemScrollOffset
}.also {
previousIndex = firstVisibleItemIndex
previousScrollOffset = firstVisibleItemScrollOffset
}
}
}.value
}