commonMain.androidx.compose.foundation.lazy.layout.AwaitFirstLayoutModifier.kt Maven / Gradle / Ivy
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Higher level abstractions of the Compose UI primitives. This library is design system agnostic, providing the high-level building blocks for both application and design-system developers
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/*
* Copyright 2023 The Android Open Source Project
*
* 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
*
* http://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 androidx.compose.foundation.lazy.layout
import androidx.compose.ui.layout.LayoutCoordinates
import androidx.compose.ui.layout.OnGloballyPositionedModifier
import kotlin.coroutines.Continuation
import kotlin.coroutines.resume
import kotlin.coroutines.suspendCoroutine
/**
* Internal modifier which allows to delay some interactions (e.g. scroll) until layout is ready.
*/
internal class AwaitFirstLayoutModifier : OnGloballyPositionedModifier {
private var wasPositioned = false
private var continuation: Continuation? = null
suspend fun waitForFirstLayout() {
if (!wasPositioned) {
val oldContinuation = continuation
suspendCoroutine { continuation = it }
oldContinuation?.resume(Unit)
}
}
override fun onGloballyPositioned(coordinates: LayoutCoordinates) {
if (!wasPositioned) {
wasPositioned = true
continuation?.resume(Unit)
continuation = null
}
}
}
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