OnPlacedModifierWrapper.kt
/*
* Copyright 2021 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.ui.node
import androidx.compose.ui.ExperimentalComposeUiApi
import androidx.compose.ui.layout.AlignmentLine
import androidx.compose.ui.layout.OnPlacedModifier
/**
* Wrapper around the [OnPlacedModifier].
*/
@OptIn(ExperimentalComposeUiApi::class)
internal class OnPlacedModifierWrapper constructor(
wrapped: LayoutNodeWrapper,
modifier: OnPlacedModifier
) : DelegatingLayoutNodeWrapper<OnPlacedModifier>(wrapped, modifier) {
override val providedAlignmentLines: Set<AlignmentLine>
get() {
val result = mutableSetOf<AlignmentLine>()
layoutNode
var wrapper = wrapped as LayoutNodeWrapper?
while (wrapper != null) {
result += wrapper.providedAlignmentLines
if (wrapper == layoutNode.innerLayoutNodeWrapper) break
wrapper = wrapper.wrapped
}
return result
}
override fun onPlaced() {
// Invoke the onPlaced callback.
modifier.onPlaced(this)
}
}