ModifierLocalProviderNode.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.modifier.ModifierLocal
import androidx.compose.ui.modifier.ModifierLocalProvider
internal class ModifierLocalProviderNode <T> (
wrapped: LayoutNodeWrapper,
modifier: ModifierLocalProvider<T>
) : DelegatingLayoutNodeWrapper<ModifierLocalProvider<T>>(wrapped, modifier) {
override fun <V> onModifierLocalRead(modifierLocal: ModifierLocal<V>): V {
return if (modifier.key == modifierLocal) {
// We need a cast because type information is erased.
// When we check for equality of the key it implies that the types are equal too.
@Suppress("UNCHECKED_CAST")
modifier.value as V
} else {
super.onModifierLocalRead(modifierLocal)
}
}
}