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Compose UI primitives. This library contains the primitives that form the Compose UI Toolkit, such as drawing, measurement and layout.

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/*
 * Copyright 2020 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.platform

import androidx.compose.runtime.AbstractApplier
import androidx.compose.ui.node.LayoutNode

internal class DefaultUiApplier(
    root: LayoutNode
) : AbstractApplier(root) {
    override fun insertTopDown(index: Int, instance: LayoutNode) {
        // ignored. Building tree bottom-up
    }

    override fun insertBottomUp(index: Int, instance: LayoutNode) {
        current.insertAt(index, instance)
    }

    override fun remove(index: Int, count: Int) {
        current.removeAt(index, count)
    }

    override fun move(from: Int, to: Int, count: Int) {
        current.move(from, to, count)
    }

    override fun onClear() {
        root.removeAll()
    }

    override fun onEndChanges() {
        super.onEndChanges()
        root.owner?.onEndApplyChanges()
    }
}