Add WindowRootView for Underlay.

/*

 * Copyright (C) 2025 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 com.android.systemui.underlay.ui.view

import android.content.Context

import android.view.Gravity

import android.view.ViewGroup

import android.widget.FrameLayout

import androidx.compose.ui.platform.ComposeView

import com.android.systemui.compose.ComposeInitializer

/** A root view of the Underlay SysUI window. */

class UnderlayWindowRootView(context: Context) : FrameLayout(context) {

    init {

        layoutParams =

            ViewGroup.LayoutParams(

                /* width = */ LayoutParams.MATCH_PARENT,

                /* height = */ LayoutParams.WRAP_CONTENT,

            )

        val composeView =

            ComposeView(context).apply {

                layoutParams =

                    LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT).apply {

                        gravity = Gravity.CENTER_VERTICAL

                    }

            }

        addView(composeView)

    }

    override fun onAttachedToWindow() {

        super.onAttachedToWindow()

        ComposeInitializer.onAttachedToWindow(this)

    }

    override fun onDetachedFromWindow() {

        super.onDetachedFromWindow()

        ComposeInitializer.onDetachedFromWindow(this)

    }

}