src/com/android/wallpaper/picker/FixedWidthDisplayRatioFrameLayout.kt

/*
 * Copyright (C) 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 com.android.wallpaper.picker

import android.content.Context
import android.util.AttributeSet
import android.widget.FrameLayout
import androidx.core.view.children
import com.android.wallpaper.util.ScreenSizeCalculator

/**
 * [FrameLayout] that sizes itself and its children layout with a given fixed width and a calculated
 * height according to the screen aspect ratio.
 */
class FixedWidthDisplayRatioFrameLayout(
    context: Context,
    attrs: AttributeSet?,
) : FrameLayout(context, attrs) {

    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        val screenAspectRatio = ScreenSizeCalculator.getInstance().getScreenAspectRatio(context)
        val width = MeasureSpec.getSize(widthMeasureSpec)
        val height = (width * screenAspectRatio).toInt()
        super.onMeasure(
            MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
            MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY),
        )
        children.forEach { child ->
            child.measure(
                MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
                MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY),
            )
        }
    }
}