Fixes crashes in WallpaperPicker2 app on AOSP

/*

 * 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.customization.picker

import android.content.Context

import android.util.AttributeSet

import android.view.MotionEvent

import android.view.ViewConfiguration

import androidx.core.widget.NestedScrollView

import kotlin.math.abs

/**

 * This nested scroll view will detect horizontal touch movements and stop vertical scrolls when a

 * horizontal touch movement is detected.

 */

class HorizontalTouchMovementAwareNestedScrollView(context: Context, attrs: AttributeSet?) :

    NestedScrollView(context, attrs) {

    private var startXPosition = 0f

    private var startYPosition = 0f

    private var isHorizontalTouchMovement = false

    override fun onInterceptTouchEvent(event: MotionEvent): Boolean {

        when (event.action) {

            MotionEvent.ACTION_DOWN -> {

                startXPosition = event.x

                startYPosition = event.y

                isHorizontalTouchMovement = false

            }

            MotionEvent.ACTION_MOVE -> {

                val xMoveDistance = abs(event.x - startXPosition)

                val yMoveDistance = abs(event.y - startYPosition)

                if (

                    !isHorizontalTouchMovement &&

                        xMoveDistance > yMoveDistance &&

                        xMoveDistance > ViewConfiguration.get(context).scaledTouchSlop

                ) {

                    isHorizontalTouchMovement = true

                }

            }

            else -> {}

        }

        return if (isHorizontalTouchMovement) {

            // We only want to intercept the touch event when the touch moves more vertically than

            // horizontally. So we return false.

            false

        } else {

            super.onInterceptTouchEvent(event)

        }

    }

}