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/*
* 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)
}
}
}
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