Class ValdiScrollView

valdi/src/java/com/snap/valdi/views/ValdiScrollView.kt:39–961

* A scroll view container that uses Yoga for its layout and can be either * horizontal or vertical. */

 * horizontal or vertical.
 */
@Keep
open class ValdiScrollView(context: Context) : ValdiView(context, attributeSet(context)),
        ValdiScrollableView, CustomChildViewAppender, Runnable, DragGestureRecognizerListener {

    companion object {
        fun attributeSet(context: Context): AttributeSet? {
            return if (Build.VERSION.SDK_INT == Build.VERSION_CODES.KITKAT) {
                try {
                    val parser = context.resources.getXml(com.snapchat.client.R.xml.valdi_scroll_view_kitkat)
                    parser.next()
                    parser.nextTag()
                    asAttributeSet(parser)
                } catch (e: Exception) {
                    null
                }
            } else {
                null
            }
        }

        val flingDecelerationRate = 0.998
        val flingDecelerationCoefficient = 1000 * Math.log(flingDecelerationRate)
        val flingDecelerationCorrection = 1 / -flingDecelerationCoefficient
        
        // Android's native fading edge works well up to ~40px. Beyond this, use custom implementation.
        const val NATIVE_FADE_THRESHOLD = 40
    }

    // TODO(796) - deprecate, only used in android on legacy tray integration
    interface ScrollChangeListener {
        fun onScrollChange(newOffset: Int, oldOffset: Int)
    }

    var onScrollChangeListener: ScrollChangeListener? = null

    var scrollEnabled: Boolean = true
    var pagingEnabled: Boolean = false

    var scrollPerfLoggerBridge: IScrollPerfLoggerBridge? = null
        set(value) {
            if (field != value) {
                pauseScrollPerfLogger()
                field = value
            }
        }

    val contentView = ValdiView(context)

    val coordinateResolver = CoordinateResolver(context)

    var contentWidth: Int = 0
        private set
    var contentHeight: Int = 0
        private set

    var contentOffsetX: Int = 0
        private set
    var contentOffsetY: Int = 0