adding MyScalableRecyclerView
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tibbi
parent
9d028596c5
commit
d281094cdd
3 changed files with 239 additions and 1 deletions
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@ -29,5 +29,5 @@ ext {
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propMinSdkVersion = 16
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propTargetSdkVersion = propCompileSdkVersion
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propVersionCode = 1
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propVersionName = '2.21.4'
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propVersionName = '2.21.7'
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}
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@ -0,0 +1,236 @@
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package com.simplemobiletools.commons.views
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import android.content.Context
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import android.os.Handler
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import android.support.v7.widget.RecyclerView
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import android.util.AttributeSet
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import android.view.MotionEvent
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import android.view.ScaleGestureDetector
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import com.simplemobiletools.commons.R
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// drag selection is based on https://github.com/afollestad/drag-select-recyclerview
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class MyScalableRecyclerView : RecyclerView {
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private val AUTO_SCROLL_DELAY = 25L
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var isZoomingEnabled = false
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var isDragSelectionEnabled = false
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var listener: MyScalableRecyclerViewListener? = null
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private var mScaleDetector: ScaleGestureDetector
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private var dragSelectActive = false
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private var lastDraggedIndex = -1
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private var minReached = 0
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private var maxReached = 0
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private var initialSelection = 0
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private var hotspotHeight = 0
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private var hotspotOffsetTop = 0
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private var hotspotOffsetBottom = 0
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private var hotspotTopBoundStart = 0
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private var hotspotTopBoundEnd = 0
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private var hotspotBottomBoundStart = 0
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private var hotspotBottomBoundEnd = 0
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private var autoScrollVelocity = 0
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private var inTopHotspot = false
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private var inBottomHotspot = false
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private var currScaleFactor = 1.0f
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private var lastUp = 0L // allow only pinch zoom, not double tap
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constructor(context: Context) : super(context)
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constructor(context: Context, attrs: AttributeSet) : super(context, attrs)
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init {
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hotspotHeight = context.resources.getDimensionPixelSize(R.dimen.dragselect_hotspot_height)
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val gestureListener = object : MyGestureListenerInterface {
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override fun getLastUp() = lastUp
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override fun getScaleFactor() = currScaleFactor
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override fun setScaleFactor(value: Float) {
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currScaleFactor = value
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}
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override fun getMainListener() = listener
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}
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mScaleDetector = ScaleGestureDetector(context, GestureListener(gestureListener))
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}
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override fun onMeasure(widthSpec: Int, heightSpec: Int) {
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super.onMeasure(widthSpec, heightSpec)
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if (hotspotHeight > -1) {
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hotspotTopBoundStart = hotspotOffsetTop
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hotspotTopBoundEnd = hotspotOffsetTop + hotspotHeight
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hotspotBottomBoundStart = measuredHeight - hotspotHeight - hotspotOffsetBottom
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hotspotBottomBoundEnd = measuredHeight - hotspotOffsetBottom
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}
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}
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private var autoScrollHandler = Handler()
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private val autoScrollRunnable = object : Runnable {
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override fun run() {
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if (inTopHotspot) {
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scrollBy(0, -autoScrollVelocity)
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autoScrollHandler.postDelayed(this, AUTO_SCROLL_DELAY)
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} else if (inBottomHotspot) {
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scrollBy(0, autoScrollVelocity)
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autoScrollHandler.postDelayed(this, AUTO_SCROLL_DELAY)
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}
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}
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}
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override fun dispatchTouchEvent(ev: MotionEvent): Boolean {
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if (!dragSelectActive)
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super.dispatchTouchEvent(ev)
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when (ev.action) {
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MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
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dragSelectActive = false
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inTopHotspot = false
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inBottomHotspot = false
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autoScrollHandler.removeCallbacks(autoScrollRunnable)
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currScaleFactor = 1.0f
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lastUp = System.currentTimeMillis()
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return true
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}
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MotionEvent.ACTION_MOVE -> {
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if (dragSelectActive) {
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val itemPosition = getItemPosition(ev)
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if (hotspotHeight > -1) {
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if (ev.y in hotspotTopBoundStart..hotspotTopBoundEnd) {
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inBottomHotspot = false
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if (!inTopHotspot) {
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inTopHotspot = true
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autoScrollHandler.removeCallbacks(autoScrollRunnable)
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autoScrollHandler.postDelayed(autoScrollRunnable, AUTO_SCROLL_DELAY)
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}
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val simulatedFactor = (hotspotTopBoundEnd - hotspotTopBoundStart).toFloat()
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val simulatedY = ev.y - hotspotTopBoundStart
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autoScrollVelocity = (simulatedFactor - simulatedY).toInt() / 2
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} else if (ev.y in hotspotBottomBoundStart..hotspotBottomBoundEnd) {
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inTopHotspot = false
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if (!inBottomHotspot) {
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inBottomHotspot = true
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autoScrollHandler.removeCallbacks(autoScrollRunnable)
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autoScrollHandler.postDelayed(autoScrollRunnable, AUTO_SCROLL_DELAY)
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}
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val simulatedY = ev.y + hotspotBottomBoundEnd
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val simulatedFactor = (hotspotBottomBoundStart + hotspotBottomBoundEnd).toFloat()
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autoScrollVelocity = (simulatedY - simulatedFactor).toInt() / 2
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} else if (inTopHotspot || inBottomHotspot) {
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autoScrollHandler.removeCallbacks(autoScrollRunnable)
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inTopHotspot = false
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inBottomHotspot = false
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}
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}
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if (itemPosition != RecyclerView.NO_POSITION && lastDraggedIndex != itemPosition) {
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lastDraggedIndex = itemPosition
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if (minReached == -1) {
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minReached = lastDraggedIndex
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}
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if (maxReached == -1) {
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maxReached = lastDraggedIndex
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}
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if (lastDraggedIndex > maxReached) {
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maxReached = lastDraggedIndex
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}
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if (lastDraggedIndex < minReached) {
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minReached = lastDraggedIndex
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}
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listener?.selectRange(initialSelection, lastDraggedIndex, minReached, maxReached)
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if (initialSelection == lastDraggedIndex) {
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minReached = lastDraggedIndex
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maxReached = lastDraggedIndex
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}
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}
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return true
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}
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}
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}
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return if (isZoomingEnabled)
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mScaleDetector.onTouchEvent(ev)
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else
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true
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}
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fun setDragSelectActive(initialSelection: Int) {
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if (dragSelectActive || !isDragSelectionEnabled)
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return
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lastDraggedIndex = -1
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minReached = -1
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maxReached = -1
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this.initialSelection = initialSelection
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dragSelectActive = true
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listener?.selectItem(initialSelection)
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}
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private fun getItemPosition(e: MotionEvent): Int {
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val v = findChildViewUnder(e.x, e.y) ?: return RecyclerView.NO_POSITION
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if (v.tag == null || v.tag !is RecyclerView.ViewHolder) {
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throw IllegalStateException("Make sure your adapter makes a call to super.onBindViewHolder(), and doesn't override itemView tags.")
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}
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val holder = v.tag as RecyclerView.ViewHolder
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return holder.adapterPosition
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}
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class GestureListener(val gestureListener: MyGestureListenerInterface) : ScaleGestureDetector.SimpleOnScaleGestureListener() {
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private val ZOOM_IN_THRESHOLD = -0.4f
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private val ZOOM_OUT_THRESHOLD = 0.15f
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override fun onScale(detector: ScaleGestureDetector): Boolean {
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gestureListener.apply {
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if (System.currentTimeMillis() - getLastUp() < 1000)
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return false
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val diff = getScaleFactor() - detector.scaleFactor
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if (diff < ZOOM_IN_THRESHOLD && getScaleFactor() == 1.0f) {
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getMainListener()?.zoomIn()
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setScaleFactor(detector.scaleFactor)
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} else if (diff > ZOOM_OUT_THRESHOLD && getScaleFactor() == 1.0f) {
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getMainListener()?.zoomOut()
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setScaleFactor(detector.scaleFactor)
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}
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}
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return false
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}
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}
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interface MyScalableRecyclerViewListener {
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fun zoomOut()
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fun zoomIn()
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fun selectItem(position: Int)
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fun selectRange(initialSelection: Int, lastDraggedIndex: Int, minReached: Int, maxReached: Int)
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}
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interface MyGestureListenerInterface {
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fun getLastUp(): Long
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fun getScaleFactor(): Float
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fun setScaleFactor(value: Float)
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fun getMainListener(): MyScalableRecyclerViewListener?
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}
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}
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@ -19,6 +19,8 @@
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<dimen name="fastscroll_width">6dp</dimen>
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<dimen name="fastscroll_height">40dp</dimen>
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<dimen name="dragselect_hotspot_height">56dp</dimen>
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<dimen name="tiny_text_size">8sp</dimen>
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<dimen name="small_text_size">10sp</dimen>
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<dimen name="smaller_text_size">12sp</dimen>
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