Implement better swipe to reply gesture
Niels Andriesse
3 years ago
parent
fed95ce784
commit
834ac1106b
@ -0,0 +1,40 @@
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package org.thoughtcrime.securesms.conversation.v2
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import android.content.Context
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import android.util.AttributeSet
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import android.view.MotionEvent
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import android.view.VelocityTracker
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import androidx.recyclerview.widget.RecyclerView
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import kotlin.math.abs
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class ConversationRecyclerView : RecyclerView {
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private var velocityTracker: VelocityTracker? = null
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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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constructor(context: Context, attrs: AttributeSet, defStyleAttr: Int) : super(context, attrs, defStyleAttr)
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override fun onInterceptTouchEvent(e: MotionEvent): Boolean {
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return false
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/*
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val velocityTracker = velocityTracker ?: return super.onInterceptTouchEvent(e)
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velocityTracker.computeCurrentVelocity(1000) // Specifying 1000 gives pixels per second
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val vx = velocityTracker.xVelocity
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val vy = velocityTracker.yVelocity
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// Only allow swipes to the left; allowing swipes to the right interferes with some back gestures
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if (vx > 0) { return super.onInterceptTouchEvent(e) }
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// Return false if abs(v.x) > abs(v.y) so that only swipes that are more horizontal than vertical
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// get passed on to the message view
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return abs(vx) < abs(vy)
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*/
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}
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override fun onTouchEvent(e: MotionEvent): Boolean {
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when (e.action) {
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MotionEvent.ACTION_DOWN -> velocityTracker = VelocityTracker.obtain()
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MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> velocityTracker = null
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}
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velocityTracker?.addMovement(e)
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return super.onTouchEvent(e)
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}
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}
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@ -1,72 +0,0 @@
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package org.thoughtcrime.securesms.conversation.v2
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import android.content.Context
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import android.graphics.Canvas
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import android.graphics.Rect
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import android.view.HapticFeedbackConstants
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import androidx.core.content.ContextCompat
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import androidx.recyclerview.widget.ItemTouchHelper
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import androidx.recyclerview.widget.RecyclerView
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import kotlinx.android.synthetic.main.view_visible_message.view.*
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import network.loki.messenger.R
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import org.thoughtcrime.securesms.conversation.v2.messages.VisibleMessageView
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import org.thoughtcrime.securesms.loki.utilities.toDp
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import org.thoughtcrime.securesms.loki.utilities.toPx
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import kotlin.math.abs
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import kotlin.math.min
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import kotlin.math.roundToInt
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class ConversationTouchHelperCallback(private val adapter: ConversationAdapter, private val context: Context,
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private val onSwipe: (Int) -> Unit) : ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT) {
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private val background = ContextCompat.getDrawable(context, R.drawable.ic_baseline_reply_24)!!
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private var previousX: Float = 0.0f
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companion object {
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const val swipeToReplyThreshold = 200.0f // dp
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}
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override fun onMove(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder, target: RecyclerView.ViewHolder): Boolean {
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return false
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}
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override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
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background.alpha = 0
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adapter.notifyItemChanged(viewHolder.adapterPosition)
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}
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override fun onChildDraw(c: Canvas, recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder,
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dX: Float, dY: Float, actionState: Int, isCurrentlyActive: Boolean) {
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val adjustedDistanceInPx = dX / 4
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super.onChildDraw(c, recyclerView, viewHolder, adjustedDistanceInPx, dY, actionState, isCurrentlyActive)
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val absDistanceInDp = abs(toDp(dX, context.resources))
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val threshold = ConversationTouchHelperCallback.swipeToReplyThreshold
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val view = viewHolder.itemView
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if (view !is VisibleMessageView) { return }
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// Draw the background
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val messageContentView = view.messageContentView
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if (dX < 0) { // Swipe to the left
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val alpha = min(absDistanceInDp, threshold) / threshold
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background.alpha = (alpha * 255.0f).roundToInt()
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val spacing = context.resources.getDimension(R.dimen.medium_spacing).toInt()
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val itemViewTop = viewHolder.itemView.top
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val itemViewBottom = viewHolder.itemView.bottom
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val height = itemViewBottom - itemViewTop
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val iconSize = toPx(24, context.resources)
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val offset = (height - iconSize) / 2
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background.bounds = Rect(
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messageContentView.right + adjustedDistanceInPx.toInt() + spacing,
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itemViewTop + offset,
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messageContentView.right + adjustedDistanceInPx.toInt() + iconSize + spacing,
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itemViewTop + offset + iconSize
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)
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}
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background.draw(c)
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// Perform haptic feedback and invoke onSwipe callback if threshold has been reached
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if (absDistanceInDp > threshold && previousX < threshold) {
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view.isHapticFeedbackEnabled = true
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view.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS)
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onSwipe(viewHolder.adapterPosition)
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}
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previousX = absDistanceInDp
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}
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}
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