[fenix] For https://github.com/mozilla-mobile/fenix/issues/176 - Start swipe to close gesture
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/* This Source Code Form is subject to the terms of the Mozilla Public
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License, v. 2.0. If a copy of the MPL was not distributed with this
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file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.fenix.home.sessioncontrol
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import android.content.Context
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import android.content.res.Resources
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import android.graphics.Canvas
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import android.graphics.Paint
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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 io.reactivex.Observer
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import org.mozilla.fenix.DefaultThemeManager
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import org.mozilla.fenix.R
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import org.mozilla.fenix.home.sessioncontrol.viewholders.SessionViewHolder
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import org.mozilla.fenix.home.sessioncontrol.viewholders.TabViewHolder
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import android.graphics.drawable.Drawable
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class SwipeToDeleteCallback(
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val actionEmitter: Observer<SessionControlAction>
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) : ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT or ItemTouchHelper.RIGHT) {
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override fun onMove(
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recyclerView: RecyclerView,
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viewHolder: RecyclerView.ViewHolder,
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target: RecyclerView.ViewHolder
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): Boolean {
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// We don't support drag and drop so this method will never be called
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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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if (viewHolder is TabViewHolder) {
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actionEmitter.onNext(TabAction.Close(viewHolder.tab?.sessionId!!))
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}
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if (viewHolder is SessionViewHolder) {
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viewHolder.session?.apply { actionEmitter.onNext(ArchivedSessionAction.Delete(this)) }
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}
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}
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override fun onChildDraw(
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c: Canvas,
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recyclerView: RecyclerView,
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viewHolder: RecyclerView.ViewHolder,
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dX: Float,
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dY: Float,
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actionState: Int,
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isCurrentlyActive: Boolean
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) {
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super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive)
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val icon = ContextCompat.getDrawable(recyclerView.context, R.drawable.ic_delete)
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val background = ContextCompat.getDrawable(
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recyclerView.context,
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R.drawable.session_background
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)
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background?.let {
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icon?.let {
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val itemView = viewHolder.itemView
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val iconLeft: Int
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val iconRight: Int
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val margin = convertDpToPixel(MARGIN.toFloat())
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val iconWidth = icon.intrinsicWidth
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val iconHeight = icon.intrinsicHeight
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val cellHeight = itemView.bottom - itemView.top
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val iconTop = itemView.top + (cellHeight - iconHeight) / 2
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val iconBottom = iconTop + iconHeight
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when {
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dX > 0 -> { // Swiping to the right
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iconLeft = itemView.left + margin
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iconRight = itemView.left + margin + iconWidth
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background.setBounds(
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itemView.left, itemView.top,
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(itemView.left + dX).toInt() + BACKGROUND_CORNER_OFFSET,
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itemView.bottom
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)
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icon.setBounds(iconLeft, iconTop, iconRight, iconBottom)
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draw(background, icon, c, recyclerView.context, iconLeft, iconBottom)
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}
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dX < 0 -> { // Swiping to the left
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iconLeft = itemView.right - margin - iconWidth
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iconRight = itemView.right - margin
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background.setBounds(
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(itemView.right + dX).toInt() - BACKGROUND_CORNER_OFFSET,
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itemView.top, itemView.right, itemView.bottom
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)
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icon.setBounds(iconLeft, iconTop, iconRight, iconBottom)
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draw(background, icon, c, recyclerView.context, iconLeft, iconBottom)
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}
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else -> { // View not swiped
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background.setBounds(0, 0, 0, 0)
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icon.setBounds(0, 0, 0, 0)
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}
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}
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}
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}
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}
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override fun getSwipeDirs(
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recyclerView: RecyclerView,
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viewHolder: RecyclerView.ViewHolder
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): Int {
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return if (viewHolder is TabViewHolder || viewHolder is SessionViewHolder) super.getSwipeDirs(
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recyclerView,
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viewHolder
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) else 0
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}
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companion object {
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const val BACKGROUND_CORNER_OFFSET = 40
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const val MARGIN = 32
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const val TEXT_MARGIN = 12
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const val TEXT_SIZE = 36f
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const val TEXT_MARGIN_X = 14
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const val DENSITY_CONVERSION = 160f
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@Suppress("LongParameterList")
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private fun draw(
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background: Drawable,
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icon: Drawable,
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c: Canvas,
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context: Context,
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iconLeft: Int,
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iconBottom: Int
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) {
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background.draw(c)
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icon.draw(c)
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val textPaint = Paint()
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textPaint.color = ContextCompat.getColor(
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context,
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DefaultThemeManager.resolveAttribute(R.attr.deleteColor, context)
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)
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textPaint.textSize = TEXT_SIZE
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val textX = iconLeft - TEXT_MARGIN_X
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val textY = iconBottom + convertDpToPixel(TEXT_MARGIN.toFloat())
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c.drawText(
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context.getString(R.string.current_session_delete),
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textX.toFloat(),
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textY.toFloat(),
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textPaint
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)
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}
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private fun convertDpToPixel(dp: Float): Int {
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val metrics = Resources.getSystem().displayMetrics
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val px = dp * (metrics.densityDpi / DENSITY_CONVERSION)
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return Math.round(px)
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}
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}
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}
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