128 lines
4.7 KiB
Kotlin
128 lines
4.7 KiB
Kotlin
/* 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.tabtray
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import android.graphics.Canvas
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import android.graphics.drawable.Drawable
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import androidx.appcompat.content.res.AppCompatResources
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import androidx.recyclerview.widget.ItemTouchHelper
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import androidx.recyclerview.widget.ItemTouchHelper.ACTION_STATE_IDLE
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import androidx.recyclerview.widget.RecyclerView
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import mozilla.components.browser.tabstray.TabTouchCallback
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import mozilla.components.concept.tabstray.TabsTray
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import mozilla.components.support.base.observer.Observable
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import mozilla.components.support.ktx.android.content.getColorFromAttr
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import mozilla.components.support.ktx.android.content.getDrawableWithTint
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import mozilla.components.support.ktx.android.util.dpToPx
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import org.mozilla.fenix.R
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import org.mozilla.fenix.home.sessioncontrol.SwipeToDeleteCallback
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/**
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* A callback for consumers to know when a [RecyclerView.ViewHolder] is about to be touched.
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* Return false if the default behaviour should be ignored.
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*/
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typealias OnViewHolderTouched = (RecyclerView.ViewHolder) -> Boolean
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/**
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* An [ItemTouchHelper] for handling tab swiping to delete.
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*
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* @param onViewHolderTouched See [OnViewHolderTouched].
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*/
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class TabsTouchHelper(
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observable: Observable<TabsTray.Observer>,
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onViewHolderTouched: OnViewHolderTouched = { true },
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delegate: Callback = TouchCallback(observable, onViewHolderTouched)
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) : ItemTouchHelper(delegate)
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/**
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* An [ItemTouchHelper.Callback] for drawing custom layouts on [RecyclerView.ViewHolder] interactions.
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*
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* @param onViewHolderTouched invoked when a tab is about to be swiped. See [OnViewHolderTouched].
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*/
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class TouchCallback(
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observable: Observable<TabsTray.Observer>,
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private val onViewHolderTouched: OnViewHolderTouched
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) : TabTouchCallback(observable) {
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override fun getMovementFlags(
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recyclerView: RecyclerView,
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viewHolder: RecyclerView.ViewHolder
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): Int {
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if (!onViewHolderTouched.invoke(viewHolder)) {
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return ItemTouchHelper.Callback.makeFlag(ACTION_STATE_IDLE, 0)
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}
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return super.getMovementFlags(recyclerView, viewHolder)
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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 = recyclerView.context.getDrawableWithTint(
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R.drawable.ic_delete,
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recyclerView.context.getColorFromAttr(R.attr.destructive)
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)!!
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val background = AppCompatResources.getDrawable(
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recyclerView.context,
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R.drawable.swipe_delete_background
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)!!
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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 =
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SwipeToDeleteCallback.MARGIN.dpToPx(recyclerView.context.resources.displayMetrics)
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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() + SwipeToDeleteCallback.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)
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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() - SwipeToDeleteCallback.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)
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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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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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) {
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background.draw(c)
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icon.draw(c)
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}
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}
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