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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.fenix.tabstray.browser
import android.graphics.Canvas
import android.graphics.drawable.Drawable
import androidx.appcompat.content.res.AppCompatResources
import androidx.recyclerview.widget.ItemTouchHelper
import androidx.recyclerview.widget.ItemTouchHelper.ACTION_STATE_IDLE
import androidx.recyclerview.widget.RecyclerView
import mozilla.components.browser.state.state.TabSessionState
import mozilla.components.browser.tabstray.TabTouchCallback
import mozilla.components.browser.tabstray.TabsTray
import mozilla.components.support.ktx.android.content.getColorFromAttr
import mozilla.components.support.ktx.android.content.getDrawableWithTint
import mozilla.components.support.ktx.android.util.dpToPx
import org.mozilla.fenix.R
/**
* A callback for consumers to know when a [RecyclerView.ViewHolder] is about to be touched.
* Return false if the custom behaviour should be ignored.
*/
typealias OnViewHolderTouched = (RecyclerView.ViewHolder) -> Boolean
/**
* A callback for consumers to know when a [RecyclerView.ViewHolder] is about to be drawn.
* Return false if the custom drawing should be ignored.
*/
typealias OnViewHolderToDraw = (RecyclerView.ViewHolder) -> Boolean
/**
* An [ItemTouchHelper] for handling tab swiping to delete.
*
* @param interactionDelegate [TabsTray.Delegate] for handling all user interactions.
* @param onViewHolderTouched See [OnViewHolderTouched].
* @param onViewHolderDraw See [OnViewHolderToDraw].
* @param featureNameHolder Contains the identifying name of the feature.
* @param delegate The Callback which controls the behavior of this touch helper.
*/
class TabsTouchHelper(
interactionDelegate: TabsTray.Delegate,
onViewHolderTouched: OnViewHolderTouched = { true },
onViewHolderDraw: OnViewHolderToDraw = { true },
featureNameHolder: FeatureNameHolder,
delegate: Callback = TouchCallback(interactionDelegate, onViewHolderTouched, onViewHolderDraw, featureNameHolder),
) : ItemTouchHelper(delegate)
/**
* An [ItemTouchHelper.Callback] for drawing custom layouts on [RecyclerView.ViewHolder] interactions.
*
* @param delegate [TabsTray.Delegate] for handling all user interactions.
* @param onViewHolderTouched Invoked when a tab is about to be swiped. See [OnViewHolderTouched].
* @param onViewHolderDraw Invoked when a tab is drawn. See [OnViewHolderToDraw].
* @param featureNameHolder Contains the identifying name of the feature.
* @param onRemove A callback invoked when a tab is removed.
*/
class TouchCallback(
delegate: TabsTray.Delegate,
private val onViewHolderTouched: OnViewHolderTouched,
private val onViewHolderDraw: OnViewHolderToDraw,
featureNameHolder: FeatureNameHolder,
onRemove: (TabSessionState) -> Unit = { delegate.onTabClosed(it, featureNameHolder.featureName) },
) : TabTouchCallback(onRemove) {
override fun getMovementFlags(
recyclerView: RecyclerView,
viewHolder: RecyclerView.ViewHolder,
): Int {
if (!onViewHolderTouched.invoke(viewHolder)) {
return ItemTouchHelper.Callback.makeFlag(ACTION_STATE_IDLE, 0)
}
return super.getMovementFlags(recyclerView, viewHolder)
}
override fun onChildDraw(
c: Canvas,
recyclerView: RecyclerView,
viewHolder: RecyclerView.ViewHolder,
dX: Float,
dY: Float,
actionState: Int,
isCurrentlyActive: Boolean,
) {
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive)
if (!onViewHolderDraw.invoke(viewHolder)) {
return
}
val icon = recyclerView.context.getDrawableWithTint(
R.drawable.ic_delete,
recyclerView.context.getColorFromAttr(R.attr.textCritical),
)!!
val background = AppCompatResources.getDrawable(
recyclerView.context,
R.drawable.swipe_delete_background,
)!!
val itemView = viewHolder.itemView
val iconLeft: Int
val iconRight: Int
val margin =
MARGIN.dpToPx(recyclerView.resources.displayMetrics)
val iconWidth = icon.intrinsicWidth
val iconHeight = icon.intrinsicHeight
val cellHeight = itemView.bottom - itemView.top
val iconTop = itemView.top + (cellHeight - iconHeight) / 2
val iconBottom = iconTop + iconHeight
when {
dX > 0 -> { // Swiping to the right
iconLeft = itemView.left + margin
iconRight = itemView.left + margin + iconWidth
background.setBounds(
itemView.left,
itemView.top,
(itemView.left + dX).toInt() + BACKGROUND_CORNER_OFFSET,
itemView.bottom,
)
icon.setBounds(iconLeft, iconTop, iconRight, iconBottom)
draw(background, icon, c)
}
dX < 0 -> { // Swiping to the left
iconLeft = itemView.right - margin - iconWidth
iconRight = itemView.right - margin
background.setBounds(
(itemView.right + dX).toInt() - BACKGROUND_CORNER_OFFSET,
itemView.top,
itemView.right,
itemView.bottom,
)
icon.setBounds(iconLeft, iconTop, iconRight, iconBottom)
draw(background, icon, c)
}
else -> { // View not swiped
background.setBounds(0, 0, 0, 0)
icon.setBounds(0, 0, 0, 0)
}
}
}
private fun draw(
background: Drawable,
icon: Drawable,
c: Canvas,
) {
background.draw(c)
icon.draw(c)
}
companion object {
const val BACKGROUND_CORNER_OFFSET = 40
const val MARGIN = 32
}
}
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