82 lines
2.9 KiB
Kotlin
82 lines
2.9 KiB
Kotlin
package org.mozilla.fenix.components
|
|
|
|
/* 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/. */
|
|
|
|
import android.view.ViewGroup
|
|
import androidx.recyclerview.widget.RecyclerView
|
|
import java.lang.IllegalStateException
|
|
|
|
abstract class SectionedAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
|
|
sealed class SectionType {
|
|
data class Header(val index: Int) : SectionType()
|
|
data class Row(val section: Int, val row: Int) : SectionType()
|
|
|
|
val viewType: Int
|
|
get() = when (this) {
|
|
is Header -> HeaderViewType
|
|
is Row -> RowViewType
|
|
}
|
|
|
|
companion object {
|
|
const val HeaderViewType = 0
|
|
const val RowViewType = 1
|
|
}
|
|
}
|
|
|
|
abstract fun numberOfSections(): Int
|
|
abstract fun numberOfRowsInSection(section: Int): Int
|
|
|
|
abstract fun onCreateHeaderViewHolder(parent: ViewGroup): RecyclerView.ViewHolder
|
|
abstract fun onBindHeaderViewHolder(holder: RecyclerView.ViewHolder, header: SectionType.Header)
|
|
abstract fun onCreateItemViewHolder(parent: ViewGroup): RecyclerView.ViewHolder
|
|
abstract fun onBindItemViewHolder(holder: RecyclerView.ViewHolder, row: SectionType.Row)
|
|
|
|
|
|
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
|
|
return when (viewType) {
|
|
SectionType.HeaderViewType -> onCreateHeaderViewHolder(parent)
|
|
SectionType.RowViewType -> onCreateItemViewHolder(parent)
|
|
else -> throw IllegalStateException("ViewType: $viewType is invalid ")
|
|
}
|
|
}
|
|
|
|
override fun getItemViewType(position: Int): Int {
|
|
return sectionTypeForPosition(position).viewType
|
|
}
|
|
|
|
final override fun getItemCount(): Int {
|
|
var count = 0
|
|
for (i in 0 until numberOfSections()) {
|
|
count += numberOfRowsInSection(i) + 1
|
|
}
|
|
|
|
return count
|
|
}
|
|
|
|
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
|
|
val sectionType = sectionTypeForPosition(position)
|
|
|
|
when (sectionType) {
|
|
is SectionType.Header -> onBindHeaderViewHolder(holder, sectionType)
|
|
is SectionType.Row -> onBindItemViewHolder(holder, sectionType)
|
|
}
|
|
}
|
|
|
|
private fun sectionTypeForPosition(position: Int): SectionType {
|
|
var currentPosition = 0
|
|
|
|
for (sectionIndex in 0 until numberOfSections()) {
|
|
if (position == currentPosition) { return SectionType.Header(sectionIndex) }
|
|
currentPosition +=1
|
|
|
|
for (rowIndex in 0 until numberOfRowsInSection(sectionIndex)) {
|
|
if (currentPosition == position) { return SectionType.Row(sectionIndex, rowIndex) }
|
|
currentPosition += 1
|
|
}
|
|
}
|
|
|
|
throw IllegalStateException("hello world!")
|
|
}
|
|
} |