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Code Issues Packages Projects Releases Wiki Activity

Retain scroll position when selecting app theme preference

Browse Source 
Co-authored-by: Jays2Kings <Jays2Kings@users.noreply.github.com>
This commit is contained in:
arkon
2021-09-04 11:58:44 -04:00
parent 069f4e12d8
commit 0de3558ab3
2 changed files with 57 additions and 8 deletions
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40
app/src/main/java/eu/kanade/tachiyomi/widget/preference/ThemesPreference.kt
View File

@@ -8,13 +8,23 @@ import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import eu.kanade.tachiyomi.R
import eu.kanade.tachiyomi.data.preference.PreferenceValues
import eu.kanade.tachiyomi.util.system.dpToPx
class ThemesPreference @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null) :
ListPreference(context, attrs),
ThemesPreferenceAdapter.OnItemClickListener {
private var recycler: RecyclerView? = null
private val adapter = ThemesPreferenceAdapter(this)
var lastScrollPosition: Int? = null
var entries: List<PreferenceValues.AppTheme> = emptyList()
set(value) {
field = value
adapter.setItems(value)
}
init {
layoutResource = R.layout.pref_themes_list
}
@@ -22,9 +32,18 @@ class ThemesPreference @JvmOverloads constructor(context: Context, attrs: Attrib
override fun onBindViewHolder(holder: PreferenceViewHolder) {
super.onBindViewHolder(holder)
val themesList = holder.findViewById(R.id.themes_list) as RecyclerView
themesList.layoutManager = LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false)
themesList.adapter = adapter
recycler = holder.findViewById(R.id.themes_list) as RecyclerView
recycler?.layoutManager = LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false)
recycler?.adapter = adapter
// Retain scroll position on activity recreate after changing theme
recycler?.addOnScrollListener(object : RecyclerView.OnScrollListener() {
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
lastScrollPosition = recyclerView.computeHorizontalScrollOffset()
}
})
lastScrollPosition?.let { scrollToOffset(it) }
}
override fun onItemClick(position: Int) {
@@ -36,9 +55,16 @@ class ThemesPreference @JvmOverloads constructor(context: Context, attrs: Attrib
// no-op; not actually a DialogPreference
}
var entries: List<PreferenceValues.AppTheme> = emptyList()
set(value) {
field = value
adapter.setItems(value)
private fun scrollToOffset(lX: Int) {
recycler?.let {
(it.layoutManager as LinearLayoutManager).apply {
scrollToPositionWithOffset(
// 118dp is the width of the pref_theme_item layout
lX / 118.dpToPx,
-lX % 118.dpToPx
)
}
lastScrollPosition = it.computeHorizontalScrollOffset()
}
}
}