mirror of https://codeberg.org/tom79/Fedilab
Merge branch 'develop' of https://codeberg.org/tom79/Fedilab into develop
Thomas
3 years ago
commit
1e481e9853
@ -0,0 +1,147 @@
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package app.fedilab.android.helper
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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.DashPathEffect
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import android.graphics.Paint
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import android.graphics.Rect
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import android.view.View
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import androidx.core.content.res.ResourcesCompat
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import androidx.preference.PreferenceManager
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import androidx.recyclerview.widget.DividerItemDecoration
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import androidx.recyclerview.widget.RecyclerView
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import app.fedilab.android.R
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import app.fedilab.android.helper.RecyclerViewThreadLines.LineInfo
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import app.fedilab.android.client.mastodon.entities.Context as StatusContext
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class RecyclerViewThreadLines(context: Context, private val lineInfoList: List<LineInfo>) : DividerItemDecoration(context, VERTICAL) {
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private val lineColors = threadLineColors.map { ResourcesCompat.getColor(context.resources, it, context.theme) }
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private val dashPathEffect = DashPathEffect(floatArrayOf(3.dpToPx, 3.dpToPx), 0F)
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private val borderColor = lineColors[0]
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private val commonPaint = Paint().apply {
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isDither = false
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strokeWidth = 1.5F.dpToPx
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strokeCap = Paint.Cap.BUTT
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strokeJoin = Paint.Join.MITER
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color = borderColor
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}
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private val maxLevel = lineColors.size
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private val fontScale = PreferenceManager.getDefaultSharedPreferences(context).getFloat(context.getString(R.string.SET_FONT_SCALE), 1.1f).toInt()
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private val baseMargin: Int = 6.dpToPx.toInt()
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private val margin: Int = baseMargin * fontScale
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override fun getItemOffsets(outRect: Rect, view: View, parent: RecyclerView, state: RecyclerView.State) {
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val position = (view.layoutParams as RecyclerView.LayoutParams).viewLayoutPosition
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val level = lineInfoList[position].level
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val startMargin = margin * level + margin * fontScale
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if (parent.layoutDirection == View.LAYOUT_DIRECTION_LTR) outRect.left = startMargin else outRect.right = startMargin
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}
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override fun onDraw(c: Canvas, parent: RecyclerView, state: RecyclerView.State) {
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val childCount = parent.childCount
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for (i in 0 until childCount) {
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val view = parent.getChildAt(i)
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val position = parent.getChildAdapterPosition(view)
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val lineInfo = lineInfoList[position]
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val level = lineInfo.level
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for (j in 1..level) {
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val lineMargin = margin * j + 3.dpToPx
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val lineStart = if (parent.layoutDirection == View.LAYOUT_DIRECTION_LTR) lineMargin else c.width - lineMargin
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var lineTop: Float = (view.top - baseMargin).toFloat()
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if (j == 0) lineTop += view.height / 2
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val paint = Paint(commonPaint)
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paint.color = lineColors[j - 1]
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// draw lines for below statuses
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if (j != level && j >= lineInfo.fullLinesStart && j <= lineInfo.fullLinesEnd)
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c.drawLine(lineStart, lineTop, lineStart, view.bottom.toFloat(), paint)
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// draw vertical line for current statuses
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if (j == level) {
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// top the line starts at the middle of the above status
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if (i > 0) lineTop -= parent.getChildAt(i - 1).height / 2 - 1 // '- 1' is to prevent overlapping with above horizontal line
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// bottom of the line ends at the middle of the current status
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var lineBottom = view.bottom.toFloat() - view.height / 2
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// if below status has a full line for current level, extend the line to the bottom
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if (i < childCount - 1) {
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val nextLineInfo = lineInfoList[position + 1]
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if (level >= nextLineInfo.fullLinesStart && level <= nextLineInfo.fullLinesEnd) {
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lineBottom = view.bottom.toFloat()
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}
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}
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// if level is max, use a dashed line
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if (j == maxLevel) paint.pathEffect = dashPathEffect
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c.drawLine(lineStart, lineTop, lineStart, lineBottom, paint)
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}
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// draw horizontal line for current statuses
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if (j == level) {
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lineTop = view.bottom.toFloat() - view.height / 2
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val lineEnd = lineStart + margin * 2
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c.drawLine(lineStart - 1, lineTop, lineEnd, lineTop, paint) // 'lineStart - 1' is to properly connect with the vertical line
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}
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}
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}
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}
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data class LineInfo(var level: Int, var end: Boolean, var fullLinesStart: Int, var fullLinesEnd: Int)
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private val Int.dpToPx: Float
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get() = this * Resources.getSystem().displayMetrics.density
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private val Float.dpToPx: Float
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get() = this * Resources.getSystem().displayMetrics.density
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companion object {
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val threadLineColors = listOf(R.color.decoration_1, R.color.decoration_2, R.color.decoration_3, R.color.decoration_4, R.color.decoration_5)
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}
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}
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fun getThreadDecorationInfo(fediContext: StatusContext, selectedStatusId: String): MutableList<LineInfo> {
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val lineInfoList = mutableListOf<LineInfo>()
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repeat(fediContext.ancestors.size) { lineInfoList.add(LineInfo(0, true, 0, 0)) }
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lineInfoList.add(LineInfo(0, fediContext.descendants.isNotEmpty(), 0, 0))
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val descendantsLineInfoList = List(fediContext.descendants.size) { LineInfo(0, false, 0, 0) }
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for (i in fediContext.descendants.indices) {
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fediContext.descendants[i].let { status ->
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var level = 0
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if (status.in_reply_to_id != null) {
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if (status.in_reply_to_id == selectedStatusId)
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level = 1
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else {
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var replyToId: String? = status.in_reply_to_id
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while (replyToId != null && level < RecyclerViewThreadLines.threadLineColors.size) {
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level += 1
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replyToId = fediContext.descendants.firstOrNull { it.id == replyToId }?.in_reply_to_id
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}
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}
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}
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descendantsLineInfoList[i].level = level
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val firstReply = fediContext.descendants.firstOrNull { it.in_reply_to_id == status.id }
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if (firstReply == null) descendantsLineInfoList[i].end = true
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}
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}
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for (i in descendantsLineInfoList.indices) {
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var fullLinesStart = descendantsLineInfoList[i].level
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var fullLinesEnd = descendantsLineInfoList[i].level
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var fullLinesEndSet = false
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for (j in i + 1 until descendantsLineInfoList.lastIndex) {
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if (!fullLinesEndSet && descendantsLineInfoList[j].level < descendantsLineInfoList[i].level) {
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fullLinesEnd = descendantsLineInfoList[j].level
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fullLinesEndSet = true
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}
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fullLinesStart = descendantsLineInfoList[j].level.coerceAtMost(fullLinesStart)
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}
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descendantsLineInfoList[i].fullLinesStart = fullLinesStart
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descendantsLineInfoList[i].fullLinesEnd = fullLinesEnd
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}
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lineInfoList.addAll(descendantsLineInfoList)
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return lineInfoList
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}
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