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Fix stretchy chat colors on Android 12.
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142 changes: 142 additions & 0 deletions
142
app/src/main/java/org/thoughtcrime/securesms/conversation/colors/RecyclerViewColorizer.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| package org.thoughtcrime.securesms.conversation.colors | ||
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| import android.graphics.Canvas | ||
| import android.graphics.Color | ||
| import android.graphics.Paint | ||
| import android.graphics.PorterDuff | ||
| import android.graphics.PorterDuffXfermode | ||
| import android.graphics.Rect | ||
| import android.view.View | ||
| import android.widget.EdgeEffect | ||
| import androidx.recyclerview.widget.LinearLayoutManager | ||
| import androidx.recyclerview.widget.RecyclerView | ||
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| /** | ||
| * Draws the ChatColors color or gradient following this procedure: | ||
| * | ||
| * 1. Have the RecyclerView's ItemDecoration#onDraw method, fill the bounds of the RecyclerView with the background color or drawable | ||
| * 2. Have each child item draw the bubble shape with the "clear" blend mode to "hole punch" a region within the background already drawn by the RecyclerView | ||
| * 3. In the RecyclerView's ItemDecoration#onDrawOver method, draw the gradient with the full bounds of the RecyclerView using the DST_OVER blend mode. This will draw the gradient "underneath" the background rendered in step 1 however will show portions of the gradient in the areas "cleared" by the rendering in step 2 | ||
| */ | ||
| class RecyclerViewColorizer(private val recyclerView: RecyclerView) { | ||
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| private var topEdgeEffect: EdgeEffect? = null | ||
| private var bottomEdgeEffect: EdgeEffect? = null | ||
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| private fun getLayoutManager(): LinearLayoutManager = recyclerView.layoutManager as LinearLayoutManager | ||
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| private var useLayer = false | ||
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| private val noLayerXfermode = PorterDuffXfermode(PorterDuff.Mode.DST_OVER) | ||
| private val layerXfermode = PorterDuffXfermode(PorterDuff.Mode.XOR) | ||
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| private var chatColors: ChatColors? = null | ||
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| fun setChatColors(chatColors: ChatColors) { | ||
| this.chatColors = chatColors | ||
| recyclerView.invalidateItemDecorations() | ||
| } | ||
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| private val edgeEffectFactory = object : RecyclerView.EdgeEffectFactory() { | ||
| override fun createEdgeEffect(view: RecyclerView, direction: Int): EdgeEffect { | ||
| val edgeEffect = super.createEdgeEffect(view, direction) | ||
| when (direction) { | ||
| DIRECTION_TOP -> topEdgeEffect = edgeEffect | ||
| DIRECTION_BOTTOM -> bottomEdgeEffect = edgeEffect | ||
| DIRECTION_LEFT -> Unit | ||
| DIRECTION_RIGHT -> Unit | ||
| } | ||
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| return edgeEffect | ||
| } | ||
| } | ||
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| private val scrollListener = object : RecyclerView.OnScrollListener() { | ||
| override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) { | ||
| super.onScrolled(recyclerView, dx, dy) | ||
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| val firstItemPos = getLayoutManager().findFirstVisibleItemPosition() | ||
| val lastItemPos = getLayoutManager().findLastVisibleItemPosition() | ||
| val itemCount = getLayoutManager().itemCount | ||
| val firstVisible = firstItemPos == 0 && itemCount >= 1 | ||
| val lastVisible = lastItemPos == itemCount - 1 && itemCount >= 1 | ||
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| if (firstVisible || lastVisible || isOverscrolled()) { | ||
| useLayer = true | ||
| recyclerView.setLayerType(View.LAYER_TYPE_HARDWARE, null) | ||
| } else { | ||
| useLayer = false | ||
| recyclerView.setLayerType(View.LAYER_TYPE_NONE, null) | ||
| } | ||
| } | ||
| } | ||
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| private val itemDecoration = object : RecyclerView.ItemDecoration() { | ||
| private val holePunchPaint = Paint().apply { | ||
| xfermode = PorterDuffXfermode(PorterDuff.Mode.CLEAR) | ||
| color = Color.BLACK | ||
| } | ||
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| private val shaderPaint = Paint() | ||
| private val colorPaint = Paint() | ||
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| override fun getItemOffsets(outRect: Rect, view: View, parent: RecyclerView, state: RecyclerView.State) { | ||
| outRect.setEmpty() | ||
| } | ||
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| override fun onDraw(c: Canvas, parent: RecyclerView, state: RecyclerView.State) { | ||
| super.onDraw(c, parent, state) | ||
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| val colors = chatColors ?: return | ||
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| if (useLayer) { | ||
| c.drawColor(Color.WHITE) | ||
| } | ||
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| for (i in 0 until parent.childCount) { | ||
| val child = parent.getChildAt(i) | ||
| if (child != null && child is Colorizable) { | ||
| child.colorizerProjections.forEach { | ||
| c.drawPath(it.path, holePunchPaint) | ||
| } | ||
| } | ||
| } | ||
|
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| drawShaderMask(c, parent, colors) | ||
| } | ||
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| private fun drawShaderMask(canvas: Canvas, parent: RecyclerView, chatColors: ChatColors) { | ||
| if (useLayer) { | ||
| shaderPaint.xfermode = layerXfermode | ||
| colorPaint.xfermode = layerXfermode | ||
| } else { | ||
| shaderPaint.xfermode = noLayerXfermode | ||
| colorPaint.xfermode = noLayerXfermode | ||
| } | ||
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| val shader = chatColors.asShader(0, 0, parent.width, parent.height) | ||
| shaderPaint.shader = shader | ||
| colorPaint.color = chatColors.asSingleColor() | ||
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| canvas.drawRect( | ||
| 0f, | ||
| 0f, | ||
| parent.width.toFloat(), | ||
| parent.height.toFloat(), | ||
| if (shader == null) colorPaint else shaderPaint | ||
| ) | ||
| } | ||
| } | ||
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| init { | ||
| recyclerView.edgeEffectFactory = edgeEffectFactory | ||
| recyclerView.addOnScrollListener(scrollListener) | ||
| recyclerView.addItemDecoration(itemDecoration) | ||
| } | ||
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| private fun isOverscrolled(): Boolean { | ||
| val topFinished = topEdgeEffect?.isFinished ?: true | ||
| val bottomFinished = bottomEdgeEffect?.isFinished ?: true | ||
| return !topFinished || !bottomFinished | ||
| } | ||
| } |
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