Render message text as markdown in the Compose UI kit #6681
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| /* | ||
| * Copyright (c) 2014-2026 Stream.io Inc. All rights reserved. | ||
| * | ||
| * Licensed under the Stream License; | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * https://github.com/GetStream/stream-chat-android/blob/main/LICENSE | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package io.getstream.chat.android.compose.ui.util | ||
|
|
||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.draw.drawBehind | ||
| import androidx.compose.ui.geometry.Offset | ||
| import androidx.compose.ui.geometry.Size | ||
| import androidx.compose.ui.graphics.Color | ||
| import androidx.compose.ui.text.AnnotatedString | ||
| import androidx.compose.ui.text.TextLayoutResult | ||
| import androidx.compose.ui.text.style.ResolvedTextDirection | ||
| import androidx.compose.ui.unit.Density | ||
| import androidx.compose.ui.unit.TextUnit | ||
| import androidx.compose.ui.unit.TextUnitType | ||
| import androidx.compose.ui.unit.dp | ||
|
|
||
| /** | ||
| * Draws the rail beside every rendered line of a block quote, in [color], reading the quotes from | ||
| * the [AnnotationTagBlockQuote] ranges of [annotations] and their extent from [layout]. | ||
| * | ||
| * Drawn rather than written as a marker character, because the lines a quote occupies are only | ||
| * known once the text has been laid out. A character can be placed on a line break the renderer | ||
| * made, never on one the layout chose, and it leaves a gap between lines besides. | ||
| */ | ||
| internal fun Modifier.blockQuoteRails( | ||
| annotations: List<AnnotatedString.Range<String>>, | ||
| layout: () -> TextLayoutResult?, | ||
| color: Color, | ||
| indentPerDepth: TextUnit, | ||
| ): Modifier { | ||
| val quotes = annotations.filter { it.tag == AnnotationTagBlockQuote } | ||
| if (quotes.isEmpty()) return this | ||
| return drawBehind { | ||
| val laidOut = layout() ?: return@drawBehind | ||
| val step = indentPerDepth.toPx(this, laidOut) | ||
| val width = RailWidth.toPx() | ||
| quotes.forEach { quote -> | ||
| val depth = quote.item.toIntOrNull() ?: return@forEach | ||
| // Centred in the space the last level of indent opened up. | ||
| val offset = step * (depth - 1) + (step - width) / 2 | ||
| val lines = laidOut.lineRange(quote) ?: return@forEach | ||
| // Mirrored for a quote running right to left, since the indent it sits in is | ||
| // start-relative. Taken from the paragraph rather than the layout direction, because | ||
| // one message can carry a quote of each direction. | ||
| val left = when (laidOut.getParagraphDirection(quote.start)) { | ||
| ResolvedTextDirection.Rtl -> size.width - offset - width | ||
| else -> offset | ||
| } | ||
| for (line in lines) { | ||
| val top = laidOut.getLineTop(line) | ||
| drawRect( | ||
| color = color, | ||
| topLeft = Offset(left, top), | ||
| size = Size(width, laidOut.getLineBottom(line) - top), | ||
| ) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Every line the quote occupies, blank ones included, so the rail runs unbroken through the gap | ||
| * between two paragraphs of the same quote. | ||
| */ | ||
| private fun TextLayoutResult.lineRange(quote: AnnotatedString.Range<String>): IntRange? { | ||
| val last = (quote.end - 1).coerceAtLeast(quote.start) | ||
| if (quote.start >= layoutInput.text.length) return null | ||
| return getLineForOffset(quote.start)..getLineForOffset(last.coerceAtMost(layoutInput.text.length - 1)) | ||
| } | ||
|
|
||
| /** Resolves against the laid-out font size, since the indent is expressed relative to the text. */ | ||
| private fun TextUnit.toPx(density: Density, layout: TextLayoutResult): Float { | ||
| val fontSize = layout.layoutInput.style.fontSize | ||
| return when { | ||
| type == TextUnitType.Sp -> with(density) { toPx() } | ||
| type == TextUnitType.Em && fontSize.type == TextUnitType.Sp -> | ||
| value * with(density) { fontSize.toPx() } | ||
| else -> 0f | ||
| } | ||
| } | ||
|
|
||
| private val RailWidth = 2.dp | ||
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