Render message text as markdown in the Compose UI kit #6683
There are no files selected for viewing
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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 |
Oops, something went wrong.
Oops, something went wrong.
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Uh oh!
There was an error while loading. Please reload this page.