mirror of
https://github.com/Novaloop-AG/element-x-ios.git
synced 2026-10-31 16:24:11 +00:00
Mauro Romito
b65e8f6a7c
Components of a formatted body were identified by their plain characters, so an edit that only added formatting (e.g. wrapping a word in inline code) kept the same ID. SwiftUI then reused the existing MessageText, whose @State string ignores new input, and the old unformatted text kept rendering. Identify components by the hash of their attributed string so formatting changes produce a new ID.
88 lines
3.7 KiB
Swift
88 lines
3.7 KiB
Swift
//
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// Copyright 2025 Element Creations Ltd.
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// Copyright 2023-2025 New Vector Ltd.
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//
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// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
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// Please see LICENSE files in the repository root for full details.
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//
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import Foundation
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nonisolated extension AttributedString {
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/// faster than doing `String(characters)`: https://forums.swift.org/t/attributedstring-to-string/61667
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var string: String {
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String(characters[...])
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}
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var formattedComponents: [AttributedStringBuilderComponent] {
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var components = [AttributedStringBuilderComponent]()
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for run in runs[\.blockquote, \.codeBlock, \.details] {
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let isBlockquote = run.0 != nil
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let isCodeBlock = run.1 != nil
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let details = run.2
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var attributedString = AttributedString(self[run.3])
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// Remove trailing new lines if any
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if attributedString.characters.last?.isNewline ?? false,
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let range = attributedString.range(of: "\n", options: .backwards, locale: nil) {
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attributedString.removeSubrange(range)
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}
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let componentType: AttributedStringBuilderComponent.ComponentType = switch (details, isBlockquote, isCodeBlock) {
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case (.some(let summary), _, _):
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.details(summary: summary)
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case (_, true, _):
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.blockquote
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case (_, false, true):
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.codeBlock
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case (_, false, false):
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.plainText
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}
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// Hash attributes as well as characters so formatting-only edits change the ID and refresh the view.
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components.append(AttributedStringBuilderComponent(id: String(attributedString.hashValue),
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attributedString: attributedString,
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type: componentType))
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}
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return components
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}
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/// Replaces the specified placeholder with the supplied attributed string.
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/// - Parameters:
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/// - placeholder: The text in the string that will be replaced. Make sure this is unique within the string.
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/// - attributedString: The text for the link that will be substituted into the placeholder.
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mutating func replace(_ placeholder: String, with replacement: AttributedString) {
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guard let range = range(of: placeholder) else {
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MXLog.failure("Failed to find the placeholder to be replaced.")
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return
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}
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// Replace the placeholder.
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replaceSubrange(range, with: replacement)
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}
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/// Returns a new attributed string, created by replacing any hard coded `UIFont` with
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/// a simple presentation intent. This allows simple formatting to respond to Dynamic Type.
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///
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/// Currently only supports regular and bold weights.
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func replacingFontWithPresentationIntent() -> AttributedString {
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var newValue = self
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for run in newValue.runs {
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guard let font = run.uiKit.font else { continue }
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newValue[run.range].inlinePresentationIntent = font.fontDescriptor.symbolicTraits.contains(.traitBold) ? .stronglyEmphasized : nil
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newValue[run.range].uiKit.font = nil
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}
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return newValue
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}
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/// Makes the entire string bold by setting the presentation intent to strongly emphasized.
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///
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/// In practice, this is rendered as semibold for smaller font sizes and just so happens to nicely
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/// line up with the semibold → bold font switch used by compound.
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mutating func bold() {
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self[startIndex..<endIndex].inlinePresentationIntent = .stronglyEmphasized
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}
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}
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