65 lines
2.7 KiB
Swift
65 lines
2.7 KiB
Swift
//
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// Copyright 2023 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import Foundation
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/// Custom NSAttributedString.Key to specify the theme
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let themeIdentifierAttributeName = NSAttributedString.Key("ThemeIdentifier")
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/// Custom NSAttributedString.Key to specify a theme color by its name
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let themeColorNameAttributeName = NSAttributedString.Key("ThemeColorName")
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extension NSAttributedString {
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/// Fix foreground color attributes if this attributed string contains the `themeIdentifierAttributeName` and `foregroundColorNameAttributeName` attributes
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/// - Returns: a new attributed string with updated colors
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@objc func fixForegroundColor() -> NSAttributedString {
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let activeTheme = ThemeService.shared().theme
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// Check if a theme is defined for this attributed string
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var needUpdate = false
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self.vc_enumerateAttribute(themeIdentifierAttributeName) { (themeIdentifier: String, range: NSRange, _) in
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needUpdate = themeIdentifier != activeTheme.identifier
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}
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guard needUpdate else {
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return self
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}
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// Build a new attributedString with the proper colors if possible
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let mutableAttributedString = NSMutableAttributedString(attributedString: self)
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mutableAttributedString.vc_enumerateAttribute(themeColorNameAttributeName) { (colorName: String, range: NSRange, _) in
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if let color = ThemeColorResolver.getColorByName(colorName) {
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mutableAttributedString.addAttribute(.foregroundColor, value: color, range: range)
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}
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}
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return mutableAttributedString
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}
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}
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extension NSMutableAttributedString {
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/// Adds a theme color name attribute
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/// - Parameters:
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/// - colorName: color name
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/// - range:range for this attribute
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@objc func addThemeColorNameAttribute(_ colorName: String, range: NSRange) {
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self.addAttribute(themeColorNameAttributeName, value: colorName, range: range)
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}
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/// Adds a theme identifier attribute
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@objc func addThemeIdentifierAttribute() {
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self.addAttribute(themeIdentifierAttributeName, value: ThemeService.shared().theme.identifier, range: .init(location: 0, length: length))
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}
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}
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