72 lines
2.7 KiB
Swift
72 lines
2.7 KiB
Swift
//
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// Copyright (c) 2022 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the Software), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import CoreGraphics
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import Foundation.NSAttributedString
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import CoreText
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public struct TextDrawingOperation: OrientationAwareDrawingOperation {
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public var text: String
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public var textAttributes: [NSAttributedString.Key: Any]
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public var flipHorizontallyDuringDrawing: Bool
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public var desiredOffset: CGPoint
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public var attributedString: NSAttributedString {
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NSAttributedString(string: text, attributes: textAttributes)
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}
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public var line: CTLine {
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CTLineCreateWithAttributedString(attributedString)
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}
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public var desiredContextSize: CGSize {
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let imageBounds = CTLineGetImageBounds(line, nil)
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return CGSize(width: max(imageBounds.width, imageBounds.maxX) + desiredOffset.x,
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height: max(imageBounds.height, imageBounds.maxY) + desiredOffset.y)
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}
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public init(text: String,
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textAttributes: [NSAttributedString.Key: Any],
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flipHorizontallyDuringDrawing: Bool = true,
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desiredOffset: CGPoint = .zero) {
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self.text = text
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self.textAttributes = textAttributes
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self.flipHorizontallyDuringDrawing = flipHorizontallyDuringDrawing
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self.desiredOffset = desiredOffset
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}
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// MARK: - DrawingOperation
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public func affectedArea(in context: CGContext? = nil) -> CGRect {
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CTLineGetImageBounds(line, context).offset(by: desiredOffset)
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}
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public func apply(in context: CGContext) {
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apply(in: context) {
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$0.textPosition = offsetForDrawing(affectedArea(in: context).origin)
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CTLineDraw(line, $0)
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}
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}
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}
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