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Add support for scaling images and containing image #128

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Add support for scaling images and containing image #128

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a2efb8c
add support for scaling images and containing image width within prop…
dnek Jun 1, 2022
d97cecb
fix typo
dnek Jun 1, 2022
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29 changes: 27 additions & 2 deletions Sources/SwiftyMarkdown/SwiftyMarkdown.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -255,6 +255,10 @@ If that is not set, then the system default will be used.
return self.lineProcessor.frontMatterAttributes
}
}

public var imageScale : CGFloat = 1

public var containImageWidth : Bool = false

var currentType : MarkdownLineStyle = .body

Expand Down Expand Up @@ -441,6 +445,27 @@ If that is not set, then the system default will be used.

}

class ImageAttachment: NSTextAttachment {

private var imageScale: CGFloat = 1.0
private var containImageWidth: Bool = false

convenience init(imageScale: CGFloat, containImageWidth: Bool) {
self.init()
self.imageScale = imageScale
self.containImageWidth = containImageWidth
}

override func attachmentBounds(for textContainer: NSTextContainer?, proposedLineFragment lineFrag: CGRect, glyphPosition position: CGPoint, characterIndex charIndex: Int) -> CGRect {
guard let imageSize = image?.size else {
return super.attachmentBounds(for: textContainer, proposedLineFragment: lineFrag, glyphPosition: position, characterIndex: charIndex)
}
let scale: CGFloat = containImageWidth ? min(imageScale, lineFrag.width / imageSize.width) : imageScale

return CGRect(x: 0, y: 0, width: imageSize.width * scale, height: imageSize.height * scale)
}
}

extension SwiftyMarkdown {

func attributedStringFor( tokens : [Token], in line : SwiftyLine ) -> NSAttributedString {
Expand Down Expand Up @@ -592,12 +617,12 @@ extension SwiftyMarkdown {
continue
}
#if !os(macOS)
let image1Attachment = NSTextAttachment()
let image1Attachment = ImageAttachment(imageScale: imageScale, containImageWidth: containImageWidth)
image1Attachment.image = UIImage(named: token.metadataStrings[imgIdx])
let str = NSAttributedString(attachment: image1Attachment)
finalAttributedString.append(str)
#elseif !os(watchOS)
let image1Attachment = NSTextAttachment()
let image1Attachment = ImageAttachment(imageScale: imageScale, containImageWidth: containImageWidth)
image1Attachment.image = NSImage(named: token.metadataStrings[imgIdx])
let str = NSAttributedString(attachment: image1Attachment)
finalAttributedString.append(str)
Expand Down