Gemini/GeminiRenderer/RenderingBlockView.swift

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Swift
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//
// RenderingBlockView.swift
// GeminiRenderer
//
// Created by Shadowfacts on 7/13/20.
//
import SwiftUI
import GeminiFormat
struct RenderingBlockView: View {
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let document: Document
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let block: RenderingBlock
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let changeURL: ((URL) -> Void)?
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@State var hovering = false
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init(document: Document, block: RenderingBlock, changeURL: ((URL) -> Void)? = nil) {
self.document = document
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self.block = block
self.changeURL = changeURL
}
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@ViewBuilder
var body: some View {
switch block {
case let .text(text):
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self.text(text)
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case let .link(url, text: linkText):
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self.link(url, text: linkText)
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case let .preformatted(text, alt: _):
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preformatted(text)
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case let .heading(text, level: level):
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heading(text, level: level)
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case let .unorderedListItem(text):
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unorderedListItem(text)
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case let .quote(text):
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quote(text)
}
}
private func text(_ text: String) -> some View {
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Text(verbatim: text)
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.font(.documentBody)
.frame(maxWidth: .infinity, alignment: .leading)
}
private func link(_ url: URL, text: String?) -> some View {
let text = text ?? url.absoluteString
#if os(macOS)
let buttonStyle = LinkButtonStyle()
#elseif os(iOS)
let buttonStyle = PlainButtonStyle()
#endif
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let imageName: String
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if url.scheme == "gemini" {
if url.host == document.url.host {
imageName = "arrow.right"
} else {
imageName = "link"
}
} else if url.scheme == "http" || url.scheme == "https" {
imageName = "safari"
} else if url.scheme == "mailto" {
imageName = "envelope"
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} else {
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imageName = "arrow.up.left.square"
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}
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let button: some View = Button {
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self.changeURL?(url)
} label: {
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HStack(alignment: .firstTextBaseline, spacing: 4) {
Image(systemName: imageName)
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.frame(minWidth: 23, alignment: .leading)
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Text(verbatim: text)
.font(.documentBody)
.foregroundColor(hovering ? .blue : Color.blue.opacity(0.8))
.underline()
.frame(maxWidth: .infinity, alignment: .leading)
}
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}
.buttonStyle(buttonStyle)
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.onHover { hovering in
self.hovering = hovering
}
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return button.maybeHelp(url.absoluteString)
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}
private func preformatted(_ text: String) -> some View {
ScrollView(.horizontal) {
Text(verbatim: text)
.font(.documentBodyPreformatted)
.frame(maxWidth: .infinity, alignment: .leading)
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}
}
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private func heading(_ text: String, level: Document.HeadingLevel) -> some View {
Text(verbatim: text)
.font(level.font)
.frame(maxWidth: .infinity, alignment: .leading)
}
private func unorderedListItem(_ text: String) -> some View {
// todo: should this be .firstTextBaseline?
HStack(alignment: .top, spacing: 4) {
Text(verbatim: "\u{2022}")
Text(verbatim: text)
.font(.documentBody)
Spacer()
}.frame(maxWidth: .infinity, alignment: .leading)
}
private func quote(_ text: String) -> some View {
HStack(spacing: 4) {
Color.gray
.frame(width: 4)
Text(verbatim: text)
.font(Font.documentBody.italic())
.foregroundColor(.gray)
Spacer()
}.frame(maxWidth: .infinity, alignment: .leading)
}
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}
struct RenderingBlockView_Previews: PreviewProvider {
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static let doc = Document(url: URL(string: "gemini://localhost/test.gmi")!, lines: [.text("Some Text"), .quote("A Quote")])
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static var previews: some View {
Group {
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RenderingBlockView(document: doc, block: .text("Some Text"))
RenderingBlockView(document: doc, block: .quote("A Quote"))
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}
}
}