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Factored out Rendering logic to setup for Client, Server transport.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| /// This type is responsible for output to the display of the current setup. | ||
| protocol Renderer { | ||
| /// This will be called per frame so keep the work between initialization | ||
| /// and render light. | ||
| init(_ graph: VisibleNode) | ||
| /// Outputs the actual image to the display. | ||
| func render(_ x: Int, _ y: Int) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| struct TerminalRenderer: Renderer { | ||
| let graph: VisibleNode | ||
|
|
||
| init(_ graph: VisibleNode) { | ||
| self.graph = graph | ||
| } | ||
|
|
||
| func render(_ x: Int, _ y: Int) { | ||
| let ascii = self.graph.drawVisible(x, y).0 | ||
| ChromaFrame(ascii, .default, .default).render() | ||
| } | ||
| } | ||
|
|
||
| struct Consumed: Equatable { | ||
| let x: Int | ||
| let y: Int | ||
| } | ||
|
|
||
| extension VisibleNode { | ||
| /// Draw / render the VisibleNode consuming the max width and height given. | ||
| func drawVisible(_ width: Int, _ height: Int) -> (ANSIString, Consumed) { | ||
| switch self { | ||
| case let .entry(s): | ||
| return (s, Consumed(x: s.count, y: 1)) | ||
| case let .button(l): | ||
| return (l, Consumed(x: l.count, y: 1)) | ||
| case let .text(t): | ||
| return (t, Consumed(x: t.count, y: 1)) | ||
| case let .group(orientation, children): | ||
| var xt = 0 | ||
| var yt = 0 | ||
| var out = "" | ||
| for child in children { | ||
| // TODO check if we can add | ||
| switch orientation { | ||
| /* | ||
| Hmm we need to add all the widths together then consume the renaming space? | ||
| */ | ||
| case .horizontal: | ||
| let (s, c) = child.drawVisible(width - xt, height) | ||
| yt = c.y | ||
| xt += c.x | ||
| out += s | ||
| case .vertical: | ||
| let (s, c) = child.drawVisible(width, height - yt) | ||
| yt += c.y | ||
| xt = c.x | ||
| out += s | ||
| } | ||
| } | ||
| switch orientation { | ||
| case .horizontal: | ||
| return consumeWidth( | ||
| out, needed: xt, available: width, height: yt) | ||
| case .vertical: | ||
| return consumeHeight( | ||
| out, needed: yt, available: height, width: xt) | ||
| } | ||
| case let .selected(child): // Apply Style? | ||
| let (s, c) = child.drawVisible(width, height) | ||
| return (_wrap(s, .black, .pink), c) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// Consumes the given height | ||
| private func consumeHeight( | ||
| _ text: String, needed: Int, available height: Int, width: Int | ||
| ) -> (ANSIString, Consumed) { | ||
| let half = (height - needed) / 2 | ||
| let spacer = Array(repeating: " ", count: width).joined() | ||
| let spacing = Array(repeating: spacer, count: half) | ||
| let top = spacing | ||
| var bump = "" | ||
| let bottom = spacing | ||
| var yt = top.count + bump.count + needed + bottom.count | ||
| if yt != width { | ||
| yt += 1 | ||
| bump += spacer | ||
| } | ||
| let out = | ||
| top.joined(separator: "") + bump + text | ||
| + bottom.joined(separator: "") | ||
| return (out, Consumed(x: width, y: yt)) | ||
| } | ||
|
|
||
| /// Consumes the given width | ||
| private func consumeWidth( | ||
| _ text: String, needed: Int, available width: Int, height: Int | ||
| ) | ||
| -> (ANSIString, Consumed) | ||
| { | ||
| /* | ||
| BUG This only wraps one row not multiple. Maybe I need some notion of Row. | ||
| */ | ||
| let half = (width - needed) / 2 | ||
| let spacing = Array(repeating: " ", count: half).joined() | ||
| let left = spacing | ||
| var bump = "" | ||
| let right = spacing | ||
| var xt = left.count + bump.count + needed + right.count | ||
| if xt != width { | ||
| xt += 1 | ||
| bump += " " | ||
| } | ||
| let out = left + bump + text + right | ||
| return (out, Consumed(x: xt, y: height)) | ||
| } |
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