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Add canvas environment #6

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Add canvas environment #6

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40 changes: 39 additions & 1 deletion Sources/SwiftUIcon/Icon+PreviewHelpers.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,8 @@ public struct IconStack<IconContent>: View where IconContent: View {
public var body: some View {
return GeometryReader { proxy in
ZStack(alignment: .center) {
self.content(CanvasProxy(proxy: proxy, expected: CGSize(width: Constants.stackDimension, height: Constants.stackDimension)))
let canvas = CanvasProxy(proxy: proxy, expected: CGSize(width: Constants.stackDimension, height: Constants.stackDimension))
self.content(canvas).environment(\.canvas, canvas)
}
.frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity, alignment: .top)
}
Expand Down Expand Up @@ -177,3 +178,40 @@ extension View {
.padding(50)
}
}

// MARK: - Canvas environment

private struct CanvasKey: EnvironmentKey {
static var defaultValue: CanvasProtocol = EmptyCanvasProxy()
}

@available(iOS 13.0, OSX 10.15, tvOS 13.0, watchOS 6.0, *)
extension EnvironmentValues {

/// Returns canvas related to the current icon.
///
/// If accessed from a view that is outside of ``IconStack`` hierarchy, will give canvas that returns original values.
@available(iOS 13.0, OSX 10.15, tvOS 13.0, watchOS 6.0, *)
public internal(set) var canvas: CanvasProtocol {
get { self[CanvasKey.self] }
set { self[CanvasKey.self] = newValue }
}
}

// MARK: Canvas protocol

public protocol CanvasProtocol {
var scale: CGFloat { get }
subscript(_ points: CGFloat) -> CGFloat { get }
}

@available(iOS 13.0, OSX 10.15, tvOS 13.0, watchOS 6.0, *)
extension CanvasProxy: CanvasProtocol {}

private struct EmptyCanvasProxy: CanvasProtocol {
var scale: CGFloat { 1 }

subscript(points: CGFloat) -> CGFloat {
points
}
}