move files around

Sources/phbar/Models/PHTheme/PHThemeWindow/PHThemeWindowAnchor.swift

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+import CoreGraphics
+import Foundation
+
+/// Where a window is placed within its screen.
+///
+/// Single-edge anchors (`top`, `bottom`, `leading`, `trailing`) pin to that
+/// edge and center along the opposite axis. Corner anchors pin to two edges.
+/// `center` centers the window on both axes.
+enum PHThemeWindowAnchor: String, Decodable {
+	case top, bottom, leading, trailing
+	case topLeading = "top-leading"
+	case topTrailing = "top-trailing"
+	case bottomLeading = "bottom-leading"
+	case bottomTrailing = "bottom-trailing"
+	case center
+}
+
+extension PHThemeWindowAnchor {
+	/// Compute the top-left origin (in screen coordinates) of a window of `size`
+	/// placed against this anchor within `screen`, offset by `margin` along the
+	/// anchored edges.
+	///
+	/// Edges the anchor does not reference are ignored, so margins only affect
+	/// the relevant sides.
+	func origin(in screen: CGRect, size: CGSize, margin: PHThemeWindowMargin) -> CGPoint {
+		let top = margin.top ?? 0
+		let bottom = margin.bottom ?? 0
+		let leading = margin.leading ?? 0
+		let trailing = margin.trailing ?? 0
+
+		// Default: centered on both axes.
+		var point = CGPoint(
+			x: screen.midX - size.width / 2,
+			y: screen.midY - size.height / 2
+		)
+
+		switch self {
+		case .top:
+			point.y = screen.maxY - CGFloat(top) - size.height
+		case .bottom:
+			point.y = screen.minY + CGFloat(bottom)
+		case .leading:
+			point.x = screen.minX + CGFloat(leading)
+		case .trailing:
+			point.x = screen.maxX - CGFloat(trailing) - size.width
+		case .topLeading:
+			point.x = screen.minX + CGFloat(leading)
+			point.y = screen.maxY - CGFloat(top) - size.height
+		case .topTrailing:
+			point.x = screen.maxX - CGFloat(trailing) - size.width
+			point.y = screen.maxY - CGFloat(top) - size.height
+		case .bottomLeading:
+			point.x = screen.minX + CGFloat(leading)
+			point.y = screen.minY + CGFloat(bottom)
+		case .bottomTrailing:
+			point.x = screen.maxX - CGFloat(trailing) - size.width
+			point.y = screen.minY + CGFloat(bottom)
+		case .center:
+			break
+		}
+
+		return point
+	}
+}