More Box work.

redo/osxaltest/box.swift

@@ -9,17 +9,33 @@ struct BoxControl {
 class Box : NSView, Control {
 	private var controls: [BoxControl]
 	private var parent: Control?
+	private var vertical: Bool
 	private var padded: Bool
 
-	init(_ padded: Bool) {
+	private var primaryDirPrefix: String
+	private var secondaryDirPrefix: String
+
+	init(vertical: Bool, padded: Bool) {
 		self.controls = []
 		self.parent = nil
+		self.vertical = vertical
 		self.padded = padded
 
+		self.primaryDirPrefix = "H:"
+		self.secondaryDirPrefix = "V:"
+		if self.vertical {
+			self.primaryDirPrefix = "V:"
+			self.secondaryDirPrefix = "H:"
+		}
+
 		super.init(frame: NSZeroRect)
 		self.translatesAutoresizingMaskIntoConstraints = false
 	}
 
+	required init?(coder: NSCoder) {
+		fatalError("can't use this constructor, sorry")
+	}
+
 	func Add(control: Control, stretchy: Stretchy) {
 		var c BoxControl
 
@@ -27,7 +43,7 @@ class Box : NSView, Control {
 		c.stretchy = stretchy
 		self.addSubview(c.c.View())
 		self.controls.append(c)
-		// TODO relayout
+		self.relayout()
 	}
 
 	func View() -> NSView {
@@ -37,4 +53,27 @@ class Box : NSView, Control {
 	func SetParent(p: Control) {
 		self.parent = p
 	}
+
+	// TODO stretchiness
+	// - we will need a trailing view if there are no stretchy controls
+	private func relayout() {
+		if self.children.count == 0 {
+			return
+		}
+
+		self.removeConstraints(self.constraints)
+
+		// first collect the views
+		var views = [String: NSView]()
+		var n = 0
+		for c in self.controls {
+			views["view\(n)"] = c.c.View()
+		}
+
+		// next, assemble the views in the primary direction
+		// they all go in a straight line
+
+		// next: assemble the views in the secondary direction
+		// each of them will span the secondary direction
+	}
 }