Some layout.swift changes. Added support for the metrics parameter and a fitting size calculation function; this will be needed for the next experiment with boxes.

redo/osxaltest/box.swift

@@ -90,8 +90,6 @@ class Box : NSView, Control {
 		self.parent = p
 	}
 
-	// TODO stretchiness
-	// - we will need a trailing view if there are no stretchy controls
 	private func relayout() {
 		var constraint: String
 
@@ -144,19 +142,19 @@ class Box : NSView, Control {
 			constraint += "[noStretchyView]"
 		}
 		constraint += "|"
-		var constraints = mkconstraints(constraint, views)
+		var constraints = mkconstraints(constraint, nil, views)
 		self.addConstraints(constraints)
 
 		// next: assemble the views in the secondary direction
 		// each of them will span the secondary direction
 		for i in 0..<n {
 			constraint = "\(self.secondaryDirPrefix)|[view\(i)]|"
-			var constraints = mkconstraints(constraint, views)
+			var constraints = mkconstraints(constraint, nil, views)
 			self.addConstraints(constraints)
 		}
 		if firstStretchy == -1 {		// and again to the no-stretchy view
 			constraint = "\(self.secondaryDirPrefix)|[noStretchyView]|"
-			var constraints = mkconstraints(constraint, views)
+			var constraints = mkconstraints(constraint, nil, views)
 			self.addConstraints(constraints)
 		}
 	}

redo/osxaltest/layout.swift

@@ -1,11 +1,11 @@
 // 8 august 2015
 import Cocoa
 
-func mkconstraints(constraint: String, views: [String: NSView]) -> [AnyObject] {
+func mkconstraints(constraint: String, metrics: [String: Double]?, views: [String: NSView]) -> [AnyObject] {
 	return NSLayoutConstraint.constraintsWithVisualFormat(
 		constraint,
 		options: NSLayoutFormatOptions(0),
-		metrics: nil,
+		metrics: metrics,
 		views: views)
 }
 
@@ -38,3 +38,11 @@ func setHorzHuggingPri(view: NSView, priority: NSLayoutPriority) {
 func setVertHuggingPri(view: NSView, priority: NSLayoutPriority) {
 	setHuggingPri(view, priority, NSLayoutConstraintOrientation.Vertical)
 }
+
+func fittingAlignmentSize(view: NSView) -> NSSize {
+	var s = view.fittingSize
+	// the fitting size is for a frame rect; we need an alignment rect
+	var r = NSMakeRect(0, 0, s.width, s.height)
+	r = view.alignmentRectForFrame(r)
+	return r.size
+}

redo/osxaltest/spinbox.swift

@@ -50,11 +50,11 @@ nspinbox++
 			"t":	self.t,
 			"s":	self.s,
 		]
-		var constraints = mkconstraints("H:|[t]-[s]|", views)
+		var constraints = mkconstraints("H:|[t]-[s]|", nil, views)
 		self.addConstraints(constraints)
-		constraints = mkconstraints("V:|[t]|", views)
+		constraints = mkconstraints("V:|[t]|", nil, views)
 		self.addConstraints(constraints)
-		constraints = mkconstraints("V:|[s]|", views)
+		constraints = mkconstraints("V:|[s]|", nil, views)
 		self.addConstraints(constraints)
 	}
 

redo/osxaltest/window.swift

@@ -76,11 +76,11 @@ class Window : NSWindow, Control {
 		}
 
 		var constraint = "H:|" + margin + "[view]" + margin + "|"
-		var constraints = mkconstraints(constraint, views)
+		var constraints = mkconstraints(constraint, nil, views)
 		contentView.addConstraints(constraints)
 
 		constraint = "V:|" + margin + "[view]" + margin + "|"
-		constraints = mkconstraints(constraint, views)
+		constraints = mkconstraints(constraint, nil, views)
 		contentView.addConstraints(constraints)
 	}
 }