Decided to rewrite this test program in Swift. Started with main.m, osxaltest.h, and util.m.

redo/osxaltest/control.swift

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+// 31 july 2015
+import Cocoa
+
+typedef struct tAutoLayoutParams tAutoLayoutParams;
+
+// TODO stretchy across both dimensions
+// for a vertical box, the horizontal width should be variable
+class tAutoLayoutParams {
+	var view: NSView
+	var attachLeft: Bool
+	var attachTop: Bool
+	var attachRight: Bool
+	var attachBottom: Bool
+	var nonStretchyWidthPredicate: String
+	var nonStretchyHeightPredicate: String
+}
+
+protocol tControl {
+	mutating func tSetParent(p: tControl, addToView: NSView, relayout: Bool)
+	mutating func tFillAutoLayout(p: tAutoLayoutParams)
+	mutating func tRelayout()
+}
+
+func tAutoLayoutKey(n: UInt) -> String {
+	return NSString(format: "view%d", n)
+}

redo/osxaltest/main.swift

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+// 31 july 2015
+import Cocoa
+
+var spaced = false
+var firstvert = false
+
+func appLaunched() {
+	var hbox: tBox
+	var spinbox: tSpinbox
+	var button: tButton
+	var entry: tEntry
+	var label: tLabel
+
+	var mainwin = tWindow()
+	mainwin.tSetMargined(spaced)
+
+	var box = tBox(vertical: firstvert, spaced: spaced)
+
+	spinbox = tSpinbox()
+	box.tAddControl(spinbox, stretchy: false)
+
+	mainwin.tSetControl(box)
+
+	hbox = tBox(vertical: !firstvert, spaced: spaced)
+	button = tButton("Button")
+	hbox.tAddControl(button, stretchy: true)
+	button = tButton("Button")
+	hbox.tAddControl(button, stretchy: true)
+	box.tAddControl(hbox, stretchy: false)
+
+	hbox = tBox(vertical: !firstvert, spaced: spaced)
+	button = tButton("Button")
+	hbox.tAddControl(button, stretchy: true)
+	button = tButton("Button")
+	hbox.tAddControl(button, stretchy: true)
+	box.tAddControl(hbox, stretchy: false)
+
+	// TODO in vertical mode the three non-stretchy buttons are smaller than they should be
+	hbox = tBox(vertical: !firstvert, spaced: spaced)
+	button = tButton("Button")
+	hbox.tAddControl(button, stretchy: true)
+	button = tButton("A")
+	hbox.tAddControl(button, stretchy: false)
+	button = tButton("BB")
+	hbox.tAddControl(button, stretchy: false)
+	button = tButton("CCC")
+	hbox.tAddControl(button, stretchy: false)
+	box.tAddControl(hbox, stretchy: false)
+
+	// TODO this isn't stretchy in the proper order
+	hbox = tBox(vertical: !firstvert, spaced: spaced)
+	spinbox = tSpinbox()
+	hbox.tAddControl(spinbox, stretchy: false)
+	spinbox = tSpinbox()
+	hbox.tAddControl(spinbox, stretchy: true)
+	box.tAddControl(hbox, stretchy: false)
+
+	hbox = tBox(vertical: !firstvert, spaced: spaced)
+	entry = tEntry()
+	hbox.tAddControl(entry, stretchy: false)
+	entry = tEntry()
+	hbox.tAddControl(entry, stretchy: true)
+	box.tAddControl(hbox, stretchy: false)
+
+	hbox = tBox(vertical: !firstvert, spaced: spaced)
+	label = tLabel()
+	hbox.tAddControl(label, stretchy: false)
+	box.tAddControl(hbox, stretchy: false)
+
+	mainwin.tShow()
+}
+
+class appDelegate : NSApplicationDelegate {
+	func applicationDidFinishLaunching(note: NSNotification) {
+		appLaunched()
+	}
+
+	func applicationShouldTerminateAfterLastWindowClosed(app: NSApplication) -> Bool {
+		return true
+	}
+}
+
+func main() {
+	spaced = Process.arguments.count > 1
+
+	var app = NSApplication.sharedApplication()
+	app.setActivationPolicy(NSApplicationActivationPolicyRegular)
+	app.setDelegate(appDelegate())
+	app.run()
+}
+
+main()