Began migrating all the Mac OS X sizing stuff over.

redo/objc_darwin.h

@@ -65,4 +65,23 @@ extern void tableMakeDataSource(id, void *);
 /* control_darwin.m */
 extern id newScrollView(id);
 
+/* xsizing_darwin.m */
+struct xsize {
+	intptr_t width;
+	intptr_t height;
+};
+struct xrect {
+	intptr_t x;
+	intptr_t y;
+	intptr_t width;
+	intptr_t height;
+};
+struct xalignment {
+	struct xrect rect;
+	intptr_t baseline;
+};
+extern struct xsize controlPrefSize(id);
+extern struct xsize areaPrefSize(id);
+extern struct xalignment alignmentInfo(id, struct xrect);
+
 #endif

redo/xsizing_darwin.m

@@ -0,0 +1,63 @@
+// 15 may 2014
+
+#include "objc_darwin.h"
+#import <Cocoa/Cocoa.h>
+
+#define toNSControl(x) ((NSControl *) (x))
+#define toNSScrollView(x) ((NSScrollView *) (x))
+#define toNSView(x) ((NSView *) (x))
+
+// TODO merge into control_darwin.m or sizing_darwin.m? really need to figure out what to do about the Go-side container struct...
+
+// also good for NSTableView (TODO might not do what we want) and NSProgressIndicator
+struct xsize controlPrefSize(id control)
+{
+	NSControl *c;
+	NSRect r;
+	struct xsize s;
+
+	c = toNSControl(control);
+	[c sizeToFit];
+	r = [c frame];
+	s.width = (intptr_t) r.size.width;
+	s.height = (intptr_t) r.size.height;
+	return s;
+}
+
+// TODO use this, possibly update to not need scrollview
+/*
+struct xsize areaPrefSize(id scrollview)
+{
+	NSView *c;
+	NSRect r;
+	struct xsize s;
+
+	c = areaInScrollView(toNSScrollView(scrollview));
+	// don't size to fit; the frame size is already the size we want
+	r = [c frame];
+	s.width = (intptr_t) r.size.width;
+	s.height = (intptr_t) r.size.height;
+	return s;
+}
+*/
+
+struct xalignment alignmentInfo(id c, struct xrect newrect)
+{
+	NSView *v;
+	struct xalignment a;
+	NSRect r;
+
+	v = toNSView(c);
+	r = NSMakeRect((CGFloat) newrect.x,
+		(CGFloat) newrect.y,
+		(CGFloat) newrect.width,
+		(CGFloat) newrect.height);
+	r = [v alignmentRectForFrame:r];
+	a.rect.x = (intptr_t) r.origin.x;
+	a.rect.y = (intptr_t) r.origin.y;
+	a.rect.width = (intptr_t) r.size.width;
+	a.rect.height = (intptr_t) r.size.height;
+	// TODO set frame first?
+	a.baseline = (intptr_t) [v baselineOffsetFromBottom];
+	return a;
+}