Resolved that TODO.

redo/osxaltest/box.m

@@ -76,8 +76,15 @@
 	pp.vertAttachBottom = subvertbottom;
 	pp.views = p->views;
 	pp.n = p->n;
-	pp.stretchyVert = self->vertical;
-	pp.firstStretchy = TRUE;
+	if (self->vertical) {
+		pp.vertFirstStretchy = YES;
+		pp.horzStretchy = YES;
+		pp.horzFirstStretchy = YES;
+	} else {
+		pp.horzFirstStretchy = YES;
+		pp.vertStretchy = YES;
+		pp.vertFirstStretchy = YES;
+	}
 	for (i = 0; i < [self->children count]; i++) {
 		id<tControl> cur;
 		NSNumber *isStretchy;
@@ -85,22 +92,30 @@
 		first[i] = pp.n;
 		cur = (id<tControl>) [self->children objectAtIndex:i];
 		isStretchy = (NSNumber *) [self->stretchy objectAtIndex:i];
-		pp.stretchy = [isStretchy boolValue];
 		if (self->vertical) {
+			pp.vertStretchy = [isStretchy boolValue];
 			pp.vertFirst = p->vertFirst && i == 0;
 			pp.vertLast = p->vertLast && i == ([self->children count] - 1);
 			pp.horzFirst = p->horzFirst;
 			pp.horzLast = p->horzLast;
 		} else {
+			pp.horzStretchy = [isStretchy boolValue];
 			pp.horzFirst = p->horzFirst && i == 0;
 			pp.horzLast = p->horzLast && i == ([self->children count] - 1);
 			pp.vertFirst = p->vertFirst;
 			pp.vertLast = p->vertLast;
 		}
 		[cur tFillAutoLayout:&pp];
-		if (pp.stretchy && pp.firstStretchy) {
-			pp.firstStretchy = FALSE;
-			pp.stretchyTo = first[i];
+		if (self->vertical) {
+			if (pp.vertStretchy && pp.vertFirstStretchy) {
+				pp.vertFirstStretchy = NO;
+				pp.vertStretchyTo = first[i];
+			}
+		} else {
+			if (pp.horzStretchy && pp.horzFirstStretchy) {
+				pp.horzFirstStretchy = NO;
+				pp.horzStretchyTo = first[i];
+			}
 		}
 	}
 	p->n = pp.n;
@@ -146,6 +161,7 @@
 // TODOs:
 // - lateral dimension: for each view of n+1, make other dimension next to first n
 // 	this way, subelement views get positioned right
+// - don't pin to end if no controls are stretchy
 
 - (void)tRelayout
 {

redo/osxaltest/button.m

@@ -39,20 +39,19 @@
 	key = tAutoLayoutKey(p->n);
 	p->n++;
 	horzpred = @"";
-	vertpred = @"";
-	if (p->stretchy) {
-		NSString *predicate;
-
-		if (p->firstStretchy)
+	if (p->horzStretchy)
+		if (p->horzFirstStretchy)
 			// TODO is this unnecessary? it seems like I need to do other things instead of this to ensure stretchiness...
-			predicate = @"(>=0)";
+			horzpred = @"(>=0)";
 		else
-			predicate = [NSString stringWithFormat:@"(==%@)", tAutoLayoutKey(p->stretchyTo)];
-		if (p->stretchyVert)
-			vertpred = predicate;
+			horzpred = [NSString stringWithFormat:@"(==%@)", tAutoLayoutKey(p->horzStretchyTo)];
+	vertpred = @"";
+	if (p->vertStretchy)
+		if (p->vertFirstStretchy)
+			// TODO is this unnecessary? it seems like I need to do other things instead of this to ensure stretchiness...
+			vertpred = @"(>=0)";
 		else
-			horzpred = predicate;
-	}
+			vertpred = [NSString stringWithFormat:@"(==%@)", tAutoLayoutKey(p->vertStretchyTo)];
 	[p->horz addObject:[NSString stringWithFormat:@"[%@%@]", key, horzpred]];
 	[p->horzAttachLeft addObject:[NSNumber numberWithBool:p->horzFirst]];
 	[p->horzAttachRight addObject:[NSNumber numberWithBool:p->horzLast]];

redo/osxaltest/osxaltest.h

@@ -19,10 +19,12 @@ struct tAutoLayoutParams {
 	BOOL vertLast;
 	NSMutableDictionary *views;
 	uintmax_t n;
-	BOOL stretchy;
-	BOOL stretchyVert;
-	BOOL firstStretchy;
-	uintmax_t stretchyTo;
+	BOOL horzStretchy;
+	BOOL horzFirstStretchy;
+	uintmax_t horzStretchyTo;
+	BOOL vertStretchy;
+	BOOL vertFirstStretchy;
+	uintmax_t vertStretchyTo;
 };
 
 @protocol tControl

redo/osxaltest/spinbox.m

@@ -83,19 +83,19 @@
 	key = tAutoLayoutKey(p->n);
 	p->n++;
 	horzpred = @"(==96)";		// TODO only the entry
+	if (p->horzStretchy)
+		if (p->horzFirstStretchy)
+			// TODO is this unnecessary? it seems like I need to do other things instead of this to ensure stretchiness...
+			horzpred = @"(>=0)";
+		else
+			horzpred = [NSString stringWithFormat:@"(==%@)", tAutoLayoutKey(p->horzStretchyTo)];
 	vertpred = @"";
-	if (p->stretchy) {
-		NSString *predicate;
-
-		if (p->firstStretchy)
-			predicate = @"(>=0)";
+	if (p->vertStretchy)
+		if (p->vertFirstStretchy)
+			// TODO is this unnecessary? it seems like I need to do other things instead of this to ensure stretchiness...
+			vertpred = @"(>=0)";
 		else
-			predicate = [NSString stringWithFormat:@"(==%@)", tAutoLayoutKey(p->stretchyTo)];
-		if (p->stretchyVert)
-			vertpred = predicate;
-		else
-			horzpred = predicate;
-	}
+			vertpred = [NSString stringWithFormat:@"(==%@)", tAutoLayoutKey(p->vertStretchyTo)];
 	[p->horz addObject:[NSString stringWithFormat:@"[%@%@]", key, horzpred]];
 	[p->horzAttachLeft addObject:[NSNumber numberWithBool:p->horzFirst]];
 	[p->horzAttachRight addObject:[NSNumber numberWithBool:p->horzLast]];

redo/osxaltest/window.m

@@ -64,6 +64,10 @@
 	p.vertLast = YES;
 	p.views = [NSMutableDictionary new];
 	p.n = 0;
+	p.horzStretchy = YES;		// assumption for the sole control to avoid fixed size hacks
+	p.horzFirstStretchy = YES;
+	p.vertStretchy = YES;
+	p.vertFirstStretchy = YES;
 	[self->c tFillAutoLayout:&p];
 
 	margin = @"";