Added experimental code that tried, and failed, to combat combobox autoselection on Mac OS X.

experiments/combobox_darwin.m

@@ -0,0 +1,156 @@
+// 17 may 2014
+
+#include "objc_darwin.h"
+#include <AppKit/NSPopUpButton.h>
+#include <AppKit/NSComboBox.h>
+#include <AppKit/NSArrayController.h>
+
+/*
+Cocoa doesn't have combo boxes in the sense that other systems do. NSPopUpButton is not editable and technically behaves like a menu on a menubar. NSComboBox is editable and is the more traditional combo box, but the edit field and list are even more separated than they are on other platforms.
+
+Unfortunately, their default internal storage mechanisms exhibit the automatic selection behavior I DON'T want, so we're going to have to do that ourselves.
+
+You will notice that a bunch of functions here call functions in listbox_darwin.m. How convenient =P
+*/
+
+@interface combobox : NSObject {
+@public
+	NSPopUpButton *pb;
+	NSComboBox *cb;
+	NSArrayController *ac;
+}
+// and these are so we can use a combobox like a reegular control
+- (void)setHidden:(BOOL)hidden;
+- (void)setFont:(NSFont *)font;
+- (void)setFrame:(NSRect)r;
+- (NSRect)frame;
+- (void)sizeToFit;
+@end
+
+@implementation combobox
+
+#define OVERRIDE(sig, msg) \
+	sig \
+	{ \
+		if (pb != nil) { \
+			[pb msg]; \
+			return; \
+		} \
+		[cb msg]; \
+	}
+
+OVERRIDE(- (void)setHidden:(BOOL)hidden, setHidden:hidden)
+OVERRIDE(- (void)setFont:(NSFont *)font, setFont:font)
+OVERRIDE(- (void)setFrame:(NSRect)r, setFrame:r)
+
+- (NSRect)frame
+{
+	if (pb != nil)
+		return [pb frame];
+	return [cb frame];
+}
+
+OVERRIDE(- (void)sizeToFit, sizeToFit)
+
+@end
+
+extern NSRect dummyRect;
+
+#define to(T, x) ((T *) (x))
+#define tocombobox(x) to(combobox, (x))
+
+#define toNSInteger(x) ((NSInteger) (x))
+#define fromNSInteger(x) ((intptr_t) (x))
+
+#define COMBOBOXKEY @"cbitem"
+static NSString *comboboxKey = COMBOBOXKEY;
+static NSString *comboboxKeyPath = @"arrangedObjects." COMBOBOXKEY;
+
+id makeCombobox(BOOL editable)
+{
+	combobox *c;
+
+	c = [combobox new];
+	c->pb = nil;
+	c->cb = nil;
+	c->ac = makeListboxArray();
+#define BIND bind:@"contentValues" toObject:c->ac withKeyPath:comboboxKeyPath options:nil
+	if (!editable) {
+		c->pb = [[NSPopUpButton alloc]
+			initWithFrame:dummyRect
+			pullsDown:NO];
+		[c->pb BIND];
+	} else {
+		c->cb = [[NSComboBox alloc]
+			initWithFrame:dummyRect];
+		[c->cb setUsesDataSource:NO];
+		[c->cb BIND];
+	}
+	return c;
+}
+
+void addCombobox(id parentWindow, id cbox)
+{
+	combobox *c;
+
+	c = tocombobox(cbox);
+	if (c->pb != nil) {
+		addControl(parentWindow, c->pb);
+		return;
+	}
+	addControl(parentWindow, c->cb);
+}
+
+id comboboxText(id cbox, BOOL editable)
+{
+	combobox *c;
+
+	c = tocombobox(cbox);
+	if (!editable)
+		return [c->pb titleOfSelectedItem];
+	return [c->cb stringValue];
+}
+
+void comboboxAppend(id cbox, BOOL editable, id str)
+{
+	combobox *c;
+
+	c = tocombobox(cbox);
+	listboxArrayAppend(c->ac, toListboxItem(comboboxKey, str));
+}
+
+void comboboxInsertBefore(id cbox, BOOL editable, id str, intptr_t before)
+{
+	combobox *c;
+
+	c = tocombobox(cbox);
+	listboxArrayInsertBefore(c->ac, toListboxItem(comboboxKey, str), before);
+}
+
+intptr_t comboboxSelectedIndex(id cbox)
+{
+	combobox *c;
+
+	c = tocombobox(cbox);
+	if (c->pb != nil)
+		return fromNSInteger([c->pb indexOfSelectedItem]);
+	return fromNSInteger([c->cb indexOfSelectedItem]);
+}
+
+void comboboxDelete(id cbox, intptr_t index)
+{
+	combobox *c;
+
+	c = tocombobox(cbox);
+	listboxArrayDelete(c->ac, index);
+}
+
+intptr_t comboboxLen(id cbox)
+{
+	combobox *c;
+
+	c = tocombobox(cbox);
+	if (c->pb != nil)
+		return fromNSInteger([c->pb numberOfItems]);
+	return fromNSInteger([c->cb numberOfItems]);
+}