Initial OGComboBox implementation.

Only support for text so far.

gtk/OGComboBox.m

@@ -0,0 +1,78 @@
+#import "OGComboBox.h"
+
+@interface OGComboBox ()
+- (void)OG_changed;
+@end
+
+static void
+changed(GtkWidget *widget, gpointer data)
+{
+	[(OGComboBox*)data OG_changed];
+}
+
+@implementation OGComboBox
+@synthesize delegate;
+
++ comboBox
+{
+	return [[[self alloc] init] autorelease];
+}
+
+- init
+{
+	self = [super init];
+
+	widget = gtk_combo_box_new();
+	GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
+	gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(widget), renderer, FALSE);
+	gtk_cell_layout_set_attributes(GTK_CELL_LAYOUT(widget), renderer,
+	    "text", 0, NULL);
+	g_signal_connect(G_OBJECT(widget), "changed", G_CALLBACK(changed),
+	    self);
+
+	g_signal_connect(G_OBJECT(widget), "destroy", G_CALLBACK(og_destroy),
+	    self);
+	[self retain];
+
+	return self;
+}
+
+- (id <OGComboBoxDataSource>)dataSource
+{
+	return dataSource;
+}
+
+- (void)setDataSource: (id <OGComboBoxDataSource>)dataSource_
+{
+	GtkListStore *listStore = gtk_list_store_new(1, G_TYPE_STRING);
+	GtkTreeIter iter;
+	OGComboBoxItem* (*itemAtIndex)(id, SEL, OGComboBox*, size_t);
+
+	dataSource = dataSource_;
+	itemAtIndex = (OGComboBoxItem*(*)(id, SEL, OGComboBox*, size_t))
+	    [dataSource methodForSelector: @selector(comboBox:itemAtIndex:)];
+
+	size_t i, size = [dataSource numberOfItemsInComboBox: self];
+	for (i = 0; i < size; i++) {
+		OGComboBoxItem *item = itemAtIndex(dataSource,
+		    @selector(comboBox:itemAtIndex:), self, i);
+
+		gtk_list_store_append(listStore, &iter);
+		gtk_list_store_set(listStore, &iter, 0,
+		    [item.label UTF8String], -1);
+	}
+
+	gtk_combo_box_set_model(GTK_COMBO_BOX(widget),
+	    GTK_TREE_MODEL(listStore));
+}
+
+- (void)OG_changed
+{
+	OFAutoreleasePool *pool = [OFAutoreleasePool new];
+
+	if ([delegate respondsToSelector: @selector(comboBoxWasChanged:)])
+		[delegate comboBoxWasChanged: self];
+
+	[pool release];
+}
+@end