another UI attempt, I guess.

sorry.

src/libui_sdl/libui/unix/fontbutton.c

@@ -0,0 +1,70 @@
+// 14 april 2016
+#include "uipriv_unix.h"
+
+struct uiFontButton {
+	uiUnixControl c;
+	GtkWidget *widget;
+	GtkButton *button;
+	GtkFontButton *fb;
+	GtkFontChooser *fc;
+	void (*onChanged)(uiFontButton *, void *);
+	void *onChangedData;
+};
+
+uiUnixControlAllDefaults(uiFontButton)
+
+// TODO NOTE no need to inhibit the signal; font-set is documented as only being sent when the user changes the font
+static void onFontSet(GtkFontButton *button, gpointer data)
+{
+	uiFontButton *b = uiFontButton(data);
+
+	(*(b->onChanged))(b, b->onChangedData);
+}
+
+static void defaultOnChanged(uiFontButton *b, void *data)
+{
+	// do nothing
+}
+
+uiDrawTextFont *uiFontButtonFont(uiFontButton *b)
+{
+	PangoFont *f;
+	PangoFontDescription *desc;
+
+	desc = gtk_font_chooser_get_font_desc(b->fc);
+	f = pangoDescToPangoFont(desc);
+	// desc is transfer-full and thus is a copy
+	pango_font_description_free(desc);
+	return mkTextFont(f, FALSE);			// we hold the initial reference; no need to ref
+}
+
+void uiFontButtonOnChanged(uiFontButton *b, void (*f)(uiFontButton *, void *), void *data)
+{
+	b->onChanged = f;
+	b->onChangedData = data;
+}
+
+uiFontButton *uiNewFontButton(void)
+{
+	uiFontButton *b;
+
+	uiUnixNewControl(uiFontButton, b);
+
+	b->widget = gtk_font_button_new();
+	b->button = GTK_BUTTON(b->widget);
+	b->fb = GTK_FONT_BUTTON(b->widget);
+	b->fc = GTK_FONT_CHOOSER(b->widget);
+
+	// match behavior on other platforms
+	gtk_font_button_set_show_style(b->fb, TRUE);
+	gtk_font_button_set_show_size(b->fb, TRUE);
+	gtk_font_button_set_use_font(b->fb, FALSE);
+	gtk_font_button_set_use_size(b->fb, FALSE);
+	// other customizations
+	gtk_font_chooser_set_show_preview_entry(b->fc, TRUE);
+
+	g_signal_connect(b->widget, "font-set", G_CALLBACK(onFontSet), b);
+	uiFontButtonOnChanged(b, defaultOnChanged, NULL);
+
+	return b;
+}