gnome-control-center/capplets/font/main.c

/* This program was written with lots of love under the GPL by Jonathan
 * Blandford <jrb@gnome.org>
 */

#include <config.h>

#include <string.h>
#include <gtk/gtk.h>
#include <gconf/gconf-client.h>
#include <glade/glade.h>
#include <stdarg.h>
#include <math.h>

#ifdef HAVE_XFT2
#include <gdk/gdkx.h>
#include <X11/Xft/Xft.h>
#endif /* HAVE_XFT2 */

#include "capplet-util.h"
#include "activate-settings-daemon.h"
#include "gconf-property-editor.h"

#ifdef HAVE_XFT2
static void cb_show_details (GtkWidget *button,
			     GtkWindow *parent);
#endif /* HAVE_XFT2 */

#define GTK_FONT_KEY           "/desktop/gnome/interface/font_name"
#define DESKTOP_FONT_KEY       "/apps/nautilus/preferences/desktop_font"

#define METACITY_DIR "/apps/metacity/general"
#define WINDOW_TITLE_FONT_KEY METACITY_DIR "/titlebar_font"
#define WINDOW_TITLE_USES_SYSTEM_KEY METACITY_DIR "/titlebar_uses_system_font"
#define MONOSPACE_FONT_KEY "/desktop/gnome/interface/monospace_font_name"
#define DOCUMENT_FONT_KEY "/desktop/gnome/interface/document_font_name"

#ifdef HAVE_XFT2
#define FONT_RENDER_DIR "/desktop/gnome/font_rendering"
#define FONT_ANTIALIASING_KEY FONT_RENDER_DIR "/antialiasing"
#define FONT_HINTING_KEY      FONT_RENDER_DIR "/hinting"
#define FONT_RGBA_ORDER_KEY   FONT_RENDER_DIR "/rgba_order"
#define FONT_DPI_KEY          FONT_RENDER_DIR "/dpi"

#endif /* HAVE_XFT2 */
static gboolean in_change = FALSE;
static gchar *old_font = NULL;

#define MAX_FONT_POINT_WITHOUT_WARNING 32
#define MAX_FONT_SIZE_WITHOUT_WARNING MAX_FONT_POINT_WITHOUT_WARNING*1024

static void
cb_dialog_response (GtkDialog *dialog, gint response_id)
{
	if (response_id == GTK_RESPONSE_HELP)
		capplet_help (GTK_WINDOW (dialog),
			"user-guide.xml",
			"goscustdesk-38");
	else
		gtk_main_quit ();
}

#ifdef HAVE_XFT2

/*
 * Code for displaying previews of font rendering with various Xft options
 */

static void
sample_size_request (GtkWidget      *darea,
		     GtkRequisition *requisition)
{
	GdkPixbuf *pixbuf = g_object_get_data (G_OBJECT (darea), "sample-pixbuf");

	requisition->width = gdk_pixbuf_get_width (pixbuf) + 2;
	requisition->height = gdk_pixbuf_get_height (pixbuf) + 2;
}

static void
sample_expose (GtkWidget      *darea,
	       GdkEventExpose *expose)
{
	GdkPixbuf *pixbuf = g_object_get_data (G_OBJECT (darea), "sample-pixbuf");
	int width = gdk_pixbuf_get_width (pixbuf);
	int height = gdk_pixbuf_get_height (pixbuf);

	int x = (darea->allocation.width - width) / 2;
	int y = (darea->allocation.height - height) / 2;

	gdk_draw_rectangle (darea->window, darea->style->white_gc, TRUE,
			    0, 0,
			    darea->allocation.width, darea->allocation.height);
	gdk_draw_rectangle (darea->window, darea->style->black_gc, FALSE,
			    0, 0,
			    darea->allocation.width - 1, darea->allocation.height - 1);

	gdk_pixbuf_render_to_drawable (pixbuf, darea->window, NULL,
				       0, 0, x, y, width, height,
				       GDK_RGB_DITHER_NORMAL, 0, 0);
}

typedef enum {
	ANTIALIAS_NONE,
	ANTIALIAS_GRAYSCALE,
	ANTIALIAS_RGBA
} Antialiasing;

static GConfEnumStringPair antialias_enums[] = {
	{ ANTIALIAS_NONE,      "none" },
	{ ANTIALIAS_GRAYSCALE, "grayscale" },
	{ ANTIALIAS_RGBA,      "rgba" },
	{ -1,                  NULL }
};

typedef enum {
	HINT_NONE,
	HINT_SLIGHT,
	HINT_MEDIUM,
	HINT_FULL
} Hinting;

static GConfEnumStringPair hint_enums[] = {
	{ HINT_NONE,   "none" },
	{ HINT_SLIGHT, "slight" },
	{ HINT_MEDIUM, "medium" },
	{ HINT_FULL,   "full" },
	{ -1,          NULL }
};

typedef enum {
	RGBA_RGB,
	RGBA_BGR,
	RGBA_VRGB,
	RGBA_VBGR
} RgbaOrder;

static GConfEnumStringPair rgba_order_enums[] = {
	{ RGBA_RGB,  "rgb" },
	{ RGBA_BGR,  "bgr" },
	{ RGBA_VRGB, "vrgb" },
	{ RGBA_VBGR, "vbgr" },
	{ -1,         NULL }
};

static XftFont *
open_pattern (FcPattern   *pattern,
	      Antialiasing antialiasing,
	      Hinting      hinting)
{
#ifdef FC_HINT_STYLE
	static const int hintstyles[] = { FC_HINT_NONE, FC_HINT_SLIGHT, FC_HINT_MEDIUM, FC_HINT_FULL };
#endif /* FC_HINT_STYLE */

	FcPattern *res_pattern;
	FcResult result;
	XftFont *font;

	Display *xdisplay = gdk_x11_get_default_xdisplay ();
	int screen = gdk_x11_get_default_screen ();

	res_pattern = XftFontMatch (xdisplay, screen, pattern, &result);
	if (res_pattern == NULL)
		return NULL;

	FcPatternDel (res_pattern, FC_HINTING);
	FcPatternAddBool (res_pattern, FC_HINTING, hinting != HINT_NONE);

#ifdef FC_HINT_STYLE
	FcPatternDel (res_pattern, FC_HINT_STYLE);
	FcPatternAddInteger (res_pattern, FC_HINT_STYLE, hintstyles[hinting]);
#endif /* FC_HINT_STYLE */

	FcPatternDel (res_pattern, FC_ANTIALIAS);
	FcPatternAddBool (res_pattern, FC_ANTIALIAS, antialiasing != ANTIALIAS_NONE);

	FcPatternDel (res_pattern, FC_RGBA);
	FcPatternAddInteger (res_pattern, FC_RGBA,
			     antialiasing == ANTIALIAS_RGBA ? FC_RGBA_RGB : FC_RGBA_NONE);

	FcPatternDel (res_pattern, FC_DPI);
	FcPatternAddInteger (res_pattern, FC_DPI, 96);

	font = XftFontOpenPattern (xdisplay, res_pattern);
	if (!font)
		FcPatternDestroy (res_pattern);

	return font;
}

static void
setup_font_sample (GtkWidget   *darea,
		   Antialiasing antialiasing,
		   Hinting      hinting)
{
	const char *string1 = "abcfgop AO ";
	const char *string2 = "abcfgop";

	XftColor black, white;
	XRenderColor rendcolor;

	Display *xdisplay = gdk_x11_get_default_xdisplay ();

	GdkColormap *colormap = gdk_rgb_get_colormap ();
	Colormap xcolormap = GDK_COLORMAP_XCOLORMAP (colormap);

	GdkVisual *visual = gdk_colormap_get_visual (colormap);
	Visual *xvisual = GDK_VISUAL_XVISUAL (visual);

	FcPattern *pattern;
	XftFont *font1, *font2;
	XGlyphInfo extents1 = { 0 };
	XGlyphInfo extents2 = { 0 };
	GdkPixmap *pixmap;
	XftDraw *draw;
	GdkPixbuf *tmp_pixbuf, *pixbuf;

	int width, height;
	int ascent, descent;

	pattern = FcPatternBuild (NULL,
				  FC_FAMILY, FcTypeString, "Serif",
				  FC_SLANT, FcTypeInteger, FC_SLANT_ROMAN,
				  FC_SIZE, FcTypeDouble, 18.,
				  NULL);
	font1 = open_pattern (pattern, antialiasing, hinting);
	FcPatternDestroy (pattern);

	pattern = FcPatternBuild (NULL,
				  FC_FAMILY, FcTypeString, "Serif",
				  FC_SLANT, FcTypeInteger, FC_SLANT_ITALIC,
				  FC_SIZE, FcTypeDouble, 20.,
				  NULL);
	font2 = open_pattern (pattern, antialiasing, hinting);
	FcPatternDestroy (pattern);

	if (font1)
		XftTextExtentsUtf8 (xdisplay, font1, (unsigned char *)string1, strlen (string1), &extents1);
	if (font2)
		XftTextExtentsUtf8 (xdisplay, font2, (unsigned char *)string2, strlen (string2), &extents2);

	ascent = 0;
	if (font1)
		ascent = MAX (ascent, font1->ascent);
	if (font2)
		ascent = MAX (ascent, font2->ascent);

	descent = 0;
	if (font1)
		descent = MAX (descent, font1->descent);
	if (font2)
		descent = MAX (descent, font2->descent);

	width = extents1.xOff + extents2.xOff + 4;

	height = ascent + descent + 2;

	pixmap = gdk_pixmap_new (NULL, width, height, visual->depth);

	draw = XftDrawCreate (xdisplay, GDK_DRAWABLE_XID (pixmap), xvisual, xcolormap);

	rendcolor.red = 0;
	rendcolor.green = 0;
	rendcolor.blue = 0;
	rendcolor.alpha = 0xffff;
	XftColorAllocValue (xdisplay, xvisual, xcolormap, &rendcolor, &black);
	
	rendcolor.red = 0xffff;
	rendcolor.green = 0xffff;
	rendcolor.blue = 0xffff;
	rendcolor.alpha = 0xffff;
	XftColorAllocValue (xdisplay, xvisual, xcolormap, &rendcolor, &white);
	XftDrawRect (draw, &white, 0, 0, width, height);
	if (font1)
		XftDrawStringUtf8 (draw, &black, font1,
				   2, 2 + ascent,
				   (unsigned char *)string1, strlen (string1));
	if (font2)
		XftDrawStringUtf8 (draw, &black, font2,
				   2 + extents1.xOff, 2 + ascent,
				   (unsigned char *)string2, strlen (string2));

	XftDrawDestroy (draw);

	if (font1)
		XftFontClose (xdisplay, font1);
	if (font2)
		XftFontClose (xdisplay, font2);

	tmp_pixbuf = gdk_pixbuf_get_from_drawable (NULL, pixmap, colormap, 0, 0, 0, 0, width, height);
	pixbuf = gdk_pixbuf_scale_simple (tmp_pixbuf, 1 * width, 1 * height, GDK_INTERP_TILES);

	g_object_unref (pixmap);
	g_object_unref (tmp_pixbuf);

	g_object_set_data_full (G_OBJECT (darea), "sample-pixbuf",
				pixbuf, (GDestroyNotify)g_object_unref);

	g_signal_connect (darea, "size_request", G_CALLBACK (sample_size_request), NULL);
	g_signal_connect (darea, "expose_event", G_CALLBACK (sample_expose), NULL);
}

/*
 * Code implementing a group of radio buttons with different Xft option combinations.
 * If one of the buttons is matched by the GConf key, we pick it. Otherwise we
 * show the group as inconsistent.
 */
static void
font_render_get_gconf (Antialiasing *antialiasing,
		       Hinting      *hinting)
{
	GConfClient *client = gconf_client_get_default ();
	char *antialias_str = gconf_client_get_string (client, FONT_ANTIALIASING_KEY, NULL);
	char *hint_str = gconf_client_get_string (client, FONT_HINTING_KEY, NULL);
	int val;

	val = ANTIALIAS_GRAYSCALE;
	if (antialias_str) {
		gconf_string_to_enum (antialias_enums, antialias_str, &val);
		g_free (antialias_str);
	}
	*antialiasing = val;

	val = HINT_FULL;
	if (hint_str) {
		gconf_string_to_enum (hint_enums, hint_str, &val);
		g_free (hint_str);
	}
	*hinting = val;

	g_object_unref (client);
}

typedef struct {
	Antialiasing antialiasing;
	Hinting hinting;
	GtkWidget *radio;
} FontPair;

static GSList *font_pairs = NULL;

static void
font_render_load (void)
{
	Antialiasing antialiasing;
	Hinting hinting;
	gboolean inconsistent = TRUE;
	GSList *tmp_list;

	font_render_get_gconf (&antialiasing, &hinting);

	in_change = TRUE;

	for (tmp_list = font_pairs; tmp_list; tmp_list = tmp_list->next) {
		FontPair *pair = tmp_list->data;

		if (antialiasing == pair->antialiasing && hinting == pair->hinting) {
			gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (pair->radio), TRUE);
			inconsistent = FALSE;
		}
	}

	for (tmp_list = font_pairs; tmp_list; tmp_list = tmp_list->next) {
		FontPair *pair = tmp_list->data;

		gtk_toggle_button_set_inconsistent (GTK_TOGGLE_BUTTON (pair->radio), inconsistent);
	}

	in_change = FALSE;
}

static void
font_render_changed (GConfClient *client,
                     guint        cnxn_id,
                     GConfEntry  *entry,
                     gpointer     user_data)
{
	font_render_load ();
}

static void
font_radio_toggled (GtkToggleButton *toggle_button,
		    FontPair        *pair)
{
	if (!in_change) {
		GConfClient *client = gconf_client_get_default ();

		gconf_client_set_string (client, FONT_ANTIALIASING_KEY,
					 gconf_enum_to_string (antialias_enums, pair->antialiasing),
					 NULL);
		gconf_client_set_string (client, FONT_HINTING_KEY,
					 gconf_enum_to_string (hint_enums, pair->hinting),
					 NULL);

		g_object_unref (client);
	}

	/* Restore back to the previous state until we get notification
	 */
	font_render_load ();
}

static void
setup_font_pair (GtkWidget    *radio,
		 GtkWidget    *darea,
		 Antialiasing  antialiasing,
		 Hinting       hinting)
{
	FontPair *pair = g_new (FontPair, 1);

	pair->antialiasing = antialiasing;
	pair->hinting = hinting;
	pair->radio = radio;

	setup_font_sample (darea, antialiasing, hinting);
	font_pairs = g_slist_prepend (font_pairs, pair);

	g_signal_connect (radio, "toggled",
			  G_CALLBACK (font_radio_toggled), pair);
}
#endif /* HAVE_XFT2 */

static void
metacity_titlebar_load_sensitivity (GConfClient *client,
				    GladeXML    *dialog)
{
	gtk_widget_set_sensitive (WID ("window_title_font"),
				  !gconf_client_get_bool (client,
							  WINDOW_TITLE_USES_SYSTEM_KEY,
							  NULL));
}

static void
metacity_changed (GConfClient *client,
		  guint        cnxn_id,
		  GConfEntry  *entry,
		  gpointer     user_data)
{
	if (strcmp (entry->key, WINDOW_TITLE_USES_SYSTEM_KEY) == 0)
		metacity_titlebar_load_sensitivity (client, user_data);
}

/* returns 0 if the font is safe, otherwise returns the size in points. */
static gint
new_font_dangerous (const char *new_font)
{
	PangoFontDescription *pfd;
	gboolean retval = 0;

	pfd = pango_font_description_from_string (new_font);
	if (pfd == NULL)
		/* an invalid font was passed in.  This isn't our problem. */
		return 0;

	if (pango_font_description_get_set_fields (pfd) & PANGO_FONT_MASK_SIZE) {
		if (pango_font_description_get_size (pfd) >= MAX_FONT_SIZE_WITHOUT_WARNING) {
			retval = pango_font_description_get_size (pfd)/1024;
		}
	}
	pango_font_description_free (pfd);

	return retval;
}

static GConfValue *
application_font_to_gconf (GConfPropertyEditor *peditor,
			   GConfValue          *value)
{
	GConfValue *new_value;
	const char *new_font;
	GtkWidget *font_button;
	gint danger_level;

	font_button = GTK_WIDGET (gconf_property_editor_get_ui_control (peditor));
	g_return_val_if_fail (font_button != NULL, NULL);

	new_value = gconf_value_new (GCONF_VALUE_STRING);
	new_font = gconf_value_get_string (value);
	if (new_font_dangerous (old_font)) {
		/* If we're already too large, we don't warn again. */
		gconf_value_set_string (new_value, new_font);
		return new_value;
	}

	danger_level = new_font_dangerous (new_font);
	if (danger_level) {
		GtkWidget *warning_dialog, *apply_button;
		gchar *warning_label;
		gchar *warning_label2;

		warning_label = g_strdup (_("Font may be too large"));

		if (danger_level > MAX_FONT_POINT_WITHOUT_WARNING) {
			warning_label2 = g_strdup_printf (ngettext (
				"The font selected is %d point large, "
				"and may make it difficult to effectively "
				"use the computer.  It is recommended that "
				"you select a size smaller than %d.",
				"The font selected is %d points large, "
				"and may make it difficult to effectively "
				"use the computer. It is recommended that "
				"you select a size smaller than %d.",
				danger_level),
				danger_level,
				MAX_FONT_POINT_WITHOUT_WARNING);
		} else {
			warning_label2 = g_strdup_printf (ngettext (
				"The font selected is %d point large, "
				"and may make it difficult to effectively "
				"use the computer.  It is recommended that "
				"you select a smaller sized font.",
				"The font selected is %d points large, "
				"and may make it difficult to effectively "
				"use the computer. It is recommended that "
				"you select a smaller sized font.",
				danger_level),
				danger_level);
		}

		warning_dialog = gtk_message_dialog_new (NULL,
							 GTK_DIALOG_MODAL,
							 GTK_MESSAGE_WARNING,
							 GTK_BUTTONS_NONE,
							 warning_label);

		gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (warning_dialog),
							  warning_label2);

		gtk_dialog_add_button (GTK_DIALOG (warning_dialog), _("Use previous font"), GTK_RESPONSE_CLOSE);

		apply_button = gtk_button_new_with_label (_("Use selected font"));

		gtk_button_set_image (GTK_BUTTON (apply_button), gtk_image_new_from_stock (GTK_STOCK_APPLY, GTK_ICON_SIZE_BUTTON));
		gtk_dialog_add_action_widget (GTK_DIALOG (warning_dialog), apply_button, GTK_RESPONSE_APPLY);
		GTK_WIDGET_SET_FLAGS (apply_button, GTK_CAN_DEFAULT);
		gtk_widget_show (apply_button);

		gtk_dialog_set_default_response (GTK_DIALOG (warning_dialog), GTK_RESPONSE_CLOSE);

		g_free (warning_label);
		g_free (warning_label2);

		if (gtk_dialog_run (GTK_DIALOG (warning_dialog)) == GTK_RESPONSE_APPLY) {
			gconf_value_set_string (new_value, new_font);
		} else {
			gconf_value_set_string (new_value, old_font);
			gtk_font_button_set_font_name (GTK_FONT_BUTTON (font_button), old_font);
		}

		gtk_widget_destroy (warning_dialog);
	} else {
		gconf_value_set_string (new_value, new_font);
	}

	return new_value;
}

static void
application_font_changed (GtkWidget *font_button)
{
	const gchar *font;

	font = gtk_font_button_get_font_name (GTK_FONT_BUTTON (font_button));
	g_free (old_font);
	old_font = g_strdup (font);
}

static void
setup_dialog (void)
{
	GladeXML *dialog;
	GConfClient *client;
	GtkWidget *widget;
	GObject *peditor;

	dialog = glade_xml_new (GLADEDIR "/font-properties.glade", "font_dialog", NULL);
	if (!dialog) {
		g_warning ("could not load font-properties.glade");
		return;
	}

	client = gconf_client_get_default ();

	gconf_client_add_dir (client, "/desktop/gnome/interface", GCONF_CLIENT_PRELOAD_ONELEVEL, NULL);
	gconf_client_add_dir (client, "/apps/nautilus/preferences", GCONF_CLIENT_PRELOAD_ONELEVEL, NULL);
	gconf_client_add_dir (client, METACITY_DIR, GCONF_CLIENT_PRELOAD_ONELEVEL, NULL);
#ifdef HAVE_XFT2
	gconf_client_add_dir (client, FONT_RENDER_DIR, GCONF_CLIENT_PRELOAD_ONELEVEL, NULL);
#endif  /* HAVE_XFT2 */

	peditor = gconf_peditor_new_font (NULL, GTK_FONT_KEY,
					  WID ("application_font"),
					  "conv-from-widget-cb", application_font_to_gconf,
					  NULL);
	g_signal_connect_swapped (peditor, "value-changed",
				  G_CALLBACK (application_font_changed), WID ("application_font"));
	application_font_changed (WID ("application_font"));

	peditor = gconf_peditor_new_font (NULL, DOCUMENT_FONT_KEY,
					  WID ("document_font"),
					  NULL);

	peditor = gconf_peditor_new_font (NULL, DESKTOP_FONT_KEY,
					  WID ("desktop_font"),
					  NULL);

	peditor = gconf_peditor_new_font (NULL, WINDOW_TITLE_FONT_KEY,
					  WID ("window_title_font"),
					  NULL);

	peditor = gconf_peditor_new_font (NULL, MONOSPACE_FONT_KEY,
					  WID ("monospace_font"),
					  NULL);

	gconf_client_notify_add (client, METACITY_DIR,
				 metacity_changed,
				 dialog, NULL, NULL);

	metacity_titlebar_load_sensitivity (client, dialog);

	widget = WID ("font_dialog");
	capplet_set_icon (widget, "gnome-settings-font");

#ifdef HAVE_XFT2
	setup_font_pair (WID ("monochrome_radio"),    WID ("monochrome_sample"),    ANTIALIAS_NONE,      HINT_FULL);
	setup_font_pair (WID ("best_shapes_radio"),   WID ("best_shapes_sample"),   ANTIALIAS_GRAYSCALE, HINT_MEDIUM);
	setup_font_pair (WID ("best_contrast_radio"), WID ("best_contrast_sample"), ANTIALIAS_GRAYSCALE, HINT_FULL);
	setup_font_pair (WID ("subpixel_radio"),      WID ("subpixel_sample"),      ANTIALIAS_RGBA,      HINT_FULL);

	font_render_load ();

	gconf_client_notify_add (client, FONT_RENDER_DIR,
				 font_render_changed,
				 NULL, NULL, NULL);

	g_signal_connect (WID ("details_button"), "clicked",
			  G_CALLBACK (cb_show_details), widget);
#else /* !HAVE_XFT2 */
	gtk_widget_hide (WID ("font_render_frame"));
#endif /* HAVE_XFT2 */

	g_signal_connect (widget, "response",
			  G_CALLBACK (cb_dialog_response), NULL);

	gtk_widget_show (widget);

	g_object_unref (client);
}

#ifdef HAVE_XFT2
/*
 * EnumGroup - a group of radio buttons tied to a string enumeration
 *             value. We add this here because the gconf peditor
 *             equivalent of this is both painful to use (you have
 *             to supply functions to convert from enums to indices)
 *             and conceptually broken (the order of radio buttons
 *             in a group when using Glade is not predictable.
 */
typedef struct
{
	GConfClient *client;
	GSList *items;
	const gchar *gconf_key;
	GConfEnumStringPair *enums;
	int default_value;
} EnumGroup;

typedef struct
{
	EnumGroup *group;
	GtkWidget *widget;
	int value;
} EnumItem;

static void
enum_group_load (EnumGroup *group)
{
	char *str = gconf_client_get_string (group->client, group->gconf_key, NULL);
	int val = group->default_value;
	GSList *tmp_list;

	if (str)
		gconf_string_to_enum (group->enums, str, &val);

	g_free (str);

	in_change = TRUE;

	for (tmp_list = group->items; tmp_list; tmp_list = tmp_list->next) {
		EnumItem *item = tmp_list->data;

		if (val == item->value)
			gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (item->widget), TRUE);
	}



	in_change = FALSE;
}

static void
enum_group_changed (GConfClient *client,
		    guint        cnxn_id,
		    GConfEntry  *entry,
		    gpointer     user_data)
{
	enum_group_load (user_data);
}

static void
enum_item_toggled (GtkToggleButton *toggle_button,
		   EnumItem      *item)
{
	EnumGroup *group = item->group;

	if (!in_change) {
		gconf_client_set_string (group->client, group->gconf_key,
					 gconf_enum_to_string (group->enums, item->value),
					 NULL);
	}

	/* Restore back to the previous state until we get notification
	 */
	enum_group_load (group);
}

static EnumGroup *
enum_group_create (const gchar         *gconf_key,
		   GConfEnumStringPair *enums,
		   int                  default_value,
		   GtkWidget           *first_widget,
		   ...)
{
	EnumGroup *group;
	GtkWidget *widget;
	va_list args;

	group = g_new (EnumGroup, 1);

	group->client = gconf_client_get_default ();
	group->gconf_key = g_strdup (gconf_key);
	group->enums = enums;
	group->default_value = default_value;
	group->items = NULL;

	va_start (args, first_widget);

	widget = first_widget;
	while (widget)
	{
		EnumItem *item;

		item = g_new (EnumItem, 1);
		item->group = group;
		item->widget = widget;
		item->value = va_arg (args, int);

		g_signal_connect (item->widget, "toggled",
				  G_CALLBACK (enum_item_toggled), item);

		group->items = g_slist_prepend (group->items, item);

		widget = va_arg (args, GtkWidget *);
	}

	va_end (args);

	enum_group_load (group);

	gconf_client_notify_add (group->client, gconf_key,
				 enum_group_changed,
				 group, NULL, NULL);

 	return group;
}

/*
 * The font rendering details dialog
 */
static void
dpi_load (GConfClient   *client,
	  GtkSpinButton *spinner)
{
	gdouble dpi = gconf_client_get_float (client, FONT_DPI_KEY, NULL);

	if (dpi < 50.)
		dpi = 50.;

	in_change = TRUE;
	gtk_spin_button_set_value (spinner, dpi);
	in_change = FALSE;
}

static void
dpi_changed (GConfClient *client,
	     guint        cnxn_id,
	     GConfEntry  *entry,
	     gpointer     user_data)
{
	dpi_load (client, user_data);
}

static void
dpi_value_changed (GtkSpinButton *spinner,
		   GConfClient   *client)
{
	/* Like any time when using a spin button with GConf, there is
	 * a race condition here. When we change, we send the new
	 * value to GCOnf, then restore to the old value until
	 * we get a response to emulate the proper model/view behavior.
	 *
	 * If the user changes the value faster than responses are
	 * received from GConf, this may cause mild strange effects.
	 */
	gdouble new_dpi = gtk_spin_button_get_value (spinner);

	gconf_client_set_float (client, FONT_DPI_KEY, new_dpi, NULL);

	dpi_load (client, spinner);
}

static void
cb_details_response (GtkDialog *dialog, gint response_id)
{
	if (response_id == GTK_RESPONSE_HELP)
		capplet_help (GTK_WINDOW (dialog),
			      "user-guide.xml",
			      "goscustdesk-38");
	else if (response_id == 1) {
		/* "Go to font folder" was clicked */
		g_spawn_command_line_async ("nautilus --no-desktop fonts:///", NULL);
	} else
		gtk_widget_hide (GTK_WIDGET (dialog));
}

static void
cb_show_details (GtkWidget *button,
		 GtkWindow *parent)
{
	static GtkWidget *details_dialog = NULL;

	if (!details_dialog) {
		GConfClient *client = gconf_client_get_default ();
		GladeXML *dialog;
		GtkWidget *dpi_spinner;
		GnomeVFSURI *uri;
		int dpi;
		GtkAdjustment *adjustment;

		dialog = glade_xml_new (GLADEDIR "/font-properties.glade", "render_details", NULL);
		if (!dialog) {
			g_warning ("could not load font-properties.glade");
			return;
		}

		details_dialog = WID ("render_details");
		uri = gnome_vfs_uri_new ("fonts:///");
		if (uri == NULL) {
			gtk_widget_hide (WID ("go_to_font_button"));
		} else {
			gnome_vfs_uri_unref (uri);
			gtk_widget_show (WID ("go_to_font_button"));
		}

		gtk_window_set_transient_for (GTK_WINDOW (details_dialog), parent);

		dpi_spinner = WID ("dpi_spinner");

		/* pick a sensible maximum dpi */
		dpi = floor ((gdk_screen_width () / gdk_screen_width_mm () +
			      gdk_screen_height () / gdk_screen_height_mm ()) * 25.4 / 2. + .5);
		if (dpi < 50)
			 dpi = 50; /* be extra careful */
		adjustment = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (dpi_spinner));
		adjustment->upper = dpi * 3;

		dpi_load (client, GTK_SPIN_BUTTON (dpi_spinner));
		g_signal_connect (dpi_spinner, "value_changed",
				  G_CALLBACK (dpi_value_changed), client);

		gconf_client_notify_add (client, FONT_DPI_KEY,
					 dpi_changed,
					 dpi_spinner, NULL, NULL);

		setup_font_sample (WID ("antialias_none_sample"),      ANTIALIAS_NONE,      HINT_FULL);
		setup_font_sample (WID ("antialias_grayscale_sample"), ANTIALIAS_GRAYSCALE, HINT_FULL);
		setup_font_sample (WID ("antialias_subpixel_sample"),  ANTIALIAS_RGBA,      HINT_FULL);

		enum_group_create (FONT_ANTIALIASING_KEY, antialias_enums, ANTIALIAS_GRAYSCALE,
				     WID ("antialias_none_radio"), ANTIALIAS_NONE,
				     WID ("antialias_grayscale_radio"), ANTIALIAS_GRAYSCALE,
				     WID ("antialias_subpixel_radio"), ANTIALIAS_RGBA,
				     NULL);

		setup_font_sample (WID ("hint_none_sample"),    ANTIALIAS_GRAYSCALE, HINT_NONE);
		setup_font_sample (WID ("hint_slight_sample"),  ANTIALIAS_GRAYSCALE, HINT_SLIGHT);
		setup_font_sample (WID ("hint_medium_sample"),  ANTIALIAS_GRAYSCALE, HINT_MEDIUM);
		setup_font_sample (WID ("hint_full_sample"),    ANTIALIAS_GRAYSCALE, HINT_FULL);

		enum_group_create (FONT_HINTING_KEY, hint_enums, HINT_FULL,
				   WID ("hint_none_radio"),   HINT_NONE,
				   WID ("hint_slight_radio"), HINT_SLIGHT,
				   WID ("hint_medium_radio"), HINT_MEDIUM,
				   WID ("hint_full_radio"),   HINT_FULL,
				   NULL);

		gtk_image_set_from_file (GTK_IMAGE (WID ("subpixel_rgb_image")),
					 PIXMAPDIR "/subpixel-rgb.png");
		gtk_image_set_from_file (GTK_IMAGE (WID ("subpixel_bgr_image")),
					 PIXMAPDIR "/subpixel-bgr.png");
		gtk_image_set_from_file (GTK_IMAGE (WID ("subpixel_vrgb_image")),
					 PIXMAPDIR "/subpixel-vrgb.png");
		gtk_image_set_from_file (GTK_IMAGE (WID ("subpixel_vbgr_image")),
					 PIXMAPDIR "/subpixel-vbgr.png");

		enum_group_create (FONT_RGBA_ORDER_KEY, rgba_order_enums, RGBA_RGB,
				   WID ("subpixel_rgb_radio"),  RGBA_RGB,
				   WID ("subpixel_bgr_radio"),  RGBA_BGR,
				   WID ("subpixel_vrgb_radio"), RGBA_VRGB,
				   WID ("subpixel_vbgr_radio"), RGBA_VBGR,
				   NULL);

		g_signal_connect (G_OBJECT (details_dialog),
				  "response",
				  G_CALLBACK (cb_details_response), NULL);
		g_signal_connect (G_OBJECT (details_dialog),
				  "delete_event",
				  G_CALLBACK (gtk_true), NULL);

		g_object_unref (dialog);
		g_object_unref (client);
	}

	gtk_window_present (GTK_WINDOW (details_dialog));
}
#endif /* HAVE_XFT2 */

int
main (int argc, char *argv[])
{
	bindtextdomain (GETTEXT_PACKAGE, GNOMELOCALEDIR);
	bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
	textdomain (GETTEXT_PACKAGE);

	gnome_program_init ("gnome-font-properties", VERSION,
			    LIBGNOMEUI_MODULE, argc, argv,
			    GNOME_PARAM_APP_DATADIR, GNOMECC_DATA_DIR,
			    NULL);

	activate_settings_daemon ();

	setup_dialog ();

	gtk_main ();

	return 0;
}