path: root/gtk/gui_prefs.c

/* gui_prefs.c
 * Dialog box for GUI preferences
 *
 * $Id: gui_prefs.c,v 1.19 2000/09/09 10:35:53 guy Exp $
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@zing.org>
 * Copyright 1998 Gerald Combs
 *
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <errno.h>

#include "globals.h"
#include "gui_prefs.h"
#include "gtkglobals.h"
#include "prefs_dlg.h"
#include "follow_dlg.h"
#include "help_dlg.h"
#include "prefs.h"
#include "prefs-int.h"
#include "ui_util.h"
#include "simple_dialog.h"
#include "dlg_utils.h"
#include "proto_draw.h"
#include "main.h"

static void create_option_menu(GtkWidget *main_vb, const gchar *key,
    GtkWidget *main_tb, int table_position,
    const gchar *label_text, const enum_val *enumvals, gint current_val);
static void font_browse_cb(GtkWidget *w, gpointer data);
static void font_browse_ok_cb(GtkWidget *w, GtkFontSelectionDialog *fs);
static void font_browse_destroy(GtkWidget *win, gpointer data);
static gint fetch_enum_value(gpointer control, const enum_val *enumvals);
static void color_browse_cb(GtkWidget *w, gpointer data);
static void update_text_color(GtkWidget *w, gpointer data);
static void update_current_color(GtkWidget *w, gpointer data);
static void color_ok_cb(GtkWidget *w, gpointer data);
static void color_cancel_cb(GtkWidget *w, gpointer data);
static gboolean color_delete_cb(GtkWidget *prefs_w, gpointer dummy);
static void color_destroy_cb(GtkWidget *w, gpointer data);
static void fetch_colors(void);

#define SCROLLBAR_PLACEMENT_KEY		"scrollbar_placement"
#define PLIST_SEL_BROWSE_KEY		"plist_sel_browse"
#define PTREE_SEL_BROWSE_KEY		"ptree_sel_browse"
#define PTREE_LINE_STYLE_KEY		"ptree_line_style"
#define PTREE_EXPANDER_STYLE_KEY	"ptree_expander_style"
#define HEX_DUMP_HIGHLIGHT_STYLE_KEY	"hex_dump_highlight_style"

#define FONT_DIALOG_PTR_KEY	"font_dialog_ptr"
#define FONT_CALLER_PTR_KEY	"font_caller_ptr"
#define COLOR_DIALOG_PTR_KEY	"color_dialog_ptr"
#define COLOR_CALLER_PTR_KEY	"color_caller_ptr"
#define COLOR_SAMPLE_PTR_KEY	"color_sample_ptr"
#define COLOR_SELECTION_PTR_KEY	"color_selection_ptr"

static const enum_val scrollbar_placement_vals[] = {
	{ "Left",  FALSE },
	{ "Right", TRUE },
	{ NULL,    0 }
};

static const enum_val selection_mode_vals[] = {
	{ "Selects", FALSE },
	{ "Browses", TRUE },
	{ NULL,      0 }
};

static const enum_val line_style_vals[] = {
	{ "None",   0 },
	{ "Solid",  1 },
	{ "Dotted", 2 },
	{ "Tabbed", 3 },
	{ NULL,     0 }
};

static const enum_val expander_style_vals[] = {
	{ "None",     0 },
	{ "Square",   1 },
	{ "Triangle", 2 },
	{ "Circular", 3 },
	{ NULL,       0 }
};

static const enum_val highlight_style_vals[] = {
  	{ "Bold",     0 },
  	{ "Inverse",  1 },
	{ NULL,       0 }
};

/* Set to FALSE initially; set to TRUE if the user ever hits "OK" on
   the "Colors..." dialog, so that we know that they (probably) changed
   colors, and therefore that the "apply" function needs to recolor
   any marked packets. */
static gboolean colors_changed;

/* Set to FALSE initially; set to TRUE if the user ever hits "OK" on
   the "Font..." dialog, so that we know that they (probably) changed
   the font, and therefore that the "apply" function needs to take care
   of that */
static gboolean font_changed;

/* Font name from the font dialog box; if "font_changed" is TRUE, this
   has been set to the name of the font the user selected. */
static gchar *new_font_name;

GtkWidget*
gui_prefs_show(void)
{
	GtkWidget	*main_tb, *main_vb, *font_bt, *color_bt;

	/* The colors or font haven't been changed yet. */
	colors_changed = FALSE;
	font_changed = FALSE;

	/* Main vertical box */
	main_vb = gtk_vbox_new(FALSE, 7);
	gtk_container_border_width( GTK_CONTAINER(main_vb), 5 );

	/* Main table */
	main_tb = gtk_table_new(7, 2, FALSE);
	gtk_box_pack_start( GTK_BOX(main_vb), main_tb, FALSE, FALSE, 0 );
	gtk_table_set_row_spacings( GTK_TABLE(main_tb), 10 );
	gtk_table_set_col_spacings( GTK_TABLE(main_tb), 15 );

	/* Scrollbar placement */
	create_option_menu(main_vb, SCROLLBAR_PLACEMENT_KEY, main_tb, 0,
	    "Vertical Scrollbar Placement:", scrollbar_placement_vals,
	    prefs.gui_scrollbar_on_right);

	/* Packet list selection browseable */
	create_option_menu(main_vb, PLIST_SEL_BROWSE_KEY, main_tb, 1,
	    "Packet-list selection bar movement:", selection_mode_vals,
	    prefs.gui_plist_sel_browse);

	/* Proto tree selection browseable */
	create_option_menu(main_vb, PTREE_SEL_BROWSE_KEY, main_tb, 2,
	    "Protocol-tree selection bar movement:", selection_mode_vals,
	    prefs.gui_ptree_sel_browse);

	/* Proto tree line style */
	create_option_menu(main_vb, PTREE_LINE_STYLE_KEY, main_tb, 3,
	    "Protocol-tree line style:", line_style_vals,
	    prefs.gui_ptree_line_style);

	/* Proto tree expander style */
	create_option_menu(main_vb, PTREE_EXPANDER_STYLE_KEY, main_tb, 4,
	    "Protocol-tree expander style:", expander_style_vals,
	    prefs.gui_ptree_expander_style);

	/* Hex Dump highlight style */
	create_option_menu(main_vb, HEX_DUMP_HIGHLIGHT_STYLE_KEY, main_tb, 5,
	    "Hex dump highlight style:", highlight_style_vals,
	    prefs.gui_hex_dump_highlight_style);

	/* "Font..." button - click to open a font selection dialog box. */
	font_bt = gtk_button_new_with_label("Font...");
	gtk_signal_connect(GTK_OBJECT(font_bt), "clicked",
	    GTK_SIGNAL_FUNC(font_browse_cb), NULL);
	gtk_table_attach_defaults( GTK_TABLE(main_tb), font_bt, 1, 2, 6, 7 );

	/* "Colors..." button - click to open a color selection dialog box. */
	color_bt = gtk_button_new_with_label("Colors...");
	gtk_signal_connect(GTK_OBJECT(color_bt), "clicked",
	    GTK_SIGNAL_FUNC(color_browse_cb), NULL);
	gtk_table_attach_defaults( GTK_TABLE(main_tb), color_bt, 1, 2, 7, 8 );

	/* Show 'em what we got */
	gtk_widget_show_all(main_vb);

	return(main_vb);
}

static void
create_option_menu(GtkWidget *main_vb, const gchar *key,
    GtkWidget *main_tb, int table_position,
    const gchar *label_text, const enum_val *enumvals, gint current_val)
{
	GtkWidget *label, *menu, *menu_item, *option_menu;
	int menu_index, index;
	const enum_val *enum_valp;

	label = gtk_label_new(label_text);
	gtk_misc_set_alignment(GTK_MISC(label), 1.0, 0.5);
	gtk_table_attach_defaults(GTK_TABLE(main_tb), label, 0, 1,
	    table_position, table_position + 1);

	/* Create a menu from the enumvals */
	menu = gtk_menu_new();
	menu_index = -1;
	for (enum_valp = enumvals, index = 0;
	    enum_valp->name != NULL; enum_valp++, index++) {
		menu_item = gtk_menu_item_new_with_label(enum_valp->name);
		gtk_menu_append(GTK_MENU(menu), menu_item);
		if (enum_valp->value == current_val)
			menu_index = index;
		gtk_widget_show(menu_item);
	}

	/* Create the option menu from the menu */
	option_menu = gtk_option_menu_new();
	gtk_option_menu_set_menu(GTK_OPTION_MENU(option_menu), menu);

	/* Set its current value to the variable's current value */
	if (menu_index != -1)
		gtk_option_menu_set_history(GTK_OPTION_MENU(option_menu),
		    menu_index);

	gtk_table_attach_defaults(GTK_TABLE(main_tb), option_menu,
	    1, 2, table_position, table_position + 1);

	gtk_object_set_data(GTK_OBJECT(main_vb), key, option_menu);
}

/* Create a font dialog for browsing. */
static void
font_browse_cb(GtkWidget *w, gpointer data)
{
	GtkWidget *caller = gtk_widget_get_toplevel(w);
	GtkWidget *font_browse_w;
	static gchar *fixedwidths[] = { "c", "m", NULL };

	/* Has a font dialog box already been opened for that top-level
	   widget? */
	font_browse_w = gtk_object_get_data(GTK_OBJECT(caller),
	    FONT_DIALOG_PTR_KEY);

	if (font_browse_w != NULL) {
		/* Yes.  Just re-activate that dialog box. */
		reactivate_window(font_browse_w);
		return;
	}

	/* Now create a new dialog. */
	font_browse_w = gtk_font_selection_dialog_new("Ethereal: Select Font");
	gtk_window_set_transient_for(GTK_WINDOW(font_browse_w),
	    GTK_WINDOW(top_level));

	/* Call a handler when we're destroyed, so we can inform
	   our caller, if any, that we've been destroyed. */
	gtk_signal_connect(GTK_OBJECT(font_browse_w), "destroy",
	    GTK_SIGNAL_FUNC(font_browse_destroy), NULL);

	/* Set its filter to show only fixed_width fonts. */
	gtk_font_selection_dialog_set_filter(
	    GTK_FONT_SELECTION_DIALOG(font_browse_w),
	    GTK_FONT_FILTER_BASE,	/* user can't change the filter */
	    GTK_FONT_ALL,		/* bitmap or scalable are fine */
	    NULL,			/* all foundries are OK */
	    NULL,			/* all weights are OK (XXX - normal only?) */
	    NULL,			/* all slants are OK (XXX - Roman only?) */
	    NULL,			/* all setwidths are OK */
	    fixedwidths,		/* ONLY fixed-width fonts */
	    NULL);			/* all charsets are OK (XXX - ISO 8859/1 only?) */

	/* Set the font to the current font.
	   XXX - GTK+ 1.2.8, and probably earlier versions, have a bug
	   wherein that doesn't necessarily cause that font to be
	   selected in the dialog box.  I've sent to the GTK+ folk
	   a fix; hopefully, it'll show up in 1.2.9 if, as, and when
	   they put out a 1.2.9 release. */
	gtk_font_selection_dialog_set_font_name(
	    GTK_FONT_SELECTION_DIALOG(font_browse_w), prefs.gui_font_name);

	/* Set the FONT_CALLER_PTR_KEY for the new dialog to point to
	   our caller. */
	gtk_object_set_data(GTK_OBJECT(font_browse_w), FONT_CALLER_PTR_KEY,
	    caller);

	/* Set the FONT_DIALOG_PTR_KEY for the caller to point to us */
	gtk_object_set_data(GTK_OBJECT(caller), FONT_DIALOG_PTR_KEY,
	    font_browse_w);
  
	/* Connect the ok_button to font_browse_ok_cb function and pass along a
	   pointer to the font selection box widget */
	gtk_signal_connect(
	    GTK_OBJECT(GTK_FONT_SELECTION_DIALOG(font_browse_w)->ok_button),
	    "clicked", (GtkSignalFunc)font_browse_ok_cb, font_browse_w);

	/* Connect the cancel_button to destroy the widget */
	gtk_signal_connect_object(
	    GTK_OBJECT(GTK_FONT_SELECTION_DIALOG(font_browse_w)->cancel_button),
	    "clicked", (GtkSignalFunc)gtk_widget_destroy,
	    GTK_OBJECT(font_browse_w));

	/* Catch the "key_press_event" signal in the window, so that we can
	   catch the ESC key being pressed and act as if the "Cancel" button
	   had been selected. */
	dlg_set_cancel(font_browse_w,
	    GTK_FONT_SELECTION_DIALOG(font_browse_w)->cancel_button);

	gtk_widget_show(font_browse_w);
}

static void
font_browse_ok_cb(GtkWidget *w, GtkFontSelectionDialog *fs)
{
	gchar *font_name, *bold_font_name;
	GdkFont *new_r_font, *new_b_font;

	font_name = g_strdup(gtk_font_selection_dialog_get_font_name(
	      GTK_FONT_SELECTION_DIALOG(fs)));

	/* Get the name that the boldface version of that font would have. */
	bold_font_name = boldify(font_name);

	/* Now load those fonts, just to make sure we can. */
	new_r_font = gdk_font_load(font_name);
	if (new_r_font == NULL) {
		/* Oops, that font didn't work.
		   Tell the user, but don't tear down the font selection
		   dialog, so that they can try again. */
		simple_dialog(ESD_TYPE_CRIT, NULL,
		   "The font you selected cannot be loaded.");

		g_free(font_name);
		g_free(bold_font_name);
		return;
	}

	new_b_font = gdk_font_load(bold_font_name);
	if (new_b_font == NULL) {
		/* Oops, that font didn't work.
		   Tell the user, but don't tear down the font selection
		   dialog, so that they can try again. */
		simple_dialog(ESD_TYPE_CRIT, NULL,
		   "The font you selected doesn't have a boldface version.");

		g_free(font_name);
		g_free(bold_font_name);
		gdk_font_unref(new_r_font);
		return;
	}

	font_changed = TRUE;
	new_font_name = font_name;

	gtk_widget_hide(GTK_WIDGET(fs));
	gtk_widget_destroy(GTK_WIDGET(fs));
}

static void
font_browse_destroy(GtkWidget *win, gpointer data)
{
	GtkWidget *caller;

	/* Get the widget that requested that we be popped up, if any.
	   (It should arrange to destroy us if it's destroyed, so
	   that we don't get a pointer to a non-existent window here.) */
	caller = gtk_object_get_data(GTK_OBJECT(win), FONT_CALLER_PTR_KEY);

	if (caller != NULL) {
		/* Tell it we no longer exist. */
		gtk_object_set_data(GTK_OBJECT(caller), FONT_DIALOG_PTR_KEY,
		    NULL);
	}

	/* Now nuke this window. */
	gtk_grab_remove(GTK_WIDGET(win));
	gtk_widget_destroy(GTK_WIDGET(win));
}

static gint
fetch_enum_value(gpointer control, const enum_val *enumvals)
{
	GtkWidget *label;
	char *label_string;

	/* Get the label for the currently active entry in the option menu.
	   Yes, this is how you do it.  See FAQ 6.8 in the GTK+ FAQ. */
	label = GTK_BIN(control)->child;

	/* Get the label string, and translate it to a value. */
	gtk_label_get(GTK_LABEL(label), &label_string);
	return find_val_for_string(label_string, enumvals, 1);
}

void
gui_prefs_fetch(GtkWidget *w)
{
	prefs.gui_scrollbar_on_right = fetch_enum_value(
	    gtk_object_get_data(GTK_OBJECT(w), SCROLLBAR_PLACEMENT_KEY),
	    scrollbar_placement_vals);
	prefs.gui_plist_sel_browse = fetch_enum_value(
	    gtk_object_get_data(GTK_OBJECT(w), PLIST_SEL_BROWSE_KEY),
	    selection_mode_vals);
	prefs.gui_ptree_sel_browse = fetch_enum_value(
	    gtk_object_get_data(GTK_OBJECT(w), PTREE_SEL_BROWSE_KEY),
	    selection_mode_vals);
	prefs.gui_ptree_line_style = fetch_enum_value(
	    gtk_object_get_data(GTK_OBJECT(w), PTREE_LINE_STYLE_KEY),
	    line_style_vals);
	prefs.gui_ptree_expander_style = fetch_enum_value(
	    gtk_object_get_data(GTK_OBJECT(w), PTREE_EXPANDER_STYLE_KEY),
	    expander_style_vals);
	prefs.gui_hex_dump_highlight_style = fetch_enum_value(
	    gtk_object_get_data(GTK_OBJECT(w), HEX_DUMP_HIGHLIGHT_STYLE_KEY),
	    highlight_style_vals);

	if (font_changed) {
		if (prefs.gui_font_name != NULL)
			g_free(prefs.gui_font_name);
		prefs.gui_font_name = g_strdup(new_font_name);
	}

	if (colors_changed)
	    fetch_colors();
}

void
gui_prefs_apply(GtkWidget *w)
{
	GdkFont *new_r_font, *new_b_font;
	char *bold_font_name;
	GdkFont *old_r_font = NULL, *old_b_font = NULL;

	if (font_changed) {
		/* XXX - what if the world changed out from under
		   us, so that one or both of these fonts cannot
		   be loaded? */
		new_r_font = gdk_font_load(prefs.gui_font_name);
		bold_font_name = boldify(prefs.gui_font_name);
		new_b_font = gdk_font_load(bold_font_name);
		set_plist_font(new_r_font);
		set_ptree_font_all(new_r_font);
		old_r_font = m_r_font;
		old_b_font = m_b_font;
		m_r_font = new_r_font;
		m_b_font = new_b_font;
		g_free(bold_font_name);
	}

	/* Redraw the hex dump windows, in case either the font or the
	   highlight style changed. */
	redraw_hex_dump_all();

	/* Redraw the help window. */
	help_redraw();

	/* Redraw the "Follow TCP Stream" windows, in case either the font
	   or the colors to use changed. */
	follow_redraw_all();

	set_scrollbar_placement_all(prefs.gui_scrollbar_on_right);
	set_plist_sel_browse(prefs.gui_plist_sel_browse);
	set_ptree_sel_browse_all(prefs.gui_ptree_sel_browse);
	set_ptree_line_style_all(prefs.gui_ptree_line_style);
	set_ptree_expander_style_all(prefs.gui_ptree_expander_style);
	if (colors_changed)
		update_marked_frames();

	/* We're no longer using the old fonts; unreference them. */
	if (old_r_font != NULL)
		gdk_font_unref(old_r_font);
	if (old_b_font != NULL)
		gdk_font_unref(old_b_font);
}

void
gui_prefs_destroy(GtkWidget *w)
{
	GtkWidget *caller = gtk_widget_get_toplevel(w);
	GtkWidget *fs;

	/* Is there a font selection dialog associated with this
	   Preferences dialog? */
	fs = gtk_object_get_data(GTK_OBJECT(caller), FONT_DIALOG_PTR_KEY);

	if (fs != NULL) {
		/* Yes.  Destroy it. */
		gtk_widget_destroy(fs);
	}

	/* Is there a color selection dialog associated with this
	   Preferences dialog? */
	fs = gtk_object_get_data(GTK_OBJECT(caller), COLOR_DIALOG_PTR_KEY);

	if (fs != NULL) {
		/* Yes.  Destroy it. */
		gtk_widget_destroy(fs);
	}

	/* Free up any saved font name. */
	if (new_font_name != NULL)
		g_free(new_font_name);
}

/* color selection part */

#define MAX_HANDLED_COL		2

typedef struct {
  GdkColor color;
  char    *label;
} color_info_t;

static color_info_t color_info[MAX_HANDLED_COL] = {
#define MFG_IDX			0
  { {0.0, 0.0, 0.0, 0.0},      	"Marked frame foreground" },
#define MBG_IDX			1
  { {0.0, 0.0, 0.0, 0.0},	"Marked frame background" }
};

#define SAMPLE_MARKED_TEXT	"Sample marked frame text\n"

#define CS_RED			0
#define CS_GREEN		1
#define CS_BLUE			2
#define CS_OPACITY		3

static GdkColor *curcolor = NULL;

static void
color_browse_cb(GtkWidget *w, gpointer data)
{

  GtkWidget *main_vb, *main_tb, *label, *optmenu, *menu, *menuitem;
  GtkWidget *sample, *colorsel, *bbox, *cancel_bt, *ok_bt, *color_w;
  int        width, height, i;
  gdouble    scolor[4]; 
  GtkWidget *caller = gtk_widget_get_toplevel(w);
 
  /* Has a color dialog box already been opened for that top-level
     widget? */
  color_w = gtk_object_get_data(GTK_OBJECT(caller),
				COLOR_DIALOG_PTR_KEY);

  if (color_w != NULL) {
    /* Yes.  Just re-activate that dialog box. */
    reactivate_window(color_w);
    return;
  }

  color_info[MFG_IDX].color = prefs.gui_marked_fg;
  color_info[MBG_IDX].color = prefs.gui_marked_bg;
  curcolor = &color_info[MFG_IDX].color;
  scolor[CS_RED]     = (gdouble) (curcolor->red)   / 65535.0;
  scolor[CS_GREEN]   = (gdouble) (curcolor->green) / 65535.0;
  scolor[CS_BLUE]    = (gdouble) (curcolor->blue)  / 65535.0;
  scolor[CS_OPACITY] = 1.0;

  /* Now create a new dialog.
     You can't put your own extra widgets into a color selection
     dialog, as you can with a file selection dialog, so we have to
     construct our own dialog and put a color selection widget
     into it. */
  color_w = dlg_window_new("Ethereal: Select Color");

  gtk_signal_connect(GTK_OBJECT(color_w), "delete_event",
    GTK_SIGNAL_FUNC(color_delete_cb), NULL);

  /* Call a handler when we're destroyed, so we can inform our caller,
     if any, that we've been destroyed. */
  gtk_signal_connect(GTK_OBJECT(color_w), "destroy",
		     GTK_SIGNAL_FUNC(color_destroy_cb), NULL);
  
  main_vb = gtk_vbox_new(FALSE, 5);
  gtk_container_border_width(GTK_CONTAINER(main_vb), 5);
  gtk_container_add (GTK_CONTAINER (color_w), main_vb);
  main_tb = gtk_table_new(3, 3, FALSE);
  gtk_box_pack_start(GTK_BOX(main_vb), main_tb, FALSE, FALSE, 0);
  gtk_table_set_row_spacings(GTK_TABLE(main_tb), 10);
  gtk_table_set_col_spacings(GTK_TABLE(main_tb), 15);
  gtk_widget_show(main_tb);
  label = gtk_label_new("Set:");
  gtk_misc_set_alignment(GTK_MISC(label), 1.0, 0.5);
  gtk_table_attach_defaults(GTK_TABLE(main_tb), label, 0, 1, 0, 1);
  gtk_widget_show(label);

  colorsel = gtk_color_selection_new();
  optmenu = gtk_option_menu_new();
  menu = gtk_menu_new();
  for (i = 0; i < MAX_HANDLED_COL; i++){
    menuitem = gtk_menu_item_new_with_label(color_info[i].label);
    gtk_object_set_data(GTK_OBJECT(menuitem), COLOR_SELECTION_PTR_KEY, 
			(gpointer) colorsel);
    gtk_signal_connect(GTK_OBJECT(menuitem), "activate",
		       GTK_SIGNAL_FUNC(update_current_color),
		       &color_info[i].color);
    gtk_widget_show(menuitem);
    gtk_menu_append(GTK_MENU (menu), menuitem);
  }
  gtk_option_menu_set_menu (GTK_OPTION_MENU (optmenu), menu);
  gtk_table_attach_defaults(GTK_TABLE(main_tb), optmenu, 1, 2, 0, 1);
  gtk_widget_show(optmenu);

  sample = gtk_text_new(FALSE, FALSE);
  height = sample->style->font->ascent + sample->style->font->descent;
  width = gdk_string_width(sample->style->font, SAMPLE_MARKED_TEXT);
  gtk_widget_set_usize(GTK_WIDGET(sample), width, height);
  gtk_text_set_editable(GTK_TEXT(sample), FALSE);
  gtk_text_insert(GTK_TEXT(sample), NULL, 
		  &color_info[MFG_IDX].color, 
		  &color_info[MBG_IDX].color,
		  SAMPLE_MARKED_TEXT, -1);
  gtk_table_attach_defaults(GTK_TABLE(main_tb), sample, 2, 3, 0, 2);
  gtk_widget_show(sample);
  gtk_color_selection_set_color(GTK_COLOR_SELECTION(colorsel), 
				&scolor[CS_RED]);
  gtk_table_attach_defaults(GTK_TABLE(main_tb), colorsel, 0, 3, 2, 3);
  gtk_object_set_data(GTK_OBJECT(colorsel), COLOR_SAMPLE_PTR_KEY,
		      (gpointer) sample);
  gtk_signal_connect(GTK_OBJECT(colorsel), "color-changed", 
		     GTK_SIGNAL_FUNC(update_text_color), NULL);
  gtk_widget_show(colorsel);
  gtk_widget_show(main_vb);

  gtk_object_set_data(GTK_OBJECT(color_w), COLOR_CALLER_PTR_KEY, caller);
  gtk_object_set_data(GTK_OBJECT(caller), COLOR_DIALOG_PTR_KEY, color_w);

  /* Ok, Cancel Buttons */  
  bbox = gtk_hbutton_box_new();
  gtk_button_box_set_layout(GTK_BUTTON_BOX(bbox), GTK_BUTTONBOX_END);
  gtk_button_box_set_spacing(GTK_BUTTON_BOX(bbox), 5);
  gtk_container_add(GTK_CONTAINER(main_vb), bbox);
  gtk_widget_show(bbox);

  ok_bt = gtk_button_new_with_label ("OK");
  gtk_signal_connect(GTK_OBJECT(ok_bt), "clicked",
		     GTK_SIGNAL_FUNC(color_ok_cb), color_w);
  GTK_WIDGET_SET_FLAGS(ok_bt, GTK_CAN_DEFAULT);
  gtk_box_pack_start(GTK_BOX (bbox), ok_bt, TRUE, TRUE, 0);
  gtk_widget_grab_default(ok_bt);
  gtk_widget_show(ok_bt);
  cancel_bt = gtk_button_new_with_label ("Cancel");
  gtk_signal_connect_object(GTK_OBJECT(cancel_bt), "clicked", 
			    (GtkSignalFunc)gtk_widget_destroy,
			    GTK_OBJECT(color_w));
  gtk_box_pack_start(GTK_BOX (bbox), cancel_bt, TRUE, TRUE, 0);
  gtk_widget_show(cancel_bt);
  dlg_set_cancel(color_w, cancel_bt);

  gtk_widget_show(color_w);
}

static void
update_text_color(GtkWidget *w, gpointer data) {
  GtkText  *sample = gtk_object_get_data(GTK_OBJECT(w), COLOR_SAMPLE_PTR_KEY);
  gdouble   scolor[4];

  gtk_color_selection_get_color(GTK_COLOR_SELECTION(w), &scolor[CS_RED]);
  
  curcolor->red   = (gushort) (scolor[CS_RED]   * 65535.0);
  curcolor->green = (gushort) (scolor[CS_GREEN] * 65535.0);
  curcolor->blue  = (gushort) (scolor[CS_BLUE]  * 65535.0);
  
  gtk_text_freeze(sample);
  gtk_text_set_point(sample, 0);
  gtk_text_forward_delete(sample, gtk_text_get_length(sample));
  gtk_text_insert(GTK_TEXT(sample), NULL, 
		  &color_info[MFG_IDX].color, 
		  &color_info[MBG_IDX].color,
		  SAMPLE_MARKED_TEXT, -1);
  gtk_text_thaw(sample);
}

static void
update_current_color(GtkWidget *w, gpointer data)
{
  GtkColorSelection *colorsel;    
  gdouble            scolor[4];

  colorsel = GTK_COLOR_SELECTION(gtk_object_get_data(GTK_OBJECT(w),
						     COLOR_SELECTION_PTR_KEY));
  curcolor = (GdkColor *)data;
  scolor[CS_RED]     = (gdouble) (curcolor->red)   / 65535.0;
  scolor[CS_GREEN]   = (gdouble) (curcolor->green) / 65535.0;
  scolor[CS_BLUE]    = (gdouble) (curcolor->blue)  / 65535.0;
  scolor[CS_OPACITY] = 1.0;
  
  gtk_color_selection_set_color(colorsel, &scolor[CS_RED]);
}

static void
color_ok_cb(GtkWidget *w, gpointer data)
{
  /* We assume the user actually changed a color here. */
  colors_changed = TRUE;

  gtk_widget_hide(GTK_WIDGET(data));
  gtk_widget_destroy(GTK_WIDGET(data));
}

static void
color_cancel_cb(GtkWidget *w, gpointer data)
{
  /* Revert the colors to the current preference settings. */
  color_info[MFG_IDX].color = prefs.gui_marked_fg;
  color_info[MBG_IDX].color = prefs.gui_marked_bg;
  gtk_widget_hide(GTK_WIDGET(data));
  gtk_widget_destroy(GTK_WIDGET(data));
}

/* Treat this as a cancel, by calling "color_cancel_cb()".
   XXX - that'll destroy the Select Color dialog; will that upset
   a higher-level handler that says "OK, we've been asked to delete
   this, so destroy it"? */
static gboolean
color_delete_cb(GtkWidget *prefs_w, gpointer dummy)
{
  color_cancel_cb(NULL, NULL);
  return FALSE;
}

static void
color_destroy_cb(GtkWidget *w, gpointer data)
{
  GtkWidget *caller = gtk_object_get_data(GTK_OBJECT(w), 
					  COLOR_CALLER_PTR_KEY);
  if (caller != NULL) {
    gtk_object_set_data(GTK_OBJECT(caller), COLOR_DIALOG_PTR_KEY, NULL);
  }
  gtk_grab_remove(GTK_WIDGET(w));
  gtk_widget_destroy(GTK_WIDGET(w));
}

static void
fetch_colors(void)
{
	prefs.gui_marked_fg = color_info[MFG_IDX].color;
	prefs.gui_marked_bg = color_info[MBG_IDX].color;
}