/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * widget-pixmap-combo.c - A pixmap selector combo box
 * Copyright 2000, 2001, Ximian, Inc.
 *
 * Authors:
 *   Jody Goldberg <jgoldberg@home.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License, version 2, as published by the Free Software Foundation.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#include <config.h>

#include <libintl.h>		/* This file uses raw gettext() but no _() */

#include <gtk/gtk.h>

#include "gal/util/e-util.h"

#include "gal-combo-box.h"
#include "widget-pixmap-combo.h"

#define PIXMAP_PREVIEW_WIDTH 15
#define PIXMAP_PREVIEW_HEIGHT 15

enum {
	CHANGED,
	LAST_SIGNAL
};

static guint pixmap_combo_signals [LAST_SIGNAL] = { 0, };

#define PARENT_TYPE GAL_COMBO_BOX_TYPE
static GtkObjectClass *pixmap_combo_parent_class;

/***************************************************************************/

static void
pixmap_combo_destroy (GtkObject *object)
{
	PixmapCombo *pc = PIXMAP_COMBO (object);

	if (pc->tool_tip)
		g_object_unref (pc->tool_tip);
	pc->tool_tip = NULL;
	
	(*pixmap_combo_parent_class->destroy) (object);
}

static void
pixmap_combo_class_init (GtkObjectClass *object_class)
{
	object_class->destroy = pixmap_combo_destroy;

	pixmap_combo_parent_class = g_type_class_ref (PARENT_TYPE);

	pixmap_combo_signals [CHANGED] =
		g_signal_new ("changed",
			      G_OBJECT_CLASS_TYPE (object_class),
			      G_SIGNAL_RUN_LAST,
			      G_STRUCT_OFFSET (PixmapComboClass, changed),
			      NULL, NULL,
			      e_marshal_NONE__INT,
			      G_TYPE_NONE, 1, G_TYPE_INT);
}

E_MAKE_TYPE (pixmap_combo,
	     "PixmapCombo",
	     PixmapCombo,
	     pixmap_combo_class_init,
	     NULL,
	     PARENT_TYPE)

static void
emit_change (GtkWidget *button, PixmapCombo *pc)
{
	g_return_if_fail (pc != NULL);
	g_return_if_fail (0 <= pc->last_index);
	g_return_if_fail (pc->last_index < pc->num_elements);

	g_signal_emit (pc, pixmap_combo_signals [CHANGED], 0,
		       pc->elements[pc->last_index].index);
}

static void
pixmap_clicked (GtkWidget *button, PixmapCombo *pc)
{
	int index = GPOINTER_TO_INT (gtk_object_get_user_data (GTK_OBJECT (button)));
	pixmap_combo_select_pixmap (pc, index);
	emit_change (button, pc);
	gal_combo_box_popup_hide (GAL_COMBO_BOX (pc));
}

static GtkWidget *
image_from_data (guint8 const *data)
{
	GdkPixbuf *pixbuf = gdk_pixbuf_new_from_inline (-1,  data, FALSE, NULL);
	GtkWidget *image = gtk_image_new_from_pixbuf (pixbuf);
	g_object_unref (pixbuf);
	return image;
}

static void
pixmap_table_setup (PixmapCombo *pc)
{
	int row, col, index = 0;

	pc->combo_table = gtk_table_new (pc->cols, pc->rows, 0);
	pc->tool_tip = gtk_tooltips_new ();
	g_object_ref (pc->tool_tip);
	gtk_object_sink (GTK_OBJECT (pc->tool_tip));

	for (row = 0; row < pc->rows; row++) {
		for (col = 0; col < pc->cols; ++col, ++index) {
			PixmapComboElement const *element = pc->elements + index;
			GtkWidget *button;

			if (element->inline_gdkpixbuf == NULL) {
				/* exit both loops */
				row = pc->rows;
				break;
			}

			button = gtk_button_new ();
			gtk_container_add (GTK_CONTAINER (button),
				image_from_data (element->inline_gdkpixbuf));
			gtk_button_set_relief (GTK_BUTTON (button),
				GTK_RELIEF_NONE);
			gtk_tooltips_set_tip (pc->tool_tip,
				button,
				gettext (element->untranslated_tooltip),
				"What goes here ??");

			gtk_table_attach (GTK_TABLE (pc->combo_table), button,
					  col, col+1, row+1, row+2, GTK_FILL, GTK_FILL, 1, 1);

			g_signal_connect (button, "clicked",
					  G_CALLBACK (pixmap_clicked), pc);
			gtk_object_set_user_data (GTK_OBJECT (button),
						  GINT_TO_POINTER (index));
		}
	}
	pc->num_elements = index;

	gtk_widget_show_all (pc->combo_table);
}

static void
pixmap_combo_construct (PixmapCombo *pc,
			PixmapComboElement const *elements, int ncols, int nrows)
{
	g_return_if_fail (pc != NULL);
	g_return_if_fail (IS_PIXMAP_COMBO (pc));

	/* Our table selector */
	pc->cols = ncols;
	pc->rows = nrows;
	pc->elements = elements;
	pixmap_table_setup (pc);

	pc->preview_button = gtk_button_new ();
	gtk_button_set_relief (GTK_BUTTON (pc->preview_button), GTK_RELIEF_NONE);

	pc->preview_pixmap = image_from_data (elements [0].inline_gdkpixbuf);

	gtk_container_add (GTK_CONTAINER (pc->preview_button), GTK_WIDGET (pc->preview_pixmap));
	gtk_widget_set_usize (GTK_WIDGET (pc->preview_pixmap), 24, 24);
	g_signal_connect (pc->preview_button, "clicked",
			  G_CALLBACK (emit_change), pc);

	gtk_widget_show_all (pc->preview_button);

	gal_combo_box_construct (GAL_COMBO_BOX (pc),
				 pc->preview_button,
				 pc->combo_table);
}

GtkWidget *
pixmap_combo_new (PixmapComboElement const *elements, int ncols, int nrows)
{
	PixmapCombo *pc;

	g_return_val_if_fail (elements != NULL, NULL);
	g_return_val_if_fail (elements != NULL, NULL);
	g_return_val_if_fail (ncols > 0, NULL);
	g_return_val_if_fail (nrows > 0, NULL);

	pc = g_object_new (PIXMAP_COMBO_TYPE, NULL);

	pixmap_combo_construct (pc, elements, ncols, nrows);

	return GTK_WIDGET (pc);
}

void
pixmap_combo_select_pixmap (PixmapCombo *pc, int index)
{
	g_return_if_fail (pc != NULL);
	g_return_if_fail (IS_PIXMAP_COMBO (pc));
	g_return_if_fail (0 <= index);
	g_return_if_fail (index < pc->num_elements);

	pc->last_index = index;

	gtk_container_remove (
		GTK_CONTAINER (pc->preview_button),
		pc->preview_pixmap);

	pc->preview_pixmap = image_from_data (
		pc->elements [index].inline_gdkpixbuf);
	gtk_widget_show (pc->preview_pixmap);
	
	gtk_container_add (
		GTK_CONTAINER (pc->preview_button), pc->preview_pixmap);
}