/*
 * pluma-panel.c
 * This file is part of pluma
 *
 * Copyright (C) 2005 - Paolo Maggi 
 *
 * 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., 51 Franklin St, Fifth Floor, 
 * Boston, MA 02110-1301, USA.
 */
 
/*
 * Modified by the pluma Team, 2005. See the AUTHORS file for a 
 * list of people on the pluma Team.  
 * See the ChangeLog files for a list of changes.
 *
 * $Id$
 */

#include "pluma-panel.h"

#include <glib/gi18n.h>
#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <gdk/gdkkeysyms.h>

#include "pluma-close-button.h"
#include "pluma-window.h"
#include "pluma-debug.h"

#define PANEL_ITEM_KEY "PlumaPanelItemKey"

#define PLUMA_PANEL_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), PLUMA_TYPE_PANEL, PlumaPanelPrivate))

#if GTK_CHECK_VERSION (3, 0, 0)
#define gtk_hbox_new(X,Y) gtk_box_new(GTK_ORIENTATION_HORIZONTAL,Y)
#define gtk_vbox_new(X,Y) gtk_box_new(GTK_ORIENTATION_VERTICAL,Y)
#endif

struct _PlumaPanelPrivate 
{
	GtkOrientation orientation;
	
	/* Title bar (vertical panel only) */
	GtkWidget *title_image;
	GtkWidget *title_label;

	/* Notebook */
	GtkWidget *notebook;
};

typedef struct _PlumaPanelItem PlumaPanelItem;

struct _PlumaPanelItem 
{
	gchar *name;
	GtkWidget *icon;
};

/* Properties */
enum {
	PROP_0,
	PROP_ORIENTATION
};

/* Signals */
enum {
	ITEM_ADDED,
	ITEM_REMOVED,
	CLOSE,
	FOCUS_DOCUMENT,
	LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };

static GObject	*pluma_panel_constructor	(GType type,
						 guint n_construct_properties,
						 GObjectConstructParam *construct_properties);


#if GTK_CHECK_VERSION (3, 0, 0)
G_DEFINE_TYPE(PlumaPanel, pluma_panel, GTK_TYPE_BOX)
#else
G_DEFINE_TYPE(PlumaPanel, pluma_panel, GTK_TYPE_VBOX)
#endif

static void
pluma_panel_finalize (GObject *obj)
{
	if (G_OBJECT_CLASS (pluma_panel_parent_class)->finalize)
		(*G_OBJECT_CLASS (pluma_panel_parent_class)->finalize) (obj);
}

static void
pluma_panel_get_property (GObject    *object,
			  guint       prop_id,
			  GValue     *value,
			  GParamSpec *pspec)
{
	PlumaPanel *panel = PLUMA_PANEL (object);
	
	switch (prop_id)
	{
		case PROP_ORIENTATION:
			g_value_set_enum(value, panel->priv->orientation);
			break;
		default:
			G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
			break;
	}
}

static void
pluma_panel_set_property (GObject      *object,
			  guint         prop_id,
			  const GValue *value,
			  GParamSpec   *pspec)
{
	PlumaPanel *panel = PLUMA_PANEL (object);

	switch (prop_id)
	{
		case PROP_ORIENTATION:
			panel->priv->orientation = g_value_get_enum (value);
			break;
		default:
			G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
			break;
	}
}

static void
pluma_panel_close (PlumaPanel *panel)
{
	gtk_widget_hide (GTK_WIDGET (panel));
}

static void
pluma_panel_focus_document (PlumaPanel *panel)
{
	GtkWidget *toplevel = gtk_widget_get_toplevel (GTK_WIDGET (panel));
	if (gtk_widget_is_toplevel (toplevel) && PLUMA_IS_WINDOW (toplevel))
	{
		PlumaView *view;

		view = pluma_window_get_active_view (PLUMA_WINDOW (toplevel));
		if (view != NULL)
			gtk_widget_grab_focus (GTK_WIDGET (view));
	}
}

static void
pluma_panel_grab_focus (GtkWidget *w)
{
	gint n;
	GtkWidget *tab;
	PlumaPanel *panel = PLUMA_PANEL (w);

	n = gtk_notebook_get_current_page (GTK_NOTEBOOK (panel->priv->notebook));
	if (n == -1)
		return;

	tab = gtk_notebook_get_nth_page (GTK_NOTEBOOK (panel->priv->notebook),
					 n);
	g_return_if_fail (tab != NULL);

	gtk_widget_grab_focus (tab);
}

static void
pluma_panel_class_init (PlumaPanelClass *klass)
{
	GtkBindingSet *binding_set;
	GObjectClass *object_class = G_OBJECT_CLASS (klass);
	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);

	g_type_class_add_private (klass, sizeof (PlumaPanelPrivate));

	object_class->constructor = pluma_panel_constructor;
	object_class->finalize = pluma_panel_finalize;
	object_class->get_property = pluma_panel_get_property;
	object_class->set_property = pluma_panel_set_property;

	g_object_class_install_property (object_class,
					 PROP_ORIENTATION,
#if GTK_CHECK_VERSION (3, 0, 0)
					 g_param_spec_enum ("panel-orientation",
							    "Panel Orientation",
#else
					 g_param_spec_enum ("orientation",
							    "Orientation",
#endif
							    "The panel's orientation",
							    GTK_TYPE_ORIENTATION,
							    GTK_ORIENTATION_VERTICAL,
							    G_PARAM_WRITABLE |
							    G_PARAM_READABLE |
							    G_PARAM_CONSTRUCT_ONLY |
							    G_PARAM_STATIC_STRINGS));

	widget_class->grab_focus = pluma_panel_grab_focus;

	klass->close = pluma_panel_close;
	klass->focus_document = pluma_panel_focus_document;

	signals[ITEM_ADDED] =
		g_signal_new ("item_added",
			      G_OBJECT_CLASS_TYPE (klass),
			      G_SIGNAL_RUN_FIRST,
			      G_STRUCT_OFFSET (PlumaPanelClass, item_added),
			      NULL, NULL,
			      g_cclosure_marshal_VOID__OBJECT,
			      G_TYPE_NONE,
			      1,
			      GTK_TYPE_WIDGET);
	signals[ITEM_REMOVED] =
		g_signal_new ("item_removed",
			      G_OBJECT_CLASS_TYPE (klass),
			      G_SIGNAL_RUN_FIRST,
			      G_STRUCT_OFFSET (PlumaPanelClass, item_removed),
			      NULL, NULL,
			      g_cclosure_marshal_VOID__OBJECT,
			      G_TYPE_NONE,
			      1,
			      GTK_TYPE_WIDGET);

	/* Keybinding signals */
	signals[CLOSE] =
		g_signal_new ("close",
			      G_OBJECT_CLASS_TYPE (klass),
			      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
			      G_STRUCT_OFFSET (PlumaPanelClass, close),
		  	      NULL, NULL,
		  	      g_cclosure_marshal_VOID__VOID,
			      G_TYPE_NONE, 0);
	signals[FOCUS_DOCUMENT] =
		g_signal_new ("focus_document",
			      G_OBJECT_CLASS_TYPE (klass),
			      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
			      G_STRUCT_OFFSET (PlumaPanelClass, focus_document),
		  	      NULL, NULL,
		  	      g_cclosure_marshal_VOID__VOID,
			      G_TYPE_NONE, 0);					
	binding_set = gtk_binding_set_by_class (klass);

	gtk_binding_entry_add_signal (binding_set,
				      GDK_KEY_Escape,
				      0,
				      "close",
				      0);
	gtk_binding_entry_add_signal (binding_set,
				      GDK_KEY_Return,
				      GDK_CONTROL_MASK,
				      "focus_document",
				      0);
}

/* This is ugly, since it supports only known
 * storage types of GtkImage, otherwise fall back
 * to the empty icon.
 * See http://bugzilla.gnome.org/show_bug.cgi?id=317520.
 */
static void
set_gtk_image_from_gtk_image (GtkImage *image,
			      GtkImage *source)
{
	switch (gtk_image_get_storage_type (source))
	{
	case GTK_IMAGE_EMPTY:
		gtk_image_clear (image);
		break;
#if !GTK_CHECK_VERSION (3, 0, 0)
	case GTK_IMAGE_PIXMAP:
		{
			GdkPixmap *pm;
			GdkBitmap *bm;

			gtk_image_get_pixmap (source, &pm, &bm);
			gtk_image_set_from_pixmap (image, pm, bm);
		}
		break;
	case GTK_IMAGE_IMAGE:
		{
			GdkImage *i;
			GdkBitmap *bm;

			gtk_image_get_image (source, &i, &bm);
			gtk_image_set_from_image (image, i, bm);
		}
		break;
#endif
	case GTK_IMAGE_PIXBUF:
		{
			GdkPixbuf *pb;

			pb = gtk_image_get_pixbuf (source);
			gtk_image_set_from_pixbuf (image, pb);
		}
		break;
	case GTK_IMAGE_STOCK:
		{
			gchar *s_id;
			GtkIconSize s;

			gtk_image_get_stock (source, &s_id, &s);
			gtk_image_set_from_stock (image, s_id, s);
		}
		break;
	case GTK_IMAGE_ICON_SET:
		{
			GtkIconSet *is;
			GtkIconSize s;

			gtk_image_get_icon_set (source, &is, &s);
			gtk_image_set_from_icon_set (image, is, s);
		}
		break;
	case GTK_IMAGE_ANIMATION:
		{
			GdkPixbufAnimation *a;

			a = gtk_image_get_animation (source);
			gtk_image_set_from_animation (image, a);
		}
		break;
	case GTK_IMAGE_ICON_NAME:
		{
			const gchar *n;
			GtkIconSize s;

			gtk_image_get_icon_name (source, &n, &s);
			gtk_image_set_from_icon_name (image, n, s);
		}
		break;
	default:
		gtk_image_set_from_stock (image,
					  GTK_STOCK_FILE,
					  GTK_ICON_SIZE_MENU);
	}
}

static void
sync_title (PlumaPanel     *panel,
	    PlumaPanelItem *item)
{
	if (panel->priv->orientation != GTK_ORIENTATION_VERTICAL)
		return;

	if (item != NULL)
	{
		gtk_label_set_text (GTK_LABEL (panel->priv->title_label), 
				    item->name);

		set_gtk_image_from_gtk_image (GTK_IMAGE (panel->priv->title_image),
					      GTK_IMAGE (item->icon));
	}
	else
	{
		gtk_label_set_text (GTK_LABEL (panel->priv->title_label), 
				    _("Empty"));

		gtk_image_set_from_stock (GTK_IMAGE (panel->priv->title_image),
					  GTK_STOCK_FILE,
					  GTK_ICON_SIZE_MENU);
	}
}

static void
notebook_page_changed (GtkNotebook     *notebook,
                       GtkWidget       *page,
                       guint            page_num,
                       PlumaPanel      *panel)
{
	GtkWidget *item;
	PlumaPanelItem *data;

	item = gtk_notebook_get_nth_page (notebook, page_num);
	g_return_if_fail (item != NULL);

	data = (PlumaPanelItem *)g_object_get_data (G_OBJECT (item),
						    PANEL_ITEM_KEY);
	g_return_if_fail (data != NULL);

	sync_title (panel, data);
}

static void
panel_show (PlumaPanel *panel,
	    gpointer    user_data)
{
	gint page;
	GtkNotebook *nb;

	nb = GTK_NOTEBOOK (panel->priv->notebook);

	page = gtk_notebook_get_current_page (nb);

	if (page != -1)
		notebook_page_changed (nb, NULL, page, panel);
}

static void
pluma_panel_init (PlumaPanel *panel)
{
	panel->priv = PLUMA_PANEL_GET_PRIVATE (panel);

#if GTK_CHECK_VERSION (3, 0, 0)
	gtk_orientable_set_orientation (GTK_ORIENTABLE (panel),
									GTK_ORIENTATION_VERTICAL);
#endif
}

static void
close_button_clicked_cb (GtkWidget *widget,
			 GtkWidget *panel)
{
	gtk_widget_hide (panel);
}

static GtkWidget *
create_close_button (PlumaPanel *panel)
{
	GtkWidget *button;

	button = pluma_close_button_new ();

	gtk_widget_set_tooltip_text (button, _("Hide panel"));

	g_signal_connect (button,
			  "clicked",
			  G_CALLBACK (close_button_clicked_cb),
			  panel);

	return button;
}

static void
build_notebook_for_panel (PlumaPanel *panel)
{
	/* Create the panel notebook */
	panel->priv->notebook = gtk_notebook_new ();

	gtk_notebook_set_tab_pos (GTK_NOTEBOOK (panel->priv->notebook),
				  GTK_POS_BOTTOM);
	gtk_notebook_set_scrollable (GTK_NOTEBOOK (panel->priv->notebook),
				     TRUE);
	gtk_notebook_popup_enable (GTK_NOTEBOOK (panel->priv->notebook));

	gtk_widget_show (GTK_WIDGET (panel->priv->notebook));

	g_signal_connect (panel->priv->notebook,
			  "switch-page",
			  G_CALLBACK (notebook_page_changed),
			  panel);
}

static void
build_horizontal_panel (PlumaPanel *panel)
{
	GtkWidget *box;
	GtkWidget *sidebar;
	GtkWidget *close_button;

	box = gtk_hbox_new(FALSE, 0);

	gtk_box_pack_start (GTK_BOX (box), 
			    panel->priv->notebook, 
			    TRUE, 
			    TRUE, 
			    0);

	/* Toolbar, close button and first separator */
	sidebar = gtk_vbox_new(FALSE, 6);
	gtk_container_set_border_width (GTK_CONTAINER (sidebar), 4);

	gtk_box_pack_start (GTK_BOX (box),
			    sidebar,
			    FALSE, 
			    FALSE, 
			    0);

	close_button = create_close_button (panel);

	gtk_box_pack_start (GTK_BOX (sidebar),
			    close_button,
			    FALSE, 
			    FALSE, 
			    0);

	gtk_widget_show_all (box);

	gtk_box_pack_start (GTK_BOX (panel),
			    box,
			    TRUE,
			    TRUE,
			    0);
}

static void
build_vertical_panel (PlumaPanel *panel)
{
	GtkWidget *close_button;
	GtkWidget *title_hbox;
	GtkWidget *icon_name_hbox;
	GtkWidget *dummy_label;

	/* Create title hbox */
	title_hbox = gtk_hbox_new (FALSE, 6);
	gtk_container_set_border_width (GTK_CONTAINER (title_hbox), 5);
					
	gtk_box_pack_start (GTK_BOX (panel), title_hbox, FALSE, FALSE, 0);
	
	icon_name_hbox = gtk_hbox_new (FALSE, 0);
	gtk_box_pack_start (GTK_BOX (title_hbox), 
			    icon_name_hbox, 
			    TRUE, 
			    TRUE, 
			    0);
		
	panel->priv->title_image = 
				gtk_image_new_from_stock (GTK_STOCK_FILE,
							  GTK_ICON_SIZE_MENU);
	gtk_box_pack_start (GTK_BOX (icon_name_hbox), 
			    panel->priv->title_image, 
			    FALSE, 
			    TRUE, 
			    0);

	dummy_label = gtk_label_new (" ");

	gtk_box_pack_start (GTK_BOX (icon_name_hbox), 
			    dummy_label, 
			    FALSE, 
			    FALSE, 
			    0);	

	panel->priv->title_label = gtk_label_new (_("Empty"));
#if GTK_CHECK_VERSION (3, 16, 0)
	gtk_label_set_xalign (GTK_LABEL (panel->priv->title_label), 0.0);
#else
	gtk_misc_set_alignment (GTK_MISC (panel->priv->title_label), 0, 0.5);
#endif
	gtk_label_set_ellipsize(GTK_LABEL (panel->priv->title_label), PANGO_ELLIPSIZE_END);

	gtk_box_pack_start (GTK_BOX (icon_name_hbox),
			    panel->priv->title_label,
			    TRUE,
			    TRUE,
			    0);

	close_button = create_close_button (panel);

	gtk_box_pack_start (GTK_BOX (title_hbox),
			    close_button, 
			    FALSE, 
			    FALSE, 
			    0);

	gtk_widget_show_all (title_hbox);

	gtk_box_pack_start (GTK_BOX (panel),
			    panel->priv->notebook,
			    TRUE,
			    TRUE,
			    0);
}

static GObject *
pluma_panel_constructor (GType type,
			 guint n_construct_properties,
			 GObjectConstructParam *construct_properties)
{
	
	/* Invoke parent constructor. */
	PlumaPanelClass *klass = PLUMA_PANEL_CLASS (g_type_class_peek (PLUMA_TYPE_PANEL));
	GObjectClass *parent_class = G_OBJECT_CLASS (g_type_class_peek_parent (klass));
	GObject *obj = parent_class->constructor (type,
						  n_construct_properties,
						  construct_properties);

	/* Build the panel, now that we know the orientation 
			   (_init has been called previously) */
	PlumaPanel *panel = PLUMA_PANEL (obj);

	build_notebook_for_panel (panel);
  	if (panel->priv->orientation == GTK_ORIENTATION_HORIZONTAL)
  		build_horizontal_panel (panel);
	else
		build_vertical_panel (panel);

	g_signal_connect (panel,
			  "show",
			  G_CALLBACK (panel_show),
			  NULL);

	return obj;
}

/**
 * pluma_panel_new:
 * @orientation: a #GtkOrientation
 *
 * Creates a new #PlumaPanel with the given @orientation. You shouldn't create
 * a new panel use pluma_window_get_side_panel() or pluma_window_get_bottom_panel()
 * instead.
 *
 * Returns: a new #PlumaPanel object.
 */
GtkWidget *
pluma_panel_new (GtkOrientation orientation)
{
	return GTK_WIDGET (g_object_new (PLUMA_TYPE_PANEL, "orientation", orientation, NULL));
}

static GtkWidget *
build_tab_label (PlumaPanel  *panel,
		 GtkWidget   *item,
		 const gchar *name,
		 GtkWidget   *icon)
{
	GtkWidget *hbox, *label_hbox, *label_ebox;
	GtkWidget *label;

	/* set hbox spacing and label padding (see below) so that there's an
	 * equal amount of space around the label */
	hbox = gtk_hbox_new (FALSE, 4);

	label_ebox = gtk_event_box_new ();
	gtk_event_box_set_visible_window (GTK_EVENT_BOX (label_ebox), FALSE);
	gtk_box_pack_start (GTK_BOX (hbox), label_ebox, TRUE, TRUE, 0);

	label_hbox = gtk_hbox_new (FALSE, 4);
	gtk_container_add (GTK_CONTAINER (label_ebox), label_hbox);

	/* setup icon */
	gtk_box_pack_start (GTK_BOX (label_hbox), icon, FALSE, FALSE, 0);

	/* setup label */
        label = gtk_label_new (name);
#if GTK_CHECK_VERSION (3, 16, 0)
	gtk_label_set_xalign (GTK_LABEL (label), 0.0);
#else
	gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
#endif
#if GTK_CHECK_VERSION (3, 0, 0)
	gtk_widget_set_margin_start (label, 0);
	gtk_widget_set_margin_end (label, 0);
	gtk_widget_set_margin_top (label, 0);
	gtk_widget_set_margin_bottom (label, 0);
#else
	gtk_misc_set_padding (GTK_MISC (label), 0, 0);
#endif
	gtk_box_pack_start (GTK_BOX (label_hbox), label, TRUE, TRUE, 0);

	gtk_widget_set_tooltip_text (label_ebox, name);

	gtk_widget_show_all (hbox);

	if (panel->priv->orientation == GTK_ORIENTATION_VERTICAL)
		gtk_widget_hide(label);

	g_object_set_data (G_OBJECT (item), "label", label);
	g_object_set_data (G_OBJECT (item), "hbox", hbox);

	return hbox;
}

/**
 * pluma_panel_add_item:
 * @panel: a #PlumaPanel
 * @item: the #GtkWidget to add to the @panel
 * @name: the name to be shown in the @panel
 * @image: the image to be shown in the @panel
 *
 * Adds a new item to the @panel.
 */
void
pluma_panel_add_item (PlumaPanel  *panel, 
		      GtkWidget   *item, 
		      const gchar *name,
		      GtkWidget   *image)
{
	PlumaPanelItem *data;
	GtkWidget *tab_label;
	GtkWidget *menu_label;
	gint w, h;
	
	g_return_if_fail (PLUMA_IS_PANEL (panel));
	g_return_if_fail (GTK_IS_WIDGET (item));
	g_return_if_fail (name != NULL);
	g_return_if_fail (image == NULL || GTK_IS_IMAGE (image));

	data = g_new (PlumaPanelItem, 1);

	data->name = g_strdup (name);

	if (image == NULL)
	{
		/* default to empty */
		data->icon = gtk_image_new_from_stock (GTK_STOCK_FILE,
						       GTK_ICON_SIZE_MENU);
	}
	else
	{
		data->icon = image;
	}

	gtk_icon_size_lookup (GTK_ICON_SIZE_MENU, &w, &h);
	gtk_widget_set_size_request (data->icon, w, h);
	
	g_object_set_data (G_OBJECT (item),
		           PANEL_ITEM_KEY,
		           data);

	tab_label = build_tab_label (panel, item, data->name, data->icon);

	menu_label = gtk_label_new (name);
#if GTK_CHECK_VERSION (3, 16, 0)
	gtk_label_set_xalign (GTK_LABEL (menu_label), 0.0);
#else
	gtk_misc_set_alignment (GTK_MISC (menu_label), 0.0, 0.5);
#endif

	if (!gtk_widget_get_visible (item))
		gtk_widget_show (item);

	gtk_notebook_append_page_menu (GTK_NOTEBOOK (panel->priv->notebook),
				       item,
				       tab_label,
				       menu_label);

	g_signal_emit (G_OBJECT (panel), signals[ITEM_ADDED], 0, item);
}

/**
 * pluma_panel_add_item_with_stock_icon:
 * @panel: a #PlumaPanel
 * @item: the #GtkWidget to add to the @panel
 * @name: the name to be shown in the @panel
 * @stock_id: a stock id
 *
 * Same as pluma_panel_add_item() but using an image from stock.
 */
void
pluma_panel_add_item_with_stock_icon (PlumaPanel  *panel, 
				      GtkWidget   *item, 
				      const gchar *name,
				      const gchar *stock_id)
{
	GtkWidget *icon = NULL;

	if (stock_id != NULL)
	{
		icon = gtk_image_new_from_stock (stock_id,
						 GTK_ICON_SIZE_MENU);
	}

	pluma_panel_add_item (panel, item, name, icon);
}

/**
 * pluma_panel_remove_item:
 * @panel: a #PlumaPanel
 * @item: the item to be removed from the panel
 *
 * Removes the widget @item from the panel if it is in the @panel and returns
 * %TRUE if there was not any problem.
 *
 * Returns: %TRUE if it was well removed.
 */
gboolean
pluma_panel_remove_item (PlumaPanel *panel,
			 GtkWidget  *item)
{
	PlumaPanelItem *data;
	gint page_num;
	
	g_return_val_if_fail (PLUMA_IS_PANEL (panel), FALSE);
	g_return_val_if_fail (GTK_IS_WIDGET (item), FALSE);

	page_num = gtk_notebook_page_num (GTK_NOTEBOOK (panel->priv->notebook),
					  item);
					  
	if (page_num == -1)
		return FALSE;
		
	data = (PlumaPanelItem *)g_object_get_data (G_OBJECT (item),
					            PANEL_ITEM_KEY);
	g_return_val_if_fail (data != NULL, FALSE);
	
	g_free (data->name);
	g_free (data);

	g_object_set_data (G_OBJECT (item),
		           PANEL_ITEM_KEY,
		           NULL);

	/* ref the item to keep it alive during signal emission */
	g_object_ref (G_OBJECT (item));

	gtk_notebook_remove_page (GTK_NOTEBOOK (panel->priv->notebook), 
				  page_num);

	/* if we removed all the pages, reset the title */
	if (gtk_notebook_get_n_pages (GTK_NOTEBOOK (panel->priv->notebook)) == 0)
		sync_title (panel, NULL);

	g_signal_emit (G_OBJECT (panel), signals[ITEM_REMOVED], 0, item);

	g_object_unref (G_OBJECT (item));

	return TRUE;
}

/**
 * pluma_panel_activate_item:
 * @panel: a #PlumaPanel
 * @item: the item to be activated
 *
 * Switches to the page that contains @item.
 *
 * Returns: %TRUE if it was activated
 */
gboolean
pluma_panel_activate_item (PlumaPanel *panel,
			   GtkWidget  *item)
{
	gint page_num;

	g_return_val_if_fail (PLUMA_IS_PANEL (panel), FALSE);
	g_return_val_if_fail (GTK_IS_WIDGET (item), FALSE);

	page_num = gtk_notebook_page_num (GTK_NOTEBOOK (panel->priv->notebook),
					  item);

	if (page_num == -1)
		return FALSE;

	gtk_notebook_set_current_page (GTK_NOTEBOOK (panel->priv->notebook),
				       page_num);

	return TRUE;
}

/**
 * pluma_panel_item_is_active:
 * @panel: a #PlumaPanel
 * @item: a #GtkWidget
 *
 * Returns whether @item is the active widget in @panel
 *
 * Returns: %TRUE if @item is the active widget
 */
gboolean
pluma_panel_item_is_active (PlumaPanel *panel,
			    GtkWidget  *item)
{
	gint cur_page;
	gint page_num;

	g_return_val_if_fail (PLUMA_IS_PANEL (panel), FALSE);
	g_return_val_if_fail (GTK_IS_WIDGET (item), FALSE);

	page_num = gtk_notebook_page_num (GTK_NOTEBOOK (panel->priv->notebook),
					  item);

	if (page_num == -1)
		return FALSE;

	cur_page = gtk_notebook_get_current_page (
				GTK_NOTEBOOK (panel->priv->notebook));

	return (page_num == cur_page);
}

/**
 * pluma_panel_get_orientation:
 * @panel: a #PlumaPanel
 *
 * Gets the orientation of the @panel. 
 *
 * Returns: the #GtkOrientation of #PlumaPanel
 */
GtkOrientation
pluma_panel_get_orientation (PlumaPanel *panel)
{
	g_return_val_if_fail (PLUMA_IS_PANEL (panel), GTK_ORIENTATION_VERTICAL);

	return panel->priv->orientation;
}

/**
 * pluma_panel_get_n_items:
 * @panel: a #PlumaPanel
 *
 * Gets the number of items in a @panel.
 * 
 * Returns: the number of items contained in #PlumaPanel
 */
gint
pluma_panel_get_n_items (PlumaPanel *panel)
{
	g_return_val_if_fail (PLUMA_IS_PANEL (panel), -1);

	return gtk_notebook_get_n_pages (GTK_NOTEBOOK (panel->priv->notebook));
}

gint
_pluma_panel_get_active_item_id (PlumaPanel *panel)
{
	gint cur_page;
	GtkWidget *item;
	PlumaPanelItem *data;

	g_return_val_if_fail (PLUMA_IS_PANEL (panel), 0);

	cur_page = gtk_notebook_get_current_page (
				GTK_NOTEBOOK (panel->priv->notebook));
	if (cur_page == -1)
		return 0;

	item = gtk_notebook_get_nth_page (
				GTK_NOTEBOOK (panel->priv->notebook),
				cur_page);

	/* FIXME: for now we use as the hash of the name as id.
	 * However the name is not guaranteed to be unique and
	 * it is a translated string, so it's subotimal, but should
	 * be good enough for now since we don't want to add an
	 * ad hoc id argument.
	 */

	data = (PlumaPanelItem *)g_object_get_data (G_OBJECT (item),
					            PANEL_ITEM_KEY);
	g_return_val_if_fail (data != NULL, 0);

	return g_str_hash (data->name);
}

void
_pluma_panel_set_active_item_by_id (PlumaPanel *panel,
				    gint        id)
{
	gint n, i;

	g_return_if_fail (PLUMA_IS_PANEL (panel));

	if (id == 0)
		return;

	n = gtk_notebook_get_n_pages (
				GTK_NOTEBOOK (panel->priv->notebook));

	for (i = 0; i < n; i++)
	{
		GtkWidget *item;
		PlumaPanelItem *data;

		item = gtk_notebook_get_nth_page (
				GTK_NOTEBOOK (panel->priv->notebook), i);

		data = (PlumaPanelItem *)g_object_get_data (G_OBJECT (item),
						            PANEL_ITEM_KEY);
		g_return_if_fail (data != NULL);

		if (g_str_hash (data->name) == id)
		{
			gtk_notebook_set_current_page (
				GTK_NOTEBOOK (panel->priv->notebook), i);

			return;
		}
	}
}
