path: root/src/ephy-notebook.c

/*
 *  Copyright (C) 2002 Christophe Fergeau
 *  Copyright (C) 2003, 2004 Marco Pesenti Gritti
 *  Copyright (C) 2003, 2004 Christian Persch
 *
 *  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, 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.
 *
 *  $Id$
 */

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

#include "ephy-notebook.h"
#include "eel-gconf-extensions.h"
#include "ephy-prefs.h"
#include "ephy-marshal.h"
#include "ephy-file-helpers.h"
#include "ephy-dnd.h"
#include "ephy-embed.h"
#include "ephy-window.h"
#include "ephy-shell.h"
#include "ephy-debug.h"
#include "ephy-favicon-cache.h"
#include "ephy-ellipsizing-label.h"
#include "ephy-spinner.h"

#include <glib-object.h>
#include <gtk/gtkeventbox.h>
#include <gtk/gtknotebook.h>
#include <gtk/gtkhbox.h>
#include <gtk/gtklabel.h>
#include <gtk/gtkwidget.h>
#include <gtk/gtktooltips.h>
#include <gtk/gtkmain.h>
#include <gtk/gtkstock.h>
#include <gtk/gtkimage.h>
#include <gtk/gtkbutton.h>
#include <gtk/gtkiconfactory.h>
#include <glib/gi18n.h>
#include <libgnomevfs/gnome-vfs-uri.h>

#define TAB_WIDTH_N_CHARS 20

#define AFTER_ALL_TABS -1
#define NOT_IN_APP_WINDOWS -2

#define EPHY_NOTEBOOK_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_NOTEBOOK, EphyNotebookPrivate))

struct EphyNotebookPrivate
{
    GList *focused_pages;
    GtkTooltips *title_tips;
    guint tabs_vis_notifier_id;
    gulong motion_notify_handler_id;
    gint x_start, y_start;
    gboolean drag_in_progress;
    gboolean show_tabs;
};

static void ephy_notebook_init           (EphyNotebook *notebook);
static void ephy_notebook_class_init     (EphyNotebookClass *klass);
static void ephy_notebook_finalize       (GObject *object);
static void move_tab_to_another_notebook (EphyNotebook *src,
                              EphyNotebook *dest,
                      int dest_position);

/* Local variables */
static GdkCursor *cursor = NULL;

static GtkTargetEntry url_drag_types [] = 
{
        { EPHY_DND_URI_LIST_TYPE,   0, 0 },
        { EPHY_DND_URL_TYPE,        0, 1 }
};
static guint n_url_drag_types = G_N_ELEMENTS (url_drag_types);

enum
{
    TAB_ADDED,
    TAB_REMOVED,
    TABS_REORDERED,
    TAB_DETACHED,
    TAB_DELETE,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };

static GObjectClass *parent_class = NULL;

GType
ephy_notebook_get_type (void)
{
        static GType ephy_notebook_type = 0;

        if (ephy_notebook_type == 0)
        {
                static const GTypeInfo our_info =
            {
                sizeof (EphyNotebookClass),
                NULL, /* base_init */
                NULL, /* base_finalize */
                (GClassInitFunc) ephy_notebook_class_init,
                NULL,
                NULL, /* class_data */
                sizeof (EphyNotebook),
                0, /* n_preallocs */
                (GInstanceInitFunc) ephy_notebook_init
            };

                ephy_notebook_type = g_type_register_static (GTK_TYPE_NOTEBOOK,
                                 "EphyNotebook",
                                 &our_info, 0);
        }

        return ephy_notebook_type;
}

static void
ephy_notebook_class_init (EphyNotebookClass *klass)
{
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    parent_class = g_type_class_peek_parent (klass);

    object_class->finalize = ephy_notebook_finalize;

    signals[TAB_ADDED] =
        g_signal_new ("tab_added",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_FIRST,
                  G_STRUCT_OFFSET (EphyNotebookClass, tab_added),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__OBJECT,
                  G_TYPE_NONE,
                  1,
                  EPHY_TYPE_TAB);
    signals[TAB_REMOVED] =
        g_signal_new ("tab_removed",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_FIRST,
                  G_STRUCT_OFFSET (EphyNotebookClass, tab_removed),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__OBJECT,
                  G_TYPE_NONE,
                  1,
                  EPHY_TYPE_TAB);
    signals[TAB_DETACHED] =
        g_signal_new ("tab_detached",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_FIRST,
                  G_STRUCT_OFFSET (EphyNotebookClass, tab_detached),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__OBJECT,
                  G_TYPE_NONE,
                  1,
                  EPHY_TYPE_TAB);
    signals[TABS_REORDERED] =
        g_signal_new ("tabs_reordered",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_FIRST,
                  G_STRUCT_OFFSET (EphyNotebookClass, tabs_reordered),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE,
                  0);
    signals[TAB_DELETE] =
        g_signal_new ("tab_delete",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EphyNotebookClass, tab_delete),
                  g_signal_accumulator_true_handled, NULL,
                  ephy_marshal_BOOLEAN__OBJECT,
                  G_TYPE_BOOLEAN,
                  1,
                  EPHY_TYPE_TAB);

    g_type_class_add_private (object_class, sizeof(EphyNotebookPrivate));
}

static gboolean
is_in_notebook_window (EphyNotebook *notebook,
               gint abs_x, gint abs_y)
{
    gint x, y;
    gint rel_x, rel_y;
    gint width, height;
    GtkWidget *toplevel = gtk_widget_get_toplevel (GTK_WIDGET(notebook));
    GdkWindow *window = GTK_WIDGET(toplevel)->window;

    gdk_window_get_origin (window, &x, &y);
    rel_x = abs_x - x;
    rel_y = abs_y - y;

    x = GTK_WIDGET(notebook)->allocation.x;
    y = GTK_WIDGET(notebook)->allocation.y;
    height = GTK_WIDGET(notebook)->allocation.height;
    width  = GTK_WIDGET(notebook)->allocation.width;
    return ((rel_x>=x) && (rel_y>=y) && (rel_x<=x+width) && (rel_y<=y+height));
}

static EphyNotebook *
find_notebook_at_pointer (gint abs_x, gint abs_y)
{
    GdkWindow *win_at_pointer, *toplevel_win;
    gpointer toplevel = NULL;
    gint x, y;

    win_at_pointer = gdk_window_at_pointer (&x, &y);
    if (win_at_pointer == NULL)
    {
        /* We are outside all windows containing a notebook */
        return NULL;
    }

    toplevel_win = gdk_window_get_toplevel (win_at_pointer);

    /* get the GtkWidget which owns the toplevel GdkWindow */
    gdk_window_get_user_data (toplevel_win, &toplevel);

    /* toplevel should be an EphyWindow */
    if (toplevel != NULL && EPHY_IS_WINDOW (toplevel))
    {
        EphyNotebook *notebook;

        notebook = EPHY_NOTEBOOK (ephy_window_get_notebook
                        (EPHY_WINDOW (toplevel)));

        if (is_in_notebook_window (notebook, abs_x, abs_y))
        {
            return notebook;
        }
    }

    return NULL;
}

static gint
find_tab_num_at_pos (EphyNotebook *notebook, gint abs_x, gint abs_y)
{
    GtkPositionType tab_pos;
    int page_num = 0;
    GtkNotebook *nb = GTK_NOTEBOOK (notebook);
    GtkWidget *page;

    tab_pos = gtk_notebook_get_tab_pos (GTK_NOTEBOOK (notebook));

    if (GTK_NOTEBOOK (notebook)->first_tab == NULL)
    {
        return AFTER_ALL_TABS;
    }

    /* For some reason unfullscreen + quick click can
       cause a wrong click event to be reported to the tab */
    if (!is_in_notebook_window(notebook, abs_x, abs_y))
    {
        return NOT_IN_APP_WINDOWS;
    }

    while ((page = gtk_notebook_get_nth_page (nb, page_num)))
    {
        GtkWidget *tab;
        gint max_x, max_y;
        gint x_root, y_root;

        tab = gtk_notebook_get_tab_label (nb, page);
        g_return_val_if_fail (tab != NULL, -1);

        if (!GTK_WIDGET_MAPPED (GTK_WIDGET (tab)))
        {
            page_num++;
            continue;
        }

        gdk_window_get_origin (GDK_WINDOW (tab->window),
                       &x_root, &y_root);

        max_x = x_root + tab->allocation.x + tab->allocation.width;
        max_y = y_root + tab->allocation.y + tab->allocation.height;

        if (((tab_pos == GTK_POS_TOP)
             || (tab_pos == GTK_POS_BOTTOM))
            &&(abs_x<=max_x))
        {
            return page_num;
        }
        else if (((tab_pos == GTK_POS_LEFT)
              || (tab_pos == GTK_POS_RIGHT))
             && (abs_y<=max_y))
        {
            return page_num;
        }

        page_num++;
    }
    return AFTER_ALL_TABS;
}

static gint find_notebook_and_tab_at_pos (gint abs_x, gint abs_y,
                      EphyNotebook **notebook,
                      gint *page_num)
{
    *notebook = find_notebook_at_pointer (abs_x, abs_y);
    if (*notebook == NULL)
    {
        return NOT_IN_APP_WINDOWS;
    }
    *page_num = find_tab_num_at_pos (*notebook, abs_x, abs_y);

    if (*page_num < 0)
    {
        return *page_num;
    }
    else
    {
        return 0;
    }
}

void
ephy_notebook_move_tab (EphyNotebook *src,
            EphyNotebook *dest,
            EphyTab *tab,
            int dest_position)
{
    if (dest == NULL || src == dest)
    {
        gtk_notebook_reorder_child
            (GTK_NOTEBOOK (src), GTK_WIDGET (tab), dest_position);
        
        if (src->priv->drag_in_progress == FALSE)
        {
            g_signal_emit (G_OBJECT (src), signals[TABS_REORDERED], 0);
        }
    }
    else
    {
        /* make sure the tab isn't destroyed while we move it */
        g_object_ref (tab);
        ephy_notebook_remove_tab (src, tab);
        ephy_notebook_add_tab (dest, tab, dest_position, TRUE);
        g_object_unref (tab);
    }
}

static void
drag_start (EphyNotebook *notebook)
{
    notebook->priv->drag_in_progress = TRUE;

    /* get a new cursor, if necessary */
    if (!cursor) cursor = gdk_cursor_new (GDK_FLEUR);

    /* grab the pointer */
    gtk_grab_add (GTK_WIDGET (notebook));
    if (!gdk_pointer_is_grabbed ()) {
        gdk_pointer_grab (GDK_WINDOW(GTK_WIDGET (notebook)->window),
                  FALSE,
                  GDK_BUTTON1_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
                  NULL, cursor, GDK_CURRENT_TIME);
    }
}

static void
drag_stop (EphyNotebook *notebook)
{
    if (notebook->priv->drag_in_progress)
    {
        g_signal_emit (G_OBJECT (notebook), signals[TABS_REORDERED], 0);
    }

    notebook->priv->drag_in_progress = FALSE;
    if (notebook->priv->motion_notify_handler_id != 0)
    {
        g_signal_handler_disconnect (G_OBJECT (notebook),
                         notebook->priv->motion_notify_handler_id);
        notebook->priv->motion_notify_handler_id = 0;
    }
}

/* this function is only called during dnd, we don't need to emit TABS_REORDERED
 * here, instead we do it on drag_stop
 */
static void
move_tab (EphyNotebook *notebook,
      int dest_position)
{
    gint cur_page_num;

    cur_page_num = gtk_notebook_get_current_page (GTK_NOTEBOOK (notebook));

    if (dest_position != cur_page_num)
    {
        GtkWidget *cur_tab;
        
        cur_tab = gtk_notebook_get_nth_page (GTK_NOTEBOOK (notebook),
                             cur_page_num);
        ephy_notebook_move_tab (EPHY_NOTEBOOK (notebook), NULL,
                    EPHY_TAB (cur_tab),
                    dest_position);
    }
}

static gboolean
motion_notify_cb (EphyNotebook *notebook,
          GdkEventMotion *event,
          gpointer data)
{
    EphyNotebook *dest;
    gint page_num;
    gint result;

    if (notebook->priv->drag_in_progress == FALSE)
    {
        if (gtk_drag_check_threshold (GTK_WIDGET (notebook),
                          notebook->priv->x_start,
                          notebook->priv->y_start,
                          event->x_root, event->y_root))
        {
            drag_start (notebook);
        }
        else
        {
            return FALSE;
        }
    }

    result = find_notebook_and_tab_at_pos ((gint)event->x_root,
                           (gint)event->y_root,
                           &dest, &page_num);

    if (result != NOT_IN_APP_WINDOWS)
    {
        if (dest != notebook)
        {
            move_tab_to_another_notebook (notebook, dest,
                              page_num);
        }
        else
        {
            g_assert (page_num >= -1);
            move_tab (notebook, page_num);
        }
    }

    return FALSE;
}

static void
move_tab_to_another_notebook (EphyNotebook *src,
                  EphyNotebook *dest,
                  int dest_position)
{
    EphyTab *tab;
    int cur_page;

    /* This is getting tricky, the tab was dragged in a notebook
     * in another window of the same app, we move the tab
     * to that new notebook, and let this notebook handle the
     * drag
    */
    g_assert (EPHY_IS_NOTEBOOK (dest));
    g_assert (dest != src);

    cur_page = gtk_notebook_get_current_page (GTK_NOTEBOOK (src));
    tab = EPHY_TAB (gtk_notebook_get_nth_page (GTK_NOTEBOOK (src), cur_page));

    /* stop drag in origin window */
    drag_stop (src);
    gtk_grab_remove (GTK_WIDGET (src));

    ephy_notebook_move_tab (src, dest, tab, dest_position);

    /* start drag handling in dest notebook */
    drag_start (dest);

    dest->priv->motion_notify_handler_id =
        g_signal_connect (G_OBJECT (dest),
                  "motion-notify-event",
                  G_CALLBACK (motion_notify_cb),
                  NULL);
}

static gboolean
button_release_cb (EphyNotebook *notebook,
           GdkEventButton *event,
           gpointer data)
{
    if (notebook->priv->drag_in_progress)
    {
        gint cur_page_num;
        GtkWidget *cur_page;

        cur_page_num =
            gtk_notebook_get_current_page (GTK_NOTEBOOK (notebook));
        cur_page = gtk_notebook_get_nth_page (GTK_NOTEBOOK (notebook),
                              cur_page_num);

        if (!is_in_notebook_window (notebook, event->x_root, event->y_root)
            && gtk_notebook_get_n_pages (GTK_NOTEBOOK (notebook)) > 1)
        {
            /* Tab was detached */
            g_signal_emit (G_OBJECT (notebook),
                       signals[TAB_DETACHED], 0, cur_page);
        }

        /* ungrab the pointer if it's grabbed */
        if (gdk_pointer_is_grabbed ())
        {
            gdk_pointer_ungrab (GDK_CURRENT_TIME);
            gtk_grab_remove (GTK_WIDGET (notebook));
        }
    }
    /* This must be called even if a drag isn't happening */
    drag_stop (notebook);
    return FALSE;
}

static gboolean
button_press_cb (EphyNotebook *notebook,
         GdkEventButton *event,
         gpointer data)
{
    gint tab_clicked = find_tab_num_at_pos (notebook,
                        event->x_root,
                        event->y_root);

    if (notebook->priv->drag_in_progress)
    {
        return TRUE;
    }

    if ((event->button == 1) && (event->type == GDK_BUTTON_PRESS)
        && (tab_clicked >= 0))
    {
        notebook->priv->x_start = event->x_root;
        notebook->priv->y_start = event->y_root;
        notebook->priv->motion_notify_handler_id =
            g_signal_connect (G_OBJECT (notebook),
                      "motion-notify-event",
                      G_CALLBACK (motion_notify_cb), NULL);
    }

    return FALSE;
}

GtkWidget *
ephy_notebook_new (void)
{
    return GTK_WIDGET (g_object_new (EPHY_TYPE_NOTEBOOK, NULL));
}

static void
ephy_notebook_switch_page_cb (GtkNotebook *notebook,
                              GtkNotebookPage *page,
                              guint page_num,
                              gpointer data)
{
    EphyNotebook *nb = EPHY_NOTEBOOK (notebook);
    GtkWidget *child;

    child = gtk_notebook_get_nth_page (notebook, page_num);

    /* Remove the old page, we dont want to grow unnecessarily
     * the list */
    if (nb->priv->focused_pages)
    {
        nb->priv->focused_pages =
            g_list_remove (nb->priv->focused_pages, child);
    }

    nb->priv->focused_pages = g_list_append (nb->priv->focused_pages,
                         child);
}

static void
notebook_drag_data_received_cb (GtkWidget* widget, GdkDragContext *context,
                gint x, gint y, GtkSelectionData *selection_data,
                guint info, guint time, EphyTab *tab)
{
    GList *uri_list = NULL;
    GnomeVFSURI *uri;
    gchar **tmp;

    g_signal_stop_emission_by_name (widget, "drag_data_received");

    if (eel_gconf_get_boolean (CONF_LOCKDOWN_DISABLE_ARBITRARY_URL)) return;

    if (selection_data->length <= 0 || selection_data->data == NULL) return;

    if (selection_data->target == gdk_atom_intern (EPHY_DND_URL_TYPE, FALSE))
    {
        /* URL_TYPE has format: url \n title */
        tmp = g_strsplit (selection_data->data, "\n", 2);
        if (tmp)
        {
            uri = gnome_vfs_uri_new (tmp[0]);
            if (uri)
            {
                uri_list = g_list_append (uri_list, uri);
            }
            g_strfreev (tmp);
        }
    }
    else if (selection_data->target == gdk_atom_intern (EPHY_DND_URI_LIST_TYPE, FALSE))
    {
        uri_list = gnome_vfs_uri_list_parse (selection_data->data);
    }
    else
    {
        g_assert_not_reached ();
    }

    if (uri_list)
    {
        EphyWindow *window;

        window = EPHY_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (widget)));

        ephy_window_load_in_tabs (window, tab, uri_list);
        gnome_vfs_uri_list_free (uri_list);
    }
}

/*
 * update_tabs_visibility: Hide tabs if there is only one tab
 * and the pref is not set.
 */
static void
update_tabs_visibility (EphyNotebook *nb, gboolean before_inserting)
{
    gboolean show_tabs;
    guint num;

    num = gtk_notebook_get_n_pages (GTK_NOTEBOOK (nb));

    if (before_inserting) num++;

    show_tabs = (eel_gconf_get_boolean (CONF_ALWAYS_SHOW_TABS_BAR) || num > 1) &&
            nb->priv->show_tabs == TRUE;

    gtk_notebook_set_show_tabs (GTK_NOTEBOOK (nb), show_tabs);
}

static void
tabs_visibility_notifier (GConfClient *client,
              guint cnxn_id,
              GConfEntry *entry,
              EphyNotebook *nb)
{
    update_tabs_visibility (nb, FALSE);
}

static void
ephy_notebook_init (EphyNotebook *notebook)
{
    notebook->priv = EPHY_NOTEBOOK_GET_PRIVATE (notebook);

    gtk_notebook_set_scrollable (GTK_NOTEBOOK (notebook), TRUE);
    gtk_notebook_set_show_border (GTK_NOTEBOOK (notebook), FALSE);
    gtk_notebook_set_show_tabs (GTK_NOTEBOOK (notebook), FALSE);

    notebook->priv->title_tips = gtk_tooltips_new ();
    g_object_ref (G_OBJECT (notebook->priv->title_tips));
    gtk_object_sink (GTK_OBJECT (notebook->priv->title_tips));

    notebook->priv->drag_in_progress = FALSE;
    notebook->priv->motion_notify_handler_id = 0;
    notebook->priv->focused_pages = NULL;
    notebook->priv->show_tabs = TRUE;

    g_signal_connect (notebook, "button-press-event",
              (GCallback)button_press_cb, NULL);
    g_signal_connect (notebook, "button-release-event",
              (GCallback)button_release_cb, NULL);
    gtk_widget_add_events (GTK_WIDGET (notebook), GDK_BUTTON1_MOTION_MASK);

    g_signal_connect_after (G_OBJECT (notebook), "switch_page",
                                G_CALLBACK (ephy_notebook_switch_page_cb),
                                NULL);

    /* Set up drag-and-drop target */
    g_signal_connect (G_OBJECT(notebook), "drag_data_received",
              G_CALLBACK(notebook_drag_data_received_cb),
              NULL);
        gtk_drag_dest_set (GTK_WIDGET(notebook), GTK_DEST_DEFAULT_MOTION |
               GTK_DEST_DEFAULT_DROP,
                           url_drag_types,n_url_drag_types,
                           GDK_ACTION_MOVE | GDK_ACTION_COPY);

    notebook->priv->tabs_vis_notifier_id = eel_gconf_notification_add
        (CONF_ALWAYS_SHOW_TABS_BAR,
         (GConfClientNotifyFunc)tabs_visibility_notifier, notebook);
}

static void
ephy_notebook_finalize (GObject *object)
{
    EphyNotebook *notebook = EPHY_NOTEBOOK (object);

    eel_gconf_notification_remove (notebook->priv->tabs_vis_notifier_id);

    if (notebook->priv->focused_pages)
    {
        g_list_free (notebook->priv->focused_pages);
    }
    g_object_unref (notebook->priv->title_tips);

    LOG ("EphyNotebook finalised %p", object)

    G_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
sync_load_status (EphyTab *tab, GParamSpec *pspec, GtkWidget *proxy)
{
    GtkWidget *spinner, *icon;

    spinner = GTK_WIDGET (g_object_get_data (G_OBJECT (proxy), "spinner"));
    icon = GTK_WIDGET (g_object_get_data (G_OBJECT (proxy), "icon"));
    g_return_if_fail (spinner != NULL && icon != NULL);

    if (ephy_tab_get_load_status (tab))
    {
        gtk_widget_hide (icon);
        gtk_widget_show (spinner);
        ephy_spinner_start (EPHY_SPINNER (spinner));
    }
    else
    {
        ephy_spinner_stop (EPHY_SPINNER (spinner));
        gtk_widget_hide (spinner);
        gtk_widget_show (icon);
    }
}

static void
sync_icon (EphyTab *tab, GParamSpec *pspec, GtkWidget *proxy)
{
    EphyFaviconCache *cache;
    GdkPixbuf *pixbuf = NULL;
    GtkImage *icon = NULL;
    const char *address;

    cache = EPHY_FAVICON_CACHE
        (ephy_embed_shell_get_favicon_cache (EPHY_EMBED_SHELL (ephy_shell)));
    address = ephy_tab_get_icon_address (tab);

    if (address)
    {
        pixbuf = ephy_favicon_cache_get (cache, address);
    }

    icon = GTK_IMAGE (g_object_get_data (G_OBJECT (proxy), "icon"));
    if (icon)
    {
        gtk_image_set_from_pixbuf (icon, pixbuf);
    }

    if (pixbuf)
    {
        g_object_unref (pixbuf);
    }
}

static void
sync_label (EphyTab *tab, GParamSpec *pspec, GtkWidget *proxy)
{
    GtkWidget *label, *ebox;
    GtkTooltips *tips;  
    const char *title;

    ebox = GTK_WIDGET (g_object_get_data (G_OBJECT (proxy), "label-ebox"));
    tips = GTK_TOOLTIPS (g_object_get_data (G_OBJECT (proxy), "tooltips"));
    label = GTK_WIDGET (g_object_get_data (G_OBJECT (proxy), "label"));

    g_return_if_fail (ebox != NULL && tips != NULL && label != NULL);

    title = ephy_tab_get_title (tab);

    if (title)
    {
        ephy_ellipsizing_label_set_text (EPHY_ELLIPSIZING_LABEL (label), title);
        gtk_tooltips_set_tip (tips, ebox, title, NULL);
    }
}

static void
close_button_clicked_cb (GtkWidget *widget, GtkWidget *tab)
{
    EphyNotebook *notebook;
    gboolean inhibited = FALSE;

    notebook = EPHY_NOTEBOOK (gtk_widget_get_parent (tab));
    g_signal_emit (G_OBJECT (notebook), signals[TAB_DELETE], 0, tab, &inhibited);

    if (inhibited == FALSE)
    {
        ephy_notebook_remove_tab (notebook, EPHY_TAB (tab));
    }
}

static void
tab_label_style_set_cb (GtkWidget *label,
            GtkStyle *previous_style,
            GtkWidget *hbox)
{
    PangoFontMetrics *metrics;
    PangoContext *context;
    int char_width, h, w;

    context = gtk_widget_get_pango_context (label);
    metrics = pango_context_get_metrics (context,
                                 label->style->font_desc,
                         pango_context_get_language (context));

    char_width = pango_font_metrics_get_approximate_char_width (metrics);
    pango_font_metrics_unref (metrics);

    LOG ("tab_label_size_request_cb label %p char_width %d total %d",
         label, char_width, TAB_WIDTH_N_CHARS * PANGO_PIXELS (char_width))

    gtk_icon_size_lookup (GTK_ICON_SIZE_MENU, &w, &h);

    gtk_widget_set_size_request
        (hbox, TAB_WIDTH_N_CHARS * PANGO_PIXELS(char_width) + 2 * w, -1);
}

static GtkWidget *
build_tab_label (EphyNotebook *nb, EphyTab *tab)
{
    GtkWidget *window, *hbox, *label_hbox, *label_ebox;
    GtkWidget *label, *close_button, *image, *spinner, *icon;
    int h = -1, w = -1;

    window = gtk_widget_get_toplevel (GTK_WIDGET (nb));

    gtk_icon_size_lookup (GTK_ICON_SIZE_MENU, &w, &h);

    /* 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 close button */
    close_button = gtk_button_new ();
    gtk_button_set_relief (GTK_BUTTON (close_button),
                   GTK_RELIEF_NONE);
    image = gtk_image_new_from_stock (GTK_STOCK_CLOSE,
                      GTK_ICON_SIZE_MENU);
    gtk_widget_set_size_request (close_button, w, h);
    gtk_container_add (GTK_CONTAINER (close_button), image);
    gtk_box_pack_start (GTK_BOX (hbox), close_button, FALSE, FALSE, 0);

    g_signal_connect (G_OBJECT (close_button), "clicked",
                          G_CALLBACK (close_button_clicked_cb),
                          tab);

    /* setup load feedback */
    spinner = ephy_spinner_new ();
    ephy_spinner_set_size (EPHY_SPINNER (spinner), GTK_ICON_SIZE_MENU);
    gtk_box_pack_start (GTK_BOX (label_hbox), spinner, FALSE, FALSE, 0);

    /* setup site icon, empty by default */
    icon = gtk_image_new ();
    gtk_box_pack_start (GTK_BOX (label_hbox), icon, FALSE, FALSE, 0);

    /* setup label */
        label = ephy_ellipsizing_label_new ("");
    ephy_ellipsizing_label_set_mode (EPHY_ELLIPSIZING_LABEL (label),
                     EPHY_ELLIPSIZE_START);
    gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
        gtk_misc_set_padding (GTK_MISC (label), 0, 0);
    gtk_box_pack_start (GTK_BOX (label_hbox), label, TRUE, TRUE, 0);

    /* Set minimal size */
    g_signal_connect (label, "style-set",
              G_CALLBACK (tab_label_style_set_cb), hbox);

    gtk_widget_show (hbox);
    gtk_widget_show (label_ebox);
    gtk_widget_show (label_hbox);
    gtk_widget_show (label);
    gtk_widget_show (image);
    gtk_widget_show (close_button);
    
    g_object_set_data (G_OBJECT (hbox), "label", label);
    g_object_set_data (G_OBJECT (hbox), "label-ebox", label_ebox);
    g_object_set_data (G_OBJECT (hbox), "spinner", spinner);
    g_object_set_data (G_OBJECT (hbox), "icon", icon);
    g_object_set_data (G_OBJECT (hbox), "close-button", close_button);
    g_object_set_data (G_OBJECT (hbox), "tooltips", nb->priv->title_tips);

    return hbox;
}

void
ephy_notebook_set_show_tabs (EphyNotebook *nb, gboolean show_tabs)
{
    nb->priv->show_tabs = show_tabs;

    update_tabs_visibility (nb, FALSE);
}

void
ephy_notebook_add_tab (EphyNotebook *nb,
               EphyTab *tab,
               int position,
               gboolean jump_to)
{
    GtkWidget *label;

    g_return_if_fail (EPHY_IS_TAB (tab));

    label = build_tab_label (nb, tab);

    update_tabs_visibility (nb, TRUE);

    gtk_notebook_insert_page (GTK_NOTEBOOK (nb), GTK_WIDGET (tab),
                  label, position);

    /* Set up drag-and-drop target */
    g_signal_connect (G_OBJECT(label), "drag_data_received",
              G_CALLBACK(notebook_drag_data_received_cb), tab);
    gtk_drag_dest_set (label, GTK_DEST_DEFAULT_ALL,
               url_drag_types,n_url_drag_types,
               GDK_ACTION_MOVE | GDK_ACTION_COPY);

    sync_icon (tab, NULL, label);
    sync_label (tab, NULL, label);
    sync_load_status (tab, NULL, label);

    g_signal_connect_object (tab, "notify::icon",
                     G_CALLBACK (sync_icon), label, 0);
    g_signal_connect_object (tab, "notify::title",
                     G_CALLBACK (sync_label), label, 0);
    g_signal_connect_object (tab, "notify::load-status",
                 G_CALLBACK (sync_load_status), label, 0);

    g_signal_emit (G_OBJECT (nb), signals[TAB_ADDED], 0, tab);

    if (jump_to)
    {
        gtk_notebook_set_current_page (GTK_NOTEBOOK (nb),
                           position);
        g_object_set_data (G_OBJECT (tab), "jump_to",
                   GINT_TO_POINTER (jump_to));
    }
}

static void
smart_tab_switching_on_closure (EphyNotebook *nb,
                EphyTab *tab)
{
    gboolean jump_to;

    jump_to = GPOINTER_TO_INT (g_object_get_data
                   (G_OBJECT (tab), "jump_to"));

    if (!jump_to || !nb->priv->focused_pages)
    {
        gtk_notebook_next_page (GTK_NOTEBOOK (nb));
    }
    else
    {
        GList *l;
        GtkWidget *child;
        int page_num;

        /* activate the last focused tab */
        l = g_list_last (nb->priv->focused_pages);
        child = GTK_WIDGET (l->data);
        page_num = gtk_notebook_page_num (GTK_NOTEBOOK (nb),
                          child);
        gtk_notebook_set_current_page
            (GTK_NOTEBOOK (nb), page_num);
    }
}

void
ephy_notebook_remove_tab (EphyNotebook *nb,
              EphyTab *tab)
{
    int num, position, curr;
    GtkWidget *label, *ebox;

    g_return_if_fail (EPHY_IS_NOTEBOOK (nb));
    g_return_if_fail (EPHY_IS_TAB (tab));

    num = gtk_notebook_get_n_pages (GTK_NOTEBOOK (nb));
    if (num <= 1)
    {
        GtkWidget *window;
        window = gtk_widget_get_toplevel (GTK_WIDGET (nb));

        g_signal_emit (G_OBJECT (nb), signals[TAB_REMOVED], 0, tab);
        gtk_widget_destroy (window);
        return;
    }

    /* Remove the page from the focused pages list */
    nb->priv->focused_pages =  g_list_remove (nb->priv->focused_pages,
                          tab);

    position = gtk_notebook_page_num (GTK_NOTEBOOK (nb), GTK_WIDGET (tab));
    curr = gtk_notebook_get_current_page (GTK_NOTEBOOK (nb));

    if (position == curr)
    {
        smart_tab_switching_on_closure (nb, tab);
    }

    label = gtk_notebook_get_tab_label (GTK_NOTEBOOK (nb), GTK_WIDGET (tab));
    ebox = GTK_WIDGET (g_object_get_data (G_OBJECT (label), "label-ebox"));
    gtk_tooltips_set_tip (GTK_TOOLTIPS (nb->priv->title_tips), ebox, NULL, NULL);

    g_signal_handlers_disconnect_by_func (tab,
                          G_CALLBACK (sync_icon), label);
    g_signal_handlers_disconnect_by_func (tab,
                          G_CALLBACK (sync_label), label);
    g_signal_handlers_disconnect_by_func (tab,
                          G_CALLBACK (sync_load_status), label);

    /**
     * we ref the tab so that it's still alive while the tabs_removed
     * signal is processed.
     */
    g_object_ref (tab);

    gtk_notebook_remove_page (GTK_NOTEBOOK (nb), position);

    update_tabs_visibility (nb, FALSE);

    g_signal_emit (G_OBJECT (nb), signals[TAB_REMOVED], 0, tab);

    g_object_unref (tab);
}