path: root/src/ephy-notebook.c

/*
 *  Copyright (C) 2002 Christophe Fergeau
 *  Copyright (C) 2003, 2004 Marco Pesenti Gritti
 *  Copyright (C) 2003, 2004, 2005 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.
 *
 *  $Id$
 */

#include "config.h"

#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-spinner.h"
#include "ephy-link.h"
#include "ephy-debug.h"

#include <glib/gi18n.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>

#define TAB_WIDTH_N_CHARS 15

#define AFTER_ALL_TABS -1
#define NOT_IN_APP_WINDOWS -2

#define INSANE_NUMBER_OF_URLS 20

/* Until https://bugzilla.mozilla.org/show_bug.cgi?id=296002 is fixed */
#define KEEP_TAB_IN_SAME_TOPLEVEL

#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;
    gulong grab_notify_handler_id;
    gulong toplevel_grab_broken_handler_id;
    gulong toplevel_motion_notify_handler_id;
    gulong toplevel_button_release_handler_id;
    int x_start;
    int y_start;

    guint drag_in_progress : 1;
    guint show_tabs : 1;
    guint dnd_enabled : 1;
};

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,
                      GdkEventMotion *event,
                      int dest_position);
static void move_tab             (EphyNotebook *notebook,
                      int dest_position);

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

static const GtkTargetEntry url_drag_types [] = 
{
    { EPHY_DND_URI_LIST_TYPE,   0, 0 },
    { EPHY_DND_URL_TYPE,        0, 1 }
};

enum
{
    PROP_0,
    PROP_DND_ENABLED,
    PROP_SHOW_TABS
};

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

static guint signals[LAST_SIGNAL] = { 0 };

static GObjectClass *parent_class = NULL;

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

    if (G_UNLIKELY (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
            };

        static const GInterfaceInfo link_info =
        {
            NULL,
            NULL,
            NULL
        };

    type = g_type_register_static (GTK_TYPE_NOTEBOOK,
                       "EphyNotebook",
                       &our_info, 0);
    g_type_add_interface_static (type,
                     EPHY_TYPE_LINK,
                     &link_info);
    }

    return type;
}

void
ephy_notebook_set_dnd_enabled (EphyNotebook *notebook,
                   gboolean enabled)
{
    EphyNotebookPrivate *priv = notebook->priv;

    priv->dnd_enabled = enabled;
    /* FIXME abort any DNDs in progress */

    g_object_notify (G_OBJECT (notebook), "dnd-enabled");
}

static void
ephy_notebook_get_property (GObject *object,
                guint prop_id,
                GValue *value,
                GParamSpec *pspec)
{
    EphyNotebook *notebook = EPHY_NOTEBOOK (object);
    EphyNotebookPrivate *priv = notebook->priv;

    switch (prop_id)
    {
        case PROP_DND_ENABLED:
            g_value_set_boolean (value, priv->dnd_enabled);
            break;
        case PROP_SHOW_TABS:
            g_value_set_boolean (value, priv->show_tabs);
            break;
    }
}

static void
ephy_notebook_set_property (GObject *object,
                guint prop_id,
                const GValue *value,
                GParamSpec *pspec)
{
    EphyNotebook *notebook = EPHY_NOTEBOOK (object);

    switch (prop_id)
    {
        case PROP_DND_ENABLED:
            ephy_notebook_set_dnd_enabled (notebook, g_value_get_boolean (value));
            break;
        case PROP_SHOW_TABS:
            ephy_notebook_set_show_tabs (notebook, g_value_get_boolean (value));
            break;
    }
}

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;
    object_class->get_property = ephy_notebook_get_property;
    object_class->set_property = ephy_notebook_set_property;

    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_CLOSE_REQUEST] =
        g_signal_new ("tab-close-request",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EphyNotebookClass, tab_close_req),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__OBJECT,
                  G_TYPE_NONE,
                  1,
                  EPHY_TYPE_TAB);

    g_object_class_install_property (object_class,
                     PROP_DND_ENABLED,
                     g_param_spec_boolean ("dnd-enabled",
                                   "DND enabled",
                                   "Whether the notebook allows tab reordering by DND",
                                   TRUE,
                                   G_PARAM_READWRITE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB));

    g_object_class_install_property (object_class,
                     PROP_SHOW_TABS,
                     g_param_spec_boolean ("show-tabs",
                                   "Show tabs",
                                   "Whether the notebook shows the tabs bar",
                                   TRUE,
                                   G_PARAM_READWRITE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB));

    g_type_class_add_private (object_class, sizeof (EphyNotebookPrivate));
}

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

    /* FIXME multi-head */
    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))
    {
        return EPHY_NOTEBOOK (ephy_window_get_notebook
                    (EPHY_WINDOW (toplevel)));
    }

    return NULL;
}

static gboolean
is_in_notebook_window (EphyNotebook *notebook,
               gint abs_x, gint abs_y)
{
    EphyNotebook *nb_at_pointer;

    nb_at_pointer = find_notebook_at_pointer (abs_x, abs_y);

    return nb_at_pointer == notebook;
}

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);
        }
    }
#ifndef KEEP_TAB_IN_SAME_TOPLEVEL
    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);
    }
#endif
}

static void
drag_stop (EphyNotebook *notebook,
       guint32 time)
{
    EphyNotebookPrivate *priv = notebook->priv;
    GtkWidget *widget = GTK_WIDGET (notebook);
    GtkWidget *toplevel, *child;

    if (priv->drag_in_progress)
    {
        LOG ("Drag Stop");

        toplevel = gtk_widget_get_toplevel (widget);
        g_return_if_fail (GTK_WIDGET_TOPLEVEL (toplevel));

        child = gtk_bin_get_child (GTK_BIN (toplevel));
        g_return_if_fail (child != NULL);

        /* disconnect the signals before ungrabbing! */
        if (priv->toplevel_grab_broken_handler_id != 0)
        {
            g_signal_handler_disconnect (toplevel,
                             priv->toplevel_grab_broken_handler_id);
            priv->toplevel_grab_broken_handler_id = 0;
        }
        if (priv->grab_notify_handler_id != 0)
        {
            g_signal_handler_disconnect (notebook,
                             priv->grab_notify_handler_id);
            priv->grab_notify_handler_id = 0;
        }
        if (priv->toplevel_motion_notify_handler_id != 0)
        {
            g_signal_handler_disconnect (toplevel,
                             priv->toplevel_motion_notify_handler_id);
            priv->toplevel_motion_notify_handler_id = 0;
        }
        if (priv->toplevel_button_release_handler_id != 0)
        {
            g_signal_handler_disconnect (toplevel,
                             priv->toplevel_button_release_handler_id);
            priv->toplevel_button_release_handler_id = 0;
        }

        /* ungrab the pointer if it's grabbed */
        /* FIXME multihead */
        if (gdk_pointer_is_grabbed ())
        {
            gdk_pointer_ungrab (time);
        }

        gtk_grab_remove (toplevel);

        g_signal_emit (G_OBJECT (notebook), signals[TABS_REORDERED], 0);
    }

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

    priv->drag_in_progress = FALSE;
}

static gboolean
grab_broken_event_cb (GtkWidget *widget,
              GdkEventGrabBroken *event,
              EphyNotebook *notebook)
{
    LOG ("Grab Broken [%p]", notebook);

    drag_stop (notebook, GDK_CURRENT_TIME /* FIXME? */);

    return FALSE;
}

static void
grab_notify_cb (GtkWidget *widget,
            gboolean was_grabbed,
            EphyNotebook *notebook)
{
    LOG ("Grab Notify [%p, was-grabbed:%s]", notebook, was_grabbed ? "t" : "f");

    drag_stop (notebook, GDK_CURRENT_TIME /* FIXME? */);
}

static gboolean
toplevel_motion_notify_cb (GtkWidget *toplevel,
               GdkEventMotion *event,
               EphyNotebook *notebook)
{
    EphyNotebook *dest = NULL;
    int page_num, result;

    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,
                              event, page_num);
        }
        else
        {
            g_assert (page_num >= -1);
            move_tab (notebook, page_num);
        }
    }

    return FALSE;
}

static gboolean
toplevel_button_release_cb (GtkWidget *toplevel,
                GdkEventButton *event,
                EphyNotebook *notebook)
{
#ifndef KEEP_TAB_IN_SAME_TOPLEVEL
    EphyNotebookPrivate *priv = notebook->priv;

    if (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);
        }
    }
#endif

    /* This must be called even if a drag isn't happening */
    drag_stop (notebook, event->time);

    return FALSE;
}

static gboolean
drag_start (EphyNotebook *notebook,
        guint32 time)
{
    EphyNotebookPrivate *priv = notebook->priv;
    GtkWidget *widget = GTK_WIDGET (notebook);
    GtkWidget *toplevel, *child;

    /* FIXME multihead */
    if (priv->drag_in_progress || gdk_pointer_is_grabbed ()) return FALSE;

    LOG ("Drag Start");

    priv->drag_in_progress = TRUE;

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

    toplevel = gtk_widget_get_toplevel (widget);
    g_return_val_if_fail (GTK_WIDGET_TOPLEVEL (toplevel), FALSE);

    child = gtk_bin_get_child (GTK_BIN (toplevel));
    g_return_val_if_fail (child != NULL, FALSE);

    /* grab the pointer */
    gtk_grab_add (toplevel);

    /* FIXME multi-head */
    if (gdk_pointer_grab (toplevel->window,
                  FALSE,
                  GDK_BUTTON1_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
                  NULL, cursor, time) != GDK_GRAB_SUCCESS)
    {
        drag_stop (notebook, time);
        return FALSE;
    }

    g_return_val_if_fail (priv->toplevel_grab_broken_handler_id == 0, FALSE);
    g_return_val_if_fail (priv->toplevel_motion_notify_handler_id == 0, FALSE);
    g_return_val_if_fail (priv->toplevel_button_release_handler_id == 0, FALSE);
    g_return_val_if_fail (priv->grab_notify_handler_id == 0, FALSE);

    priv->toplevel_grab_broken_handler_id =
        g_signal_connect (toplevel, "grab-broken-event",
                  G_CALLBACK (grab_broken_event_cb), notebook);
    priv->toplevel_motion_notify_handler_id =
        g_signal_connect (toplevel, "motion-notify-event",
                  G_CALLBACK (toplevel_motion_notify_cb), notebook);
    priv->toplevel_button_release_handler_id =
        g_signal_connect (toplevel, "button-release-event",
                  G_CALLBACK (toplevel_button_release_cb), notebook);
    priv->grab_notify_handler_id =
        g_signal_connect (notebook, "grab-notify",
                  G_CALLBACK (grab_notify_cb), notebook);

    return TRUE;
}

/* 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)
{
    EphyNotebookPrivate *priv = notebook->priv;

    if (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))
        {
            return drag_start (notebook, event->time);
        }

        return FALSE;
    }

    return FALSE;
}

static void
move_tab_to_another_notebook (EphyNotebook *src,
                  EphyNotebook *dest,
                  GdkEventMotion *event,
                  int dest_position)
{
#ifndef KEEP_TAB_IN_SAME_TOPLEVEL
    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);

    /* Check if the dest notebook can accept the drag */
    if (!dest->priv->dnd_enabled) return;

    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, event->time);

    ephy_notebook_move_tab (src, dest, tab, dest_position);

    /* start drag handling in dest notebook */

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

    drag_start (dest, event->time);
#endif /* KEEP_TAB_IN_SAME_TOPLEVEL */
}

static gboolean
button_release_cb (EphyNotebook *notebook,
           GdkEventButton *event,
           gpointer data)
{
    /* This must be called even if a drag isn't happening */
    drag_stop (notebook, event->time);

    return FALSE;
}

static gboolean
button_press_cb (EphyNotebook *notebook,
         GdkEventButton *event,
         gpointer data)
{
    EphyNotebookPrivate *priv = notebook->priv;
    int tab_clicked;

    if (!notebook->priv->dnd_enabled) return FALSE;

    tab_clicked = find_tab_num_at_pos (notebook, event->x_root, event->y_root);

    /* FIXME: how could there be a drag in progress!? */
    if (notebook->priv->drag_in_progress)
    {
        return TRUE;
    }

    if ((event->button == 1) && (event->type == GDK_BUTTON_PRESS)
        && (tab_clicked >= 0))
    {
        priv->x_start = event->x_root;
        priv->y_start = event->y_root;
        priv->motion_notify_handler_id =
            g_signal_connect (notebook, "motion-notify-event",
                      G_CALLBACK (motion_notify_cb), NULL);
    }
    else if (GDK_BUTTON_PRESS == event->type && 3 == event->button)
    {
        if (tab_clicked == -1)
        {
            /* consume event, so that we don't pop up the context menu when
             * the mouse if not over a tab label
             */
            return TRUE;
        }
        else
        {
            /* switch to the page the mouse is over, but don't consume the event */
            gtk_notebook_set_current_page (GTK_NOTEBOOK (notebook), tab_clicked);
        }
    }

    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)
{
    EphyWindow *window;
    GtkWidget *notebook;

    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;

    window = EPHY_WINDOW (gtk_widget_get_toplevel (widget));
    notebook = ephy_window_get_notebook (window);

    if (selection_data->target == gdk_atom_intern (EPHY_DND_URL_TYPE, FALSE))
    {
        char **split;

        /* URL_TYPE has format: url \n title */
        split = g_strsplit ((const gchar *)selection_data->data, "\n", 2);
        if (split != NULL && split[0] != NULL && split[0][0] != '\0')
        {
            ephy_link_open (EPHY_LINK (notebook), split[0], tab,
                    tab ? 0 : EPHY_LINK_NEW_TAB);
        }
        g_strfreev (split);
    }
    else if (selection_data->target == gdk_atom_intern (EPHY_DND_URI_LIST_TYPE, FALSE))
    {
        char **uris;
        int i;

        uris = gtk_selection_data_get_uris (selection_data);
        if (uris == NULL) return;

        for (i = 0; uris[i] != NULL && i < INSANE_NUMBER_OF_URLS; i++)
        {
            tab = ephy_link_open (EPHY_LINK (notebook), uris[i],
                          tab, i == 0 ? 0 : EPHY_LINK_NEW_TAB);
        }

        g_strfreev (uris);
    }
    else
    {
        g_return_if_reached ();
    }
}

/*
 * 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->show_tabs = TRUE;
    notebook->priv->dnd_enabled = 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, G_N_ELEMENTS (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);

    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)
{
    GtkImage *icon;

    icon = GTK_IMAGE (g_object_get_data (G_OBJECT (proxy), "icon"));
    g_return_if_fail (icon != NULL);
    
    gtk_image_set_from_pixbuf (icon, ephy_tab_get_icon (tab));
}

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_composite (tab);

    if (title)
    {
        gtk_label_set_text (GTK_LABEL (label), title);
        gtk_tooltips_set_tip (tips, ebox, title, NULL);
    }
}

static void
close_button_clicked_cb (GtkWidget *widget, GtkWidget *tab)
{
    GtkWidget *notebook;

    notebook = gtk_widget_get_parent (tab);
    g_signal_emit (notebook, signals[TAB_CLOSE_REQUEST], 0, tab);
}

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

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

    char_width = pango_font_metrics_get_approximate_digit_width (metrics);
    pango_font_metrics_unref (metrics);

    gtk_icon_size_lookup_for_settings (gtk_widget_get_settings (hbox),
                       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 *hbox, *label_hbox, *label_ebox;
    GtkWidget *label, *close_button, *image, *spinner, *icon;
    GtkRcStyle *rcstyle;

    /* 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);
    /* don't allow focus on the close button */
    gtk_button_set_focus_on_click (GTK_BUTTON (close_button), FALSE);
    gtk_button_set_relief (GTK_BUTTON (close_button), GTK_RELIEF_NONE);

    rcstyle = gtk_rc_style_new ();
    rcstyle->xthickness = rcstyle->ythickness = 0;
    gtk_widget_modify_style (close_button, rcstyle);
    gtk_rc_style_unref (rcstyle),

    image = gtk_image_new_from_stock (GTK_STOCK_CLOSE, GTK_ICON_SIZE_MENU);
    gtk_container_add (GTK_CONTAINER (close_button), image);
    gtk_box_pack_start (GTK_BOX (hbox), close_button, FALSE, FALSE, 0);

    gtk_tooltips_set_tip (nb->priv->title_tips, close_button,
                  _("Close tab"), NULL);

    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 = gtk_label_new ("");
    gtk_label_set_ellipsize (GTK_LABEL (label), PANGO_ELLIPSIZE_END);
    gtk_label_set_single_line_mode (GTK_LABEL (label), TRUE);
    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 (hbox, "style-set",
              G_CALLBACK (tab_label_style_set_cb), NULL);

    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, G_N_ELEMENTS (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);

    /* The signal handler may have reordered the tabs */
    position = gtk_notebook_page_num (GTK_NOTEBOOK (nb), GTK_WIDGET (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 position, curr;
    GtkWidget *label, *ebox;

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

    /* 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);

    /* if that was the last tab, destroy the window */
    if (gtk_notebook_get_n_pages (GTK_NOTEBOOK (nb)) == 0)
    {
        gtk_widget_destroy (gtk_widget_get_toplevel (GTK_WIDGET (nb)));
    }
}