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eog-sidebar.c

/* Eye of Gnome - Side bar
 *
 * Copyright (C) 2004 Red Hat, Inc.
 * Copyright (C) 2007 The Free Software Foundation
 *
 * Author: Lucas Rocha <lucasr@gnome.org>
 *
 * Based on evince code (shell/ev-sidebar.c) by: 
 *    - Jonathan Blandford <jrb@alum.mit.edu>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

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

#include <string.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>

#include "eog-sidebar.h"

enum {
      PROP_0,
      PROP_CURRENT_PAGE
};

enum {
      PAGE_COLUMN_TITLE,
      PAGE_COLUMN_MENU_ITEM,
      PAGE_COLUMN_MAIN_WIDGET,
      PAGE_COLUMN_NOTEBOOK_INDEX,
      PAGE_COLUMN_NUM_COLS
};

enum {
      SIGNAL_PAGE_ADDED,
      SIGNAL_PAGE_REMOVED,
      SIGNAL_LAST
};

static gint signals[SIGNAL_LAST];

struct _EogSidebarPrivate {
      GtkWidget *notebook;
      GtkWidget *select_button;
      GtkWidget *menu;
      GtkWidget *hbox;
      GtkWidget *label;

      GtkTreeModel *page_model;
};

G_DEFINE_TYPE (EogSidebar, eog_sidebar, GTK_TYPE_VBOX)

#define EOG_SIDEBAR_GET_PRIVATE(object) \
      (G_TYPE_INSTANCE_GET_PRIVATE ((object), EOG_TYPE_SIDEBAR, EogSidebarPrivate))

static void
eog_sidebar_destroy (GtkObject *object)
{
      EogSidebar *eog_sidebar = EOG_SIDEBAR (object);

      if (eog_sidebar->priv->menu) {
            gtk_menu_detach (GTK_MENU (eog_sidebar->priv->menu));
            eog_sidebar->priv->menu = NULL;
      }
      
      if (eog_sidebar->priv->page_model) {
            g_object_unref (eog_sidebar->priv->page_model);
            eog_sidebar->priv->page_model = NULL;
      }
            
      (* GTK_OBJECT_CLASS (eog_sidebar_parent_class)->destroy) (object);
}

static void
eog_sidebar_select_page (EogSidebar *eog_sidebar, GtkTreeIter *iter)
{
      gchar *title;
      gint index;

      gtk_tree_model_get (eog_sidebar->priv->page_model, iter,
                      PAGE_COLUMN_TITLE, &title, 
                      PAGE_COLUMN_NOTEBOOK_INDEX, &index,
                      -1);

      gtk_notebook_set_current_page (GTK_NOTEBOOK (eog_sidebar->priv->notebook), index);
      gtk_label_set_text (GTK_LABEL (eog_sidebar->priv->label), title);

      g_free (title);
}

void
eog_sidebar_set_page (EogSidebar   *eog_sidebar,
                 GtkWidget   *main_widget)
{
      GtkTreeIter iter;
      gboolean valid;

      valid = gtk_tree_model_get_iter_first (eog_sidebar->priv->page_model, &iter);
         
      while (valid) {
            GtkWidget *widget;

            gtk_tree_model_get (eog_sidebar->priv->page_model, &iter,
                            PAGE_COLUMN_MAIN_WIDGET, &widget,
                            -1);
                   
            if (widget == main_widget) {
                  eog_sidebar_select_page (eog_sidebar, &iter);
                  valid = FALSE;
            } else {
                  valid = gtk_tree_model_iter_next (eog_sidebar->priv->page_model, &iter);
            }

            g_object_unref (widget);
      }

      g_object_notify (G_OBJECT (eog_sidebar), "current-page");
}

static GtkWidget *
eog_sidebar_get_current_page (EogSidebar *sidebar)
{
      GtkNotebook *notebook = GTK_NOTEBOOK (sidebar->priv->notebook);

      return gtk_notebook_get_nth_page
            (notebook, gtk_notebook_get_current_page (notebook));
}

static void
eog_sidebar_set_property (GObject     *object,
                     guint         prop_id,
                     const GValue *value,
                     GParamSpec   *pspec)
{
      EogSidebar *sidebar = EOG_SIDEBAR (object);

      switch (prop_id) {
      case PROP_CURRENT_PAGE:
            eog_sidebar_set_page (sidebar, g_value_get_object (value)); 
            break;
      default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      }
}

static void
eog_sidebar_get_property (GObject    *object,
                      guint       prop_id,
                      GValue     *value,
                      GParamSpec *pspec)
{
      EogSidebar *sidebar = EOG_SIDEBAR (object);

      switch (prop_id) {
      case PROP_CURRENT_PAGE:
            g_value_set_object (value, eog_sidebar_get_current_page (sidebar));
            break;
      default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      }
}

static void
eog_sidebar_class_init (EogSidebarClass *eog_sidebar_class)
{
      GObjectClass *g_object_class;
      GtkWidgetClass *widget_class;
      GtkObjectClass *gtk_object_klass;
 
      g_object_class = G_OBJECT_CLASS (eog_sidebar_class);
      widget_class = GTK_WIDGET_CLASS (eog_sidebar_class);
      gtk_object_klass = GTK_OBJECT_CLASS (eog_sidebar_class);
         
      g_type_class_add_private (g_object_class, sizeof (EogSidebarPrivate));
         
      gtk_object_klass->destroy = eog_sidebar_destroy;
      g_object_class->get_property = eog_sidebar_get_property;
      g_object_class->set_property = eog_sidebar_set_property;

      g_object_class_install_property (g_object_class,
                               PROP_CURRENT_PAGE,
                               g_param_spec_object ("current-page",
                                                "Current page",
                                                "The currently visible page",
                                                GTK_TYPE_WIDGET,
                                                G_PARAM_READWRITE));

      signals[SIGNAL_PAGE_ADDED] =
            g_signal_new ("page-added",
                        EOG_TYPE_SIDEBAR,
                        G_SIGNAL_RUN_FIRST,
                        G_STRUCT_OFFSET (EogSidebarClass, page_added),
                        NULL, NULL,
                        g_cclosure_marshal_VOID__OBJECT,
                        G_TYPE_NONE,
                        1,
                        GTK_TYPE_WIDGET);

      signals[SIGNAL_PAGE_REMOVED] =
            g_signal_new ("page-removed",
                        EOG_TYPE_SIDEBAR,
                        G_SIGNAL_RUN_FIRST,
                        G_STRUCT_OFFSET (EogSidebarClass, page_removed),
                        NULL, NULL,
                        g_cclosure_marshal_VOID__OBJECT,
                        G_TYPE_NONE,
                        1,
                        GTK_TYPE_WIDGET);
}

static void
eog_sidebar_menu_position_under (GtkMenu  *menu,
                         gint     *x,
                         gint     *y,
                         gboolean *push_in,
                         gpointer  user_data)
{
      GtkWidget *widget;

      g_return_if_fail (GTK_IS_BUTTON (user_data));
      g_return_if_fail (GTK_WIDGET_NO_WINDOW (user_data));

      widget = GTK_WIDGET (user_data);
         
      gdk_window_get_origin (widget->window, x, y);
         
      *x += widget->allocation.x;
      *y += widget->allocation.y + widget->allocation.height;
         
      *push_in = FALSE;
}

static gboolean
eog_sidebar_select_button_press_cb (GtkWidget      *widget,
                            GdkEventButton *event,
                            gpointer        user_data)
{
      EogSidebar *eog_sidebar = EOG_SIDEBAR (user_data);

      if (event->button == 1) {
            GtkRequisition requisition;
            gint width;
            
            width = widget->allocation.width;

            gtk_widget_set_size_request (eog_sidebar->priv->menu, -1, -1);
            gtk_widget_size_request (eog_sidebar->priv->menu, &requisition);
            gtk_widget_set_size_request (eog_sidebar->priv->menu,
                                   MAX (width, requisition.width), -1);
            
            gtk_widget_grab_focus (widget);
                   
            gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (widget), TRUE);

            gtk_menu_popup (GTK_MENU (eog_sidebar->priv->menu),
                        NULL, NULL, eog_sidebar_menu_position_under, widget,
                        event->button, event->time);

            return TRUE;
      }

      return FALSE;
}

static gboolean
eog_sidebar_select_button_key_press_cb (GtkWidget   *widget,
                                GdkEventKey *event,
                                gpointer     user_data)
{
      EogSidebar *eog_sidebar = EOG_SIDEBAR (user_data);
         
      if (event->keyval == GDK_space ||
          event->keyval == GDK_KP_Space ||
          event->keyval == GDK_Return ||
          event->keyval == GDK_KP_Enter) {
            gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (widget), TRUE);

            gtk_menu_popup (GTK_MENU (eog_sidebar->priv->menu),
                          NULL, NULL, eog_sidebar_menu_position_under, widget,
                        1, event->time);

            return TRUE;
      }

      return FALSE;
}

static void
eog_sidebar_close_clicked_cb (GtkWidget *widget,
                        gpointer   user_data)
{
      EogSidebar *eog_sidebar = EOG_SIDEBAR (user_data);

      gtk_widget_hide (GTK_WIDGET (eog_sidebar));
}

static void
eog_sidebar_menu_deactivate_cb (GtkWidget *widget,
                         gpointer   user_data)
{
      GtkWidget *menu_button;

      menu_button = GTK_WIDGET (user_data);
         
      gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (menu_button), FALSE);
}

static void
eog_sidebar_menu_detach_cb (GtkWidget *widget,
                     GtkMenu   *menu)
{
      EogSidebar *eog_sidebar = EOG_SIDEBAR (widget);
         
      eog_sidebar->priv->menu = NULL;
}

static void
eog_sidebar_menu_item_activate_cb (GtkWidget *widget,
                           gpointer   user_data)
{
      EogSidebar *eog_sidebar = EOG_SIDEBAR (user_data);
      GtkTreeIter iter;
      GtkWidget *menu_item, *item;
      gboolean valid;

      menu_item = gtk_menu_get_active (GTK_MENU (eog_sidebar->priv->menu));
      valid = gtk_tree_model_get_iter_first (eog_sidebar->priv->page_model, &iter);
         
      while (valid) {
            gtk_tree_model_get (eog_sidebar->priv->page_model, &iter,
                            PAGE_COLUMN_MENU_ITEM, &item,
                            -1);
                   
            if (item == menu_item) {
                  eog_sidebar_select_page (eog_sidebar, &iter);
                  valid = FALSE;
            } else {
                  valid = gtk_tree_model_iter_next (eog_sidebar->priv->page_model, &iter);
            }

            g_object_unref (item);
      }

      g_object_notify (G_OBJECT (eog_sidebar), "current-page");
}

static void
eog_sidebar_init (EogSidebar *eog_sidebar)
{
      GtkWidget *hbox;
      GtkWidget *close_button;
      GtkWidget *select_hbox;
      GtkWidget *arrow;
      GtkWidget *image;

      eog_sidebar->priv = EOG_SIDEBAR_GET_PRIVATE (eog_sidebar);

      /* data model */
      eog_sidebar->priv->page_model = (GtkTreeModel *)
                  gtk_list_store_new (PAGE_COLUMN_NUM_COLS,
                                  G_TYPE_STRING,
                                  GTK_TYPE_WIDGET,
                                  GTK_TYPE_WIDGET,
                                  G_TYPE_INT);

      /* top option menu */
      hbox = gtk_hbox_new (FALSE, 0);
      eog_sidebar->priv->hbox = hbox;
      gtk_box_pack_start (GTK_BOX (eog_sidebar), hbox, FALSE, FALSE, 0);
      gtk_widget_show (hbox);

      eog_sidebar->priv->select_button = gtk_toggle_button_new ();
      gtk_button_set_relief (GTK_BUTTON (eog_sidebar->priv->select_button), 
                         GTK_RELIEF_NONE);

      g_signal_connect (eog_sidebar->priv->select_button, "button_press_event",
                    G_CALLBACK (eog_sidebar_select_button_press_cb),
                    eog_sidebar);

      g_signal_connect (eog_sidebar->priv->select_button, "key_press_event",
                    G_CALLBACK (eog_sidebar_select_button_key_press_cb),
                    eog_sidebar);

      select_hbox = gtk_hbox_new (FALSE, 0);

      eog_sidebar->priv->label = gtk_label_new ("");

      gtk_box_pack_start (GTK_BOX (select_hbox),
                      eog_sidebar->priv->label,
                      FALSE, FALSE, 0);

      gtk_widget_show (eog_sidebar->priv->label);

      arrow = gtk_arrow_new (GTK_ARROW_DOWN, GTK_SHADOW_NONE);
      gtk_box_pack_end (GTK_BOX (select_hbox), arrow, FALSE, FALSE, 0);
      gtk_widget_show (arrow);

      gtk_container_add (GTK_CONTAINER (eog_sidebar->priv->select_button), select_hbox);
      gtk_widget_show (select_hbox);

      gtk_box_pack_start (GTK_BOX (hbox), eog_sidebar->priv->select_button, TRUE, TRUE, 0);
      gtk_widget_show (eog_sidebar->priv->select_button);

      close_button = gtk_button_new ();

      gtk_button_set_relief (GTK_BUTTON (close_button), GTK_RELIEF_NONE);

      g_signal_connect (close_button, "clicked",
                    G_CALLBACK (eog_sidebar_close_clicked_cb),
                    eog_sidebar);
         
      image = gtk_image_new_from_stock (GTK_STOCK_CLOSE,
                                GTK_ICON_SIZE_MENU);
      gtk_container_add (GTK_CONTAINER (close_button), image);
      gtk_widget_show (image);
   
      gtk_box_pack_end (GTK_BOX (hbox), close_button, FALSE, FALSE, 0);
      gtk_widget_show (close_button);
   
      eog_sidebar->priv->menu = gtk_menu_new ();

      g_signal_connect (eog_sidebar->priv->menu, "deactivate",
                    G_CALLBACK (eog_sidebar_menu_deactivate_cb),
                    eog_sidebar->priv->select_button);

      gtk_menu_attach_to_widget (GTK_MENU (eog_sidebar->priv->menu),
                           GTK_WIDGET (eog_sidebar),
                           eog_sidebar_menu_detach_cb);

      gtk_widget_show (eog_sidebar->priv->menu);

      eog_sidebar->priv->notebook = gtk_notebook_new ();

      gtk_notebook_set_show_border (GTK_NOTEBOOK (eog_sidebar->priv->notebook), FALSE);
      gtk_notebook_set_show_tabs (GTK_NOTEBOOK (eog_sidebar->priv->notebook), FALSE);

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

      gtk_widget_show (eog_sidebar->priv->notebook);
}

GtkWidget *
eog_sidebar_new (void)
{
      GtkWidget *eog_sidebar;

      eog_sidebar = g_object_new (EOG_TYPE_SIDEBAR, NULL);

      return eog_sidebar;
}

void
eog_sidebar_add_page (EogSidebar   *eog_sidebar,
                  const gchar  *title,
                  GtkWidget    *main_widget)
{
      GtkTreeIter iter;
      GtkWidget *menu_item;
      gchar *label_title;
      gint index;
         
      g_return_if_fail (EOG_IS_SIDEBAR (eog_sidebar));
      g_return_if_fail (GTK_IS_WIDGET (main_widget));
      
      index = gtk_notebook_append_page (GTK_NOTEBOOK (eog_sidebar->priv->notebook),
                                main_widget, NULL);
         
      menu_item = gtk_image_menu_item_new_with_label (title);

      g_signal_connect (menu_item, "activate",
                    G_CALLBACK (eog_sidebar_menu_item_activate_cb),
                    eog_sidebar);

      gtk_widget_show (menu_item);

      gtk_menu_shell_append (GTK_MENU_SHELL (eog_sidebar->priv->menu),
                         menu_item);

      /* Insert and move to end */
      gtk_list_store_insert_with_values (GTK_LIST_STORE (eog_sidebar->priv->page_model),
                                 &iter, 0,
                                 PAGE_COLUMN_TITLE, title,
                                 PAGE_COLUMN_MENU_ITEM, menu_item,
                                 PAGE_COLUMN_MAIN_WIDGET, main_widget,
                                 PAGE_COLUMN_NOTEBOOK_INDEX, index,
                                 -1);

      gtk_list_store_move_before (GTK_LIST_STORE(eog_sidebar->priv->page_model),
                            &iter, 
                            NULL);

      /* Set the first item added as active */
      gtk_tree_model_get_iter_first (eog_sidebar->priv->page_model, &iter);
      gtk_tree_model_get (eog_sidebar->priv->page_model,
                      &iter,
                      PAGE_COLUMN_TITLE, &label_title,
                      PAGE_COLUMN_NOTEBOOK_INDEX, &index,
                      -1);

      gtk_menu_set_active (GTK_MENU (eog_sidebar->priv->menu), index);

      gtk_label_set_text (GTK_LABEL (eog_sidebar->priv->label), label_title);

      gtk_notebook_set_current_page (GTK_NOTEBOOK (eog_sidebar->priv->notebook),
                               index);

      g_free (label_title);

      g_signal_emit (G_OBJECT (eog_sidebar), 
                   signals[SIGNAL_PAGE_ADDED], 0, main_widget);
}

void
eog_sidebar_remove_page (EogSidebar *eog_sidebar, GtkWidget *main_widget)
{
      GtkTreeIter iter;
      GtkWidget *widget, *menu_item;
      gboolean valid;
      gint index;

      g_return_if_fail (EOG_IS_SIDEBAR (eog_sidebar));
      g_return_if_fail (GTK_IS_WIDGET (main_widget));

      valid = gtk_tree_model_get_iter_first (eog_sidebar->priv->page_model, &iter);
         
      while (valid) {
            gtk_tree_model_get (eog_sidebar->priv->page_model, &iter,
                            PAGE_COLUMN_NOTEBOOK_INDEX, &index,
                            PAGE_COLUMN_MENU_ITEM, &menu_item,
                            PAGE_COLUMN_MAIN_WIDGET, &widget,
                            -1);
                   
            if (widget == main_widget) {
                  break;
            } else {
                  valid = gtk_tree_model_iter_next (eog_sidebar->priv->page_model, 
                                            &iter);
            }

            g_object_unref (menu_item);
            g_object_unref (widget);
      }

      if (valid) {
            gtk_notebook_remove_page (GTK_NOTEBOOK (eog_sidebar->priv->notebook), 
                                index);

            gtk_container_remove (GTK_CONTAINER (eog_sidebar->priv->menu), menu_item);

            gtk_list_store_remove (GTK_LIST_STORE (eog_sidebar->priv->page_model), 
                               &iter);

            g_signal_emit (G_OBJECT (eog_sidebar), 
                         signals[SIGNAL_PAGE_REMOVED], 0, main_widget);
      }
}

gint
eog_sidebar_get_n_pages (EogSidebar *eog_sidebar)
{
      g_return_val_if_fail (EOG_IS_SIDEBAR (eog_sidebar), TRUE);

      return gtk_tree_model_iter_n_children (
            GTK_TREE_MODEL (eog_sidebar->priv->page_model), NULL);
}

gboolean
eog_sidebar_is_empty (EogSidebar *eog_sidebar)
{
      g_return_val_if_fail (EOG_IS_SIDEBAR (eog_sidebar), TRUE);

      return gtk_tree_model_iter_n_children (
            GTK_TREE_MODEL (eog_sidebar->priv->page_model), NULL) == 0;
}

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