path: root/shell/e-user-creatable-items-handler.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-shell-user-creatable-items-handler.c
 *
 * Copyright (C) 2001  Ximian, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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.
 *
 * Author: Ettore Perazzoli <ettore@ximian.com>
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "e-user-creatable-items-handler.h"

#include "e-shell-utils.h"

#include "widgets/misc/e-combo-button.h"

#include "e-util/e-corba-utils.h"

#include <gal/util/e-util.h>

#include <bonobo/bonobo-ui-util.h>
#include <bonobo/bonobo-exception.h>
#include <bonobo/bonobo-control.h>

#include <libgnome/gnome-i18n.h>

#include <gtk/gtksignal.h>
#include <gtk/gtktooltips.h>

#include <stdlib.h>
#include <ctype.h>
#include <string.h>


#define PARENT_TYPE G_TYPE_OBJECT
static GObjectClass *parent_class = NULL;


#define VERB_PREFIX "ShellUserCreatableItemVerb"

#define EVOLUTION_MAIL_OAFIID "OAFIID:GNOME_Evolution_Mail_ShellComponent"

#define SHELL_WINDOW_KEY          "EUserCreatableItemsHandler:shell_window"
#define COMBO_BUTTON_WIDGET_KEY "EUserCreatableItemsHandler:combo_button"
#define TOOLTIPS_KEY            "EUserCreatableItemsHandler:tooltips"

struct _Component {
    char *id;
    GNOME_Evolution_Component component;
    GNOME_Evolution_CreatableItemTypeList *type_list;
};
typedef struct _Component Component;

/* Representation of a single menu item.  */
struct _MenuItem {
    const char *label;
    char shortcut;
    char *verb;
    char *tooltip;
    char *component_id;
    GdkPixbuf *icon;
};
typedef struct _MenuItem MenuItem;

struct _EUserCreatableItemsHandlerPrivate {
    /* The components that register user creatable items.  */
    GSList *components; /* Component */

    /* The "New ..." menu items.  */
    GSList *menu_items;     /* MenuItem */

    /* The default item (the mailer's "message" item).  To be used when the
       component in the view we are in doesn't provide a default user
       creatable type.  This pointer always points to one of the menu items
       in ->menu_items.  */
    const MenuItem *default_menu_item;
};


/* Component struct handling.  */

static Component *
component_new (const char *id,
           GNOME_Evolution_Component component)
{
    CORBA_Environment ev;
    Component *new;

    CORBA_exception_init (&ev);

    new = g_new (Component, 1);
    new->id = g_strdup (id);

    new->type_list = GNOME_Evolution_Component__get_userCreatableItems (component, &ev);
    if (BONOBO_EX (&ev))
        new->type_list = NULL;

    new->component = component;
    Bonobo_Unknown_ref (new->component, &ev);

    if (ev._major != CORBA_NO_EXCEPTION)
        new->type_list = NULL;

    CORBA_exception_free (&ev);

    return new;
}

static void
component_free (Component *component)
{
    CORBA_Environment ev;

    CORBA_exception_init (&ev);

    Bonobo_Unknown_unref (component->component, &ev);

    g_free (component->id);

    if (component->type_list != NULL)
        CORBA_free (component->type_list);

    CORBA_exception_free (&ev);

    g_free (component);
}

static void
get_components_from_registry (EUserCreatableItemsHandler *handler,
                  EComponentRegistry *registry)
{
    GSList *registry_list = e_component_registry_peek_list (registry);
    GSList *p;

    for (p = registry_list; p != NULL; p = p->next) {
        EComponentInfo *info = p->data;
        Component *component;

        e_component_registry_activate (registry, info->id, NULL);

        if (info->iface != CORBA_OBJECT_NIL)
            component = component_new (info->id, info->iface);

        handler->priv->components = g_slist_prepend (handler->priv->components, component);
    }
}


/* Helper functions.  */

static gboolean
item_is_default (const MenuItem *item,
         const char *component_id)
{
    if (component_id == NULL)
        return FALSE;

    if (strcmp (item->component_id, component_id) == 0)
        return TRUE;
    else
        return FALSE;
}

static char *
create_verb_from_component_number_and_type_id (int component_num,
                           const char *type_id)
{
    return g_strdup_printf (VERB_PREFIX ":%d:%s", component_num, type_id);
}


/* Setting up menu items for the "File -> New" submenu and the "New" toolbar
   button.  */

static void
ensure_menu_items (EUserCreatableItemsHandler *handler)
{
    EUserCreatableItemsHandlerPrivate *priv;
    GSList *menu_items;
    GSList *p;
    int component_num;
    const char *default_verb;

    priv = handler->priv;
    if (priv->menu_items != NULL)
        return;

    menu_items = NULL;
    component_num = 0;
    default_verb = NULL;
    for (p = priv->components; p != NULL; p = p->next) {
        const Component *component;
        int i;

        component = (const Component *) p->data;
        if (component->type_list != NULL) {
            for (i = 0; i < component->type_list->_length; i ++) {
                const GNOME_Evolution_CreatableItemType *type;
                MenuItem *item;

                type = (const GNOME_Evolution_CreatableItemType *) component->type_list->_buffer + i;

                item = g_new (MenuItem, 1);
                item->label        = type->menuDescription;
                item->shortcut     = type->menuShortcut;
                item->verb         = create_verb_from_component_number_and_type_id (component_num, type->id);
                item->tooltip      = type->tooltip;
                item->component_id = g_strdup (component->id);

                if (strcmp (item->component_id, EVOLUTION_MAIL_OAFIID) == 0
                    && strcmp (type->id, "message") == 0)
                    default_verb = item->verb;

                if (type->iconName == "") {
                    item->icon = NULL;
                } else {
                    char *icon_path = e_shell_get_icon_path (type->iconName, TRUE);
                    item->icon = gdk_pixbuf_new_from_file (icon_path, NULL);
                    g_free (icon_path);
                }

                menu_items = g_slist_prepend (menu_items, item);
            }
        }

        component_num ++;
    }

    priv->menu_items = g_slist_reverse (menu_items);

    priv->default_menu_item = NULL;
    if (default_verb != NULL) {
        for (p = priv->menu_items; p != NULL; p = p->next) {
            const MenuItem *item;

            item = (const MenuItem *) p->data;
            if (strcmp (item->verb, default_verb) == 0)
                priv->default_menu_item = item;
        }
    }
}

static void
free_menu_items (GSList *menu_items)
{
    GSList *p;

    if (menu_items == NULL)
        return;

    for (p = menu_items; p != NULL; p = p->next) {
        MenuItem *item;

        item = (MenuItem *) p->data;
        g_free (item->verb);

        if (item->icon != NULL)
            g_object_unref (item->icon);

        g_free (item->component_id);
        g_free (item);
    }

    g_slist_free (menu_items);
}

static const MenuItem *
get_default_action_for_view (EUserCreatableItemsHandler *handler,
                 EShellWindow *window)
{
    EUserCreatableItemsHandlerPrivate *priv;
    const char *window_component_id;
    const GSList *p;

    priv = handler->priv;

    window_component_id = e_shell_window_peek_current_component_id (window);
    if (window_component_id == NULL)
        return priv->default_menu_item;

    for (p = priv->menu_items; p != NULL; p = p->next) {
        const MenuItem *item;

        item = (const MenuItem *) p->data;
        if (item_is_default (item, window_component_id))
            return item;
    }

    return priv->default_menu_item;
}


/* The XML description for "File -> New".  */

/* This adds a menu item for @item.  If @first is true, the keyboard shortcut
   is going to be "Control-N" instead of whatever the component defines.  */
static void
append_xml_for_menu_item (GString *xml,
              const MenuItem *item,
              gboolean first)
{
    char *encoded_label;
    char *encoded_tooltip;

    encoded_label = bonobo_ui_util_encode_str (item->label);
    g_string_append_printf (xml, "<menuitem name=\"New:%s\" verb=\"%s\" label=\"%s\"",
                item->verb, item->verb, encoded_label);

    if (first)
        g_string_append_printf (xml, " accel=\"*Control*N\"");
    else if (item->shortcut != '\0')
        g_string_append_printf (xml, " accel=\"*Control**Shift*%c\"", item->shortcut);

    if (item->icon != NULL) {
        char *icon_xml;

        icon_xml = bonobo_ui_util_pixbuf_to_xml (item->icon);
        g_string_append_printf (xml, " pixtype=\"pixbuf\" pixname=\"%s\"", icon_xml);
        g_free (icon_xml);
    }

    encoded_tooltip = bonobo_ui_util_encode_str (item->tooltip);
    g_string_append_printf (xml, " tip=\"%s\"", encoded_tooltip);

    g_string_append (xml, "/> ");

    g_free (encoded_label);
    g_free (encoded_tooltip);
}

static int
item_types_sort_func (const void *a,
              const void *b)
{
    const MenuItem *item_a;
    const MenuItem *item_b;
    const char *p1, *p2;

    item_a = (const MenuItem *) a;
    item_b = (const MenuItem *) b;

    p1 = item_a->label;
    p2 = item_b->label;

    while (*p1 != '\0' && *p2 != '\0') {
        if (*p1 == '_') {
            p1 ++;
            continue;
        }

        if (*p2 == '_') {
            p2 ++;
            continue;
        }

        if (toupper ((int) *p1) < toupper ((int) *p2))
            return -1;
        else if (toupper ((int) *p1) > toupper ((int) *p2))
            return +1;

        p1 ++, p2 ++;
    }

    if (*p1 == '\0') {
        if (*p2 == '\0')
            return 0;
        else
            return -1;
    } else {
        return +1;
    }
}

static char *
create_menu_xml (EUserCreatableItemsHandler *handler,
         const char *component_id)
{
    EUserCreatableItemsHandlerPrivate *priv;
    GString *xml;
    GSList *p;
    GSList *non_default_items;
    char *retval;

    priv = handler->priv;

    ensure_menu_items (handler);

    xml = g_string_new ("");

    g_string_append (xml, "<placeholder name=\"ComponentItems\">");
    g_string_append (xml, "<placeholder name=\"EUserCreatableItemsPlaceholder\">");

    /* 1. Add all the elements that are default for this component.  (Note
       that we don't need to do any sorting since the items are already
       sorted alphabetically.)  */

    if (component_id != NULL) {
        gboolean first = TRUE;

        for (p = priv->menu_items; p != NULL; p = p->next) {
            const MenuItem *item;

            item = (const MenuItem *) p->data;
            if (item_is_default (item, component_id)) {
                append_xml_for_menu_item (xml, item, first);
                first = FALSE;
            }
        }
    }

    /* 2. Add a separator. */

    if (component_id != NULL)
        g_string_append_printf (xml,
                    "<separator f=\"\" name=\"EUserCreatableItemsHandlerSeparator\"/>");

    /* 3. Add the elements that are not default for this component.  */

    non_default_items = NULL;
    for (p = priv->menu_items; p != NULL; p = p->next) {
        const MenuItem *item;

        item = (const MenuItem *) p->data;
        if (! item_is_default (item, component_id))
            non_default_items = g_slist_prepend (non_default_items, (void *) item);
    }

    non_default_items = g_slist_sort (non_default_items, item_types_sort_func);
    for (p = non_default_items; p != NULL; p = p->next)
        append_xml_for_menu_item (xml, (const MenuItem *) p->data, FALSE);
    g_slist_free (non_default_items);

    /* Done...  */

    g_string_append (xml, "</placeholder>"); /* EUserCreatableItemsPlaceholder */
    g_string_append (xml, "</placeholder>"); /* ComponentItems */

    retval = xml->str;
    g_string_free (xml, FALSE);

    return retval;
}


/* Verb handling.  */

static void
execute_verb (EUserCreatableItemsHandler *handler,
          EShellWindow *window,
          const char *verb_name)
{
    EUserCreatableItemsHandlerPrivate *priv;
    const Component *component;
    int component_number;
    const char *p;
    const char *id;
    GSList *component_list_item;
    int i;

    priv = handler->priv;

    p = strchr (verb_name, ':');
    g_assert (p != NULL);
    component_number = atoi (p + 1);

    p = strchr (p + 1, ':');
    g_assert (p != NULL);
    id = p + 1;

    component_list_item = g_slist_nth (priv->components, component_number);
    g_assert (component_list_item != NULL);

    component = (const Component *) component_list_item->data;

    if (component->type_list == NULL)
        return;

    for (i = 0; i < component->type_list->_length; i ++) {
        if (strcmp (component->type_list->_buffer[i].id, id) == 0) {
            CORBA_Environment ev;

            CORBA_exception_init (&ev);

            GNOME_Evolution_Component_requestCreateItem (component->component, id, &ev);

            if (ev._major != CORBA_NO_EXCEPTION)
                g_warning ("Error in requestCreateItem -- %s", BONOBO_EX_REPOID (&ev));

            CORBA_exception_free (&ev);
            return;
        }
    }
}

static void
verb_fn (BonoboUIComponent *ui_component,
     void *data,
     const char *verb_name)
{
    EUserCreatableItemsHandler *handler;
    EShellWindow *shell_window;

    shell_window = g_object_get_data (G_OBJECT (ui_component), SHELL_WINDOW_KEY);
    g_assert (E_IS_SHELL_WINDOW (shell_window));

    handler = E_USER_CREATABLE_ITEMS_HANDLER (data);

    execute_verb (handler, shell_window, verb_name);
}

static void
add_verbs (EUserCreatableItemsHandler *handler,
       EShellWindow *window)
{
    EUserCreatableItemsHandlerPrivate *priv;
    BonoboUIComponent *ui_component;
    int component_num;
    GSList *p;

    priv = handler->priv;

    ui_component = e_shell_window_peek_bonobo_ui_component (window);
    g_object_set_data (G_OBJECT (ui_component), SHELL_WINDOW_KEY, window);

    component_num = 0;
    for (p = priv->components; p != NULL; p = p->next) {
        const Component *component;
        int i;

        component = (const Component *) p->data;

        if (component->type_list != NULL) {
            for (i = 0; i < component->type_list->_length; i ++) {
                char *verb_name;

                verb_name = create_verb_from_component_number_and_type_id
                    (component_num, component->type_list->_buffer[i].id);

                bonobo_ui_component_add_verb (ui_component, verb_name, verb_fn, handler);

                g_free (verb_name);
            }
        }

        component_num ++;
    }
}


/* The "New" button in the toolbar.  */

static void
combo_button_activate_default_callback (EComboButton *combo_button,
                    void *data)
{
    EShellWindow *shell_window;
    EUserCreatableItemsHandler *handler;
    const MenuItem *menu_item;

    shell_window = E_SHELL_WINDOW (data);
    handler = e_shell_peek_user_creatable_items_handler (e_shell_window_peek_shell (shell_window));

    menu_item = get_default_action_for_view (handler, shell_window);
    execute_verb (handler, shell_window, menu_item->verb);
}

static void
setup_toolbar_button (EUserCreatableItemsHandler *handler,
              EShellWindow *window)
{
    EUserCreatableItemsHandlerPrivate *priv;
    BonoboUIComponent *ui_component;
    GtkWidget *combo_button;
    GtkWidget *menu;
    GtkTooltips *tooltips;
    BonoboControl *control;

    priv = handler->priv;

    menu = gtk_menu_new ();

    combo_button = e_combo_button_new ();
    e_combo_button_set_menu (E_COMBO_BUTTON (combo_button), GTK_MENU (menu));
    e_combo_button_set_label (E_COMBO_BUTTON (combo_button), _("New"));
    gtk_widget_show (combo_button);

    g_signal_connect (combo_button, "activate_default", G_CALLBACK (combo_button_activate_default_callback), window);

    ui_component = e_shell_window_peek_bonobo_ui_component (window);
    bonobo_window_add_popup (BONOBO_WINDOW (window), GTK_MENU (menu), "/popups/NewPopup");

    control = bonobo_control_new (combo_button);

    bonobo_ui_component_object_set (ui_component, "/Toolbar/NewComboButton",
                    BONOBO_OBJREF (control), NULL);

    bonobo_object_unref (control);
    
    g_object_set_data (G_OBJECT (window), COMBO_BUTTON_WIDGET_KEY, combo_button);

    tooltips = gtk_tooltips_new ();
    g_object_set_data (G_OBJECT (combo_button), TOOLTIPS_KEY, tooltips);
}


static void
update_for_window (EUserCreatableItemsHandler *handler,
           EShellWindow *window)
{
    GtkWidget *combo_button_widget;
    GtkTooltips *tooltips;
    BonoboUIComponent *ui_component;
    const MenuItem *default_menu_item;
    char *menu_xml;

    combo_button_widget = g_object_get_data (G_OBJECT (window), COMBO_BUTTON_WIDGET_KEY);
    g_assert (E_IS_COMBO_BUTTON (combo_button_widget));

    tooltips = g_object_get_data (G_OBJECT (combo_button_widget), TOOLTIPS_KEY);
    g_assert (tooltips != NULL);

    default_menu_item = get_default_action_for_view (handler, window);
    if (default_menu_item == NULL) {
        gtk_widget_set_sensitive (combo_button_widget, FALSE);
        e_combo_button_set_label (E_COMBO_BUTTON (combo_button_widget), _("New"));
        e_combo_button_set_icon (E_COMBO_BUTTON (combo_button_widget), NULL);
        gtk_tooltips_set_tip (tooltips, combo_button_widget, NULL, NULL);
        return;
    }

    gtk_widget_set_sensitive (combo_button_widget, TRUE);

    e_combo_button_set_icon (E_COMBO_BUTTON (combo_button_widget), default_menu_item->icon);
    gtk_tooltips_set_tip (tooltips, combo_button_widget, default_menu_item->tooltip, NULL);

    ui_component = e_shell_window_peek_bonobo_ui_component (window);
    bonobo_ui_component_rm (ui_component, "/menu/File/New/ComponentItems/EUserCreatableItemsPlaceholder", NULL);
    bonobo_ui_component_rm (ui_component, "/popups/NewPopup/ComponentItems/EUserCreatableItemsPlaceholder", NULL);

    menu_xml = create_menu_xml (handler, e_shell_window_peek_current_component_id (window));

    bonobo_ui_component_set (ui_component, "/menu/File/New", menu_xml, NULL);
    bonobo_ui_component_set (ui_component, "/popups/NewPopup", menu_xml, NULL);
    g_free (menu_xml);
}


/* This handles the menus for a given EShellWindow.  We have to rebuild the menu
   and set the toolbar button every time the view changes, and clean up when
   the view is destroyed.  */

static void
shell_window_component_changed_callback (EShellWindow *shell_window,
                     EUserCreatableItemsHandler *handler)
{
    update_for_window (handler, shell_window);
}


/* GObject methods.  */

static void
impl_dispose (GObject *object)
{
    EUserCreatableItemsHandler *handler;
    EUserCreatableItemsHandlerPrivate *priv;
    GSList *p;

    handler = E_USER_CREATABLE_ITEMS_HANDLER (object);
    priv = handler->priv;

    for (p = priv->components; p != NULL; p = p->next)
        component_free ((Component *) p->data);

    g_slist_free (priv->components);
    priv->components = NULL;

    
    (* G_OBJECT_CLASS (parent_class)->dispose) (object);
}

static void
impl_finalize (GObject *object)
{
    EUserCreatableItemsHandler *handler;
    EUserCreatableItemsHandlerPrivate *priv;

    handler = E_USER_CREATABLE_ITEMS_HANDLER (object);
    priv = handler->priv;

    free_menu_items (priv->menu_items);

    g_free (priv);

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


static void
class_init (GObjectClass *object_class)
{
    parent_class = g_type_class_ref(PARENT_TYPE);

    object_class->dispose  = impl_dispose;
    object_class->finalize = impl_finalize;
}

static void
init (EUserCreatableItemsHandler *shell_user_creatable_items_handler)
{
    EUserCreatableItemsHandlerPrivate *priv;

    priv = g_new (EUserCreatableItemsHandlerPrivate, 1);
    priv->components    = NULL;
    priv->menu_items    = NULL;
    priv->default_menu_item = NULL;

    shell_user_creatable_items_handler->priv = priv;
}


EUserCreatableItemsHandler *
e_user_creatable_items_handler_new (EComponentRegistry *registry)
{
    EUserCreatableItemsHandler *new;

    new = g_object_new (e_user_creatable_items_handler_get_type (), NULL);

    get_components_from_registry (new, registry);

    return new;
}


/**
 * e_user_creatable_items_handler_attach_menus:
 * @handler: 
 * @shell_window: 
 * 
 * Set up the menus and toolbar items for @shell_window.  When the shell changes
 * view, the menu and the toolbar item will update automatically (i.e. the
 * actions for the current folder will go on top etc.).
 **/
void
e_user_creatable_items_handler_attach_menus (EUserCreatableItemsHandler *handler,
                         EShellWindow *window)
{
    BonoboUIComponent *ui_component;
    EUserCreatableItemsHandlerPrivate *priv;
    char *menu_xml;

    g_return_if_fail (E_IS_USER_CREATABLE_ITEMS_HANDLER (handler));
    g_return_if_fail (E_IS_SHELL_WINDOW (window));

    priv = handler->priv;

    setup_toolbar_button (handler, window);
    g_signal_connect (window, "component_changed", G_CALLBACK (shell_window_component_changed_callback), handler);

    add_verbs (handler, window);
    menu_xml = create_menu_xml (handler, e_shell_window_peek_current_component_id (window));

    ui_component = e_shell_window_peek_bonobo_ui_component (window);
    bonobo_ui_component_set (ui_component, "/menu/File/New", menu_xml, NULL);
    bonobo_ui_component_set (ui_component, "/popups/NewPopup", menu_xml, NULL);

    g_free (menu_xml);

    update_for_window (handler, window);
}


E_MAKE_TYPE (e_user_creatable_items_handler, "EUserCreatableItemsHandler", EUserCreatableItemsHandler, class_init, init, PARENT_TYPE)