path: root/widgets/misc/e-menu-tool-button.c

/*
 * e-menu-tool-button.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#include "e-menu-tool-button.h"

static gpointer parent_class;

static GtkWidget *
menu_tool_button_clone_image (GtkWidget *source)
{
    GtkIconSize size;
    GtkImageType image_type;
    const gchar *icon_name;

    /* XXX This isn't general purpose because it requires that the
     *     source image be using a named icon.  Somewhat surprised
     *     GTK+ doesn't offer something like this. */
    image_type = gtk_image_get_storage_type (GTK_IMAGE (source));
    g_return_val_if_fail (image_type == GTK_IMAGE_ICON_NAME, NULL);
    gtk_image_get_icon_name (GTK_IMAGE (source), &icon_name, &size);

    return gtk_image_new_from_icon_name (icon_name, size);
}

static GtkMenuItem *
menu_tool_button_get_first_menu_item (GtkMenuToolButton *menu_tool_button)
{
    GtkWidget *menu;
    GList *children;

    menu = gtk_menu_tool_button_get_menu (menu_tool_button);
    if (!GTK_IS_MENU (menu))
        return NULL;

    /* XXX GTK+ 2.18 provides no accessor function. */
    children = GTK_MENU_SHELL (menu)->children;
    if (children == NULL)
        return NULL;

    return GTK_MENU_ITEM (children->data);
}

static void
menu_tool_button_update_button (GtkToolButton *tool_button)
{
    GtkMenuItem *menu_item;
    GtkMenuToolButton *menu_tool_button;
    GtkImageMenuItem *image_menu_item;
    GtkAction *action;
    GtkWidget *image;
    gchar *tooltip = NULL;

    menu_tool_button = GTK_MENU_TOOL_BUTTON (tool_button);
    menu_item = menu_tool_button_get_first_menu_item (menu_tool_button);
    if (!GTK_IS_IMAGE_MENU_ITEM (menu_item))
        return;

    image_menu_item = GTK_IMAGE_MENU_ITEM (menu_item);
    image = gtk_image_menu_item_get_image (image_menu_item);
    if (!GTK_IS_IMAGE (image))
        return;

    image = menu_tool_button_clone_image (image);
    gtk_tool_button_set_icon_widget (tool_button, image);
    gtk_widget_show (image);

    /* If the menu item is a proxy for a GtkAction, extract
     * the action's tooltip and use it as our own tooltip. */
    action = gtk_activatable_get_related_action (
        GTK_ACTIVATABLE (menu_item));
    if (action != NULL)
        g_object_get (action, "tooltip", &tooltip, NULL);
    gtk_widget_set_tooltip_text (GTK_WIDGET (tool_button), tooltip);
    g_free (tooltip);
}

static void
menu_tool_button_size_request (GtkWidget *widget,
                               GtkRequisition *requisition)
{
    gint minimum_width;

    /* Chain up to parent's size_request() method. */
    GTK_WIDGET_CLASS (parent_class)->size_request (widget, requisition);

    /* XXX This is a hack.  This widget is only used for the New
     *     button in the main window toolbar.  The New button is
     *     pretty important, but the word "New" is pretty short
     *     (in English, anyway) and this results in a small screen
     *     target when using a "text below item" toolbar style.
     *
     *     We can't go hard-coding a width, but we -can- use a
     *     heuristic based on the toolbar button height. */
    minimum_width = requisition->height * 2;
    requisition->width = MAX (minimum_width, requisition->width);
}

static void
menu_tool_button_clicked (GtkToolButton *tool_button)
{
    GtkMenuItem *menu_item;
    GtkMenuToolButton *menu_tool_button;

    menu_tool_button = GTK_MENU_TOOL_BUTTON (tool_button);
    menu_item = menu_tool_button_get_first_menu_item (menu_tool_button);

    if (GTK_IS_MENU_ITEM (menu_item))
        gtk_menu_item_activate (menu_item);
}

static void
menu_tool_button_class_init (EMenuToolButtonClass *class)
{
    GtkWidgetClass *widget_class;
    GtkToolButtonClass *tool_button_class;

    parent_class = g_type_class_peek_parent (class);

    widget_class = GTK_WIDGET_CLASS (class);
    widget_class->size_request = menu_tool_button_size_request;

    tool_button_class = GTK_TOOL_BUTTON_CLASS (class);
    tool_button_class->clicked = menu_tool_button_clicked;
}

static void
menu_tool_button_init (EMenuToolButton *button)
{
    g_signal_connect (
        button, "notify::menu",
        G_CALLBACK (menu_tool_button_update_button), NULL);
}

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

    if (G_UNLIKELY (type == 0)) {
        const GTypeInfo type_info = {
            sizeof (EMenuToolButtonClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) menu_tool_button_class_init,
            (GClassFinalizeFunc) NULL,
            NULL,  /* class_data */
            sizeof (EMenuToolButton),
            0,     /* n_preallocs */
            (GInstanceInitFunc) menu_tool_button_init,
            NULL   /* value_table */
        };

        type = g_type_register_static (
            GTK_TYPE_MENU_TOOL_BUTTON, "EMenuToolButton",
            &type_info, 0);
    }

    return type;
}

GtkToolItem *
e_menu_tool_button_new (const gchar *label)
{
    return g_object_new (E_TYPE_MENU_TOOL_BUTTON, "label", label, NULL);
}