path: root/widgets/misc/e-dropdown-button.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-dropdown-menu.c
 *
 * Copyright (C) 2001 Ximian, Inc.
 *
 * 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.
 *
 * Authors:
 *   Ettore Perazzoli <ettore@ximian.com>
 *   Damon Chaplin <damon@ximian.com> 
 */

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

#include "e-dropdown-button.h"


#include <stdio.h>
#include <gtk/gtkarrow.h>
#include <gtk/gtklabel.h>
#include <gtk/gtkwidget.h>
#include <libgnomeui/gnome-popup-menu.h>
#include <gal/util/e-util.h>


struct _EDropdownButtonPrivate {
    GtkAccelGroup *accel_group;
    GtkWidget *menu;
};

#define PARENT_TYPE gtk_toggle_button_get_type ()
static GtkToggleButtonClass *parent_class = NULL;


/* Callback to position the pop-up menu.  */

static void
menu_position_cb (GtkMenu *menu,
          int *x,
          int *y,
          void *data)
{
    EDropdownButton *dropdown_button;
    EDropdownButtonPrivate *priv;
    GtkRequisition menu_requisition;
    int max_x, max_y;

    dropdown_button = E_DROPDOWN_BUTTON (data);
    priv = dropdown_button->priv;

    /* Calculate our preferred position.  */
    gdk_window_get_origin (GTK_WIDGET (dropdown_button)->window, x, y);
    *y += GTK_WIDGET (dropdown_button)->allocation.height;

    /* Now make sure we are on the screen.  */
    gtk_widget_size_request (GTK_WIDGET (priv->menu), &menu_requisition);
    max_x = MAX (0, gdk_screen_width () - menu_requisition.width);
    max_y = MAX (0, gdk_screen_height () - menu_requisition.height);

    *x = CLAMP (*x, 0, max_x);
    *y = CLAMP (*y, 0, max_y);
}

/* Callback for the "deactivate" signal on the pop-up menu.  This is used so
   that we unset the state of the toggle button when the pop-up menu
   disappears.  */

static int
menu_deactivate_cb (GtkMenuShell *menu_shell,
            void *data)
{
    EDropdownButton *dropdown_button;

    puts (__FUNCTION__);

    dropdown_button = E_DROPDOWN_BUTTON (data);

    gtk_button_clicked (GTK_BUTTON (dropdown_button));
    return TRUE;
}


/* GtkObject methods.  */

static void
impl_destroy (GtkObject *object)
{
    EDropdownButton *dropdown_button;
    EDropdownButtonPrivate *priv;

    dropdown_button = E_DROPDOWN_BUTTON (object);
    priv = dropdown_button->priv;

    gtk_accel_group_unref (priv->accel_group);
    gtk_widget_destroy (priv->menu);

    g_free (priv);
}


/* GtkWidget methods.  */

static int
impl_button_press_event (GtkWidget *widget,
             GdkEventButton *event)
{
    EDropdownButton *dropdown_button;
    EDropdownButtonPrivate *priv;
    GtkStateType new_state;

    dropdown_button = E_DROPDOWN_BUTTON (widget);
    priv = dropdown_button->priv;

    gtk_menu_popup (GTK_MENU (priv->menu), NULL, NULL,
            menu_position_cb, dropdown_button,
            1, GDK_CURRENT_TIME);

    gnome_popup_menu_do_popup (GTK_WIDGET (priv->menu), menu_position_cb, dropdown_button,
                   event, NULL);

    if (! GTK_WIDGET_HAS_FOCUS (widget))
        gtk_widget_grab_focus (widget);

    gtk_button_clicked (GTK_BUTTON (widget));

    return TRUE;
}


static void
class_init (EDropdownButtonClass *klass)
{
    GtkObjectClass *object_class;
    GtkWidgetClass *widget_class;

    object_class = GTK_OBJECT_CLASS (klass);
    widget_class = GTK_WIDGET_CLASS (klass);

    object_class->destroy = impl_destroy;

    widget_class->button_press_event = impl_button_press_event;

    parent_class = gtk_type_class (PARENT_TYPE);
}


static void
init (EDropdownButton *dropdown_button)
{
    EDropdownButtonPrivate *priv;

    priv = g_new (EDropdownButtonPrivate, 1);
    priv->accel_group = gtk_accel_group_new ();
    priv->menu        = NULL;

    dropdown_button->priv = priv;
}


/**
 * e_dropdown_button_construct:
 * @dropdown_button: A pointer to an %EDropdownButton object
 * @label_text: Text to display in the button
 * @menu: The menu to pop up when the button is pressed
 * 
 * Construct the @dropdown_button with the specified @label_text and the
 * associated @menu.
 **/
void
e_dropdown_button_construct (EDropdownButton *dropdown_button,
                 const char *label_text,
                 GtkMenu *menu)
{
    EDropdownButtonPrivate *priv;
    GtkWidget *hbox;
    GtkWidget *arrow;
    GtkWidget *label;
    unsigned int accel_key;

    g_return_if_fail (dropdown_button != NULL);
    g_return_if_fail (E_IS_DROPDOWN_BUTTON (dropdown_button));
    g_return_if_fail (label_text != NULL);
    g_return_if_fail (menu != NULL);
    g_return_if_fail (GTK_IS_MENU (menu));

    priv = dropdown_button->priv;

    hbox = gtk_hbox_new (FALSE, 2);
    gtk_container_add (GTK_CONTAINER (dropdown_button), hbox);
    gtk_widget_show (hbox);

    label = gtk_label_new ("");
    accel_key = gtk_label_parse_uline (GTK_LABEL (label), label_text);
    gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE, 0);
    gtk_widget_show (label);
    gtk_widget_add_accelerator (GTK_WIDGET (dropdown_button), "clicked",
                    priv->accel_group, accel_key, GDK_MOD1_MASK, 0);

    arrow = gtk_arrow_new (GTK_ARROW_DOWN, GTK_SHADOW_OUT);
    gtk_box_pack_start (GTK_BOX (hbox), arrow, FALSE, FALSE, 2);
    gtk_widget_show (arrow);

    priv->menu = GTK_WIDGET (menu);

    gtk_signal_connect_while_alive (GTK_OBJECT (priv->menu), "deactivate",
                    GTK_SIGNAL_FUNC (menu_deactivate_cb),
                    dropdown_button, GTK_OBJECT (dropdown_button));
}

/**
 * e_dropdown_button_new:
 * @label_text: Text to display in the button
 * @menu: The menu to pop up when the button is pressed
 * 
 * Create a new dropdown button.  When the button is clicked, the specified
 * @menu will be popped up.
 * 
 * Return value: A pointer to the newly created %EDropdownButton.
 **/
GtkWidget *
e_dropdown_button_new (const char *label_text,
               GtkMenu *menu)
{
    GtkWidget *widget;

    g_return_val_if_fail (label_text != NULL, NULL);
    g_return_val_if_fail (menu != NULL, NULL);
    g_return_val_if_fail (GTK_IS_MENU (menu), NULL);

    widget = gtk_type_new (e_dropdown_button_get_type ());

    e_dropdown_button_construct (E_DROPDOWN_BUTTON (widget), label_text, menu);
    return widget;
}


E_MAKE_TYPE (e_dropdown_button, "EDropdownButton", EDropdownButton, class_init, init, PARENT_TYPE)