/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * gimpviewablebutton.c
 * Copyright (C) 2003 Michael Natterer <mitch@gimp.org>
 *
 * 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.
 */

#include "config.h"

#include <gtk/gtk.h>

#include "libgimpwidgets/gimpwidgets.h"

#include "widgets-types.h"

#include "core/gimpcontainer.h"
#include "core/gimpcontext.h"
#include "core/gimpviewable.h"

#include "gimpcontainerpopup.h"
#include "gimpdialogfactory.h"
#include "gimppropwidgets.h"
#include "gimppreviewrenderer.h"
#include "gimpviewablebutton.h"

#include "gimp-intl.h"


static void     gimp_viewable_button_class_init   (GimpViewableButtonClass *klass);
static void     gimp_viewable_button_init         (GimpViewableButton      *button);

static void     gimp_viewable_button_destroy      (GtkObject          *object);
static gboolean gimp_viewable_button_scroll_event (GtkWidget          *widget,
                                                   GdkEventScroll     *sevent);
static void     gimp_viewable_button_clicked      (GtkButton          *button);

static void     gimp_viewable_button_popup_closed (GimpContainerPopup *popup,
                                                   GimpViewableButton *button);


static GimpButtonClass *parent_class = NULL;


GType
gimp_viewable_button_get_type (void)
{
  static GType button_type = 0;

  if (!button_type)
    {
      static const GTypeInfo button_info =
      {
        sizeof (GimpViewableButtonClass),
        (GBaseInitFunc) NULL,
        (GBaseFinalizeFunc) NULL,
        (GClassInitFunc) gimp_viewable_button_class_init,
        NULL,           /* class_finalize */
        NULL,           /* class_data     */
        sizeof (GimpViewableButton),
        0,              /* n_preallocs    */
        (GInstanceInitFunc) gimp_viewable_button_init,
      };

      button_type = g_type_register_static (GIMP_TYPE_BUTTON,
                                            "GimpViewableButton",
                                            &button_info, 0);
    }

  return button_type;
}

static void
gimp_viewable_button_class_init (GimpViewableButtonClass *klass)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkButtonClass *button_class;

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

  parent_class = g_type_class_peek_parent (klass);

  object_class->destroy      = gimp_viewable_button_destroy;
  widget_class->scroll_event = gimp_viewable_button_scroll_event;
  button_class->clicked      = gimp_viewable_button_clicked;
}

static void
gimp_viewable_button_init (GimpViewableButton *button)
{
  button->popup_view_type      = GIMP_VIEW_TYPE_LIST;
  button->popup_preview_size   = GIMP_PREVIEW_SIZE_SMALL;

  button->preview_size         = GIMP_PREVIEW_SIZE_SMALL;
  button->preview_border_width = 1;
}

static void
gimp_viewable_button_destroy (GtkObject *object)
{
  GimpViewableButton *button = GIMP_VIEWABLE_BUTTON (object);

  if (button->dialog_identifier)
    {
      g_free (button->dialog_identifier);
      button->dialog_identifier = NULL;
    }

  if (button->dialog_stock_id)
    {
      g_free (button->dialog_stock_id);
      button->dialog_stock_id = NULL;
    }

  if (button->dialog_tooltip)
    {
      g_free (button->dialog_tooltip);
      button->dialog_tooltip = NULL;
    }

  GTK_OBJECT_CLASS (parent_class)->destroy (object);
}

static gboolean
gimp_viewable_button_scroll_event (GtkWidget      *widget,
                                   GdkEventScroll *sevent)
{
  GimpViewableButton *button = GIMP_VIEWABLE_BUTTON (widget);
  GimpObject         *object;
  gint                index;

  object = gimp_context_get_by_type (button->context,
                                     button->container->children_type);

  index = gimp_container_get_child_index (button->container, object);

  if (index != -1)
    {
      gint n_children;
      gint new_index = index;

      n_children = gimp_container_num_children (button->container);

      if (sevent->direction == GDK_SCROLL_UP)
        {
          if (index > 0)
            new_index--;
          else
            new_index = n_children - 1;
        }
      else if (sevent->direction == GDK_SCROLL_DOWN)
        {
          if (index == (n_children - 1))
            new_index = 0;
          else
            new_index++;
        }

      if (new_index != index)
        {
          object = gimp_container_get_child_by_index (button->container,
                                                      new_index);

          if (object)
            gimp_context_set_by_type (button->context,
                                      button->container->children_type,
                                      object);
        }
    }

  return TRUE;
}

static void
gimp_viewable_button_clicked (GtkButton *button)
{
  GimpViewableButton *viewable_button = GIMP_VIEWABLE_BUTTON (button);
  GtkWidget          *popup;

  popup = gimp_container_popup_new (viewable_button->container,
                                    viewable_button->context,
                                    viewable_button->popup_view_type,
                                    viewable_button->preview_size,
                                    viewable_button->popup_preview_size,
                                    viewable_button->preview_border_width,
                                    viewable_button->dialog_factory,
                                    viewable_button->dialog_identifier,
                                    viewable_button->dialog_stock_id,
                                    viewable_button->dialog_tooltip);

  g_signal_connect (popup, "cancel",
                    G_CALLBACK (gimp_viewable_button_popup_closed),
                    button);
  g_signal_connect (popup, "confirm",
                    G_CALLBACK (gimp_viewable_button_popup_closed),
                    button);

  gimp_container_popup_show (GIMP_CONTAINER_POPUP (popup), GTK_WIDGET (button));
}

static void
gimp_viewable_button_popup_closed (GimpContainerPopup *popup,
                                   GimpViewableButton *button)
{
  button->popup_view_type    = popup->view_type;
  button->popup_preview_size = popup->preview_size;
}


/*  public functions  */

GtkWidget *
gimp_viewable_button_new (GimpContainer     *container,
                          GimpContext       *context,
                          gint               preview_size,
                          gint               preview_border_width,
                          GimpDialogFactory *dialog_factory,
                          const gchar       *dialog_identifier,
                          const gchar       *dialog_stock_id,
                          const gchar       *dialog_tooltip)
{
  GimpViewableButton *button;
  const gchar        *prop_name;

  g_return_val_if_fail (GIMP_IS_CONTAINER (container), NULL);
  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
  g_return_val_if_fail (preview_size >  0 &&
                        preview_size <= GIMP_VIEWABLE_MAX_BUTTON_SIZE, NULL);
  g_return_val_if_fail (preview_border_width >= 0 &&
                        preview_border_width <= GIMP_PREVIEW_MAX_BORDER_WIDTH,
                        NULL);
  g_return_val_if_fail (dialog_factory == NULL ||
                        GIMP_IS_DIALOG_FACTORY (dialog_factory), NULL);
  if (dialog_factory)
    {
      g_return_val_if_fail (dialog_identifier != NULL, NULL);
      g_return_val_if_fail (dialog_stock_id != NULL, NULL);
      g_return_val_if_fail (dialog_tooltip != NULL, NULL);
    }

  button = g_object_new (GIMP_TYPE_VIEWABLE_BUTTON, NULL);

  button->container = container;
  button->context   = context;

  button->popup_preview_size   = preview_size;
  button->preview_size         = preview_size;
  button->preview_border_width = preview_border_width;

  if (dialog_factory)
    {
      button->dialog_factory    = dialog_factory;
      button->dialog_identifier = g_strdup (dialog_identifier);
      button->dialog_stock_id   = g_strdup (dialog_stock_id);
      button->dialog_tooltip    = g_strdup (dialog_tooltip);
    }

  prop_name = gimp_context_type_to_prop_name (container->children_type);

  button->preview = gimp_prop_preview_new (G_OBJECT (context), prop_name,
                                           button->preview_size);
  gtk_container_add (GTK_CONTAINER (button), button->preview);
  gtk_widget_show (button->preview);

  return GTK_WIDGET (button);
}

void
gimp_viewable_button_set_view_type (GimpViewableButton *button,
                                    GimpViewType        view_type)
{
  g_return_if_fail (GIMP_IS_VIEWABLE_BUTTON (button));

  button->popup_view_type = view_type;
}