/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * gimplayerlistview.c
 * Copyright (C) 2001 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 "libgimpmath/gimpmath.h"
#include "libgimpwidgets/gimpwidgets.h"

#include "widgets-types.h"

#include "core/gimpcontainer.h"
#include "core/gimplayer.h"
#include "core/gimpimage.h"

#include "gimpdnd.h"
#include "gimplayerlistview.h"
#include "gimplistitem.h"
#include "gimpwidgets-constructors.h"

#include "libgimp/gimpintl.h"


static void   gimp_layer_list_view_class_init (GimpLayerListViewClass *klass);
static void   gimp_layer_list_view_init       (GimpLayerListView      *view);

static void   gimp_layer_list_view_style_set      (GtkWidget         *widget,
						   GtkStyle          *prev_style);

static void   gimp_layer_list_view_set_container  (GimpContainerView *view,
						   GimpContainer     *container);
static void   gimp_layer_list_view_select_item    (GimpContainerView *view,
						   GimpViewable      *item,
						   gpointer           insert_data);

static void   gimp_layer_list_view_anchor_clicked (GtkWidget         *widget,
						   GimpLayerListView *view);

static void   gimp_layer_list_view_paint_mode_menu_callback
                                                  (GtkWidget         *widget,
						   GimpLayerListView *view);
static void   gimp_layer_list_view_preserve_button_toggled
                                                  (GtkWidget         *widget,
						   GimpLayerListView *view);
static void   gimp_layer_list_view_opacity_scale_changed
                                                  (GtkAdjustment     *adjustment,
						   GimpLayerListView *view);

static void   gimp_layer_list_view_layer_signal_handler
                                                  (GimpLayer         *layer,
						   GimpLayerListView *view);
static void   gimp_layer_list_view_update_options (GimpLayerListView *view,
						   GimpLayer         *layer);


static GimpDrawableListViewClass *parent_class = NULL;


GType
gimp_layer_list_view_get_type (void)
{
  static GType view_type = 0;

  if (! view_type)
    {
      static const GTypeInfo view_info =
      {
        sizeof (GimpLayerListViewClass),
        NULL,           /* base_init */
        NULL,           /* base_finalize */
        (GClassInitFunc) gimp_layer_list_view_class_init,
        NULL,           /* class_finalize */
        NULL,           /* class_data */
        sizeof (GimpLayerListView),
        0,              /* n_preallocs */
        (GInstanceInitFunc) gimp_layer_list_view_init,
      };

      view_type = g_type_register_static (GIMP_TYPE_DRAWABLE_LIST_VIEW,
                                          "GimpLayerListView",
                                          &view_info, 0);
    }

  return view_type;
}

static void
gimp_layer_list_view_class_init (GimpLayerListViewClass *klass)
{
  GtkWidgetClass         *widget_class;
  GimpContainerViewClass *container_view_class;

  widget_class         = GTK_WIDGET_CLASS (klass);
  container_view_class = GIMP_CONTAINER_VIEW_CLASS (klass);

  parent_class = g_type_class_peek_parent (klass);

  widget_class->style_set             = gimp_layer_list_view_style_set;

  container_view_class->set_container = gimp_layer_list_view_set_container;
  container_view_class->select_item   = gimp_layer_list_view_select_item;
}

static void
gimp_layer_list_view_init (GimpLayerListView *view)
{
  GimpDrawableListView *drawable_view;
  GtkWidget            *abox;
  GtkWidget            *hbox;

  drawable_view = GIMP_DRAWABLE_LIST_VIEW (view);

  view->options_box = gtk_table_new (2, 3, FALSE);
  gtk_table_set_col_spacings (GTK_TABLE (view->options_box), 2);
  gtk_box_pack_start (GTK_BOX (view), view->options_box, FALSE, FALSE, 0);
  gtk_box_reorder_child (GTK_BOX (view), view->options_box, 0);
  gtk_widget_show (view->options_box);

  hbox = gtk_hbox_new (FALSE, 2);

  /*  Paint mode menu  */

  view->paint_mode_menu =
    gimp_paint_mode_menu_new (G_CALLBACK (gimp_layer_list_view_paint_mode_menu_callback),
			      view,
			      FALSE,
			      GIMP_NORMAL_MODE);
  gtk_box_pack_start (GTK_BOX (hbox), view->paint_mode_menu, FALSE, FALSE, 0);
  gtk_widget_show (view->paint_mode_menu);

  gimp_help_set_help_data (view->paint_mode_menu, 
			   NULL, "#paint_mode_menu");

  /*  Preserve transparency toggle  */

  abox = gtk_alignment_new (0.5, 0.5, 0.0, 0.0);
  gtk_box_pack_start (GTK_BOX (hbox), abox, FALSE, FALSE, 0);
  gtk_widget_show (abox);

  view->preserve_trans_toggle =
    gtk_toggle_button_new_with_label (_("Keep Trans."));
  gtk_container_add (GTK_CONTAINER (abox), view->preserve_trans_toggle);
  gtk_widget_show (view->preserve_trans_toggle);

  g_signal_connect (G_OBJECT (view->preserve_trans_toggle), "toggled",
		    G_CALLBACK (gimp_layer_list_view_preserve_button_toggled),
		    view);

  gimp_help_set_help_data (view->preserve_trans_toggle,
			   _("Keep Transparency"), "#keep_trans_button");

  gimp_table_attach_aligned (GTK_TABLE (view->options_box), 0, 0,
			     _("Mode:"), 1.0, 0.5,
			     hbox, 2, TRUE);

  /*  Opacity scale  */

  view->opacity_adjustment =
    GTK_ADJUSTMENT (gimp_scale_entry_new (GTK_TABLE (view->options_box), 0, 1,
					  _("Opacity:"), -1, 50,
					  100.0, 0.0, 100.0, 1.0, 10.0, 1,
					  TRUE, 0.0, 0.0,
					  NULL, "#opacity_sacle"));

  g_signal_connect (G_OBJECT (view->opacity_adjustment), "value_changed",
		    G_CALLBACK (gimp_layer_list_view_opacity_scale_changed),
		    view);

  /*  Anchor button  */

  view->anchor_button =
    gimp_editor_add_button (GIMP_EDITOR (view),
                            GIMP_STOCK_ANCHOR,
                            _("Anchor"), NULL,
                            G_CALLBACK (gimp_layer_list_view_anchor_clicked),
                            NULL,
                            view);

  gtk_box_reorder_child (GTK_BOX (GIMP_EDITOR (view)->button_box),
			 view->anchor_button, 5);

  gimp_container_view_enable_dnd (GIMP_CONTAINER_VIEW (view),
				  GTK_BUTTON (view->anchor_button),
				  GIMP_TYPE_LAYER);

  gtk_widget_set_sensitive (view->options_box,   FALSE);
  gtk_widget_set_sensitive (view->anchor_button, FALSE);

  view->mode_changed_handler_id           = 0;
  view->opacity_changed_handler_id        = 0;
  view->preserve_trans_changed_handler_id = 0;
}

static void
gimp_layer_list_view_style_set (GtkWidget *widget,
				GtkStyle  *prev_style)
{
  GimpLayerListView *layer_view;
  gint               content_spacing;
  gint               button_spacing;

  layer_view = GIMP_LAYER_LIST_VIEW (widget);

  gtk_widget_style_get (widget,
                        "content_spacing", &content_spacing,
                        "button_spacing",  &button_spacing,
			NULL);

  gtk_table_set_col_spacings (GTK_TABLE (layer_view->options_box),
			      button_spacing);
  gtk_table_set_row_spacings (GTK_TABLE (layer_view->options_box),
			      content_spacing);

  if (GTK_WIDGET_CLASS (parent_class)->style_set)
    GTK_WIDGET_CLASS (parent_class)->style_set (widget, prev_style);
}


/*  GimpContainerView methods  */

static void
gimp_layer_list_view_set_container (GimpContainerView *view,
				    GimpContainer     *container)
{
  GimpLayerListView *layer_view;

  layer_view = GIMP_LAYER_LIST_VIEW (view);

  if (view->container)
    {
      gimp_container_remove_handler (view->container,
				     layer_view->mode_changed_handler_id);
      gimp_container_remove_handler (view->container,
				     layer_view->opacity_changed_handler_id);
      gimp_container_remove_handler (view->container,
				     layer_view->preserve_trans_changed_handler_id);
    }

  if (GIMP_CONTAINER_VIEW_CLASS (parent_class)->set_container)
    GIMP_CONTAINER_VIEW_CLASS (parent_class)->set_container (view, container);

  if (view->container)
    {
      layer_view->mode_changed_handler_id =
	gimp_container_add_handler (view->container, "mode_changed",
				    G_CALLBACK (gimp_layer_list_view_layer_signal_handler),
				    view);
      layer_view->opacity_changed_handler_id =
	gimp_container_add_handler (view->container, "opacity_changed",
				    G_CALLBACK (gimp_layer_list_view_layer_signal_handler),
				    view);
      layer_view->preserve_trans_changed_handler_id =
	gimp_container_add_handler (view->container, "preserve_trans_changed",
				    G_CALLBACK (gimp_layer_list_view_layer_signal_handler),
				    view);
    }
}

static void
gimp_layer_list_view_select_item (GimpContainerView *view,
				  GimpViewable      *item,
				  gpointer           insert_data)
{
  GimpItemListView  *item_view;
  GimpLayerListView *layer_view;
  gboolean           options_sensitive   = FALSE;
  gboolean           anchor_sensitive    = FALSE;
  gboolean           raise_sensitive     = FALSE;

  item_view  = GIMP_ITEM_LIST_VIEW (view);
  layer_view = GIMP_LAYER_LIST_VIEW (view);

  if (GIMP_CONTAINER_VIEW_CLASS (parent_class)->select_item)
    GIMP_CONTAINER_VIEW_CLASS (parent_class)->select_item (view,
							   item,
							   insert_data);

  if (item)
    {
      gimp_layer_list_view_update_options (layer_view, GIMP_LAYER (item));

      options_sensitive = TRUE;

      if (gimp_layer_is_floating_sel (GIMP_LAYER (item)))
	{
	  anchor_sensitive = TRUE;

	  gtk_widget_set_sensitive (item_view->lower_button,     FALSE);
	  gtk_widget_set_sensitive (item_view->duplicate_button, FALSE);
	  gtk_widget_set_sensitive (item_view->edit_button,      FALSE);
	}
      else
	{
	  if (gimp_drawable_has_alpha (GIMP_DRAWABLE (item)) &&
	      gimp_container_get_child_index (view->container,
					      GIMP_OBJECT (item)))
	    {
	      raise_sensitive = TRUE;
	    }
	}
    }

  gtk_widget_set_sensitive (layer_view->options_box,   options_sensitive);
  gtk_widget_set_sensitive (item_view->raise_button,   raise_sensitive);
  gtk_widget_set_sensitive (layer_view->anchor_button, anchor_sensitive);
}


/*  "Anchor" functions  */

static void
gimp_layer_list_view_anchor_clicked (GtkWidget         *widget,
				     GimpLayerListView *view)
{
  GimpItemListView *item_view;
  GimpLayer        *layer;

  item_view = GIMP_ITEM_LIST_VIEW (view);

  layer = (GimpLayer *) item_view->get_item_func (item_view->gimage);

  if (view->anchor_item_func)
    {
      view->anchor_item_func (layer);
    }
}


/*  Paint Mode, Opacity and Preserve trans. callbacks  */

#define BLOCK() \
        g_signal_handlers_block_by_func (G_OBJECT (layer), \
	gimp_layer_list_view_layer_signal_handler, view)

#define UNBLOCK() \
        g_signal_handlers_unblock_by_func (G_OBJECT (layer), \
	gimp_layer_list_view_layer_signal_handler, view)


static void
gimp_layer_list_view_paint_mode_menu_callback (GtkWidget         *widget,
					       GimpLayerListView *view)
{
  GimpItemListView *item_view;
  GimpLayer        *layer;

  item_view = GIMP_ITEM_LIST_VIEW (view);

  layer = (GimpLayer *) item_view->get_item_func (item_view->gimage);

  if (GIMP_IS_LAYER (layer))
    {
      GimpLayerModeEffects mode;

      mode = (GimpLayerModeEffects)
	GPOINTER_TO_INT (g_object_get_data (G_OBJECT (widget),
                                            "gimp-item-data"));

      if (gimp_layer_get_mode (layer) != mode)
	{
	  BLOCK();
	  gimp_layer_set_mode (layer, mode);
	  UNBLOCK();

	  gimp_image_flush (item_view->gimage);
	}
    }
}

static void
gimp_layer_list_view_preserve_button_toggled (GtkWidget         *widget,
					      GimpLayerListView *view)
{
  GimpItemListView *item_view;
  GimpLayer        *layer;

  item_view = GIMP_ITEM_LIST_VIEW (view);

  layer = (GimpLayer *) item_view->get_item_func (item_view->gimage);

  if (GIMP_IS_LAYER (layer))
    {
      gboolean preserve_trans;

      preserve_trans = GTK_TOGGLE_BUTTON (widget)->active;

      if (gimp_layer_get_preserve_trans (layer) != preserve_trans)
	{
	  BLOCK();
	  gimp_layer_set_preserve_trans (layer, preserve_trans);
	  UNBLOCK();
	}
    }
}

static void
gimp_layer_list_view_opacity_scale_changed (GtkAdjustment     *adjustment,
					    GimpLayerListView *view)
{
  GimpItemListView *item_view;
  GimpLayer        *layer;

  item_view = GIMP_ITEM_LIST_VIEW (view);

  layer = (GimpLayer *) item_view->get_item_func (item_view->gimage);

  if (GIMP_IS_LAYER (layer))
    {
      gdouble opacity;

      opacity = adjustment->value / 100.0;

      if (gimp_layer_get_opacity (layer) != opacity)
	{
	  BLOCK();
	  gimp_layer_set_opacity (layer, opacity);
	  UNBLOCK();

	  gimp_image_flush (item_view->gimage);
	}
    }
}

#undef BLOCK
#undef UNBLOCK


static void
gimp_layer_list_view_layer_signal_handler (GimpLayer         *layer,
					   GimpLayerListView *view)
{
  GimpItemListView *item_view;

  item_view = GIMP_ITEM_LIST_VIEW (view);

  if (item_view->get_item_func (item_view->gimage) == (GimpViewable *) layer)
    {
      gimp_layer_list_view_update_options (view, layer);
    }
}


#define BLOCK(object,function) \
        g_signal_handlers_block_by_func (G_OBJECT (object), \
	                                 (function), view)

#define UNBLOCK(object,function) \
        g_signal_handlers_unblock_by_func (G_OBJECT (object), \
	                                   (function), view)

static void
gimp_layer_list_view_update_options (GimpLayerListView *view,
				     GimpLayer         *layer)
{
  gimp_option_menu_set_history (GTK_OPTION_MENU (view->paint_mode_menu),
				GINT_TO_POINTER (layer->mode));

  if (layer->preserve_trans !=
      GTK_TOGGLE_BUTTON (view->preserve_trans_toggle)->active)
    {
      BLOCK (view->preserve_trans_toggle,
	     gimp_layer_list_view_preserve_button_toggled);

      gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (view->preserve_trans_toggle),
				    layer->preserve_trans);

      UNBLOCK (view->preserve_trans_toggle,
	       gimp_layer_list_view_preserve_button_toggled);
      }

  if (layer->opacity * 100.0 != view->opacity_adjustment->value)
    {
      BLOCK (view->opacity_adjustment,
	     gimp_layer_list_view_opacity_scale_changed);

      gtk_adjustment_set_value (view->opacity_adjustment,
                                layer->opacity * 100.0);

      UNBLOCK (view->opacity_adjustment,
	       gimp_layer_list_view_opacity_scale_changed);
    }
}

#undef BLOCK
#undef UNBLOCK