/* LIBGIMP - The GIMP Library
 * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
 *
 * gimpitemcombobox.c
 * Copyright (C) 2004 Sven Neumann <sven@gimp.org>
 * Copyright (C) 2006 Simon Budig <simon@gimp.org>
 *
 * This library 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 3 of the License, or (at your option) any later version.
 *
 * This library 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 this library.  If not, see
 * <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <stdlib.h>

#include <gtk/gtk.h>

#include "libgimpwidgets/gimpwidgets.h"

#include "gimp.h"

#include "gimpuitypes.h"
#include "gimpitemcombobox.h"
#include "gimppixbuf.h"


/**
 * SECTION: gimpitemcombobox
 * @title: GimpItemComboBox
 * @short_description: Widgets providing popup menus of items.
 *
 * Widgets providing popup menus of items (layers, channels,
 * drawables, vectors).
 **/


#define THUMBNAIL_SIZE  24
#define WIDTH_REQUEST  200

typedef enum
{
  DRAWABLE_COMBO_BOX,
  CHANNEL_COMBO_BOX,
  LAYER_COMBO_BOX,
  VECTORS_COMBO_BOX
} GimpComboBoxType;


typedef struct _GimpDrawableComboBoxClass GimpDrawableComboBoxClass;
typedef struct _GimpChannelComboBoxClass  GimpChannelComboBoxClass;
typedef struct _GimpLayerComboBoxClass    GimpLayerComboBoxClass;
typedef struct _GimpVectorsComboBoxClass  GimpVectorsComboBoxClass;

struct _GimpDrawableComboBox
{
  GimpIntComboBox  parent_instance;
};

struct _GimpDrawableComboBoxClass
{
  GimpIntComboBoxClass  parent_class;
};

struct _GimpChannelComboBox
{
  GimpIntComboBox  parent_instance;
};

struct _GimpChannelComboBoxClass
{
  GimpIntComboBoxClass  parent_class;
};

struct _GimpLayerComboBox
{
  GimpIntComboBox  parent_instance;
};

struct _GimpLayerComboBoxClass
{
  GimpIntComboBoxClass  parent_class;
};

struct _GimpVectorsComboBox
{
  GimpIntComboBox  parent_instance;
};

struct _GimpVectorsComboBoxClass
{
  GimpIntComboBoxClass  parent_class;
};


static GtkWidget * gimp_item_combo_box_new (GimpComboBoxType            type,
                                            GimpItemConstraintFunc      constraint,
                                            gpointer                    data);

static void  gimp_item_combo_box_model_add (GtkListStore               *store,
                                            gint32                      image,
                                            gint                        num_items,
                                            gint32                     *items,
                                            GimpComboBoxType            type,
                                            GimpItemConstraintFunc      constraint,
                                            gpointer                    data);

static void  gimp_item_combo_box_drag_data_received (GtkWidget         *widget,
                                                     GdkDragContext    *context,
                                                     gint               x,
                                                     gint               y,
                                                     GtkSelectionData  *selection,
                                                     guint              info,
                                                     guint              time);


static const GtkTargetEntry targets[] =
{
  { "application/x-gimp-channel-id", 0 },
  { "application/x-gimp-layer-id",   0 },
  { "application/x-gimp-vectors-id", 0 }
};


G_DEFINE_TYPE (GimpDrawableComboBox, gimp_drawable_combo_box,
               GIMP_TYPE_INT_COMBO_BOX)


static void
gimp_drawable_combo_box_class_init (GimpDrawableComboBoxClass *klass)
{
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);

  widget_class->drag_data_received = gimp_item_combo_box_drag_data_received;
}

static void
gimp_drawable_combo_box_init (GimpDrawableComboBox *combo_box)
{
  gtk_drag_dest_set (GTK_WIDGET (combo_box),
                     GTK_DEST_DEFAULT_HIGHLIGHT |
                     GTK_DEST_DEFAULT_MOTION |
                     GTK_DEST_DEFAULT_DROP,
                     targets, 2,
                     GDK_ACTION_COPY);
}

/**
 * gimp_drawable_combo_box_new:
 * @constraint: a #GimpDrawableConstraintFunc or %NULL
 * @data:       a pointer that is passed to @constraint
 *
 * Creates a new #GimpIntComboBox filled with all currently opened
 * drawables. If a @constraint function is specified, it is called for
 * each drawable and only if the function returns %TRUE, the drawable
 * is added to the combobox.
 *
 * You should use gimp_int_combo_box_connect() to initialize and connect
 * the combo.  Use gimp_int_combo_box_set_active() to get the active
 * drawable ID and gimp_int_combo_box_get_active() to retrieve the ID
 * of the selected drawable.
 *
 * Return value: a new #GimpIntComboBox.
 *
 * Since: GIMP 2.2
 **/
GtkWidget *
gimp_drawable_combo_box_new (GimpDrawableConstraintFunc constraint,
                             gpointer                   data)
{
  return gimp_item_combo_box_new (DRAWABLE_COMBO_BOX, constraint, data);
}


G_DEFINE_TYPE(GimpChannelComboBox,
              gimp_channel_combo_box,
              GIMP_TYPE_INT_COMBO_BOX);

static void
gimp_channel_combo_box_class_init (GimpChannelComboBoxClass *klass)
{
  GtkWidgetClass *widget_class;

  widget_class = GTK_WIDGET_CLASS (klass);

  widget_class->drag_data_received = gimp_item_combo_box_drag_data_received;
}

static void
gimp_channel_combo_box_init (GimpChannelComboBox *combo_box)
{
  gtk_drag_dest_set (GTK_WIDGET (combo_box),
                     GTK_DEST_DEFAULT_HIGHLIGHT |
                     GTK_DEST_DEFAULT_MOTION |
                     GTK_DEST_DEFAULT_DROP,
                     targets, 1,
                     GDK_ACTION_COPY);
}

/**
 * gimp_channel_combo_box_new:
 * @constraint: a #GimpDrawableConstraintFunc or %NULL
 * @data:       a pointer that is passed to @constraint
 *
 * Creates a new #GimpIntComboBox filled with all currently opened
 * channels. See gimp_drawable_combo_box_new() for more information.
 *
 * Return value: a new #GimpIntComboBox.
 *
 * Since: GIMP 2.2
 **/
GtkWidget *
gimp_channel_combo_box_new (GimpDrawableConstraintFunc constraint,
                            gpointer                   data)
{
  return gimp_item_combo_box_new (CHANNEL_COMBO_BOX, constraint, data);
}


G_DEFINE_TYPE(GimpLayerComboBox,
              gimp_layer_combo_box,
              GIMP_TYPE_INT_COMBO_BOX);

static void
gimp_layer_combo_box_class_init (GimpLayerComboBoxClass *klass)
{
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);

  widget_class->drag_data_received = gimp_item_combo_box_drag_data_received;
}

static void
gimp_layer_combo_box_init (GimpLayerComboBox *combo_box)
{
  gtk_drag_dest_set (GTK_WIDGET (combo_box),
                     GTK_DEST_DEFAULT_HIGHLIGHT |
                     GTK_DEST_DEFAULT_MOTION |
                     GTK_DEST_DEFAULT_DROP,
                     targets + 1, 1,
                     GDK_ACTION_COPY);
}

/**
 * gimp_layer_combo_box_new:
 * @constraint: a #GimpDrawableConstraintFunc or %NULL
 * @data:       a pointer that is passed to @constraint
 *
 * Creates a new #GimpIntComboBox filled with all currently opened
 * layers. See gimp_drawable_combo_box_new() for more information.
 *
 * Return value: a new #GimpIntComboBox.
 *
 * Since: GIMP 2.2
 **/
GtkWidget *
gimp_layer_combo_box_new (GimpDrawableConstraintFunc constraint,
                          gpointer                   data)
{
  return gimp_item_combo_box_new (LAYER_COMBO_BOX, constraint, data);
}


G_DEFINE_TYPE (GimpVectorsComboBox, gimp_vectors_combo_box,
               GIMP_TYPE_INT_COMBO_BOX)

static void
gimp_vectors_combo_box_class_init (GimpVectorsComboBoxClass *klass)
{
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);

  widget_class->drag_data_received = gimp_item_combo_box_drag_data_received;
}

static void
gimp_vectors_combo_box_init (GimpVectorsComboBox *combo_box)
{
  gtk_drag_dest_set (GTK_WIDGET (combo_box),
                     GTK_DEST_DEFAULT_HIGHLIGHT |
                     GTK_DEST_DEFAULT_MOTION |
                     GTK_DEST_DEFAULT_DROP,
                     targets + 2, 1,
                     GDK_ACTION_COPY);
}

/**
 * gimp_vectors_combo_box_new:
 * @constraint: a #GimpVectorsConstraintFunc or %NULL
 * @data:       a pointer that is passed to @constraint
 *
 * Creates a new #GimpIntComboBox filled with all currently opened
 * vectors objects. If a @constraint function is specified, it is called for
 * each vectors object and only if the function returns %TRUE, the vectors
 * object is added to the combobox.
 *
 * You should use gimp_int_combo_box_connect() to initialize and connect
 * the combo.  Use gimp_int_combo_box_set_active() to set the active
 * vectors ID and gimp_int_combo_box_get_active() to retrieve the ID
 * of the selected vectors object.
 *
 * Return value: a new #GimpIntComboBox.
 *
 * Since: GIMP 2.4
 **/
GtkWidget *
gimp_vectors_combo_box_new (GimpVectorsConstraintFunc constraint,
                            gpointer                  data)
{
  return gimp_item_combo_box_new (VECTORS_COMBO_BOX, constraint, data);
}


static GtkWidget *
gimp_item_combo_box_new (GimpComboBoxType       type,
                         GimpItemConstraintFunc constraint,
                         gpointer               data)
{
  GType         combo_box_type = G_TYPE_NONE;
  GtkWidget    *combo_box;
  GtkTreeModel *model;
  GtkTreeIter   iter;
  gint32       *images;
  gint          num_images;
  gint          i;

  switch (type)
    {
    case DRAWABLE_COMBO_BOX:
      combo_box_type = GIMP_TYPE_DRAWABLE_COMBO_BOX;
      break;
    case CHANNEL_COMBO_BOX:
      combo_box_type = GIMP_TYPE_CHANNEL_COMBO_BOX;
      break;
    case LAYER_COMBO_BOX:
      combo_box_type = GIMP_TYPE_LAYER_COMBO_BOX;
      break;
    case VECTORS_COMBO_BOX:
      combo_box_type = GIMP_TYPE_VECTORS_COMBO_BOX;
      break;
    }

  combo_box = g_object_new (combo_box_type,
                            "width-request", WIDTH_REQUEST,
                            "ellipsize",     PANGO_ELLIPSIZE_MIDDLE,
                            NULL);

  model = gtk_combo_box_get_model (GTK_COMBO_BOX (combo_box));

  images = gimp_image_list (&num_images);

  for (i = 0; i < num_images; i++)
    {
      gint32 *items;
      gint    num_items;

      if (type == DRAWABLE_COMBO_BOX ||
          type == LAYER_COMBO_BOX)
        {
          items = gimp_image_get_layers (images[i], &num_items);
          gimp_item_combo_box_model_add (GTK_LIST_STORE (model),
                                         images[i],
                                         num_items, items, type,
                                         constraint, data);
          g_free (items);
        }

      if (type == DRAWABLE_COMBO_BOX ||
          type == CHANNEL_COMBO_BOX)
        {
          items = gimp_image_get_channels (images[i], &num_items);
          gimp_item_combo_box_model_add (GTK_LIST_STORE (model),
                                         images[i],
                                         num_items, items, type,
                                         constraint, data);
          g_free (items);
        }

      if (type == VECTORS_COMBO_BOX)
        {
          items = gimp_image_get_vectors (images[i], &num_items);
          gimp_item_combo_box_model_add (GTK_LIST_STORE (model),
                                         images[i],
                                         num_items, items, type,
                                         constraint, data);
          g_free (items);
        }
    }

  g_free (images);

  if (gtk_tree_model_get_iter_first (model, &iter))
    gtk_combo_box_set_active_iter (GTK_COMBO_BOX (combo_box), &iter);

  return combo_box;
}


static void
gimp_item_combo_box_model_add (GtkListStore           *store,
                               gint32                  image,
                               gint                    num_items,
                               gint32                 *items,
                               GimpComboBoxType        type,
                               GimpItemConstraintFunc  constraint,
                               gpointer                data)
{
  GtkTreeIter  iter;
  gint         i;

  for (i = 0; i < num_items; i++)
    {
      if (! constraint || (* constraint) (image, items[i], data))
        {
          gchar     *image_name = gimp_image_get_name (image);
          gchar     *item_name  = gimp_item_get_name (items[i]);
          gchar     *label;
          GdkPixbuf *thumb;

          label = g_strdup_printf ("%s-%d/%s-%d",
                                   image_name, image,
                                   item_name, items[i]);

          g_free (item_name);
          g_free (image_name);

          if (type == VECTORS_COMBO_BOX)
            thumb = NULL;
          else
            thumb = gimp_drawable_get_thumbnail (items[i],
                                                 THUMBNAIL_SIZE, THUMBNAIL_SIZE,
                                                 GIMP_PIXBUF_SMALL_CHECKS);

          gtk_list_store_append (store, &iter);
          gtk_list_store_set (store, &iter,
                              GIMP_INT_STORE_VALUE,  items[i],
                              GIMP_INT_STORE_LABEL,  label,
                              GIMP_INT_STORE_PIXBUF, thumb,
                              -1);

          if (thumb)
            g_object_unref (thumb);

          g_free (label);
        }
    }
}

static void
gimp_item_combo_box_drag_data_received (GtkWidget        *widget,
                                        GdkDragContext   *context,
                                        gint              x,
                                        gint              y,
                                        GtkSelectionData *selection,
                                        guint             info,
                                        guint             time)
{
  gint   length = gtk_selection_data_get_length (selection);
  gchar *str;

  if (gtk_selection_data_get_format (selection) != 8 || length < 1)
    {
      g_warning ("%s: received invalid item ID data", G_STRFUNC);
      return;
    }

  str = g_strndup ((const gchar *) gtk_selection_data_get_data (selection),
                   length);

  if (g_utf8_validate (str, -1, NULL))
    {
      gint pid;
      gint ID;

      if (sscanf (str, "%i:%i", &pid, &ID) == 2 &&
          pid == gimp_getpid ())
        {
          gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (widget), ID);
        }
    }

  g_free (str);
}