#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "gdk/gdkkeysyms.h"

#include "color_notebook.h"
#include "image_render.h"
#include "dialog_handler.h"
#include "buildmenu.h"
#include "colormaps.h"
#include "color_area.h"
#include "general.h"
#include "gimpdnd.h"
#include "gimpui.h"

#include "libgimp/gimpintl.h"

/*  Add these features:
 *
 *  load/save colormaps
 *  requantize
 *  add color--by clicking in the checked region
 *  all changes need to flush colormap lookup cache
 */


/*  indexed palette routines  */
static void ipal_draw              (GimpColormapDialog *ipal);
static void ipal_clear             (GimpColormapDialog *ipal);
static void ipal_set_image         (GimpColormapDialog *ipal,
				    GimpImage          *gimage);
static void ipal_update_entries    (GimpColormapDialog *ipal);
static void ipal_set_index         (GimpColormapDialog *ipal,
				    gint                i);
static void ipal_draw_cell         (GimpColormapDialog *ipal,
				    gint                col);
static void ipal_update_image_list (GimpColormapDialog *ipal);


/*  indexed palette menu callbacks  */
static void ipal_add_callback    (GtkWidget *, gpointer);
static void ipal_edit_callback   (GtkWidget *, gpointer);
static void ipal_close_callback  (GtkWidget *, gpointer);
static void ipal_select_callback (gint, gint, gint, ColorNotebookState,
				  gpointer);

/*  event callback  */
static gint ipal_area_events (GtkWidget *, GdkEvent *, GimpColormapDialog *);

/*  create image menu  */
static void image_menu_callback (GtkWidget *, gpointer);
static GtkWidget * create_image_menu (GimpColormapDialog *,
				      GimpImage **,
				      gint *,
				      MenuItemCallback);
static void frame_size_alloc_cb (GtkFrame *frame, GtkAllocation *alloc,
				 GimpColormapDialog *ipal);
static void window_size_req_cb  (GtkWindow *win, GtkRequisition *req,
				 GimpColormapDialog *ipal);

static void index_adjustment_change_cb (GtkAdjustment *adjustment,
					GimpColormapDialog *ipal);
static void hex_entry_change_cb        (GtkEntry *entry,
					GimpColormapDialog *ipal);

static void set_addrem_cb        (GimpSet *set, GimpImage *image,
				  GimpColormapDialog *ipal);
static void image_rename_cb      (GimpImage *img, GimpColormapDialog *ipal);
static void image_cmap_change_cb (GimpImage *img, gint ncol,
				  GimpColormapDialog *ipal);
	       
/*  dnd stuff  */
static GtkTargetEntry color_palette_target_table[] =
{
  GIMP_TARGET_COLOR
};
static guint n_color_palette_targets = (sizeof (color_palette_target_table) /
					sizeof (color_palette_target_table[0]));

static void
palette_drag_color (GtkWidget *widget,
		    guchar    *r,
		    guchar    *g,
		    guchar    *b,
		    gpointer   data)
{
  GimpColormapDialog *ipal = (GimpColormapDialog *) data;
  guint col = ipal->dnd_col_index;
  GimpImage *gimage;

  gimage = ipal->image;

  *r = gimage->cmap[col * 3 + 0];
  *g = gimage->cmap[col * 3 + 1];
  *b = gimage->cmap[col * 3 + 2];
}

static void
palette_drop_color (GtkWidget *widget,
		    guchar     r,
		    guchar     g,
		    guchar     b,
		    gpointer   data)
{
  GimpColormapDialog *ipal = (GimpColormapDialog *) data;

  if (!GTK_WIDGET_IS_SENSITIVE (ipal->vbox) || 
      !(ipal->image->num_cols < 256))
    return;

  ipal->image->cmap[ipal->image->num_cols * 3 + 0] = r;
  ipal->image->cmap[ipal->image->num_cols * 3 + 1] = g;
  ipal->image->cmap[ipal->image->num_cols * 3 + 2] = b;
  ipal->image->num_cols++;
  gimp_image_colormap_changed (ipal->image, -1);
}

/**************************************/
/*  Public indexed palette functions  */
/**************************************/

#define COLORMAP_DIALOG_CREATE ipal_create

GimpColormapDialog *
ipal_create (GimpSet *context)
{
  GimpColormapDialog *ipal;
  GtkWidget *vbox;
  GtkWidget *frame;
  GtkWidget *util_box;
  GtkWidget *label;
  GtkWidget *arrow_hbox;
  GtkWidget *arrow;
  GtkWidget *ops_menu;
  GtkWidget *menu_bar;
  GtkWidget *menu_bar_item;
  GtkWidget *hbox;
  GtkWidget *hbox2;
  GtkWidget *entry;
  GtkWidget *evbox;
  GtkAccelGroup *accel_group;
  gint i;

  MenuItem indexed_color_ops[] =
  {
    { N_("Add"), 'N', GDK_CONTROL_MASK,
      ipal_add_callback, NULL, NULL, NULL },
    { N_("Edit"), 'E', GDK_CONTROL_MASK,
      ipal_edit_callback, NULL, NULL, NULL },
    { N_("Close"), 'W', GDK_CONTROL_MASK,
      ipal_close_callback, NULL, NULL, NULL },
    { NULL, 0, 0, NULL, NULL, NULL, NULL },
  };
  
  ipal = gtk_type_new (GIMP_TYPE_COLORMAP_DIALOG);

  /*  The action area  */
  gimp_dialog_create_action_area (GTK_DIALOG (ipal),

				  _("Close"), ipal_close_callback,
				  ipal, NULL, NULL, TRUE, TRUE,

				  NULL);

  ipal->image = NULL;
  ipal->context = context;
  ipal->cmap_changed_handler
    = gimp_set_add_handler (context, "colormap_changed",
			    image_cmap_change_cb, ipal);
  ipal->rename_handler
    = gimp_set_add_handler (context, "rename",
			    image_rename_cb, ipal);

  accel_group = gtk_accel_group_new ();
  gtk_window_set_wmclass (GTK_WINDOW (ipal), "indexed_color_palette", "Gimp");
  dialog_register (GTK_WIDGET (ipal));
  gtk_window_set_policy (GTK_WINDOW (ipal), TRUE, TRUE, TRUE); 
  gtk_window_set_title (GTK_WINDOW (ipal), _("Indexed Color Palette"));
  gtk_window_add_accel_group (GTK_WINDOW (ipal), accel_group);
  gtk_signal_connect (GTK_OBJECT (ipal), "delete_event",
		      GTK_SIGNAL_FUNC (gtk_widget_hide_on_delete),
		      NULL);
  
  ipal->vbox = vbox = gtk_vbox_new (FALSE, 2);
  gtk_container_set_border_width (GTK_CONTAINER (vbox), 2);
  gtk_container_add (GTK_CONTAINER (GTK_DIALOG (ipal)->vbox), vbox);
  
  /*  The hbox to hold the command menu and image option menu box  */
  util_box = gtk_hbox_new (FALSE, 4);
  gtk_box_pack_start (GTK_BOX (vbox), util_box, FALSE, FALSE, 0);

  /*  The GIMP image option menu  */
  label = gtk_label_new (_("Image:"));
  gtk_box_pack_start (GTK_BOX (util_box), label, FALSE, FALSE, 0);
  ipal->option_menu = GTK_OPTION_MENU (gtk_option_menu_new ());
  gtk_box_pack_start (GTK_BOX (util_box),
		      GTK_WIDGET (ipal->option_menu),
		      TRUE, TRUE, 0);
  
  /*  The indexed palette commands pulldown menu  */
  for (i = 0 ;i < sizeof (indexed_color_ops) / sizeof (indexed_color_ops[0]) ;i++)
    indexed_color_ops[i].user_data = ipal;

  ops_menu = build_menu (indexed_color_ops, accel_group);
  ipal->add_item = indexed_color_ops[0].widget;
  menu_bar = gtk_menu_bar_new ();
  gtk_box_pack_start (GTK_BOX (util_box), menu_bar, FALSE, FALSE, 0);

  menu_bar_item = gtk_menu_item_new ();
  gtk_container_add (GTK_CONTAINER (menu_bar), menu_bar_item);
  gtk_menu_item_set_submenu (GTK_MENU_ITEM (menu_bar_item), ops_menu);

  arrow_hbox = gtk_hbox_new (FALSE, 1);
  gtk_container_add (GTK_CONTAINER (menu_bar_item), arrow_hbox);

  label = gtk_label_new (_("Operations"));
  gtk_box_pack_start (GTK_BOX (arrow_hbox), label, FALSE, FALSE, 4);
  gtk_misc_set_alignment (GTK_MISC (label), 0.5, 0.5);

  arrow = gtk_arrow_new (GTK_ARROW_DOWN, GTK_SHADOW_OUT);
  gtk_box_pack_start (GTK_BOX (arrow_hbox), arrow, FALSE, FALSE, 0);
  gtk_misc_set_alignment (GTK_MISC (arrow), 0.5, 0.5);
  
  hbox2 = gtk_hbox_new (TRUE, 0);
  gtk_box_pack_start (GTK_BOX (vbox), hbox2, TRUE, TRUE, 0);

  /*  The palette frame  */
  evbox = gtk_event_box_new ();
  gtk_container_set_resize_mode (GTK_CONTAINER (evbox),
				 GTK_RESIZE_QUEUE); 
  gtk_widget_set_usize (GTK_WIDGET (evbox), -1, 60);
  gtk_signal_connect (GTK_OBJECT (evbox), "size_request",
		      GTK_SIGNAL_FUNC (window_size_req_cb),
		      ipal);
  gtk_signal_connect(GTK_OBJECT (evbox), "size_allocate",
		     GTK_SIGNAL_FUNC (frame_size_alloc_cb),
		     ipal);
  gtk_box_pack_start (GTK_BOX (hbox2), evbox, TRUE, TRUE, 0);

  frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
  gtk_container_add (GTK_CONTAINER (evbox), frame);
  ipal->palette = GTK_PREVIEW (gtk_preview_new (GTK_PREVIEW_COLOR));
  gtk_preview_size (ipal->palette, 256, 256);
  gtk_widget_set_events (GTK_WIDGET(ipal->palette), GDK_BUTTON_PRESS_MASK);
  ipal->event_handler =
    gtk_signal_connect (GTK_OBJECT (ipal->palette), "event",
			GTK_SIGNAL_FUNC (ipal_area_events),
			ipal);
  gtk_signal_handler_block (GTK_OBJECT (ipal->palette),
			    ipal->event_handler);

  gtk_container_add (GTK_CONTAINER (frame), GTK_WIDGET (ipal->palette));

  /*  dnd stuff  */
  gtk_drag_source_set (GTK_WIDGET (ipal->palette),
                       GDK_BUTTON1_MASK | GDK_BUTTON2_MASK,
                       color_palette_target_table, n_color_palette_targets,
                       GDK_ACTION_COPY | GDK_ACTION_MOVE);
  gimp_dnd_color_source_set (GTK_WIDGET (ipal->palette),
			     palette_drag_color, ipal);

  gtk_drag_dest_set (GTK_WIDGET (ipal->palette),
                     GTK_DEST_DEFAULT_HIGHLIGHT |
                     GTK_DEST_DEFAULT_MOTION |
                     GTK_DEST_DEFAULT_DROP,
                     color_palette_target_table, n_color_palette_targets,
                     GDK_ACTION_COPY);
  gimp_dnd_color_dest_set (GTK_WIDGET (ipal->palette),
			   palette_drop_color, ipal);

  /* some helpful hints */
  hbox = gtk_hbox_new (FALSE, 4);
  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);

  label = gtk_label_new (_("Index:"));
  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);

  ipal->index_spinbutton =
    gimp_spin_button_new ((GtkObject **) &ipal->index_adjustment,
			  0, 0, 0, 1, 10, 10, 1.0, 0);
  gtk_signal_connect (GTK_OBJECT (ipal->index_adjustment), "value_changed",
		      GTK_SIGNAL_FUNC (index_adjustment_change_cb),
		      ipal);
  gtk_box_pack_start (GTK_BOX (hbox), ipal->index_spinbutton, FALSE, FALSE, 0);

  label = gtk_label_new (_("Hex Triplet:"));
  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);

  entry = gtk_entry_new_with_max_length (7);
  ipal->color_entry = GTK_ENTRY (entry);
  gtk_signal_connect (GTK_OBJECT (entry), "activate",
		      GTK_SIGNAL_FUNC (hex_entry_change_cb),
		      ipal);
  gtk_box_pack_start (GTK_BOX (hbox), entry, FALSE, FALSE, 0);
  
  /*  Connect the "F1" help key  */
  gimp_help_connect_help_accel (GTK_WIDGET (ipal),
				gimp_standard_help_func,
				"dialogs/indexed_palette.html");

  gtk_widget_show_all (vbox);
  /* gtk_widget_show (ipal); */
  
  ipal_update_image_list (ipal);

  gtk_signal_connect (GTK_OBJECT (context), "add",
		      GTK_SIGNAL_FUNC (set_addrem_cb),
		      ipal);
  gtk_signal_connect (GTK_OBJECT (context), "remove",
		      GTK_SIGNAL_FUNC (set_addrem_cb),
		      ipal);

  return ipal;
}

static void
ipal_update_image_list (GimpColormapDialog* ipal)
{
  gint default_index;
  GimpImage *default_gimage;

  default_gimage = ipal->image;
  ipal->image_menu =
  create_image_menu (ipal,
		     &default_gimage,
		     &default_index,
		     image_menu_callback);
  gtk_option_menu_set_menu (ipal->option_menu, ipal->image_menu);
  
  if (default_index != -1)
    {
      if (! GTK_WIDGET_IS_SENSITIVE (ipal->vbox))
	gtk_widget_set_sensitive (ipal->vbox, TRUE);
      gtk_option_menu_set_history (ipal->option_menu, default_index);
    }
  else
    {
      if (GTK_WIDGET_IS_SENSITIVE (ipal->vbox))
	{
	  gtk_widget_set_sensitive (ipal->vbox, FALSE);
	}
    }
  ipal_set_image (ipal, default_gimage);
}

static void
frame_size_alloc_cb (GtkFrame           *frame,
		     GtkAllocation      *alloc,
		     GimpColormapDialog *ipal)
{
  GtkWidget *widget = GTK_WIDGET (frame);
  GtkAllocation allocation = *alloc;
  GtkRequisition requisition;

  if (ipal->image)
    ipal_draw (ipal);
  else
    ipal_clear (ipal);

  widget = GTK_BIN (widget)->child;
  gtk_widget_size_request (widget, &requisition);

  allocation.x      = MAX (0, allocation.width - requisition.width) / 2;
  allocation.y      = MAX (0, allocation.height - requisition.height) / 2;
  allocation.width  = MIN (allocation.width, requisition.width);
  allocation.height = MIN (allocation.height, requisition.height);

  gtk_widget_size_allocate (widget, &allocation);
}

static void
window_size_req_cb (GtkWindow          *window,
		    GtkRequisition     *requsition,
		    GimpColormapDialog *ipal)
{
  requsition->width = GTK_WIDGET (window)->allocation.width;
  requsition->height = GTK_WIDGET (window)->allocation.height;
}

#define MIN_CELL_SIZE 4

static void
ipal_draw (GimpColormapDialog* ipal)
{
  GimpImage *gimage;
  gint i, j, k, l, b;
  gint col;
  guchar *row;
  gint cellsize, ncol, xn, yn, width, height;
  GtkWidget *palette;
  GtkContainer *parent;

  g_return_if_fail (ipal);

  gimage = ipal->image;
  g_return_if_fail (gimage);

  palette = GTK_WIDGET (ipal->palette);
  parent = GTK_CONTAINER (palette->parent);
  width = GTK_WIDGET (parent)->allocation.width - parent->border_width;
  height = GTK_WIDGET (parent)->allocation.height - parent->border_width;
  ncol = gimage->num_cols;

  if (!ncol)
    {
      ipal_clear (ipal);
      return;
    }

  cellsize = sqrt(width * height / ncol);
  while (cellsize >= MIN_CELL_SIZE
	 && (xn = width/cellsize) * (yn = height/cellsize) < ncol)
    cellsize--;

  if (cellsize < MIN_CELL_SIZE)
    {
      cellsize = MIN_CELL_SIZE;
      xn = yn = ceil (sqrt (ncol));
    }

  yn = ((ncol + xn - 1) / xn);
  width = xn * cellsize;
  height = yn * cellsize;
  ipal->xn = xn;
  ipal->yn = yn;
  ipal->cellsize = cellsize;
  
  gtk_preview_size (ipal->palette, width, height);

  /*gtk_container_resize_children(GTK_WIDGET(parent)->parent);*/

  /*  req.width = width + parent->border_width;
  req.height = height + parent->border_width;
  gtk_widget_size_request(palette->parent, &req);*/
  /*gtk_widget_queue_resize (GTK_WIDGET(ipal));*/
  /*gtk_container_check_resize (GTK_WIDGET(parent)->parent);*/
  
  
  row = g_new (guchar, xn * cellsize * 3);
  col = 0;
  for (i = 0; i < yn; i++)
    {
      for (j = 0; j < xn && col < ncol; j++, col++)
	{
	  for (k = 0; k < cellsize; k++)
	    for (b = 0; b < 3; b++)
	      row[(j * cellsize + k) * 3 + b] = gimage->cmap[col * 3 + b];
	}

      for (k = 0; k < cellsize; k++)
	{
	  for (l = j * cellsize; l < xn * cellsize; l++)
	    for (b = 0; b < 3; b++)
	      row[l * 3 + b] = ((((i * cellsize + k) & 0x4) ? (l) : (l + 0x4)) & 0x4) ?
		blend_light_check[0] : blend_dark_check[0];

	  gtk_preview_draw_row (ipal->palette, row, 0,
				i * cellsize + k, cellsize * xn);
	}
    }
  ipal_draw_cell (ipal, ipal->col_index);

  g_free (row);
  gtk_widget_draw (palette, NULL);
}

static void
ipal_draw_cell (GimpColormapDialog *ipal,
		gint                col)
{
  guchar *row;
  gint cellsize, x, y, k;
  GdkRectangle rec;
  
  g_assert (ipal);
  g_assert (ipal->image);
  g_assert (col < ipal->image->num_cols);
  
  cellsize = ipal->cellsize;
  row = g_new(guchar, cellsize * 3);
  x = (col % ipal->xn) * cellsize;
  y = (col / ipal->xn) * cellsize;

  if (col == ipal->col_index)
    {
      for(k = 0; k < cellsize; k++)
	row[k*3] = row[k*3+1] = row[k*3+2] = (k & 1) * 255;
      gtk_preview_draw_row (ipal->palette, row, x, y, cellsize);

      if (!(cellsize & 1))
	for (k = 0; k < cellsize; k++)
	  row[k*3] = row[k*3+1] = row[k*3+2] = ((x+y+1) & 1) * 255;
      gtk_preview_draw_row (ipal->palette, row, x, y+cellsize-1, cellsize);

      row[0]=row[1]=row[2]=255;
      row[cellsize*3-3] = row[cellsize*3-2] = row[cellsize*3-1]
	= 255 * (cellsize & 1);
      for (k = 1; k < cellsize - 1; k++)
	{
	  row[k*3] = ipal->image->cmap[col * 3];
	  row[k*3+1] = ipal->image->cmap[col * 3 + 1];
	  row[k*3+2] = ipal->image->cmap[col * 3 + 2];
	}
      for (k = 1; k < cellsize - 1; k+=2)
	gtk_preview_draw_row (ipal->palette, row, x, y+k, cellsize);

      row[0] = row[1] = row[2] = 0;
      row[cellsize*3-3] = row[cellsize*3-2] = row[cellsize*3-1]
	= 255 * ((cellsize+1) & 1);
      for (k = 2; k < cellsize - 1; k += 2)
	gtk_preview_draw_row (ipal->palette, row, x, y+k, cellsize);
    }
  else
    {
      for (k = 0; k < cellsize; k++)
	{
	  row[k*3] = ipal->image->cmap[col * 3];
	  row[k*3+1] = ipal->image->cmap[col * 3 + 1];
	  row[k*3+2] = ipal->image->cmap[col * 3 + 2];
	}
      for (k = 0; k < cellsize; k++)
	gtk_preview_draw_row (ipal->palette, row, x, y+k, cellsize);
    }
  rec.x = x;
  rec.y = y;
  rec.width = rec.height = cellsize;
  gtk_widget_draw (GTK_WIDGET (ipal->palette), &rec);
}
    
static void
ipal_clear (GimpColormapDialog* ipal)
{
  gint i, j;
  gint offset;
  gint width, height;
  guchar *row = NULL;
  GtkWidget *palette;

  g_return_if_fail (ipal);

  palette = GTK_WIDGET (ipal->palette);

  /* Watch out for negative values (at least on Win32) */
  width = (int) (gint16) palette->allocation.width;
  height = (int) (gint16) palette->allocation.height;
  if (width > 0)
    row = g_new (guchar, width * 3);

  gtk_preview_size (ipal->palette, width, height);

  for (i = 0; i < height; i += 4)
    {
      offset = (i & 0x4) ? 0x4 : 0x0;

      for (j = 0; j < width; j++)
	{
	  row[j * 3 + 0] = row[j * 3 + 1] = row[j * 3 + 2] =
	    ((j + offset) & 0x4) ? blend_light_check[0] : blend_dark_check[0];
	}

      for (j = 0; j < 4 && i+j < height; j++)
	gtk_preview_draw_row (ipal->palette, row, 0, i + j, width);
    }
  if (width > 0)
    g_free (row);
  gtk_widget_draw (palette, NULL);
}

static void
ipal_update_entries (GimpColormapDialog *ipal)
{
  if (!ipal->image)
    {
      gtk_widget_set_sensitive (ipal->index_spinbutton, FALSE);
      gtk_widget_set_sensitive (GTK_WIDGET (ipal->color_entry), FALSE);
      gtk_adjustment_set_value (ipal->index_adjustment, 0);
      gtk_entry_set_text (ipal->color_entry, "");
    }
  else
    {
      gchar *string;
      guchar *col;

      gtk_adjustment_set_value (ipal->index_adjustment, ipal->col_index);

      col = &ipal->image->cmap[ipal->col_index * 3];
      string = g_strdup_printf ("#%02x%02x%02x", col[0], col[1], col[2]);
      gtk_entry_set_text (ipal->color_entry, string);
      g_free (string);
      gtk_widget_set_sensitive (ipal->index_spinbutton, TRUE);
      gtk_widget_set_sensitive (GTK_WIDGET (ipal->color_entry), TRUE);
    }
}

static void
ipal_set_index (GimpColormapDialog *ipal,
		gint                i)
{
  if (i != ipal->col_index)
    {
      gint old = ipal->col_index;
      ipal->col_index     = i;
      ipal->dnd_col_index = i;
      ipal_draw_cell (ipal, old);
      ipal_draw_cell (ipal, i);
      ipal_update_entries (ipal);
    }
}

static void
index_adjustment_change_cb (GtkAdjustment      *adjustment,
			    GimpColormapDialog *ipal)
{
  g_return_if_fail (ipal);

  if (!ipal->image)
    return;

  ipal_set_index (ipal, (gint) (adjustment->value + 0.5));

  ipal_update_entries (ipal);
}

static void
hex_entry_change_cb (GtkEntry           *entry,
		     GimpColormapDialog *ipal)
{
  gchar *s;
  gulong i;

  g_return_if_fail (ipal);
  g_return_if_fail (ipal->image);

  s = gtk_entry_get_text (entry);

  if (sscanf (s, "#%lx", &i))
    {
      guchar *c = &ipal->image->cmap[3 * ipal->col_index];
      c[0] = (i & 0xFF0000) >> 16;
      c[1] = (i & 0x00FF00) >> 8;
      c[2] = (i & 0x0000FF);
      gimp_image_colormap_changed (ipal->image, ipal->col_index);
    }
  
  ipal_update_entries (ipal);
}

static void
set_addrem_cb (GimpSet            *set,
	       GimpImage          *image,
	       GimpColormapDialog *ipal)
{
  ipal_update_image_list (ipal);
}	

static void
image_rename_cb (GimpImage          *img,
		 GimpColormapDialog *ipal)
{
  ipal_update_image_list (ipal);
}

static void
image_cmap_change_cb (GimpImage          *img,
		      gint                ncol,
		      GimpColormapDialog *ipal)
{
  if (img == ipal->image && gimp_image_base_type (img) == INDEXED)
    {
      if (ncol < 0)
	{
	  ipal_draw (ipal);
	  gtk_container_queue_resize (GTK_CONTAINER (ipal));
	}
      else
	{
	  ipal_draw_cell (ipal, ncol);
	}

      if (ncol == ipal->col_index)
	ipal_update_entries (ipal);

      gtk_widget_set_sensitive (ipal->add_item, (img->num_cols < 256));

      if ((ipal->index_adjustment->upper + 1) < img->num_cols)
	{
	  ipal->index_adjustment->upper = img->num_cols - 1;
	  gtk_adjustment_changed (ipal->index_adjustment);
	}
    }
  else
    {
      ipal_update_image_list (ipal);
    }

  gdisplays_flush_now ();
}
	       
static void
ipal_set_image (GimpColormapDialog *ipal,
		GimpImage          *gimage)
{
  g_assert (ipal);

  if (ipal->image)
    {
      ipal->image = gimage;

      if (!gimage)
	{
	  gtk_signal_handler_block (GTK_OBJECT (ipal->palette),
				    ipal->event_handler);
	  if (GTK_WIDGET_MAPPED (GTK_WIDGET (ipal)))
	    ipal_clear (ipal);
	}
    }

  if (gimage)
    {
      if (!ipal->image)
	gtk_signal_handler_unblock (GTK_OBJECT (ipal->palette),
				    ipal->event_handler);
      g_return_if_fail (gimp_set_have (ipal->context, gimage));
      g_return_if_fail (gimage_base_type (gimage) == INDEXED);
      ipal->image = gimage;
      ipal_draw (ipal);
      gtk_container_queue_resize (GTK_CONTAINER (ipal));
      ipal->index_adjustment->upper = ipal->image->num_cols - 1;
      gtk_adjustment_changed (ipal->index_adjustment);
    }
  else
    {
      if (ipal->color_notebook)
	color_notebook_hide (ipal->color_notebook);
      ipal->index_adjustment->upper = 0;
      gtk_adjustment_changed (ipal->index_adjustment);
    }
  
  ipal->col_index     = 0;
  ipal->dnd_col_index = 0;
  gtk_widget_set_sensitive (ipal->add_item,
			    (gimage && gimage->num_cols < 256));
  ipal_update_entries (ipal);
}

static void
ipal_add_callback (GtkWidget *widget,
		   gpointer   data)
{
  GimpColormapDialog *ipal = data;

  g_return_if_fail (ipal);
  g_return_if_fail (ipal->image->num_cols < 256);

  memcpy (&ipal->image->cmap[ipal->image->num_cols * 3],
	  &ipal->image->cmap[ipal->col_index * 3],
	  3);
  ipal->image->num_cols++;

  gimp_image_colormap_changed (ipal->image, -1);
}

static void
ipal_edit_callback (GtkWidget *widget,
		    gpointer   data)
{
  GimpColormapDialog* ipal = data;
  guchar r, g, b;

  g_return_if_fail (ipal);

  r = ipal->image->cmap[ipal->col_index*3];
  g = ipal->image->cmap[ipal->col_index*3+1];
  b = ipal->image->cmap[ipal->col_index*3+2];

  if (! ipal->color_notebook)
    {
      ipal->color_notebook
	= color_notebook_new (r, g, b,
			      ipal_select_callback, ipal, FALSE);
    }
  else
    {
      color_notebook_show (ipal->color_notebook);
      color_notebook_set_color (ipal->color_notebook, r, g, b, 1);
    }
}

static void
ipal_close_callback (GtkWidget *widget,
		     gpointer   data)
{
  GimpColormapDialog* ipal = data;

  g_assert (ipal);

  gtk_widget_hide (GTK_WIDGET (ipal));
}

static void
ipal_select_callback (gint                r,
		      gint                g,
		      gint                b,
		      ColorNotebookState  state,
		      gpointer            data)
{
  GimpImage *gimage;
  GimpColormapDialog *ipal = data;
  
  g_return_if_fail (ipal);
  g_return_if_fail (ipal->image);
  g_return_if_fail (ipal->color_notebook);

  gimage = ipal->image;

  switch (state)
    {
    case COLOR_NOTEBOOK_UPDATE:
      break;
    case COLOR_NOTEBOOK_OK:
      gimage->cmap[ipal->col_index * 3 + 0] = r;
      gimage->cmap[ipal->col_index * 3 + 1] = g;
      gimage->cmap[ipal->col_index * 3 + 2] = b;
      gimp_image_colormap_changed (gimage, ipal->col_index);
      /* Fall through */
    case COLOR_NOTEBOOK_CANCEL:
      color_notebook_hide (ipal->color_notebook);
    }
}

static gint
ipal_area_events (GtkWidget          *widget,
		  GdkEvent           *event,
		  GimpColormapDialog *ipal)
{
  GimpImage *gimage;
  GdkEventButton *bevent;
  guchar r, g, b;
  guint col;

  g_assert (ipal);

  gimage = ipal->image;
  g_assert (gimage);

  switch (event->type)
    {
    case GDK_BUTTON_PRESS:
      bevent = (GdkEventButton *) event;

      if (bevent->button < 1 || bevent->button > 3)
	return FALSE;

      if (!(bevent->y < ipal->cellsize * ipal->yn
	    && bevent->x < ipal->cellsize * ipal->xn))
	return FALSE;

      col = ipal->xn * ((int)bevent->y / ipal->cellsize)
	+ ((int)bevent->x / ipal->cellsize);

      if (col >= ipal->image->num_cols)
	return FALSE;

      r = gimage->cmap[col * 3 + 0];
      g = gimage->cmap[col * 3 + 1];
      b = gimage->cmap[col * 3 + 2];

      switch (bevent->button)
	{
	case 1:
	  ipal_set_index (ipal, col);
	  gimp_colormap_dialog_selected (ipal);
	  break;

	case 2:
	  ipal->dnd_col_index = col;
	  break;

	case 3:
	  ipal_set_index (ipal, col);
	  if (! ipal->color_notebook)
	    {
	      ipal->color_notebook
		= color_notebook_new (r, g, b,
				      ipal_select_callback, ipal, FALSE);
	    }
	  else
	    {
	      color_notebook_show (ipal->color_notebook);
	      color_notebook_set_color (ipal->color_notebook, r, g, b, 1);
	    }
	  break;

	default:
	  break;
	}
      break;

    default:
      break;
    }

  return FALSE;
}

static void
image_menu_callback (GtkWidget *widget,
		     gpointer   data)
{
  GimpColormapDialog* ipal = gtk_object_get_data (GTK_OBJECT (widget),
						  "colormap_dialog");
  GimpImage* image = GIMP_IMAGE (data);

  g_assert (ipal);
  g_assert (image);

  ipal_set_image (ipal, image);
}

typedef struct
{
  GimpImage          **def;
  gint                *default_index;
  MenuItemCallback     callback;
  GtkWidget           *menu;
  gint                 num_items;
  GimpImage           *id;
  GimpColormapDialog  *ipal;
} IMCBData;

static void
create_image_menu_cb (gpointer im,
		      gpointer d)
{
  GimpImage* gimage = GIMP_IMAGE (im);
  IMCBData* data = (IMCBData *) d;
  gchar* image_name;
  gchar* menu_item_label;
  GtkWidget *menu_item;

  if (gimage_base_type (gimage) != INDEXED)
    return;

  /*  make sure the default index gets set to _something_, if possible  */
  if (*data->default_index == -1)
    {
      data->id = gimage;
      *data->default_index = data->num_items;
    }

  if (gimage == *data->def)
    {
      data->id = *data->def;
      *data->default_index = data->num_items;
    }

  image_name = g_basename (gimage_filename (gimage));
  menu_item_label = g_strdup_printf ("%s-%d", image_name, 
                                     pdb_image_to_id (gimage));
  menu_item = gtk_menu_item_new_with_label (menu_item_label);
  gtk_object_set_data (GTK_OBJECT (menu_item), "colormap_dialog", data->ipal);
  gtk_signal_connect (GTK_OBJECT (menu_item), "activate",
		      (GtkSignalFunc) data->callback,
		      gimage);
  gtk_container_add (GTK_CONTAINER (data->menu), menu_item);
  gtk_widget_show (menu_item);

  g_free (menu_item_label);
  data->num_items ++;  
}

static GtkWidget *
create_image_menu (GimpColormapDialog  *ipal,
		   GimpImage          **def,
		   gint                *default_index,
		   MenuItemCallback     callback)
{
  IMCBData data;

  data.def = def;
  data.default_index = default_index;
  data.callback = callback;
  data.menu = gtk_menu_new ();
  data.num_items = 0;
  data.id = NULL;
  data.ipal = ipal;

  *default_index = -1;

  gimp_set_foreach (ipal->context, create_image_menu_cb, &data);

  if (!data.num_items)
    {
      GtkWidget* menu_item;
      menu_item = gtk_menu_item_new_with_label (_("none"));
      gtk_container_add (GTK_CONTAINER (data.menu), menu_item);
      gtk_widget_show (menu_item);
    }

  *def = data.id;

  return data.menu;
}