gimp/app/brush_select.c

/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * 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 <string.h>
#include "appenv.h"
#include "actionarea.h"
#include "gimpbrushlist.h"
#include "gimplist.h"
#include "gimpbrushgenerated.h"
#include "brush_edit.h"
#include "brush_select.h"
#include "colormaps.h"
#include "disp_callbacks.h"
#include "errors.h"
#include "paint_options.h"
#include "session.h"

#include "libgimp/gimpintl.h"

#define MIN_CELL_SIZE     24
#define MAX_CELL_SIZE     24  /*  disable variable brush preview size  */ 

#define STD_BRUSH_COLUMNS 5
#define STD_BRUSH_ROWS    5

/* how long to wait after mouse-down before showing pattern popup */
#define POPUP_DELAY_MS      150

#define MAX_WIN_WIDTH(bsp)     (MIN_CELL_SIZE * ((bsp)->NUM_BRUSH_COLUMNS))
#define MAX_WIN_HEIGHT(bsp)    (MIN_CELL_SIZE * ((bsp)->NUM_BRUSH_ROWS))
#define MARGIN_WIDTH      3
#define MARGIN_HEIGHT     3

#define BRUSH_EVENT_MASK  GDK_EXPOSURE_MASK | \
                          GDK_BUTTON_PRESS_MASK | \
			  GDK_BUTTON_RELEASE_MASK | \
                          GDK_BUTTON1_MOTION_MASK | \
			  GDK_ENTER_NOTIFY_MASK

/*  local function prototypes  */
static void brush_popup_open             (BrushSelectP, int, int, GimpBrushP);
static void brush_popup_close            (BrushSelectP);
static void display_brush                (BrushSelectP, GimpBrushP, int, int);
static void display_brushes              (BrushSelectP);
static void display_setup                (BrushSelectP);
static void preview_calc_scrollbar       (BrushSelectP);
static void brush_select_show_selected   (BrushSelectP, int, int);
static void update_active_brush_field    (BrushSelectP);
static gint edit_brush_callback		(GtkWidget *w, GdkEvent *e,
					 gpointer data);
static gint new_brush_callback		(GtkWidget *w, GdkEvent *e,
					 gpointer data);
static gint brush_select_brush_dirty_callback(GimpBrushP brush,
					      BrushSelectP bsp);
static void connect_signals_to_brush    (GimpBrushP brush, 
					 BrushSelectP bsp);
static void disconnect_signals_from_brush(GimpBrushP brush,
					  BrushSelectP bsp);
static void brush_added_callback     (GimpBrushList *list,
				      GimpBrushP brush,
				      BrushSelectP bsp);
static void brush_removed_callback   (GimpBrushList *list,
				      GimpBrushP brush,
				      BrushSelectP bsp);
/* static void brush_select_map_callback    (GtkWidget *, BrushSelectP); */
static void brush_select_close_callback  (GtkWidget *, gpointer);
static void brush_select_refresh_callback(GtkWidget *, gpointer);
static void paint_mode_menu_callback     (GtkWidget *, gpointer);
static gint brush_select_events          (GtkWidget *, GdkEvent *, BrushSelectP);
static gint brush_select_resize		 (GtkWidget *, GdkEvent *, BrushSelectP);

static gint brush_select_delete_callback        (GtkWidget *, GdkEvent *, gpointer);
static void preview_scroll_update         (GtkAdjustment *, gpointer);
static void opacity_scale_update          (GtkAdjustment *, gpointer);
static void spacing_scale_update          (GtkAdjustment *, gpointer);


/*  local variables  */

/*  List of active dialogs  */
GSList *brush_active_dialogs = NULL;

/*  Brush editor dialog (main brush dialog only)  */
static BrushEditGeneratedWindow *brush_edit_generated_dialog;


/*  If title == NULL then it is the main brush dialog  */
BrushSelectP
brush_select_new (gchar   *title,
		  /*  These are the required initial vals
		   *  If init_name == NULL then use current brush
		   */
		  gchar   *init_name,
		  gdouble  init_opacity,
		  gint     init_spacing,
		  gint     init_mode)
{
  BrushSelectP bsp;
  GtkWidget *vbox;
  GtkWidget *hbox;
  GtkWidget *frame;
  GtkWidget *sbar;
  GtkWidget *label;
  GtkWidget *sep;
  GtkWidget *table;
  GtkWidget *abox;
  GtkWidget *util_box;
  GtkWidget *option_menu;
  GtkWidget *menu;
  GtkWidget *slider;
  GtkWidget *button2;

  GimpBrushP active = NULL;
  gint gotinitbrush = FALSE;

  static ActionAreaItem action_items[] =
  {
    { N_("Refresh"), brush_select_refresh_callback, NULL, NULL },
    { N_("Close"), brush_select_close_callback, NULL, NULL }
  };

  bsp = g_malloc (sizeof (_BrushSelect));
  bsp->redraw = TRUE;
  bsp->scroll_offset = 0;
  bsp->callback_name = 0;
  bsp->old_row = bsp->old_col = 0;
  bsp->brush = NULL; /* NULL -> main dialog window */
  bsp->brush_popup = NULL;
  bsp->popup_timeout_tag = 0;
  bsp->NUM_BRUSH_COLUMNS = STD_BRUSH_COLUMNS;
  bsp->NUM_BRUSH_ROWS = STD_BRUSH_ROWS;

  /*  The shell and main vbox  */
  bsp->shell = gtk_dialog_new ();
  gtk_window_set_wmclass (GTK_WINDOW (bsp->shell), "brushselection", "Gimp");

  if (!title)
    {
      gtk_window_set_title (GTK_WINDOW (bsp->shell), _("Brush Selection"));

      /*  set dialog's size later because weird thing will happen if the
       *  size was not saved in the current paint options mode
       */
      session_set_window_geometry (bsp->shell, &brush_select_session_info,
				   FALSE);
    }
  else
    {
      gtk_window_set_title (GTK_WINDOW (bsp->shell), title);
      if (init_name && strlen (init_name))
	active = gimp_brush_list_get_brush (brush_list, init_name);
      if (active)
	gotinitbrush = TRUE;
    }

  gtk_window_set_policy (GTK_WINDOW (bsp->shell), FALSE, TRUE, FALSE);

  /*  Handle the wm close signal  */
  gtk_signal_connect (GTK_OBJECT (bsp->shell), "delete_event",
		      GTK_SIGNAL_FUNC (brush_select_delete_callback),
		      bsp);

  /*  The main vbox  */
  vbox = gtk_vbox_new (FALSE, 0);
  gtk_container_set_border_width (GTK_CONTAINER (vbox), 2);
  gtk_container_add (GTK_CONTAINER (GTK_DIALOG (bsp->shell)->vbox), vbox);

  /*  The horizontal box containing the brush list & options box */
  hbox = gtk_hbox_new (FALSE, 2);
  gtk_container_add (GTK_CONTAINER (vbox), hbox);

  /*  A place holder for paint mode switching  */
  bsp->left_box = gtk_hbox_new (FALSE, 0);
  gtk_box_pack_start (GTK_BOX (hbox), bsp->left_box, TRUE, TRUE, 0);

  /*  The hbox for the brush list  */
  bsp->brush_selection_box = gtk_hbox_new (FALSE, 0);
  gtk_container_add (GTK_CONTAINER (bsp->left_box), bsp->brush_selection_box);

  frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
  gtk_box_pack_start (GTK_BOX (bsp->brush_selection_box), frame,
		      TRUE, TRUE, 0);
  bsp->sbar_data = GTK_ADJUSTMENT (gtk_adjustment_new (0, 0, MAX_WIN_HEIGHT(bsp), 1, 1, MAX_WIN_HEIGHT(bsp)));
  sbar = gtk_vscrollbar_new (bsp->sbar_data);
  gtk_signal_connect (GTK_OBJECT (bsp->sbar_data), "value_changed",
		      (GtkSignalFunc) preview_scroll_update, bsp);
  gtk_box_pack_start (GTK_BOX (bsp->brush_selection_box), sbar, FALSE, FALSE, 0);

  /*  Create the brush preview window and the underlying image  */

  /*  Get the maximum brush extents  */
  bsp->cell_width = MIN_CELL_SIZE;
  bsp->cell_height = MIN_CELL_SIZE;

  bsp->preview = gtk_preview_new (GTK_PREVIEW_GRAYSCALE);
  gtk_preview_size (GTK_PREVIEW (bsp->preview),
		    MAX_WIN_WIDTH (bsp), MAX_WIN_HEIGHT (bsp));
  gtk_widget_set_usize (bsp->preview,
			MAX_WIN_WIDTH (bsp), MAX_WIN_HEIGHT (bsp));
  gtk_preview_set_expand (GTK_PREVIEW (bsp->preview), TRUE);
  gtk_widget_set_events (bsp->preview, BRUSH_EVENT_MASK);

  gtk_signal_connect (GTK_OBJECT (bsp->preview), "event",
		      (GtkSignalFunc) brush_select_events,
		      bsp);
  gtk_signal_connect (GTK_OBJECT(bsp->preview), "size_allocate",
		      (GtkSignalFunc) brush_select_resize,
		      bsp);

  gtk_container_add (GTK_CONTAINER (frame), bsp->preview);
  gtk_widget_show (bsp->preview);

  gtk_widget_show (sbar);
  gtk_widget_show (frame);
  gtk_widget_show (bsp->brush_selection_box);
  gtk_widget_show (bsp->left_box);

  /*  Options box  */
  bsp->options_box = gtk_vbox_new (FALSE, 0);
  gtk_box_pack_start (GTK_BOX (hbox), bsp->options_box, FALSE, FALSE, 0);

  /*  Create the active brush label  */
  util_box = gtk_hbox_new (FALSE, 0);
  gtk_box_pack_start (GTK_BOX (bsp->options_box), util_box, FALSE, FALSE, 2);

  bsp->brush_name = gtk_label_new (_("Active"));
  gtk_box_pack_start (GTK_BOX (util_box), bsp->brush_name, FALSE, FALSE, 4);
  bsp->brush_size = gtk_label_new ("(0 X 0)");
  gtk_box_pack_start (GTK_BOX (util_box), bsp->brush_size, FALSE, FALSE, 2);

  gtk_widget_show (bsp->brush_name);
  gtk_widget_show (bsp->brush_size);
  gtk_widget_show (util_box);

  /*  A place holder for paint mode switching  */
  bsp->right_box = gtk_vbox_new (FALSE, 0);
  gtk_box_pack_start (GTK_BOX (bsp->options_box), bsp->right_box, TRUE, TRUE, 0);

  /*  The vbox for the paint options  */
  bsp->paint_options_box = gtk_vbox_new (FALSE, 0);
  gtk_box_pack_start (GTK_BOX (bsp->right_box), bsp->paint_options_box,
		      FALSE, FALSE, 0);

  /*  A separator before the paint options  */
  sep = gtk_hseparator_new ();
  gtk_box_pack_start (GTK_BOX (bsp->paint_options_box), sep, FALSE, FALSE, 0);
  gtk_widget_show (sep);

  /*  Create the frame and the table for the options  */
  table = gtk_table_new (2, 2, FALSE);
  gtk_table_set_col_spacing (GTK_TABLE (table), 0, 4);
  gtk_table_set_row_spacings (GTK_TABLE (table), 2);
  gtk_box_pack_start (GTK_BOX (bsp->paint_options_box), table, FALSE, FALSE, 2);

  /*  Create the opacity scale widget  */
  label = gtk_label_new (_("Opacity:"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 1.0);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 0, 1,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
  gtk_widget_show (label);

  bsp->opacity_data = 
    GTK_ADJUSTMENT (gtk_adjustment_new ((active)?(init_opacity*100.0):100.0,
					0.0, 100.0, 1.0, 1.0, 0.0));
  slider = gtk_hscale_new (bsp->opacity_data);
  gtk_scale_set_value_pos (GTK_SCALE (slider), GTK_POS_TOP);
  gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
  gtk_table_attach_defaults (GTK_TABLE (table), slider, 1, 2, 0, 1);
  gtk_signal_connect (GTK_OBJECT (bsp->opacity_data), "value_changed",
		      (GtkSignalFunc) opacity_scale_update, bsp);
  gtk_widget_show (slider);

  /*  Create the paint mode option menu  */
  label = gtk_label_new (_("Mode:"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 1, 2,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
  gtk_widget_show (label);

  abox = gtk_alignment_new (0.0, 0.5, 0.0, 0.0);
  gtk_table_attach_defaults (GTK_TABLE (table), abox, 1, 2, 1, 2);
  gtk_widget_show (abox);

  menu = paint_mode_menu_new (paint_mode_menu_callback, (gpointer) bsp);
  bsp->option_menu = option_menu = gtk_option_menu_new ();
  gtk_container_add (GTK_CONTAINER (abox), option_menu);
  gtk_widget_show (option_menu);
  gtk_option_menu_set_menu (GTK_OPTION_MENU (option_menu), menu);

  gtk_widget_show (table);
  gtk_widget_show (bsp->paint_options_box);
  gtk_widget_show (bsp->right_box);

  /*  Create the edit/new buttons  */
  util_box = gtk_hbox_new (FALSE, 0);
  gtk_box_pack_end (GTK_BOX (bsp->options_box), util_box, FALSE, FALSE, 4);
  bsp->edit_button =  gtk_button_new_with_label (_("Edit Brush"));
  gtk_signal_connect (GTK_OBJECT (bsp->edit_button), "clicked",
		      (GtkSignalFunc) edit_brush_callback,
		      NULL);
  gtk_box_pack_start (GTK_BOX (util_box), bsp->edit_button, TRUE, TRUE, 5);

  button2 =  gtk_button_new_with_label (_("New Brush"));
  gtk_signal_connect (GTK_OBJECT (button2), "clicked",
		      (GtkSignalFunc) new_brush_callback,
		      NULL);
  gtk_box_pack_start (GTK_BOX (util_box), button2, TRUE, TRUE, 6);

  gtk_widget_show (bsp->edit_button);    
  gtk_widget_show (button2);
  gtk_widget_show (util_box);

  /*  We can only edit in the main window! (for now)  */
  if (title)
    {
      gtk_widget_set_sensitive (bsp->edit_button, FALSE);
      gtk_widget_set_sensitive (button2, FALSE);
    }

  /*  Create the spacing scale widget  */
  table = gtk_table_new (1, 2, FALSE);
  gtk_table_set_col_spacing (GTK_TABLE (table), 0, 4);
  gtk_box_pack_end (GTK_BOX (bsp->options_box), table, FALSE, FALSE, 2);

  label = gtk_label_new (_("Spacing:"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 1.0);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 0, 1,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
  gtk_widget_show (label);

  bsp->spacing_data =
    GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 1.0, 1000.0, 1.0, 1.0, 0.0));
  slider = gtk_hscale_new (bsp->spacing_data);
  gtk_table_attach_defaults (GTK_TABLE (table), slider, 1, 2, 0, 1);
  gtk_scale_set_value_pos (GTK_SCALE (slider), GTK_POS_TOP);
  gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
  gtk_signal_connect (GTK_OBJECT (bsp->spacing_data), "value_changed",
		      (GtkSignalFunc) spacing_scale_update, bsp);
  gtk_widget_show (slider);

  gtk_widget_show (table);

  /*  The action area  */
  action_items[0].user_data = bsp;
  action_items[1].user_data = bsp;
  if (title)
    build_action_area (GTK_DIALOG (bsp->shell), &action_items[1], 1, 0);
  else
    build_action_area (GTK_DIALOG (bsp->shell), action_items, 2, 1);

  gtk_widget_show (bsp->options_box);
  gtk_widget_show (hbox);
  gtk_widget_show (vbox);

  /*  Calculate the scrollbar  */
  if (no_data)
    brushes_init (FALSE);
  /*  This is done by size_allocate anyway, which is much better  */
  preview_calc_scrollbar (bsp);

  /*  render the brushes into the newly created image structure  */
  display_brushes (bsp);

  /*  Only for main dialog  */
  if(!title)
    {
      /*  add callbacks to keep the display area current  */
      gimp_list_foreach (GIMP_LIST (brush_list),
			 (GFunc) connect_signals_to_brush,
			 bsp);
      gtk_signal_connect (GTK_OBJECT (brush_list), "add",
			  (GtkSignalFunc) brush_added_callback,
			  bsp);
      gtk_signal_connect (GTK_OBJECT (brush_list), "remove",
			  (GtkSignalFunc) brush_removed_callback,
			  bsp);

      /*  set the preview's size in the callback
      gtk_signal_connect (GTK_OBJECT (bsp->shell), "map",
			  GTK_SIGNAL_FUNC (brush_select_map_callback),
			  bsp);
      */

      /*  if we are in per-tool paint options mode, hide the paint options  */
      brush_select_show_paint_options (bsp, global_paint_options);
    }

  /*  update the active selection  */
  if (!active)
    active = get_active_brush ();

  if (title)
    {
      bsp->brush = active;
    }

  if (active)
    {
      int old_value = bsp->redraw;
      bsp->redraw = FALSE;
      if (!gotinitbrush)
	{
	  bsp->opacity_value = paint_options_get_opacity ();
	  bsp->spacing_value = gimp_brush_get_spacing (active);
	  bsp->paint_mode = paint_options_get_paint_mode ();
	}
      else
	{
	  bsp->opacity_value = init_opacity;
	  bsp->paint_mode = init_mode;
	}
      brush_select_select (bsp, gimp_brush_list_get_brush_index (brush_list, 
								 active));

      if (gotinitbrush && init_spacing >= 0)
	{
	  /* Use passed spacing instead of brushes default */
	  bsp->spacing_data->value = init_spacing;
	  gtk_signal_emit_by_name (GTK_OBJECT (bsp->spacing_data),
				   "value_changed");
	}
      bsp->redraw = old_value;
      if (GIMP_IS_BRUSH_GENERATED (active))
	gtk_widget_set_sensitive (bsp->edit_button, 1);
      else
	gtk_widget_set_sensitive (bsp->edit_button, 0); 
    }

  /*  Finally, show the dialog  */
  gtk_widget_show (bsp->shell);

  return bsp;
}


void
brush_select_select (BrushSelectP bsp,
		     int          index)
{
  int row, col;
  if (index < 0)
    return;
  update_active_brush_field (bsp);
  row = index / bsp->NUM_BRUSH_COLUMNS;
  col = index - row * (bsp->NUM_BRUSH_COLUMNS);

  brush_select_show_selected (bsp, row, col);
}


void
brush_select_free (BrushSelectP bsp)
{
  if (bsp)
    {
      /* Only main one is saved */
      if (bsp == brush_select_dialog)
	{
	  session_get_window_info (bsp->shell, &brush_select_session_info);
	  /*  save the size of the preview  */
	  brush_select_session_info.width = bsp->preview->allocation.width;
	  brush_select_session_info.height = bsp->preview->allocation.height;
	}
      if (bsp->brush_popup != NULL)
	gtk_widget_destroy (bsp->brush_popup);

      if (bsp->callback_name)
	g_free (bsp->callback_name);

      /* remove from active list */
      brush_active_dialogs = g_slist_remove (brush_active_dialogs, bsp);

      g_free (bsp);
    }
}

void
brush_change_callbacks (BrushSelectP bsp,
			gint         closing)
{
  gchar * name;
  ProcRecord *prec = NULL;
  GimpBrushP brush;
  int nreturn_vals;
  static int busy = 0;

  /* Any procs registered to callback? */
  Argument *return_vals; 

  if (!bsp || !bsp->callback_name || busy != 0)
    return;

  busy = 1;
  name = bsp->callback_name;
  brush = bsp->brush;

  /* If its still registered run it */
  prec = procedural_db_lookup (name);

  if(prec && brush)
    {
      return_vals = procedural_db_run_proc (name,
					    &nreturn_vals,
					    PDB_STRING,brush->name,
					    PDB_FLOAT,bsp->opacity_value,
					    PDB_INT32,bsp->spacing_value,
					    PDB_INT32,(gint)bsp->paint_mode,
					    PDB_INT32,brush->mask->width,
					    PDB_INT32,brush->mask->height,
					    PDB_INT32,brush->mask->width * brush->mask->height,
					    PDB_INT8ARRAY,temp_buf_data (brush->mask),
					    PDB_INT32,closing,
					    PDB_END);
 
      if (!return_vals || return_vals[0].value.pdb_int != PDB_SUCCESS)
	g_message (_("failed to run brush callback function"));
      
      procedural_db_destroy_args (return_vals, nreturn_vals);
    }
  busy = 0;
}

void
brush_select_show_paint_options (BrushSelectP  bsp,
				 gboolean      show)
{
  show = show ? TRUE : FALSE;

  if ((bsp == NULL) && ((bsp = brush_select_dialog) == NULL))
    return;

  if (show)
    {
      if (! GTK_WIDGET_VISIBLE (bsp->paint_options_box))
	gtk_widget_show (bsp->paint_options_box);
      if (bsp->brush_selection_box->parent != bsp->left_box)
	gtk_widget_reparent (bsp->brush_selection_box, bsp->left_box);
      gtk_box_set_child_packing (GTK_BOX (bsp->options_box->parent),
				 bsp->options_box,
				 FALSE, FALSE, 0, GTK_PACK_START);
      gtk_box_set_child_packing (GTK_BOX (bsp->left_box->parent),
				 bsp->left_box,
				 TRUE, TRUE, 0, GTK_PACK_START);
      gtk_box_set_spacing (GTK_BOX (bsp->left_box->parent), 2);
    }
  else
    {
      if (GTK_WIDGET_VISIBLE (bsp->paint_options_box))
	gtk_widget_hide (bsp->paint_options_box);
      if (bsp->brush_selection_box->parent != bsp->right_box)
	gtk_widget_reparent (bsp->brush_selection_box, bsp->right_box);
      gtk_box_set_child_packing (GTK_BOX (bsp->left_box->parent),
				 bsp->left_box,
				 FALSE, FALSE, 0, GTK_PACK_START);
      gtk_box_set_child_packing (GTK_BOX (bsp->options_box->parent),
				 bsp->options_box,
				 TRUE, TRUE, 0, GTK_PACK_START);
      gtk_box_set_spacing (GTK_BOX (bsp->left_box->parent), 0);
    }
}

/*  Disabled until I've figured out how gtk window resizing *really* works.
 *  I don't think that the function below is the correct way to do it
 *    --  Michael
 *
static void
brush_select_map_callback (GtkWidget    *widget,
			   BrushSelectP  bsp)
{
  GtkAllocation allocation;
  gint xdiff, ydiff;

  xdiff =
    bsp->shell->allocation.width - bsp->preview->allocation.width;
  ydiff =
    bsp->shell->allocation.height - bsp->preview->allocation.height;

  allocation = bsp->shell->allocation;
  allocation.width = brush_select_session_info.width + xdiff;
  allocation.height = brush_select_session_info.height + ydiff;

  gtk_widget_size_allocate (bsp->shell, &allocation);
}
*/

static void
brush_select_brush_changed (BrushSelectP bsp,
			    GimpBrushP   brush)
{
  /* TODO: be smarter here and only update the part of the preview
   *       that has changed */
  if (bsp)
  {
    display_brushes (bsp);
    gtk_widget_draw (bsp->preview, NULL);
  }
}

static gint
brush_select_brush_dirty_callback (GimpBrushP   brush,
				   BrushSelectP bsp)
{
  brush_select_brush_changed (bsp, brush);
  return TRUE;
}

static void
connect_signals_to_brush (GimpBrushP   brush,
			  BrushSelectP bsp)
{
  gtk_signal_connect (GTK_OBJECT (brush), "dirty",
		      GTK_SIGNAL_FUNC (brush_select_brush_dirty_callback),
		      bsp);
}

static void
disconnect_signals_from_brush (GimpBrushP   brush,
			       BrushSelectP bsp)
{
  if (!GTK_OBJECT_DESTROYED (brush))
    gtk_signal_disconnect_by_data (GTK_OBJECT (brush), bsp);
}

static void
brush_added_callback (GimpBrushList *list,
		      GimpBrushP     brush, 
		      BrushSelectP   bsp)
{
  connect_signals_to_brush (brush, bsp);
  preview_calc_scrollbar (bsp);
  brush_select_brush_changed (bsp, brush);
}

static void
brush_removed_callback (GimpBrushList *list,
			GimpBrushP     brush,
			BrushSelectP   bsp)
{
  disconnect_signals_from_brush (brush, bsp);
  preview_calc_scrollbar (bsp);
}


/*
 *  Local functions
 */

typedef struct {
  BrushSelectP   bsp;
  int            x;
  int            y;
  GimpBrushP     brush;
} popup_timeout_args_t;


static gboolean
brush_popup_timeout (gpointer data)
{
  popup_timeout_args_t *args = data;
  BrushSelectP bsp = args->bsp;
  GimpBrushP brush = args->brush;
  gint x, y;
  gint x_org, y_org;
  gint scr_w, scr_h;
  gchar *src, *buf;

  /* timeout has gone off so our tag is now invalid  */
  bsp->popup_timeout_tag = 0;

  /* make sure the popup exists and is not visible */
  if (bsp->brush_popup == NULL)
    {
      GtkWidget *frame;

      bsp->brush_popup = gtk_window_new (GTK_WINDOW_POPUP);
      gtk_window_set_policy (GTK_WINDOW (bsp->brush_popup),
			     FALSE, FALSE, TRUE);
      frame = gtk_frame_new (NULL);
      gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_OUT);
      gtk_container_add (GTK_CONTAINER (bsp->brush_popup), frame);
      gtk_widget_show (frame);
      bsp->brush_preview = gtk_preview_new (GTK_PREVIEW_GRAYSCALE);
      gtk_container_add (GTK_CONTAINER (frame), bsp->brush_preview);
      gtk_widget_show (bsp->brush_preview);
    }
  else
    {
      gtk_widget_hide (bsp->brush_popup);
    }

  /* decide where to put the popup */
  gdk_window_get_origin (bsp->preview->window, &x_org, &y_org);
  scr_w = gdk_screen_width ();
  scr_h = gdk_screen_height ();
  x = x_org + args->x - brush->mask->width * 0.5;
  y = y_org + args->y - brush->mask->height * 0.5;
  x = (x < 0) ? 0 : x;
  y = (y < 0) ? 0 : y;
  x = (x + brush->mask->width > scr_w) ? scr_w - brush->mask->width : x;
  y = (y + brush->mask->height > scr_h) ? scr_h - brush->mask->height : y;
  gtk_preview_size (GTK_PREVIEW (bsp->brush_preview),
		    brush->mask->width, brush->mask->height);

  gtk_widget_popup (bsp->brush_popup, x, y);

  /*  Draw the brush  */
  buf = g_new (gchar, brush->mask->width);
  src = (gchar *) temp_buf_data (brush->mask);
  for (y = 0; y < brush->mask->height; y++)
    {
      /*  Invert the mask for display.  We're doing this because
       *  a value of 255 in the  mask means it is full intensity.
       *  However, it makes more sense for full intensity to show
       *  up as black in this brush preview window...
       */
      for (x = 0; x < brush->mask->width; x++)
	buf[x] = 255 - src[x];
      gtk_preview_draw_row (GTK_PREVIEW (bsp->brush_preview), (guchar *)buf,
			    0, y, brush->mask->width);
      src += brush->mask->width;
    }
  g_free (buf);

  /*  Draw the brush preview  */
  gtk_widget_draw (bsp->brush_preview, NULL);

  return FALSE;  /* don't repeat */
}

static void
brush_popup_open (BrushSelectP bsp,
		  int          x,
		  int          y,
		  GimpBrushP   brush)
{
  static popup_timeout_args_t popup_timeout_args;

  /* if we've already got a timeout scheduled, then we complain */
  g_return_if_fail (bsp->popup_timeout_tag == 0);

  popup_timeout_args.bsp = bsp;
  popup_timeout_args.x = x;
  popup_timeout_args.y = y;
  popup_timeout_args.brush = brush;
  bsp->popup_timeout_tag = gtk_timeout_add (POPUP_DELAY_MS,
					    brush_popup_timeout,
					    &popup_timeout_args);
}

static void
brush_popup_close (BrushSelectP bsp)
{
  if (bsp->popup_timeout_tag != 0)
    gtk_timeout_remove (bsp->popup_timeout_tag);
  bsp->popup_timeout_tag = 0;

  if (bsp->brush_popup != NULL)
    gtk_widget_hide (bsp->brush_popup);
}

static void
display_brush (BrushSelectP bsp,
	       GimpBrushP   brush,
	       int          col,
	       int          row)
{
  TempBuf * brush_buf;
  unsigned char * src, *s;
  unsigned char * buf, *b;
  int width, height;
  int offset_x, offset_y;
  int yend;
  int ystart;
  int i, j;

  buf = (unsigned char *) g_malloc (sizeof (char) * bsp->cell_width);

  brush_buf = brush->mask;

  /*  calculate the offset into the image  */
  width = (brush_buf->width > bsp->cell_width) ? bsp->cell_width :
    brush_buf->width;
  height = (brush_buf->height > bsp->cell_height) ? bsp->cell_height :
    brush_buf->height;

  offset_x = col * bsp->cell_width + ((bsp->cell_width - width) >> 1);
  offset_y = row * bsp->cell_height + ((bsp->cell_height - height) >> 1)
    - bsp->scroll_offset;

  ystart = BOUNDS (offset_y, 0, bsp->preview->allocation.height);
  yend = BOUNDS (offset_y + height, 0, bsp->preview->allocation.height);

  /*  Get the pointer into the brush mask data  */
  src = mask_buf_data (brush_buf) + (ystart - offset_y) * brush_buf->width;

  for (i = ystart; i < yend; i++)
    {
      /*  Invert the mask for display.  We're doing this because
       *  a value of 255 in the  mask means it is full intensity.
       *  However, it makes more sense for full intensity to show
       *  up as black in this brush preview window...
       */
      s = src;
      b = buf;
      for (j = 0; j < width; j++)
	*b++ = 255 - *s++;

      gtk_preview_draw_row (GTK_PREVIEW (bsp->preview), buf, offset_x, i, width);

      src += brush_buf->width;
    }

  g_free (buf);
}


static void
display_setup (BrushSelectP bsp)
{
  unsigned char * buf;
  int i;

  buf =
    (unsigned char *) g_malloc (sizeof (char) * bsp->preview->allocation.width);

  /*  Set the buffer to white  */
  memset (buf, 255, bsp->preview->allocation.width);

  /*  Set the image buffer to white  */
  for (i = 0; i < bsp->preview->allocation.height; i++)
    gtk_preview_draw_row (GTK_PREVIEW (bsp->preview), buf, 0, i,
			  bsp->preview->allocation.width);

  g_free (buf);
}


static int brush_counter = 0;

static void
do_display_brush (GimpBrush    *brush,
		  BrushSelectP  bsp)
{
  display_brush (bsp, brush, brush_counter % (bsp->NUM_BRUSH_COLUMNS),
		 brush_counter / (bsp->NUM_BRUSH_COLUMNS));
  brush_counter++;
}

static void
display_brushes (BrushSelectP bsp)
{
  /*  If there are no brushes, insensitize widgets  */
  if (brush_list == NULL || gimp_brush_list_length(brush_list) == 0)
    {
      gtk_widget_set_sensitive (bsp->options_box, FALSE);
      return;
    }
  /*  Else, sensitize widgets  */
  else
    gtk_widget_set_sensitive (bsp->options_box, TRUE);

  /*  setup the display area  */
  display_setup (bsp);
  brush_counter = 0;
  gimp_list_foreach (GIMP_LIST (brush_list), (GFunc) do_display_brush, bsp);
}


static void
brush_select_show_selected (BrushSelectP bsp,
			    int          row,
			    int          col)
{
  GdkRectangle area;
  unsigned char * buf;
  int yend;
  int ystart;
  int offset_x, offset_y;
  int i;

  buf = (unsigned char *) g_malloc (sizeof (char) * bsp->cell_width);

  if (bsp->old_col != col || bsp->old_row != row)
    {
      /*  remove the old selection  */
      offset_x = bsp->old_col * bsp->cell_width;
      offset_y = bsp->old_row * bsp->cell_height - bsp->scroll_offset;

      ystart = BOUNDS (offset_y , 0, bsp->preview->allocation.height);
      yend = BOUNDS (offset_y + bsp->cell_height, 0, bsp->preview->allocation.height);

      /*  set the buf to white  */
      memset (buf, 255, bsp->cell_width);

      for (i = ystart; i < yend; i++)
	{
	  if (i == offset_y || i == (offset_y + bsp->cell_height - 1))
	    gtk_preview_draw_row (GTK_PREVIEW (bsp->preview), buf,
				  offset_x, i, bsp->cell_width);
	  else
	    {
	      gtk_preview_draw_row (GTK_PREVIEW (bsp->preview), buf,
				    offset_x, i, 1);
	      gtk_preview_draw_row (GTK_PREVIEW (bsp->preview), buf,
				    offset_x + bsp->cell_width - 1, i, 1);
	    }
	}

      if (bsp->redraw)
	{
	  area.x = offset_x;
	  area.y = ystart;
	  area.width = bsp->cell_width;
	  area.height = (yend - ystart);
	  gtk_widget_draw (bsp->preview, &area);
	}
    }

  /*  make the new selection  */
  offset_x = col * bsp->cell_width;
  offset_y = row * bsp->cell_height - bsp->scroll_offset;

  ystart = BOUNDS (offset_y , 0, bsp->preview->allocation.height);
  yend = BOUNDS (offset_y + bsp->cell_height, 0, bsp->preview->allocation.height);

  /*  set the buf to black  */
  memset (buf, 0, bsp->cell_width);

  for (i = ystart; i < yend; i++)
    {
      if (i == offset_y || i == (offset_y + bsp->cell_height - 1))
	gtk_preview_draw_row (GTK_PREVIEW (bsp->preview),
			      buf, offset_x, i, bsp->cell_width);
      else
	{
	  gtk_preview_draw_row (GTK_PREVIEW (bsp->preview), buf,
				offset_x, i, 1);
	  gtk_preview_draw_row (GTK_PREVIEW (bsp->preview), buf,
				offset_x + bsp->cell_width - 1, i, 1);
	}
    }

  if (bsp->redraw)
    {
      area.x = offset_x;
      area.y = ystart;
      area.width = bsp->cell_width;
      area.height = (yend - ystart);
      gtk_widget_draw (bsp->preview, &area);
    }

  bsp->old_row = row;
  bsp->old_col = col;

  g_free (buf);
}


static void
preview_calc_scrollbar (BrushSelectP bsp)
{
  int num_rows;
  int page_size;
  int max;

  bsp->scroll_offset = 0;
  num_rows = (gimp_brush_list_length(brush_list) + (bsp->NUM_BRUSH_COLUMNS) - 1)
    / (bsp->NUM_BRUSH_COLUMNS);
  max = num_rows * bsp->cell_width;
  if (!num_rows) num_rows = 1;
  page_size = bsp->preview->allocation.height;

  bsp->sbar_data->value = bsp->scroll_offset;
  bsp->sbar_data->upper = max;
  bsp->sbar_data->page_size = ((page_size < max) ? page_size : max);
  bsp->sbar_data->page_increment = (page_size >> 1);
  bsp->sbar_data->step_increment = bsp->cell_width;

  gtk_signal_emit_by_name (GTK_OBJECT (bsp->sbar_data), "changed");
}

static gint 
brush_select_resize (GtkWidget    *widget, 
		     GdkEvent     *event, 
		     BrushSelectP  bsp)
{
  /*  calculate the best-fit approximation...  */  
  gint wid;
  gint now;
  gint cell_size;

  wid = widget->allocation.width;

  for(now = cell_size = MIN_CELL_SIZE;
      now < MAX_CELL_SIZE; ++now)
    {
      if ((wid % now) < (wid % cell_size)) cell_size = now;
      if ((wid % cell_size) == 0)
        break;
    }

   bsp->NUM_BRUSH_COLUMNS =
     (gint) (wid / cell_size);
   bsp->NUM_BRUSH_ROWS =
     (gint) ((gimp_brush_list_length (brush_list) + bsp->NUM_BRUSH_COLUMNS - 1) /
	     bsp->NUM_BRUSH_COLUMNS);
   
   bsp->cell_width = cell_size;
   bsp->cell_height = cell_size;

   /*  recalculate scrollbar extents  */
   preview_calc_scrollbar (bsp);
 
   /*  render the brushes into the newly created image structure  */
   display_brushes (bsp);

   /*  update the display  */   
   if (bsp->redraw)
     gtk_widget_draw (bsp->preview, NULL);

   return FALSE;
}
 
static void
update_active_brush_field (BrushSelectP bsp)
{
  GimpBrushP brush;
  char buf[32];

  if (bsp->brush)
    brush = bsp->brush;
  else
    brush = get_active_brush ();

  if (!brush)
    return;

  /*  Set brush name  */
  gtk_label_set_text (GTK_LABEL (bsp->brush_name), brush->name);

  /*  Set brush size  */
  g_snprintf (buf, 32, "(%d X %d)", brush->mask->width, brush->mask->height);
  gtk_label_set_text (GTK_LABEL (bsp->brush_size), buf);

  /*  Set brush spacing  */
  if (bsp == brush_select_dialog)
    bsp->spacing_data->value = gimp_brush_get_spacing (brush);
  else
    bsp->spacing_data->value = bsp->spacing_value = brush->spacing;

  gtk_signal_emit_by_name (GTK_OBJECT (bsp->spacing_data), "value_changed");
}


static gint
brush_select_events (GtkWidget    *widget,
		     GdkEvent     *event,
		     BrushSelectP  bsp)
{
  GdkEventButton *bevent;
  GimpBrushP brush;
  int row, col, index;

  switch (event->type)
    {
    case GDK_EXPOSE:
      break;

    case GDK_BUTTON_PRESS:
      bevent = (GdkEventButton *) event;

      if (bevent->button == 1)
	{
	  col = bevent->x / bsp->cell_width;
	  row = (bevent->y + bsp->scroll_offset) / bsp->cell_height;
	  index = row * bsp->NUM_BRUSH_COLUMNS + col;

	  /*  Get the brush and display the popup brush preview  */
	  if ((brush = gimp_brush_list_get_brush_by_index (brush_list, index)))
	    {
	      gdk_pointer_grab (bsp->preview->window, FALSE,
				(GDK_POINTER_MOTION_HINT_MASK |
				 GDK_BUTTON1_MOTION_MASK |
				 GDK_BUTTON_RELEASE_MASK),
				NULL, NULL, bevent->time);

	      /*  Make this brush the active brush  */
	      /* only if dialog is main one */
	      if (bsp == brush_select_dialog)
		{
		  select_brush (brush);
		}
	      else
		{
		  /* Keeping up appearances */
		  if (bsp)
		    {
		      bsp->brush = brush;
		      brush_select_select (bsp,
			gimp_brush_list_get_brush_index (brush_list, brush));
		    }
		}
		

	      if (GIMP_IS_BRUSH_GENERATED (brush) && bsp == brush_select_dialog)
		gtk_widget_set_sensitive (bsp->edit_button, 1);
	      else
		gtk_widget_set_sensitive (bsp->edit_button, 0);
	      
	      if (brush_edit_generated_dialog)
		brush_edit_generated_set_brush (brush_edit_generated_dialog,
						get_active_brush ());
	      
	      /*  Show the brush popup window if the brush is too large  */
	      if (brush->mask->width > bsp->cell_width ||
		  brush->mask->height > bsp->cell_height)
		brush_popup_open (bsp, bevent->x, bevent->y, brush);
	    }
	}
      break;

    case GDK_BUTTON_RELEASE:
      bevent = (GdkEventButton *) event;

      if (bevent->button == 1)
	{
	  /*  Ungrab the pointer  */
	  gdk_pointer_ungrab (bevent->time);

	  /*  Close the brush popup window  */
	  brush_popup_close (bsp);

	  /* Call any callbacks registered */
	  brush_change_callbacks (bsp, 0);
	}
      break;
    case GDK_DELETE:
      /* g_warning ("test"); */
      break;

    default:
      break;
    }

  return FALSE;
}

static gint
edit_brush_callback (GtkWidget *w,
		     GdkEvent  *e,
		     gpointer   data)
{
  if (GIMP_IS_BRUSH_GENERATED (get_active_brush ()))
  {
    if (!brush_edit_generated_dialog)
    {
      /*  Create the dialog...  */
      brush_edit_generated_dialog = brush_edit_generated_new ();
      brush_edit_generated_set_brush (brush_edit_generated_dialog,
				      get_active_brush ());
    }
    else
    {
      /*  Popup the dialog  */
      if (!GTK_WIDGET_VISIBLE (brush_edit_generated_dialog->shell))
	gtk_widget_show (brush_edit_generated_dialog->shell);
      else
	gdk_window_raise (brush_edit_generated_dialog->shell->window);
    }
  }
  else
    g_message (_("We are all fresh out of brush editors today,\n"
		 "please write your own or try back tomorrow\n"));
  return TRUE;
}

static gint
new_brush_callback (GtkWidget *w,
		    GdkEvent  *e,
		    gpointer   data)
{
  GimpBrushGenerated *brush;
  brush = gimp_brush_generated_new (10, .5, 0.0, 1.0);
  gimp_brush_list_add(brush_list, GIMP_BRUSH (brush));
  select_brush (GIMP_BRUSH (brush));
  if (brush_edit_generated_dialog)
    brush_edit_generated_set_brush (brush_edit_generated_dialog,
				    get_active_brush());
  edit_brush_callback (w, e, data);
  return TRUE;
}

static gint
brush_select_delete_callback (GtkWidget *w,
			      GdkEvent  *e,
			      gpointer   data)
{
  brush_select_close_callback (w, data);

  return TRUE;
}

static void
brush_select_close_callback (GtkWidget *w, /* Unused so can be NULL */
			     gpointer   client_data)
{
  BrushSelectP bsp;

  bsp = (BrushSelectP) client_data;

  if (GTK_WIDGET_VISIBLE (bsp->shell))
    gtk_widget_hide (bsp->shell);

  /* Free memory if poping down dialog which is not the main one */
  if (bsp != brush_select_dialog)
    {
      /* Send data back */
      brush_change_callbacks (bsp,1);
      gtk_widget_destroy (bsp->shell); 
      brush_select_free (bsp); 
    }
}


static void
brush_select_refresh_callback (GtkWidget *w,
			       gpointer   client_data)
{
  BrushSelectP bsp;
  GimpBrushP active;

  bsp = (BrushSelectP) client_data;

  /*  re-init the brush list  */
  brushes_init (FALSE);

  /*  recalculate scrollbar extents  */
  preview_calc_scrollbar (bsp);

  /*  render the brushes into the newly created image structure  */
  display_brushes (bsp);

  /*  update the active selection  */
  active = get_active_brush ();
  if (active)
    brush_select_select (bsp, gimp_brush_list_get_brush_index (brush_list, 
							       active));

  /*  update the display  */
  if (bsp->redraw)
    gtk_widget_draw (bsp->preview, NULL);
}


static void
preview_scroll_update (GtkAdjustment *adjustment,
		       gpointer       data)
{
  BrushSelectP bsp;
  GimpBrushP active;
  int row, col, index;

  bsp = data;

  if (bsp)
    {
      bsp->scroll_offset = adjustment->value;
      display_brushes (bsp);

      if (brush_select_dialog == bsp)
	active = get_active_brush ();
      else
	active = bsp->brush;

      if (active)
	{
	  index = gimp_brush_list_get_brush_index (brush_list, active);
	  if (index < 0)
	    return;
	  row = index / bsp->NUM_BRUSH_COLUMNS;
	  col = index - row * bsp->NUM_BRUSH_COLUMNS;
	  brush_select_show_selected (bsp, row, col);
	}

      if (bsp->redraw)
	gtk_widget_draw (bsp->preview, NULL);
    }
}

static void
paint_mode_menu_callback (GtkWidget *w,
			  gpointer   client_data)
{
  BrushSelectP bsp = (BrushSelectP) gtk_object_get_user_data (GTK_OBJECT (w));
  
  if (bsp == brush_select_dialog)
    paint_options_set_paint_mode ((int) client_data);
  else
    {
      bsp->paint_mode = (int) client_data;
      brush_change_callbacks (bsp, 0);
    }
}


static void
opacity_scale_update (GtkAdjustment *adjustment,
		      gpointer       data)
{
  BrushSelectP bsp = (BrushSelectP) data;
  
  if(bsp == brush_select_dialog)
    paint_options_set_opacity (adjustment->value / 100.0);
  else
    {
      bsp->opacity_value = (adjustment->value / 100.0);
      brush_change_callbacks (bsp, 0); 
    }
}


static void
spacing_scale_update (GtkAdjustment *adjustment,
		      gpointer       data)
{
  BrushSelectP bsp = (BrushSelectP) data;
  
  if(bsp == brush_select_dialog)
    gimp_brush_set_spacing (get_active_brush(), (int) adjustment->value);
  else
    {
      if(bsp->spacing_value != adjustment->value)
	{
	  bsp->spacing_value = adjustment->value;
	  brush_change_callbacks (bsp, 0);
	}
    }
}

/* not used
static void
paint_options_toggle_callback (GtkWidget *widget,
			       gpointer   client_data)
{
  paint_options_set_global (GTK_TOGGLE_BUTTON (widget)->active);
}
*/

/* Close active dialogs that no longer have PDB registered for them */

void
brushes_check_dialogs (void)
{
  GSList *list;
  BrushSelectP bsp;
  gchar * name;
  ProcRecord *prec = NULL;

  list = brush_active_dialogs;

  while (list)
    {
      bsp = (BrushSelectP) list->data;
      list = list->next;

      name = bsp->callback_name;
      prec = procedural_db_lookup (name);
      
      if(!prec)
	{
	  brush_active_dialogs = g_slist_remove (brush_active_dialogs,bsp);

	  /* Can alter brush_active_dialogs list*/
	  brush_select_close_callback (NULL, bsp);
	}
    }
}