gtkcolorsel.c 81.2 KB
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/* GTK - The GIMP Toolkit
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 * Copyright (C) 2000 Red Hat, Inc.
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 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
 * version 2 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
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
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 */
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/*
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 * Modified by the GTK+ Team and others 1997-2001.  See the AUTHORS
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 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

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#include <config.h>
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#include "gdkconfig.h"
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#include <math.h>
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#include "gdk/gdkkeysyms.h"
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#include "gtkcolorsel.h"
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#include "gtkhsv.h"
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#include "gtkwindow.h"
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#include "gtkselection.h"
#include "gtkdnd.h"
#include "gtkdrawingarea.h"
#include "gtkhbox.h"
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#include "gtkhbbox.h"
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#include "gtkrc.h"
#include "gtkframe.h"
#include "gtktable.h"
#include "gtklabel.h"
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#include "gtkmarshalers.h"
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#include "gtkimage.h"
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#include "gtkspinbutton.h"
#include "gtkrange.h"
#include "gtkhscale.h"
#include "gtkentry.h"
#include "gtkbutton.h"
#include "gtkhseparator.h"
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#include "gtkinvisible.h"
#include "gtkmenuitem.h"
#include "gtkmain.h"
#include "gtksettings.h"
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#include "gtkstock.h"
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#include "gtkaccessible.h"
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#include "gtkprivate.h"
#include "gtkintl.h"
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#include "gtkalias.h"
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#include <string.h>

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/* Number of elements in the custom palatte */
#define GTK_CUSTOM_PALETTE_WIDTH 10
#define GTK_CUSTOM_PALETTE_HEIGHT 2

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/* Conversion between 0->1 double and and guint16. See
 * scale_round() below for more general conversions
 */
#define SCALE(i) (i / 65535.)
#define UNSCALE(d) ((guint16)(d * 65535 + 0.5))


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enum {
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  COLOR_CHANGED,
  LAST_SIGNAL
};

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enum {
  PROP_0,
  PROP_HAS_PALETTE,
  PROP_HAS_OPACITY_CONTROL,
  PROP_CURRENT_COLOR,
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  PROP_CURRENT_ALPHA
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};

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enum {
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  COLORSEL_RED = 0,
  COLORSEL_GREEN = 1,
  COLORSEL_BLUE = 2,
  COLORSEL_OPACITY = 3,
  COLORSEL_HUE,
  COLORSEL_SATURATION,
  COLORSEL_VALUE,
  COLORSEL_NUM_CHANNELS
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};

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typedef struct _ColorSelectionPrivate ColorSelectionPrivate;
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struct _ColorSelectionPrivate
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{
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  guint has_opacity : 1;
  guint has_palette : 1;
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  guint changing : 1;
  guint default_set : 1;
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  guint default_alpha_set : 1;
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  guint has_grab : 1;
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  gdouble color[COLORSEL_NUM_CHANNELS];
  gdouble old_color[COLORSEL_NUM_CHANNELS];
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  GtkWidget *triangle_colorsel;
  GtkWidget *hue_spinbutton;
  GtkWidget *sat_spinbutton;
  GtkWidget *val_spinbutton;
  GtkWidget *red_spinbutton;
  GtkWidget *green_spinbutton;
  GtkWidget *blue_spinbutton;
  GtkWidget *opacity_slider;
  GtkWidget *opacity_label;
  GtkWidget *opacity_entry;
  GtkWidget *palette_frame;
  GtkWidget *hex_entry;
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  /* The Palette code */
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  GtkWidget *custom_palette [GTK_CUSTOM_PALETTE_WIDTH][GTK_CUSTOM_PALETTE_HEIGHT];
  
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  /* The color_sample stuff */
  GtkWidget *sample_area;
  GtkWidget *old_sample;
  GtkWidget *cur_sample;
  GtkWidget *colorsel;
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  /* Window for grabbing on */
  GtkWidget *dropper_grab_widget;
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  guint32    grab_time;
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  /* Connection to settings */
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  gulong settings_connection;
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};


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static void gtk_color_selection_destroy		(GtkObject		 *object);
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static void gtk_color_selection_finalize        (GObject		 *object);
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static void update_color			(GtkColorSelection	 *colorsel);
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static void gtk_color_selection_set_property    (GObject                 *object,
					         guint                    prop_id,
					         const GValue            *value,
					         GParamSpec              *pspec);
static void gtk_color_selection_get_property    (GObject                 *object,
					         guint                    prop_id,
					         GValue                  *value,
					         GParamSpec              *pspec);
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static void gtk_color_selection_realize         (GtkWidget               *widget);
static void gtk_color_selection_unrealize       (GtkWidget               *widget);
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static void gtk_color_selection_show_all        (GtkWidget               *widget);
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static gboolean gtk_color_selection_grab_broken (GtkWidget               *widget,
						 GdkEventGrabBroken      *event);
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static void     gtk_color_selection_set_palette_color   (GtkColorSelection *colorsel,
                                                         gint               index,
                                                         GdkColor          *color);
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static void    set_focus_line_attributes                (GtkWidget         *drawing_area,
							 cairo_t           *cr,
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							 gint              *focus_width);
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static void     default_noscreen_change_palette_func    (const GdkColor    *colors,
							 gint               n_colors);
static void     default_change_palette_func             (GdkScreen	   *screen,
							 const GdkColor    *colors,
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							 gint               n_colors);
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static void     make_control_relations                  (AtkObject         *atk_obj,
                                                         GtkWidget         *widget);
static void     make_all_relations                      (AtkObject         *atk_obj,
                                                         ColorSelectionPrivate *priv);
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static guint color_selection_signals[LAST_SIGNAL] = { 0 };

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static const gchar default_colors[] = "black:white:gray50:red:purple:blue:light blue:green:yellow:orange:lavender:brown:goldenrod4:dodger blue:pink:light green:gray10:gray30:gray75:gray90";
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static GtkColorSelectionChangePaletteFunc noscreen_change_palette_hook = default_noscreen_change_palette_func;
static GtkColorSelectionChangePaletteWithScreenFunc change_palette_hook = default_change_palette_func;
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/* The cursor for the dropper */
#define DROPPER_WIDTH 17
#define DROPPER_HEIGHT 17
#define DROPPER_X_HOT 2
#define DROPPER_Y_HOT 16


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static const guchar dropper_bits[] = {
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  0xff, 0x8f, 0x01, 0xff, 0x77, 0x01, 0xff, 0xfb, 0x00, 0xff, 0xf8, 0x00,
  0x7f, 0xff, 0x00, 0xff, 0x7e, 0x01, 0xff, 0x9d, 0x01, 0xff, 0xd8, 0x01,
  0x7f, 0xd4, 0x01, 0x3f, 0xee, 0x01, 0x1f, 0xff, 0x01, 0x8f, 0xff, 0x01,
  0xc7, 0xff, 0x01, 0xe3, 0xff, 0x01, 0xf3, 0xff, 0x01, 0xfd, 0xff, 0x01,
  0xff, 0xff, 0x01, };

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static const guchar dropper_mask[] = {
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  0x00, 0x70, 0x00, 0x00, 0xf8, 0x00, 0x00, 0xfc, 0x01, 0x00, 0xff, 0x01,
  0x80, 0xff, 0x01, 0x00, 0xff, 0x00, 0x00, 0x7f, 0x00, 0x80, 0x3f, 0x00,
  0xc0, 0x3f, 0x00, 0xe0, 0x13, 0x00, 0xf0, 0x01, 0x00, 0xf8, 0x00, 0x00,
  0x7c, 0x00, 0x00, 0x3e, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x0d, 0x00, 0x00,
  0x02, 0x00, 0x00, };


/*
 *
 * The Sample Color
 *
 */
#define SAMPLE_WIDTH  64
#define SAMPLE_HEIGHT 28

static void color_sample_draw_sample (GtkColorSelection *colorsel, int which);
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static void color_sample_update_samples (GtkColorSelection *colorsel);
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static void
set_color_internal (GtkColorSelection *colorsel,
		    gdouble           *color)
{
  ColorSelectionPrivate *priv;
  gint i;
  
  priv = colorsel->private_data;
  priv->changing = TRUE;
  priv->color[COLORSEL_RED] = color[0];
  priv->color[COLORSEL_GREEN] = color[1];
  priv->color[COLORSEL_BLUE] = color[2];
  priv->color[COLORSEL_OPACITY] = color[3];
  gtk_rgb_to_hsv (priv->color[COLORSEL_RED],
		  priv->color[COLORSEL_GREEN],
		  priv->color[COLORSEL_BLUE],
		  &priv->color[COLORSEL_HUE],
		  &priv->color[COLORSEL_SATURATION],
		  &priv->color[COLORSEL_VALUE]);
  if (priv->default_set == FALSE)
    {
      for (i = 0; i < COLORSEL_NUM_CHANNELS; i++)
	priv->old_color[i] = priv->color[i];
    }
  priv->default_set = TRUE;
  priv->default_alpha_set = TRUE;
  update_color (colorsel);
}

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static void
set_color_icon (GdkDragContext *context,
		gdouble        *colors)
{
  GdkPixbuf *pixbuf;
  guint32 pixel;

  pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE,
			   8, 48, 32);

  pixel = (((UNSCALE (colors[COLORSEL_RED])   & 0xff00) << 16) |
	   ((UNSCALE (colors[COLORSEL_GREEN]) & 0xff00) << 8) |
	   ((UNSCALE (colors[COLORSEL_BLUE])  & 0xff00)));

  gdk_pixbuf_fill (pixbuf, pixel);
  
  gtk_drag_set_icon_pixbuf (context, pixbuf, -2, -2);
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  g_object_unref (pixbuf);
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}

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static void
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color_sample_drag_begin (GtkWidget      *widget,
			 GdkDragContext *context,
			 gpointer        data)
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{
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  GtkColorSelection *colorsel = data;
  ColorSelectionPrivate *priv;
  gdouble *colsrc;
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  priv = colorsel->private_data;
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  if (widget == priv->old_sample)
    colsrc = priv->old_color;
  else
    colsrc = priv->color;
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  set_color_icon (context, colsrc);
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}

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static void
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color_sample_drag_end (GtkWidget      *widget,
		       GdkDragContext *context,
		       gpointer        data)
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{
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  g_object_set_data (G_OBJECT (widget), I_("gtk-color-selection-drag-window"), NULL);
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}
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static void
color_sample_drop_handle (GtkWidget        *widget,
			  GdkDragContext   *context,
			  gint              x,
			  gint              y,
			  GtkSelectionData *selection_data,
			  guint             info,
			  guint             time,
			  gpointer          data)
{
  GtkColorSelection *colorsel = data;
  ColorSelectionPrivate *priv;
  guint16 *vals;
  gdouble color[4];
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  priv = colorsel->private_data;
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  /* This is currently a guint16 array of the format:
   * R
   * G
   * B
   * opacity
   */
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  if (selection_data->length < 0)
    return;
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  /* We accept drops with the wrong format, since the KDE color
   * chooser incorrectly drops application/x-color with format 8.
   */
  if (selection_data->length != 8)
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    {
      g_warning ("Received invalid color data\n");
      return;
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    }
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  vals = (guint16 *)selection_data->data;
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  if (widget == priv->cur_sample)
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    {
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      color[0] = (gdouble)vals[0] / 0xffff;
      color[1] = (gdouble)vals[1] / 0xffff;
      color[2] = (gdouble)vals[2] / 0xffff;
      color[3] = (gdouble)vals[3] / 0xffff;
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      set_color_internal (colorsel, color);
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    }
}

static void
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color_sample_drag_handle (GtkWidget        *widget,
			  GdkDragContext   *context,
			  GtkSelectionData *selection_data,
			  guint             info,
			  guint             time,
			  gpointer          data)
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{
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  GtkColorSelection *colorsel = data;
  ColorSelectionPrivate *priv;
  guint16 vals[4];
  gdouble *colsrc;
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  priv = colorsel->private_data;
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  if (widget == priv->old_sample)
    colsrc = priv->old_color;
  else
    colsrc = priv->color;
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  vals[0] = colsrc[COLORSEL_RED] * 0xffff;
  vals[1] = colsrc[COLORSEL_GREEN] * 0xffff;
  vals[2] = colsrc[COLORSEL_BLUE] * 0xffff;
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  vals[3] = priv->has_opacity ? colsrc[COLORSEL_OPACITY] * 0xffff : 0xffff;
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  gtk_selection_data_set (selection_data,
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			  gdk_atom_intern_static_string ("application/x-color"),
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			  16, (guchar *)vals, 8);
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}

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/* which = 0 means draw old sample, which = 1 means draw new */
static void
color_sample_draw_sample (GtkColorSelection *colorsel, int which)
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{
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  GtkWidget *da;
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  gint x, y, wid, heig, goff;
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  ColorSelectionPrivate *priv;
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  cairo_t *cr;
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  g_return_if_fail (colorsel != NULL);
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  priv = colorsel->private_data;
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  g_return_if_fail (priv->sample_area != NULL);
  if (!GTK_WIDGET_DRAWABLE (priv->sample_area))
    return;
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  if (which == 0)
    {
      da = priv->old_sample;
      goff = 0;
    }
  else
    {
      da = priv->cur_sample;
      goff =  priv->old_sample->allocation.width % 32;
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    }
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  cr = gdk_cairo_create (da->window);
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  wid = da->allocation.width;
  heig = da->allocation.height;
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  /* Below needs tweaking for non-power-of-two */  
#define CHECK_SIZE 16  
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  if (priv->has_opacity)
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    {
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      /* Draw checks in background */

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      cairo_set_source_rgb (cr, 0.5, 0.5, 0.5);
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      cairo_rectangle (cr, 0, 0, wid, heig);
      cairo_fill (cr);

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      cairo_set_source_rgb (cr, 0.75, 0.75, 0.75);
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      for (x = goff & -CHECK_SIZE; x < goff + wid; x += CHECK_SIZE)
	for (y = 0; y < heig; y += CHECK_SIZE)
	  if ((x / CHECK_SIZE + y / CHECK_SIZE) % 2 == 0)
	    cairo_rectangle (cr, x - goff, y, CHECK_SIZE, CHECK_SIZE);
      cairo_fill (cr);
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    }
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  if (which == 0)
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    {
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      cairo_set_source_rgba (cr,
			     priv->old_color[COLORSEL_RED], 
			     priv->old_color[COLORSEL_GREEN], 
			     priv->old_color[COLORSEL_BLUE],
			     priv->has_opacity ?
			        priv->old_color[COLORSEL_OPACITY] : 1.0);
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    }
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  else
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    {
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      cairo_set_source_rgba (cr,
			     priv->color[COLORSEL_RED], 
			     priv->color[COLORSEL_GREEN], 
			     priv->color[COLORSEL_BLUE],
			     priv->has_opacity ?
			       priv->color[COLORSEL_OPACITY] : 1.0);
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    }
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  cairo_rectangle (cr, 0, 0, wid, heig);
  cairo_fill (cr);

  cairo_destroy (cr);
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}


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static void
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color_sample_update_samples (GtkColorSelection *colorsel)
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{
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  ColorSelectionPrivate *priv = colorsel->private_data;
  gtk_widget_queue_draw (priv->old_sample);
  gtk_widget_queue_draw (priv->cur_sample);
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}
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static gboolean
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color_old_sample_expose (GtkWidget         *da,
			 GdkEventExpose    *event,
			 GtkColorSelection *colorsel)
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{
  color_sample_draw_sample (colorsel, 0);
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  return FALSE;
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}

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static gboolean
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color_cur_sample_expose (GtkWidget         *da,
			 GdkEventExpose    *event,
			 GtkColorSelection *colorsel)
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{
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  color_sample_draw_sample (colorsel, 1);
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  return FALSE;
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}
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static void
color_sample_setup_dnd (GtkColorSelection *colorsel, GtkWidget *sample)
{
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  static const GtkTargetEntry targets[] = {
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    { "application/x-color", 0 }
  };
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  ColorSelectionPrivate *priv;
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  priv = colorsel->private_data;
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  gtk_drag_source_set (sample,
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		       GDK_BUTTON1_MASK | GDK_BUTTON3_MASK,
		       targets, 1,
		       GDK_ACTION_COPY | GDK_ACTION_MOVE);
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  g_signal_connect (sample,
		    "drag_begin",
		    G_CALLBACK (color_sample_drag_begin),
		    colorsel);
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  if (sample == priv->cur_sample)
    {
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      gtk_drag_dest_set (sample,
			 GTK_DEST_DEFAULT_HIGHLIGHT |
			 GTK_DEST_DEFAULT_MOTION |
			 GTK_DEST_DEFAULT_DROP,
			 targets, 1,
			 GDK_ACTION_COPY);
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      g_signal_connect (sample,
			"drag_end",
			G_CALLBACK (color_sample_drag_end),
			colorsel);
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    }
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  g_signal_connect (sample,
		    "drag_data_get",
		    G_CALLBACK (color_sample_drag_handle),
		    colorsel);
  g_signal_connect (sample,
		    "drag_data_received",
		    G_CALLBACK (color_sample_drop_handle),
		    colorsel);
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}

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static void
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color_sample_new (GtkColorSelection *colorsel)
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{
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  ColorSelectionPrivate *priv;
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  priv = colorsel->private_data;
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  priv->sample_area = gtk_hbox_new (FALSE, 0);
  priv->old_sample = gtk_drawing_area_new ();
  priv->cur_sample = gtk_drawing_area_new ();
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  gtk_box_pack_start (GTK_BOX (priv->sample_area), priv->old_sample,
		      TRUE, TRUE, 0);
  gtk_box_pack_start (GTK_BOX (priv->sample_area), priv->cur_sample,
		      TRUE, TRUE, 0);
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  g_signal_connect (priv->old_sample, "expose_event",
		    G_CALLBACK (color_old_sample_expose),
		    colorsel);
  g_signal_connect (priv->cur_sample, "expose_event",
		    G_CALLBACK (color_cur_sample_expose),
		    colorsel);
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  color_sample_setup_dnd (colorsel, priv->old_sample);
  color_sample_setup_dnd (colorsel, priv->cur_sample);
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  gtk_widget_set_tooltip_text (priv->old_sample,
                        _("The previously-selected color, for comparison to the color you're selecting now. You can drag this color to a palette entry, or select this color as current by dragging it to the other color swatch alongside."));
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  gtk_widget_set_tooltip_text (priv->cur_sample,
                        _("The color you've chosen. You can drag this color to a palette entry to save it for use in the future."));
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  gtk_widget_show_all (priv->sample_area);
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}

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/*
 *
 * The palette area code
 *
 */
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#define CUSTOM_PALETTE_ENTRY_WIDTH   20
#define CUSTOM_PALETTE_ENTRY_HEIGHT  20
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static void
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palette_get_color (GtkWidget *drawing_area, gdouble *color)
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{
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  gdouble *color_val;
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  g_return_if_fail (color != NULL);
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  color_val = g_object_get_data (G_OBJECT (drawing_area), "color_val");
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  if (color_val == NULL)
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    {
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      /* Default to white for no good reason */
      color[0] = 1.0;
      color[1] = 1.0;
      color[2] = 1.0;
      color[3] = 1.0;
      return;
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    }
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  color[0] = color_val[0];
  color[1] = color_val[1];
  color[2] = color_val[2];
  color[3] = 1.0;
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}

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#define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11)
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static void
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palette_paint (GtkWidget    *drawing_area,
	       GdkRectangle *area,
	       gpointer      data)
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{
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  cairo_t *cr;
  gint focus_width;
    
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  if (drawing_area->window == NULL)
    return;
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  cr = gdk_cairo_create (drawing_area->window);
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  gdk_cairo_set_source_color (cr, &drawing_area->style->bg[GTK_STATE_NORMAL]);
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  gdk_cairo_rectangle (cr, area);
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  cairo_fill (cr);
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  if (GTK_WIDGET_HAS_FOCUS (drawing_area))
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    {
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      set_focus_line_attributes (drawing_area, cr, &focus_width);

      cairo_rectangle (cr,
		       focus_width / 2., focus_width / 2.,
		       drawing_area->allocation.width - focus_width,
		       drawing_area->allocation.height - focus_width);
      cairo_stroke (cr);
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    }
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  cairo_destroy (cr);
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}

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static void
set_focus_line_attributes (GtkWidget *drawing_area,
			   cairo_t   *cr,
			   gint      *focus_width)
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{
  gdouble color[4];
  gint8 *dash_list;
  
  gtk_widget_style_get (drawing_area,
			"focus-line-width", focus_width,
			"focus-line-pattern", (gchar *)&dash_list,
			NULL);
      
  palette_get_color (drawing_area, color);
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  if (INTENSITY (color[0], color[1], color[2]) > 0.5)
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    cairo_set_source_rgb (cr, 0., 0., 0.);
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  else
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    cairo_set_source_rgb (cr, 1., 1., 1.);
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  cairo_set_line_width (cr, *focus_width);
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  if (dash_list[0])
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    {
      gint n_dashes = strlen (dash_list);
      gdouble *dashes = g_new (gdouble, n_dashes);
      gdouble total_length = 0;
      gdouble dash_offset;
      gint i;

      for (i = 0; i < n_dashes; i++)
	{
	  dashes[i] = dash_list[i];
	  total_length += dash_list[i];
	}

      /* The dash offset here aligns the pattern to integer pixels
       * by starting the dash at the right side of the left border
       * Negative dash offsets in cairo don't work
       * (https://bugs.freedesktop.org/show_bug.cgi?id=2729)
       */
      dash_offset = - *focus_width / 2.;
      while (dash_offset < 0)
	dash_offset += total_length;
      
      cairo_set_dash (cr, dashes, n_dashes, dash_offset);
      g_free (dashes);
    }
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  g_free (dash_list);
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}
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static void
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palette_drag_begin (GtkWidget      *widget,
		    GdkDragContext *context,
		    gpointer        data)
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{
  gdouble colors[4];
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  palette_get_color (widget, colors);
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  set_color_icon (context, colors);
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}

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static void
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palette_drag_handle (GtkWidget        *widget,
		     GdkDragContext   *context,
		     GtkSelectionData *selection_data,
		     guint             info,
		     guint             time,
		     gpointer          data)
{
  guint16 vals[4];
  gdouble colsrc[4];
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  palette_get_color (widget, colsrc);
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  vals[0] = colsrc[COLORSEL_RED] * 0xffff;
  vals[1] = colsrc[COLORSEL_GREEN] * 0xffff;
  vals[2] = colsrc[COLORSEL_BLUE] * 0xffff;
  vals[3] = 0xffff;
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  gtk_selection_data_set (selection_data,
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			  gdk_atom_intern_static_string ("application/x-color"),
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			  16, (guchar *)vals, 8);
}

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static void
palette_drag_end (GtkWidget      *widget,
		  GdkDragContext *context,
		  gpointer        data)
{
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  g_object_set_data (G_OBJECT (widget), I_("gtk-color-selection-drag-window"), NULL);
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}

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static GdkColor *
get_current_colors (GtkColorSelection *colorsel)
{
  GtkSettings *settings;
  GdkColor *colors = NULL;
  gint n_colors = 0;
  gchar *palette;

  settings = gtk_widget_get_settings (GTK_WIDGET (colorsel));
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  g_object_get (settings,
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		"gtk-color-palette", &palette,
		NULL);
  
  if (!gtk_color_selection_palette_from_string (palette, &colors, &n_colors))
    {
      gtk_color_selection_palette_from_string (default_colors, &colors, &n_colors);
    }
  else
    {
      /* If there are less colors provided than the number of slots in the
       * color selection, we fill in the rest from the defaults.
       */
      if (n_colors < (GTK_CUSTOM_PALETTE_WIDTH * GTK_CUSTOM_PALETTE_HEIGHT))
	{
	  GdkColor *tmp_colors = colors;
	  gint tmp_n_colors = n_colors;
	  
	  gtk_color_selection_palette_from_string (default_colors, &colors, &n_colors);
	  memcpy (colors, tmp_colors, sizeof (GdkColor) * tmp_n_colors);

	  g_free (tmp_colors);
	}
    }

  g_assert (n_colors >= GTK_CUSTOM_PALETTE_WIDTH * GTK_CUSTOM_PALETTE_HEIGHT);
  g_free (palette);
  
  return colors;
}

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/* Changes the model color */
static void
palette_change_color (GtkWidget         *drawing_area,
                      GtkColorSelection *colorsel,
                      gdouble           *color)
{
  gint x, y;
  ColorSelectionPrivate *priv;
  GdkColor gdk_color;
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  GdkColor *current_colors;
  GdkScreen *screen;
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  g_return_if_fail (GTK_IS_COLOR_SELECTION (colorsel));
  g_return_if_fail (GTK_IS_DRAWING_AREA (drawing_area));
  
  priv = colorsel->private_data;
  
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  gdk_color.red = UNSCALE (color[0]);
  gdk_color.green = UNSCALE (color[1]);
  gdk_color.blue = UNSCALE (color[2]);
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  gdk_color.pixel = 0;
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  x = 0;
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  y = 0;			/* Quiet GCC */
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  while (x < GTK_CUSTOM_PALETTE_WIDTH)
    {
      y = 0;
      while (y < GTK_CUSTOM_PALETTE_HEIGHT)
        {
          if (priv->custom_palette[x][y] == drawing_area)
            goto out;
          
          ++y;
        }

      ++x;
    }

 out:
  
  g_assert (x < GTK_CUSTOM_PALETTE_WIDTH || y < GTK_CUSTOM_PALETTE_HEIGHT);

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  current_colors = get_current_colors (colorsel);
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  current_colors[y * GTK_CUSTOM_PALETTE_WIDTH + x] = gdk_color;

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  screen = gtk_widget_get_screen (GTK_WIDGET (colorsel));
  if (change_palette_hook != default_change_palette_func)
    (* change_palette_hook) (screen, current_colors, 
			     GTK_CUSTOM_PALETTE_WIDTH * GTK_CUSTOM_PALETTE_HEIGHT);
  else if (noscreen_change_palette_hook != default_noscreen_change_palette_func)
    {
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      if (screen != gdk_screen_get_default ())
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	g_warning ("gtk_color_selection_set_change_palette_hook used by widget is not on the default screen.");
      (* noscreen_change_palette_hook) (current_colors, 
					GTK_CUSTOM_PALETTE_WIDTH * GTK_CUSTOM_PALETTE_HEIGHT);
    }
  else
    (* change_palette_hook) (screen, current_colors, 
			     GTK_CUSTOM_PALETTE_WIDTH * GTK_CUSTOM_PALETTE_HEIGHT);

  g_free (current_colors);
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}

/* Changes the view color */
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static void
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palette_set_color (GtkWidget         *drawing_area,
		   GtkColorSelection *colorsel,
		   gdouble           *color)
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{
  gdouble *new_color = g_new (double, 4);
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  GdkColor gdk_color;
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  gdk_color.red = UNSCALE (color[0]);
  gdk_color.green = UNSCALE (color[1]);
  gdk_color.blue = UNSCALE (color[2]);
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  gtk_widget_modify_bg (drawing_area, GTK_STATE_NORMAL, &gdk_color);
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  if (GPOINTER_TO_INT (g_object_get_data (G_OBJECT (drawing_area), "color_set")) == 0)
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    {
      static const GtkTargetEntry targets[] = {
	{ "application/x-color", 0 }
      };
      gtk_drag_source_set (drawing_area,
			   GDK_BUTTON1_MASK | GDK_BUTTON3_MASK,
			   targets, 1,
			   GDK_ACTION_COPY | GDK_ACTION_MOVE);
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      g_signal_connect (drawing_area,
			"drag_begin",
			G_CALLBACK (palette_drag_begin),
			colorsel);
      g_signal_connect (drawing_area,
			"drag_data_get",
			G_CALLBACK (palette_drag_handle),
			colorsel);
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      g_object_set_data (G_OBJECT (drawing_area), I_("color_set"),
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			 GINT_TO_POINTER (1));
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    }
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  new_color[0] = color[0];
  new_color[1] = color[1];
  new_color[2] = color[2];
  new_color[3] = 1.0;
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  g_object_set_data_full (G_OBJECT (drawing_area), I_("color_val"), new_color, (GDestroyNotify)g_free);
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}

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static gboolean
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palette_expose (GtkWidget      *drawing_area,
		GdkEventExpose *event,
		gpointer        data)
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{
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  if (drawing_area->window == NULL)
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    return FALSE;
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  palette_paint (drawing_area, &(event->area), data);
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  return FALSE;
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}

static void
popup_position_func (GtkMenu   *menu,
                     gint      *x,
                     gint      *y,
                     gboolean  *push_in,
                     gpointer	user_data)
{
  GtkWidget *widget;
  GtkRequisition req;      
  gint root_x, root_y;
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  GdkScreen *screen;
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  widget = GTK_WIDGET (user_data);
  
  g_return_if_fail (GTK_WIDGET_REALIZED (widget));

  gdk_window_get_origin (widget->window, &root_x, &root_y);
  
  gtk_widget_size_request (GTK_WIDGET (menu), &req);

  /* Put corner of menu centered on color cell */
  *x = root_x + widget->allocation.width / 2;
  *y = root_y + widget->allocation.height / 2;

  /* Ensure sanity */
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  screen = gtk_widget_get_screen (widget);
  *x = CLAMP (*x, 0, MAX (0, gdk_screen_get_width (screen) - req.width));
  *y = CLAMP (*y, 0, MAX (0, gdk_screen_get_height (screen) - req.height));
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}

static void
save_color_selected (GtkWidget *menuitem,
                     gpointer   data)
{
  GtkColorSelection *colorsel;
  GtkWidget *drawing_area;
  ColorSelectionPrivate *priv;

  drawing_area = GTK_WIDGET (data);
  
  colorsel = GTK_COLOR_SELECTION (g_object_get_data (G_OBJECT (drawing_area),
                                                     "gtk-color-sel"));

  priv = colorsel->private_data;
  
  palette_change_color (drawing_area, colorsel, priv->color);  
}

static void
do_popup (GtkColorSelection *colorsel,
          GtkWidget         *drawing_area,
          guint32            timestamp)
{
  GtkWidget *menu;
  GtkWidget *mi;
  
  g_object_set_data (G_OBJECT (drawing_area),
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                     I_("gtk-color-sel"),
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                     colorsel);
  
  menu = gtk_menu_new ();

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  mi = gtk_menu_item_new_with_mnemonic (_("_Save color here"));
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  g_signal_connect (mi, "activate",
                    G_CALLBACK (save_color_selected),
                    drawing_area);
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  gtk_menu_shell_append (GTK_MENU_SHELL (menu), mi);

  gtk_widget_show_all (mi);

  gtk_menu_popup (GTK_MENU (menu), NULL, NULL,
                  popup_position_func, drawing_area,
                  3, timestamp);
}


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static gboolean
palette_enter (GtkWidget        *drawing_area,
	       GdkEventCrossing *event,
	       gpointer        data)
{
  g_object_set_data (G_OBJECT (drawing_area),
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		     I_("gtk-colorsel-have-pointer"),
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		     GUINT_TO_POINTER (TRUE));

  return FALSE;
}

static gboolean
palette_leave (GtkWidget        *drawing_area,
	       GdkEventCrossing *event,
	       gpointer        data)
{
  g_object_set_data (G_OBJECT (drawing_area),
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		     I_("gtk-colorsel-have-pointer"),
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		     NULL);

  return FALSE;
}

static gboolean
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palette_press (GtkWidget      *drawing_area,
	       GdkEventButton *event,
	       gpointer        data)
{
  GtkColorSelection *colorsel = GTK_COLOR_SELECTION (data);

  gtk_widget_grab_focus (drawing_area);
  
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  if (event->button == 3 &&
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      event->type == GDK_BUTTON_PRESS)
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    {
      do_popup (colorsel, drawing_area, event->time);
      return TRUE;
    }

  return FALSE;
}

static gboolean
palette_release (GtkWidget      *drawing_area,
		 GdkEventButton *event,
		 gpointer        data)
{
  GtkColorSelection *colorsel = GTK_COLOR_SELECTION (data);

  gtk_widget_grab_focus (drawing_area);

  if (event->button == 1 &&
      g_object_get_data (G_OBJECT (drawing_area),
			 "gtk-colorsel-have-pointer") != NULL)
    {
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      if (GPOINTER_TO_INT (g_object_get_data (G_OBJECT (drawing_area), "color_set")) != 0)
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        {
          gdouble color[4];
          palette_get_color (drawing_area, color);
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          set_color_internal (colorsel, color);
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        }
    }
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  return FALSE;
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}

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static void
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palette_drop_handle (GtkWidget        *widget,
		     GdkDragContext   *context,
		     gint              x,
		     gint              y,
		     GtkSelectionData *selection_data,
		     guint             info,
		     guint             time,
		     gpointer          data)
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{
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  GtkColorSelection *colorsel = GTK_COLOR_SELECTION (data);
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  guint16 *vals;
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  gdouble color[4];
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  if (selection_data->length < 0)
    return;
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  /* We accept drops with the wrong format, since the KDE color
   * chooser incorrectly drops application/x-color with format 8.
   */
  if (selection_data->length != 8)
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    {
      g_warning ("Received invalid color data\n");
      return;
    }
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  vals = (guint16 *)selection_data->data;
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  color[0] = (gdouble)vals[0] / 0xffff;
  color[1] = (gdouble)vals[1] / 0xffff;
  color[2] = (gdouble)vals[2] / 0xffff;
  color[3] = (gdouble)vals[3] / 0xffff;
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  palette_change_color (widget, colorsel, color);
  set_color_internal (colorsel, color);
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}

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static gint
palette_activate (GtkWidget   *widget,
		  GdkEventKey *event,
		  gpointer     data)
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{
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  /* should have a drawing area subclass with an activate signal */
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  if ((event->keyval == GDK_space) ||
      (event->keyval == GDK_Return) ||
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      (event->keyval == GDK_ISO_Enter) ||
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      (event->keyval == GDK_KP_Enter) ||
      (event->keyval == GDK_KP_Space))
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    {
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      if (GPOINTER_TO_INT (g_object_get_data (G_OBJECT (widget), "color_set")) != 0)
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        {
          gdouble color[4];
          palette_get_color (widget, color);
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          set_color_internal (GTK_COLOR_SELECTION (data), color);
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        }
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      return TRUE;
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    }
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  return FALSE;
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}

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static gboolean
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palette_popup (GtkWidget *widget,
               gpointer   data)
{
  GtkColorSelection *colorsel = GTK_COLOR_SELECTION (data);

  do_popup (colorsel, widget, GDK_CURRENT_TIME);
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  return TRUE;
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}
               

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static GtkWidget*
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palette_new (GtkColorSelection *colorsel)
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{
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  GtkWidget *retval;
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  ColorSelectionPrivate *priv;
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  static const GtkTargetEntry targets[] = {
    { "application/x-color", 0 }
  };
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  priv = colorsel->private_data;
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  retval = gtk_drawing_area_new ();
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  GTK_WIDGET_SET_FLAGS (retval, GTK_CAN_FOCUS);
  
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  g_object_set_data (G_OBJECT (retval), I_("color_set"), GINT_TO_POINTER (0)); 
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  gtk_widget_set_events (retval, GDK_BUTTON_PRESS_MASK
                         | GDK_BUTTON_RELEASE_MASK
                         | GDK_EXPOSURE_MASK
                         | GDK_ENTER_NOTIFY_MASK
                         | GDK_LEAVE_NOTIFY_MASK);
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  g_signal_connect (retval, "expose_event",
		    G_CALLBACK (palette_expose), colorsel);
  g_signal_connect (retval, "button_press_event",
		    G_CALLBACK (palette_press), colorsel);
  g_signal_connect (retval, "button_release_event",
		    G_CALLBACK (palette_release), colorsel);
  g_signal_connect (retval, "enter_notify_event",
		    G_CALLBACK (palette_enter), colorsel);
  g_signal_connect (retval, "leave_notify_event",
		    G_CALLBACK (palette_leave), colorsel);
  g_signal_connect (retval, "key_press_event",
		    G_CALLBACK (palette_activate), colorsel);
  g_signal_connect (retval, "popup_menu",
		    G_CALLBACK (palette_popup), colorsel);
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  gtk_drag_dest_set (retval,
		     GTK_DEST_DEFAULT_HIGHLIGHT |
		     GTK_DEST_DEFAULT_MOTION |
		     GTK_DEST_DEFAULT_DROP,
		     targets, 1,
		     GDK_ACTION_COPY);
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  g_signal_connect (retval, "drag_end",
                    G_CALLBACK (palette_drag_end), NULL);
  g_signal_connect (retval, "drag_data_received",
                    G_CALLBACK (palette_drop_handle), colorsel);
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  gtk_widget_set_tooltip_text (retval,
                        _("Click this palette entry to make it the current color. To change this entry, drag a color swatch here or right-click it and select \"Save color here.\""));
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  return retval;
}
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/*
 *
 * The actual GtkColorSelection widget
 *
 */
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static GdkCursor *
make_picker_cursor (GdkScreen *screen)
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{
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  GdkCursor *cursor;

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  cursor = gdk_cursor_new_from_name (gdk_screen_get_display (screen),
				     "color-picker");
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  if (!cursor)
    {
      GdkColor bg = { 0, 0xffff, 0xffff, 0xffff };
      GdkColor fg = { 0, 0x0000, 0x0000, 0x0000 };
      GdkWindow *window;
      GdkPixmap *pixmap, *mask;
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      window = gdk_screen_get_root_window (screen);
      
      pixmap =
	gdk_bitmap_create_from_data (window, (gchar *) dropper_bits,
				     DROPPER_WIDTH, DROPPER_HEIGHT);
      
      mask =
	gdk_bitmap_create_from_data (window, (gchar *) dropper_mask,
				     DROPPER_WIDTH, DROPPER_HEIGHT);
      
      cursor = gdk_cursor_new_from_pixmap (pixmap, mask, &fg, &bg,
					   DROPPER_X_HOT, DROPPER_Y_HOT);
      
      g_object_unref (pixmap);
      g_object_unref (mask);
    }
      
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  return cursor;
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}

static void
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grab_color_at_mouse (GdkScreen *screen,
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		     gint       x_root,
		     gint       y_root,
		     gpointer   data)
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{
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  GdkImage *image;
  guint32 pixel;
  GtkColorSelection *colorsel = data;
  ColorSelectionPrivate *priv;
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  GdkColor color;
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  GdkColormap *colormap = gdk_screen_get_system_colormap (screen);
  GdkWindow *root_window = gdk_screen_get_root_window (screen);
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  priv = colorsel->private_data;
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  image = gdk_drawable_get_image (root_window, x_root, y_root, 1, 1);
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  if (!image)
    {
      gint x, y;
      GdkDisplay *display = gdk_screen_get_display (screen);
      GdkWindow *window = gdk_display_get_window_at_pointer (display, &x, &y);
      if (!window)
	return;
      image = gdk_drawable_get_image (window, x, y, 1, 1);
      if (!image)
	return;
    }
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  pixel = gdk_image_get_pixel (image, 0, 0);
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  g_object_unref (image);
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  gdk_colormap_query_color (colormap, pixel, &color);
  
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  priv->color[COLORSEL_RED] = SCALE (color.red);
  priv->color[COLORSEL_GREEN] = SCALE (color.green);
  priv->color[COLORSEL_BLUE] = SCALE (color.blue);
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  gtk_rgb_to_hsv (priv->color[COLORSEL_RED],
		  priv->color[COLORSEL_GREEN],
		  priv->color[COLORSEL_BLUE],
		  &priv->color[COLORSEL_HUE],
		  &priv->color[COLORSEL_SATURATION],
		  &priv->color[COLORSEL_VALUE]);
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  update_color (colorsel);
}
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static void
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shutdown_eyedropper (GtkWidget *widget)
{
  GtkColorSelection *colorsel;
  ColorSelectionPrivate *priv;
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  GdkDisplay *display = gtk_widget_get_display (widget);
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  colorsel = GTK_COLOR_SELECTION (widget);
  priv = colorsel->private_data;    

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  if (priv->has_grab)
    {
      gdk_display_keyboard_ungrab (display, priv->grab_time);
      gdk_display_pointer_ungrab (display, priv->grab_time);
      gtk_grab_remove (priv->dropper_grab_widget);

      priv->has_grab = FALSE;
    }
}

static gboolean 
gtk_color_selection_grab_broken (GtkWidget          *widget,
				 GdkEventGrabBroken *event)
{
  shutdown_eyedropper (widget);

  return TRUE;
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}

static void
mouse_motion (GtkWidget      *invisible,
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	      GdkEventMotion *event,
	      gpointer        data)
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{
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  grab_color_at_mouse (gdk_event_get_screen ((GdkEvent *)event),
		       event->x_root, event->y_root, data); 
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}

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static gboolean
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mouse_release (GtkWidget      *invisible,
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	       GdkEventButton *event,
	       gpointer        data)
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{
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  /* GtkColorSelection *colorsel = data; */
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  if (event->button != 1)
    return FALSE;

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  grab_color_at_mouse (gdk_event_get_screen ((GdkEvent *)event),
		       event->x_root, event->y_root, data);
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  shutdown_eyedropper (GTK_WIDGET (data));
  
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  g_signal_handlers_disconnect_by_func (invisible,
					mouse_motion,
					data);
  g_signal_handlers_disconnect_by_func (invisible,
					mouse_release,
					data);
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  return TRUE;
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}
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/* Helper Functions */
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static gboolean mouse_press (GtkWidget      *invisible,
                             GdkEventButton *event,
                             gpointer        data);

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#define BIG_STEP 20

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static gboolean
key_press (GtkWidget   *invisible,
           GdkEventKey *event,
           gpointer     data)
{  
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  GdkDisplay *display = gtk_widget_get_display (invisible);
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  GdkScreen *screen = gdk_event_get_screen ((GdkEvent *)event);
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  guint state = event->state & gtk_accelerator_get_default_mod_mask ();
  gint x, y;
  gint dx, dy;

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  gdk_display_get_pointer (display, NULL, &x, &y, NULL);

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  dx = 0;
  dy = 0;

  switch (event->keyval) 
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    {
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    case GDK_space:
    case GDK_Return:
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    case GDK_ISO_Enter:
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    case GDK_KP_Enter:
    case GDK_KP_Space:
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      grab_color_at_mouse (screen, x, y, data);
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      /* fall through */

    case GDK_Escape:
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      shutdown_eyedropper (data);
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      g_signal_handlers_disconnect_by_func (invisible,
					    mouse_press,
					    data);
      g_signal_handlers_disconnect_by_func (invisible,
					    key_press,
					    data);
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      return TRUE;
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#if defined GDK_WINDOWING_X11 || defined GDK_WINDOWING_WIN32
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    case GDK_Up:
    case GDK_KP_Up:
      dy = state == GDK_MOD1_MASK ? -BIG_STEP : -1;
      break;

    case GDK_Down:
    case GDK_KP_Down:
      dy = state == GDK_MOD1_MASK ? BIG_STEP : 1;
      break;

    case GDK_Left:
    case GDK_KP_Left:
      dx = state == GDK_MOD1_MASK ? -BIG_STEP : -1;
      break;

    case GDK_Right:
    case GDK_KP_Right:
      dx = state == GDK_MOD1_MASK ? BIG_STEP : 1;
      break;
#endif

    default:
      return FALSE;
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