gtkcolorsel.c

gtk是linux一款强大的夸平台的图形化开发工具

/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * 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/. 
 */

#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <gdk/gdk.h>
#include "gtkcolorsel.h"
#include "gtkwindow.h"
#include "gtkhbbox.h"
#include "gtkintl.h"
#include "gtkdnd.h"
#include "gtkselection.h"

/*
 * If you change the way the color values are stored,
 * please make sure to update the drag & drop support so it sends
 * across all the color info (currently RGBA). - Elliot
 */

#ifndef M_PI
#define M_PI    3.14159265358979323846
#endif /* M_PI */

#define DEGTORAD(a) (2.0*M_PI*a/360.0)
#define SQR(a) (a*a)

#define TIMER_DELAY 300

#define CIRCLE_RADIUS 65

#define WHEEL_WIDTH   2*CIRCLE_RADIUS+2
#define WHEEL_HEIGHT  2*CIRCLE_RADIUS+2

#define VALUE_WIDTH   32
#define VALUE_HEIGHT  WHEEL_HEIGHT

#define SAMPLE_WIDTH  WHEEL_WIDTH+VALUE_WIDTH+5
#define SAMPLE_HEIGHT 28

static void gtk_color_selection_class_init (GtkColorSelectionClass *klass);
static void gtk_color_selection_set_arg    (GtkObject              *object,
					    GtkArg                 *arg,
					    guint                   arg_id);
static void gtk_color_selection_get_arg    (GtkObject              *object,
					    GtkArg                 *arg,
					    guint                   arg_id);
static void gtk_color_selection_init (GtkColorSelection *colorsel);
static void gtk_color_selection_dialog_class_init (GtkColorSelectionDialogClass *klass);
static void gtk_color_selection_dialog_init (GtkColorSelectionDialog *colorseldiag);

enum {
  COLOR_CHANGED,
  LAST_SIGNAL
};

enum {
  RGB_INPUTS     = 1 << 0,
  HSV_INPUTS     = 1 << 1,
  OPACITY_INPUTS = 1 << 2
};

enum {
  SCALE,
  ENTRY,
  BOTH
};

enum {
  HUE,
  SATURATION,
  VALUE,
  RED,
  GREEN,
  BLUE,
  OPACITY,
  NUM_CHANNELS
};

enum {
  ARG_0,
  ARG_UPDATE_POLICY,
  ARG_USE_OPACITY
};

typedef struct
{
  gchar *label;
  gfloat lower, upper, step_inc, page_inc;
  GtkSignalFunc updater;
} scale_val_type;


#define HSV_TO_RGB()  gtk_color_selection_hsv_to_rgb( \
                        colorsel->values[HUE], \
                        colorsel->values[SATURATION], \
                        colorsel->values[VALUE], \
                        &colorsel->values[RED], \
                        &colorsel->values[GREEN], \
                        &colorsel->values[BLUE])

#define RGB_TO_HSV()  gtk_color_selection_rgb_to_hsv( \
                        colorsel->values[RED], \
                        colorsel->values[GREEN], \
                        colorsel->values[BLUE], \
                        &colorsel->values[HUE], \
                        &colorsel->values[SATURATION], \
                        &colorsel->values[VALUE])


static void gtk_color_selection_hsv_updater       (GtkWidget         *widget,
                                                   gpointer           data);
static void gtk_color_selection_rgb_updater       (GtkWidget         *widget,
                                                   gpointer           data);
static void gtk_color_selection_opacity_updater   (GtkWidget         *widget,
                                                   gpointer           data);
static void gtk_color_selection_realize           (GtkWidget         *widget);
static void gtk_color_selection_unrealize         (GtkWidget         *widget);
static void gtk_color_selection_finalize          (GtkObject         *object);
static void gtk_color_selection_color_changed     (GtkColorSelection *colorsel);
static void gtk_color_selection_update_input      (GtkWidget         *scale,
                                                   GtkWidget         *entry,
                                                   gdouble            value);
static void gtk_color_selection_update_inputs     (GtkColorSelection *colorsel,
                                                   gint               inputs,
                                                   gint               which);
static void gtk_color_selection_update_value      (GtkColorSelection *colorsel,
                                                   gint               y);
static void gtk_color_selection_update_wheel      (GtkColorSelection *colorsel,
                                                   gint               x,
                                                   gint               y);
static void gtk_color_selection_value_resize      (GtkWidget          *widget,
                                                   gpointer            data);
static gint gtk_color_selection_value_events      (GtkWidget          *area,
                                                   GdkEvent           *event);
static gint gtk_color_selection_value_timeout     (GtkColorSelection  *colorsel);
static void gtk_color_selection_wheel_resize      (GtkWidget          *widget,
                                                   gpointer            data);
static gint gtk_color_selection_wheel_events      (GtkWidget          *area,
                                                   GdkEvent           *event);
static gint gtk_color_selection_wheel_timeout     (GtkColorSelection  *colorsel);
static void gtk_color_selection_sample_resize     (GtkWidget          *widget,
                                                   gpointer            data);
static void gtk_color_selection_drag_begin        (GtkWidget          *widget,
						   GdkDragContext     *context,
						   gpointer            data);
static void gtk_color_selection_drag_end          (GtkWidget          *widget,
						   GdkDragContext     *context,
						   gpointer            data);
static void gtk_color_selection_drop_handle       (GtkWidget          *widget, 
						   GdkDragContext     *context,
						   gint                x,
						   gint                y,
						   GtkSelectionData   *selection_data,
						   guint               info,
						   guint               time,
						   gpointer            data);
static void gtk_color_selection_drag_handle       (GtkWidget        *widget, 
						   GdkDragContext   *context,
						   GtkSelectionData *selection_data,
						   guint             info,
						   guint             time,
						   gpointer          data);
static void gtk_color_selection_draw_wheel_marker (GtkColorSelection  *colorsel);
static void gtk_color_selection_draw_wheel_frame  (GtkColorSelection  *colorsel);
static void gtk_color_selection_draw_value_marker (GtkColorSelection  *colorsel);
static void gtk_color_selection_draw_value_bar    (GtkColorSelection  *colorsel,
                                                   gint                resize);
static void gtk_color_selection_draw_wheel        (GtkColorSelection  *colorsel,
                                                   gint                resize);
static void gtk_color_selection_draw_sample       (GtkColorSelection  *colorsel,
                                                   gint                resize);

static gint gtk_color_selection_eval_wheel        (gint     x, gint     y,
					           gdouble cx, gdouble cy,
					           gdouble *h, gdouble *s);

static void gtk_color_selection_hsv_to_rgb        (gdouble  h, gdouble  s, gdouble  v,
				                   gdouble *r, gdouble *g, gdouble *b);
static void gtk_color_selection_rgb_to_hsv        (gdouble  r, gdouble  g, gdouble  b,
				                   gdouble *h, gdouble *s, gdouble *v);


static GtkVBoxClass *color_selection_parent_class = NULL;
static GtkWindowClass *color_selection_dialog_parent_class = NULL;


static guint color_selection_signals[LAST_SIGNAL] = {0};

static const gchar	*value_index_key = "gtk-value-index";


#define SF GtkSignalFunc


static const scale_val_type scale_vals[NUM_CHANNELS] =
{
  {N_("Hue:"),        0.0, 360.0, 1.00, 10.00, (SF) gtk_color_selection_hsv_updater},
  {N_("Saturation:"), 0.0,   1.0, 0.01,  0.01, (SF) gtk_color_selection_hsv_updater},
  {N_("Value:"),      0.0,   1.0, 0.01,  0.01, (SF) gtk_color_selection_hsv_updater},
  {N_("Red:"),        0.0,   1.0, 0.01,  0.01, (SF) gtk_color_selection_rgb_updater},
  {N_("Green:"),      0.0,   1.0, 0.01,  0.01, (SF) gtk_color_selection_rgb_updater},
  {N_("Blue:"),       0.0,   1.0, 0.01,  0.01, (SF) gtk_color_selection_rgb_updater},
  {N_("Opacity:"),    0.0,   1.0, 0.01,  0.01, (SF) gtk_color_selection_opacity_updater}
};

GtkType
gtk_color_selection_get_type (void)
{
  static GtkType color_selection_type = 0;

  if (!color_selection_type)
    {
      static const GtkTypeInfo colorsel_info =
      {
	"GtkColorSelection",
	sizeof (GtkColorSelection),
	sizeof (GtkColorSelectionClass),
	(GtkClassInitFunc) gtk_color_selection_class_init,
	(GtkObjectInitFunc) gtk_color_selection_init,
	/* reserved_1 */ NULL,
	/* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };

      color_selection_type = gtk_type_unique (GTK_TYPE_VBOX, &colorsel_info);
    }

  return color_selection_type;
}

static void
gtk_color_selection_class_init (GtkColorSelectionClass *klass)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkContainerClass *container_class;

  object_class = (GtkObjectClass*) klass;
  widget_class = (GtkWidgetClass*) klass;
  container_class = (GtkContainerClass*) klass;

  color_selection_parent_class = gtk_type_class (GTK_TYPE_VBOX);
  
  gtk_object_add_arg_type ("GtkColorSelection::policy", GTK_TYPE_UPDATE_TYPE,
			   GTK_ARG_READWRITE, ARG_UPDATE_POLICY);
  gtk_object_add_arg_type ("GtkColorSelection::use_opacity", GTK_TYPE_BOOL,
			   GTK_ARG_READWRITE, ARG_USE_OPACITY);
  
  color_selection_signals[COLOR_CHANGED] =
     gtk_signal_new ("color_changed",
	             GTK_RUN_FIRST,
                     object_class->type,
		     GTK_SIGNAL_OFFSET (GtkColorSelectionClass, color_changed),
                     gtk_marshal_NONE__NONE, GTK_TYPE_NONE, 0);

  gtk_object_class_add_signals (object_class, color_selection_signals, LAST_SIGNAL);

  object_class->set_arg = gtk_color_selection_set_arg;
  object_class->get_arg = gtk_color_selection_get_arg;
  object_class->finalize = gtk_color_selection_finalize;

  widget_class->realize = gtk_color_selection_realize;
  widget_class->unrealize = gtk_color_selection_unrealize;
}

static void
gtk_color_selection_init (GtkColorSelection *colorsel)
{
  GtkWidget *frame, *hbox, *vbox, *hbox2, *label, *table;
  GtkObject *adj;
  gint old_mask, n;
  gchar txt[32];

  for (n = RED; n <= OPACITY; n++)
    colorsel->values[n] = 1.0;

  RGB_TO_HSV ();

  for (n = HUE; n <= OPACITY; n++)
    colorsel->old_values[n] = colorsel->values[n];

  colorsel->wheel_gc = NULL;
  colorsel->value_gc = NULL;
  colorsel->sample_gc = NULL;
  colorsel->wheel_buf = NULL;
  colorsel->value_buf = NULL;
  colorsel->sample_buf = NULL;

  colorsel->use_opacity = FALSE;
  colorsel->timer_active = FALSE;
  colorsel->policy = GTK_UPDATE_CONTINUOUS;

  hbox = gtk_hbox_new (FALSE, 5);
  gtk_container_set_border_width (GTK_CONTAINER (hbox), 5);
  gtk_container_add (GTK_CONTAINER (colorsel), hbox);

  vbox = gtk_vbox_new (FALSE, 5);
  gtk_container_add (GTK_CONTAINER (hbox), vbox);
  gtk_widget_show (vbox);

  hbox2 = gtk_hbox_new (FALSE, 5);
  gtk_container_add (GTK_CONTAINER (vbox), hbox2);
  gtk_widget_show (hbox2);

  colorsel->wheel_area = gtk_preview_new (GTK_PREVIEW_COLOR);
  old_mask = gtk_widget_get_events(colorsel->wheel_area);
  gtk_widget_set_events (colorsel->wheel_area,
			 old_mask |
			 GDK_BUTTON_PRESS_MASK |
			 GDK_BUTTON_RELEASE_MASK |
			 GDK_BUTTON_MOTION_MASK |
			 GDK_POINTER_MOTION_HINT_MASK);
  gtk_preview_size (GTK_PREVIEW (colorsel->wheel_area), WHEEL_WIDTH, WHEEL_HEIGHT);
  gtk_preview_set_expand (GTK_PREVIEW (colorsel->wheel_area), TRUE);
  gtk_container_add (GTK_CONTAINER (hbox2), colorsel->wheel_area);
  gtk_widget_show (colorsel->wheel_area);

  old_mask = gtk_widget_get_events (colorsel->wheel_area);

  gtk_signal_connect (GTK_OBJECT (colorsel->wheel_area), "event",
    (SF) gtk_color_selection_wheel_events, (gpointer) colorsel->wheel_area);
  gtk_signal_connect_after (GTK_OBJECT (colorsel->wheel_area), "expose_event",
    (SF) gtk_color_selection_wheel_events, (gpointer) colorsel->wheel_area);
  gtk_signal_connect_after (GTK_OBJECT (colorsel->wheel_area), "size_allocate",
    (SF) gtk_color_selection_wheel_resize, (gpointer) colorsel->wheel_area);
  gtk_object_set_data (GTK_OBJECT (colorsel->wheel_area), "_GtkColorSelection", (gpointer) colorsel);

  frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
  gtk_container_set_border_width (GTK_CONTAINER (frame), 0);
  gtk_box_pack_start (GTK_BOX (hbox2), frame, FALSE, TRUE, 0);
  gtk_widget_show (frame);

  colorsel->value_area = gtk_preview_new (GTK_PREVIEW_COLOR);
  gtk_preview_size (GTK_PREVIEW (colorsel->value_area), VALUE_WIDTH, VALUE_HEIGHT);
  gtk_preview_set_expand (GTK_PREVIEW (colorsel->value_area), TRUE);
  gtk_container_add (GTK_CONTAINER (frame), colorsel->value_area);
  gtk_widget_show (colorsel->value_area);

  old_mask = gtk_widget_get_events (colorsel->value_area);
  gtk_widget_set_events (colorsel->value_area,
			 old_mask |
			 GDK_BUTTON_PRESS_MASK |
			 GDK_BUTTON_RELEASE_MASK |
			 GDK_BUTTON_MOTION_MASK |
			 GDK_POINTER_MOTION_HINT_MASK);

  gtk_signal_connect_after (GTK_OBJECT (colorsel->value_area), "expose_event",
    (SF) gtk_color_selection_value_events, (gpointer) colorsel->value_area);
  gtk_signal_connect_after (GTK_OBJECT (colorsel->value_area), "size_allocate",
    (SF) gtk_color_selection_value_resize, (gpointer) colorsel->value_area);
  gtk_signal_connect (GTK_OBJECT (colorsel->value_area), "event",
    (SF) gtk_color_selection_value_events, (gpointer) colorsel->value_area);
  gtk_object_set_data (GTK_OBJECT (colorsel->value_area), "_GtkColorSelection", (gpointer) colorsel);

  /* New/old color samples */
  /* ===================== */

  frame = gtk_frame_new (NULL);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
  gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, TRUE, 0);
  gtk_widget_show (frame);

/*  colorsel->sample_area_eb = gtk_button_new ();
  gtk_container_add (GTK_CONTAINER (frame), colorsel->sample_area_eb);
  gtk_widget_show (colorsel->sample_area_eb); */

  colorsel->sample_area = gtk_preview_new (GTK_PREVIEW_COLOR);
  gtk_preview_size (GTK_PREVIEW (colorsel->sample_area), SAMPLE_WIDTH, SAMPLE_HEIGHT);
  gtk_preview_set_expand (GTK_PREVIEW (colorsel->sample_area), TRUE);
  gtk_container_add (GTK_CONTAINER (frame),
		     colorsel->sample_area);
  gtk_widget_set_events(colorsel->sample_area,
		gtk_widget_get_events(colorsel->sample_area)
		| GDK_BUTTON_MOTION_MASK
		| GDK_BUTTON_PRESS_MASK
		| GDK_BUTTON_RELEASE_MASK
		| GDK_ENTER_NOTIFY_MASK
		| GDK_LEAVE_NOTIFY_MASK);
  gtk_widget_show (colorsel->sample_area);

  gtk_signal_connect_after (GTK_OBJECT (colorsel->sample_area),
			    "size_allocate",
			    GTK_SIGNAL_FUNC (gtk_color_selection_sample_resize),
			    colorsel->sample_area);
  gtk_object_set_data (GTK_OBJECT (colorsel->sample_area), "_GtkColorSelection", (gpointer) colorsel);

  table = gtk_table_new (NUM_CHANNELS, 3, FALSE);
  gtk_table_set_col_spacings (GTK_TABLE (table), 3);
  gtk_box_pack_start (GTK_BOX (hbox), table, FALSE, TRUE, 0);

  for (n = HUE; n <= OPACITY; n++)
    {
      label = gtk_label_new (_(scale_vals[n].label));
      gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
      gtk_table_attach_defaults (GTK_TABLE (table), label, 0, 1, n, n + 1);

      adj = gtk_adjustment_new (colorsel->values[n], scale_vals[n].lower,
				scale_vals[n].upper, scale_vals[n].step_inc,
                                scale_vals[n].page_inc, 0.0);
      colorsel->scales[n] = gtk_hscale_new (GTK_ADJUSTMENT (adj));
      gtk_widget_set_usize (colorsel->scales[n], 128, 0);
      gtk_scale_set_value_pos (GTK_SCALE (colorsel->scales[n]), GTK_POS_TOP);

      gtk_range_set_update_policy (GTK_RANGE (colorsel->scales[n]), colorsel->policy);
      gtk_scale_set_draw_value (GTK_SCALE (colorsel->scales[n]), FALSE);
      gtk_scale_set_digits (GTK_SCALE (colorsel->scales[n]), 2);
      gtk_table_attach_defaults (GTK_TABLE (table), colorsel->scales[n], 1, 2, n, n + 1);

      colorsel->entries[n] = gtk_entry_new ();
      gtk_widget_set_usize (colorsel->entries[n], 40, 0);
      sprintf (txt, "%.2f", colorsel->values[n]);
      gtk_entry_set_text (GTK_ENTRY (colorsel->entries[n]), txt);
      gtk_table_attach_defaults (GTK_TABLE (table), colorsel->entries[n], 2, 3, n, n + 1);

      if (n != OPACITY)