gtkcolorsel.c

gtk是linux一款强大的夸平台的图形化开发工具

	{
	  gtk_widget_show (label);
	  gtk_widget_show (colorsel->scales[n]);
	  gtk_widget_show (colorsel->entries[n]);
	}

      gtk_signal_connect_object (GTK_OBJECT (adj), "value_changed",
                                 scale_vals[n].updater, (gpointer) colorsel->scales[n]);
      gtk_object_set_data (GTK_OBJECT (colorsel->scales[n]), "_GtkColorSelection", (gpointer) colorsel);
      gtk_object_set_data (GTK_OBJECT (colorsel->scales[n]), value_index_key, GINT_TO_POINTER (n));
      gtk_signal_connect_object (GTK_OBJECT (colorsel->entries[n]), "changed",
                                 scale_vals[n].updater, (gpointer) colorsel->entries[n]);
      gtk_object_set_data (GTK_OBJECT (colorsel->entries[n]), "_GtkColorSelection", (gpointer) colorsel);
      gtk_object_set_data (GTK_OBJECT (colorsel->entries[n]), value_index_key, GINT_TO_POINTER (n));
    }

  colorsel->opacity_label = label;
  
  gtk_widget_show (table);
  gtk_widget_show (hbox);
}

static void
gtk_color_selection_set_arg (GtkObject *object,
			     GtkArg    *arg,
			     guint      arg_id)
{
  GtkColorSelection *color_selection = GTK_COLOR_SELECTION (object);
  
  switch (arg_id)
    {
    case ARG_UPDATE_POLICY:
      gtk_color_selection_set_update_policy (color_selection, GTK_VALUE_ENUM (*arg));
      break;
    case ARG_USE_OPACITY:
      gtk_color_selection_set_opacity (color_selection, GTK_VALUE_BOOL (*arg));
      break;  
    }
}

static void
gtk_color_selection_get_arg (GtkObject *object,
			     GtkArg    *arg,
			     guint      arg_id)
{
  GtkColorSelection *color_selection;
  
  color_selection = GTK_COLOR_SELECTION (object);
  
  switch (arg_id)
    {
    case ARG_UPDATE_POLICY:
      GTK_VALUE_ENUM (*arg) = color_selection->policy;
      break;
    case ARG_USE_OPACITY:
      GTK_VALUE_BOOL (*arg) = color_selection->use_opacity;
      break;
    default:
      break;
    }
}

GtkWidget*
gtk_color_selection_new (void)
{
  GtkColorSelection *colorsel;

  colorsel = gtk_type_new (GTK_TYPE_COLOR_SELECTION);

  return GTK_WIDGET (colorsel);
}

void
gtk_color_selection_set_update_policy (GtkColorSelection *colorsel,
				       GtkUpdateType      policy)
{
  gint n;

  g_return_if_fail (colorsel != NULL);

  if (policy != colorsel->policy)
    {
      colorsel->policy = policy;

      for (n = 0; n < NUM_CHANNELS; n++)
	gtk_range_set_update_policy (GTK_RANGE (colorsel->scales[n]), policy);
    }
}


void
gtk_color_selection_set_color (GtkColorSelection *colorsel,
			       gdouble           *color)
{
  gint n, i = 0;

  g_return_if_fail (colorsel != NULL);
  g_return_if_fail (GTK_IS_COLOR_SELECTION (colorsel));

  if (GTK_WIDGET_DRAWABLE (GTK_WIDGET (colorsel)))
    gtk_color_selection_draw_wheel_marker (colorsel);

  for (n = RED; n <= BLUE; n++)
    {
      colorsel->old_values[n] = colorsel->values[n];
      colorsel->values[n] = color[i++];
    }

  if (colorsel->use_opacity)
    {
      colorsel->old_values[OPACITY] = colorsel->values[OPACITY];
      colorsel->values[OPACITY] = color[i];
    }

  RGB_TO_HSV ();

  gtk_color_selection_update_inputs (colorsel, RGB_INPUTS | HSV_INPUTS | OPACITY_INPUTS, BOTH);

  if (GTK_WIDGET_DRAWABLE (GTK_WIDGET (colorsel)))
    {
      gtk_color_selection_draw_value_bar (colorsel, FALSE);
      gtk_color_selection_draw_sample (colorsel, FALSE);
      gtk_color_selection_draw_wheel_marker (colorsel);
    }
}

void
gtk_color_selection_get_color (GtkColorSelection *colorsel,
			       gdouble           *color)
{
  gint n, i = 0;

  g_return_if_fail (colorsel != NULL);
  g_return_if_fail (GTK_IS_COLOR_SELECTION (colorsel));

  for (n = RED; n <= BLUE; n++)
    color[i++] = colorsel->values[n];
  if (colorsel->use_opacity)
    color[i] = colorsel->values[OPACITY];
}

static void
gtk_color_selection_realize (GtkWidget         *widget)
{
  GtkColorSelection *colorsel;

  static const GtkTargetEntry targets[] = {
    { "application/x-color", 0 }
  };

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_COLOR_SELECTION (widget));

  colorsel = GTK_COLOR_SELECTION (widget);

  if (GTK_WIDGET_CLASS (color_selection_parent_class)->realize)
    (*GTK_WIDGET_CLASS (color_selection_parent_class)->realize) (widget);

  gtk_drag_dest_set (colorsel->sample_area,
		       GTK_DEST_DEFAULT_HIGHLIGHT |
		       GTK_DEST_DEFAULT_MOTION |
		       GTK_DEST_DEFAULT_DROP,
		       targets, 1,
		       GDK_ACTION_COPY);

  gtk_drag_source_set (colorsel->sample_area, 
		       GDK_BUTTON1_MASK | GDK_BUTTON3_MASK,
		       targets, 1,
		       GDK_ACTION_COPY | GDK_ACTION_MOVE);

  gtk_signal_connect (GTK_OBJECT (colorsel->sample_area),
		      "drag_begin",
		      GTK_SIGNAL_FUNC (gtk_color_selection_drag_begin),
		      colorsel);
  gtk_signal_connect (GTK_OBJECT (colorsel->sample_area),
		      "drag_end",
		      GTK_SIGNAL_FUNC (gtk_color_selection_drag_end),
		      colorsel);
  gtk_signal_connect (GTK_OBJECT (colorsel->sample_area),
		      "drag_data_get",
		      GTK_SIGNAL_FUNC (gtk_color_selection_drag_handle),
		      colorsel);
  gtk_signal_connect (GTK_OBJECT (colorsel->sample_area),
		      "drag_data_received",
		      GTK_SIGNAL_FUNC (gtk_color_selection_drop_handle),
		      colorsel);
}

static void
gtk_color_selection_unrealize (GtkWidget      *widget)
{
  GtkColorSelection *colorsel;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_COLOR_SELECTION (widget));

  colorsel = GTK_COLOR_SELECTION (widget);

  if (colorsel->value_gc != NULL)
    {
      gdk_gc_unref (colorsel->value_gc);
      colorsel->value_gc = NULL;
    }
  if (colorsel->wheel_gc != NULL)
    {
      gdk_gc_unref (colorsel->wheel_gc);
      colorsel->wheel_gc = NULL;
    }
  if (colorsel->sample_gc != NULL)
    {
      gdk_gc_unref (colorsel->sample_gc);
      colorsel->sample_gc = NULL;
    }

  (* GTK_WIDGET_CLASS (color_selection_parent_class)->unrealize) (widget);
}

static void
gtk_color_selection_finalize (GtkObject *object)
{
  GtkColorSelection *colorsel;

  g_return_if_fail (object != NULL);
  g_return_if_fail (GTK_IS_COLOR_SELECTION (object));

  colorsel = GTK_COLOR_SELECTION (object);

  if (colorsel->wheel_buf != NULL)
    g_free (colorsel->wheel_buf);
  if (colorsel->value_buf != NULL)
    g_free (colorsel->value_buf);
  if (colorsel->sample_buf != NULL)
    g_free (colorsel->sample_buf);

  (*GTK_OBJECT_CLASS (color_selection_parent_class)->finalize) (object);
}

static void
gtk_color_selection_color_changed (GtkColorSelection *colorsel)
{
  gtk_signal_emit (GTK_OBJECT (colorsel), color_selection_signals[COLOR_CHANGED]);
}

static void
gtk_color_selection_update_input (GtkWidget *scale,
                                  GtkWidget *entry,
                                  gdouble    value)
{
  GtkAdjustment *adj;
  gchar txt[32];

  if (scale != NULL)
    {
      adj = gtk_range_get_adjustment (GTK_RANGE (scale));
      adj->value = (gfloat) value;
      gtk_signal_handler_block_by_data (GTK_OBJECT (adj), (gpointer) scale);
      gtk_signal_emit_by_name (GTK_OBJECT (adj), "value_changed");
      gtk_range_slider_update (GTK_RANGE (scale));
      gtk_signal_handler_unblock_by_data (GTK_OBJECT (adj), (gpointer) scale);
    }

  if (entry != NULL)
    {
      gtk_signal_handler_block_by_data (GTK_OBJECT (entry), (gpointer) entry);
      sprintf (txt, "%.2f", value);
      gtk_entry_set_text (GTK_ENTRY (entry), txt);
      gtk_signal_handler_unblock_by_data (GTK_OBJECT (entry), (gpointer) entry);
    }
}

static void
gtk_color_selection_update_inputs (GtkColorSelection *colorsel,
                                   gint               inputs,
                                   gint               which)
{
  gint n;

  switch (which)
    {
    case SCALE:
      if ((inputs & RGB_INPUTS) != 0)
	for (n = RED; n <= BLUE; n++)
	  gtk_color_selection_update_input (colorsel->scales[n], NULL,
					    colorsel->values[n]);
      if ((inputs & HSV_INPUTS) != 0)
	for (n = HUE; n <= VALUE; n++)
	  gtk_color_selection_update_input (colorsel->scales[n], NULL,
					    colorsel->values[n]);
      if ((inputs & OPACITY_INPUTS) != 0)
	gtk_color_selection_update_input(colorsel->scales[OPACITY], NULL,
					 colorsel->values[OPACITY]);
      break;
    case ENTRY:
      if ((inputs & RGB_INPUTS) != 0)
	for (n = RED; n <= BLUE; n++)
	  gtk_color_selection_update_input (NULL, colorsel->entries[n], colorsel->values[n]);
      if ((inputs & HSV_INPUTS) != 0)
	for (n = HUE; n <= VALUE; n++)
	  gtk_color_selection_update_input (NULL, colorsel->entries[n], colorsel->values[n]);
      if ((inputs & OPACITY_INPUTS) != 0)
	gtk_color_selection_update_input(NULL, colorsel->entries[OPACITY], colorsel->values[OPACITY]);
      break;
    default:
      if ((inputs & RGB_INPUTS) != 0)
	for (n = RED; n <= BLUE; n++)
	  gtk_color_selection_update_input (colorsel->scales[n], colorsel->entries[n],
                                            colorsel->values[n]);
      if ((inputs & HSV_INPUTS) != 0)
	for (n = HUE; n <= VALUE; n++)
	  gtk_color_selection_update_input (colorsel->scales[n], colorsel->entries[n],
                                            colorsel->values[n]);
      if ((inputs & OPACITY_INPUTS) != 0)
	gtk_color_selection_update_input(colorsel->scales[OPACITY], colorsel->entries[OPACITY],
					 colorsel->values[OPACITY]);
      break;
    }
}

static void
gtk_color_selection_hsv_updater (GtkWidget *widget,
                                 gpointer   data)
{
  GtkColorSelection *colorsel;
  GtkAdjustment *adj;
  gdouble newvalue;
  gint i, which = SCALE;

  if (GTK_WIDGET_DRAWABLE (GTK_WIDGET (widget)))
    {
      colorsel = (GtkColorSelection*) gtk_object_get_data (GTK_OBJECT (widget), "_GtkColorSelection");
      i = GPOINTER_TO_INT (gtk_object_get_data (GTK_OBJECT (widget), value_index_key));

      if (GTK_IS_SCALE (widget))
	{
	  adj = gtk_range_get_adjustment (GTK_RANGE (GTK_SCALE (widget)));
	  newvalue = (gdouble) adj->value;
	  which = ENTRY;
	}
      else
	newvalue = (gdouble) atof (gtk_entry_get_text (GTK_ENTRY (widget)));

      if (i == VALUE)
	{
	  gtk_color_selection_draw_value_marker (colorsel);
	  colorsel->values[i] = newvalue;

	  HSV_TO_RGB ();

	  gtk_color_selection_draw_value_marker (colorsel);
	}
      else
	{
	  gtk_color_selection_draw_wheel_marker (colorsel);
	  colorsel->values[i] = newvalue;

	  HSV_TO_RGB ();

	  gtk_color_selection_draw_wheel_marker (colorsel);
	  gtk_color_selection_draw_value_bar (colorsel, FALSE);
	}

      gtk_color_selection_draw_sample (colorsel, FALSE);
      gtk_color_selection_color_changed (colorsel);
      gtk_color_selection_update_inputs (colorsel, HSV_INPUTS, which);
      gtk_color_selection_update_inputs (colorsel, RGB_INPUTS, BOTH);
    }
}

static void
gtk_color_selection_rgb_updater (GtkWidget *widget,
                                 gpointer   data)
{
  GtkColorSelection *colorsel;
  GtkAdjustment *adj;
  gdouble newvalue;
  gint i, which = SCALE;

  if (GTK_WIDGET_DRAWABLE (GTK_WIDGET (widget)))
    {
      colorsel = (GtkColorSelection*) gtk_object_get_data (GTK_OBJECT (widget), "_GtkColorSelection");
      i = GPOINTER_TO_INT (gtk_object_get_data (GTK_OBJECT (widget), value_index_key));

      if (GTK_IS_SCALE (widget))
	{
	  adj = gtk_range_get_adjustment (GTK_RANGE (GTK_SCALE (widget)));
	  newvalue = (gdouble) adj->value;
	  which = ENTRY;
	}
      else
	newvalue = (gdouble) atof (gtk_entry_get_text (GTK_ENTRY (widget)));

      gtk_color_selection_draw_wheel_marker (colorsel);

      colorsel->values[i] = newvalue;
      RGB_TO_HSV ();

      gtk_color_selection_draw_wheel_marker (colorsel);
      gtk_color_selection_draw_value_bar (colorsel, FALSE);
      gtk_color_selection_draw_sample (colorsel, FALSE);
      gtk_color_selection_color_changed (colorsel);
      gtk_color_selection_update_inputs (colorsel, RGB_INPUTS, which);
      gtk_color_selection_update_inputs (colorsel, HSV_INPUTS, BOTH);
    }
}

static void
gtk_color_selection_opacity_updater (GtkWidget *widget,
                                     gpointer   data)
{
  GtkColorSelection *colorsel;
  GtkAdjustment *adj;

  colorsel = (GtkColorSelection*) gtk_object_get_data (GTK_OBJECT (widget), "_GtkColorSelection");

  if (GTK_IS_SCALE (widget))
    {
      adj = gtk_range_get_adjustment (GTK_RANGE (widget));
      colorsel->values[OPACITY] = (gdouble) adj->value;
      gtk_color_selection_update_input (NULL, colorsel->entries[OPACITY], colorsel->values[OPACITY]);
    }
  else
    {
      colorsel->values[OPACITY] = (gdouble) atof (gtk_entry_get_text (GTK_ENTRY (widget)));
      gtk_color_selection_update_input (colorsel->scales[OPACITY], NULL, colorsel->values[OPACITY]);
    }

  gtk_color_selection_draw_sample (colorsel, FALSE);
  gtk_color_selection_color_changed (colorsel);
}

void
gtk_color_selection_set_opacity (GtkColorSelection *colorsel,
                                 gint               use_opacity)
{
  g_return_if_fail (colorsel != NULL);

  colorsel->use_opacity = use_opacity;

  if (!use_opacity && GTK_WIDGET_VISIBLE (colorsel->scales[OPACITY]))
    {