gtkarrow.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 "gtkarrow.h"


#define MIN_ARROW_SIZE  11

enum {
  ARG_0,
  ARG_ARROW_TYPE,
  ARG_SHADOW_TYPE
};


static void gtk_arrow_class_init (GtkArrowClass  *klass);
static void gtk_arrow_init       (GtkArrow       *arrow);
static gint gtk_arrow_expose     (GtkWidget      *widget,
				  GdkEventExpose *event);
static void gtk_arrow_set_arg    (GtkObject      *object,
				  GtkArg         *arg,
				  guint           arg_id);
static void gtk_arrow_get_arg    (GtkObject      *object,
				  GtkArg         *arg,
				  guint           arg_id);


GtkType
gtk_arrow_get_type (void)
{
  static GtkType arrow_type = 0;

  if (!arrow_type)
    {
      static const GtkTypeInfo arrow_info =
      {
	"GtkArrow",
	sizeof (GtkArrow),
	sizeof (GtkArrowClass),
	(GtkClassInitFunc) gtk_arrow_class_init,
	(GtkObjectInitFunc) gtk_arrow_init,
	/* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };

      arrow_type = gtk_type_unique (GTK_TYPE_MISC, &arrow_info);
    }

  return arrow_type;
}

static void
gtk_arrow_class_init (GtkArrowClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;

  object_class = (GtkObjectClass*) class;
  widget_class = (GtkWidgetClass*) class;

  gtk_object_add_arg_type ("GtkArrow::arrow_type", GTK_TYPE_ARROW_TYPE, GTK_ARG_READWRITE, ARG_ARROW_TYPE);
  gtk_object_add_arg_type ("GtkArrow::shadow_type", GTK_TYPE_SHADOW_TYPE, GTK_ARG_READWRITE, ARG_SHADOW_TYPE);

  object_class->set_arg = gtk_arrow_set_arg;
  object_class->get_arg = gtk_arrow_get_arg;

  widget_class->expose_event = gtk_arrow_expose;
}

static void
gtk_arrow_set_arg (GtkObject      *object,
		   GtkArg         *arg,
		   guint           arg_id)
{
  GtkArrow *arrow;

  arrow = GTK_ARROW (object);

  switch (arg_id)
    {
    case ARG_ARROW_TYPE:
      gtk_arrow_set (arrow,
		     GTK_VALUE_ENUM (*arg),
		     arrow->shadow_type);
      break;
    case ARG_SHADOW_TYPE:
      gtk_arrow_set (arrow,
		     arrow->arrow_type,
		     GTK_VALUE_ENUM (*arg));
      break;
    default:
      break;
    }
}

static void
gtk_arrow_get_arg (GtkObject      *object,
		   GtkArg         *arg,
		   guint           arg_id)
{
  GtkArrow *arrow;

  arrow = GTK_ARROW (object);
  switch (arg_id)
    {
    case ARG_ARROW_TYPE:
      GTK_VALUE_ENUM (*arg) = arrow->arrow_type;
      break;
    case ARG_SHADOW_TYPE:
      GTK_VALUE_ENUM (*arg) = arrow->shadow_type;
      break;
    default:
      arg->type = GTK_TYPE_INVALID;
      break;
    }
}

static void
gtk_arrow_init (GtkArrow *arrow)
{
  GTK_WIDGET_SET_FLAGS (arrow, GTK_NO_WINDOW);

  GTK_WIDGET (arrow)->requisition.width = MIN_ARROW_SIZE + GTK_MISC (arrow)->xpad * 2;
  GTK_WIDGET (arrow)->requisition.height = MIN_ARROW_SIZE + GTK_MISC (arrow)->ypad * 2;

  arrow->arrow_type = GTK_ARROW_RIGHT;
  arrow->shadow_type = GTK_SHADOW_OUT;
}

GtkWidget*
gtk_arrow_new (GtkArrowType  arrow_type,
	       GtkShadowType shadow_type)
{
  GtkArrow *arrow;

  arrow = gtk_type_new (GTK_TYPE_ARROW);

  arrow->arrow_type = arrow_type;
  arrow->shadow_type = shadow_type;

  return GTK_WIDGET (arrow);
}

void
gtk_arrow_set (GtkArrow      *arrow,
	       GtkArrowType   arrow_type,
	       GtkShadowType  shadow_type)
{
  g_return_if_fail (arrow != NULL);
  g_return_if_fail (GTK_IS_ARROW (arrow));

  if (((GtkArrowType) arrow->arrow_type != arrow_type) ||
      ((GtkShadowType) arrow->shadow_type != shadow_type))
    {
      arrow->arrow_type = arrow_type;
      arrow->shadow_type = shadow_type;

      if (GTK_WIDGET_DRAWABLE (arrow))
	gtk_widget_queue_clear (GTK_WIDGET (arrow));
    }
}


static gint
gtk_arrow_expose (GtkWidget      *widget,
		  GdkEventExpose *event)
{
  GtkArrow *arrow;
  GtkMisc *misc;
  GtkShadowType shadow_type;
  gint width, height;
  gint x, y;
  gint extent;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_ARROW (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      arrow = GTK_ARROW (widget);
      misc = GTK_MISC (widget);

      width = widget->allocation.width - misc->xpad * 2;
      height = widget->allocation.height - misc->ypad * 2;
      extent = MIN (width, height);

      x = ((widget->allocation.x + misc->xpad) * (1.0 - misc->xalign) +
	   (widget->allocation.x + widget->allocation.width - extent - misc->xpad) * misc->xalign);
      y = ((widget->allocation.y + misc->ypad) * (1.0 - misc->yalign) +
	   (widget->allocation.y + widget->allocation.height - extent - misc->ypad) * misc->yalign);

      shadow_type = arrow->shadow_type;

      if (widget->state == GTK_STATE_ACTIVE)
	{
          if (shadow_type == GTK_SHADOW_IN)
            shadow_type = GTK_SHADOW_OUT;
          else if (shadow_type == GTK_SHADOW_OUT)
            shadow_type = GTK_SHADOW_IN;
          else if (shadow_type == GTK_SHADOW_ETCHED_IN)
            shadow_type = GTK_SHADOW_ETCHED_OUT;
          else if (shadow_type == GTK_SHADOW_ETCHED_OUT)
            shadow_type = GTK_SHADOW_ETCHED_IN;
	}

      gtk_paint_arrow (widget->style, widget->window,
		       widget->state, shadow_type,
		       &event->area, widget, "arrow",
		       arrow->arrow_type, TRUE,
		       x, y, extent, extent);
    }

  return TRUE;
}