gtkviewport.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 "gtksignal.h"
#include "gtkviewport.h"

enum {
  ARG_0,
  ARG_HADJUSTMENT,
  ARG_VADJUSTMENT,
  ARG_SHADOW_TYPE
};


static void gtk_viewport_class_init               (GtkViewportClass *klass);
static void gtk_viewport_init                     (GtkViewport      *viewport);
static void gtk_viewport_destroy                  (GtkObject        *object);
static void gtk_viewport_finalize                 (GtkObject        *object);
static void gtk_viewport_set_arg		  (GtkObject        *object,
						   GtkArg           *arg,
						   guint             arg_id);
static void gtk_viewport_get_arg		  (GtkObject        *object,
						   GtkArg           *arg,
						   guint             arg_id);
static void gtk_viewport_set_scroll_adjustments	  (GtkViewport	    *viewport,
						   GtkAdjustment    *hadjustment,
						   GtkAdjustment    *vadjustment);
static void gtk_viewport_map                      (GtkWidget        *widget);
static void gtk_viewport_unmap                    (GtkWidget        *widget);
static void gtk_viewport_realize                  (GtkWidget        *widget);
static void gtk_viewport_unrealize                (GtkWidget        *widget);
static void gtk_viewport_paint                    (GtkWidget        *widget,
						   GdkRectangle     *area);
static void gtk_viewport_draw                     (GtkWidget        *widget,
						   GdkRectangle     *area);
static gint gtk_viewport_expose                   (GtkWidget        *widget,
						   GdkEventExpose   *event);
static void gtk_viewport_add                      (GtkContainer     *container,
						   GtkWidget        *widget);
static void gtk_viewport_size_request             (GtkWidget        *widget,
						   GtkRequisition   *requisition);
static void gtk_viewport_size_allocate            (GtkWidget        *widget,
						   GtkAllocation    *allocation);
static void gtk_viewport_adjustment_changed       (GtkAdjustment    *adjustment,
						   gpointer          data);
static void gtk_viewport_adjustment_value_changed (GtkAdjustment    *adjustment,
						   gpointer          data);
static void gtk_viewport_style_set                (GtkWidget *widget,
			                           GtkStyle  *previous_style);

static GtkBinClass *parent_class;

GtkType
gtk_viewport_get_type (void)
{
  static GtkType viewport_type = 0;

  if (!viewport_type)
    {
      static const GtkTypeInfo viewport_info =
      {
	"GtkViewport",
	sizeof (GtkViewport),
	sizeof (GtkViewportClass),
	(GtkClassInitFunc) gtk_viewport_class_init,
	(GtkObjectInitFunc) gtk_viewport_init,
	/* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };

      viewport_type = gtk_type_unique (GTK_TYPE_BIN, &viewport_info);
    }

  return viewport_type;
}

static void
gtk_viewport_class_init (GtkViewportClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkContainerClass *container_class;

  object_class = (GtkObjectClass*) class;
  widget_class = (GtkWidgetClass*) class;
  container_class = (GtkContainerClass*) class;
  parent_class = (GtkBinClass*) gtk_type_class (GTK_TYPE_BIN);

  gtk_object_add_arg_type ("GtkViewport::hadjustment",
			   GTK_TYPE_ADJUSTMENT,
			   GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
			   ARG_HADJUSTMENT);
  gtk_object_add_arg_type ("GtkViewport::vadjustment",
			   GTK_TYPE_ADJUSTMENT,
			   GTK_ARG_READWRITE | GTK_ARG_CONSTRUCT,
			   ARG_VADJUSTMENT);
  gtk_object_add_arg_type ("GtkViewport::shadow_type",
			   GTK_TYPE_SHADOW_TYPE,
			   GTK_ARG_READWRITE,
			   ARG_SHADOW_TYPE);

  object_class->set_arg = gtk_viewport_set_arg;
  object_class->get_arg = gtk_viewport_get_arg;
  object_class->destroy = gtk_viewport_destroy;
  object_class->finalize = gtk_viewport_finalize;
  
  widget_class->map = gtk_viewport_map;
  widget_class->unmap = gtk_viewport_unmap;
  widget_class->realize = gtk_viewport_realize;
  widget_class->unrealize = gtk_viewport_unrealize;
  widget_class->draw = gtk_viewport_draw;
  widget_class->expose_event = gtk_viewport_expose;
  widget_class->size_request = gtk_viewport_size_request;
  widget_class->size_allocate = gtk_viewport_size_allocate;
  widget_class->style_set = gtk_viewport_style_set;

  widget_class->set_scroll_adjustments_signal =
    gtk_signal_new ("set_scroll_adjustments",
		    GTK_RUN_LAST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkViewportClass, set_scroll_adjustments),
		    gtk_marshal_NONE__POINTER_POINTER,
		    GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
  
  container_class->add = gtk_viewport_add;

  class->set_scroll_adjustments = gtk_viewport_set_scroll_adjustments;
}

static void
gtk_viewport_set_arg (GtkObject        *object,
		      GtkArg           *arg,
		      guint             arg_id)
{
  GtkViewport *viewport;

  viewport = GTK_VIEWPORT (object);

  switch (arg_id)
    {
    case ARG_HADJUSTMENT:
      gtk_viewport_set_hadjustment (viewport, GTK_VALUE_POINTER (*arg));
      break;
    case ARG_VADJUSTMENT:
      gtk_viewport_set_vadjustment (viewport, GTK_VALUE_POINTER (*arg));
      break;
    case ARG_SHADOW_TYPE:
      gtk_viewport_set_shadow_type (viewport, GTK_VALUE_ENUM (*arg));
      break;
    default:
      break;
    }
}

static void
gtk_viewport_get_arg (GtkObject        *object,
		      GtkArg           *arg,
		      guint             arg_id)
{
  GtkViewport *viewport;

  viewport = GTK_VIEWPORT (object);

  switch (arg_id)
    {
    case ARG_HADJUSTMENT:
      GTK_VALUE_POINTER (*arg) = viewport->hadjustment;
      break;
    case ARG_VADJUSTMENT:
      GTK_VALUE_POINTER (*arg) = viewport->vadjustment;
      break;
    case ARG_SHADOW_TYPE:
      GTK_VALUE_ENUM (*arg) = viewport->shadow_type;
      break;
    default:
      arg->type = GTK_TYPE_INVALID;
      break;
    }
}

static void
gtk_viewport_init (GtkViewport *viewport)
{
  GTK_WIDGET_UNSET_FLAGS (viewport, GTK_NO_WINDOW);

  gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
  
  viewport->shadow_type = GTK_SHADOW_IN;
  viewport->view_window = NULL;
  viewport->bin_window = NULL;
  viewport->hadjustment = NULL;
  viewport->vadjustment = NULL;
}

GtkWidget*
gtk_viewport_new (GtkAdjustment *hadjustment,
		  GtkAdjustment *vadjustment)
{
  GtkWidget *viewport;

  viewport = gtk_widget_new (GTK_TYPE_VIEWPORT,
			     "hadjustment", hadjustment,
			     "vadjustment", vadjustment,
			     NULL);

  return viewport;
}

static void
gtk_viewport_destroy (GtkObject *object)
{
  GtkViewport *viewport = GTK_VIEWPORT (object);

  if (viewport->hadjustment)
    gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->hadjustment),
				   viewport);
  if (viewport->vadjustment)
    gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->vadjustment),
				   viewport);

  GTK_OBJECT_CLASS(parent_class)->destroy (object);
}

static void
gtk_viewport_finalize (GtkObject *object)
{
  GtkViewport *viewport = GTK_VIEWPORT (object);

  gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
  gtk_object_unref (GTK_OBJECT (viewport->vadjustment));

  GTK_OBJECT_CLASS(parent_class)->finalize (object);
}

GtkAdjustment*
gtk_viewport_get_hadjustment (GtkViewport *viewport)
{
  g_return_val_if_fail (viewport != NULL, NULL);
  g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);

  return viewport->hadjustment;
}

GtkAdjustment*
gtk_viewport_get_vadjustment (GtkViewport *viewport)
{
  g_return_val_if_fail (viewport != NULL, NULL);
  g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);

  return viewport->vadjustment;
}

void
gtk_viewport_set_hadjustment (GtkViewport   *viewport,
			      GtkAdjustment *adjustment)
{
  g_return_if_fail (viewport != NULL);
  g_return_if_fail (GTK_IS_VIEWPORT (viewport));
  if (adjustment)
    g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));

  if (viewport->hadjustment && viewport->hadjustment != adjustment)
    {
      gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->hadjustment),
				     (gpointer) viewport);
      gtk_object_unref (GTK_OBJECT (viewport->hadjustment));
    }

  if (!adjustment)
    adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
						     0.0, 0.0, 0.0));

  if (viewport->hadjustment != adjustment)
    {
      viewport->hadjustment = adjustment;
      gtk_object_ref (GTK_OBJECT (viewport->hadjustment));
      gtk_object_sink (GTK_OBJECT (viewport->hadjustment));
      
      gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
			  (GtkSignalFunc) gtk_viewport_adjustment_changed,
			  (gpointer) viewport);
      gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
			  (GtkSignalFunc) gtk_viewport_adjustment_value_changed,
			  (gpointer) viewport);

      gtk_viewport_adjustment_changed (adjustment, viewport);
    }
}

void
gtk_viewport_set_vadjustment (GtkViewport   *viewport,
			      GtkAdjustment *adjustment)
{
  g_return_if_fail (viewport != NULL);
  g_return_if_fail (GTK_IS_VIEWPORT (viewport));
  if (adjustment)
    g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));

  if (viewport->vadjustment && viewport->vadjustment != adjustment)
    {
      gtk_signal_disconnect_by_data (GTK_OBJECT (viewport->vadjustment),
				     (gpointer) viewport);
      gtk_object_unref (GTK_OBJECT (viewport->vadjustment));
    }

  if (!adjustment)
    adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0, 0.0, 0.0,
						     0.0, 0.0, 0.0));

  if (viewport->vadjustment != adjustment)
    {
      viewport->vadjustment = adjustment;
      gtk_object_ref (GTK_OBJECT (viewport->vadjustment));
      gtk_object_sink (GTK_OBJECT (viewport->vadjustment));
      
      gtk_signal_connect (GTK_OBJECT (adjustment), "changed",
			  (GtkSignalFunc) gtk_viewport_adjustment_changed,
			  (gpointer) viewport);
      gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
			  (GtkSignalFunc) gtk_viewport_adjustment_value_changed,
			  (gpointer) viewport);

      gtk_viewport_adjustment_changed (adjustment, viewport);
    }
}

static void
gtk_viewport_set_scroll_adjustments (GtkViewport      *viewport,
				     GtkAdjustment    *hadjustment,
				     GtkAdjustment    *vadjustment)
{
  if (viewport->hadjustment != hadjustment)
    gtk_viewport_set_hadjustment (viewport, hadjustment);
  if (viewport->vadjustment != vadjustment)
    gtk_viewport_set_vadjustment (viewport, vadjustment);
}

void
gtk_viewport_set_shadow_type (GtkViewport   *viewport,
			      GtkShadowType  type)
{
  g_return_if_fail (viewport != NULL);
  g_return_if_fail (GTK_IS_VIEWPORT (viewport));

  if ((GtkShadowType) viewport->shadow_type != type)
    {
      viewport->shadow_type = type;

      if (GTK_WIDGET_VISIBLE (viewport))
	{
	  gtk_widget_size_allocate (GTK_WIDGET (viewport), &(GTK_WIDGET (viewport)->allocation));
	  gtk_widget_queue_draw (GTK_WIDGET (viewport));
	}
    }
}


static void
gtk_viewport_map (GtkWidget *widget)
{
  GtkBin *bin;

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

  GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
  bin = GTK_BIN (widget);

  if (bin->child &&
      GTK_WIDGET_VISIBLE (bin->child) &&
      !GTK_WIDGET_MAPPED (bin->child))
    gtk_widget_map (bin->child);

  gdk_window_show (widget->window);
}

static void
gtk_viewport_unmap (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_VIEWPORT (widget));

  GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
  
  gdk_window_hide (widget->window);
}

static void
gtk_viewport_realize (GtkWidget *widget)
{
  GtkBin *bin;
  GtkViewport *viewport;
  GdkWindowAttr attributes;
  gint attributes_mask;
  gint event_mask;
  gint border_width;

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

  border_width = GTK_CONTAINER (widget)->border_width;