gtk/gtkaspectframe.c - external/github.com/GNOME/gtk.git - Git at Google

 /* GTK - The GIMP Toolkit
  * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
  *
  * GtkAspectFrame: Ensure that the child window has a specified aspect ratio
  *    or, if obey_child, has the same aspect ratio as its requested size
  *
  *     Copyright Owen Taylor                          4/9/97
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  */

 /*
  * Modified by the GTK+ Team and others 1997-2001.  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/.
  */

 /**
  * SECTION:gtkaspectframe
  * @Short_description: A frame that constrains its child to a particular aspect ratio
  * @Title: GtkAspectFrame
  *
  * The #GtkAspectFrame is useful when you want
  * pack a widget so that it can resize but always retains
  * the same aspect ratio. For instance, one might be
  * drawing a small preview of a larger image. #GtkAspectFrame
  * derives from #GtkFrame, so it can draw a label and
  * a frame around the child. The frame will be
  * "shrink-wrapped" to the size of the child.
  */

 #include "config.h"

 #include "gtkaspectframe.h"

 #include "gtksizerequest.h"

 #include "gtkprivate.h"
 #include "gtkintl.h"


 struct _GtkAspectFramePrivate
 {
   GtkAllocation center_allocation;

   gboolean      obey_child;
   gfloat        xalign;
   gfloat        yalign;
   gfloat        ratio;
 };


 enum {
   PROP_0,
   PROP_XALIGN,
   PROP_YALIGN,
   PROP_RATIO,
   PROP_OBEY_CHILD
 };

 static void gtk_aspect_frame_set_property (GObject         *object,
 					   guint            prop_id,
 					   const GValue    *value,
 					   GParamSpec      *pspec);
 static void gtk_aspect_frame_get_property (GObject         *object,
 					   guint            prop_id,
 					   GValue          *value,
 					   GParamSpec      *pspec);
 static void gtk_aspect_frame_compute_child_allocation (GtkFrame            *frame,
 						       GtkAllocation       *child_allocation);

 #define MAX_RATIO 10000.0
 #define MIN_RATIO 0.0001

 G_DEFINE_TYPE (GtkAspectFrame, gtk_aspect_frame, GTK_TYPE_FRAME)

 static void
 gtk_aspect_frame_class_init (GtkAspectFrameClass *class)
 {
   GObjectClass *gobject_class;
   GtkFrameClass *frame_class;

   gobject_class = (GObjectClass*) class;
   frame_class = (GtkFrameClass*) class;

   gobject_class->set_property = gtk_aspect_frame_set_property;
   gobject_class->get_property = gtk_aspect_frame_get_property;

   frame_class->compute_child_allocation = gtk_aspect_frame_compute_child_allocation;

   g_object_class_install_property (gobject_class,
                                    PROP_XALIGN,
                                    g_param_spec_float ("xalign",
                                                        P_("Horizontal Alignment"),
                                                        P_("X alignment of the child"),
                                                        0.0, 1.0, 0.5,
                                                        GTK_PARAM_READWRITE));
   g_object_class_install_property (gobject_class,
                                    PROP_YALIGN,
                                    g_param_spec_float ("yalign",
                                                        P_("Vertical Alignment"),
                                                        P_("Y alignment of the child"),
                                                        0.0, 1.0, 0.5,
                                                        GTK_PARAM_READWRITE));
   g_object_class_install_property (gobject_class,
                                    PROP_RATIO,
                                    g_param_spec_float ("ratio",
                                                        P_("Ratio"),
                                                        P_("Aspect ratio if obey_child is FALSE"),
                                                        MIN_RATIO, MAX_RATIO, 1.0,
                                                        GTK_PARAM_READWRITE));
   g_object_class_install_property (gobject_class,
                                    PROP_OBEY_CHILD,
                                    g_param_spec_boolean ("obey-child",
                                                          P_("Obey child"),
                                                          P_("Force aspect ratio to match that of the frame's child"),
                                                          TRUE,
                                                          GTK_PARAM_READWRITE));

   g_type_class_add_private (class, sizeof (GtkAspectFramePrivate));
 }

 static void
 gtk_aspect_frame_init (GtkAspectFrame *aspect_frame)
 {
   GtkAspectFramePrivate *priv;

   aspect_frame->priv = G_TYPE_INSTANCE_GET_PRIVATE (aspect_frame,
                                                     GTK_TYPE_ASPECT_FRAME,
                                                     GtkAspectFramePrivate);
   priv = aspect_frame->priv;

   priv->xalign = 0.5;
   priv->yalign = 0.5;
   priv->ratio = 1.0;
   priv->obey_child = TRUE;
 }

 static void
 gtk_aspect_frame_set_property (GObject         *object,
 			       guint            prop_id,
 			       const GValue    *value,
 			       GParamSpec      *pspec)
 {
   GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (object);
   GtkAspectFramePrivate *priv = aspect_frame->priv;

   switch (prop_id)
     {
       /* g_object_notify is handled by the _frame_set function */
     case PROP_XALIGN:
       gtk_aspect_frame_set (aspect_frame,
 			    g_value_get_float (value),
 			    priv->yalign,
 			    priv->ratio,
 			    priv->obey_child);
       break;
     case PROP_YALIGN:
       gtk_aspect_frame_set (aspect_frame,
 			    priv->xalign,
 			    g_value_get_float (value),
 			    priv->ratio,
 			    priv->obey_child);
       break;
     case PROP_RATIO:
       gtk_aspect_frame_set (aspect_frame,
 			    priv->xalign,
 			    priv->yalign,
 			    g_value_get_float (value),
 			    priv->obey_child);
       break;
     case PROP_OBEY_CHILD:
       gtk_aspect_frame_set (aspect_frame,
 			    priv->xalign,
 			    priv->yalign,
 			    priv->ratio,
 			    g_value_get_boolean (value));
       break;
     default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
     }
 }

 static void
 gtk_aspect_frame_get_property (GObject         *object,
 			       guint            prop_id,
 			       GValue          *value,
 			       GParamSpec      *pspec)
 {
   GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (object);
   GtkAspectFramePrivate *priv = aspect_frame->priv;

   switch (prop_id)
     {
     case PROP_XALIGN:
       g_value_set_float (value, priv->xalign);
       break;
     case PROP_YALIGN:
       g_value_set_float (value, priv->yalign);
       break;
     case PROP_RATIO:
       g_value_set_float (value, priv->ratio);
       break;
     case PROP_OBEY_CHILD:
       g_value_set_boolean (value, priv->obey_child);
       break;
     default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
     }
 }

 /**
  * gtk_aspect_frame_new:
  * @label: Label text.
  * @xalign: Horizontal alignment of the child within the allocation of
  *  the #GtkAspectFrame. This ranges from 0.0 (left aligned)
  *  to 1.0 (right aligned)
  * @yalign: Vertical alignment of the child within the allocation of
  *  the #GtkAspectFrame. This ranges from 0.0 (top aligned)
  *  to 1.0 (bottom aligned)
  * @ratio: The desired aspect ratio.
  * @obey_child: If %TRUE, @ratio is ignored, and the aspect
  *  ratio is taken from the requistion of the child.
  *
  * Create a new #GtkAspectFrame.
  *
  * Returns: the new #GtkAspectFrame.
  */
 GtkWidget*
 gtk_aspect_frame_new (const gchar *label,
 		      gfloat       xalign,
 		      gfloat       yalign,
 		      gfloat       ratio,
 		      gboolean     obey_child)
 {
   GtkAspectFrame *aspect_frame;
   GtkAspectFramePrivate *priv;

   aspect_frame = g_object_new (GTK_TYPE_ASPECT_FRAME, NULL);

   priv = aspect_frame->priv;

   priv->xalign = CLAMP (xalign, 0.0, 1.0);
   priv->yalign = CLAMP (yalign, 0.0, 1.0);
   priv->ratio = CLAMP (ratio, MIN_RATIO, MAX_RATIO);
   priv->obey_child = obey_child != FALSE;

   gtk_frame_set_label (GTK_FRAME(aspect_frame), label);

   return GTK_WIDGET (aspect_frame);
 }

 /**
  * gtk_aspect_frame_set:
  * @aspect_frame: a #GtkAspectFrame
  * @xalign: Horizontal alignment of the child within the allocation of
  *  the #GtkAspectFrame. This ranges from 0.0 (left aligned)
  *  to 1.0 (right aligned)
  * @yalign: Vertical alignment of the child within the allocation of
  *  the #GtkAspectFrame. This ranges from 0.0 (top aligned)
  *  to 1.0 (bottom aligned)
  * @ratio: The desired aspect ratio.
  * @obey_child: If %TRUE, @ratio is ignored, and the aspect
  *  ratio is taken from the requistion of the child.
  *
  * Set parameters for an existing #GtkAspectFrame.
  */
 void
 gtk_aspect_frame_set (GtkAspectFrame *aspect_frame,
 		      gfloat          xalign,
 		      gfloat          yalign,
 		      gfloat          ratio,
 		      gboolean        obey_child)
 {
   GtkAspectFramePrivate *priv;

   g_return_if_fail (GTK_IS_ASPECT_FRAME (aspect_frame));

   priv = aspect_frame->priv;

   xalign = CLAMP (xalign, 0.0, 1.0);
   yalign = CLAMP (yalign, 0.0, 1.0);
   ratio = CLAMP (ratio, MIN_RATIO, MAX_RATIO);
   obey_child = obey_child != FALSE;

   if (priv->xalign != xalign
       || priv->yalign != yalign
       || priv->ratio != ratio
       || priv->obey_child != obey_child)
     {
       g_object_freeze_notify (G_OBJECT (aspect_frame));

       if (priv->xalign != xalign)
         {
           priv->xalign = xalign;
           g_object_notify (G_OBJECT (aspect_frame), "xalign");
         }
       if (priv->yalign != yalign)
         {
           priv->yalign = yalign;
           g_object_notify (G_OBJECT (aspect_frame), "yalign");
         }
       if (priv->ratio != ratio)
         {
           priv->ratio = ratio;
           g_object_notify (G_OBJECT (aspect_frame), "ratio");
         }
       if (priv->obey_child != obey_child)
         {
           priv->obey_child = obey_child;
           g_object_notify (G_OBJECT (aspect_frame), "obey-child");
         }
       g_object_thaw_notify (G_OBJECT (aspect_frame));

       gtk_widget_queue_resize (GTK_WIDGET (aspect_frame));
     }
 }

 static void
 gtk_aspect_frame_compute_child_allocation (GtkFrame      *frame,
 					   GtkAllocation *child_allocation)
 {
   GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (frame);
   GtkAspectFramePrivate *priv = aspect_frame->priv;
   GtkBin *bin = GTK_BIN (frame);
   GtkWidget *child;
   gdouble ratio;

   child = gtk_bin_get_child (bin);
   if (child && gtk_widget_get_visible (child))
     {
       GtkAllocation full_allocation;

       if (priv->obey_child)
 	{
 	  GtkRequisition child_requisition;

           gtk_widget_get_preferred_size (child, &child_requisition, NULL);
 	  if (child_requisition.height != 0)
 	    {
 	      ratio = ((gdouble) child_requisition.width /
 		       child_requisition.height);
 	      if (ratio < MIN_RATIO)
 		ratio = MIN_RATIO;
 	    }
 	  else if (child_requisition.width != 0)
 	    ratio = MAX_RATIO;
 	  else
 	    ratio = 1.0;
 	}
       else
 	ratio = priv->ratio;

       GTK_FRAME_CLASS (gtk_aspect_frame_parent_class)->compute_child_allocation (frame, &full_allocation);

       if (ratio * full_allocation.height > full_allocation.width)
 	{
 	  child_allocation->width = full_allocation.width;
 	  child_allocation->height = full_allocation.width / ratio + 0.5;
 	}
       else
 	{
 	  child_allocation->width = ratio * full_allocation.height + 0.5;
 	  child_allocation->height = full_allocation.height;
 	}

       child_allocation->x = full_allocation.x + priv->xalign * (full_allocation.width - child_allocation->width);
       child_allocation->y = full_allocation.y + priv->yalign * (full_allocation.height - child_allocation->height);
     }
   else
     GTK_FRAME_CLASS (gtk_aspect_frame_parent_class)->compute_child_allocation (frame, child_allocation);
 }
	/* GTK - The GIMP Toolkit
	* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
	*
	* GtkAspectFrame: Ensure that the child window has a specified aspect ratio
	* or, if obey_child, has the same aspect ratio as its requested size
	*
	* Copyright Owen Taylor 4/9/97
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser 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
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library. If not, see <http://www.gnu.org/licenses/>.
	*/

	/*
	* Modified by the GTK+ Team and others 1997-2001. 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/.
	*/

	/**
	* SECTION:gtkaspectframe
	* @Short_description: A frame that constrains its child to a particular aspect ratio
	* @Title: GtkAspectFrame
	*
	* The #GtkAspectFrame is useful when you want
	* pack a widget so that it can resize but always retains
	* the same aspect ratio. For instance, one might be
	* drawing a small preview of a larger image. #GtkAspectFrame
	* derives from #GtkFrame, so it can draw a label and
	* a frame around the child. The frame will be
	* "shrink-wrapped" to the size of the child.
	*/

	#include "config.h"

	#include "gtkaspectframe.h"

	#include "gtksizerequest.h"

	#include "gtkprivate.h"
	#include "gtkintl.h"



	struct _GtkAspectFramePrivate
	{
	GtkAllocation center_allocation;

	gboolean obey_child;
	gfloat xalign;
	gfloat yalign;
	gfloat ratio;
	};


	enum {
	PROP_0,
	PROP_XALIGN,
	PROP_YALIGN,
	PROP_RATIO,
	PROP_OBEY_CHILD
	};

	static void gtk_aspect_frame_set_property (GObject *object,
	guint prop_id,
	const GValue *value,
	GParamSpec *pspec);
	static void gtk_aspect_frame_get_property (GObject *object,
	guint prop_id,
	GValue *value,
	GParamSpec *pspec);
	static void gtk_aspect_frame_compute_child_allocation (GtkFrame *frame,
	GtkAllocation *child_allocation);

	#define MAX_RATIO 10000.0
	#define MIN_RATIO 0.0001

	G_DEFINE_TYPE (GtkAspectFrame, gtk_aspect_frame, GTK_TYPE_FRAME)

	static void
	gtk_aspect_frame_class_init (GtkAspectFrameClass *class)
	{
	GObjectClass *gobject_class;
	GtkFrameClass *frame_class;

	gobject_class = (GObjectClass*) class;
	frame_class = (GtkFrameClass*) class;

	gobject_class->set_property = gtk_aspect_frame_set_property;
	gobject_class->get_property = gtk_aspect_frame_get_property;

	frame_class->compute_child_allocation = gtk_aspect_frame_compute_child_allocation;

	g_object_class_install_property (gobject_class,
	PROP_XALIGN,
	g_param_spec_float ("xalign",
	P_("Horizontal Alignment"),
	P_("X alignment of the child"),
	0.0, 1.0, 0.5,
	GTK_PARAM_READWRITE));
	g_object_class_install_property (gobject_class,
	PROP_YALIGN,
	g_param_spec_float ("yalign",
	P_("Vertical Alignment"),
	P_("Y alignment of the child"),
	0.0, 1.0, 0.5,
	GTK_PARAM_READWRITE));
	g_object_class_install_property (gobject_class,
	PROP_RATIO,
	g_param_spec_float ("ratio",
	P_("Ratio"),
	P_("Aspect ratio if obey_child is FALSE"),
	MIN_RATIO, MAX_RATIO, 1.0,
	GTK_PARAM_READWRITE));
	g_object_class_install_property (gobject_class,
	PROP_OBEY_CHILD,
	g_param_spec_boolean ("obey-child",
	P_("Obey child"),
	P_("Force aspect ratio to match that of the frame's child"),
	TRUE,
	GTK_PARAM_READWRITE));

	g_type_class_add_private (class, sizeof (GtkAspectFramePrivate));
	}

	static void
	gtk_aspect_frame_init (GtkAspectFrame *aspect_frame)
	{
	GtkAspectFramePrivate *priv;

	aspect_frame->priv = G_TYPE_INSTANCE_GET_PRIVATE (aspect_frame,
	GTK_TYPE_ASPECT_FRAME,
	GtkAspectFramePrivate);
	priv = aspect_frame->priv;

	priv->xalign = 0.5;
	priv->yalign = 0.5;
	priv->ratio = 1.0;
	priv->obey_child = TRUE;
	}

	static void
	gtk_aspect_frame_set_property (GObject *object,
	guint prop_id,
	const GValue *value,
	GParamSpec *pspec)
	{
	GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (object);
	GtkAspectFramePrivate *priv = aspect_frame->priv;

	switch (prop_id)
	{
	/* g_object_notify is handled by the _frame_set function */
	case PROP_XALIGN:
	gtk_aspect_frame_set (aspect_frame,
	g_value_get_float (value),
	priv->yalign,
	priv->ratio,
	priv->obey_child);
	break;
	case PROP_YALIGN:
	gtk_aspect_frame_set (aspect_frame,
	priv->xalign,
	g_value_get_float (value),
	priv->ratio,
	priv->obey_child);
	break;
	case PROP_RATIO:
	gtk_aspect_frame_set (aspect_frame,
	priv->xalign,
	priv->yalign,
	g_value_get_float (value),
	priv->obey_child);
	break;
	case PROP_OBEY_CHILD:
	gtk_aspect_frame_set (aspect_frame,
	priv->xalign,
	priv->yalign,
	priv->ratio,
	g_value_get_boolean (value));
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	static void
	gtk_aspect_frame_get_property (GObject *object,
	guint prop_id,
	GValue *value,
	GParamSpec *pspec)
	{
	GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (object);
	GtkAspectFramePrivate *priv = aspect_frame->priv;

	switch (prop_id)
	{
	case PROP_XALIGN:
	g_value_set_float (value, priv->xalign);
	break;
	case PROP_YALIGN:
	g_value_set_float (value, priv->yalign);
	break;
	case PROP_RATIO:
	g_value_set_float (value, priv->ratio);
	break;
	case PROP_OBEY_CHILD:
	g_value_set_boolean (value, priv->obey_child);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	/**
	* gtk_aspect_frame_new:
	* @label: Label text.
	* @xalign: Horizontal alignment of the child within the allocation of
	* the #GtkAspectFrame. This ranges from 0.0 (left aligned)
	* to 1.0 (right aligned)
	* @yalign: Vertical alignment of the child within the allocation of
	* the #GtkAspectFrame. This ranges from 0.0 (top aligned)
	* to 1.0 (bottom aligned)
	* @ratio: The desired aspect ratio.
	* @obey_child: If %TRUE, @ratio is ignored, and the aspect
	* ratio is taken from the requistion of the child.
	*
	* Create a new #GtkAspectFrame.
	*
	* Returns: the new #GtkAspectFrame.
	*/
	GtkWidget*
	gtk_aspect_frame_new (const gchar *label,
	gfloat xalign,
	gfloat yalign,
	gfloat ratio,
	gboolean obey_child)
	{
	GtkAspectFrame *aspect_frame;
	GtkAspectFramePrivate *priv;

	aspect_frame = g_object_new (GTK_TYPE_ASPECT_FRAME, NULL);

	priv = aspect_frame->priv;

	priv->xalign = CLAMP (xalign, 0.0, 1.0);
	priv->yalign = CLAMP (yalign, 0.0, 1.0);
	priv->ratio = CLAMP (ratio, MIN_RATIO, MAX_RATIO);
	priv->obey_child = obey_child != FALSE;

	gtk_frame_set_label (GTK_FRAME(aspect_frame), label);

	return GTK_WIDGET (aspect_frame);
	}

	/**
	* gtk_aspect_frame_set:
	* @aspect_frame: a #GtkAspectFrame
	* @xalign: Horizontal alignment of the child within the allocation of
	* the #GtkAspectFrame. This ranges from 0.0 (left aligned)
	* to 1.0 (right aligned)
	* @yalign: Vertical alignment of the child within the allocation of
	* the #GtkAspectFrame. This ranges from 0.0 (top aligned)
	* to 1.0 (bottom aligned)
	* @ratio: The desired aspect ratio.
	* @obey_child: If %TRUE, @ratio is ignored, and the aspect
	* ratio is taken from the requistion of the child.
	*
	* Set parameters for an existing #GtkAspectFrame.
	*/
	void
	gtk_aspect_frame_set (GtkAspectFrame *aspect_frame,
	gfloat xalign,
	gfloat yalign,
	gfloat ratio,
	gboolean obey_child)
	{
	GtkAspectFramePrivate *priv;

	g_return_if_fail (GTK_IS_ASPECT_FRAME (aspect_frame));

	priv = aspect_frame->priv;

	xalign = CLAMP (xalign, 0.0, 1.0);
	yalign = CLAMP (yalign, 0.0, 1.0);
	ratio = CLAMP (ratio, MIN_RATIO, MAX_RATIO);
	obey_child = obey_child != FALSE;

	if (priv->xalign != xalign
	\|\| priv->yalign != yalign
	\|\| priv->ratio != ratio
	\|\| priv->obey_child != obey_child)
	{
	g_object_freeze_notify (G_OBJECT (aspect_frame));

	if (priv->xalign != xalign)
	{
	priv->xalign = xalign;
	g_object_notify (G_OBJECT (aspect_frame), "xalign");
	}
	if (priv->yalign != yalign)
	{
	priv->yalign = yalign;
	g_object_notify (G_OBJECT (aspect_frame), "yalign");
	}
	if (priv->ratio != ratio)
	{
	priv->ratio = ratio;
	g_object_notify (G_OBJECT (aspect_frame), "ratio");
	}
	if (priv->obey_child != obey_child)
	{
	priv->obey_child = obey_child;
	g_object_notify (G_OBJECT (aspect_frame), "obey-child");
	}
	g_object_thaw_notify (G_OBJECT (aspect_frame));

	gtk_widget_queue_resize (GTK_WIDGET (aspect_frame));
	}
	}

	static void
	gtk_aspect_frame_compute_child_allocation (GtkFrame *frame,
	GtkAllocation *child_allocation)
	{
	GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (frame);
	GtkAspectFramePrivate *priv = aspect_frame->priv;
	GtkBin *bin = GTK_BIN (frame);
	GtkWidget *child;
	gdouble ratio;

	child = gtk_bin_get_child (bin);
	if (child && gtk_widget_get_visible (child))
	{
	GtkAllocation full_allocation;

	if (priv->obey_child)
	{
	GtkRequisition child_requisition;

	gtk_widget_get_preferred_size (child, &child_requisition, NULL);
	if (child_requisition.height != 0)
	{
	ratio = ((gdouble) child_requisition.width /
	child_requisition.height);
	if (ratio < MIN_RATIO)
	ratio = MIN_RATIO;
	}
	else if (child_requisition.width != 0)
	ratio = MAX_RATIO;
	else
	ratio = 1.0;
	}
	else
	ratio = priv->ratio;

	GTK_FRAME_CLASS (gtk_aspect_frame_parent_class)->compute_child_allocation (frame, &full_allocation);

	if (ratio * full_allocation.height > full_allocation.width)
	{
	child_allocation->width = full_allocation.width;
	child_allocation->height = full_allocation.width / ratio + 0.5;
	}
	else
	{
	child_allocation->width = ratio * full_allocation.height + 0.5;
	child_allocation->height = full_allocation.height;
	}

	child_allocation->x = full_allocation.x + priv->xalign * (full_allocation.width - child_allocation->width);
	child_allocation->y = full_allocation.y + priv->yalign * (full_allocation.height - child_allocation->height);
	}
	else
	GTK_FRAME_CLASS (gtk_aspect_frame_parent_class)->compute_child_allocation (frame, child_allocation);
	}