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gtk2/gtk/gtkaspectframe.c
Tim Janik afee2c67c5 applied patch from Andreas Persenius <ndap@swipnet.se> that updates the 
Wed Jul 26 12:59:31 2000  Tim Janik  <timj@gtk.org>

        * *.[hc]: applied patch from Andreas Persenius <ndap@swipnet.se> that
        updates the license headers to the GNU Lesser General Public License,
        as well as updating the copyright year to 2000.
2000-07-26 11:33:08 +00:00

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/* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. 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 "gtkaspectframe.h"
enum {
ARG_0,
ARG_XALIGN,
ARG_YALIGN,
ARG_RATIO,
ARG_OBEY_CHILD
};
static void gtk_aspect_frame_class_init (GtkAspectFrameClass *klass);
static void gtk_aspect_frame_init (GtkAspectFrame *aspect_frame);
static void gtk_aspect_frame_set_arg (GtkObject *object,
GtkArg *arg,
guint arg_id);
static void gtk_aspect_frame_get_arg (GtkObject *object,
GtkArg *arg,
guint arg_id);
static void gtk_aspect_frame_compute_child_allocation (GtkFrame *frame,
GtkAllocation *child_allocation);
#define MAX_RATIO 10000.0
#define MIN_RATIO 0.0001
static GtkFrameClass *parent_class = NULL;
GtkType
gtk_aspect_frame_get_type (void)
{
static GtkType aspect_frame_type = 0;
if (!aspect_frame_type)
{
static const GtkTypeInfo aspect_frame_info =
{
"GtkAspectFrame",
sizeof (GtkAspectFrame),
sizeof (GtkAspectFrameClass),
(GtkClassInitFunc) gtk_aspect_frame_class_init,
(GtkObjectInitFunc) gtk_aspect_frame_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
aspect_frame_type = gtk_type_unique (GTK_TYPE_FRAME, &aspect_frame_info);
}
return aspect_frame_type;
}
static void
gtk_aspect_frame_class_init (GtkAspectFrameClass *class)
{
GtkObjectClass *object_class;
GtkFrameClass *frame_class;
parent_class = gtk_type_class (GTK_TYPE_FRAME);
object_class = GTK_OBJECT_CLASS (class);
frame_class = GTK_FRAME_CLASS (class);
object_class->set_arg = gtk_aspect_frame_set_arg;
object_class->get_arg = gtk_aspect_frame_get_arg;
frame_class->compute_child_allocation = gtk_aspect_frame_compute_child_allocation;
gtk_object_add_arg_type ("GtkAspectFrame::xalign", GTK_TYPE_FLOAT,
GTK_ARG_READWRITE, ARG_XALIGN);
gtk_object_add_arg_type ("GtkAspectFrame::yalign", GTK_TYPE_FLOAT,
GTK_ARG_READWRITE, ARG_YALIGN);
gtk_object_add_arg_type ("GtkAspectFrame::ratio", GTK_TYPE_FLOAT,
GTK_ARG_READWRITE, ARG_RATIO);
gtk_object_add_arg_type ("GtkAspectFrame::obey_child", GTK_TYPE_BOOL,
GTK_ARG_READWRITE, ARG_OBEY_CHILD);
}
static void
gtk_aspect_frame_init (GtkAspectFrame *aspect_frame)
{
aspect_frame->xalign = 0.5;
aspect_frame->yalign = 0.5;
aspect_frame->ratio = 1.0;
aspect_frame->obey_child = TRUE;
}
static void
gtk_aspect_frame_set_arg (GtkObject *object,
GtkArg *arg,
guint arg_id)
{
GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (object);
switch (arg_id)
{
case ARG_XALIGN:
gtk_aspect_frame_set (aspect_frame,
GTK_VALUE_FLOAT (*arg),
aspect_frame->yalign,
aspect_frame->ratio,
aspect_frame->obey_child);
break;
case ARG_YALIGN:
gtk_aspect_frame_set (aspect_frame,
aspect_frame->xalign,
GTK_VALUE_FLOAT (*arg),
aspect_frame->ratio,
aspect_frame->obey_child);
break;
case ARG_RATIO:
gtk_aspect_frame_set (aspect_frame,
aspect_frame->xalign,
aspect_frame->yalign,
GTK_VALUE_FLOAT (*arg),
aspect_frame->obey_child);
break;
case ARG_OBEY_CHILD:
gtk_aspect_frame_set (aspect_frame,
aspect_frame->xalign,
aspect_frame->yalign,
aspect_frame->ratio,
GTK_VALUE_BOOL (*arg));
break;
}
}
static void
gtk_aspect_frame_get_arg (GtkObject *object,
GtkArg *arg,
guint arg_id)
{
GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (object);
switch (arg_id)
{
case ARG_XALIGN:
GTK_VALUE_FLOAT (*arg) = aspect_frame->xalign;
break;
case ARG_YALIGN:
GTK_VALUE_FLOAT (*arg) = aspect_frame->yalign;
break;
case ARG_RATIO:
GTK_VALUE_FLOAT (*arg) = aspect_frame->ratio;
break;
case ARG_OBEY_CHILD:
GTK_VALUE_BOOL (*arg) = aspect_frame->obey_child;
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
GtkWidget*
gtk_aspect_frame_new (const gchar *label,
gfloat xalign,
gfloat yalign,
gfloat ratio,
gboolean obey_child)
{
GtkAspectFrame *aspect_frame;
aspect_frame = gtk_type_new (gtk_aspect_frame_get_type ());
aspect_frame->xalign = CLAMP (xalign, 0.0, 1.0);
aspect_frame->yalign = CLAMP (yalign, 0.0, 1.0);
aspect_frame->ratio = CLAMP (ratio, MIN_RATIO, MAX_RATIO);
aspect_frame->obey_child = obey_child != FALSE;
gtk_frame_set_label (GTK_FRAME(aspect_frame), label);
return GTK_WIDGET (aspect_frame);
}
void
gtk_aspect_frame_set (GtkAspectFrame *aspect_frame,
gfloat xalign,
gfloat yalign,
gfloat ratio,
gboolean obey_child)
{
g_return_if_fail (aspect_frame != NULL);
g_return_if_fail (GTK_IS_ASPECT_FRAME (aspect_frame));
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 ((aspect_frame->xalign != xalign) ||
(aspect_frame->yalign != yalign) ||
(aspect_frame->ratio != ratio) ||
(aspect_frame->obey_child != obey_child))
{
GtkWidget *widget = GTK_WIDGET(aspect_frame);
aspect_frame->xalign = xalign;
aspect_frame->yalign = yalign;
aspect_frame->ratio = ratio;
aspect_frame->obey_child = obey_child;
gtk_widget_queue_resize (widget);
}
}
static void
gtk_aspect_frame_compute_child_allocation (GtkFrame *frame,
GtkAllocation *child_allocation)
{
GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (frame);
GtkBin *bin = GTK_BIN (frame);
gdouble ratio;
if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
{
GtkAllocation full_allocation;
if (aspect_frame->obey_child)
{
GtkRequisition child_requisition;
gtk_widget_get_child_requisition (bin->child, &child_requisition);
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 = aspect_frame->ratio;
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 + aspect_frame->xalign * (full_allocation.width - child_allocation->width);
child_allocation->y = full_allocation.y + aspect_frame->yalign * (full_allocation.height - child_allocation->height);
}
else
parent_class->compute_child_allocation (frame, child_allocation);
}
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