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gtk2/gtk/gtkalignment.c
CST 1999 Shawn T. Amundson 279e878bdd Added notice to look in AUTHORS and ChangeLog files for a list of changes. 
Wed Feb 24 01:22:39 CST 1999 Shawn T. Amundson <amundson@gtk.org>

        * *.[ch]: Added notice to look in AUTHORS and ChangeLog files
	  for a list of changes.
1999-02-24 07:37:18 +00:00

309 lines
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/* 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 "gtkalignment.h"
enum {
ARG_0,
ARG_XALIGN,
ARG_YALIGN,
ARG_XSCALE,
ARG_YSCALE
};
static void gtk_alignment_class_init (GtkAlignmentClass *klass);
static void gtk_alignment_init (GtkAlignment *alignment);
static void gtk_alignment_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void gtk_alignment_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void gtk_alignment_set_arg (GtkObject *object,
GtkArg *arg,
guint arg_id);
static void gtk_alignment_get_arg (GtkObject *object,
GtkArg *arg,
guint arg_id);
GtkType
gtk_alignment_get_type (void)
{
static GtkType alignment_type = 0;
if (!alignment_type)
{
static const GtkTypeInfo alignment_info =
{
"GtkAlignment",
sizeof (GtkAlignment),
sizeof (GtkAlignmentClass),
(GtkClassInitFunc) gtk_alignment_class_init,
(GtkObjectInitFunc) gtk_alignment_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL,
};
alignment_type = gtk_type_unique (GTK_TYPE_BIN, &alignment_info);
}
return alignment_type;
}
static void
gtk_alignment_class_init (GtkAlignmentClass *class)
{
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
object_class = (GtkObjectClass*) class;
widget_class = (GtkWidgetClass*) class;
gtk_object_add_arg_type ("GtkAlignment::xalign", GTK_TYPE_FLOAT, GTK_ARG_READWRITE, ARG_XALIGN);
gtk_object_add_arg_type ("GtkAlignment::yalign", GTK_TYPE_FLOAT, GTK_ARG_READWRITE, ARG_YALIGN);
gtk_object_add_arg_type ("GtkAlignment::xscale", GTK_TYPE_FLOAT, GTK_ARG_READWRITE, ARG_XSCALE);
gtk_object_add_arg_type ("GtkAlignment::yscale", GTK_TYPE_FLOAT, GTK_ARG_READWRITE, ARG_YSCALE);
object_class->set_arg = gtk_alignment_set_arg;
object_class->get_arg = gtk_alignment_get_arg;
widget_class->size_request = gtk_alignment_size_request;
widget_class->size_allocate = gtk_alignment_size_allocate;
}
static void
gtk_alignment_init (GtkAlignment *alignment)
{
GTK_WIDGET_SET_FLAGS (alignment, GTK_NO_WINDOW);
alignment->xalign = 0.5;
alignment->yalign = 0.5;
alignment->xscale = 1.0;
alignment->yscale = 1.0;
}
GtkWidget*
gtk_alignment_new (gfloat xalign,
gfloat yalign,
gfloat xscale,
gfloat yscale)
{
GtkAlignment *alignment;
alignment = gtk_type_new (gtk_alignment_get_type ());
alignment->xalign = CLAMP (xalign, 0.0, 1.0);
alignment->yalign = CLAMP (yalign, 0.0, 1.0);
alignment->xscale = CLAMP (xscale, 0.0, 1.0);
alignment->yscale = CLAMP (yscale, 0.0, 1.0);
return GTK_WIDGET (alignment);
}
static void
gtk_alignment_set_arg (GtkObject *object,
GtkArg *arg,
guint arg_id)
{
GtkAlignment *alignment;
alignment = GTK_ALIGNMENT (object);
switch (arg_id)
{
case ARG_XALIGN:
gtk_alignment_set (alignment,
GTK_VALUE_FLOAT (*arg),
alignment->yalign,
alignment->xscale,
alignment->yscale);
break;
case ARG_YALIGN:
gtk_alignment_set (alignment,
alignment->xalign,
GTK_VALUE_FLOAT (*arg),
alignment->xscale,
alignment->yscale);
break;
case ARG_XSCALE:
gtk_alignment_set (alignment,
alignment->xalign,
alignment->yalign,
GTK_VALUE_FLOAT (*arg),
alignment->yscale);
break;
case ARG_YSCALE:
gtk_alignment_set (alignment,
alignment->xalign,
alignment->yalign,
alignment->xscale,
GTK_VALUE_FLOAT (*arg));
break;
default:
break;
}
}
static void
gtk_alignment_get_arg (GtkObject *object,
GtkArg *arg,
guint arg_id)
{
GtkAlignment *alignment;
alignment = GTK_ALIGNMENT (object);
switch (arg_id)
{
case ARG_XALIGN:
GTK_VALUE_FLOAT (*arg) = alignment->xalign;
break;
case ARG_YALIGN:
GTK_VALUE_FLOAT (*arg) = alignment->yalign;
break;
case ARG_XSCALE:
GTK_VALUE_FLOAT (*arg) = alignment->xscale;
break;
case ARG_YSCALE:
GTK_VALUE_FLOAT (*arg) = alignment->yscale;
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
void
gtk_alignment_set (GtkAlignment *alignment,
gfloat xalign,
gfloat yalign,
gfloat xscale,
gfloat yscale)
{
g_return_if_fail (alignment != NULL);
g_return_if_fail (GTK_IS_ALIGNMENT (alignment));
xalign = CLAMP (xalign, 0.0, 1.0);
yalign = CLAMP (yalign, 0.0, 1.0);
xscale = CLAMP (xscale, 0.0, 1.0);
yscale = CLAMP (yscale, 0.0, 1.0);
if ((alignment->xalign != xalign) ||
(alignment->yalign != yalign) ||
(alignment->xscale != xscale) ||
(alignment->yscale != yscale))
{
alignment->xalign = xalign;
alignment->yalign = yalign;
alignment->xscale = xscale;
alignment->yscale = yscale;
gtk_widget_size_allocate (GTK_WIDGET (alignment), &(GTK_WIDGET (alignment)->allocation));
gtk_widget_queue_draw (GTK_WIDGET (alignment));
}
}
static void
gtk_alignment_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GtkAlignment *alignment;
GtkBin *bin;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_ALIGNMENT (widget));
g_return_if_fail (requisition != NULL);
alignment = GTK_ALIGNMENT (widget);
bin = GTK_BIN (widget);
requisition->width = GTK_CONTAINER (widget)->border_width * 2;
requisition->height = GTK_CONTAINER (widget)->border_width * 2;
if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
{
GtkRequisition child_requisition;
gtk_widget_size_request (bin->child, &child_requisition);
requisition->width += child_requisition.width;
requisition->height += child_requisition.height;
}
}
static void
gtk_alignment_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkAlignment *alignment;
GtkBin *bin;
GtkAllocation child_allocation;
GtkRequisition child_requisition;
gint width, height;
gint x, y;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_ALIGNMENT (widget));
g_return_if_fail (allocation != NULL);
widget->allocation = *allocation;
alignment = GTK_ALIGNMENT (widget);
bin = GTK_BIN (widget);
if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
{
gtk_widget_get_child_requisition (bin->child, &child_requisition);
x = GTK_CONTAINER (alignment)->border_width;
y = GTK_CONTAINER (alignment)->border_width;
width = MAX (allocation->width - 2 * x, 0);
height = MAX (allocation->height - 2 * y, 0);
if (width > child_requisition.width)
child_allocation.width = (child_requisition.width *
(1.0 - alignment->xscale) +
width * alignment->xscale);
else
child_allocation.width = width;
if (height > child_requisition.height)
child_allocation.height = (child_requisition.height *
(1.0 - alignment->yscale) +
height * alignment->yscale);
else
child_allocation.height = height;
child_allocation.x = alignment->xalign * (width - child_allocation.width) + allocation->x + x;
child_allocation.y = alignment->yalign * (height - child_allocation.height) + allocation->y + y;
gtk_widget_size_allocate (bin->child, &child_allocation);
}
}
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