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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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "gtkalignment.h"
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);
guint
gtk_alignment_get_type ()
{
static guint alignment_type = 0;
if (!alignment_type)
{
GtkTypeInfo alignment_info =
{
"GtkAlignment",
sizeof (GtkAlignment),
sizeof (GtkAlignmentClass),
(GtkClassInitFunc) gtk_alignment_class_init,
(GtkObjectInitFunc) gtk_alignment_init,
(GtkArgSetFunc) NULL,
(GtkArgGetFunc) NULL,
};
alignment_type = gtk_type_unique (gtk_bin_get_type (), &alignment_info);
}
return alignment_type;
}
static void
gtk_alignment_class_init (GtkAlignmentClass *class)
{
GtkWidgetClass *widget_class;
widget_class = (GtkWidgetClass*) class;
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 | GTK_BASIC);
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);
}
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))
{
gtk_widget_size_request (bin->child, &bin->child->requisition);
requisition->width += bin->child->requisition.width;
requisition->height += bin->child->requisition.height;
}
}
static void
gtk_alignment_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkAlignment *alignment;
GtkBin *bin;
GtkAllocation child_allocation;
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))
{
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 > bin->child->requisition.width)
child_allocation.width = (bin->child->requisition.width *
(1.0 - alignment->xscale) +
width * alignment->xscale);
else
child_allocation.width = width;
if (height > bin->child->requisition.height)
child_allocation.height = (bin->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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