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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* caja-keep-last-vertical-box.c: Subclass of GtkBox that clips off
items that don't fit, except the last one.
Copyright (C) 2000 Eazel, Inc.
The Mate 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.
The Mate 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 the Mate Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
Boston, MA 02110-1301, USA.
Author: John Sullivan <sullivan@eazel.com>,
*/
#include <config.h>
#include "caja-keep-last-vertical-box.h"
static void caja_keep_last_vertical_box_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
G_DEFINE_TYPE (CajaKeepLastVerticalBox, caja_keep_last_vertical_box, GTK_TYPE_BOX)
/* Standard class initialization function */
static void
caja_keep_last_vertical_box_class_init (CajaKeepLastVerticalBoxClass *klass)
{
GtkWidgetClass *widget_class;
widget_class = (GtkWidgetClass *) klass;
widget_class->size_allocate = caja_keep_last_vertical_box_size_allocate;
}
/* Standard object initialization function */
static void
caja_keep_last_vertical_box_init (CajaKeepLastVerticalBox *box)
{
gtk_orientable_set_orientation (GTK_ORIENTABLE (box), GTK_ORIENTATION_VERTICAL);
}
/* caja_keep_last_vertical_box_new:
*
* Create a new vertical box that clips off items from the end that don't
* fit, except the last item, which is always kept. When packing this widget
* into another vbox, use TRUE for expand and TRUE for fill or this class's
* special clipping magic won't work because this widget's allocation might
* be larger than the available space.
*
* @spacing: Vertical space between items.
*
* Return value: A new CajaKeepLastVerticalBox
*/
GtkWidget *
caja_keep_last_vertical_box_new (gint spacing)
{
CajaKeepLastVerticalBox *box;
box = CAJA_KEEP_LAST_VERTICAL_BOX (gtk_widget_new (caja_keep_last_vertical_box_get_type (), NULL));
gtk_box_set_spacing (GTK_BOX (box), spacing);
/* If homogeneous is TRUE and there are too many items to fit
* naturally, they will be squashed together to fit in the space.
* We want the ones that don't fit to be not shown at all, so
* we set homogeneous to FALSE.
*/
gtk_box_set_homogeneous (GTK_BOX (box), FALSE);
return GTK_WIDGET (box);
}
static void
caja_keep_last_vertical_box_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GList *children, *l;
GtkAllocation last_child_allocation, child_allocation, tiny_allocation;
g_return_if_fail (CAJA_IS_KEEP_LAST_VERTICAL_BOX (widget));
g_return_if_fail (allocation != NULL);
GTK_WIDGET_CLASS (caja_keep_last_vertical_box_parent_class)->size_allocate (widget, allocation);
children = gtk_container_get_children (GTK_CONTAINER (widget));
l = g_list_last (children);
if (l != NULL)
{
GtkWidget *last_child;
last_child = l->data;
l = l->prev;
gtk_widget_get_allocation (last_child, &last_child_allocation);
/* If last child doesn't fit vertically, prune items from the end of the
* list one at a time until it does.
*/
if (last_child_allocation.y + last_child_allocation.height >
allocation->y + allocation->height)
{
GtkWidget *child = NULL;
while (l != NULL)
{
child = l->data;
l = l->prev;
gtk_widget_get_allocation (child, &child_allocation);
/* Reallocate this child's position so that it does not appear.
* Setting the width & height to 0 is not enough, as
* one pixel is still drawn. Must also move it outside
* visible range. For the cases I've seen, -1, -1 works fine.
* This might not work in all future cases. Alternatively, the
* items that don't fit could be hidden, but that would interfere
* with having other hidden children.
*
* Note that these children are having their size allocated twice,
* once by gtk_vbox_size_allocate and then again here. I don't
* know of any problems with this, but holler if you do.
*/
tiny_allocation.x = tiny_allocation.y = -1;
tiny_allocation.height = tiny_allocation.width = 0;
gtk_widget_size_allocate (child, &tiny_allocation);
/* We're done if the special last item fits now. */
if (child_allocation.y + last_child_allocation.height <=
allocation->y + allocation->height)
{
last_child_allocation.y = child_allocation.y;
gtk_widget_size_allocate (last_child, &last_child_allocation);
break;
}
/* If the special last item still doesn't fit, but we've
* run out of earlier items, then the special last item is
* just too darn tall. Let's squash it down to fit in the box's
* allocation.
*/
if (l == NULL)
{
last_child_allocation.y = allocation->y;
last_child_allocation.height = allocation->height;
gtk_widget_size_allocate (last_child, &last_child_allocation);
}
}
}
}
g_list_free (children);
}
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