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nautilus-keep-last-vertical-box.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */

/* nautilus-keep-last-vertical-box.c: Subclass of GtkVBox that clips off
                              items that don't fit, except the last one.

   Copyright (C) 2000 Eazel, Inc.

   The Gnome 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 Gnome 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 Gnome Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.

   Author: John Sullivan <sullivan@eazel.com>,
 */

#include <config.h>
#include "nautilus-keep-last-vertical-box.h"

#include <eel/eel-gtk-macros.h>

static void     nautilus_keep_last_vertical_box_class_init  (NautilusKeepLastVerticalBoxClass *class);
static void     nautilus_keep_last_vertical_box_init        (NautilusKeepLastVerticalBox      *box);
static void nautilus_keep_last_vertical_box_size_allocate     (GtkWidget                      *widget, 
                                                   GtkAllocation            *allocation);

EEL_CLASS_BOILERPLATE (NautilusKeepLastVerticalBox, nautilus_keep_last_vertical_box, GTK_TYPE_VBOX)

/* Standard class initialization function */
static void
nautilus_keep_last_vertical_box_class_init (NautilusKeepLastVerticalBoxClass *klass)
{
      GtkWidgetClass *widget_class;

      widget_class = (GtkWidgetClass *) klass;

      widget_class->size_allocate = nautilus_keep_last_vertical_box_size_allocate;
}

/* Standard object initialization function */
static void
nautilus_keep_last_vertical_box_init (NautilusKeepLastVerticalBox *box)
{
}


/* nautilus_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 NautilusKeepLastVerticalBox
 */
GtkWidget *
nautilus_keep_last_vertical_box_new (gint spacing)
{
      NautilusKeepLastVerticalBox *box;

      box = NAUTILUS_KEEP_LAST_VERTICAL_BOX (gtk_widget_new (nautilus_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
nautilus_keep_last_vertical_box_size_allocate (GtkWidget *widget,
                                     GtkAllocation *allocation)
{
      GtkBox *box;
      GtkWidget *last_child, *child;
      GList *children, *l;
      GtkAllocation last_child_allocation, child_allocation, tiny_allocation;

      g_return_if_fail (NAUTILUS_IS_KEEP_LAST_VERTICAL_BOX (widget));
      g_return_if_fail (allocation != NULL);

      EEL_CALL_PARENT (GTK_WIDGET_CLASS, size_allocate, (widget, allocation));

      box = GTK_BOX (widget);
      children = gtk_container_get_children (GTK_CONTAINER(widget));
      l = g_list_last (children);

      if (l != NULL) {
            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) {

                  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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