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/* Evolution calendar - Event layout engine
*
* Copyright (C) 2000 Helix Code, Inc.
*
* Authors: Miguel de Icaza <miguel@helixcode.com>
* Federico Mena-Quintero <federico@helixcode.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef LAYOUT_H
#define LAYOUT_H
#include <glib.h>
#include <time.h>
/* Functions of this type must translate the list item into two time_t values
* for the start and end of an event.
*/
typedef void (* LayoutQueryTimeFunc) (GList *event, time_t *start, time_t *end);
/* This is the main layout function for overlapping events. You pass in a list
* of (presumably) events and a function that should take a list element and
* return the start and end times for the event corresponding to that list
* element.
*
* It returns the number of slots ("columns") that you need to take into account
* when actually painting the events, the array of the first slot index that
* each event occupies, and the array of number of slots that each event
* occupies. You have to free both arrays.
*
* You will get somewhat better-looking results if the list of events is sorted
* by using the start time as the primary sort key and the end time as the
* secondary sort key -- so that "longer" events go first in the list.
*/
void layout_events (GList *events, LayoutQueryTimeFunc func,
int *num_slots, int **allocations, int **slots);
#endif
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