1 files changed, 56 insertions, 0 deletions
diff --git a/calendar/gui/layout.h b/calendar/gui/layout.h
new file mode 100644
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+++ b/calendar/gui/layout.h
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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