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-rw-r--r--calendar/gui/e-day-view-layout.c349
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diff --git a/calendar/gui/e-day-view-layout.c b/calendar/gui/e-day-view-layout.c
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--- a/calendar/gui/e-day-view-layout.c
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-/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
-
-/*
- * Author :
- * Damon Chaplin <damon@ximian.com>
- *
- * Copyright 2001, Ximian, Inc.
- *
- * 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
- */
-
-/*
- * Lays out events for the Day & Work-Week views of the calendar. It is also
- * used for printing.
- */
-
-#include <config.h>
-
-#include "e-day-view-layout.h"
-
-static void e_day_view_layout_long_event (EDayViewEvent *event,
- guint8 *grid,
- gint days_shown,
- time_t *day_starts,
- gint *rows_in_top_display);
-
-static void e_day_view_layout_day_event (EDayViewEvent *event,
- guint8 *grid,
- guint16 *group_starts,
- gint8 *cols_per_row,
- gint rows,
- gint mins_per_row);
-static void e_day_view_expand_day_event (EDayViewEvent *event,
- guint8 *grid,
- gint8 *cols_per_row,
- gint mins_per_row);
-static void e_day_view_recalc_cols_per_row (gint rows,
- gint8 *cols_per_row,
- guint16 *group_starts);
-
-
-void
-e_day_view_layout_long_events (GArray *events,
- gint days_shown,
- time_t *day_starts,
- gint *rows_in_top_display)
-{
- EDayViewEvent *event;
- gint event_num;
- guint8 *grid;
-
- /* This is a temporary 2-d grid which is used to place events.
- Each element is 0 if the position is empty, or 1 if occupied.
- We allocate the maximum size possible here, assuming that each
- event will need its own row. */
- grid = g_new0 (guint8, events->len * E_DAY_VIEW_MAX_DAYS);
-
- /* Reset the number of rows in the top display to 0. It will be
- updated as events are layed out below. */
- *rows_in_top_display = 0;
-
- /* Iterate over the events, finding which days they cover, and putting
- them in the first free row available. */
- for (event_num = 0; event_num < events->len; event_num++) {
- event = &g_array_index (events, EDayViewEvent, event_num);
- e_day_view_layout_long_event (event, grid,
- days_shown, day_starts,
- rows_in_top_display);
- }
-
- /* Free the grid. */
- g_free (grid);
-}
-
-
-static void
-e_day_view_layout_long_event (EDayViewEvent *event,
- guint8 *grid,
- gint days_shown,
- time_t *day_starts,
- gint *rows_in_top_display)
-{
- gint start_day, end_day, free_row, day, row;
-
- event->num_columns = 0;
-
- if (!e_day_view_find_long_event_days (event,
- days_shown, day_starts,
- &start_day, &end_day))
- return;
-
- /* Try each row until we find a free one. */
- row = 0;
- do {
- free_row = row;
- for (day = start_day; day <= end_day; day++) {
- if (grid[row * E_DAY_VIEW_MAX_DAYS + day]) {
- free_row = -1;
- break;
- }
- }
- row++;
- } while (free_row == -1);
-
- event->start_row_or_col = free_row;
- event->num_columns = 1;
-
- /* Mark the cells as full. */
- for (day = start_day; day <= end_day; day++) {
- grid[free_row * E_DAY_VIEW_MAX_DAYS + day] = 1;
- }
-
- /* Update the number of rows in the top canvas if necessary. */
- *rows_in_top_display = MAX (*rows_in_top_display, free_row + 1);
-}
-
-
-void
-e_day_view_layout_day_events (GArray *events,
- gint rows,
- gint mins_per_row,
- gint8 *cols_per_row)
-{
- EDayViewEvent *event;
- gint row, event_num;
- guint8 *grid;
-
- /* This is a temporary array which keeps track of rows which are
- connected. When an appointment spans multiple rows then the number
- of columns in each of these rows must be the same (i.e. the maximum
- of all of them). Each element in the array corresponds to one row
- and contains the index of the first row in the group of connected
- rows. */
- guint16 group_starts[12 * 24];
-
- /* Reset the cols_per_row array, and initialize the connected rows so
- that all rows are not connected - each row is the start of a new
- group. */
- for (row = 0; row < rows; row++) {
- cols_per_row[row] = 0;
- group_starts[row] = row;
- }
-
- /* This is a temporary 2-d grid which is used to place events.
- Each element is 0 if the position is empty, or 1 if occupied. */
- grid = g_new0 (guint8, rows * E_DAY_VIEW_MAX_COLUMNS);
-
-
- /* Iterate over the events, finding which rows they cover, and putting
- them in the first free column available. Increment the number of
- events in each of the rows it covers, and make sure they are all
- in one group. */
- for (event_num = 0; event_num < events->len; event_num++) {
- event = &g_array_index (events, EDayViewEvent, event_num);
-
- e_day_view_layout_day_event (event, grid, group_starts,
- cols_per_row, rows, mins_per_row);
- }
-
- /* Recalculate the number of columns needed in each row. */
- e_day_view_recalc_cols_per_row (rows, cols_per_row, group_starts);
-
- /* Iterate over the events again, trying to expand events horizontally
- if there is enough space. */
- for (event_num = 0; event_num < events->len; event_num++) {
- event = &g_array_index (events, EDayViewEvent, event_num);
- e_day_view_expand_day_event (event, grid, cols_per_row,
- mins_per_row);
- }
-
- /* Free the grid. */
- g_free (grid);
-}
-
-
-/* Finds the first free position to place the event in.
- Increments the number of events in each of the rows it covers, and makes
- sure they are all in one group. */
-static void
-e_day_view_layout_day_event (EDayViewEvent *event,
- guint8 *grid,
- guint16 *group_starts,
- gint8 *cols_per_row,
- gint rows,
- gint mins_per_row)
-{
- gint start_row, end_row, free_col, col, row, group_start;
-
- start_row = event->start_minute / mins_per_row;
- end_row = (event->end_minute - 1) / mins_per_row;
-
- event->num_columns = 0;
-
- /* If the event can't currently be seen, just return. */
- if (start_row >= rows || end_row < 0)
- return;
-
- /* Make sure we don't go outside the visible times. */
- start_row = CLAMP (start_row, 0, rows - 1);
- end_row = CLAMP (end_row, 0, rows - 1);
-
- /* Try each column until we find a free one. */
- for (col = 0; col < E_DAY_VIEW_MAX_COLUMNS; col++) {
- free_col = col;
- for (row = start_row; row <= end_row; row++) {
- if (grid[row * E_DAY_VIEW_MAX_COLUMNS + col]) {
- free_col = -1;
- break;
- }
- }
-
- if (free_col != -1)
- break;
- }
-
- /* If we can't find space for the event, just return. */
- if (free_col == -1)
- return;
-
- /* The event is assigned 1 col initially, but may be expanded later. */
- event->start_row_or_col = free_col;
- event->num_columns = 1;
-
- /* Determine the start index of the group. */
- group_start = group_starts[start_row];
-
- /* Increment number of events in each of the rows the event covers.
- We use the cols_per_row array for this. It will be sorted out after
- all the events have been layed out. Also make sure all the rows that
- the event covers are in one group. */
- for (row = start_row; row <= end_row; row++) {
- grid[row * E_DAY_VIEW_MAX_COLUMNS + free_col] = 1;
- cols_per_row[row]++;
- group_starts[row] = group_start;
- }
-
- /* If any following rows should be in the same group, add them. */
- for (row = end_row + 1; row < rows; row++) {
- if (group_starts[row] > end_row)
- break;
- group_starts[row] = group_start;
- }
-}
-
-
-/* For each group of rows, find the max number of events in all the
- rows, and set the number of cols in each of the rows to that. */
-static void
-e_day_view_recalc_cols_per_row (gint rows,
- gint8 *cols_per_row,
- guint16 *group_starts)
-{
- gint start_row = 0, row, next_start_row, max_events;
-
- while (start_row < rows) {
- max_events = 0;
- for (row = start_row; row < rows && group_starts[row] == start_row; row++)
- max_events = MAX (max_events, cols_per_row[row]);
-
- next_start_row = row;
-
- for (row = start_row; row < next_start_row; row++)
- cols_per_row[row] = max_events;
-
- start_row = next_start_row;
- }
-}
-
-
-/* Expands the event horizontally to fill any free space. */
-static void
-e_day_view_expand_day_event (EDayViewEvent *event,
- guint8 *grid,
- gint8 *cols_per_row,
- gint mins_per_row)
-{
- gint start_row, end_row, col, row;
- gboolean clashed;
-
- start_row = event->start_minute / mins_per_row;
- end_row = (event->end_minute - 1) / mins_per_row;
-
- /* Try each column until we find a free one. */
- clashed = FALSE;
- for (col = event->start_row_or_col + 1; col < cols_per_row[start_row]; col++) {
- for (row = start_row; row <= end_row; row++) {
- if (grid[row * E_DAY_VIEW_MAX_COLUMNS + col]) {
- clashed = TRUE;
- break;
- }
- }
-
- if (clashed)
- break;
-
- event->num_columns++;
- }
-}
-
-
-/* Find the start and end days for the event. */
-gboolean
-e_day_view_find_long_event_days (EDayViewEvent *event,
- gint days_shown,
- time_t *day_starts,
- gint *start_day_return,
- gint *end_day_return)
-{
- gint day, start_day, end_day;
-
- start_day = -1;
- end_day = -1;
-
- for (day = 0; day < days_shown; day++) {
- if (start_day == -1
- && event->start < day_starts[day + 1])
- start_day = day;
- if (event->end > day_starts[day])
- end_day = day;
- }
-
- /* Sanity check. */
- if (start_day < 0 || start_day >= days_shown
- || end_day < 0 || end_day >= days_shown
- || end_day < start_day) {
- g_warning ("Invalid date range for event");
- return FALSE;
- }
-
- *start_day_return = start_day;
- *end_day_return = end_day;
-
- return TRUE;
-}
-
-
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