path: root/calendar/gui/e-week-view.c

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

/*
 * Authors :
 *  Damon Chaplin <damon@ximian.com>
 *  Rodrigo Moya <rodrigo@ximian.com>
 *
 * Copyright 1999, Helix Code, Inc.
 * 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
 */

/*
 * EWeekView - displays the Week & Month views of the calendar.
 */

#include <config.h>

#include "e-week-view.h"

#include <math.h>
#include <gdk/gdkkeysyms.h>
#include <gtk/gtkinvisible.h>
#include <gtk/gtkselection.h>
#include <gtk/gtksignal.h>
#include <gtk/gtkvscrollbar.h>
#include <gtk/gtkwindow.h>
#include <libgnome/gnome-defs.h>
#include <libgnome/gnome-i18n.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gdk-pixbuf/gnome-canvas-pixbuf.h>
#include <gal/e-text/e-text.h>
#include <gal/widgets/e-popup-menu.h>
#include <gal/widgets/e-canvas-utils.h>
#include "dialogs/delete-comp.h"
#include "comp-util.h"
#include "cal-util/timeutil.h"
#include "calendar-commands.h"
#include "goto.h"
#include "e-meeting-edit.h"
#include "e-week-view-event-item.h"
#include "e-week-view-layout.h"
#include "e-week-view-main-item.h"
#include "e-week-view-titles-item.h"

/* Images */
#include "art/bell.xpm"
#include "art/recur.xpm"
#include "art/jump.xpm"

#define E_WEEK_VIEW_SMALL_FONT  \
    "-adobe-utopia-regular-r-normal-*-*-100-*-*-p-*-iso8859-*"
#define E_WEEK_VIEW_SMALL_FONT_FALLBACK \
    "-adobe-helvetica-medium-r-normal-*-*-80-*-*-p-*-iso8859-*"

#define E_WEEK_VIEW_JUMP_BUTTON_WIDTH   16
#define E_WEEK_VIEW_JUMP_BUTTON_HEIGHT  8

#define E_WEEK_VIEW_JUMP_BUTTON_X_PAD   3
#define E_WEEK_VIEW_JUMP_BUTTON_Y_PAD   3

static void e_week_view_class_init (EWeekViewClass *class);
static void e_week_view_init (EWeekView *week_view);
static void e_week_view_destroy (GtkObject *object);
static void e_week_view_realize (GtkWidget *widget);
static void e_week_view_unrealize (GtkWidget *widget);
static void e_week_view_style_set (GtkWidget *widget,
                   GtkStyle  *previous_style);
static void e_week_view_size_allocate (GtkWidget *widget,
                       GtkAllocation *allocation);
static void e_week_view_recalc_cell_sizes (EWeekView *week_view);
static gint e_week_view_focus_in (GtkWidget *widget,
                  GdkEventFocus *event);
static gint e_week_view_focus_out (GtkWidget *widget,
                   GdkEventFocus *event);
static gint e_week_view_expose_event (GtkWidget *widget,
                      GdkEventExpose *event);
static void e_week_view_draw (GtkWidget    *widget,
                  GdkRectangle *area);
static void e_week_view_draw_shadow (EWeekView *week_view);

static gboolean e_week_view_on_button_press (GtkWidget *widget,
                         GdkEventButton *event,
                         EWeekView *week_view);
static gboolean e_week_view_on_button_release (GtkWidget *widget,
                           GdkEventButton *event,
                           EWeekView *week_view);
static gboolean e_week_view_on_motion (GtkWidget *widget,
                       GdkEventMotion *event,
                       EWeekView *week_view);
static gint e_week_view_convert_position_to_day (EWeekView *week_view,
                         gint x,
                         gint y);
static void e_week_view_update_selection (EWeekView *week_view,
                      gint day);

static void e_week_view_free_events (EWeekView *week_view);
static gboolean e_week_view_add_event (CalComponent *comp,
                       time_t     start,
                       time_t     end,
                       gpointer   data);
static void e_week_view_check_layout (EWeekView *week_view);
static void e_week_view_ensure_events_sorted (EWeekView *week_view);
static void e_week_view_reshape_events (EWeekView *week_view);
static void e_week_view_reshape_event_span (EWeekView *week_view,
                        gint event_num,
                        gint span_num);
static void e_week_view_recalc_day_starts (EWeekView *week_view,
                       time_t lower);
static void e_week_view_on_adjustment_changed (GtkAdjustment *adjustment,
                           EWeekView *week_view);
static void e_week_view_on_editing_started (EWeekView *week_view,
                        GnomeCanvasItem *item);
static void e_week_view_on_editing_stopped (EWeekView *week_view,
                        GnomeCanvasItem *item);
static gboolean e_week_view_find_event_from_item (EWeekView   *week_view,
                          GnomeCanvasItem *item,
                          gint        *event_num,
                          gint        *span_num);
static gboolean e_week_view_find_event_from_uid (EWeekView    *week_view,
                         const gchar      *uid,
                         gint         *event_num_return);
typedef gboolean (* EWeekViewForeachEventCallback) (EWeekView *week_view,
                            gint event_num,
                            gpointer data);

static void e_week_view_foreach_event_with_uid (EWeekView *week_view,
                        const gchar *uid,
                        EWeekViewForeachEventCallback callback,
                        gpointer data);
static gboolean e_week_view_on_text_item_event (GnomeCanvasItem *item,
                        GdkEvent *event,
                        EWeekView *week_view);
static gboolean e_week_view_on_jump_button_event (GnomeCanvasItem *item,
                          GdkEvent *event,
                          EWeekView *week_view);
static gint e_week_view_key_press (GtkWidget *widget, GdkEventKey *event);
static void e_week_view_on_new_appointment (GtkWidget *widget,
                        gpointer data);
static void e_week_view_on_new_event       (GtkWidget *widget,
                       gpointer data);
static void e_week_view_on_goto_today      (GtkWidget *widget,
                       gpointer data);
static void e_week_view_on_goto_date       (GtkWidget *widget,
                       gpointer data);
static void e_week_view_on_edit_appointment (GtkWidget *widget,
                         gpointer data);
static void e_week_view_on_delete_occurrence (GtkWidget *widget,
                          gpointer data);
static void e_week_view_on_delete_appointment (GtkWidget *widget,
                           gpointer data);
static void e_week_view_on_cut (GtkWidget *widget, gpointer data);
static void e_week_view_on_copy (GtkWidget *widget, gpointer data);
static void e_week_view_on_paste (GtkWidget *widget, gpointer data);
static void e_week_view_on_schedule_meet (GtkWidget *widget, 
                      gpointer data);
static void e_week_view_on_unrecur_appointment (GtkWidget *widget,
                        gpointer data);

static gboolean e_week_view_update_event_cb (EWeekView *week_view,
                         gint event_num,
                         gpointer data);
static gboolean e_week_view_remove_event_cb (EWeekView *week_view,
                         gint event_num,
                         gpointer data);
static gboolean e_week_view_recalc_display_start_day    (EWeekView  *week_view);

static void invisible_destroyed   (GtkWidget *invisible, EWeekView *week_view);
static void selection_get         (GtkWidget *invisible,
                   GtkSelectionData *selection_data,
                   guint info,
                   guint time_stamp,
                   EWeekView *week_view);
static void selection_clear_event (GtkWidget *invisible,
                   GdkEventSelection *event,
                   EWeekView *week_view);
static void selection_received    (GtkWidget *invisible,
                   GtkSelectionData *selection_data,
                   guint time,
                   EWeekView *week_view);

static GtkTableClass *parent_class;
static GdkAtom clipboard_atom = GDK_NONE;


GtkType
e_week_view_get_type (void)
{
    static GtkType e_week_view_type = 0;

    if (!e_week_view_type){
        GtkTypeInfo e_week_view_info = {
            "EWeekView",
            sizeof (EWeekView),
            sizeof (EWeekViewClass),
            (GtkClassInitFunc) e_week_view_class_init,
            (GtkObjectInitFunc) e_week_view_init,
            NULL, /* reserved 1 */
            NULL, /* reserved 2 */
            (GtkClassInitFunc) NULL
        };

        parent_class = gtk_type_class (GTK_TYPE_TABLE);
        e_week_view_type = gtk_type_unique (GTK_TYPE_TABLE,
                            &e_week_view_info);
    }

    return e_week_view_type;
}


static void
e_week_view_class_init (EWeekViewClass *class)
{
    GtkObjectClass *object_class;
    GtkWidgetClass *widget_class;

    object_class = (GtkObjectClass *) class;
    widget_class = (GtkWidgetClass *) class;

    /* Method override */
    object_class->destroy       = e_week_view_destroy;

    widget_class->realize       = e_week_view_realize;
    widget_class->unrealize     = e_week_view_unrealize;
    widget_class->style_set     = e_week_view_style_set;
    widget_class->size_allocate = e_week_view_size_allocate;
    widget_class->focus_in_event    = e_week_view_focus_in;
    widget_class->focus_out_event   = e_week_view_focus_out;
    widget_class->key_press_event   = e_week_view_key_press;
    widget_class->expose_event  = e_week_view_expose_event;
    widget_class->draw      = e_week_view_draw;

    /* clipboard atom */
    if (!clipboard_atom)
        clipboard_atom = gdk_atom_intern ("CLIPBOARD", FALSE);
}


static void
e_week_view_init (EWeekView *week_view)
{
    GnomeCanvasGroup *canvas_group;
    GtkObject *adjustment;
    GdkPixbuf *pixbuf;
    gint i;

    GTK_WIDGET_SET_FLAGS (week_view, GTK_CAN_FOCUS);

    week_view->calendar = NULL;
    week_view->client = NULL;
    week_view->sexp = g_strdup ("#t"); /* match all by default */
    week_view->query = NULL;

    week_view->events = g_array_new (FALSE, FALSE,
                     sizeof (EWeekViewEvent));
    week_view->events_sorted = TRUE;
    week_view->events_need_layout = FALSE;
    week_view->events_need_reshape = FALSE;

    week_view->spans = NULL;

    week_view->multi_week_view = FALSE;
    week_view->weeks_shown = 6;
    week_view->rows = 6;
    week_view->columns = 2;
    week_view->compress_weekend = TRUE;
    week_view->show_event_end_times = TRUE;
    week_view->week_start_day = 0;      /* Monday. */
    week_view->display_start_day = 0;   /* Monday. */

    g_date_clear (&week_view->base_date, 1);
    g_date_clear (&week_view->first_day_shown, 1);

    week_view->row_height = 10;
    week_view->rows_per_cell = 1;

    week_view->selection_start_day = -1;
    week_view->selection_drag_pos = E_WEEK_VIEW_DRAG_NONE;

    week_view->pressed_event_num = -1;
    week_view->editing_event_num = -1;

    week_view->main_gc = NULL;

    /* Create the small font. */
    week_view->use_small_font = TRUE;
    week_view->small_font = gdk_font_load (E_WEEK_VIEW_SMALL_FONT);
    if (!week_view->small_font)
        week_view->small_font = gdk_font_load (E_WEEK_VIEW_SMALL_FONT_FALLBACK);
    if (!week_view->small_font)
        g_warning ("Couldn't load font");

    /* String to use in 12-hour time format for times in the morning. */
    week_view->am_string = _("am");

    /* String to use in 12-hour time format for times in the afternoon. */
    week_view->pm_string = _("pm");


    /*
     * Titles Canvas. Note that we don't show it is only shown in the
     * Month view.
     */
    week_view->titles_canvas = e_canvas_new ();
    gtk_table_attach (GTK_TABLE (week_view), week_view->titles_canvas,
              1, 2, 0, 1, GTK_EXPAND | GTK_FILL, GTK_FILL, 0, 0);

    canvas_group = GNOME_CANVAS_GROUP (GNOME_CANVAS (week_view->titles_canvas)->root);

    week_view->titles_canvas_item =
        gnome_canvas_item_new (canvas_group,
                       e_week_view_titles_item_get_type (),
                       "EWeekViewTitlesItem::week_view", week_view,
                       NULL);

    /*
     * Main Canvas
     */
    week_view->main_canvas = e_canvas_new ();
    gtk_table_attach (GTK_TABLE (week_view), week_view->main_canvas,
              1, 2, 1, 2,
              GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 1, 1);
    gtk_widget_show (week_view->main_canvas);

    canvas_group = GNOME_CANVAS_GROUP (GNOME_CANVAS (week_view->main_canvas)->root);

    week_view->main_canvas_item =
        gnome_canvas_item_new (canvas_group,
                       e_week_view_main_item_get_type (),
                       "EWeekViewMainItem::week_view", week_view,
                       NULL);

    gtk_signal_connect_after (GTK_OBJECT (week_view->main_canvas),
                  "button_press_event",
                  GTK_SIGNAL_FUNC (e_week_view_on_button_press),
                  week_view);
    gtk_signal_connect_after (GTK_OBJECT (week_view->main_canvas),
                  "button_release_event",
                  GTK_SIGNAL_FUNC (e_week_view_on_button_release),
                  week_view);
    gtk_signal_connect_after (GTK_OBJECT (week_view->main_canvas),
                  "motion_notify_event",
                  GTK_SIGNAL_FUNC (e_week_view_on_motion),
                  week_view);

    /* Create the buttons to jump to each days. */
    pixbuf = gdk_pixbuf_new_from_xpm_data ((const char**) jump_xpm);

    for (i = 0; i < E_WEEK_VIEW_MAX_WEEKS * 7; i++) {
        week_view->jump_buttons[i] = gnome_canvas_item_new
            (canvas_group,
             gnome_canvas_pixbuf_get_type (),
             "GnomeCanvasPixbuf::pixbuf", pixbuf,
             NULL);

        gtk_signal_connect (GTK_OBJECT (week_view->jump_buttons[i]),
                    "event",
                    GTK_SIGNAL_FUNC (e_week_view_on_jump_button_event),
                    week_view);
    }
    gdk_pixbuf_unref (pixbuf);

    /*
     * Scrollbar.
     */
    adjustment = gtk_adjustment_new (0, -52, 52, 1, 1, 1);
    gtk_signal_connect (adjustment, "value_changed",
                GTK_SIGNAL_FUNC (e_week_view_on_adjustment_changed),
                week_view);

    week_view->vscrollbar = gtk_vscrollbar_new (GTK_ADJUSTMENT (adjustment));
    gtk_table_attach (GTK_TABLE (week_view), week_view->vscrollbar,
              2, 3, 1, 2, 0, GTK_EXPAND | GTK_FILL, 0, 0);
    gtk_widget_show (week_view->vscrollbar);

    /* Create the cursors. */
    week_view->normal_cursor = gdk_cursor_new (GDK_LEFT_PTR);
    week_view->move_cursor = gdk_cursor_new (GDK_FLEUR);
    week_view->resize_width_cursor = gdk_cursor_new (GDK_SB_H_DOUBLE_ARROW);
    week_view->last_cursor_set = NULL;

    /* Set up the inivisible widget for the clipboard selections */
    week_view->invisible = gtk_invisible_new ();
    gtk_selection_add_target (week_view->invisible,
                  clipboard_atom,
                  GDK_SELECTION_TYPE_STRING,
                  0);
    gtk_signal_connect (GTK_OBJECT (week_view->invisible),
                "selection_get",
                GTK_SIGNAL_FUNC (selection_get),
                (gpointer) week_view);
    gtk_signal_connect (GTK_OBJECT (week_view->invisible),
                "selection_clear_event",
                GTK_SIGNAL_FUNC (selection_clear_event),
                (gpointer) week_view);
    gtk_signal_connect (GTK_OBJECT (week_view->invisible),
                "selection_received",
                GTK_SIGNAL_FUNC (selection_received),
                (gpointer) week_view);
    gtk_signal_connect (GTK_OBJECT (week_view->invisible),
                "destroy",
                GTK_SIGNAL_FUNC (invisible_destroyed),
                (gpointer) week_view);
    week_view->clipboard_selection = NULL;
}


/**
 * e_week_view_new:
 * @Returns: a new #EWeekView.
 *
 * Creates a new #EWeekView.
 **/
GtkWidget *
e_week_view_new (void)
{
    GtkWidget *week_view;

    week_view = GTK_WIDGET (gtk_type_new (e_week_view_get_type ()));

    return week_view;
}


static void
e_week_view_destroy (GtkObject *object)
{
    EWeekView *week_view;

    week_view = E_WEEK_VIEW (object);

    e_week_view_free_events (week_view);

    if (week_view->client) {
        gtk_signal_disconnect_by_data (GTK_OBJECT (week_view->client), week_view);
        gtk_object_unref (GTK_OBJECT (week_view->client));
        week_view->client = NULL;
    }

    if (week_view->sexp) {
        g_free (week_view->sexp);
        week_view->sexp = NULL;
    }

    if (week_view->query) {
        gtk_signal_disconnect_by_data (GTK_OBJECT (week_view->query), week_view);
        gtk_object_unref (GTK_OBJECT (week_view->query));
        week_view->query = NULL;
    }

    if (week_view->small_font)
        gdk_font_unref (week_view->small_font);

    gdk_cursor_destroy (week_view->normal_cursor);
    gdk_cursor_destroy (week_view->move_cursor);
    gdk_cursor_destroy (week_view->resize_width_cursor);

    if (week_view->invisible)
        gtk_widget_destroy (week_view->invisible);
    if (week_view->clipboard_selection)
        g_free (week_view->clipboard_selection);

    GTK_OBJECT_CLASS (parent_class)->destroy (object);
}


static void
e_week_view_realize (GtkWidget *widget)
{
    EWeekView *week_view;
    GdkColormap *colormap;
    gboolean success[E_WEEK_VIEW_COLOR_LAST];
    gint nfailed;

    if (GTK_WIDGET_CLASS (parent_class)->realize)
        (*GTK_WIDGET_CLASS (parent_class)->realize)(widget);

    week_view = E_WEEK_VIEW (widget);
    week_view->main_gc = gdk_gc_new (widget->window);

    colormap = gtk_widget_get_colormap (widget);

    /* Allocate the colors. */
    week_view->colors[E_WEEK_VIEW_COLOR_EVEN_MONTHS].red   = 0xeded;
    week_view->colors[E_WEEK_VIEW_COLOR_EVEN_MONTHS].green = 0xeded;
    week_view->colors[E_WEEK_VIEW_COLOR_EVEN_MONTHS].blue  = 0xeded;

    week_view->colors[E_WEEK_VIEW_COLOR_ODD_MONTHS].red   = 65535;
    week_view->colors[E_WEEK_VIEW_COLOR_ODD_MONTHS].green = 65535;
    week_view->colors[E_WEEK_VIEW_COLOR_ODD_MONTHS].blue  = 65535;

    week_view->colors[E_WEEK_VIEW_COLOR_EVENT_BACKGROUND].red   = 0xd6d6;
    week_view->colors[E_WEEK_VIEW_COLOR_EVENT_BACKGROUND].green = 0xd6d6;
    week_view->colors[E_WEEK_VIEW_COLOR_EVENT_BACKGROUND].blue  = 0xd6d6;

    week_view->colors[E_WEEK_VIEW_COLOR_EVENT_BORDER].red   = 0;
    week_view->colors[E_WEEK_VIEW_COLOR_EVENT_BORDER].green = 0;
    week_view->colors[E_WEEK_VIEW_COLOR_EVENT_BORDER].blue  = 0;

    week_view->colors[E_WEEK_VIEW_COLOR_EVENT_TEXT].red   = 0;
    week_view->colors[E_WEEK_VIEW_COLOR_EVENT_TEXT].green = 0;
    week_view->colors[E_WEEK_VIEW_COLOR_EVENT_TEXT].blue  = 0;

    week_view->colors[E_WEEK_VIEW_COLOR_GRID].red   = 0 * 257;
    week_view->colors[E_WEEK_VIEW_COLOR_GRID].green = 0 * 257;
    week_view->colors[E_WEEK_VIEW_COLOR_GRID].blue  = 0 * 257;

    week_view->colors[E_WEEK_VIEW_COLOR_SELECTED].red   = 0 * 257;
    week_view->colors[E_WEEK_VIEW_COLOR_SELECTED].green = 0 * 257;
    week_view->colors[E_WEEK_VIEW_COLOR_SELECTED].blue  = 156 * 257;

    week_view->colors[E_WEEK_VIEW_COLOR_DATES].red   = 0 * 257;
    week_view->colors[E_WEEK_VIEW_COLOR_DATES].green = 0 * 257;
    week_view->colors[E_WEEK_VIEW_COLOR_DATES].blue  = 0 * 257;

    week_view->colors[E_WEEK_VIEW_COLOR_DATES_SELECTED].red   = 65535;
    week_view->colors[E_WEEK_VIEW_COLOR_DATES_SELECTED].green = 65535;
    week_view->colors[E_WEEK_VIEW_COLOR_DATES_SELECTED].blue  = 65535;

    nfailed = gdk_colormap_alloc_colors (colormap, week_view->colors,
                         E_WEEK_VIEW_COLOR_LAST, FALSE,
                         TRUE, success);
    if (nfailed)
        g_warning ("Failed to allocate all colors");


    /* Create the pixmaps. */
    week_view->reminder_icon = gdk_pixmap_colormap_create_from_xpm_d (NULL, colormap, &week_view->reminder_mask, NULL, bell_xpm);
    week_view->recurrence_icon = gdk_pixmap_colormap_create_from_xpm_d (NULL, colormap, &week_view->recurrence_mask, NULL, recur_xpm);
}


static void
e_week_view_unrealize (GtkWidget *widget)
{
    EWeekView *week_view;
    GdkColormap *colormap;
    gint i;

    week_view = E_WEEK_VIEW (widget);

    gdk_gc_unref (week_view->main_gc);
    week_view->main_gc = NULL;

    colormap = gtk_widget_get_colormap (widget);
    for (i = 0; i < E_WEEK_VIEW_COLOR_LAST; i++)
        gdk_colors_free (colormap, &week_view->colors[i].pixel, 1, 0);

    gdk_pixmap_unref (week_view->reminder_icon);
    week_view->reminder_icon = NULL;
    gdk_pixmap_unref (week_view->recurrence_icon);
    week_view->recurrence_icon = NULL;

    if (GTK_WIDGET_CLASS (parent_class)->unrealize)
        (*GTK_WIDGET_CLASS (parent_class)->unrealize)(widget);
}


static void
e_week_view_style_set (GtkWidget *widget,
              GtkStyle  *previous_style)
{
    EWeekView *week_view;
    EWeekViewEventSpan *span;
    GdkFont *font;
    gint day, day_width, max_day_width, max_abbr_day_width;
    gint month, month_width, max_month_width, max_abbr_month_width;
    gint span_num;
    GDate date;
    gchar buffer[128];

    if (GTK_WIDGET_CLASS (parent_class)->style_set)
        (*GTK_WIDGET_CLASS (parent_class)->style_set)(widget, previous_style);

    week_view = E_WEEK_VIEW (widget);
    font = widget->style->font;

    /* Recalculate the height of each row based on the font size. */
    week_view->row_height = font->ascent + font->descent + E_WEEK_VIEW_EVENT_BORDER_HEIGHT * 2 + E_WEEK_VIEW_EVENT_TEXT_Y_PAD * 2;
    week_view->row_height = MAX (week_view->row_height, E_WEEK_VIEW_ICON_HEIGHT + E_WEEK_VIEW_ICON_Y_PAD + E_WEEK_VIEW_EVENT_BORDER_HEIGHT * 2);

    /* Set the height of the top canvas. */
    gtk_widget_set_usize (week_view->titles_canvas, -1,
                  font->ascent + font->descent + 5);

    /* Save the sizes of various strings in the font, so we can quickly
       decide which date formats to use. */
    g_date_clear (&date, 1);
    g_date_set_dmy (&date, 27, 3, 2000);    /* Must be a Monday. */

    max_day_width = 0;
    max_abbr_day_width = 0;
    for (day = 0; day < 7; day++) {
        g_date_strftime (buffer, 128, "%A", &date);
        day_width = gdk_string_width (font, buffer);
        week_view->day_widths[day] = day_width;
        max_day_width = MAX (max_day_width, day_width);

        g_date_strftime (buffer, 128, "%a", &date);
        day_width = gdk_string_width (font, buffer);
        week_view->abbr_day_widths[day] = day_width;
        max_abbr_day_width = MAX (max_abbr_day_width, day_width);

        g_date_add_days (&date, 1);
    }

    max_month_width = 0;
    max_abbr_month_width = 0;
    for (month = 0; month < 12; month++) {
        g_date_set_month (&date, month + 1);

        g_date_strftime (buffer, 128, "%B", &date);
        month_width = gdk_string_width (font, buffer);
        week_view->month_widths[month] = month_width;
        max_month_width = MAX (max_month_width, month_width);

        g_date_strftime (buffer, 128, "%b", &date);
        month_width = gdk_string_width (font, buffer);
        week_view->abbr_month_widths[month] = month_width;
        max_abbr_month_width = MAX (max_abbr_month_width, month_width);
    }

    week_view->space_width = gdk_string_width (font, " ");
    week_view->colon_width = gdk_string_width (font, ":");
    week_view->slash_width = gdk_string_width (font, "/");
    week_view->digit_width = gdk_string_width (font, "5");
    if (week_view->small_font)
        week_view->small_digit_width = gdk_string_width (week_view->small_font, "5");
    week_view->max_day_width = max_day_width;
    week_view->max_abbr_day_width = max_abbr_day_width;
    week_view->max_month_width = max_month_width;
    week_view->max_abbr_month_width = max_abbr_month_width;

    week_view->am_string_width = gdk_string_width (font,
                               week_view->am_string);
    week_view->pm_string_width = gdk_string_width (font,
                               week_view->pm_string);

    /* Set the font of all the EText items. */
    if (week_view->spans) {
        for (span_num = 0; span_num < week_view->spans->len;
             span_num++) {
            span = &g_array_index (week_view->spans,
                           EWeekViewEventSpan, span_num);
            if (span->text_item)
                gnome_canvas_item_set (span->text_item,
                               "font_gdk", font,
                               NULL);
        }
    }
}


/* This recalculates the sizes of each column. */
static void
e_week_view_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
{
    EWeekView *week_view;
    gdouble old_x2, old_y2, new_x2, new_y2;

    week_view = E_WEEK_VIEW (widget);

    (*GTK_WIDGET_CLASS (parent_class)->size_allocate) (widget, allocation);

    e_week_view_recalc_cell_sizes (week_view);

    /* Set the scroll region of the top canvas to its allocated size. */
    gnome_canvas_get_scroll_region (GNOME_CANVAS (week_view->titles_canvas),
                    NULL, NULL, &old_x2, &old_y2);
    new_x2 = week_view->titles_canvas->allocation.width - 1;
    new_y2 = week_view->titles_canvas->allocation.height - 1;
    if (old_x2 != new_x2 || old_y2 != new_y2)
        gnome_canvas_set_scroll_region (GNOME_CANVAS (week_view->titles_canvas),
                        0, 0, new_x2, new_y2);


    /* Set the scroll region of the main canvas to its allocated width,
       but with the height depending on the number of rows needed. */
    gnome_canvas_get_scroll_region (GNOME_CANVAS (week_view->main_canvas),
                    NULL, NULL, &old_x2, &old_y2);
    new_x2 = week_view->main_canvas->allocation.width - 1;
    new_y2 = week_view->main_canvas->allocation.height - 1;
    if (old_x2 != new_x2 || old_y2 != new_y2)
        gnome_canvas_set_scroll_region (GNOME_CANVAS (week_view->main_canvas),
                        0, 0, new_x2, new_y2);

    /* Flag that we need to reshape the events. */
    if (old_x2 != new_x2 || old_y2 != new_y2) {
        week_view->events_need_reshape = TRUE;
        e_week_view_check_layout (week_view);
    }
}


static void
e_week_view_recalc_cell_sizes (EWeekView *week_view)
{
    gfloat canvas_width, canvas_height, offset;
    gint row, col;
    GtkWidget *widget;
    GdkFont *font;
    gint width, height, time_width;

    if (week_view->multi_week_view) {
        week_view->rows = week_view->weeks_shown * 2;
        week_view->columns = week_view->compress_weekend ? 6 : 7;
    } else {
        week_view->rows = 6;
        week_view->columns = 2;
    }

    /* Calculate the column sizes, using floating point so that pixels
       get divided evenly. Note that we use one more element than the
       number of columns, to make it easy to get the column widths.
       We also add one to the width so that the right border of the last
       column is off the edge of the displayed area. */
    canvas_width = week_view->main_canvas->allocation.width + 1;
    canvas_width /= week_view->columns;
    offset = 0;
    for (col = 0; col <= week_view->columns; col++) {
        week_view->col_offsets[col] = floor (offset + 0.5);
        offset += canvas_width;
    }

    /* Calculate the cell widths based on the offsets. */
    for (col = 0; col < week_view->columns; col++) {
        week_view->col_widths[col] = week_view->col_offsets[col + 1]
            - week_view->col_offsets[col];
    }

    /* Now do the same for the row heights. */
    canvas_height = week_view->main_canvas->allocation.height + 1;
    canvas_height /= week_view->rows;
    offset = 0;
    for (row = 0; row <= week_view->rows; row++) {
        week_view->row_offsets[row] = floor (offset + 0.5);
        offset += canvas_height;
    }

    /* Calculate the cell heights based on the offsets. */
    for (row = 0; row < week_view->rows; row++) {
        week_view->row_heights[row] = week_view->row_offsets[row + 1]
            - week_view->row_offsets[row];
    }


    /* If the font hasn't been set yet just return. */
    widget = GTK_WIDGET (week_view);
    if (!widget->style || ! widget->style->font)
        return;

    font = widget->style->font;

    /* Calculate the number of rows of events in each cell, for the large
       cells and the compressed weekend cells. */
    if (week_view->multi_week_view) {
        week_view->events_y_offset = E_WEEK_VIEW_DATE_T_PAD
            + font->ascent + font->descent
            + E_WEEK_VIEW_DATE_B_PAD;
    } else {
        week_view->events_y_offset = E_WEEK_VIEW_DATE_T_PAD
            + font->ascent + font->descent
            + E_WEEK_VIEW_DATE_LINE_T_PAD + 1
            + E_WEEK_VIEW_DATE_LINE_B_PAD;
    }

    height = week_view->row_heights[0];
    week_view->rows_per_cell = (height * 2 - week_view->events_y_offset)
        / (week_view->row_height + E_WEEK_VIEW_EVENT_Y_SPACING);
    week_view->rows_per_cell = MIN (week_view->rows_per_cell,
                    E_WEEK_VIEW_MAX_ROWS_PER_CELL);

    week_view->rows_per_compressed_cell =
        (height - week_view->events_y_offset)
        / (week_view->row_height + E_WEEK_VIEW_EVENT_Y_SPACING);
    week_view->rows_per_compressed_cell = MIN (week_view->rows_per_compressed_cell,
                           E_WEEK_VIEW_MAX_ROWS_PER_CELL);

    /* Determine which time format to use, based on the width of the cells.
       We only allow the time to take up about half of the width. */
    width = week_view->col_widths[0];

    time_width = e_week_view_get_time_string_width (week_view);

    week_view->time_format = E_WEEK_VIEW_TIME_NONE;
    if (week_view->use_small_font && week_view->small_font) {
        if (week_view->show_event_end_times
            && width / 2 > time_width * 2 + E_WEEK_VIEW_EVENT_TIME_SPACING)
            week_view->time_format = E_WEEK_VIEW_TIME_BOTH_SMALL_MIN;
        else if (width / 2 > time_width)
            week_view->time_format = E_WEEK_VIEW_TIME_START_SMALL_MIN;
    } else {
        if (week_view->show_event_end_times
            && width / 2 > time_width * 2 + E_WEEK_VIEW_EVENT_TIME_SPACING)
            week_view->time_format = E_WEEK_VIEW_TIME_BOTH;
        else if (width / 2 > time_width)
            week_view->time_format = E_WEEK_VIEW_TIME_START;
    }
}


static gint
e_week_view_focus_in (GtkWidget *widget, GdkEventFocus *event)
{
    EWeekView *week_view;

    g_return_val_if_fail (widget != NULL, FALSE);
    g_return_val_if_fail (E_IS_WEEK_VIEW (widget), FALSE);
    g_return_val_if_fail (event != NULL, FALSE);

    week_view = E_WEEK_VIEW (widget);

    GTK_WIDGET_SET_FLAGS (widget, GTK_HAS_FOCUS);

    gtk_widget_queue_draw (week_view->main_canvas);

    return FALSE;
}


static gint
e_week_view_focus_out (GtkWidget *widget, GdkEventFocus *event)
{
    EWeekView *week_view;

    g_return_val_if_fail (widget != NULL, FALSE);
    g_return_val_if_fail (E_IS_WEEK_VIEW (widget), FALSE);
    g_return_val_if_fail (event != NULL, FALSE);

    week_view = E_WEEK_VIEW (widget);

    GTK_WIDGET_UNSET_FLAGS (widget, GTK_HAS_FOCUS);

    gtk_widget_queue_draw (week_view->main_canvas);

    return FALSE;
}


/* This draws a shadow around the top display and main display. */
static gint
e_week_view_expose_event (GtkWidget *widget,
              GdkEventExpose *event)
{
    EWeekView *week_view;

    week_view = E_WEEK_VIEW (widget);

    e_week_view_draw_shadow (week_view);

    if (GTK_WIDGET_CLASS (parent_class)->expose_event)
        (*GTK_WIDGET_CLASS (parent_class)->expose_event)(widget, event);

    return FALSE;
}


static void
e_week_view_draw (GtkWidget    *widget,
          GdkRectangle *area)
{
    EWeekView *week_view;

    week_view = E_WEEK_VIEW (widget);

    e_week_view_draw_shadow (week_view);

    if (GTK_WIDGET_CLASS (parent_class)->draw)
        (*GTK_WIDGET_CLASS (parent_class)->draw)(widget, area);
}


static void
e_week_view_draw_shadow (EWeekView *week_view)
{
    gint x1, y1, x2, y2;
    GtkStyle *style;
    GdkGC *light_gc, *dark_gc;
    GdkWindow *window;

    /* Draw the shadow around the graphical displays. */
    x1 = week_view->main_canvas->allocation.x - 1;
    y1 = week_view->main_canvas->allocation.y - 1;
    x2 = x1 + week_view->main_canvas->allocation.width + 2;
    y2 = y1 + week_view->main_canvas->allocation.height + 2;

    style = GTK_WIDGET (week_view)->style;
    dark_gc = style->dark_gc[GTK_STATE_NORMAL];
    light_gc = style->light_gc[GTK_STATE_NORMAL];

    window = GTK_WIDGET (week_view)->window;
    gdk_draw_line (window, dark_gc, x1, y1, x1, y2);
    gdk_draw_line (window, dark_gc, x1, y1, x2, y1);
    gdk_draw_line (window, light_gc, x2, y1, x2, y2);
    gdk_draw_line (window, light_gc, x1, y2, x2, y2);
}


void
e_week_view_set_calendar    (EWeekView  *week_view,
                 GnomeCalendar  *calendar)
{
    g_return_if_fail (E_IS_WEEK_VIEW (week_view));

    week_view->calendar = calendar;
}


/* Callback used when a component is updated in the live query */
static void
query_obj_updated_cb (CalQuery *query, const char *uid,
              gboolean query_in_progress, int n_scanned, int total,
              gpointer data)
{
    EWeekView *week_view;
    EWeekViewEvent *event;
    gint event_num, num_days;
    CalComponent *comp;
    CalClientGetStatus status;

    week_view = E_WEEK_VIEW (data);

    /* If we don't have a valid date set yet, just return. */
    if (!g_date_valid (&week_view->first_day_shown))
        return;

    /* Get the event from the server. */
    status = cal_client_get_object (week_view->client, uid, &comp);

    switch (status) {
    case CAL_CLIENT_GET_SUCCESS:
        /* Everything is fine */
        break;

    case CAL_CLIENT_GET_SYNTAX_ERROR:
        g_message ("obj_updated_cb(): Syntax error when getting object `%s'", uid);
        return;

    case CAL_CLIENT_GET_NOT_FOUND:
        /* The object is no longer in the server, so do nothing */
        return;
    }

    /* If the event already exists and the dates didn't change, we can
       update the event fairly easily without changing the events arrays
       or computing a new layout. */
    if (e_week_view_find_event_from_uid (week_view, uid, &event_num)) {
        event = &g_array_index (week_view->events, EWeekViewEvent,
                    event_num);

        if (!cal_component_has_recurrences (comp)
            && !cal_component_has_recurrences (event->comp)
            && cal_component_event_dates_match (comp, event->comp)) {
#if 0
            g_print ("updated object's dates unchanged\n");
#endif
            e_week_view_foreach_event_with_uid (week_view, uid, e_week_view_update_event_cb, comp);
            gtk_object_unref (GTK_OBJECT (comp));
            gtk_widget_queue_draw (week_view->main_canvas);
            return;
        }

        /* The dates have changed, so we need to remove the
           old occurrrences before adding the new ones. */
#if 0
        g_print ("dates changed - removing occurrences\n");
#endif
        e_week_view_foreach_event_with_uid (week_view, uid,
                            e_week_view_remove_event_cb,
                            NULL);
    }

    /* Add the occurrences of the event. */
    num_days = week_view->multi_week_view ? week_view->weeks_shown * 7 : 7;

    cal_recur_generate_instances (comp,
                      week_view->day_starts[0],
                      week_view->day_starts[num_days],
                      e_week_view_add_event,
                      week_view);

    gtk_object_unref (GTK_OBJECT (comp));

    e_week_view_check_layout (week_view);

    gtk_widget_queue_draw (week_view->main_canvas);
}

/* Callback used when a component is removed from the live query */
static void
query_obj_removed_cb (CalClient *client, const char *uid, gpointer data)
{
    EWeekView *week_view;

    week_view = E_WEEK_VIEW (data);

    e_week_view_foreach_event_with_uid (week_view, uid,
                        e_week_view_remove_event_cb, NULL);

    e_week_view_check_layout (week_view);
    gtk_widget_queue_draw (week_view->main_canvas);
}

/* Callback used when a query ends */
static void
query_query_done_cb (CalQuery *query, CalQueryDoneStatus status, const char *error_str, gpointer data)
{
    EWeekView *week_view;

    week_view = E_WEEK_VIEW (data);

    /* FIXME */

    if (status != CAL_QUERY_DONE_SUCCESS)
        fprintf (stderr, "query done: %s\n", error_str);
}

/* Callback used when an evaluation error occurs when running a query */
static void
query_eval_error_cb (CalQuery *query, const char *error_str, gpointer data)
{
    EWeekView *week_view;

    week_view = E_WEEK_VIEW (data);

    /* FIXME */

    fprintf (stderr, "eval error: %s\n", error_str);
}

/* Builds a complete query sexp for the week view by adding the predicates to
 * filter only for VEVENTS that fit in the week view's time range.
 */
static char *
adjust_query_sexp (EWeekView *week_view, const char *sexp)
{
    int num_days;
    char *start, *end;
    char *new_sexp;

    /* If the dates have not been set yet, we just want an empty query. */
    if (!g_date_valid (&week_view->first_day_shown))
        return g_strdup ("#f");

    num_days = week_view->multi_week_view ? week_view->weeks_shown * 7 : 7;

    start = isodate_from_time_t (week_view->day_starts[0]);
    end = isodate_from_time_t (week_view->day_starts[num_days]);

    new_sexp = g_strdup_printf ("(and (= (get-vtype) \"VEVENT\")"
                    "     (occur-in-time-range? (make-time \"%s\")"
                    "                           (make-time \"%s\"))"
                    "     %s)",
                    start, end,
                    sexp);

    g_free (start);
    g_free (end);

    return new_sexp;
}

/* Restarts a query for the week view */
static void
update_query (EWeekView *week_view)
{
    char *real_sexp;

    e_week_view_free_events (week_view);
    gtk_widget_queue_draw (week_view->main_canvas);

    if (!(week_view->client
          && cal_client_get_load_state (week_view->client) == CAL_CLIENT_LOAD_LOADED))
        return;

    if (week_view->query) {
        gtk_signal_disconnect_by_data (GTK_OBJECT (week_view->query), week_view);
        gtk_object_unref (GTK_OBJECT (week_view->query));
    }

    g_assert (week_view->sexp != NULL);
    real_sexp = adjust_query_sexp (week_view, week_view->sexp);

    week_view->query = cal_client_get_query (week_view->client, real_sexp);
    g_free (real_sexp);

    if (!week_view->query) {
        g_message ("update_query(): Could not create the query");
        return;
    }

    gtk_signal_connect (GTK_OBJECT (week_view->query), "obj_updated",
                GTK_SIGNAL_FUNC (query_obj_updated_cb), week_view);
    gtk_signal_connect (GTK_OBJECT (week_view->query), "obj_removed",
                GTK_SIGNAL_FUNC (query_obj_removed_cb), week_view);
    gtk_signal_connect (GTK_OBJECT (week_view->query), "query_done",
                GTK_SIGNAL_FUNC (query_query_done_cb), week_view);
    gtk_signal_connect (GTK_OBJECT (week_view->query), "eval_error",
                GTK_SIGNAL_FUNC (query_eval_error_cb), week_view);
}

/* Callback used when the calendar client finishes opening */
static void
cal_opened_cb (CalClient *client, CalClientOpenStatus status, gpointer data)
{
    EWeekView *week_view;

    week_view = E_WEEK_VIEW (data);

    if (status != CAL_CLIENT_OPEN_SUCCESS)
        return;

    update_query (week_view);
}

/**
 * e_week_view_set_cal_client:
 * @week_view: A week view.
 * @client: A calendar client interface object.
 *
 * Sets the calendar client interface object that a week view will monitor.
 **/
void
e_week_view_set_cal_client  (EWeekView  *week_view,
                 CalClient  *client)
{
    g_return_if_fail (week_view != NULL);
    g_return_if_fail (E_IS_WEEK_VIEW (week_view));

    if (client == week_view->client)
        return;

    if (client)
        g_return_if_fail (IS_CAL_CLIENT (client));

    if (client)
        gtk_object_ref (GTK_OBJECT (client));

    if (week_view->client) {
        gtk_signal_disconnect_by_data (GTK_OBJECT (week_view->client), week_view);
        gtk_object_unref (GTK_OBJECT (week_view->client));
    }

    week_view->client = client;

    if (week_view->client) {
        if (cal_client_get_load_state (week_view->client) == CAL_CLIENT_LOAD_LOADED)
            update_query (week_view);
        else
            gtk_signal_connect (GTK_OBJECT (week_view->client), "cal_opened",
                        GTK_SIGNAL_FUNC (cal_opened_cb), week_view);
    }
}

/**
 * e_week_view_set_query:
 * @week_view: A week view.
 * @sexp: S-expression that defines the query.
 * 
 * Sets the query sexp that the week view will use for filtering the displayed
 * events.
 **/
void
e_week_view_set_query (EWeekView *week_view, const char *sexp)
{
    g_return_if_fail (week_view != NULL);
    g_return_if_fail (E_IS_WEEK_VIEW (week_view));
    g_return_if_fail (sexp != NULL);

    if (week_view->sexp)
        g_free (week_view->sexp);

    week_view->sexp = g_strdup (sexp);

    update_query (week_view);
}


/* This sets the selected time range. The EWeekView will show the corresponding
   month and the days between start_time and end_time will be selected.
   To select a single day, use the same value for start_time & end_time. */
void
e_week_view_set_selected_time_range (EWeekView  *week_view,
                     time_t      start_time,
                     time_t      end_time)
{
    GDate date, base_date, end_date;
    gint day_offset, weekday, week_start_offset, num_days;
    gboolean update_adjustment_value = FALSE;

    g_return_if_fail (E_IS_WEEK_VIEW (week_view));

    g_date_clear (&date, 1);
    g_date_set_time (&date, start_time);

    if (week_view->multi_week_view) {
        /* Find the number of days since the start of the month. */
        day_offset = g_date_day (&date) - 1;

        /* Find the 1st week which starts at or before the start of
           the month. */
        base_date = date;
        g_date_set_day (&base_date, 1);

        /* Calculate the weekday of the 1st of the month, 0 = Mon. */
        weekday = g_date_weekday (&base_date) - 1;

        /* Convert it to an offset from the start of the display. */
        week_start_offset = (weekday + 7 - week_view->display_start_day) % 7;

        /* Add it to the day offset so we go back to the 1st week at
           or before the start of the month. */
        day_offset += week_start_offset;
    } else {
        /* Calculate the weekday of the given date, 0 = Mon. */
        weekday = g_date_weekday (&date) - 1;

        /* Convert it to an offset from the start of the display. */
        week_start_offset = (weekday + 7 - week_view->display_start_day) % 7;

        /* Set the day_offset to the result, so we move back to the
           start of the week. */
        day_offset = week_start_offset;
    }

    /* Calculate the base date, i.e. the first day shown when the
       scrollbar adjustment value is 0. */
    base_date = date;
    g_date_subtract_days (&base_date, day_offset);

    /* See if we need to update the base date. */
    if (!g_date_valid (&week_view->base_date)
        || g_date_compare (&week_view->base_date, &base_date)) {
        week_view->base_date = base_date;
        update_adjustment_value = TRUE;
    }

    /* See if we need to update the first day shown. */
    if (!g_date_valid (&week_view->first_day_shown)
        || g_date_compare (&week_view->first_day_shown, &base_date)) {
        week_view->first_day_shown = base_date;
        start_time = time_add_day (start_time, -day_offset);
        start_time = time_day_begin (start_time);
        e_week_view_recalc_day_starts (week_view, start_time);
        update_query (week_view);
    }

    /* Set the selection to the given days. */
    week_view->selection_start_day = g_date_julian (&date)
        - g_date_julian (&base_date);
    if (end_time == start_time
        || end_time <= time_add_day (start_time, 1))
        week_view->selection_end_day = week_view->selection_start_day;
    else {
        g_date_clear (&end_date, 1);
        g_date_set_time (&end_date, end_time - 60);
        week_view->selection_end_day = g_date_julian (&end_date)
            - g_date_julian (&base_date);
    }

    /* Make sure the selection is valid. */
    num_days = week_view->multi_week_view ? week_view->weeks_shown * 7 : 7;
    num_days--;
    week_view->selection_start_day = CLAMP (week_view->selection_start_day,
                        0, num_days);
    week_view->selection_end_day = CLAMP (week_view->selection_end_day,
                          week_view->selection_start_day,
                          num_days);

    /* Reset the adjustment value to 0 if the base address has changed.
       Note that we do this after updating first_day_shown so that our
       signal handler will not try to reload the events. */
    if (update_adjustment_value)
        gtk_adjustment_set_value (GTK_RANGE (week_view->vscrollbar)->adjustment, 0);

    gtk_widget_queue_draw (week_view->main_canvas);
}


/* Returns the selected time range. */
void
e_week_view_get_selected_time_range (EWeekView  *week_view,
                     time_t     *start_time,
                     time_t     *end_time)
{
    gint start_day, end_day;

    start_day = week_view->selection_start_day;
    end_day = week_view->selection_end_day;

    if (start_day == -1) {
        start_day = 0;
        end_day = 0;
    }

    if (start_time)
        *start_time = week_view->day_starts[start_day];

    if (end_time)
        *end_time = week_view->day_starts[end_day + 1];
}


/* Note that the returned date may be invalid if no date has been set yet. */
void
e_week_view_get_first_day_shown     (EWeekView  *week_view,
                     GDate      *date)
{
    *date = week_view->first_day_shown;
}


/* This sets the first day shown in the view. It will be rounded down to the
   nearest week. */
void
e_week_view_set_first_day_shown     (EWeekView  *week_view,
                     GDate      *date)
{
    GDate base_date;
    gint weekday, day_offset, num_days;
    gboolean update_adjustment_value = FALSE;
    guint32 old_selection_start_julian = 0, old_selection_end_julian = 0;
    struct tm start_tm;
    time_t start_time;

    g_return_if_fail (E_IS_WEEK_VIEW (week_view));

    /* Calculate the old selection range. */
    if (week_view->selection_start_day != -1) {
        old_selection_start_julian =
            g_date_julian (&week_view->base_date)
            + week_view->selection_start_day;
        old_selection_end_julian =
            g_date_julian (&week_view->base_date)
            + week_view->selection_end_day;
    }

    /* Calculate the weekday of the given date, 0 = Mon. */
    weekday = g_date_weekday (date) - 1;

    /* Convert it to an offset from the start of the display. */
    day_offset = (weekday + 7 - week_view->display_start_day) % 7;

    /* Calculate the base date, i.e. the first day shown when the
       scrollbar adjustment value is 0. */
    base_date = *date;
    g_date_subtract_days (&base_date, day_offset);

    /* See if we need to update the base date. */
    if (!g_date_valid (&week_view->base_date)
        || g_date_compare (&week_view->base_date, &base_date)) {
        week_view->base_date = base_date;
        update_adjustment_value = TRUE;
    }

    /* See if we need to update the first day shown. */
    if (!g_date_valid (&week_view->first_day_shown)
        || g_date_compare (&week_view->first_day_shown, &base_date)) {
        week_view->first_day_shown = base_date;
        g_date_to_struct_tm (&base_date, &start_tm);
        start_time = mktime (&start_tm);
        e_week_view_recalc_day_starts (week_view, start_time);
        update_query (week_view);
    }

    /* Try to keep the previous selection, but if it is no longer shown
       just select the first day. */
    if (week_view->selection_start_day != -1) {
        week_view->selection_start_day = old_selection_start_julian
            - g_date_julian (&base_date);
        week_view->selection_end_day = old_selection_end_julian
            - g_date_julian (&base_date);

        /* Make sure the selection is valid. */
        num_days = week_view->multi_week_view
            ? week_view->weeks_shown * 7 : 7;
        num_days--;
        week_view->selection_start_day =
            CLAMP (week_view->selection_start_day, 0, num_days);
        week_view->selection_end_day =
            CLAMP (week_view->selection_end_day,
                   week_view->selection_start_day,
                   num_days);
    }

    /* Reset the adjustment value to 0 if the base address has changed.
       Note that we do this after updating first_day_shown so that our
       signal handler will not try to reload the events. */
    if (update_adjustment_value)
        gtk_adjustment_set_value (GTK_RANGE (week_view->vscrollbar)->adjustment, 0);

    gtk_widget_queue_draw (week_view->main_canvas);
}


/* Recalculates the time_t corresponding to the start of each day. */
static void
e_week_view_recalc_day_starts (EWeekView *week_view,
                   time_t lower)
{
    gint num_days, day;
    time_t tmp_time;

    num_days = week_view->multi_week_view ? week_view->weeks_shown * 7 : 7;

    tmp_time = lower;
    week_view->day_starts[0] = tmp_time;
    for (day = 1; day <= num_days; day++) {
        tmp_time = time_add_day (tmp_time, 1);
        week_view->day_starts[day] = tmp_time;
    }
}


gboolean
e_week_view_get_multi_week_view (EWeekView  *week_view)
{
    g_return_val_if_fail (E_IS_WEEK_VIEW (week_view), FALSE);

    return week_view->multi_week_view;
}


void
e_week_view_set_multi_week_view (EWeekView  *week_view,
                 gboolean    multi_week_view)
{
    GtkAdjustment *adjustment;
    gint page_increment, page_size;

    g_return_if_fail (E_IS_WEEK_VIEW (week_view));

    if (week_view->multi_week_view == multi_week_view)
        return;

    week_view->multi_week_view = multi_week_view;

    if (multi_week_view) {
        gtk_widget_show (week_view->titles_canvas);
        page_increment = 4;
        page_size = 5;
    } else {
        gtk_widget_hide (week_view->titles_canvas);
        page_increment = page_size = 1;
    }

    adjustment = GTK_RANGE (week_view->vscrollbar)->adjustment;
    adjustment->page_increment = page_increment;
    adjustment->page_size = page_size;
    gtk_adjustment_changed (adjustment);

    e_week_view_recalc_cell_sizes (week_view);

    if (g_date_valid (&week_view->first_day_shown))
        e_week_view_set_first_day_shown (week_view,
                         &week_view->first_day_shown);
}


gint
e_week_view_get_weeks_shown (EWeekView  *week_view)
{
    g_return_val_if_fail (E_IS_WEEK_VIEW (week_view), 1);

    return week_view->weeks_shown;
}


void
e_week_view_set_weeks_shown (EWeekView  *week_view,
                 gint        weeks_shown)
{
    GtkAdjustment *adjustment;
    gint page_increment, page_size;

    g_return_if_fail (E_IS_WEEK_VIEW (week_view));

    weeks_shown = MIN (weeks_shown, E_WEEK_VIEW_MAX_WEEKS);

    if (week_view->weeks_shown == weeks_shown)
        return;

    week_view->weeks_shown = weeks_shown;

    if (week_view->multi_week_view) {
        page_increment = 4;
        page_size = 5;

        adjustment = GTK_RANGE (week_view->vscrollbar)->adjustment;
        adjustment->page_increment = page_increment;
        adjustment->page_size = page_size;
        gtk_adjustment_changed (adjustment);

        e_week_view_recalc_cell_sizes (week_view);

        if (g_date_valid (&week_view->first_day_shown))
            e_week_view_set_first_day_shown (week_view, &week_view->first_day_shown);

        update_query (week_view);
    }
}


gboolean
e_week_view_get_compress_weekend    (EWeekView  *week_view)
{
    g_return_val_if_fail (E_IS_WEEK_VIEW (week_view), FALSE);

    return week_view->compress_weekend;
}


void
e_week_view_set_compress_weekend    (EWeekView  *week_view,
                     gboolean    compress)
{
    gboolean need_reload = FALSE;

    g_return_if_fail (E_IS_WEEK_VIEW (week_view));

    if (week_view->compress_weekend == compress)
        return;

    week_view->compress_weekend = compress;

    /* The option only affects the month view. */
    if (!week_view->multi_week_view)
        return;

    e_week_view_recalc_cell_sizes (week_view);

    need_reload = e_week_view_recalc_display_start_day (week_view);

    /* If the display_start_day has changed we need to recalculate the
       date range shown and reload all events, otherwise we only need to
       do a reshape. */
    if (need_reload) {
        /* Recalculate the days shown and reload if necessary. */
        if (g_date_valid (&week_view->first_day_shown))
            e_week_view_set_first_day_shown (week_view, &week_view->first_day_shown);
    } else {
        week_view->events_need_reshape = TRUE;
        e_week_view_check_layout (week_view);
    }
}


/* Whether we display event end times. */
gboolean
e_week_view_get_show_event_end_times    (EWeekView  *week_view)
{
    g_return_val_if_fail (E_IS_WEEK_VIEW (week_view), TRUE);

    return week_view->show_event_end_times;
}


void
e_week_view_set_show_event_end_times    (EWeekView  *week_view,
                     gboolean    show)
{
    g_return_if_fail (E_IS_WEEK_VIEW (week_view));

    if (week_view->show_event_end_times != show) {
        week_view->show_event_end_times = show;
        e_week_view_recalc_cell_sizes (week_view);
        week_view->events_need_reshape = TRUE;
        e_week_view_check_layout (week_view);
    }
}


/* The first day of the week, 0 (Monday) to 6 (Sunday). */
gint
e_week_view_get_week_start_day  (EWeekView  *week_view)
{
    g_return_val_if_fail (E_IS_WEEK_VIEW (week_view), 0);

    return week_view->week_start_day;
}


void
e_week_view_set_week_start_day  (EWeekView  *week_view,
                 gint        week_start_day)
{
    g_return_if_fail (E_IS_WEEK_VIEW (week_view));
    g_return_if_fail (week_start_day >= 0);
    g_return_if_fail (week_start_day < 7);

    if (week_view->week_start_day == week_start_day)
        return;

    week_view->week_start_day = week_start_day;

    e_week_view_recalc_display_start_day (week_view);

    /* Recalculate the days shown and reload if necessary. */
    if (g_date_valid (&week_view->first_day_shown))
        e_week_view_set_first_day_shown (week_view,
                         &week_view->first_day_shown);
}


/* Whether we use 12-hour or 24-hour format. */
gboolean
e_week_view_get_24_hour_format  (EWeekView  *week_view)
{
    g_return_val_if_fail (E_IS_WEEK_VIEW (week_view), FALSE);

    return week_view->use_24_hour_format;
}


void
e_week_view_set_24_hour_format  (EWeekView  *week_view,
                 gboolean    use_24_hour)
{
    g_return_if_fail (E_IS_WEEK_VIEW (week_view));

    if (week_view->use_24_hour_format == use_24_hour)
        return;

    week_view->use_24_hour_format = use_24_hour;

    /* We need to re-layout the events since the time format affects the
       sizes. */
    e_week_view_recalc_cell_sizes (week_view);
    week_view->events_need_reshape = TRUE;
    e_week_view_check_layout (week_view);
    gtk_widget_queue_draw (week_view->main_canvas);
}


static gboolean
e_week_view_recalc_display_start_day    (EWeekView  *week_view)
{
    gint display_start_day;

    /* The display start day defaults to week_start_day, but we have
       to use Saturday if the weekend is compressed and week_start_day
       is Sunday. */
    display_start_day = week_view->week_start_day;

    if (display_start_day == 6
        && (!week_view->multi_week_view || week_view->compress_weekend))
        display_start_day = 5;

    if (week_view->display_start_day != display_start_day) {
        week_view->display_start_day = display_start_day;
        return TRUE;
    }

    return FALSE;
}


static gboolean
e_week_view_update_event_cb (EWeekView *week_view,
                 gint event_num,
                 gpointer data)
{
    EWeekViewEvent *event;
    EWeekViewEventSpan *span;
    gint span_num;
    gchar *text;
    CalComponent *comp;

    comp = data;

    event = &g_array_index (week_view->events, EWeekViewEvent, event_num);

    gtk_object_unref (GTK_OBJECT (event->comp));
    event->comp = comp;
    gtk_object_ref (GTK_OBJECT (comp));

    for (span_num = 0; span_num < event->num_spans; span_num++) {
        span = &g_array_index (week_view->spans, EWeekViewEventSpan,
                       event->spans_index + span_num);

        if (span->text_item) {
            CalComponentText t;

            cal_component_get_summary (event->comp, &t);
            text = (char*) t.value;
            gnome_canvas_item_set (span->text_item,
                           "text", text ? text : "",
                           NULL);

            e_week_view_reshape_event_span (week_view, event_num,
                            span_num);
        }
    }

    return TRUE;
}


/* This calls a given function for each event instance that matches the given
   uid. Note that it is safe for the callback to remove the event (since we
   step backwards through the arrays). */
static void
e_week_view_foreach_event_with_uid (EWeekView *week_view,
                    const gchar *uid,
                    EWeekViewForeachEventCallback callback,
                    gpointer data)
{
    EWeekViewEvent *event;
    gint event_num;

    for (event_num = week_view->events->len - 1;
         event_num >= 0;
         event_num--) {
        const char *u;

        event = &g_array_index (week_view->events, EWeekViewEvent,
                    event_num);

        cal_component_get_uid (event->comp, &u);
        if (u && !strcmp (uid, u)) {
            if (!(*callback) (week_view, event_num, data))
                return;
        }
    }
}


static gboolean
e_week_view_remove_event_cb (EWeekView *week_view,
                 gint event_num,
                 gpointer data)
{
    EWeekViewEvent *event;
    EWeekViewEventSpan *span;
    gint span_num;

    event = &g_array_index (week_view->events, EWeekViewEvent, event_num);

    /* If we were editing this event, set editing_event_num to -1 so
       on_editing_stopped doesn't try to update the event. */
    if (week_view->editing_event_num == event_num)
        week_view->editing_event_num = -1;

    /* We leave the span elements in the array, but set the canvas item
       pointers to NULL. */
    for (span_num = 0; span_num < event->num_spans; span_num++) {
        span = &g_array_index (week_view->spans, EWeekViewEventSpan,
                       event->spans_index + span_num);

        if (span->text_item) {
            gtk_object_destroy (GTK_OBJECT (span->text_item));
            span->text_item = NULL;
        }
        if (span->background_item) {
            gtk_object_destroy (GTK_OBJECT (span->background_item));
            span->background_item = NULL;
        }
    }

    gtk_object_unref (GTK_OBJECT (event->comp));

    g_array_remove_index (week_view->events, event_num);
    week_view->events_need_layout = TRUE;

    return TRUE;
}


void
e_week_view_get_day_position    (EWeekView  *week_view,
                 gint        day,
                 gint       *day_x,
                 gint       *day_y,
                 gint       *day_w,
                 gint       *day_h)
{
    gint cell_x, cell_y, cell_h;

    e_week_view_layout_get_day_position (day,
                         week_view->multi_week_view,
                         week_view->weeks_shown,
                         week_view->display_start_day,
                         week_view->compress_weekend,
                         &cell_x, &cell_y, &cell_h);

    *day_x = week_view->col_offsets[cell_x];
    *day_y = week_view->row_offsets[cell_y];

    *day_w = week_view->col_widths[cell_x];
    *day_h = week_view->row_heights[cell_y];
    if (cell_h == 2)
        *day_h += week_view->row_heights[cell_y + 1];
}


/* Returns the bounding box for a span of an event. Usually this can easily
   be determined by the start & end days and row of the span, which are set in
   e_week_view_layout_event(). Though we need a special case for the weekends
   when they are compressed, since the span may not fit.
   The bounding box includes the entire width of the days in the view (but
   not the vertical line down the right of the last day), though the displayed
   event doesn't normally extend to the edges of the day.
   It returns FALSE if the span isn't visible. */
gboolean
e_week_view_get_span_position   (EWeekView  *week_view,
                 gint        event_num,
                 gint        span_num,
                 gint       *span_x,
                 gint       *span_y,
                 gint       *span_w)
{
    EWeekViewEvent *event;
    EWeekViewEventSpan *span;
    gint num_days;
    gint start_x, start_y, start_w, start_h;
    gint end_x, end_y, end_w, end_h;

    g_return_val_if_fail (E_IS_WEEK_VIEW (week_view), FALSE);
    g_return_val_if_fail (event_num < week_view->events->len, FALSE);

    event = &g_array_index (week_view->events, EWeekViewEvent, event_num);

    g_return_val_if_fail (span_num < event->num_spans, FALSE);

    span = &g_array_index (week_view->spans, EWeekViewEventSpan,
                   event->spans_index + span_num);

    if (!e_week_view_layout_get_span_position (event, span,
                           week_view->rows_per_cell,
                           week_view->rows_per_compressed_cell,
                           week_view->display_start_day,
                           week_view->multi_week_view,
                           week_view->compress_weekend,
                           &num_days)) {
        return FALSE;
    }

    e_week_view_get_day_position (week_view, span->start_day,
                      &start_x, &start_y, &start_w, &start_h);
    *span_y = start_y + week_view->events_y_offset
        + span->row * (week_view->row_height
                   + E_WEEK_VIEW_EVENT_Y_SPACING);
    if (num_days == 1) {
        *span_x = start_x;
        *span_w = start_w - 1;
    } else {
        e_week_view_get_day_position (week_view,
                          span->start_day + num_days - 1,
                          &end_x, &end_y, &end_w, &end_h);
        *span_x = start_x;
        *span_w = end_x + end_w - start_x - 1;
    }

    return TRUE;
}



static gboolean
e_week_view_on_button_press (GtkWidget *widget,
                 GdkEventButton *event,
                 EWeekView *week_view)
{
    gint x, y, day;

#if 0
    g_print ("In e_week_view_on_button_press\n");
#endif

    /* Handle scroll wheel events */
    if (event->button == 4 || event->button == 5) {
        GtkAdjustment *adj = GTK_RANGE (week_view->vscrollbar)->adjustment;
        gfloat new_value;

        new_value = adj->value + ((event->button == 4) ?
                      -adj->page_increment:
                      adj->page_increment);
        new_value = CLAMP (new_value, adj->lower, adj->upper - adj->page_size);
        gtk_adjustment_set_value (adj, new_value);

        return TRUE;
    }

    /* If an event is pressed just return. */
    if (week_view->pressed_event_num != -1)
        return FALSE;

    /* Convert the mouse position to a week & day. */
    x = event->x;
    y = event->y;
    day = e_week_view_convert_position_to_day (week_view, x, y);
    if (day == -1)
        return FALSE;

    /* Start the selection drag. */
    if (event->button == 1) {
        if (!GTK_WIDGET_HAS_FOCUS (week_view))
            gtk_widget_grab_focus (GTK_WIDGET (week_view));

        if (gdk_pointer_grab (GTK_LAYOUT (widget)->bin_window, FALSE,
                      GDK_POINTER_MOTION_MASK
                      | GDK_BUTTON_RELEASE_MASK,
                      FALSE, NULL, event->time) == 0) {
            week_view->selection_start_day = day;
            week_view->selection_end_day = day;
            week_view->selection_drag_pos = E_WEEK_VIEW_DRAG_END;

            /* FIXME: Optimise? */
            gtk_widget_queue_draw (week_view->main_canvas);
        }
    } else if (event->button == 3) {
        if (!GTK_WIDGET_HAS_FOCUS (week_view))
            gtk_widget_grab_focus (GTK_WIDGET (week_view));
        e_week_view_show_popup_menu (week_view, event, -1);
    }

    return FALSE;
}


static gboolean
e_week_view_on_button_release (GtkWidget *widget,
                   GdkEventButton *event,
                   EWeekView *week_view)
{
    time_t start, end;

#if 0
    g_print ("In e_week_view_on_button_release\n");
#endif

    if (week_view->selection_drag_pos != E_WEEK_VIEW_DRAG_NONE) {
        week_view->selection_drag_pos = E_WEEK_VIEW_DRAG_NONE;
        gdk_pointer_ungrab (event->time);
        start = week_view->day_starts[week_view->selection_start_day];
        end = week_view->day_starts[week_view->selection_end_day + 1];

        if (week_view->calendar)
            gnome_calendar_set_selected_time_range (week_view->calendar, start, end);
    }

    return FALSE;
}


static gboolean
e_week_view_on_motion (GtkWidget *widget,
               GdkEventMotion *mevent,
               EWeekView *week_view)
{
    gint x, y, day;

#if 0
    g_print ("In e_week_view_on_motion\n");
#endif

    /* Convert the mouse position to a week & day. */
    x = mevent->x;
    y = mevent->y;
    day = e_week_view_convert_position_to_day (week_view, x, y);
    if (day == -1)
        return FALSE;

    if (week_view->selection_drag_pos != E_WEEK_VIEW_DRAG_NONE) {
        e_week_view_update_selection (week_view, day);
        return TRUE;
    }

    return FALSE;
}


/* Converts a position in the canvas window to a day offset from the first
   day displayed. Returns -1 if the position is outside the grid. */
static gint
e_week_view_convert_position_to_day (EWeekView *week_view,
                     gint x,
                     gint y)
{
    gint col, row, grid_x = -1, grid_y = -1, week, day;
    gint weekend_col, box, weekend_box;

    /* First we convert it to a grid position. */
    for (col = 0; col <= week_view->columns; col++) {
        if (x < week_view->col_offsets[col]) {
            grid_x = col - 1;
            break;
        }
    }

    for (row = 0; row <= week_view->rows; row++) {
        if (y < week_view->row_offsets[row]) {
            grid_y = row - 1;
            break;
        }
    }

    /* If the mouse is outside the grid return FALSE. */
    if (grid_x == -1 || grid_y == -1)
        return -1;

    /* Now convert the grid position to a week and day. */
    if (week_view->multi_week_view) {
        week = grid_y / 2;
        day = grid_x;

        if (week_view->compress_weekend) {
            weekend_col = (5 + 7 - week_view->display_start_day) % 7;
            if (grid_x > weekend_col
                || (grid_x == weekend_col && grid_y % 2 == 1))
                day++;
        }
    } else {
        week = 0;

        box = grid_x * 3 + grid_y / 2;
        weekend_box = (5 + 7 - week_view->display_start_day) % 7;
        day = box;
        if (box > weekend_box
            ||( box == weekend_box && grid_y % 2 == 1))
            day++;
    }

    return week * 7 + day;
}


static void
e_week_view_update_selection (EWeekView *week_view,
                  gint day)
{
    gint tmp_day;
    gboolean need_redraw = FALSE;

#if 0
    g_print ("Updating selection %i,%i\n", week, day);
#endif

    if (week_view->selection_drag_pos == E_WEEK_VIEW_DRAG_START) {
        if (day != week_view->selection_start_day) {
            need_redraw = TRUE;
            week_view->selection_start_day = day;
        }
    } else {
        if (day != week_view->selection_end_day) {
            need_redraw = TRUE;
            week_view->selection_end_day = day;
        }
    }

    /* Switch the drag position if necessary. */
    if (week_view->selection_start_day > week_view->selection_end_day) {
        tmp_day = week_view->selection_start_day;
        week_view->selection_start_day = week_view->selection_end_day;
        week_view->selection_end_day = tmp_day;
        if (week_view->selection_drag_pos == E_WEEK_VIEW_DRAG_START)
            week_view->selection_drag_pos = E_WEEK_VIEW_DRAG_END;
        else
            week_view->selection_drag_pos = E_WEEK_VIEW_DRAG_START;
    }

    /* FIXME: Optimise? */
    if (need_redraw) {
        gtk_widget_queue_draw (week_view->main_canvas);
    }
}


static void
e_week_view_free_events (EWeekView *week_view)
{
    EWeekViewEvent *event;
    EWeekViewEventSpan *span;
    gint event_num, span_num, num_days, day;

    /* Reset all our indices. */
    week_view->pressed_event_num = -1;
    week_view->pressed_span_num = -1;
    week_view->editing_event_num = -1;
    week_view->editing_span_num = -1;
    week_view->popup_event_num = -1;

    for (event_num = 0; event_num < week_view->events->len; event_num++) {
        event = &g_array_index (week_view->events, EWeekViewEvent,
                    event_num);
        gtk_object_unref (GTK_OBJECT (event->comp));
    }

    g_array_set_size (week_view->events, 0);

    /* Destroy all the old canvas items. */
    if (week_view->spans) {
        for (span_num = 0; span_num < week_view->spans->len;
             span_num++) {
            span = &g_array_index (week_view->spans,
                           EWeekViewEventSpan, span_num);
            if (span->background_item)
                gtk_object_destroy (GTK_OBJECT (span->background_item));
            if (span->text_item)
                gtk_object_destroy (GTK_OBJECT (span->text_item));
        }
        g_array_free (week_view->spans, TRUE);
        week_view->spans = NULL;
    }

    /* Clear the number of rows used per day. */
    num_days = week_view->multi_week_view ? week_view->weeks_shown * 7 : 7;
    for (day = 0; day <= num_days; day++) {
        week_view->rows_per_day[day] = 0;
    }
}


/* This adds one event to the view, adding it to the appropriate array. */
static gboolean
e_week_view_add_event (CalComponent *comp,
               time_t     start,
               time_t     end,
               gpointer   data)

{
    EWeekView *week_view;
    EWeekViewEvent event;
    gint num_days;
    struct tm start_tm, end_tm;

    week_view = E_WEEK_VIEW (data);

    /* Check that the event times are valid. */
    num_days = week_view->multi_week_view ? week_view->weeks_shown * 7 : 7;

#if 0
    g_print ("View start:%li end:%li  Event start:%li end:%li\n",
         week_view->day_starts[0], week_view->day_starts[num_days],
         start, end);
#endif

    g_return_val_if_fail (start <= end, TRUE);
    g_return_val_if_fail (start < week_view->day_starts[num_days], TRUE);
    g_return_val_if_fail (end > week_view->day_starts[0], TRUE);

    start_tm = *(localtime (&start));
    end_tm = *(localtime (&end));

    event.comp = comp;
    gtk_object_ref (GTK_OBJECT (event.comp));
    event.start = start;
    event.end = end;
    event.spans_index = 0;
    event.num_spans = 0;

    event.start_minute = start_tm.tm_hour * 60 + start_tm.tm_min;
    event.end_minute = end_tm.tm_hour * 60 + end_tm.tm_min;
    if (event.end_minute == 0 && start != end)
        event.end_minute = 24 * 60;

    g_array_append_val (week_view->events, event);
    week_view->events_sorted = FALSE;
    week_view->events_need_layout = TRUE;

    return TRUE;
}


/* This lays out the events, or reshapes them, as necessary. */
static void
e_week_view_check_layout (EWeekView *week_view)
{
    /* Don't bother if we aren't visible. */
    if (!GTK_WIDGET_VISIBLE (week_view))
        return;

    /* Make sure the events are sorted (by start and size). */
    e_week_view_ensure_events_sorted (week_view);

    if (week_view->events_need_layout)
        week_view->spans = e_week_view_layout_events
            (week_view->events, week_view->spans,
             week_view->multi_week_view,
             week_view->weeks_shown,
             week_view->compress_weekend,
             week_view->display_start_day,
             week_view->day_starts,
             week_view->rows_per_day);

    if (week_view->events_need_layout || week_view->events_need_reshape)
        e_week_view_reshape_events (week_view);

    week_view->events_need_layout = FALSE;
    week_view->events_need_reshape = FALSE;
}


static void
e_week_view_ensure_events_sorted (EWeekView *week_view)
{
    if (!week_view->events_sorted) {
        qsort (week_view->events->data,
               week_view->events->len,
               sizeof (EWeekViewEvent),
               e_week_view_event_sort_func);
        week_view->events_sorted = TRUE;
    }
}


gint
e_week_view_event_sort_func (const void *arg1,
                 const void *arg2)
{
    EWeekViewEvent *event1, *event2;

    event1 = (EWeekViewEvent*) arg1;
    event2 = (EWeekViewEvent*) arg2;

    if (event1->start < event2->start)
        return -1;
    if (event1->start > event2->start)
        return 1;

    if (event1->end > event2->end)
        return -1;
    if (event1->end < event2->end)
        return 1;

    return 0;
}


static void
e_week_view_reshape_events (EWeekView *week_view)
{
    EWeekViewEvent *event;
    gint event_num, span_num;
    gint num_days, day, day_x, day_y, day_w, day_h, max_rows;
    gboolean is_weekend;

    for (event_num = 0; event_num < week_view->events->len; event_num++) {
        event = &g_array_index (week_view->events, EWeekViewEvent,
                    event_num);
        for (span_num = 0; span_num < event->num_spans; span_num++) {
            e_week_view_reshape_event_span (week_view, event_num,
                            span_num);
        }
    }

    /* Reshape the jump buttons and show/hide them as appropriate. */
    num_days = week_view->multi_week_view ? week_view->weeks_shown * 7 : 7;
    for (day = 0; day < num_days; day++) {

        is_weekend = ((week_view->display_start_day + day) % 7 >= 5) ? TRUE : FALSE;
        if (!is_weekend || (week_view->multi_week_view
                    && !week_view->compress_weekend))
            max_rows = week_view->rows_per_cell;
        else
            max_rows = week_view->rows_per_compressed_cell;

        /* Determine whether the jump button should be shown. */
        if (week_view->rows_per_day[day] <= max_rows) {
            gnome_canvas_item_hide (week_view->jump_buttons[day]);
        } else {
            e_week_view_get_day_position (week_view, day,
                              &day_x, &day_y,
                              &day_w, &day_h);

            gnome_canvas_item_set (week_view->jump_buttons[day],
                           "GnomeCanvasPixbuf::x", (gdouble) (day_x + day_w - E_WEEK_VIEW_JUMP_BUTTON_X_PAD - E_WEEK_VIEW_JUMP_BUTTON_WIDTH),
                           "GnomeCanvasPixbuf::y", (gdouble) (day_y + day_h - E_WEEK_VIEW_JUMP_BUTTON_Y_PAD - E_WEEK_VIEW_JUMP_BUTTON_HEIGHT),
                           NULL);

            gnome_canvas_item_show (week_view->jump_buttons[day]);
            gnome_canvas_item_raise_to_top (week_view->jump_buttons[day]);
        }
    }

    for (day = num_days; day < E_WEEK_VIEW_MAX_WEEKS * 7; day++) {
        gnome_canvas_item_hide (week_view->jump_buttons[day]);
    }
}


static void
e_week_view_reshape_event_span (EWeekView *week_view,
                gint event_num,
                gint span_num)
{
    EWeekViewEvent *event;
    EWeekViewEventSpan *span;
    GdkFont *font;
    gint span_x, span_y, span_w, num_icons, icons_width, time_width;
    gint min_text_x, max_text_w, width;
    gboolean show_icons = TRUE, use_max_width = FALSE;
    gboolean one_day_event;
    CalComponent *comp;
    gdouble text_x, text_y, text_w, text_h;
    gchar *text, *end_of_line;
    gint line_len, text_width;

    event = &g_array_index (week_view->events, EWeekViewEvent, event_num);
    span = &g_array_index (week_view->spans, EWeekViewEventSpan,
                   event->spans_index + span_num);
    comp = event->comp;
    font = GTK_WIDGET (week_view)->style->font;

    one_day_event = e_week_view_is_one_day_event (week_view, event_num);

    /* If the span will not be visible destroy the canvas items and
       return. */
    if (!e_week_view_get_span_position (week_view, event_num, span_num,
                        &span_x, &span_y, &span_w)) {
        if (span->background_item)
            gtk_object_destroy (GTK_OBJECT (span->background_item));
        if (span->text_item)
            gtk_object_destroy (GTK_OBJECT (span->text_item));
        span->background_item = NULL;
        span->text_item = NULL;
        return;
    }

    /* If we are editing a long event we don't show the icons and the EText
       item uses the maximum width available. */
    if (!one_day_event && week_view->editing_event_num == event_num
        && week_view->editing_span_num == span_num) {
        show_icons = FALSE;
        use_max_width = TRUE;
    }

    /* Calculate how many icons we need to show. */
    num_icons = 0;
    if (show_icons) {
        if (cal_component_has_alarms (comp))
            num_icons++;
        if (cal_component_has_recurrences (comp))
            num_icons++;
    }

    /* Create the background canvas item if necessary. */
    if (!span->background_item) {
        span->background_item =
            gnome_canvas_item_new (GNOME_CANVAS_GROUP (GNOME_CANVAS (week_view->main_canvas)->root),
                           e_week_view_event_item_get_type (),
                           NULL);
    }

    gnome_canvas_item_set (span->background_item,
                   "event_num", event_num,
                   "span_num", span_num,
                   NULL);

    /* Create the text item if necessary. */
    if (!span->text_item) {
        CalComponentText text;

        cal_component_get_summary (comp, &text);
        span->text_item =
            gnome_canvas_item_new (GNOME_CANVAS_GROUP (GNOME_CANVAS (week_view->main_canvas)->root),
                           e_text_get_type (),
                           "font_gdk", GTK_WIDGET (week_view)->style->font,
                           "anchor", GTK_ANCHOR_NW,
                           "clip", TRUE,
#if 0
                           "max_lines", 1,
#endif
                           "editable", TRUE,
                           "text", text.value ? text.value : "",
                           "use_ellipsis", TRUE,
                           "fill_color_rgba", GNOME_CANVAS_COLOR(0, 0, 0),
                           NULL);
        gtk_signal_connect (GTK_OBJECT (span->text_item), "event",
                    GTK_SIGNAL_FUNC (e_week_view_on_text_item_event),
                    week_view);
    }

    /* Calculate the position of the text item.
       For events < 1 day it starts after the times & icons and ends at the
       right edge of the span.
       For events >= 1 day we need to determine whether times are shown at
       the start and end of the span, then try to center the text item with
       the icons in the middle, but making sure we don't go over the times.
    */


    /* Calculate the space necessary to display a time, e.g. "13:00". */
    time_width = e_week_view_get_time_string_width (week_view);

    /* Calculate the space needed for the icons. */
    icons_width = (E_WEEK_VIEW_ICON_WIDTH + E_WEEK_VIEW_ICON_X_PAD)
        * num_icons - E_WEEK_VIEW_ICON_X_PAD + E_WEEK_VIEW_ICON_R_PAD;

    /* The y position and height are the same for both event types. */
    text_y = span_y + E_WEEK_VIEW_EVENT_BORDER_HEIGHT
        + E_WEEK_VIEW_EVENT_TEXT_Y_PAD;
    text_h = font->ascent + font->descent;

    if (one_day_event) {
        /* Note that 1-day events don't have a border. Although we
           still use the border height to position the events
           vertically so they still line up neatly (see above),
           we don't use the border width or edge padding at all. */
        text_x = span_x + E_WEEK_VIEW_EVENT_L_PAD;

        switch (week_view->time_format) {
        case E_WEEK_VIEW_TIME_BOTH_SMALL_MIN:
        case E_WEEK_VIEW_TIME_BOTH:
            /* These have 2 time strings with a small space between
               them and some space before the EText item. */
            text_x += time_width * 2
                + E_WEEK_VIEW_EVENT_TIME_SPACING
                + E_WEEK_VIEW_EVENT_TIME_X_PAD;
            break;
        case E_WEEK_VIEW_TIME_START_SMALL_MIN:
        case E_WEEK_VIEW_TIME_START:
            /* These have just 1 time string with some space
               before the EText item. */
            text_x += time_width + E_WEEK_VIEW_EVENT_TIME_X_PAD;
            break;
        case E_WEEK_VIEW_TIME_NONE:
            break;
        }

        /* The icons_width includes space on the right of the icons. */
        text_x += icons_width;

        /* The width of the EText item extends right to the edge of the
           event, just inside the border. */
        text_w = span_x + span_w - E_WEEK_VIEW_EVENT_R_PAD - text_x;

    } else {
        if (use_max_width) {
            /* When we are editing the event we use all the
               available width. */
            text_x = span_x + E_WEEK_VIEW_EVENT_L_PAD
                + E_WEEK_VIEW_EVENT_BORDER_WIDTH
                + E_WEEK_VIEW_EVENT_EDGE_X_PAD;
            text_w = span_x + span_w - E_WEEK_VIEW_EVENT_R_PAD
                - E_WEEK_VIEW_EVENT_BORDER_WIDTH
                - E_WEEK_VIEW_EVENT_EDGE_X_PAD - text_x;
        } else {
            /* Get the width of the text of the event. This is a
               bit of a hack. It would be better if EText could
               tell us this. */
            gtk_object_get (GTK_OBJECT (span->text_item),
                    "text", &text,
                    NULL);
            text_width = 0;
            if (text) {
                /* It should only have one line of text in it.
                   I'm not sure we need this any more. */
                end_of_line = strchr (text, '\n');
                if (end_of_line)
                    line_len = end_of_line - text;
                else
                    line_len = strlen (text);
                text_width = gdk_text_width (font, text,
                                 line_len);
                g_free (text);
            }

            /* Add on the width of the icons and find the default
               position, which centers the icons + text. */
            width = text_width + icons_width;
            text_x = span_x + (span_w - width) / 2;

            /* Now calculate the left-most valid position, and make
               sure we don't go to the left of that. */
            min_text_x = span_x + E_WEEK_VIEW_EVENT_L_PAD
                + E_WEEK_VIEW_EVENT_BORDER_WIDTH
                + E_WEEK_VIEW_EVENT_EDGE_X_PAD;
            /* See if we will want to display the start time, and
               if so take that into account. */
            if (event->start > week_view->day_starts[span->start_day])
                min_text_x += time_width
                    + E_WEEK_VIEW_EVENT_TIME_X_PAD;

            /* Now make sure we don't go to the left of the minimum
               position. */
            text_x = MAX (text_x, min_text_x);

            /* Now calculate the largest valid width, using the
               calculated x position, and make sure we don't
               exceed that. */
            max_text_w = span_x + span_w - E_WEEK_VIEW_EVENT_R_PAD
                - E_WEEK_VIEW_EVENT_BORDER_WIDTH
                - E_WEEK_VIEW_EVENT_EDGE_X_PAD - text_x;
            if (event->end < week_view->day_starts[span->start_day
                                  + span->num_days])
                max_text_w -= time_width
                    + E_WEEK_VIEW_EVENT_TIME_X_PAD;

            text_w = MIN (width, max_text_w);

            /* Now take out the space for the icons. */
            text_x += icons_width;
            text_w -= icons_width;
        }
    }

    /* Make sure we don't try to use a negative width. */
    text_w = MAX (text_w, 0);

    gnome_canvas_item_set (span->text_item,
                   "clip_width", (gdouble) text_w,
                   "clip_height", (gdouble) text_h,
                   NULL);
    e_canvas_item_move_absolute (span->text_item, text_x, text_y);
}


static void
e_week_view_on_adjustment_changed (GtkAdjustment *adjustment,
                   EWeekView *week_view)
{
    GDate date;
    gint week_offset;
    struct tm tm;
    time_t lower, start, end;
    guint32 old_first_day_julian, new_first_day_julian;

    /* If we don't have a valid date set yet, just return. */
    if (!g_date_valid (&week_view->first_day_shown))
        return;

    /* Determine the first date shown. */
    date = week_view->base_date;
    week_offset = floor (adjustment->value + 0.5);
    g_date_add_days (&date, week_offset * 7);

    /* Convert the old & new first days shown to julian values. */
    old_first_day_julian = g_date_julian (&week_view->first_day_shown);
    new_first_day_julian = g_date_julian (&date);

    /* If we are already showing the date, just return. */
    if (old_first_day_julian == new_first_day_julian)
        return;

    /* Set the new first day shown. */
    week_view->first_day_shown = date;

    /* Convert it to a time_t. */
    g_date_to_struct_tm (&date, &tm);
    lower = mktime (&tm);
    lower = time_day_begin (lower);

    e_week_view_recalc_day_starts (week_view, lower);
    update_query (week_view);

    /* Update the selection, if needed. */
    if (week_view->selection_start_day != -1) {
        start = week_view->day_starts[week_view->selection_start_day];
        end = week_view->day_starts[week_view->selection_end_day + 1];
        if (week_view->calendar)
            gnome_calendar_set_selected_time_range (week_view->calendar, start, end);
    }

    gtk_widget_queue_draw (week_view->main_canvas);
}


void
e_week_view_start_editing_event (EWeekView *week_view,
                 gint       event_num,
                 gint       span_num,
                 gchar     *initial_text)
{
    EWeekViewEvent *event;
    EWeekViewEventSpan *span;
    ETextEventProcessor *event_processor = NULL;
    ETextEventProcessorCommand command;

    /* If we are already editing the event, just return. */
    if (event_num == week_view->editing_event_num
        && span_num == week_view->editing_span_num)
        return;

    event = &g_array_index (week_view->events, EWeekViewEvent, event_num);
    span = &g_array_index (week_view->spans, EWeekViewEventSpan,
                   event->spans_index + span_num);

    /* If the event is not shown, don't try to edit it. */
    if (!span->text_item)
        return;

    if (initial_text) {
        gnome_canvas_item_set (span->text_item,
                       "text", initial_text,
                       NULL);
    }

    /* FIXME: This implicitly stops any edit of another item, causing it
       to be sent to the server and resulting in a call to obj_updated_cb()
       which may reload all the events and so our span and text item may
       actually be destroyed. So we often get a SEGV. */
    e_canvas_item_grab_focus (span->text_item, TRUE);

    /* Try to move the cursor to the end of the text. */
    gtk_object_get (GTK_OBJECT (span->text_item),
            "event_processor", &event_processor,
            NULL);
    if (event_processor) {
        command.action = E_TEP_MOVE;
        command.position = E_TEP_END_OF_BUFFER;
        gtk_signal_emit_by_name (GTK_OBJECT (event_processor),
                     "command", &command);
    }
}


/* This stops any current edit. */
void
e_week_view_stop_editing_event (EWeekView *week_view)
{
    GtkWidget *toplevel;

    /* Check we are editing an event. */
    if (week_view->editing_event_num == -1)
        return;

    /* Set focus to the toplevel so the item loses focus. */
    toplevel = gtk_widget_get_toplevel (GTK_WIDGET (week_view));
    if (toplevel && GTK_IS_WINDOW (toplevel))
        gtk_window_set_focus (GTK_WINDOW (toplevel), NULL);
}


static gboolean
e_week_view_on_text_item_event (GnomeCanvasItem *item,
                GdkEvent *event,
                EWeekView *week_view)
{
    gint event_num, span_num;

#if 0
    g_print ("In e_week_view_on_text_item_event\n");
#endif

    switch (event->type) {
    case GDK_KEY_PRESS:
        if (event && event->key.keyval == GDK_Return) {
            /* We set the keyboard focus to the EDayView, so the
               EText item loses it and stops the edit. */
            gtk_widget_grab_focus (GTK_WIDGET (week_view));

            /* Stop the signal last or we will also stop any
               other events getting to the EText item. */
            gtk_signal_emit_stop_by_name (GTK_OBJECT (item),
                              "event");
            return TRUE;
        }
        break;
    case GDK_BUTTON_PRESS:
        if (!e_week_view_find_event_from_item (week_view, item,
                               &event_num, &span_num))
            return FALSE;

        if (event->button.button == 3) {
            if (!GTK_WIDGET_HAS_FOCUS (week_view))
                gtk_widget_grab_focus (GTK_WIDGET (week_view));
            e_week_view_show_popup_menu (week_view,
                             (GdkEventButton*) event,
                             event_num);
            gtk_signal_emit_stop_by_name (GTK_OBJECT (item->canvas),
                              "button_press_event");
            return TRUE;
        }

        week_view->pressed_event_num = event_num;
        week_view->pressed_span_num = span_num;

        /* Only let the EText handle the event while editing. */
        if (!E_TEXT (item)->editing) {
            gtk_signal_emit_stop_by_name (GTK_OBJECT (item),
                              "event");

            if (event) {
                week_view->drag_event_x = event->button.x;
                week_view->drag_event_y = event->button.y;
            } else
                g_warning ("No GdkEvent");

            /* FIXME: Remember the day offset from the start of
               the event, for DnD. */

            return TRUE;
        }
        break;
    case GDK_BUTTON_RELEASE:
        if (!E_TEXT (item)->editing) {
            /* This shouldn't ever happen. */
            if (!e_week_view_find_event_from_item (week_view,
                                   item,
                                   &event_num,
                                   &span_num))
                return FALSE;

            if (week_view->pressed_event_num != -1
                && week_view->pressed_event_num == event_num
                && week_view->pressed_span_num == span_num) {
                e_week_view_start_editing_event (week_view,
                                 event_num,
                                 span_num,
                                 NULL);
                week_view->pressed_event_num = -1;
            }

            /* Stop the signal last or we will also stop any
               other events getting to the EText item. */
            gtk_signal_emit_stop_by_name (GTK_OBJECT (item),
                              "event");
            return TRUE;
        }
        week_view->pressed_event_num = -1;
        break;
    case GDK_FOCUS_CHANGE:
        if (event->focus_change.in) {
            e_week_view_on_editing_started (week_view, item);
        } else {
            e_week_view_on_editing_stopped (week_view, item);
        }

        return FALSE;
    default:
        break;
    }

    return FALSE;
}


static void
e_week_view_on_editing_started (EWeekView *week_view,
                GnomeCanvasItem *item)
{
    gint event_num, span_num;

    if (!e_week_view_find_event_from_item (week_view, item,
                           &event_num, &span_num))
        return;

#if 0
    g_print ("In e_week_view_on_editing_started event_num:%i span_num:%i\n", event_num, span_num);
#endif

    week_view->editing_event_num = event_num;
    week_view->editing_span_num = span_num;

    /* We need to reshape long events so the whole width is used while
       editing. */
    if (!e_week_view_is_one_day_event (week_view, event_num)) {
        e_week_view_reshape_event_span (week_view, event_num,
                        span_num);
    }
}


static void
e_week_view_on_editing_stopped (EWeekView *week_view,
                GnomeCanvasItem *item)
{
    gint event_num, span_num;
    EWeekViewEvent *event;
    EWeekViewEventSpan *span;
    gchar *text = NULL;
    CalComponentText summary;
    const char *uid;

    /* Note: the item we are passed here isn't reliable, so we just stop
       the edit of whatever item was being edited. We also receive this
       event twice for some reason. */
    event_num = week_view->editing_event_num;
    span_num = week_view->editing_span_num;

    /* If no item is being edited, just return. */
    if (event_num == -1)
        return;

    event = &g_array_index (week_view->events, EWeekViewEvent, event_num);
    span = &g_array_index (week_view->spans, EWeekViewEventSpan,
                   event->spans_index + span_num);

    /* Reset the edit fields. */
    week_view->editing_event_num = -1;

    /* Check that the event is still valid. */
    cal_component_get_uid (event->comp, &uid);
    if (!uid)
        return;

    gtk_object_get (GTK_OBJECT (span->text_item),
            "text", &text,
            NULL);

    /* Only update the summary if necessary. */
    cal_component_get_summary (event->comp, &summary);
    if (text && summary.value && !strcmp (text, summary.value)) {
        g_free (text);
        if (!e_week_view_is_one_day_event (week_view, event_num))
            e_week_view_reshape_event_span (week_view, event_num,
                            span_num);
        return;
    }

    summary.value = text;
    cal_component_set_summary (event->comp, &summary);
    g_free (text);

    if (!cal_client_update_object (week_view->client, event->comp))
        g_message ("e_week_view_on_editing_stopped(): Could not update the object!");
}


static gboolean
e_week_view_find_event_from_item (EWeekView   *week_view,
                  GnomeCanvasItem *item,
                  gint        *event_num_return,
                  gint        *span_num_return)
{
    EWeekViewEvent *event;
    EWeekViewEventSpan *span;
    gint event_num, span_num, num_events;

    num_events = week_view->events->len;
    for (event_num = 0; event_num < num_events; event_num++) {
        event = &g_array_index (week_view->events, EWeekViewEvent,
                    event_num);
        for (span_num = 0; span_num < event->num_spans; span_num++) {
            span = &g_array_index (week_view->spans,
                           EWeekViewEventSpan,
                           event->spans_index + span_num);
            if (span->text_item == item) {
                *event_num_return = event_num;
                *span_num_return = span_num;
                return TRUE;
            }
        }
    }

    return FALSE;
}


/* Finds the index of the event with the given uid.
   Returns TRUE if an event with the uid was found.
   Note that for recurring events there may be several EWeekViewEvents, one
   for each instance, all with the same iCalObject and uid. So only use this
   function if you know the event doesn't recur or you are just checking to
   see if any events with the uid exist. */
static gboolean
e_week_view_find_event_from_uid (EWeekView    *week_view,
                 const gchar      *uid,
                 gint         *event_num_return)
{
    EWeekViewEvent *event;
    gint event_num, num_events;

    num_events = week_view->events->len;
    for (event_num = 0; event_num < num_events; event_num++) {
        const char *u;

        event = &g_array_index (week_view->events, EWeekViewEvent,
                    event_num);

        cal_component_get_uid (event->comp, &u);
        if (u && !strcmp (uid, u)) {
            *event_num_return = event_num;
            return TRUE;
        }
    }

    return FALSE;
}


gboolean
e_week_view_is_one_day_event    (EWeekView  *week_view,
                 gint        event_num)
{
    EWeekViewEvent *event;
    EWeekViewEventSpan *span;

    event = &g_array_index (week_view->events, EWeekViewEvent, event_num);
    if (event->num_spans != 1)
        return FALSE;

    span = &g_array_index (week_view->spans, EWeekViewEventSpan,
                   event->spans_index);

    if (event->start == week_view->day_starts[span->start_day]
        && event->end == week_view->day_starts[span->start_day + 1])
        return FALSE;

    if (span->num_days == 1
        && event->start >= week_view->day_starts[span->start_day]
        && event->end <= week_view->day_starts[span->start_day + 1])
        return TRUE;

    return FALSE;
}


static gint
e_week_view_key_press (GtkWidget *widget, GdkEventKey *event)
{
    EWeekView *week_view;
    CalComponent *comp;
    gint event_num;
    gchar *initial_text;
    CalComponentDateTime date;
    struct icaltimetype itt;
    time_t dtstart, dtend;
    const char *uid;

    g_return_val_if_fail (widget != NULL, FALSE);
    g_return_val_if_fail (E_IS_WEEK_VIEW (widget), FALSE);
    g_return_val_if_fail (event != NULL, FALSE);

    week_view = E_WEEK_VIEW (widget);

    /* The Escape key aborts a resize operation. */
#if 0
    if (week_view->resize_drag_pos != E_WEEK_VIEW_POS_NONE) {
        if (event->keyval == GDK_Escape) {
            e_week_view_abort_resize (week_view, event->time);
        }
        return FALSE;
    }
#endif

    if (week_view->selection_start_day == -1)
        return FALSE;

    /* We only want to start an edit with a return key or a simple
       character. */
    if (event->keyval == GDK_Return) {
        initial_text = NULL;
    } else if ((event->keyval < 0x20)
           || (event->keyval > 0xFF)
           || (event->length == 0)
           || (event->state & (GDK_CONTROL_MASK | GDK_MOD1_MASK))) {
        return FALSE;
    } else {
        initial_text = event->string;
    }

    /* Add a new event covering the selected range. */
    comp = cal_component_new ();
    cal_component_set_new_vtype (comp, CAL_COMPONENT_EVENT);
    dtstart = week_view->day_starts[week_view->selection_start_day];
    dtend = week_view->day_starts[week_view->selection_end_day + 1];

    date.value = &itt;
    date.tzid = NULL;

    *date.value = icaltime_from_timet (dtstart, FALSE);
    cal_component_set_dtstart (comp, &date);
    *date.value = icaltime_from_timet (dtend, FALSE);
    cal_component_set_dtend (comp, &date);

    /* We add the event locally and start editing it. We don't send the
       new event to the server until the edit is finished.
       FIXME: If we get an obj-updated or obj-removed signal while editing
       the event, and we have to do a re-layout, we may lose this new
       event. */
    e_week_view_add_event (comp, dtstart, dtend, week_view);
    e_week_view_check_layout (week_view);
    gtk_widget_queue_draw (week_view->main_canvas);

    cal_component_get_uid (comp, &uid);
    if (e_week_view_find_event_from_uid (week_view, uid, &event_num)) {
        e_week_view_start_editing_event (week_view, event_num, 0,
                         initial_text);
    } else {
        g_warning ("Couldn't find event to start editing.\n");
    }

    gtk_object_unref (GTK_OBJECT (comp));

    return TRUE;
}

enum {
    /*
     * This is used to "flag" events that can not be editted
     */
    MASK_EDITABLE = 1,

    /*
     * To disable recurring actions to be displayed
     */
    MASK_RECURRING = 2,

    /*
     * To disable actions for non-recurring items to be displayed
     */
    MASK_SINGLE   = 4,

    /*
     * This is used to when an event is currently being edited
     * in another window and we want to disable the event
     * from being edited twice
     */
    MASK_EDITING  = 8
};

static EPopupMenu main_items [] = {
    { N_("Paste"), NULL,
      e_week_view_on_paste, NULL, 0 },

    { "", NULL, NULL, NULL, 0 },

    { N_("New Appointment..."), NULL,
      e_week_view_on_new_appointment, NULL, 0 },
    { N_("New All Day Event"), NULL,
      e_week_view_on_new_event, NULL, 0 },

    { "", NULL, NULL, NULL, 0 },

    { N_("Go to Today"), NULL,
      e_week_view_on_goto_today, NULL, 0 },
    { N_("Go to Date..."), NULL,
      e_week_view_on_goto_date, NULL, 0 },
    { NULL, NULL, NULL, NULL, 0 }
};

static EPopupMenu child_items [] = {
    { N_("Open"), NULL,
      e_week_view_on_edit_appointment, NULL, MASK_EDITABLE | MASK_EDITING },
    { N_("Delete this Appointment"), NULL,
      e_week_view_on_delete_appointment, NULL, MASK_EDITABLE | MASK_SINGLE | MASK_EDITING },
    { N_("Cut"), NULL,
      e_week_view_on_cut, NULL, MASK_EDITING | MASK_EDITABLE },
    { N_("Copy"), NULL,
      e_week_view_on_copy, NULL, MASK_EDITING | MASK_EDITABLE },
    { N_("Paste"), NULL,
      e_week_view_on_paste, NULL, 0 },
    { N_("Schedule Meeting"), NULL,
      e_week_view_on_schedule_meet, NULL, MASK_EDITING },
    { "", NULL, NULL, NULL, 0},

    { N_("New Appointment..."), NULL,
      e_week_view_on_new_appointment, NULL, 0 },

    { "", NULL, NULL, NULL, MASK_SINGLE },

    /*
     * The following are only shown if this is a recurring event
     */
    { "", NULL, NULL, NULL, MASK_SINGLE},
    { N_("Make this Occurrence Movable"), NULL,
      e_week_view_on_unrecur_appointment, NULL, MASK_RECURRING | MASK_EDITING },
    { N_("Delete this Occurrence"), NULL,
      e_week_view_on_delete_occurrence, NULL, MASK_RECURRING | MASK_EDITING },
    { N_("Delete All Occurrences"), NULL,
      e_week_view_on_delete_appointment, NULL, MASK_RECURRING | MASK_EDITING },
    
    { NULL, NULL, NULL, NULL, 0 }
};

void
e_week_view_show_popup_menu (EWeekView       *week_view,
                 GdkEventButton  *bevent,
                 gint         event_num)
{
    EWeekViewEvent *event;
    int have_selection;
    gboolean being_edited;
    guint32 disable_mask = 0, hide_mask = 0;
    EPopupMenu *context_menu;

    have_selection = GTK_WIDGET_HAS_FOCUS (week_view)
        && week_view->selection_start_day != -1;

    /*
     * This used to be set only if the event wasn't being edited
     * in the event editor, but we can't check that at present.
     * We could possibly set up another method of checking it.
     */
    being_edited = FALSE;
    
    if (event_num == -1) {
        context_menu = main_items;
    } else {
        context_menu = child_items;
        event = &g_array_index (week_view->events,
                    EWeekViewEvent, event_num);
        if (cal_component_has_recurrences (event->comp)) 
            hide_mask |= MASK_SINGLE;
        else
            hide_mask |= MASK_RECURRING;
    }

    if (being_edited)
        disable_mask |= MASK_EDITING;
    week_view->popup_event_num = event_num;

    e_popup_menu_run (context_menu, (GdkEvent *) bevent, disable_mask, hide_mask, week_view);
}

static void
e_week_view_on_new_appointment (GtkWidget *widget, gpointer data)
{
    EWeekView *week_view = E_WEEK_VIEW (data);
    time_t dtstart, dtend;
    
    dtstart = week_view->day_starts[week_view->selection_start_day];
    dtend = week_view->day_starts[week_view->selection_end_day + 1];
    gnome_calendar_new_appointment_for (
        week_view->calendar, dtstart, dtend, FALSE);
}

static void
e_week_view_on_new_event (GtkWidget *widget, gpointer data)
{
    EWeekView *week_view = E_WEEK_VIEW (data);
    time_t dtstart, dtend;
    
    dtstart = week_view->day_starts[week_view->selection_start_day];
    dtend = week_view->day_starts[week_view->selection_end_day + 1];
    gnome_calendar_new_appointment_for (
        week_view->calendar, dtstart, dtend, TRUE);
}

static void
e_week_view_on_goto_date (GtkWidget *widget, gpointer data)
{
    EWeekView *week_view = E_WEEK_VIEW (data);

    goto_dialog (week_view->calendar);
}

static void
e_week_view_on_goto_today (GtkWidget *widget, gpointer data)
{
    EWeekView *week_view = E_WEEK_VIEW (data);

    calendar_goto_today (week_view->calendar);
}

static void
e_week_view_on_edit_appointment (GtkWidget *widget, gpointer data)
{
    EWeekView *week_view;
    EWeekViewEvent *event;

    week_view = E_WEEK_VIEW (data);

    if (week_view->popup_event_num == -1)
        return;

    event = &g_array_index (week_view->events, EWeekViewEvent,
                week_view->popup_event_num);

    if (week_view->calendar)
        gnome_calendar_edit_object (week_view->calendar, event->comp);
    else
        g_warning ("Calendar not set");
}


static void
e_week_view_on_delete_occurrence (GtkWidget *widget, gpointer data)
{
    EWeekView *week_view;
    EWeekViewEvent *event;
    CalComponent *comp;

    week_view = E_WEEK_VIEW (data);

    if (week_view->popup_event_num == -1)
        return;

    event = &g_array_index (week_view->events, EWeekViewEvent,
                week_view->popup_event_num);

    /* We must duplicate the CalComponent, or we won't know it has changed
       when we get the "update_event" callback. */

    comp = cal_component_clone (event->comp);
    cal_comp_util_add_exdate (comp, icaltime_from_timet (event->start, TRUE));

    if (!cal_client_update_object (week_view->client, comp))
        g_message ("e_week_view_on_delete_occurrence(): Could not update the object!");

    gtk_object_unref (GTK_OBJECT (comp));
}


static void
e_week_view_on_delete_appointment (GtkWidget *widget, gpointer data)
{
    EWeekView *week_view;
    EWeekViewEvent *event;
    CalComponentVType vtype;

    week_view = E_WEEK_VIEW (data);

    if (week_view->popup_event_num == -1)
        return;

    event = &g_array_index (week_view->events, EWeekViewEvent,
                week_view->popup_event_num);

    vtype = cal_component_get_vtype (event->comp);

    if (delete_component_dialog (event->comp, 1, vtype, widget)) {
        const char *uid;

        cal_component_get_uid (event->comp, &uid);

        /* We don't check the return value; FALSE can mean the object
         * was not in the server anyways.
         */
        cal_client_remove_object (week_view->client, uid);
    }
}

static void
e_week_view_on_cut (GtkWidget *widget, gpointer data)
{
    EWeekView *week_view;
    EWeekViewEvent *event;
    const char *uid;

    week_view = E_WEEK_VIEW (data);

    e_week_view_on_copy (widget, data);

    if (week_view->popup_event_num == -1)
        return;

    event = &g_array_index (week_view->events, EWeekViewEvent,
                week_view->popup_event_num);

    cal_component_get_uid (event->comp, &uid);
    cal_client_remove_object (week_view->client, uid);
}

static void
e_week_view_on_copy (GtkWidget *widget, gpointer data)
{
    EWeekView *week_view;
    EWeekViewEvent *event;
    char *comp_str;

    week_view = E_WEEK_VIEW (data);

    if (week_view->popup_event_num == -1)
        return;

    event = &g_array_index (week_view->events, EWeekViewEvent,
                week_view->popup_event_num);

    comp_str = cal_component_get_as_string (event->comp);
    if (week_view->clipboard_selection)
        g_free (week_view->clipboard_selection);
    week_view->clipboard_selection = comp_str;

    gtk_selection_owner_set (week_view->invisible, clipboard_atom, GDK_CURRENT_TIME);
}

static void
e_week_view_on_paste (GtkWidget *widget, gpointer data)
{
    EWeekView *week_view = E_WEEK_VIEW (data);

    gtk_selection_convert (week_view->invisible,
                   clipboard_atom,
                   GDK_SELECTION_TYPE_STRING,
                   GDK_CURRENT_TIME);
}

static void
e_week_view_on_schedule_meet (GtkWidget *widget, gpointer data)
{
    EWeekView *week_view;
    EWeekViewEvent *event;
    EMeetingEditor *editor;
    
    week_view = E_WEEK_VIEW (data);

    if (week_view->popup_event_num == -1)
        return;

    event = &g_array_index (week_view->events, EWeekViewEvent,
                week_view->popup_event_num);

    editor = e_meeting_editor_new (event->comp, week_view->client);

    e_meeting_edit (editor);
    e_meeting_editor_free (editor);
}

static void
e_week_view_on_unrecur_appointment (GtkWidget *widget, gpointer data)
{
    EWeekView *week_view;
    EWeekViewEvent *event;
    CalComponent *comp, *new_comp;
    CalComponentDateTime date;
    struct icaltimetype itt;

    week_view = E_WEEK_VIEW (data);

    if (week_view->popup_event_num == -1)
        return;

    event = &g_array_index (week_view->events, EWeekViewEvent,
                week_view->popup_event_num);

    /* For the recurring object, we add a exception to get rid of the
       instance. */
    comp = cal_component_clone (event->comp);
    cal_comp_util_add_exdate (comp, icaltime_from_timet (event->start, TRUE));

    /* For the unrecurred instance we duplicate the original object,
       create a new uid for it, get rid of the recurrence rules, and set
       the start & end times to the instances times. */
    new_comp = cal_component_clone (event->comp);
    cal_component_set_uid (new_comp, cal_component_gen_uid ());
    cal_component_set_rdate_list (new_comp, NULL);
    cal_component_set_rrule_list (new_comp, NULL);
    cal_component_set_exdate_list (new_comp, NULL);
    cal_component_set_exrule_list (new_comp, NULL);

    date.value = &itt;
    date.tzid = NULL;

    *date.value = icaltime_from_timet (event->start, TRUE);
    cal_component_set_dtstart (new_comp, &date);
    *date.value = icaltime_from_timet (event->end, TRUE);
    cal_component_set_dtend (new_comp, &date);

    /* Now update both CalComponents. Note that we do this last since at
       present the updates happen synchronously so our event may disappear.
    */
    if (!cal_client_update_object (week_view->client, comp))
        g_message ("e_week_view_on_unrecur_appointment(): Could not update the object!");

    gtk_object_unref (GTK_OBJECT (comp));

    if (!cal_client_update_object (week_view->client, new_comp))
        g_message ("e_week_view_on_unrecur_appointment(): Could not update the object!");

    gtk_object_unref (GTK_OBJECT (new_comp));
}


static gboolean
e_week_view_on_jump_button_event (GnomeCanvasItem *item,
                  GdkEvent *event,
                  EWeekView *week_view)
{
    gint day;

    if (event->type == GDK_BUTTON_PRESS) {
        for (day = 0; day < E_WEEK_VIEW_MAX_WEEKS * 7; day++) {
            if (item == week_view->jump_buttons[day]) {
                if (week_view->calendar)
                    gnome_calendar_dayjump
                        (week_view->calendar,
                         week_view->day_starts[day]);
                else
                    g_warning ("Calendar not set");
                return TRUE;
            }
        }

    }

    return FALSE;
}


/* Converts an hour from 0-23 to the preferred time format, and returns the
   suffix to add and the width of it in the normal font. */
void
e_week_view_convert_time_to_display (EWeekView  *week_view,
                     gint        hour,
                     gint       *display_hour,
                     gchar         **suffix,
                     gint       *suffix_width)
{
    /* Calculate the actual hour number to display. For 12-hour
       format we convert 0-23 to 12-11am/12-11pm. */
    *display_hour = hour;
    if (week_view->use_24_hour_format) {
        *suffix = "";
        *suffix_width = 0;
    } else {
        if (hour < 12) {
            *suffix = week_view->am_string;
            *suffix_width = week_view->am_string_width;
        } else {
            *display_hour -= 12;
            *suffix = week_view->pm_string;
            *suffix_width = week_view->pm_string_width;
        }

        /* 12-hour uses 12:00 rather than 0:00. */
        if (*display_hour == 0)
            *display_hour = 12;
    }
}


gint
e_week_view_get_time_string_width   (EWeekView  *week_view)
{
    gint time_width;

    if (week_view->use_small_font && week_view->small_font)
        time_width = week_view->digit_width * 2
            + week_view->small_digit_width * 2;
    else
        time_width = week_view->digit_width * 4
            + week_view->colon_width;

    if (!week_view->use_24_hour_format)
        time_width += MAX (week_view->am_string_width,
                   week_view->pm_string_width);

    return time_width;
}

static void
invisible_destroyed (GtkWidget *invisible, EWeekView *week_view)
{
    week_view->invisible = NULL;
}

static void
selection_get (GtkWidget *invisible,
           GtkSelectionData *selection_data,
           guint info,
           guint time_stamp,
           EWeekView *week_view)
{
    if (week_view->clipboard_selection != NULL) {
        gtk_selection_data_set (selection_data,
                    GDK_SELECTION_TYPE_STRING,
                    8,
                    week_view->clipboard_selection,
                    strlen (week_view->clipboard_selection));
    }
}

static void
selection_clear_event (GtkWidget *invisible,
               GdkEventSelection *event,
               EWeekView *week_view)
{
    if (week_view->clipboard_selection != NULL) {
        g_free (week_view->clipboard_selection);
        week_view->clipboard_selection = NULL;
    }
}

static void
selection_received (GtkWidget *invisible,
            GtkSelectionData *selection_data,
            guint time,
            EWeekView *week_view)
{
    char *comp_str;
    icalcomponent *icalcomp;
    time_t dtstart, dtend;
    struct icaltimetype itime;
    CalComponent *comp;
    char *uid;

    g_return_if_fail (E_IS_WEEK_VIEW (week_view));

    if (selection_data->length < 0 ||
        selection_data->type != GDK_SELECTION_TYPE_STRING) {
        return;
    }

    comp_str = (char *) selection_data->data;
    icalcomp = icalparser_parse_string ((const char *) comp_str);
    if (icalcomp) {
        dtstart = week_view->day_starts[week_view->selection_start_day];
        itime = icaltime_from_timet (dtstart, FALSE);
        icalcomponent_set_dtstart (icalcomp, itime);

        dtend = week_view->day_starts[week_view->selection_end_day + 1];
        itime = icaltime_from_timet (dtend, FALSE);
        icalcomponent_set_dtend (icalcomp, itime);

        comp = cal_component_new ();
        cal_component_set_icalcomponent (comp, icalcomp);
        uid = cal_component_gen_uid ();
        cal_component_set_uid (comp, (const char *) uid);
        free (uid);

        cal_client_update_object (week_view->client, comp);

        gtk_object_unref (GTK_OBJECT (comp));
    }
}