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

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

/* 
 * Author : 
 *  Damon Chaplin <damon@ximian.com>
 *
 * Copyright 1999, Ximian, Inc.
 *
 * This program is free software; you can redistribute it and/or 
 * modify it under the terms of version 2 of the GNU General Public 
 * License as published by the Free Software Foundation.
 *
 * 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
 */

/*
 * EWeekViewTitlesItem - displays the 'Monday', 'Tuesday' etc. at the top of
 * the Month calendar view.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>
#include "e-week-view-titles-item.h"

static void e_week_view_titles_item_set_arg (GtkObject   *o,
                         GtkArg      *arg,
                         guint        arg_id);
static void e_week_view_titles_item_update  (GnomeCanvasItem *item,
                         double      *affine,
                         ArtSVP      *clip_path,
                         int          flags);
static void e_week_view_titles_item_draw    (GnomeCanvasItem *item,
                         GdkDrawable     *drawable,
                         int          x,
                         int          y,
                         int          width,
                         int          height);
static double e_week_view_titles_item_point (GnomeCanvasItem *item,
                         double       x,
                         double       y,
                         int          cx,
                         int          cy,
                         GnomeCanvasItem **actual_item);

/* The arguments we take */
enum {
    ARG_0,
    ARG_WEEK_VIEW
};

G_DEFINE_TYPE (EWeekViewTitlesItem, e_week_view_titles_item, GNOME_TYPE_CANVAS_ITEM);

static void
e_week_view_titles_item_class_init (EWeekViewTitlesItemClass *class)
{
    GtkObjectClass  *object_class;
    GnomeCanvasItemClass *item_class;

    object_class = (GtkObjectClass *) class;
    item_class = (GnomeCanvasItemClass *) class;

    gtk_object_add_arg_type ("EWeekViewTitlesItem::week_view",
                 GTK_TYPE_POINTER, GTK_ARG_WRITABLE,
                 ARG_WEEK_VIEW);

    object_class->set_arg = e_week_view_titles_item_set_arg;

    /* GnomeCanvasItem method overrides */
    item_class->update      = e_week_view_titles_item_update;
    item_class->draw        = e_week_view_titles_item_draw;
    item_class->point       = e_week_view_titles_item_point;
}


static void
e_week_view_titles_item_init (EWeekViewTitlesItem *wvtitem)
{
    wvtitem->week_view = NULL;
}


static void
e_week_view_titles_item_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    GnomeCanvasItem *item;
    EWeekViewTitlesItem *wvtitem;

    item = GNOME_CANVAS_ITEM (o);
    wvtitem = E_WEEK_VIEW_TITLES_ITEM (o);
    
    switch (arg_id){
    case ARG_WEEK_VIEW:
        wvtitem->week_view = GTK_VALUE_POINTER (*arg);
        break;
    }
}


static void
e_week_view_titles_item_update (GnomeCanvasItem *item,
                double      *affine,
                ArtSVP      *clip_path,
                int          flags)
{
    if (GNOME_CANVAS_ITEM_CLASS (e_week_view_titles_item_parent_class)->update)
        (* GNOME_CANVAS_ITEM_CLASS (e_week_view_titles_item_parent_class)->update) (item, affine, clip_path, flags);

    /* The item covers the entire canvas area. */
    item->x1 = 0;
    item->y1 = 0;
    item->x2 = INT_MAX;
    item->y2 = INT_MAX;
}


/*
 * DRAWING ROUTINES - functions to paint the canvas item.
 */

static void
e_week_view_titles_item_draw (GnomeCanvasItem  *canvas_item,
                  GdkDrawable      *drawable,
                  int       x,
                  int       y,
                  int       width,
                  int       height)
{
    EWeekViewTitlesItem *wvtitem;
    EWeekView *week_view;
    GtkStyle *style;
    GdkGC *fg_gc, *bg_gc, *light_gc, *dark_gc;
    gint canvas_width, canvas_height, col_width, col, date_width, date_x;
    gchar buffer[128], *date_format;
    GDate date;
    GdkRectangle clip_rect;
    gboolean long_format;
    gint weekday;
    PangoLayout *layout;

#if 0
    g_print ("In e_week_view_titles_item_draw %i,%i %ix%i\n",
         x, y, width, height);
#endif

    wvtitem = E_WEEK_VIEW_TITLES_ITEM (canvas_item);
    week_view = wvtitem->week_view;
    g_return_if_fail (week_view != NULL);

    style = gtk_widget_get_style (GTK_WIDGET (week_view));
    fg_gc = style->fg_gc[GTK_STATE_NORMAL];
    bg_gc = style->bg_gc[GTK_STATE_NORMAL];
    light_gc = style->light_gc[GTK_STATE_NORMAL];
    dark_gc = style->dark_gc[GTK_STATE_NORMAL];
    canvas_width = GTK_WIDGET (canvas_item->canvas)->allocation.width;
    canvas_height = GTK_WIDGET (canvas_item->canvas)->allocation.height;
    layout = gtk_widget_create_pango_layout (GTK_WIDGET (week_view), NULL);

    /* Draw the shadow around the dates. */
    gdk_draw_line (drawable, light_gc,
               1 - x, 1 - y,
               canvas_width - 2 - x, 1 - y);
    gdk_draw_line (drawable, light_gc,
               1 - x, 2 - y,
               1 - x, canvas_height - 1 - y);

    gdk_draw_rectangle (drawable, dark_gc, FALSE,
                0 - x, 0 - y,
                canvas_width - 1, canvas_height);

    /* Determine the format to use. */
    col_width = canvas_width / week_view->columns;
    if (col_width > week_view->max_day_width + 2) {
      date_format = "%A";
      long_format = TRUE;
    } else {
      date_format = "%a";
      long_format = FALSE;
    }

    /* Shift right one pixel to account for the shadow around the main
       canvas. */
    x--;

    /* Draw the date. Set a clipping rectangle so we don't draw over the
       next day. */
    g_date_clear (&date, 1);
    /* Note that 20th March 2000 is a Monday. We only care about the
       weekday. */
    weekday = week_view->display_start_day;
    g_date_set_dmy (&date, 20 + weekday, 3, 2000);
    for (col = 0; col < week_view->columns; col++) {
        if (weekday == 5 && week_view->compress_weekend) {
            g_date_strftime (buffer, 128, "%a/", &date);
            g_date_add_days (&date, 1);
            g_date_strftime (buffer + strlen (buffer), 100,
                     "%a", &date);
        } else {
            g_date_strftime (buffer, 128, date_format, &date);
        }

        clip_rect.x = week_view->col_offsets[col] - x;
        clip_rect.y = 2 - y;
        clip_rect.width = week_view->col_widths[col];
        clip_rect.height = canvas_height - 2;
        gdk_gc_set_clip_rectangle (fg_gc, &clip_rect);

        if (weekday == 5 && week_view->compress_weekend)
            date_width = week_view->abbr_day_widths[5]
                + week_view->slash_width
                + week_view->abbr_day_widths[6];
        else if (long_format)
            date_width = week_view->day_widths[weekday];
        else
            date_width = week_view->abbr_day_widths[weekday];

        date_x = week_view->col_offsets[col]
            + (week_view->col_widths[col] - date_width) / 2;
        date_x = MAX (date_x, week_view->col_offsets[col]);

        pango_layout_set_text (layout, buffer, -1);
        gdk_draw_layout (drawable, fg_gc,
                 date_x - x,
                 3 - y,
                 layout);

        gdk_gc_set_clip_rectangle (fg_gc, NULL);

        /* Draw the lines down the left and right of the date cols. */
        if (col != 0) {
            gdk_draw_line (drawable, light_gc,
                       week_view->col_offsets[col] - x,
                       4 - y,
                       week_view->col_offsets[col] - x,
                       canvas_height - 4 - y);

            gdk_draw_line (drawable, dark_gc,
                       week_view->col_offsets[col] - 1 - x,
                       4 - y,
                       week_view->col_offsets[col] - 1 - x,
                       canvas_height - 4 - y);
        }

        /* Draw the lines between each column. */
        if (col != 0) {
            gdk_draw_line (drawable, style->black_gc,
                       week_view->col_offsets[col] - x,
                       canvas_height - y,
                       week_view->col_offsets[col] - x,
                       canvas_height - y);
        }

        if (weekday == 5 && week_view->compress_weekend)
            weekday += 2;
        else
            weekday++;

        weekday = weekday % 7;

        g_date_add_days (&date, 1);
    }

    g_object_unref (layout);
}


/* This is supposed to return the nearest item the the point and the distance.
   Since we are the only item we just return ourself and 0 for the distance.
   This is needed so that we get button/motion events. */
static double
e_week_view_titles_item_point (GnomeCanvasItem *item, double x, double y,
                   int cx, int cy,
                   GnomeCanvasItem **actual_item)
{
    *actual_item = item;
    return 0.0;
}