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path: root/calendar/gui/e-week-view-main-item.c
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/* 
 * Author : 
 *  Damon Chaplin <damon@ximian.com>
 *
 * Copyright 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
 */

/*
 * EWeekViewMainItem - displays the background grid and dates for the Week and
 * Month calendar views.
 */

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

#include <string.h>
#include <glib.h>
#include <libgnome/gnome-i18n.h>
#include "e-week-view-main-item.h"
#include "ea-calendar.h"

static void e_week_view_main_item_set_arg   (GtkObject   *o,
                         GtkArg      *arg,
                         guint        arg_id);
static void e_week_view_main_item_update    (GnomeCanvasItem *item,
                         double      *affine,
                         ArtSVP      *clip_path,
                         int          flags);
static void e_week_view_main_item_draw      (GnomeCanvasItem *item,
                         GdkDrawable     *drawable,
                         int          x,
                         int          y,
                         int          width,
                         int          height);
static void e_week_view_main_item_draw_day  (EWeekViewMainItem *wvmitem,
                         gint          day,
                         GDate        *date,
                         GdkDrawable       *drawable,
                         gint          x,
                         gint          y,
                         gint          width,
                         gint          height);
static double e_week_view_main_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 (EWeekViewMainItem, e_week_view_main_item, GNOME_TYPE_CANVAS_ITEM)

static void
e_week_view_main_item_class_init (EWeekViewMainItemClass *class)
{
    GtkObjectClass  *object_class;
    GnomeCanvasItemClass *item_class;

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

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

    object_class->set_arg = e_week_view_main_item_set_arg;

    /* GnomeCanvasItem method overrides */
    item_class->update      = e_week_view_main_item_update;
    item_class->draw        = e_week_view_main_item_draw;
    item_class->point       = e_week_view_main_item_point;

    /* init the accessibility support for e_week_view_main_item */
    e_week_view_main_item_a11y_init ();
}


static void
e_week_view_main_item_init (EWeekViewMainItem *wvmitem)
{
    wvmitem->week_view = NULL;
}


static void
e_week_view_main_item_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
    EWeekViewMainItem *wvmitem;

    wvmitem = E_WEEK_VIEW_MAIN_ITEM (o);
    
    switch (arg_id){
    case ARG_WEEK_VIEW:
        wvmitem->week_view = GTK_VALUE_POINTER (*arg);
        break;
    }
}


static void
e_week_view_main_item_update (GnomeCanvasItem *item,
                  double          *affine,
                  ArtSVP          *clip_path,
                  int          flags)
{
    if (GNOME_CANVAS_ITEM_CLASS (e_week_view_main_item_parent_class)->update)
        (* GNOME_CANVAS_ITEM_CLASS (e_week_view_main_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_main_item_draw (GnomeCanvasItem  *canvas_item,
                GdkDrawable      *drawable,
                int           x,
                int           y,
                int           width,
                int           height)
{
    EWeekViewMainItem *wvmitem;
    EWeekView *week_view;
    GDate date;
    gint num_days, day, day_x, day_y, day_w, day_h;

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

    wvmitem = E_WEEK_VIEW_MAIN_ITEM (canvas_item);
    week_view = wvmitem->week_view;
    g_return_if_fail (week_view != NULL);

    /* Step through each of the days. */
    date = week_view->first_day_shown;

    /* If no date has been set, we just use Dec 1999/January 2000. */
    if (!g_date_valid (&date))
        g_date_set_dmy (&date, 27, 12, 1999);

    num_days = week_view->multi_week_view ? week_view->weeks_shown * 7 : 7;
    for (day = 0; day < num_days; day++) {
        e_week_view_get_day_position (week_view, day,
                          &day_x, &day_y,
                          &day_w, &day_h);
        /* Skip any days which are outside the area. */
        if (day_x < x + width && day_x + day_w >= x
            && day_y < y + height && day_y + day_h >= y) {
            e_week_view_main_item_draw_day (wvmitem, day, &date,
                            drawable,
                            day_x - x, day_y - y,
                            day_w, day_h);
        }
        g_date_add_days (&date, 1);
    }
}
#ifndef ENABLE_CAIRO
static void
e_week_view_main_item_draw_day (EWeekViewMainItem *wvmitem,
                gint           day,
                GDate         *date,
                GdkDrawable       *drawable,
                gint           x,
                gint           y,
                gint           width,
                gint           height)
{
    EWeekView *week_view;
    GtkStyle *style;
    GdkGC *gc;
    gint right_edge, bottom_edge, date_width, date_x, line_y;
    gboolean show_day_name, show_month_name, selected;
    gchar buffer[128], *format_string;
    gint month, day_of_month, max_width;
    GdkColor *bg_color;
    PangoFontDescription *font_desc;
    PangoContext *pango_context;
    PangoFontMetrics *font_metrics;
    PangoLayout *layout;
    gboolean today = FALSE;

#if 0
    g_print ("Drawing Day:%i at %i,%i\n", day, x, y);
#endif
    week_view = wvmitem->week_view;
    style = gtk_widget_get_style (GTK_WIDGET (week_view));
    gc = week_view->main_gc;

    /* Set up Pango prerequisites */
    font_desc = style->font_desc;
    pango_context = gtk_widget_get_pango_context (GTK_WIDGET (week_view));
    font_metrics = pango_context_get_metrics (pango_context, font_desc,
                          pango_context_get_language (pango_context));

    g_return_if_fail (gc != NULL);

    month = g_date_month (date);
    day_of_month = g_date_day (date);
    line_y = y + E_WEEK_VIEW_DATE_T_PAD +
        PANGO_PIXELS (pango_font_metrics_get_ascent (font_metrics)) +
        PANGO_PIXELS (pango_font_metrics_get_descent (font_metrics)) +
        E_WEEK_VIEW_DATE_LINE_T_PAD;

    /* Draw the background of the day. In the month view odd months are
       one color and even months another, so you can easily see when each
       month starts (defaults are white for odd - January, March, ... and
       light gray for even). In the week view the background is always the
       same color, the color used for the odd months in the month view. */
    if (week_view->multi_week_view && (month % 2 == 0))
        bg_color = &week_view->colors[E_WEEK_VIEW_COLOR_EVEN_MONTHS];
    else
        bg_color = &week_view->colors[E_WEEK_VIEW_COLOR_ODD_MONTHS];

    gdk_gc_set_foreground (gc, bg_color);
    gdk_draw_rectangle (drawable, gc, TRUE, x, y, width, height);

    /* Draw the lines on the right and bottom of the cell. The canvas is
       sized so that the lines on the right & bottom edges will be off the
       edge of the canvas, so we don't have to worry about them. */
    right_edge = x + width - 1;
    bottom_edge = y + height - 1;

    gdk_gc_set_foreground (gc, &week_view->colors[E_WEEK_VIEW_COLOR_GRID]);
    gdk_draw_line (drawable, gc,
               right_edge, y, right_edge, bottom_edge);
    gdk_draw_line (drawable, gc,
               x, bottom_edge, right_edge, bottom_edge);

    /* If the day is selected, draw the blue background. */
    selected = TRUE;
    if (week_view->selection_start_day == -1
        || week_view->selection_start_day > day
        || week_view->selection_end_day < day)
        selected = FALSE;
    if (selected) {
        if (GTK_WIDGET_HAS_FOCUS (week_view))
            gdk_gc_set_foreground (gc, &week_view->colors[E_WEEK_VIEW_COLOR_SELECTED]);
        else
            gdk_gc_set_foreground (gc, &week_view->colors[E_WEEK_VIEW_COLOR_SELECTED_UNFOCUSSED]);

        if (week_view->multi_week_view) {
            gdk_draw_rectangle (drawable, gc, TRUE,
                        x + 2, y + 1,
                        width - 5,
                        E_WEEK_VIEW_DATE_T_PAD - 1 +
                        PANGO_PIXELS (pango_font_metrics_get_ascent (font_metrics)) +
                        PANGO_PIXELS (pango_font_metrics_get_descent (font_metrics)));
        } else {
            gdk_draw_rectangle (drawable, gc, TRUE,
                        x + 2, y + 1,
                        width - 5, line_y - y);
        }
    }
    
    /* Display the date in the top of the cell.
       In the week view, display the long format "10 January" in all cells,
       or abbreviate it to "10 Jan" or "10" if that doesn't fit.
       In the month view, only use the long format for the first cell and
       the 1st of each month, otherwise use "10". */
    show_day_name = FALSE;
    show_month_name = FALSE;
    if (!week_view->multi_week_view) {
        show_day_name = TRUE;
        show_month_name = TRUE;
    } else if (day == 0 || day_of_month == 1) {
        show_month_name = TRUE;
    }

    /* Now find the longest form of the date that will fit. */
    max_width = width - 4;
    format_string = NULL;
    if (show_day_name) {
        if (week_view->max_day_width + week_view->digit_width * 2
            + week_view->space_width * 2
            + week_view->month_widths[month - 1] < max_width)
            /* strftime format %A = full weekday name, %d = day of
               month, %B = full month name. You can change the
               order but don't change the specifiers or add
               anything. */
            format_string = _("%A %d %B");
        else if (week_view->max_abbr_day_width
             + week_view->digit_width * 2
             + week_view->space_width * 2
             + week_view->abbr_month_widths[month - 1] < max_width)
            /* strftime format %a = abbreviated weekday name,
               %d = day of month, %b = abbreviated month name.
               You can change the order but don't change the
               specifiers or add anything. */
            format_string = _("%a %d %b");
    }
    if (!format_string && show_month_name) {
        if (week_view->digit_width * 2 + week_view->space_width
            + week_view->month_widths[month - 1] < max_width)
            /* strftime format %d = day of month, %B = full
               month name. You can change the order but don't
               change the specifiers or add anything. */
            format_string = _("%d %B");
        else if (week_view->digit_width * 2 + week_view->space_width
            + week_view->abbr_month_widths[month - 1] < max_width)
            /* strftime format %d = day of month, %b = abbreviated
               month name. You can change the order but don't
               change the specifiers or add anything. */
            format_string = _("%d %b");
    }

    if (selected) {
        gdk_gc_set_foreground (gc, &week_view->colors[E_WEEK_VIEW_COLOR_DATES_SELECTED]);
    } else if (week_view->multi_week_view) {
        struct icaltimetype tt;

        /* Check if we are drawing today */     
        tt = icaltime_from_timet_with_zone (time (NULL), FALSE,
                            e_calendar_view_get_timezone (E_CALENDAR_VIEW (week_view)));
        if (g_date_year (date) == tt.year 
            && g_date_month (date) == tt.month
            && g_date_day (date) == tt.day) {
            gdk_gc_set_foreground (gc, &week_view->colors[E_WEEK_VIEW_COLOR_TODAY]);
            today = TRUE;
        }
        else
            gdk_gc_set_foreground (gc, &week_view->colors[E_WEEK_VIEW_COLOR_DATES]);
    } else {
        gdk_gc_set_foreground (gc, &week_view->colors[E_WEEK_VIEW_COLOR_DATES]);
    }

    if (today) {
        g_date_strftime (buffer, sizeof (buffer),
                 format_string ? format_string : "<b>%d</b>", date);
        layout = gtk_widget_create_pango_layout (GTK_WIDGET (week_view), buffer);
        pango_layout_set_markup (layout, buffer, strlen(buffer));   
    } else {
        g_date_strftime (buffer, sizeof (buffer),
                 format_string ? format_string : "%d", date);
        layout = gtk_widget_create_pango_layout (GTK_WIDGET (week_view), buffer);   
    }

    pango_layout_get_pixel_size (layout, &date_width, NULL);
    date_x = x + width - date_width - E_WEEK_VIEW_DATE_R_PAD;
    date_x = MAX (date_x, x + 1);

    gdk_draw_layout (drawable, gc,
             date_x,
             y + E_WEEK_VIEW_DATE_T_PAD,
             layout);
    g_object_unref (layout);

    /* Draw the line under the date. */
    if (!week_view->multi_week_view) {
        gdk_gc_set_foreground (gc, &week_view->colors[E_WEEK_VIEW_COLOR_GRID]);
        gdk_draw_line (drawable, gc,
                   x + E_WEEK_VIEW_DATE_LINE_L_PAD, line_y,
                   right_edge, line_y);
    }

    pango_font_metrics_unref (font_metrics);
}
#endif

#ifdef ENABLE_CAIRO
static void
e_week_view_main_item_draw_day (EWeekViewMainItem *wvmitem,
                gint           day,
                GDate         *date,
                GdkDrawable       *drawable,
                gint           x,
                gint           y,
                gint           width,
                gint           height)
{
    EWeekView *week_view;
    GtkStyle *style;
    GdkGC *gc;
    gint right_edge, bottom_edge, date_width, date_x, line_y;
    gboolean show_day_name, show_month_name, selected;
    gchar buffer[128], *format_string;
    gint month, day_of_month, max_width;
    GdkColor *bg_color;
    PangoFontDescription *font_desc;
    PangoContext *pango_context;
    PangoFontMetrics *font_metrics;
    PangoLayout *layout;
    gboolean today = FALSE;
    cairo_t *cr;

#if 0
    g_print ("Drawing Day:%i at %i,%i\n", day, x, y);
#endif
    week_view = wvmitem->week_view;
    style = gtk_widget_get_style (GTK_WIDGET (week_view));
    gc = week_view->main_gc;
    cr = gdk_cairo_create (drawable);

    /* Set up Pango prerequisites */
    font_desc = pango_font_description_copy (style->font_desc);
    pango_context = gtk_widget_get_pango_context (GTK_WIDGET (week_view));
    font_metrics = pango_context_get_metrics (pango_context, font_desc,
                          pango_context_get_language (pango_context));

    g_return_if_fail (gc != NULL);

    month = g_date_month (date);
    day_of_month = g_date_day (date);
    line_y = y + E_WEEK_VIEW_DATE_T_PAD +
        PANGO_PIXELS (pango_font_metrics_get_ascent (font_metrics)) +
        PANGO_PIXELS (pango_font_metrics_get_descent (font_metrics)) +
        E_WEEK_VIEW_DATE_LINE_T_PAD;

    /* Draw the background of the day. In the month view odd months are
       one color and even months another, so you can easily see when each
       month starts (defaults are white for odd - January, March, ... and
       light gray for even). In the week view the background is always the
       same color, the color used for the odd months in the month view. */
    if (week_view->multi_week_view && (month % 2 == 0)) 
        bg_color = &week_view->colors[E_WEEK_VIEW_COLOR_EVEN_MONTHS];
    else 
        bg_color = &week_view->colors[E_WEEK_VIEW_COLOR_ODD_MONTHS];

    cairo_save (cr);
    gdk_cairo_set_source_color (cr, bg_color);
    cairo_rectangle (cr, x, y, width, height);
    cairo_fill (cr);
    cairo_restore (cr);

    /* Draw the lines on the right and bottom of the cell. The canvas is
       sized so that the lines on the right & bottom edges will be off the
       edge of the canvas, so we don't have to worry about them. */
    right_edge = x + width - 1;
    bottom_edge = y + height - 1;

    cairo_save (cr);
    gdk_cairo_set_source_color (cr,  &week_view->colors[E_WEEK_VIEW_COLOR_GRID]);
    cairo_set_line_width (cr, 0.7);
    cairo_move_to (cr, right_edge, y);
    cairo_line_to (cr, right_edge, bottom_edge);
    cairo_move_to (cr, x, bottom_edge);
    cairo_line_to (cr, right_edge, bottom_edge);
    cairo_stroke (cr);
    cairo_restore (cr);

    /* If the day is selected, draw the blue background. */
    cairo_save (cr);
    selected = TRUE;
    if (week_view->selection_start_day == -1
        || week_view->selection_start_day > day
        || week_view->selection_end_day < day)
        selected = FALSE;
    if (selected) {
        if (GTK_WIDGET_HAS_FOCUS (week_view)) {
            gdk_cairo_set_source_color (cr, &week_view->colors[E_WEEK_VIEW_COLOR_SELECTED]);
        } else {
            gdk_cairo_set_source_color (cr, &week_view->colors[E_WEEK_VIEW_COLOR_SELECTED]);
        }

        if (week_view->multi_week_view) { 
            cairo_rectangle (cr, x + 2, y + 1,
                        width - 5,
                        E_WEEK_VIEW_DATE_T_PAD - 1 +
                PANGO_PIXELS (pango_font_metrics_get_ascent (font_metrics)) +
                PANGO_PIXELS (pango_font_metrics_get_descent (font_metrics)));
            cairo_fill (cr);
        } else {
            cairo_rectangle (cr, x + 2, y + 1,
                    width - 5, line_y - y);
            cairo_fill (cr);
        }
    }   
    cairo_restore (cr); 
    
    /* Display the date in the top of the cell.
       In the week view, display the long format "10 January" in all cells,
       or abbreviate it to "10 Jan" or "10" if that doesn't fit.
       In the month view, only use the long format for the first cell and
       the 1st of each month, otherwise use "10". */
    show_day_name = FALSE;
    show_month_name = FALSE;
    if (!week_view->multi_week_view) {
        show_day_name = TRUE;
        show_month_name = TRUE;
    } else if (day == 0 || day_of_month == 1) {
        show_month_name = TRUE;
    }

    /* Now find the longest form of the date that will fit. */
    max_width = width - 4;
    format_string = NULL;
    if (show_day_name) {
        if (week_view->max_day_width + week_view->digit_width * 2
            + week_view->space_width * 2
            + week_view->month_widths[month - 1] < max_width)
            /* strftime format %A = full weekday name, %d = day of
               month, %B = full month name. You can change the
               order but don't change the specifiers or add
               anything. */
            format_string = _("%A %d %B");
        else if (week_view->max_abbr_day_width
             + week_view->digit_width * 2
             + week_view->space_width * 2
             + week_view->abbr_month_widths[month - 1] < max_width)
            /* strftime format %a = abbreviated weekday name,
               %d = day of month, %b = abbreviated month name.
               You can change the order but don't change the
               specifiers or add anything. */
            format_string = _("%a %d %b");
    }
    if (!format_string && show_month_name) {
        if (week_view->digit_width * 2 + week_view->space_width
            + week_view->month_widths[month - 1] < max_width)
            /* strftime format %d = day of month, %B = full
               month name. You can change the order but don't
               change the specifiers or add anything. */
            format_string = _("%d %B");
        else if (week_view->digit_width * 2 + week_view->space_width
            + week_view->abbr_month_widths[month - 1] < max_width)
            /* strftime format %d = day of month, %b = abbreviated
               month name. You can change the order but don't
               change the specifiers or add anything. */
            format_string = _("%d %b");
    }

    cairo_save (cr);
    if (selected) {
        gdk_cairo_set_source_color (cr, &week_view->colors[E_WEEK_VIEW_COLOR_DATES_SELECTED]);
    } else if (week_view->multi_week_view) {
        struct icaltimetype tt;

        /* Check if we are drawing today */     
        tt = icaltime_from_timet_with_zone (time (NULL), FALSE,
                            e_calendar_view_get_timezone (E_CALENDAR_VIEW (week_view)));
        if (g_date_year (date) == tt.year 
            && g_date_month (date) == tt.month
            && g_date_day (date) == tt.day) {
            gdk_cairo_set_source_color (cr, &week_view->colors[E_WEEK_VIEW_COLOR_TODAY]);
            today = TRUE;
        }
        else {
            gdk_cairo_set_source_color (cr, &week_view->colors[E_WEEK_VIEW_COLOR_DATES]);

            }
    } else {
        gdk_cairo_set_source_color (cr, &week_view->colors[E_WEEK_VIEW_COLOR_DATES]);
    }

    if (today) {
        g_date_strftime (buffer, sizeof (buffer),
                 format_string ? format_string : "<b>%d</b>", date);
        pango_cairo_update_context (cr, pango_context);
        layout = pango_cairo_create_layout (cr);
        pango_layout_set_font_description (layout, font_desc);
        pango_layout_set_text (layout, buffer, -1);
        pango_layout_set_markup (layout, buffer, strlen(buffer));   
    } else {
        g_date_strftime (buffer, sizeof (buffer),
                 format_string ? format_string : "%d", date);
        pango_cairo_update_context (cr, pango_context);
        layout = pango_cairo_create_layout (cr);
        pango_layout_set_font_description (layout, font_desc);
        pango_layout_set_text (layout, buffer, -1);
    }

    pango_layout_get_pixel_size (layout, &date_width, NULL);
    date_x = x + width - date_width - E_WEEK_VIEW_DATE_R_PAD;
    date_x = MAX (date_x, x + 1);

    cairo_translate (cr, date_x, y + E_WEEK_VIEW_DATE_T_PAD);
    pango_cairo_update_layout (cr, layout);
    pango_cairo_show_layout (cr, layout);
    cairo_restore (cr);
    g_object_unref (layout);

    /* Draw the line under the date. */
    if (!week_view->multi_week_view) {
        cairo_save (cr);
        gdk_cairo_set_source_color (cr, &week_view->colors[E_WEEK_VIEW_COLOR_GRID]);
        cairo_set_line_width (cr, 0.7);
        cairo_move_to (cr, x + E_WEEK_VIEW_DATE_LINE_L_PAD, line_y);
        cairo_line_to (cr, right_edge, line_y);
        cairo_stroke (cr);
        cairo_restore (cr);
    }
    pango_font_metrics_unref (font_metrics);
    pango_font_description_free (font_desc);
    cairo_destroy (cr);
}
#endif

/* 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_main_item_point (GnomeCanvasItem *item, double x, double y,
                 int cx, int cy,
                 GnomeCanvasItem **actual_item)
{
    *actual_item = item;
    return 0.0;
}