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

/*
 * EWeekViewMainItem - displays the background grid and dates for the Week and
 * Month calendar views.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 * Authors:
 *      Damon Chaplin <damon@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 */

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

#include <string.h>
#include <glib/gi18n.h>

#include "e-week-view-main-item.h"
#include "ea-calendar.h"
#include "calendar-config.h"

#define E_WEEK_VIEW_MAIN_ITEM_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_WEEK_VIEW_MAIN_ITEM, EWeekViewMainItemPrivate))

struct _EWeekViewMainItemPrivate {
    EWeekView *week_view;
};

enum {
    PROP_0,
    PROP_WEEK_VIEW
};

G_DEFINE_TYPE (
    EWeekViewMainItem,
    e_week_view_main_item,
    GNOME_TYPE_CANVAS_ITEM)

static void
week_view_main_item_draw_day (EWeekViewMainItem *main_item,
                              gint day,
                              GDate *date,
                              cairo_t *cr,
                              gint x,
                              gint y,
                              gint width,
                              gint height)
{
    EWeekView *week_view;
    ECalModel *model;
    GtkStyle *style;
    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;
    GDateWeekday weekday;
    GdkColor *bg_color;
    PangoFontDescription *font_desc;
    PangoContext *pango_context;
    PangoFontMetrics *font_metrics;
    PangoLayout *layout;
    gboolean today = FALSE;
    gboolean multi_week_view;

    week_view = e_week_view_main_item_get_week_view (main_item);
    model = e_calendar_view_get_model (E_CALENDAR_VIEW (week_view));
    style = gtk_widget_get_style (GTK_WIDGET (week_view));

    multi_week_view = e_week_view_get_multi_week_view (week_view);

    /* 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));

    month = g_date_get_month (date);
    weekday = g_date_get_weekday (date);
    day_of_month = g_date_get_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;

    if (!today) {
        ECalendarView *view;
        struct icaltimetype tt;
        const icaltimezone *zone;

        view = E_CALENDAR_VIEW (week_view);
        zone = e_calendar_view_get_timezone (view);

        /* Check if we are drawing today */
        tt = icaltime_from_timet_with_zone (
            time (NULL), FALSE, zone);
        today = g_date_get_year (date) == tt.year
            && g_date_get_month (date) == tt.month
            && g_date_get_day (date) == tt.day;
    }

    /* 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 (today)
        bg_color = &week_view->colors[E_WEEK_VIEW_COLOR_TODAY_BACKGROUND];
    else if (!e_cal_model_get_work_day (model, weekday))
        bg_color = &week_view->colors[E_WEEK_VIEW_COLOR_MONTH_NONWORKING_DAY];
    else if (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 (GTK_WIDGET (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 (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 (!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 (multi_week_view) {
        if (today) {
            gdk_cairo_set_source_color (
                cr, &week_view->colors[E_WEEK_VIEW_COLOR_TODAY]);
        } 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 (!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);
}

static void
week_view_main_item_set_property (GObject *object,
                                  guint property_id,
                                  const GValue *value,
                                  GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_WEEK_VIEW:
            e_week_view_main_item_set_week_view (
                E_WEEK_VIEW_MAIN_ITEM (object),
                g_value_get_object (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
week_view_main_item_get_property (GObject *object,
                                  guint property_id,
                                  GValue *value,
                                  GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_WEEK_VIEW:
            g_value_set_object (
                value, e_week_view_main_item_get_week_view (
                E_WEEK_VIEW_MAIN_ITEM (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
week_view_main_item_dispose (GObject *object)
{
    EWeekViewMainItemPrivate *priv;

    priv = E_WEEK_VIEW_MAIN_ITEM_GET_PRIVATE (object);

    if (priv->week_view != NULL) {
        g_object_unref (priv->week_view);
        priv->week_view = NULL;
    }

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (e_week_view_main_item_parent_class)->dispose (object);
}

static void
week_view_main_item_update (GnomeCanvasItem *item,
                            const cairo_matrix_t *i2c,
                            gint flags)
{
    GnomeCanvasItemClass *canvas_item_class;

    /* Chain up to parent's update() method. */
    canvas_item_class =
        GNOME_CANVAS_ITEM_CLASS (e_week_view_main_item_parent_class);
    canvas_item_class->update (item, i2c, flags);

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

static void
week_view_main_item_draw (GnomeCanvasItem *canvas_item,
                          cairo_t *cr,
                          gint x,
                          gint y,
                          gint width,
                          gint height)
{
    EWeekViewMainItem *main_item;
    EWeekView *week_view;
    GDate date;
    gint num_days, day, day_x, day_y, day_w, day_h;

    main_item = E_WEEK_VIEW_MAIN_ITEM (canvas_item);
    week_view = e_week_view_main_item_get_week_view (main_item);
    g_return_if_fail (week_view != NULL);

    /* Step through each of the days. */
    e_week_view_get_first_day_shown (week_view, &date);

    /* 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 = e_week_view_get_weeks_shown (week_view) * 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) {
            week_view_main_item_draw_day (
                main_item, day, &date, cr,
                day_x - x, day_y - y, day_w, day_h);
        }
        g_date_add_days (&date, 1);
    }
}

static GnomeCanvasItem *
week_view_main_item_point (GnomeCanvasItem *item,
                           gdouble x,
                           gdouble y,
                           gint cx,
                           gint cy)
{
    return item;
}

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

    g_type_class_add_private (class, sizeof (EWeekViewMainItemPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = week_view_main_item_set_property;
    object_class->get_property = week_view_main_item_get_property;
    object_class->dispose = week_view_main_item_dispose;

    item_class = GNOME_CANVAS_ITEM_CLASS (class);
    item_class->update = week_view_main_item_update;
    item_class->draw = week_view_main_item_draw;
    item_class->point = week_view_main_item_point;

    g_object_class_install_property (
        object_class,
        PROP_WEEK_VIEW,
        g_param_spec_object (
            "week-view",
            "Week View",
            NULL,
            E_TYPE_WEEK_VIEW,
            G_PARAM_READWRITE));

    /* 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 *main_item)
{
    main_item->priv = E_WEEK_VIEW_MAIN_ITEM_GET_PRIVATE (main_item);
}

EWeekView *
e_week_view_main_item_get_week_view (EWeekViewMainItem *main_item)
{
    g_return_val_if_fail (E_IS_WEEK_VIEW_MAIN_ITEM (main_item), NULL);

    return main_item->priv->week_view;
}

void
e_week_view_main_item_set_week_view (EWeekViewMainItem *main_item,
                                     EWeekView *week_view)
{
    g_return_if_fail (E_IS_WEEK_VIEW_MAIN_ITEM (main_item));
    g_return_if_fail (E_IS_WEEK_VIEW (week_view));

    if (main_item->priv->week_view == week_view)
        return;

    if (main_item->priv->week_view != NULL)
        g_object_unref (main_item->priv->week_view);

    main_item->priv->week_view = g_object_ref (week_view);

    g_object_notify (G_OBJECT (main_item), "week-view");
}