path: root/calendar/gui/e-cal-component-preview.c

/*
 * 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:
 *      Federico Mena Quintero <federico@ximian.com>
 *      Damon Chaplin <damon@ximian.com>
 *      Rodrigo Moya <rodrigo@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <string.h>
#include <gio/gio.h>
#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include <libgnome/gnome-url.h>
#include <libedataserver/e-categories.h>
#include <libecal/e-cal-time-util.h>
#include <gtkhtml/gtkhtml.h>
#include <gtkhtml/gtkhtml-stream.h>
#include <libedataserver/e-time-utils.h>
#include <e-util/e-categories-config.h>
#include "calendar-config.h"
#include "e-cal-component-preview.h"
#include <camel/camel-mime-filter-tohtml.h>

struct _ECalComponentPreviewPrivate {
    GtkWidget *html;

    icaltimezone *zone;
};

G_DEFINE_TYPE (ECalComponentPreview, e_cal_component_preview, GTK_TYPE_TABLE)

static void
on_link_clicked (GtkHTML *html, const char *url, gpointer data)
{
        GError *err = NULL;

        gnome_url_show (url, &err);

    if (err) {
        g_warning ("gnome_url_show: %s", err->message);
                g_error_free (err);
        }
}

static void
on_url_cb (GtkHTML *html, const char *url, gpointer data)
{
#if 0
    char *msg;
    ECalComponentPreview *preview = data;

    if (url && *url) {
        msg = g_strdup_printf (_("Click to open %s"), url);
        e_calendar_table_set_status_message (e_tasks_get_calendar_table (tasks), msg);
        g_free (msg);
    } else
        e_calendar_table_set_status_message (e_tasks_get_calendar_table (tasks), NULL);
#endif
}

/* Callback used when the user selects a URL in the HTML widget */
void
e_cal_comp_preview_url_requested_cb (GtkHTML *html, const char *url, GtkHTMLStream *html_stream, gpointer data)
{
    int len = strlen ("file:///");

    if (!strncmp ("file:///", url, len)) {
        GFile *file;
        const char *path = url + len - 1;

        g_return_if_fail (html_stream != NULL);
        g_return_if_fail (path != NULL);

        file = g_file_new_for_path (path);
        if (file) {
            char buffer[4096];
            GInputStream *stream;

            /* ignore errors here */
            stream = G_INPUT_STREAM (g_file_read (file, NULL, NULL));

            if (stream) {
                gssize bread;

                do {
                    /* ignore errors here as well */
                    bread = g_input_stream_read (stream, buffer, sizeof (buffer), NULL, NULL);
                    if (bread > 0)
                        gtk_html_stream_write (html_stream, buffer, bread);
                } while (bread > 0);

                g_input_stream_close (stream, NULL, NULL);
                g_object_unref (stream);

                gtk_html_stream_close (html_stream, GTK_HTML_STREAM_OK);
            }

            g_object_unref (file);
        }
    }
}

/* Converts a time_t to a string, relative to the specified timezone */
static char *
timet_to_str_with_zone (ECalComponentDateTime *dt, ECal *ecal, icaltimezone *default_zone)
{
    struct icaltimetype itt;
    icaltimezone *zone;
        struct tm tm;
        char buf[256];

    if (dt->tzid) {
        /* If we can't find the zone, we'll guess its "local" */
        if (!e_cal_get_timezone (ecal, dt->tzid, &zone, NULL))
            zone = NULL;
    } else if (dt->value->is_utc) {
        zone = icaltimezone_get_utc_timezone ();
    } else {
        zone = NULL;
    }


    itt = *dt->value;
    if (zone)
        icaltimezone_convert_time (&itt, zone, default_zone);
        tm = icaltimetype_to_tm (&itt);

        e_time_format_date_and_time (&tm, calendar_config_get_24_hour_format (),
                                     FALSE, FALSE, buf, sizeof (buf));

    return g_locale_to_utf8 (buf, -1, NULL, NULL, NULL);
}

static void
write_html (GtkHTMLStream *stream, ECal *ecal, ECalComponent *comp, icaltimezone *default_zone)
{
    ECalComponentText text;
    ECalComponentDateTime dt;
    gchar *str;
    GSList *l;
    icalproperty_status status;
    const char *location;
    int *priority_value;

    g_return_if_fail (E_IS_CAL_COMPONENT (comp));

    /* write document header */
    e_cal_component_get_summary (comp, &text);

    if (text.value)
        gtk_html_stream_printf (stream,
                    "<HTML><BODY><H1>%s</H1>",
                    text.value);
    else
        gtk_html_stream_printf (stream,
                    "<HTML><BODY><H1><I>%s</I></H1>",
                    _("Untitled"));


    /* write icons for the categories */
    e_cal_component_get_categories_list (comp, &l);
    if (l) {
        GSList *node;

        for (node = l; node != NULL; node = node->next) {
            const char *icon_file;

            icon_file = e_categories_get_icon_file_for ((const char *) node->data);
            if (icon_file) {
                gchar *icon_file_uri = g_filename_to_uri (icon_file, NULL, NULL);
                gtk_html_stream_printf (stream, "<IMG ALT=\"%s\" SRC=\"%s\">",
                            (const char *) node->data, icon_file_uri);
                g_free (icon_file_uri);
            }
        }

        e_cal_component_free_categories_list (l);

        gtk_html_stream_printf (stream, "<BR><BR><BR>");
    }

    /* Start table */
    gtk_html_stream_printf (stream, "<TABLE BORDER=\"0\" WIDTH=\"80%%\">"
                "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\" WIDTH=\"15%%\"></TD></TR>");

    /* write location */
    e_cal_component_get_location (comp, &location);
    if (location)
        gtk_html_stream_printf (stream, "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\" WIDTH=\"15%%\"><B>%s</B></TD><TD>%s</TD></TR>",
                    _("Summary:"), text.value);

    /* write start date */
    e_cal_component_get_dtstart (comp, &dt);
    if (dt.value != NULL) {
        str = timet_to_str_with_zone (&dt, ecal, default_zone);
        gtk_html_stream_printf (stream, "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\"><B>%s</B></TD><TD>%s</TD></TR>",
                    _("Start Date:"), str);

        g_free (str);
    }
    e_cal_component_free_datetime (&dt);

    /* write end date */
    e_cal_component_get_dtend (comp, &dt);
    if (dt.value != NULL) {
        str = timet_to_str_with_zone (&dt, ecal, default_zone);
        gtk_html_stream_printf (stream, "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\"><B>%s</B></TD><TD>%s</TD></TR>",
                    _("Start Date:"), str);

        g_free (str);
    }
    e_cal_component_free_datetime (&dt);

    /* write Due Date */
    e_cal_component_get_due (comp, &dt);
    if (dt.value != NULL) {
        str = timet_to_str_with_zone (&dt, ecal, default_zone);
        gtk_html_stream_printf (stream, "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\"><B>%s</B></TD><TD>%s</TD></TR>",
                    _("Due Date:"), str);

        g_free (str);
    }
    e_cal_component_free_datetime (&dt);

    /* write status */
    gtk_html_stream_printf (stream, "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\"><B>%s</B></TD>", _("Status:"));
    e_cal_component_get_status (comp, &status);
    switch (status) {
    case ICAL_STATUS_INPROCESS :
        str = g_strdup (_("In Progress"));
        break;
    case ICAL_STATUS_COMPLETED :
        str = g_strdup (_("Completed"));
        break;
    case ICAL_STATUS_CANCELLED :
        str = g_strdup (_("Canceled"));
        break;
    case ICAL_STATUS_NONE :
    default :
        str = g_strdup (_("Not Started"));
        break;
    }

    gtk_html_stream_printf (stream, "<TD>%s</TD></TR>", str);
    g_free (str);

    /* write priority */
    e_cal_component_get_priority (comp, &priority_value);
    if (priority_value && *priority_value != 0) {
        gtk_html_stream_printf (stream, "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\"><B>%s</B></TD>", _("Priority:"));
        if (*priority_value <= 4)
            str = g_strdup (_("High"));
        else if (*priority_value == 5)
            str = g_strdup (_("Normal"));
        else
            str = g_strdup (_("Low"));

        gtk_html_stream_printf (stream, "<TD>%s</TD></TR>", str);

        g_free (str);
        e_cal_component_free_priority (priority_value);
    }

    /* write description and URL */
    gtk_html_stream_printf (stream, "<TR><TD COLSPAN=\"2\"><HR></TD></TR>");

    e_cal_component_get_description_list (comp, &l);
    if (l) {
        GSList *node;

        gtk_html_stream_printf (stream, "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\"><B>%s</B></TD>", _("Description:"));

        gtk_html_stream_printf (stream, "<TD><TT>");

        for (node = l; node != NULL; node = node->next) {
            char *html;

            text = * (ECalComponentText *) node->data;
            html = camel_text_to_html (text.value ? text.value : "", CAMEL_MIME_FILTER_TOHTML_CONVERT_NL | CAMEL_MIME_FILTER_TOHTML_CONVERT_SPACES | CAMEL_MIME_FILTER_TOHTML_CONVERT_URLS | CAMEL_MIME_FILTER_TOHTML_CONVERT_ADDRESSES, 0);

            if (html)
                gtk_html_stream_printf (stream, "%s", html);

            g_free (html);
        }

        gtk_html_stream_printf (stream, "</TT></TD></TR>");

        e_cal_component_free_text_list (l);
    }

    /* URL */
    e_cal_component_get_url (comp, (const char **) &str);
    if (str) {
        gtk_html_stream_printf (stream, "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\"><B>%s</B></TD>", _("Web Page:"));
        gtk_html_stream_printf (stream, "<TD><A HREF=\"%s\">%s</A></TD></TR>", str, str);
    }

    gtk_html_stream_printf (stream, "</TABLE>");

    /* close document */
    gtk_html_stream_printf (stream, "</BODY></HTML>");
}

static void
e_cal_component_preview_init (ECalComponentPreview *preview)
{
    ECalComponentPreviewPrivate *priv;
    GtkWidget *scroll;

    priv = g_new0 (ECalComponentPreviewPrivate, 1);
    preview->priv = priv;

    priv->html = gtk_html_new ();
    gtk_html_set_default_content_type (GTK_HTML (priv->html), "charset=utf-8");
    gtk_html_load_empty (GTK_HTML (priv->html));

    g_signal_connect (G_OBJECT (priv->html), "url_requested",
              G_CALLBACK (e_cal_comp_preview_url_requested_cb), NULL);
    g_signal_connect (G_OBJECT (priv->html), "link_clicked",
              G_CALLBACK (on_link_clicked), preview);
    g_signal_connect (G_OBJECT (priv->html), "on_url",
              G_CALLBACK (on_url_cb), preview);

    scroll = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scroll),
                    GTK_POLICY_AUTOMATIC,
                    GTK_POLICY_AUTOMATIC);
    gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scroll), GTK_SHADOW_IN);

    gtk_container_add (GTK_CONTAINER (scroll), priv->html);
    gtk_container_add (GTK_CONTAINER (preview), scroll);
    gtk_widget_show_all (scroll);

    priv->zone = icaltimezone_get_utc_timezone ();
}

static void
e_cal_component_preview_destroy (GtkObject *object)
{
    ECalComponentPreview *preview;
    ECalComponentPreviewPrivate *priv;

    g_return_if_fail (object != NULL);
    g_return_if_fail (E_IS_CAL_COMPONENT_PREVIEW (object));

    preview = E_CAL_COMPONENT_PREVIEW (object);
    priv = preview->priv;

    if (priv) {

        g_free (priv);
        preview->priv = NULL;
    }

    if (GTK_OBJECT_CLASS (e_cal_component_preview_parent_class)->destroy)
        (* GTK_OBJECT_CLASS (e_cal_component_preview_parent_class)->destroy) (object);
}

static void
e_cal_component_preview_class_init (ECalComponentPreviewClass *klass)
{
    GtkObjectClass *object_class;

    object_class = (GtkObjectClass *) klass;

    object_class->destroy = e_cal_component_preview_destroy;
}

GtkWidget *
e_cal_component_preview_new (void)
{
    ECalComponentPreview *preview;

    preview = g_object_new (e_cal_component_preview_get_type (), NULL);

    return GTK_WIDGET (preview);
}

icaltimezone *
e_cal_component_preview_get_default_timezone (ECalComponentPreview *preview)
{
    ECalComponentPreviewPrivate *priv;

    g_return_val_if_fail (preview != NULL, NULL);
    g_return_val_if_fail (E_IS_CAL_COMPONENT_PREVIEW (preview), NULL);

    priv = preview->priv;

    return priv->zone;
}

void
e_cal_component_preview_set_default_timezone (ECalComponentPreview *preview, icaltimezone *zone)
{
    ECalComponentPreviewPrivate *priv;

    g_return_if_fail (preview != NULL);
    g_return_if_fail (E_IS_CAL_COMPONENT_PREVIEW (preview));
    g_return_if_fail (zone != NULL);

    priv = preview->priv;

    priv->zone = zone;
}

void
e_cal_component_preview_display (ECalComponentPreview *preview, ECal *ecal, ECalComponent *comp)
{
    ECalComponentPreviewPrivate *priv;
    GtkHTMLStream *stream;

    g_return_if_fail (preview != NULL);
    g_return_if_fail (E_IS_CAL_COMPONENT_PREVIEW (preview));
    g_return_if_fail (comp != NULL);
    g_return_if_fail (E_IS_CAL_COMPONENT (comp));

    priv = preview->priv;

    stream = gtk_html_begin (GTK_HTML (priv->html));
    write_html (stream, ecal, comp, priv->zone);
    gtk_html_stream_close (stream, GTK_HTML_STREAM_OK);
}

void
e_cal_component_preview_clear (ECalComponentPreview *preview)
{
    ECalComponentPreviewPrivate *priv;

    g_return_if_fail (preview != NULL);
    g_return_if_fail (E_IS_CAL_COMPONENT_PREVIEW (preview));

    priv = preview->priv;

    gtk_html_load_empty (GTK_HTML (priv->html));
}