path: root/widgets/misc/e-web-view-preview.c

/*
 * e-web-view-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/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include "e-web-view-preview.h"

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

struct _EWebViewPreviewPrivate {
    gboolean escape_values;
    GString *updating_content; /* is NULL when not between begin_update/end_update */
};

enum {
    PROP_0,
    PROP_TREE_VIEW,
    PROP_PREVIEW_WIDGET,
    PROP_ESCAPE_VALUES
};

G_DEFINE_TYPE (
    EWebViewPreview,
    e_web_view_preview,
    GTK_TYPE_VPANED);

static void
web_view_preview_set_property (GObject *object,
                               guint property_id,
                               const GValue *value,
                               GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_ESCAPE_VALUES:
            e_web_view_preview_set_escape_values (
                E_WEB_VIEW_PREVIEW (object),
                g_value_get_boolean (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
web_view_preview_get_property (GObject *object,
                               guint property_id,
                               GValue *value,
                               GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_TREE_VIEW:
            g_value_set_object (
                value, e_web_view_preview_get_tree_view (
                E_WEB_VIEW_PREVIEW (object)));
            return;

        case PROP_PREVIEW_WIDGET:
            g_value_set_object (
                value, e_web_view_preview_get_preview (
                E_WEB_VIEW_PREVIEW (object)));
            return;

        case PROP_ESCAPE_VALUES:
            g_value_set_boolean (
                value, e_web_view_preview_get_escape_values (
                E_WEB_VIEW_PREVIEW (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
web_view_preview_dispose (GObject *object)
{
    EWebViewPreviewPrivate *priv;

    priv = E_WEB_VIEW_PREVIEW (object)->priv;

    if (priv->updating_content != NULL) {
        g_string_free (priv->updating_content, TRUE);
        priv->updating_content = NULL;
    }

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

static void
e_web_view_preview_class_init (EWebViewPreviewClass *class)
{
    GObjectClass *object_class;

    g_type_class_add_private (class, sizeof (EWebViewPreviewPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = web_view_preview_set_property;
    object_class->get_property = web_view_preview_get_property;
    object_class->dispose = web_view_preview_dispose;

    g_object_class_install_property (
        object_class,
        PROP_TREE_VIEW,
        g_param_spec_object (
            "tree-view",
            "Tree View",
            NULL,
            GTK_TYPE_TREE_VIEW,
            G_PARAM_READABLE));

    g_object_class_install_property (
        object_class,
        PROP_PREVIEW_WIDGET,
        g_param_spec_object (
            "preview-widget",
            "Preview Widget",
            NULL,
            GTK_TYPE_WIDGET,
            G_PARAM_READABLE));

    g_object_class_install_property (
        object_class,
        PROP_ESCAPE_VALUES,
        g_param_spec_boolean (
            "escape-values",
            "Whether escaping values automatically, when inserting",
            NULL,
            TRUE,
            G_PARAM_READWRITE));
}

static GtkWidget *
in_scrolled_window (GtkWidget *widget)
{
    GtkWidget *sw;

    g_return_val_if_fail (widget != NULL, NULL);

    sw = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
    gtk_container_add (GTK_CONTAINER (sw), widget);

    gtk_widget_show (widget);
    gtk_widget_show (sw);

    return sw;
}

static void
e_web_view_preview_init (EWebViewPreview *preview)
{
    GtkWidget *tree_view_sw, *web_view_sw;

    preview->priv = G_TYPE_INSTANCE_GET_PRIVATE (
        preview, E_TYPE_WEB_VIEW_PREVIEW, EWebViewPreviewPrivate);
    preview->priv->escape_values = TRUE;

    tree_view_sw = in_scrolled_window (gtk_tree_view_new ());
    web_view_sw = in_scrolled_window (e_web_view_new ());

    gtk_widget_hide (tree_view_sw);
    gtk_widget_show (web_view_sw);

    gtk_paned_pack1 (GTK_PANED (preview), tree_view_sw, FALSE, TRUE);
    gtk_paned_pack2 (GTK_PANED (preview), web_view_sw, TRUE, TRUE);

    /* rawly 3 lines of a text plus a little bit more */
    if (gtk_paned_get_position (GTK_PANED (preview)) < 85)
        gtk_paned_set_position (GTK_PANED (preview), 85);
}

GtkWidget *
e_web_view_preview_new (void)
{
    return g_object_new (E_TYPE_WEB_VIEW_PREVIEW, NULL);
}

GtkTreeView *
e_web_view_preview_get_tree_view (EWebViewPreview *preview)
{
    g_return_val_if_fail (preview != NULL, NULL);
    g_return_val_if_fail (E_IS_WEB_VIEW_PREVIEW (preview), NULL);

    return GTK_TREE_VIEW (gtk_bin_get_child (GTK_BIN (gtk_paned_get_child1 (GTK_PANED (preview)))));
}

GtkWidget *
e_web_view_preview_get_preview (EWebViewPreview *preview)
{
    g_return_val_if_fail (preview != NULL, NULL);
    g_return_val_if_fail (E_IS_WEB_VIEW_PREVIEW (preview), NULL);

    return gtk_bin_get_child (GTK_BIN (gtk_paned_get_child2 (GTK_PANED (preview))));
}

void
e_web_view_preview_set_preview (EWebViewPreview *preview,
                                GtkWidget *preview_widget)
{
    GtkWidget *old_child;

    g_return_if_fail (E_IS_WEB_VIEW_PREVIEW (preview));
    g_return_if_fail (GTK_IS_WIDGET (preview_widget));

    old_child = gtk_bin_get_child (GTK_BIN (gtk_paned_get_child2 (GTK_PANED (preview))));
    if (old_child) {
        g_return_if_fail (old_child != preview_widget);
        gtk_widget_destroy (old_child);
    }

    gtk_container_add (GTK_CONTAINER (gtk_paned_get_child2 (GTK_PANED (preview))), preview_widget);
}

void
e_web_view_preview_show_tree_view (EWebViewPreview *preview)
{
    g_return_if_fail (E_IS_WEB_VIEW_PREVIEW (preview));

    gtk_widget_show (gtk_paned_get_child1 (GTK_PANED (preview)));
}

void
e_web_view_preview_hide_tree_view (EWebViewPreview *preview)
{
    g_return_if_fail (E_IS_WEB_VIEW_PREVIEW (preview));

    gtk_widget_hide (gtk_paned_get_child1 (GTK_PANED (preview)));
}

void
e_web_view_preview_set_escape_values (EWebViewPreview *preview,
                                      gboolean escape)
{
    g_return_if_fail (E_IS_WEB_VIEW_PREVIEW (preview));

    preview->priv->escape_values = escape;
}

gboolean
e_web_view_preview_get_escape_values (EWebViewPreview *preview)
{
    g_return_val_if_fail (preview != NULL, FALSE);
    g_return_val_if_fail (E_IS_WEB_VIEW_PREVIEW (preview), FALSE);
    g_return_val_if_fail (preview->priv != NULL, FALSE);

    return preview->priv->escape_values;
}

void
e_web_view_preview_begin_update (EWebViewPreview *preview)
{
    g_return_if_fail (E_IS_WEB_VIEW_PREVIEW (preview));

    if (preview->priv->updating_content) {
        g_warning ("%s: Previous content update isn't finished with e_web_view_preview_end_update()", G_STRFUNC);
        g_string_free (preview->priv->updating_content, TRUE);
    }

    preview->priv->updating_content = g_string_new ("<TABLE width=\"100%\" border=\"0\" cols=\"2\">");
}

void
e_web_view_preview_end_update (EWebViewPreview *preview)
{
    GtkWidget *web_view;

    g_return_if_fail (E_IS_WEB_VIEW_PREVIEW (preview));
    g_return_if_fail (preview->priv->updating_content != NULL);

    g_string_append (preview->priv->updating_content, "</TABLE>");

    web_view = e_web_view_preview_get_preview (preview);
    if (E_IS_WEB_VIEW (web_view))
        e_web_view_load_string (E_WEB_VIEW (web_view), preview->priv->updating_content->str);

    g_string_free (preview->priv->updating_content, TRUE);
    preview->priv->updating_content = NULL;
}

static gchar *
replace_string (const gchar *text,
                const gchar *find,
                const gchar *replace)
{
    const gchar *p, *next;
    GString *str;
    gint find_len;

    g_return_val_if_fail (text != NULL, NULL);
    g_return_val_if_fail (find != NULL, NULL);
    g_return_val_if_fail (*find, NULL);

    find_len = strlen (find);
    str = g_string_new ("");

    p = text;
    while (next = strstr (p, find), next) {
        if (p + 1 < next)
            g_string_append_len (str, p, next - p);

        if (replace && *replace)
            g_string_append (str, replace);

        p = next + find_len;
    }

    g_string_append (str, p);

    return g_string_free (str, FALSE);
}

static gchar *
web_view_preview_escape_text (EWebViewPreview *preview,
                              const gchar *text)
{
    gchar *utf8_valid, *res, *end;

    if (!e_web_view_preview_get_escape_values (preview))
        return NULL;

    g_return_val_if_fail (text != NULL, NULL);

    if (g_utf8_validate (text, -1, NULL)) {
        res = g_markup_escape_text (text, -1);
    } else {
        utf8_valid = g_strdup (text);
        while (end = NULL, !g_utf8_validate (utf8_valid, -1, (const gchar **) &end) && end && *end)
            *end = '?';

        res = g_markup_escape_text (utf8_valid, -1);

        g_free (utf8_valid);
    }

    if (res && strchr (res, '\n')) {
        /* replace line breaks with <BR> */
        if (strchr (res, '\r')) {
            end = replace_string (res, "\r", "");
            g_free (res);
            res = end;
        }

        end = replace_string (res, "\n", "<BR>");
        g_free (res);
        res = end;
    }

    return res;
}

void
e_web_view_preview_add_header (EWebViewPreview *preview,
                               gint index,
                               const gchar *header)
{
    gchar *escaped;

    g_return_if_fail (E_IS_WEB_VIEW_PREVIEW (preview));
    g_return_if_fail (preview->priv->updating_content != NULL);
    g_return_if_fail (header != NULL);

    if (index < 1)
        index = 1;
    else if (index > 6)
        index = 6;

    escaped = web_view_preview_escape_text (preview, header);
    if (escaped)
        header = escaped;

    g_string_append_printf (preview->priv->updating_content, "<TR><TD colspan=2><H%d>%s</H%d></TD></TR>", index, header, index);

    g_free (escaped);
}

void
e_web_view_preview_add_text (EWebViewPreview *preview,
                             const gchar *text)
{
    gchar *escaped;

    g_return_if_fail (E_IS_WEB_VIEW_PREVIEW (preview));
    g_return_if_fail (preview->priv->updating_content != NULL);
    g_return_if_fail (text != NULL);

    escaped = web_view_preview_escape_text (preview, text);
    if (escaped)
        text = escaped;

    g_string_append_printf (preview->priv->updating_content, "<TR><TD colspan=2><FONT size=\"3\">%s</FONT></TD></TR>", text);

    g_free (escaped);
}

void
e_web_view_preview_add_raw_html (EWebViewPreview *preview,
                                 const gchar *raw_html)
{
    g_return_if_fail (E_IS_WEB_VIEW_PREVIEW (preview));
    g_return_if_fail (preview->priv->updating_content != NULL);
    g_return_if_fail (raw_html != NULL);

    g_string_append_printf (preview->priv->updating_content, "<TR><TD colspan=2>%s</TD></TR>", raw_html);
}

void
e_web_view_preview_add_separator (EWebViewPreview *preview)
{
    g_return_if_fail (E_IS_WEB_VIEW_PREVIEW (preview));
    g_return_if_fail (preview->priv->updating_content != NULL);

    g_string_append (preview->priv->updating_content, "<TR><TD colspan=2><HR></TD></TR>");
}

void
e_web_view_preview_add_empty_line (EWebViewPreview *preview)
{
    g_return_if_fail (E_IS_WEB_VIEW_PREVIEW (preview));
    g_return_if_fail (preview->priv->updating_content != NULL);

    g_string_append (preview->priv->updating_content, "<TR><TD colspan=2>&nbsp;</TD></TR>");
}

/* section can be NULL, but value cannot */
void
e_web_view_preview_add_section (EWebViewPreview *preview,
                                const gchar *section,
                                const gchar *value)
{
    gchar *escaped_section = NULL, *escaped_value;

    g_return_if_fail (E_IS_WEB_VIEW_PREVIEW (preview));
    g_return_if_fail (preview->priv->updating_content != NULL);
    g_return_if_fail (value != NULL);

    if (section) {
        escaped_section = web_view_preview_escape_text (preview, section);
        if (escaped_section)
            section = escaped_section;
    }

    escaped_value = web_view_preview_escape_text (preview, value);
    if (escaped_value)
        value = escaped_value;

    g_string_append_printf (preview->priv->updating_content, "<TR><TD width=\"10%%\" valign=\"top\" nowrap><FONT size=\"3\"><B>%s</B></FONT></TD><TD width=\"90%%\"><FONT size=\"3\">%s</FONT></TD></TR>", section ? section : "", value);

    g_free (escaped_section);
    g_free (escaped_value);
}