/**
 * Whenever the current page is changed, if an invoice page is
 * the current page, set focus on the sheet or notes field.
 */
static void
gnc_plugin_page_invoice_main_window_page_changed (GncMainWindow *window,
        GncPluginPage *plugin_page, gpointer user_data)
{
    // We continue only if the plugin_page is a valid
    if (!plugin_page || !GNC_IS_PLUGIN_PAGE(plugin_page))
        return;

    if (gnc_main_window_get_current_page (window) == plugin_page)
    {
        GncPluginPageInvoice *page;
        GncPluginPageInvoicePrivate *priv;

        if (!GNC_IS_PLUGIN_PAGE_INVOICE(plugin_page))
            return;

        page = GNC_PLUGIN_PAGE_INVOICE(plugin_page);
        priv = GNC_PLUGIN_PAGE_INVOICE_GET_PRIVATE(page);

        // The page changed signal is emitted multiple times so we need
        // to use an idle_add to change the focus to the sheet
        g_idle_remove_by_data (priv->iw);
        g_idle_add ((GSourceFunc)gnc_plugin_page_invoice_focus, priv->iw);
    }
}
static void
gnc_plugin_page_invoice_summarybar_position_changed(GConfEntry *entry,
        gpointer user_data)
{
    GncPluginPage *plugin_page;
    GncPluginPageInvoice *page;
    GncPluginPageInvoicePrivate *priv;
    GtkPositionType position = GTK_POS_BOTTOM;
    gchar *conf_string;

    g_return_if_fail(user_data != NULL);

    plugin_page = GNC_PLUGIN_PAGE(user_data);
    page = GNC_PLUGIN_PAGE_INVOICE (user_data);
    priv = GNC_PLUGIN_PAGE_INVOICE_GET_PRIVATE(page);

    conf_string = gnc_gconf_get_string (GCONF_GENERAL,
                                        KEY_SUMMARYBAR_POSITION, NULL);
    if (conf_string)
    {
        position = gnc_enum_from_nick (GTK_TYPE_POSITION_TYPE,
                                       conf_string, GTK_POS_BOTTOM);
        g_free (conf_string);
    }

    gtk_box_reorder_child(GTK_BOX(priv->widget),
                          plugin_page->summarybar,
                          (position == GTK_POS_TOP ? 0 : -1) );
}
static void
gnc_plugin_page_invoice_destroy_widget (GncPluginPage *plugin_page)
{
    GncPluginPageInvoice *page;
    GncPluginPageInvoicePrivate *priv;

    ENTER("page %p", plugin_page);
    page = GNC_PLUGIN_PAGE_INVOICE (plugin_page);
    priv = GNC_PLUGIN_PAGE_INVOICE_GET_PRIVATE(page);

    gnc_gconf_general_remove_cb(KEY_SUMMARYBAR_POSITION,
                                gnc_plugin_page_invoice_summarybar_position_changed, page);

    if (priv->widget == NULL)
    {
        LEAVE("");
        return;
    }

    if (priv->component_manager_id)
    {
        gnc_unregister_gui_component(priv->component_manager_id);
        priv->component_manager_id = 0;
    }

    gtk_widget_hide(priv->widget);
    gnc_invoice_window_destroy_cb(priv->widget, priv->iw);
    priv->widget = NULL;
    LEAVE("");
}
static void
gnc_plugin_page_invoice_window_changed (GncPluginPage *plugin_page,
                                        GtkWidget *window)
{
    GncPluginPageInvoice *page;
    GncPluginPageInvoicePrivate *priv;

    g_return_if_fail (GNC_IS_PLUGIN_PAGE_INVOICE (plugin_page));

    page = GNC_PLUGIN_PAGE_INVOICE(plugin_page);
    priv = GNC_PLUGIN_PAGE_INVOICE_GET_PRIVATE(page);
    gnc_invoice_window_changed (priv->iw, window);
}
void
gnc_plugin_page_invoice_update_title (GncPluginPage *plugin_page)
{
    GncPluginPageInvoice *page;
    GncPluginPageInvoicePrivate *priv;
    gchar *title;

    g_return_if_fail(GNC_IS_PLUGIN_PAGE_INVOICE(plugin_page));

    page = GNC_PLUGIN_PAGE_INVOICE(plugin_page);
    priv = GNC_PLUGIN_PAGE_INVOICE_GET_PRIVATE(page);
    title = gnc_invoice_get_title(priv->iw);
    main_window_update_page_name(plugin_page, title);
    g_free(title);
}
static GtkWidget *
gnc_plugin_page_invoice_create_widget (GncPluginPage *plugin_page)
{
    GncPluginPageInvoice *page;
    GncPluginPageInvoicePrivate *priv;
    GtkWidget *regWidget, *widget;

    ENTER("page %p", plugin_page);
    page = GNC_PLUGIN_PAGE_INVOICE (plugin_page);
    priv = GNC_PLUGIN_PAGE_INVOICE_GET_PRIVATE(page);
    if (priv->widget != NULL)
    {
        LEAVE("");
        return priv->widget;
    }

    priv->widget = gtk_vbox_new (FALSE, 0);
    gtk_widget_show (priv->widget);

    widget = gnc_invoice_create_page(priv->iw, page);
    gtk_widget_show (widget);
    gtk_box_pack_start(GTK_BOX (priv->widget), widget, TRUE, TRUE, 0);

    plugin_page->summarybar = gnc_invoice_window_create_summary_bar(priv->iw);
    gtk_box_pack_start(GTK_BOX (priv->widget), plugin_page->summarybar, FALSE, FALSE, 0);
    gnc_plugin_page_invoice_summarybar_position_changed(NULL, page);
    gnc_gconf_general_register_cb(KEY_SUMMARYBAR_POSITION,
                                  gnc_plugin_page_invoice_summarybar_position_changed, page);

    regWidget = gnc_invoice_get_register(priv->iw);
    if (regWidget)
    {
        g_signal_connect (G_OBJECT (regWidget), "redraw-help",
                          G_CALLBACK (gnc_plugin_page_redraw_help_cb), page);
    }

    priv->component_manager_id =
        gnc_register_gui_component(GNC_PLUGIN_PAGE_INVOICE_NAME,
                                   gnc_plugin_page_invoice_refresh_cb,
                                   NULL, page);

    LEAVE("");
    return priv->widget;
}
static void
gnc_plugin_page_invoice_summarybar_position_changed(gpointer prefs, gchar *pref, gpointer user_data)
{
    GncPluginPage *plugin_page;
    GncPluginPageInvoice *page;
    GncPluginPageInvoicePrivate *priv;
    GtkPositionType position = GTK_POS_BOTTOM;

    g_return_if_fail(user_data != NULL);

    plugin_page = GNC_PLUGIN_PAGE(user_data);
    page = GNC_PLUGIN_PAGE_INVOICE (user_data);
    priv = GNC_PLUGIN_PAGE_INVOICE_GET_PRIVATE(page);

    if (gnc_prefs_get_bool (GNC_PREFS_GROUP_GENERAL, GNC_PREF_SUMMARYBAR_POSITION_TOP))
        position = GTK_POS_TOP;

    gtk_box_reorder_child(GTK_BOX(priv->widget),
                          plugin_page->summarybar,
                          (position == GTK_POS_TOP ? 0 : -1) );
}
/** Save enough information about this invoice page that it can be
 *  recreated next time the user starts gnucash.
 *
 *  @param page The page to save.
 *
 *  @param key_file A pointer to the GKeyFile data structure where the
 *  page information should be written.
 *
 *  @param group_name The group name to use when saving data. */
static void
gnc_plugin_page_invoice_save_page (GncPluginPage *plugin_page,
                                   GKeyFile *key_file,
                                   const gchar *group_name)
{
    GncPluginPageInvoice *invoice;
    GncPluginPageInvoicePrivate *priv;

    g_return_if_fail (GNC_IS_PLUGIN_PAGE_INVOICE(plugin_page));
    g_return_if_fail (key_file != NULL);
    g_return_if_fail (group_name != NULL);

    ENTER("page %p, key_file %p, group_name %s", plugin_page, key_file,
          group_name);

    invoice = GNC_PLUGIN_PAGE_INVOICE(plugin_page);
    priv = GNC_PLUGIN_PAGE_INVOICE_GET_PRIVATE(invoice);

    gnc_invoice_save_page(priv->iw, key_file, group_name);
    LEAVE(" ");
}
static void
gnc_plugin_page_invoice_destroy_widget (GncPluginPage *plugin_page)
{
    GncPluginPageInvoice *page;
    GncPluginPageInvoicePrivate *priv;

    ENTER("page %p", plugin_page);
    page = GNC_PLUGIN_PAGE_INVOICE (plugin_page);
    priv = GNC_PLUGIN_PAGE_INVOICE_GET_PRIVATE(page);

    gnc_prefs_remove_cb_by_func (GNC_PREFS_GROUP_GENERAL,
                                 GNC_PREF_SUMMARYBAR_POSITION_TOP,
                                 gnc_plugin_page_invoice_summarybar_position_changed,
                                 page);
    gnc_prefs_remove_cb_by_func (GNC_PREFS_GROUP_GENERAL,
                                 GNC_PREF_SUMMARYBAR_POSITION_BOTTOM,
                                 gnc_plugin_page_invoice_summarybar_position_changed,
                                 page);

    // Remove the page focus idle function if present
    g_idle_remove_by_data (priv->iw);

    if (priv->widget == NULL)
    {
        LEAVE("");
        return;
    }

    if (priv->component_manager_id)
    {
        gnc_unregister_gui_component(priv->component_manager_id);
        priv->component_manager_id = 0;
    }

    gtk_widget_hide(priv->widget);
    gnc_invoice_window_destroy_cb(priv->widget, priv->iw);
    priv->widget = NULL;
    LEAVE("");
}
static GtkWidget *
gnc_plugin_page_invoice_create_widget (GncPluginPage *plugin_page)
{
    GncPluginPageInvoice *page;
    GncPluginPageInvoicePrivate *priv;
    GtkWidget *regWidget, *widget;
    GncMainWindow  *window;

    ENTER("page %p", plugin_page);
    page = GNC_PLUGIN_PAGE_INVOICE (plugin_page);
    priv = GNC_PLUGIN_PAGE_INVOICE_GET_PRIVATE(page);
    if (priv->widget != NULL)
    {
        LEAVE("");
        return priv->widget;
    }

    priv->widget = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
    gtk_box_set_homogeneous (GTK_BOX (priv->widget), FALSE);

    // Set the style context for this page so it can be easily manipulated with css
    gnc_widget_set_style_context (GTK_WIDGET(priv->widget), "GncInvoicePage");

    gtk_widget_show (priv->widget);

    widget = gnc_invoice_create_page(priv->iw, page);
    gtk_widget_show (widget);
    gtk_box_pack_start(GTK_BOX (priv->widget), widget, TRUE, TRUE, 0);

    plugin_page->summarybar = gnc_invoice_window_create_summary_bar(priv->iw);
    gtk_box_pack_start(GTK_BOX (priv->widget), plugin_page->summarybar, FALSE, FALSE, 0);
    gnc_plugin_page_invoice_summarybar_position_changed(NULL, NULL, page);
    gnc_prefs_register_cb (GNC_PREFS_GROUP_GENERAL,
                           GNC_PREF_SUMMARYBAR_POSITION_TOP,
                           gnc_plugin_page_invoice_summarybar_position_changed,
                           page);
    gnc_prefs_register_cb (GNC_PREFS_GROUP_GENERAL,
                           GNC_PREF_SUMMARYBAR_POSITION_BOTTOM,
                           gnc_plugin_page_invoice_summarybar_position_changed,
                           page);

    regWidget = gnc_invoice_get_register(priv->iw);
    if (regWidget)
    {
        g_signal_connect (G_OBJECT (regWidget), "redraw-help",
                          G_CALLBACK (gnc_plugin_page_redraw_help_cb), page);
    }

    priv->component_manager_id =
        gnc_register_gui_component(GNC_PLUGIN_PAGE_INVOICE_NAME,
                                   gnc_plugin_page_invoice_refresh_cb,
                                   NULL, page);

    window = GNC_MAIN_WINDOW(GNC_PLUGIN_PAGE(plugin_page)->window);
    g_signal_connect(window, "page_changed",
                     G_CALLBACK(gnc_plugin_page_invoice_main_window_page_changed),
                     plugin_page);

    LEAVE("");
    return priv->widget;
}