static gboolean
gnc_plugin_page_invoice_focus (InvoiceWindow *iw)
{
    GtkWidget *regWidget = gnc_invoice_get_register(iw);
    GtkWidget *notes = gnc_invoice_get_notes(iw);
    GnucashSheet *sheet;

    if (!GNUCASH_IS_REGISTER(regWidget))
        return FALSE;

    sheet = gnucash_register_get_sheet (GNUCASH_REGISTER(regWidget));

    // Test for the sheet being read only
    if (!gnucash_sheet_is_read_only (sheet))
    {
        if (!gtk_widget_is_focus (GTK_WIDGET(sheet)))
            gtk_widget_grab_focus (GTK_WIDGET(sheet));
    }
    else // set focus to the notes field
    {
        if (!gtk_widget_is_focus (GTK_WIDGET(notes)))
            gtk_widget_grab_focus (GTK_WIDGET(notes));
    }
    return FALSE;
}
static void
gnc_plugin_page_invoice_refresh_cb (GHashTable *changes, gpointer user_data)
{
    GncPluginPageInvoice *page = user_data;
    GncPluginPageInvoicePrivate *priv;
    GtkWidget *reg;

    g_return_if_fail(GNC_IS_PLUGIN_PAGE_INVOICE(page));

    /* We're only looking for forced updates here. */
    if (changes)
        return;

    priv = GNC_PLUGIN_PAGE_INVOICE_GET_PRIVATE(page);
    reg = gnc_invoice_get_register(priv->iw);
    gnucash_register_refresh_from_prefs(GNUCASH_REGISTER(reg));
    gtk_widget_queue_draw(priv->widget);
}
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 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;
}