examplewindow.cc

Developing with Gnome一书examples例子代码

#include "ExampleWindow.h"

ExampleWindow::ExampleWindow(
  BaseObjectType* base_object,
  const Glib::RefPtr<Gnome::Glade::Xml>& glade_xml)
  : Gtk::Window(base_object)
{
  // Get the GConf::Client, tell it we want to monitor /apps/metacity/general
  d_conf_client = Gnome::Conf::Client::get_default_client();
  d_conf_client->add_dir("/apps/metacity/general");

  // Get the check_button
  glade_xml->get_widget("Reduced Resources", d_checkbutton);

  // Connect the check_button to a callback that can toggle it when the option
  // is changed by some outside program.
  d_conf_client->notify_add("/apps/metacity/general/reduced_resources",
                            sigc::mem_fun(*this, &ExampleWindow::key_changed));

  // Connect the check_button's clicked callback up so that it can change the
  // gconf setting.
  d_checkbutton->signal_clicked().connect(
    sigc::mem_fun(*this, &ExampleWindow::checkbutton_toggled) );

  // Determine whether button should start activated or not
  d_old_setting = 
    d_conf_client->get_bool("/apps/metacity/general/reduced_resources");
  d_checkbutton->set_active(d_old_setting);

  // Get the close button and connect it to hide
  Gtk::Button* close_button;
  glade_xml->get_widget("CloseButton", close_button);
  close_button->signal_clicked().connect(
    sigc::mem_fun(*this, &Gtk::Widget::hide));
}

ExampleWindow::~ExampleWindow()
{
}

void
ExampleWindow::key_changed(guint connection_id, Gnome::Conf::Entry entry)
{
  // Make sure the preference has a valid value
  if (entry.get_value().get_type() == Gnome::Conf::VALUE_BOOL) {
    // Get the new value
    bool new_setting = entry.get_value().get_bool();

    // Try to handle asynchronous-ness of GConf and prevent calling
    // checkbutton_toggled again if this function was called as a
    // result of the d_conf_client->set() function call.
    if (new_setting != d_old_setting) {
      d_old_setting = new_setting;
      d_checkbutton->set_active(new_setting);
    }
  }
}

void
ExampleWindow::checkbutton_toggled()
{
  // Determine whether the checkbutton is already set or not
  bool is_set = d_checkbutton->get_active();
 
  // Try to handle asynchronous-ness of GConf and prevent calling
  // key_changed again if this function was called as a result of the
  // d_checkbutton->set_active() function call.
  if (is_set != d_old_setting) {
    d_old_setting = is_set;
    d_conf_client->set("/apps/metacity/general/reduced_resources", is_set);
  }
}