/* gtkmm example Copyright (C) 2011 gtkmm development team
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, see <https://www.gnu.org/licenses/>.
 */

#include "examplewindow.h"
#include <iostream>

ExampleWindow::ExampleWindow()
{
  add(m_container);
  set_title("Event Propagation");
  set_border_width(10);

  m_label.set_label("A label");
  m_checkbutton_can_propagate.set_label("Can Propagate");
  m_checkbutton_can_propagate.set_active();

  // Main Container
  m_container.set_orientation(Gtk::ORIENTATION_VERTICAL);
  m_container.add(m_label);
  m_container.add(m_entry);
  m_container.add(m_checkbutton_can_propagate);

  // Events
  add_events(Gdk::KEY_RELEASE_MASK);

  m_entry.signal_key_release_event().connect(
    sigc::mem_fun(*this, &ExampleWindow::entryKeyRelease));

  m_container.signal_key_release_event().connect(
    sigc::mem_fun(*this, &ExampleWindow::gridKeyRelease));

  // Called before the default event signal handler.
  signal_key_release_event().connect(
    sigc::mem_fun(*this, &ExampleWindow::windowKeyReleaseBefore), false);

  // Called after the default event signal handler.
  signal_key_release_event().connect(
    sigc::mem_fun(*this, &ExampleWindow::windowKeyRelease));

  show_all_children();
}

//By changing the return value we allow, or don't allow, the event to propagate to other elements.
bool ExampleWindow::entryKeyRelease(GdkEventKey* /* event */ )
{
  std::cout << "Entry" << std::endl;

  if(m_checkbutton_can_propagate.get_active())
  {
    return false;
  }

  return true;
}

bool ExampleWindow::gridKeyRelease(GdkEventKey* /* event */ )
{
  std::cout << "Grid" << std::endl;

  //Let it propagate:
  return false;
}

bool ExampleWindow::windowKeyReleaseBefore(GdkEventKey* /* event */ )
{
  std::cout << "Window before" << std::endl;
  return false;
}

bool ExampleWindow::on_key_release_event(GdkEventKey* key_event)
{
  std::cout << "Window overridden" << std::endl;

  // call base class function (to get the normal behaviour)
  return Gtk::Window::on_key_release_event(key_event);
}

// This will set the entry's text in the label, every time a key is pressed.
bool ExampleWindow::windowKeyRelease(GdkEventKey* /* event */ )
{
  std::cout << "Window after";

  //checking if the entry is on focus, otherwise the label would get changed by pressing keys
  //on the window (when the entry is not on focus), even if m_checkbutton_can_propagate wasn't active
  if(m_entry.has_focus())
  {
    m_label.set_text(m_entry.get_text());
    std::cout << ", " << m_entry.get_text();
  }
  std::cout << std::endl;

  return true;
}

ExampleWindow::~ExampleWindow()
{
}

