/* gtkmm example Copyright (C) 2002 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 <gtkmm.h>
#include "cellrendererlist.h"
#include "popupentry.h"


namespace
{

struct PopupColumns : public Gtk::TreeModel::ColumnRecord
{
  Gtk::TreeModelColumn<Glib::ustring> item;
  PopupColumns() { add(item); }
};

const PopupColumns& popup_columns()
{
  static const PopupColumns columns;
  return columns;
}

} // anonymous namespace


CellRendererList::CellRendererList()
:
  Glib::ObjectBase  (typeid(CellRendererList)),
  CellRendererPopup (),
  list_store_       (Gtk::ListStore::create(popup_columns())),
  tree_view_        (list_store_)
{
  tree_view_.set_headers_visible(false);
  tree_view_.append_column("", popup_columns().item);
  tree_view_.signal_button_release_event().connect(
      sigc::mem_fun(*this, &Self::on_tree_view_button_release_event));

  const auto selection = tree_view_.get_selection();
  selection->set_mode(Gtk::SELECTION_BROWSE);
  selection->signal_changed().connect(sigc::mem_fun(*this, &Self::on_tree_selection_changed));

  Gtk::Frame *const frame = Gtk::make_managed<Gtk::Frame>();
  get_popup_window()->add(*frame);

  frame->add(tree_view_);
  frame->set_shadow_type(Gtk::SHADOW_OUT);
  frame->show_all();

  set_focus_widget(tree_view_);
}

CellRendererList::~CellRendererList()
{}

void CellRendererList::append_list_item(const Glib::ustring& text)
{
  Gtk::TreeModel::Row row = *list_store_->append();
  row[popup_columns().item] = text;
}

Glib::ustring CellRendererList::get_selected_item()
{
  if(const Gtk::TreeModel::iterator selected = tree_view_.get_selection()->get_selected())
  {
    return (*selected)[popup_columns().item];
  }

  return Glib::ustring();
}

void CellRendererList::on_show_popup(const Glib::ustring& path, int x1, int y1, int x2, int y2)
{
  tree_view_.set_size_request(x2 - x1, -1);

  CellRendererPopup::on_show_popup(path, x1, y1, x2, y2);
}

bool CellRendererList::on_tree_view_button_release_event(GdkEventButton* event)
{
  if(event->button == 1)
  {
    hide_popup();
    return true;
  }

  return false;
}

void CellRendererList::on_tree_selection_changed()
{
  get_popup_entry()->set_text(get_selected_item());
}
