/* Copyright (C) 2003 The gtkmm Development Team
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <https://www.gnu.org/licenses/>.
 */

#include <gtkmm/widget.h>
#include <gtkmm/celllayout.h>
#include <gtkmm/treemodel.h>

_DEFS(gtkmm,gtk)
_PINCLUDE(glibmm/private/object_p.h)


namespace Gtk
{

class GTKMM_API Entry;

/** Completion functionality for Gtk::Entry.
 *
 * Gtk::EntryCompletion is an auxiliary object to be used in conjunction with
 * Gtk::Entry to provide the completion functionality.
 *
 * It derives from Gtk::CellLayout, to allow the user to add extra cells to the Gtk::TreeView with completion matches.
 *
 * "Completion functionality" means that when the user modifies the text in the
 * entry, Gtk::EntryCompletion checks which rows in the model match the current
 * content of the entry, and displays a list of matches. By default, the
 * matching is done by comparing the entry text case-insensitively against
 * the text column of the model (see set_text_column()),
 * but this can be overridden with a custom match function (see set_match_func()).
 *
 * When the user selects a completion, the content of the entry is updated.
 * By default, the content of the entry is replaced by the text column of the
 * model, but this can be overridden by connecting to the match_selected signal
 * and updating the entry in the signal handler. Note that you should return true
 * from the signal handler to suppress the default behaviour.
 *
 * To add completion functionality to an entry, use Gtk::Entry::set_completion().
 *
 * In addition to regular completion matches, which will be inserted into
 * the entry when they are selected, Gtk::EntryCompletion also allows the display of
 * "actions" in the popup window. Their appearance is similar to menu items,
 * to differentiate them clearly from completion strings. When an action is
 * selected, the action_activated signal is emitted.
 */
class GTKMM_API EntryCompletion
 : public Glib::Object,
   public Gtk::CellLayout,
   public Gtk::Buildable
{
  _CLASS_GOBJECT(EntryCompletion, GtkEntryCompletion, GTK_ENTRY_COMPLETION, Glib::Object, GObject, , , GTKMM_API)
  _IMPLEMENTS_INTERFACE(CellLayout)
  _IMPLEMENTS_INTERFACE(Buildable)

protected:
  _CTOR_DEFAULT()

public:
  _WRAP_CREATE()

  //Careful, this actually returns a GtkWidget*, so it might not always be a GtkEntry in future GTK+ versions.
  _WRAP_METHOD(Entry* get_entry(), gtk_entry_completion_get_entry)
  _WRAP_METHOD(const Entry* get_entry() const, gtk_entry_completion_get_entry)

  _WRAP_METHOD(void set_model(const Glib::RefPtr<TreeModel>& model), gtk_entry_completion_set_model)
  _WRAP_METHOD(Glib::RefPtr<TreeModel> get_model(), gtk_entry_completion_get_model, refreturn)
  _WRAP_METHOD(Glib::RefPtr<const TreeModel> get_model() const, gtk_entry_completion_get_model, refreturn, constversion)

  /** Remove the model from the EntryCompletion.
   *
   * @see set_model().
   *
   * @newin{2,16}
   */
  void unset_model();

  /// For example, bool on_match(const Glib::ustring& key, const TreeModel::const_iterator& iter);
  typedef sigc::slot<bool, const Glib::ustring&, const TreeModel::const_iterator&> SlotMatch;

  void set_match_func(const SlotMatch& slot);
  _IGNORE(gtk_entry_completion_set_match_func)

  _WRAP_METHOD(void set_minimum_key_length(int length), gtk_entry_completion_set_minimum_key_length)
  _WRAP_METHOD(int get_minimum_key_length() const, gtk_entry_completion_get_minimum_key_length)
  _WRAP_METHOD(Glib::ustring compute_prefix(const Glib::ustring& key), gtk_entry_completion_compute_prefix)
  _WRAP_METHOD(void complete(), gtk_entry_completion_complete)

  _WRAP_METHOD(void insert_prefix(), gtk_entry_completion_insert_prefix)

  //We reordered the parameters, compared to the C version, so that we can have method overloads without the index.

  // TODO: We would really like an insert() which before-inserts an iterator, like ListStore::insert(),
  // but there is no EntryCompletion::insert_before() for us to use.
  void insert_action_text(const Glib::ustring& text, int index);
  void prepend_action_text(const Glib::ustring& text);
  //TODO: Add append_action_text() somehow? It would be slow if we count the children each time. murrayc.
  _IGNORE(gtk_entry_completion_insert_action_text)
  void insert_action_markup(const Glib::ustring& markup, int index);
  void prepend_action_markup(const Glib::ustring& markup);
  _IGNORE(gtk_entry_completion_insert_action_markup)

  //TODO: Change default - it would be nicer to delete the last action instead of the first.
  _WRAP_METHOD(void delete_action(int index = 0), gtk_entry_completion_delete_action)

  _WRAP_METHOD(void set_inline_completion(bool inline_completion = true), gtk_entry_completion_set_inline_completion)
  _WRAP_METHOD(bool get_inline_completion() const, gtk_entry_completion_get_inline_completion)
  _WRAP_METHOD(void set_inline_selection(bool inline_selection = true), gtk_entry_completion_set_inline_selection)
  _WRAP_METHOD(bool get_inline_selection() const, gtk_entry_completion_get_inline_selection)
  _WRAP_METHOD(void set_popup_completion(bool popup_completion = true), gtk_entry_completion_set_popup_completion)
  _WRAP_METHOD(bool get_popup_completion() const, gtk_entry_completion_get_popup_completion)

  _WRAP_METHOD(void set_popup_set_width(bool popup_set_width = true), gtk_entry_completion_set_popup_set_width)
  _WRAP_METHOD(bool get_popup_set_width() const, gtk_entry_completion_get_popup_set_width)

  _WRAP_METHOD(void set_popup_single_match(bool popup_single_match = true), gtk_entry_completion_set_popup_single_match)

  _WRAP_METHOD(bool get_popup_single_match() const, gtk_entry_completion_get_popup_single_match)
  _WRAP_METHOD(Glib::ustring get_completion_prefix() const, gtk_entry_completion_get_completion_prefix)

  _WRAP_METHOD(void set_text_column(const TreeModelColumnBase& column), gtk_entry_completion_set_text_column)
  _WRAP_METHOD(void set_text_column(int column), gtk_entry_completion_set_text_column)
  _WRAP_METHOD(int get_text_column() const, gtk_entry_completion_get_text_column)

  _WRAP_SIGNAL(void action_activated(int index), action_activated)

  //We completely hand-code these signals because we want to change how the parameters are wrapped,
  //because we need both the iter and the model to make the C++ iter.
  _IGNORE_SIGNAL(match_selected)
  _IGNORE_SIGNAL(cursor_on_match)

  /** Emitted when a match from the list is selected.
   * The default behaviour is to replace the contents of the
   * entry with the contents of the text column in the row
   * pointed to by @a iter.
   *
   * It is necessary to connect your signal handler <i>before</i>
   * the default one, which would otherwise return <tt>true</tt>,
   * a value which signifies that the signal has been handled,
   * thus preventing any other handler from being invoked.
   *
   * To do this, pass <tt>false</tt> to this signal proxy's
   * <tt>connect()</tt> method. For example:
   * <tt> completion->signal_match_selected().connect(sigc::mem_fun(*this, &YourClass::on_completion_match_selected), false); </tt>
   *
   * @param model The TreeModel containing the matches
   * @param iter A TreeModel::iterator positioned at the selected match
   * @result true if the signal has been handled
   *
   * @par Prototype:
   * <tt>bool %on_match_selected(const TreeModel::iterator& iter)</tt>
   */
  Glib::SignalProxy1< bool, const TreeModel::iterator& > signal_match_selected();

  /** Emitted when a match from the cursor is on a match
   * of the list. The default behaviour is to replace the contents
   * of the entry with the contents of the text column in the row
   * pointed to by @a iter.
   *
   * @param model The TreeModel containing the matches
   * @param iter A TreeModel::iterator positioned at the selected match
   * @result true if the signal has been handled
   *
   * @par Prototype:
   * <tt>bool %on_cursor_on_match(const TreeModel::iterator& iter)</tt>
   *
   * @newin{2,12}
   */
  Glib::SignalProxy1< bool, const TreeModel::iterator& > signal_cursor_on_match();


  #m4begin
dnl// Hook in custom callback.
dnl// It will use the callback.
dnl
  _PUSH(SECTION_PCC_CLASS_INIT_DEFAULT_SIGNAL_HANDLERS)
    klass->match_selected = &match_selected_callback_custom;
  _SECTION(SECTION_PH_DEFAULT_SIGNAL_HANDLERS)
    static gboolean match_selected_callback_custom(GtkEntryCompletion* self, GtkTreeModel* c_model, GtkTreeIter* c_iter);
  _POP()
#m4end

#m4 _CONVERSION(`const char*',`const Glib::ustring&',__GCHARP_TO_USTRING)


  _WRAP_SIGNAL(bool insert_prefix(const Glib::ustring& prefix), insert_prefix)

  //TODO: Remove no_default_handler when we can break ABI.
  _WRAP_SIGNAL(void no_matches(), no_matches, no_default_handler)


  _WRAP_PROPERTY("model", Glib::RefPtr<Gtk::TreeModel>)
  _WRAP_PROPERTY("minimum_key_length", int)
  _WRAP_PROPERTY("text_column", int)
  _WRAP_PROPERTY("inline_completion", bool)
  _WRAP_PROPERTY("popup_completion", bool)
  _WRAP_PROPERTY("popup_set_width", bool)
  _WRAP_PROPERTY("popup_single_match", bool)
  _WRAP_PROPERTY("inline-selection", bool)
  _WRAP_PROPERTY("cell-area", Glib::RefPtr<CellArea>)

protected:

  //Default Signal Handler:
  virtual bool on_match_selected(const TreeModel::iterator& iter);
  //No default handler for on_cursor_on_match(), to preserve ABI. TODO: Add this when we can break ABI.
};

} // namespace Gtk
