/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
 *
 *                                                         Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
 *                                               .)j(] .d_/ '-(  P .   S
 * License: (BSD)                                <Td/Z <fP"5(\"??"\a.  .L
 * Redistribution and use in source and          _dV>ws?a-?'      ._/L  #'
 * binary forms, with or without                 )4d[#7r, .   '     )d`)[
 * modification, are permitted provided         _Q-5'5W..j/?'   -?!\)cam'
 * that the following conditions are met:       j<<WP+k/);.        _W=j f
 * 1. Redistributions of source code must       .$%w\/]Q  . ."'  .  mj$
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 */

#ifndef GCN_LISTBOX_HPP
#define GCN_LISTBOX_HPP

#include <list>

#include "guisan/keylistener.hpp"
#include "guisan/listmodel.hpp"
#include "guisan/mouselistener.hpp"
#include "guisan/platform.hpp"
#include "guisan/widget.hpp"

namespace gcn
{
    class SelectionListener;

    /**
     * An implementation of a list box where an item can be selected.
     *
     * To be able to display a list the list box uses a user provided list model.
     * A list model can be any class that implements the ListModel interface.
     *
     * If an item is selected in the list box a select event will be sent to
     * all selection listeners of the list box. If an item is selected by using
     * a mouse click or by using the enter or space key an action event will be
     * sent to all action listeners of the list box.
     */
    class GCN_CORE_DECLSPEC ListBox :
        public Widget,
        public MouseListener,
        public KeyListener
    {
    public:
        /**
         * Constructor.
         */
        ListBox();

        /**
         * Constructor.
         *
         * @param listModel the list model to use.
         */
        ListBox(ListModel *listModel);

        /**
         * Destructor.
         */
        ~ListBox() override {}

        /**
         * Gets the selected item as an index in the list model.
         *
         * @return the selected item as an index in the list model.
         * @see setSelected
         */
        int getSelected() const;

         /**
         * Sets the selected item. The selected item is represented by
         * an index from the list model.
         *
         * @param selected the selected item as an index from the list model.
         * @see getSelected
         */
        void setSelected(int selected);

        /**
         * Sets the list model to use.
         *
         * @param listModel the list model to use.
         * @see getListModel
         */
        void setListModel(ListModel *listModel);

        /**
         * Gets the list model used.
         *
         * @return the list model used.
         * @see setListModel
         */
        ListModel *getListModel();

        /**
         * Adjusts the size of the list box to fit its list model.
         */
        void adjustSize();

        /**
         * Checks whether the list box wraps when selecting items
         * with a keyboard.
         *
         * Wrapping means that the selection of items will be wrapped.
         * That is, if the first item is selected and up is pressed,
         * the last item will get selected. If the last item is selected
         * and down is pressed, the first item will get selected.
         *
         * @return true if wrapping is enabled, false otherwise.
         * @see setWrappingEnabled
         */
        bool isWrappingEnabled() const;

        /**
         * Sets the list box to wrap or not when selecting items
         * with a keyboard.
         *
         * Wrapping means that the selection of items will be wrapped.
         * That is, if the first item is selected and up is pressed,
         * the last item will get selected. If the last item is selected
         * and down is pressed, the first item will get selected.
         *
         * @see isWrappingEnabled
         */
        void setWrappingEnabled(bool wrappingEnabled);

        /**
         * Adds a selection listener to the list box. When the selection
         * changes an event will be sent to all selection listeners of the
         * list box.
         *
         * @param selectionListener The selection listener to add.
         * @since 0.8.0
         */
        void addSelectionListener(SelectionListener* selectionListener);

        /**
         * Removes a selection listener from the list box.
         *
         * @param selectionListener The selection listener to remove.
         * @since 0.8.0
         */
        void removeSelectionListener(SelectionListener* selectionListener);

        /**
         * Gets the height of a row. Should be overridden if another row
         * height than the font height is preferred.
         *
         * @return The height of a row.
         * @since 1.1.0
         */
        virtual unsigned int getRowHeight() const;

        // Inherited from Widget

        void draw(Graphics* graphics) override;
        void logic() override;

        // Inherited from KeyListener

        void keyPressed(KeyEvent& keyEvent) override;

        // Inherited from MouseListener

        void mousePressed(MouseEvent& mouseEvent) override;
        void mouseWheelMovedUp(MouseEvent& mouseEvent) override;
        void mouseWheelMovedDown(MouseEvent& mouseEvent) override;
        void mouseDragged(MouseEvent& mouseEvent) override;

    protected:
        /**
         * Distributes a value changed event to all selection listeners
         * of the list box.
         *
         * @since 0.8.0
         */
        void distributeValueChangedEvent();

        /**
         * The list model to use.
         */
        ListModel *mListModel = nullptr;

        /**
         * The selected item as an index in the list model.
         */
        int mSelected = -1;

        /**
         * True if wrapping is enabled, false otherwise.
         */
        bool mWrappingEnabled = false;

        typedef std::list<SelectionListener*> SelectionListenerList;

        /**
         * The selection listeners of the list box.
         */
        SelectionListenerList mSelectionListeners;

        typedef SelectionListenerList::iterator SelectionListenerIterator;
    };
}

#endif // end GCN_LISTBOX_HPP
