/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2017-2018 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * 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, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#ifndef ROW_INDICATOR__H_
#define ROW_INDICATOR__H_

#include <wx/wx.h>

/**
 * Class representing a row indicator icon for use in
 * places like the layer widget
 */
class INDICATOR_ICON: public wxPanel
{
public:

    /**
     * An id that refers to a certain icon state.
     *
     * Exactly what that state might mean in terms of icons is up
     * to the icon provider.
     */
    using ICON_ID = int;

    /**
     * A simple object that can provide fixed bitmaps for use as row
     * indicators
     */
    class ICON_PROVIDER
    {
    public:

        virtual ~ICON_PROVIDER() {};

        /**
         * Gets a reference to the row icon in the given mode
         *
         * @param aIconId the id of the icon to get (depends on the
         * provider).
         */
        virtual const wxBitmap& GetIndicatorIcon( ICON_ID aIconId ) const = 0;
    };

    /**
     * Accessor for the default icon providers, which take
     * true and false for IDs, meaining on/off.
     *
     * @param aAlternative false for blue arrow/blank, true for the
     * green diamond
     */
    static ICON_PROVIDER& GetDefaultRowIconProvider( bool aAlternative );

    /**
     * @param aParent the owning window
     * @param aIconProvider the icon provider to get icons from
     * @param aInitialIcon is the initial state of the icon (the meaning
     * depends on what is the purpose of the icon)
     * @param aID the ID to use for the widgets - events will have
     * this ID.
     */
    INDICATOR_ICON( wxWindow* aParent,
                   ICON_PROVIDER& aIconProvider,
                   ICON_ID aInitialIcon, int aID );

    /**
     * Sets the row indiciator to the given state
     *
     * @param aIconId the icon ID to pass to the provider.
     */
    void SetIndicatorState( ICON_ID aIconId );


    /**
     * @return the current state of the indicator
     */
    ICON_ID GetIndicatorState() const;

private:

    /**
     * Scale an icon to one character width.
     */
    wxBitmap ScaledIcon( wxBitmap const& aSource ) const;

    ///> An class that delivers icons for the indictor (currently just
    ///> uses a default implementation).
    ICON_PROVIDER& m_iconProvider;

    ///> Handle on the bitmap widget
    wxStaticBitmap* m_bitmap;

    ///> Is the icon currently "on"
    ICON_ID m_currentId;
};


/**
 * Icon provider for the "standard" row indicators, for example in
 * layer selection lists
 */
class ROW_ICON_PROVIDER: public INDICATOR_ICON::ICON_PROVIDER
{
public:

    ///> State constants to select the right icons
    enum STATE
    {
        OFF,    ///> Row "off" or "deselected"
        ON,     ///> Row "on" or "selected"
    };

    /**
     * @param aAlt false: normal icons (blue arrow/blank), true:
     * alternative icons (blue arrow/green diamond)
     */
    ROW_ICON_PROVIDER( bool aAlt );

    ///> @copydoc INDICATOR_ICON::ICON_PROVIDER::GetIndicatorIcon()
    const wxBitmap& GetIndicatorIcon( INDICATOR_ICON::ICON_ID aIconId ) const override;

private:
    bool m_alt;
};



#endif // ROW_INDICATOR__H_