/* This file is part of the KDE libraries
    Copyright (C) 2006,2007 Andreas Hartmetz (ahartmetz@gmail.com)

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#ifndef KGESTURE_H
#define KGESTURE_H

#include <kritawidgetutils_export.h>

#include <QString>
#include <QHash>
#include <QPolygon>

/*
 kinds of gestures:
 -shapes like triangle, right angle, line
 -"rocker" (i.e. two mouse button) gestures
 */

class KShapeGesturePrivate;
//TODO: implement operator== for special situations like in KKeyChooser.
class KRITAWIDGETUTILS_EXPORT KShapeGesture
{
public:
    /**
     * Create a new invalid shape gesture.
     */
    KShapeGesture();

    /**
     * Creates a new gesture consisting of given shape.
     * If the gesture belongs to a KAction, and the user draws approximately the same shape
     * on the screen while holding down the right mouse button, the action will trigger.
     * @p shape must be a "reasonable" polygon. It must contain at least two points
     * and it should contain at most 50 for performance reasons. No two consecutive points
     * are allowed to be at the same position.
     * @param shape shape to draw to trigger this gesture
     */
    KShapeGesture(const QPolygon &shape);

    /**
     * Creates a new gesture from a string description.
     * @param description create gesture according to this
     */
    KShapeGesture(const QString &description);

    /**
     * Copies the given gesture.
     * @param other gesture to copy
     */
    KShapeGesture(const KShapeGesture &other);

    /**
     * Destructor.
     */
    ~KShapeGesture();

    /**
     * Set the shape to draw to trigger this gesture.
     */
    void setShape(const QPolygon &shape);

    /**
     * set a user-visible name for this gesture's shape, like "triangle" or "line".
     */
    void setShapeName(const QString &friendlyName);

    /**
     * Return the user-visible name for this gesture's shape, like "triangle" or "line".
     */
    QString shapeName() const;

    /**
     * Return true if this gesture is valid.
     *
     */
    bool isValid() const;

    /**
     * Return a string representation of this gesture.
     * Return empty string if invalid.
     * This function is mainly for use with config files.
     *
     * @see shapeName()
     */
    QString toString() const;

    /**
     * Return an idealized SVG image of this gesture.
     * Return an empty image if invalid.
     * @param attributes SVG attributes to apply to the SVG "path" element that
     * makes up the drawing of the gesture. By default, only a 'fill="none"'
     * attribute will be set.
     */
    QByteArray toSvg(const QString &attributes = QString()) const;

    /**
     * Return a difference measurement betwenn this gesture and the @p other
     * gesture. Abort comparison if difference is larger than @p abortThreshold
     * and return a very large difference in that case.
     * Usual return values range from x to y //TODO: fill in x and y
     */
    float distance(const KShapeGesture &other, float abortThreshold) const;

    /**
     * Set this gesture to the other gesture.
     */
    KShapeGesture &operator=(const KShapeGesture &other);

    /**
     * Return whether this gesture is equal to the other gesture.
     */
    bool operator==(const KShapeGesture &other) const;

    /**
     * Return the opposite of operator==()
     */
    bool operator!=(const KShapeGesture &other) const;

    /**
     * Return an opaque value for use in hash tables
     */
    uint hashable() const;

private:
    KShapeGesturePrivate *const d;
};

inline uint qHash(const KShapeGesture &key)
{
    return qHash(key.hashable());
}

class KRockerGesturePrivate;

class KRITAWIDGETUTILS_EXPORT KRockerGesture
{
public:
    /**
     * Create a new invalid rocker gesture.
     */
    KRockerGesture();

    /**
     * Creates a new gesture consisting of given buttons.
     * @param hold create gesture according to this hold
     * @param thenPush create gesture according to this push
     */
    KRockerGesture(enum Qt::MouseButton hold, enum Qt::MouseButton thenPush);

    /**
     * Creates a new gesture from a string description.
     * @param description create gesture according to this
     */
    KRockerGesture(const QString &description);

    /**
     * Copies the given gesture.
     * @param other gesture to copy
     */
    KRockerGesture(const KRockerGesture &other);

    /**
     * Destructor.
     */
    ~KRockerGesture();

    /**
     * set button combination to trigger
     */
    void setButtons(Qt::MouseButton hold, Qt::MouseButton thenPush);

    /**
     * Write the button combination to hold and thenPush
     */
    void getButtons(Qt::MouseButton *hold, Qt::MouseButton *thenPush) const;

    /**
     * Return a user-friendly name of the button combination.
     */
    QString rockerName() const;

    /**
     * Return a user-friendly name for the mouse button button
     */
    static QString mouseButtonName(Qt::MouseButton button);

    /**
     * Return true if this gesture is valid.
     */
    bool isValid() const;

    /**
     * Return a string representation of this gesture.
     * Return an empty string if invalid.
     * This function is mainly for use with config files.
     *
     * @see rockerName()
     */
    QString toString() const;

    /**
     * Set this gesture to the other gesture.
     */
    KRockerGesture &operator=(const KRockerGesture &other);

    /**
     * Return whether this gesture is equal to the other gesture.
     */
    bool operator==(const KRockerGesture &other) const;

    /**
     * Return the opposite of operator==()
     */
    bool operator!=(const KRockerGesture &other) const;

    /**
     * Return an opaque value for use in hash tables
     */
    uint hashable() const;

private:
    KRockerGesturePrivate *const d;
};

inline uint qHash(const KRockerGesture &key)
{
    return qHash(key.hashable());
}

//KGESTURE_H
#endif
