/* This file is part of the KDE project

   Copyright (C) 2006 Thorsten Zachmann <zachmann@kde.org>
   Copyright (C) 2006 Thomas Zander <zander@kde.org>

   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.
*/

#include "KoShapeMoveStrategy.h"

#include <QPainter>
#include <QDebug>
#include <QMouseEvent>

#include "KoCanvasBase.h"
#include "KoShapeManager.h"
#include "KoSelection.h"
#include "KoGfxEvent.h"
#include "KoCommand.h"
#include "kcommand.h"

KoShapeMoveStrategy::KoShapeMoveStrategy( KoTool *tool, KoCanvasBase *canvas, const QPointF &clicked)
: KoInteractionStrategy(tool, canvas)
, m_initialTopLeft(99999, 99999)
, m_start(clicked)
{
    KoSelectionSet selectedObjects = canvas->shapeManager()->selection()->selectedObjects(KoFlake::StrippedSelection);
    QRectF boundingRect;
    foreach(KoShape *shape, selectedObjects) {
        if(shape->isLocked())
            continue;
        m_selectedObjects << shape;
        m_previousPositions << shape->position();
        m_newPositions << shape->position();
        boundingRect = boundingRect.unite( shape->boundingRect() );
    }
    m_initialTopLeft = boundingRect.topLeft();
}

void KoShapeMoveStrategy::handleMouseMove(const QPointF &point, Qt::KeyboardModifiers modifiers) {
    m_diff = point - m_start;
    if(m_canvas->snapToGrid() && (modifiers & Qt::ShiftModifier) == 0) {
        QPointF newPos = m_initialTopLeft + m_diff;
        applyGrid(newPos);
        m_diff = newPos - m_initialTopLeft;
    }
    if(modifiers & (Qt::AltModifier | Qt::ControlModifier)) {
        // keep x or y position unchanged
        if(qAbs(m_diff.x()) < qAbs(m_diff.y()))
            m_diff.setX(0);
        else
            m_diff.setY(0);
    }

    int i=0;
    foreach(KoShape *shape, m_selectedObjects) {
        QPointF newPos (m_previousPositions.at(i) + m_diff);
        m_newPositions[i] = newPos;
        shape->repaint();
        shape->setPosition(newPos);
        shape->repaint();
        i++;
    }
}

KCommand* KoShapeMoveStrategy::createCommand() {
    if(m_diff.x() == 0 && m_diff.y() == 0)
        return 0;
    return new KoShapeMoveCommand(m_selectedObjects, m_previousPositions, m_newPositions);
}