/* Copyright (C) 2003-2010 Jesper K. Pedersen <blackie@kde.org>

   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; see the file COPYING.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/
#include "MouseTrackingInteraction.h"

#include "ThumbnailModel.h"
#include "ThumbnailWidget.h"
#include "VideoThumbnailCycler.h"

#include <DB/FileName.h>

#include <QMouseEvent>

ThumbnailView::MouseTrackingInteraction::MouseTrackingInteraction(ThumbnailFactory *factory)
    : ThumbnailComponent(factory)
    , m_cursorWasAtStackIcon(false)
{
}

bool ThumbnailView::MouseTrackingInteraction::mouseMoveEvent(QMouseEvent *event)
{
    updateStackingIndication(event);
    handleCursorOverNewIcon();

    if ((event->modifiers() & Qt::ControlModifier) != 0 && widget()->isItemUnderCursorSelected())
        VideoThumbnailCycler::instance()->stopCycle();
    else
        VideoThumbnailCycler::instance()->setActive(widget()->mediaIdUnderCursor());
    return false;
}

void ThumbnailView::MouseTrackingInteraction::updateStackingIndication(QMouseEvent *event)
{
    bool interestingArea = widget()->isMouseOverStackIndicator(event->pos());
    if (interestingArea && !m_cursorWasAtStackIcon) {
        widget()->setCursor(Qt::PointingHandCursor);
        m_cursorWasAtStackIcon = true;
    } else if (!interestingArea && m_cursorWasAtStackIcon) {
        widget()->unsetCursor();
        m_cursorWasAtStackIcon = false;
    }
}

void ThumbnailView::MouseTrackingInteraction::handleCursorOverNewIcon()
{
    static DB::FileName lastFileNameUnderCursor;
    const DB::FileName fileName = widget()->mediaIdUnderCursor();

    if (fileName != lastFileNameUnderCursor) {
        if (!fileName.isNull() && !lastFileNameUnderCursor.isNull()) {
            emit fileIdUnderCursorChanged(fileName);
            model()->updateCell(lastFileNameUnderCursor);
            model()->updateCell(fileName);
        }
        lastFileNameUnderCursor = fileName;
    }
}
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