/**

 * This file is part of the DOM implementation for KDE.

 *

 * Copyright (C) 2001 Peter Kelly (pmk@post.com)

 * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)

 * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)

 * Copyright (C) 2003, 2005, 2006 Apple Computer, Inc.

 *

 * 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 "config.h"

#include "MouseRelatedEvent.h"

#include "DOMWindow.h"

#include "Document.h"

#include "Frame.h"

#include "FrameView.h"

#include "Node.h"

#include "RenderLayer.h"

#include "RenderObject.h"

namespace WebCore {

MouseRelatedEvent::MouseRelatedEvent()

    : m_screenX(0)

    , m_screenY(0)

    , m_clientX(0)

    , m_clientY(0)

    , m_pageX(0)

    , m_pageY(0)

    , m_layerX(0)

    , m_layerY(0)

    , m_offsetX(0)

    , m_offsetY(0)

    , m_isSimulated(false)

{

}

static int contentsX(AbstractView* abstractView)

{

    if (!abstractView)

        return 0;

    Frame* frame = abstractView->frame();

    if (!frame)

        return 0;

    FrameView* frameView = frame->view();

    if (!frameView)

        return 0;

    return frameView->contentsX();

}

static int contentsY(AbstractView* abstractView)

{

    if (!abstractView)

        return 0;

    Frame* frame = abstractView->frame();

    if (!frame)

        return 0;

    FrameView* frameView = frame->view();

    if (!frameView)

        return 0;

    return frameView->contentsY();

}

MouseRelatedEvent::MouseRelatedEvent(const AtomicString& eventType, bool canBubble, bool cancelable, AbstractView* view,

                                     int detail, int screenX, int screenY, int pageX, int pageY,

                                     bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, bool isSimulated)

    : UIEventWithKeyState(eventType, canBubble, cancelable, view, detail, ctrlKey, altKey, shiftKey, metaKey)

    , m_screenX(screenX)

    , m_screenY(screenY)

    , m_clientX(pageX - contentsX(view))

    , m_clientY(pageY - contentsY(view))

    , m_pageX(pageX)

    , m_pageY(pageY)

    , m_isSimulated(isSimulated)

{

    initCoordinates();

}

void MouseRelatedEvent::initCoordinates()

{

    // Set up initial values for coordinates.

    // Correct values can't be computed until we have at target, so receivedTarget

    // does the "real" computation.

    m_layerX = m_pageX;

    m_layerY = m_pageY;

    m_offsetX = m_pageX;

    m_offsetY = m_pageY;

}

void MouseRelatedEvent::initCoordinates(int clientX, int clientY)

{

    // Set up initial values for coordinates.

    // Correct values can't be computed until we have at target, so receivedTarget

    // does the "real" computation.

    m_clientX = clientX;

    m_clientY = clientY;

    m_pageX = clientX + contentsX(view());

    m_pageY = clientY + contentsY(view());

    m_layerX = m_pageX;

    m_layerY = m_pageY;

    m_offsetX = m_pageX;

    m_offsetY = m_pageY;

}

void MouseRelatedEvent::receivedTarget()

{

    ASSERT(target());

    Node* targ = target()->toNode();

    if (!targ)

        return;

    // Compute coordinates that are based on the target.

    m_layerX = m_pageX;

    m_layerY = m_pageY;

    m_offsetX = m_pageX;

    m_offsetY = m_pageY;

    // Must have an updated render tree for this math to work correctly.

    targ->document()->updateRendering();

    // Adjust offsetX/Y to be relative to the target's position.

    if (!isSimulated()) {

        if (RenderObject* r = targ->renderer()) {

            int rx, ry;

            if (r->absolutePosition(rx, ry)) {

                m_offsetX -= rx;

                m_offsetY -= ry;

            }

        }

    }

    // Adjust layerX/Y to be relative to the layer.

    // FIXME: We're pretty sure this is the wrong defintion of "layer."

    // Our RenderLayer is a more modern concept, and layerX/Y is some

    // other notion about groups of elements (left over from the Netscape 4 days?);

    // we should test and fix this.

    Node* n = targ;

    while (n && !n->renderer())

        n = n->parent();

    if (n) {

        RenderLayer* layer = n->renderer()->enclosingLayer();

        layer->updateLayerPosition();

        for (; layer; layer = layer->parent()) {

            m_layerX -= layer->xPos();

            m_layerY -= layer->yPos();

        }

    }

}

int MouseRelatedEvent::pageX() const

{

    return m_pageX;

}

int MouseRelatedEvent::pageY() const

{

    return m_pageY;

}

int MouseRelatedEvent::x() const

{

    // FIXME: This is not correct.

    // See Microsoft documentation and <http://www.quirksmode.org/dom/w3c_events.html>.

    return m_clientX;

}

int MouseRelatedEvent::y() const

{

    // FIXME: This is not correct.

    // See Microsoft documentation and <http://www.quirksmode.org/dom/w3c_events.html>.

    return m_clientY;

}

} // namespace WebCore