/*

 * 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, 2008 Apple Inc. All rights reserved.

 *

 * 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 "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->scrollX() / frameView->pageZoomFactor();

}

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->scrollY() / frameView->pageZoomFactor();

}

MouseRelatedEvent::MouseRelatedEvent(const AtomicString& eventType, bool canBubble, bool cancelable, PassRefPtr<AbstractView> viewArg,

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

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

    : UIEventWithKeyState(eventType, canBubble, cancelable, viewArg, 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;

    computePageLocation();

}

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;

    computePageLocation();

}

static float pageZoomFactor(UIEvent* event)

{

    DOMWindow* window = event->view();

    if (!window)

        return 1;

    Frame* frame = window->frame();

    if (!frame)

        return 1;

    FrameView* view = frame->view();

    if (!view)

        return 1;

    return view->pageZoomFactor();

}

void MouseRelatedEvent::computePageLocation()

{

    float zoomFactor = pageZoomFactor(this);

    setAbsoluteLocation(roundedIntPoint(FloatPoint(pageX() * zoomFactor, pageY() * zoomFactor)));

}

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()->updateStyleIfNeeded();

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

    if (!isSimulated()) {

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

            FloatPoint localPos = r->absoluteToLocal(absoluteLocation(), false, true);

            float zoomFactor = pageZoomFactor(this);

            m_offsetX = lroundf(localPos.x() / zoomFactor);

            m_offsetY = lroundf(localPos.y() / zoomFactor);

        }

    }

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

    // FIXME: We're pretty sure this is the wrong definition 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->x();

            m_layerY -= layer->y();

        }

    }

}

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