/*

 * Copyright (C) 2006, 2007 Apple Inc.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

 */

#include "PlatformWheelEvent.h"

#include <windows.h>

#include <windowsx.h>

namespace WebCore {

#define HIGH_BIT_MASK_SHORT 0x8000

static IntPoint positionForEvent(HWND hWnd, LPARAM lParam)

{

    POINT point = {GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};

    ScreenToClient(hWnd, &point);

    return point;

}

static IntPoint globalPositionForEvent(HWND hWnd, LPARAM lParam)

{

    POINT point = {GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};

    return point;

}

PlatformWheelEvent::PlatformWheelEvent(HWND hWnd, WPARAM wParam, LPARAM lParam, bool isHorizontal)

    : m_position(positionForEvent(hWnd, lParam))

    , m_globalPosition(globalPositionForEvent(hWnd, lParam))

    , m_isAccepted(false)

    , m_shiftKey(wParam & MK_SHIFT)

    , m_ctrlKey(wParam & MK_CONTROL)

    , m_altKey(GetKeyState(VK_MENU) & HIGH_BIT_MASK_SHORT)

    , m_metaKey(m_altKey) // FIXME: We'll have to test other browsers

    , m_isContinuous(false)

{

    float delta = short(HIWORD(wParam)) / (float)WHEEL_DELTA;

    if (isHorizontal) {

        // Windows sends a positive delta for scrolling right, while AppKit

        // sends a negative delta. EventHandler expects the AppKit values,

        // so we have to negate our horizontal delta to match.

        m_deltaX = -delta;

        m_deltaY = 0;

    } else {

        m_deltaX = 0;

        m_deltaY = delta;

    }

}

}