/*
* 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
#define SPI_GETWHEELSCROLLCHARS 0x006C
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;
}
int PlatformWheelEvent::horizontalLineMultiplier() const
{
static ULONG scrollChars;
if (!scrollChars && !SystemParametersInfo(SPI_GETWHEELSCROLLCHARS, 0, &scrollChars, 0))
scrollChars = cLineMultiplier;
return scrollChars;
}
int PlatformWheelEvent::verticalLineMultiplier() const
{
static ULONG scrollLines;
if (!scrollLines && !SystemParametersInfo(SPI_GETWHEELSCROLLLINES, 0, &scrollLines, 0))
scrollLines = cLineMultiplier;
return scrollLines;
}
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
{
static ULONG scrollLines, scrollChars;
float delta = GET_WHEEL_DELTA_WPARAM(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 * horizontalLineMultiplier();
m_deltaY = 0;
m_granularity = ScrollByLineWheelEvent;
} else {
m_deltaX = 0;
m_deltaY = delta;
int verticalMultiplier = verticalLineMultiplier();
// A multiplier of -1 is used to mean that vertical wheel scrolling should be done by page.
m_granularity = (verticalMultiplier == -1) ? ScrollByPageWheelEvent : ScrollByLineWheelEvent;
if (m_granularity == ScrollByLineWheelEvent)
m_deltaY *= verticalMultiplier;
}
}
}