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/*
* 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 "config.h"
#include "PlatformWheelEvent.h"
#include "FloatPoint.h"
#include "FloatSize.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;
}
static int horizontalScrollChars()
{
static ULONG scrollChars;
if (!scrollChars && !SystemParametersInfo(SPI_GETWHEELSCROLLCHARS, 0, &scrollChars, 0))
scrollChars = 1;
return scrollChars;
}
static int verticalScrollLines()
{
static ULONG scrollLines;
if (!scrollLines && !SystemParametersInfo(SPI_GETWHEELSCROLLLINES, 0, &scrollLines, 0))
scrollLines = 3;
return scrollLines;
}
PlatformWheelEvent::PlatformWheelEvent(HWND hWnd, const FloatSize& delta, const FloatPoint& location)
: PlatformEvent(PlatformEvent::Wheel, false, false, false, false, ::GetTickCount() * 0.001)
, m_directionInvertedFromDevice(false)
{
m_deltaX = delta.width();
m_deltaY = delta.height();
m_wheelTicksX = m_deltaX;
m_wheelTicksY = m_deltaY;
// Global Position is just x, y location of event
POINT point = {location.x(), location.y()};
m_globalPosition = point;
// Position needs to be translated to our client
ScreenToClient(hWnd, &point);
m_position = point;
}
PlatformWheelEvent::PlatformWheelEvent(HWND hWnd, WPARAM wParam, LPARAM lParam, bool isMouseHWheel)
: PlatformEvent(PlatformEvent::Wheel, wParam & MK_SHIFT, wParam & MK_CONTROL, GetKeyState(VK_MENU) & HIGH_BIT_MASK_SHORT, GetKeyState(VK_MENU) & HIGH_BIT_MASK_SHORT, ::GetTickCount() * 0.001)
, m_position(positionForEvent(hWnd, lParam))
, m_globalPosition(globalPositionForEvent(hWnd, lParam))
, m_directionInvertedFromDevice(false)
{
// How many pixels should we scroll per line? Gecko uses the height of the
// current line, which means scroll distance changes as you go through the
// page or go to different pages. IE 7 is ~50 px/line, although the value
// seems to vary slightly by page and zoom level. Since IE 7 has a
// smoothing algorithm on scrolling, it can get away with slightly larger
// scroll values without feeling jerky. Here we use 100 px per three lines
// (the default scroll amount on Windows is three lines per wheel tick).
static const float cScrollbarPixelsPerLine = 100.0f / 3.0f;
float delta = GET_WHEEL_DELTA_WPARAM(wParam) / static_cast<float>(WHEEL_DELTA);
if (isMouseHWheel) {
// Windows is <-- -/+ -->, WebKit wants <-- +/- -->, so we negate
// |delta| after saving the original value on the wheel tick member.
m_wheelTicksX = delta;
m_wheelTicksY = 0;
delta = -delta;
} else {
// Even though we use shift + vertical wheel to scroll horizontally in
// WebKit, we still note it as a vertical scroll on the wheel tick
// member, so that the DOM event we later construct will match the real
// hardware event better.
m_wheelTicksX = 0;
m_wheelTicksY = delta;
}
if (isMouseHWheel || shiftKey()) {
m_deltaX = delta * static_cast<float>(horizontalScrollChars()) * cScrollbarPixelsPerLine;
m_deltaY = 0;
m_granularity = ScrollByPixelWheelEvent;
} else {
m_deltaX = 0;
m_deltaY = delta;
int verticalMultiplier = verticalScrollLines();
m_granularity = (verticalMultiplier == WHEEL_PAGESCROLL) ? ScrollByPageWheelEvent : ScrollByPixelWheelEvent;
if (m_granularity == ScrollByPixelWheelEvent)
m_deltaY *= static_cast<float>(verticalMultiplier) * cScrollbarPixelsPerLine;
}
}
}
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