1/* 2 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "config.h" 27#include "PlatformWheelEvent.h" 28 29#include "FloatPoint.h" 30#include "FloatSize.h" 31#include <windows.h> 32#include <windowsx.h> 33 34namespace WebCore { 35 36#define HIGH_BIT_MASK_SHORT 0x8000 37#define SPI_GETWHEELSCROLLCHARS 0x006C 38 39static IntPoint positionForEvent(HWND hWnd, LPARAM lParam) 40{ 41 POINT point = {GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)}; 42 ScreenToClient(hWnd, &point); 43 return point; 44} 45 46static IntPoint globalPositionForEvent(HWND hWnd, LPARAM lParam) 47{ 48 POINT point = {GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)}; 49 return point; 50} 51 52static int horizontalScrollChars() 53{ 54 static ULONG scrollChars; 55 if (!scrollChars && !SystemParametersInfo(SPI_GETWHEELSCROLLCHARS, 0, &scrollChars, 0)) 56 scrollChars = 1; 57 return scrollChars; 58} 59 60static int verticalScrollLines() 61{ 62 static ULONG scrollLines; 63 if (!scrollLines && !SystemParametersInfo(SPI_GETWHEELSCROLLLINES, 0, &scrollLines, 0)) 64 scrollLines = 3; 65 return scrollLines; 66} 67 68PlatformWheelEvent::PlatformWheelEvent(HWND hWnd, const FloatSize& delta, const FloatPoint& location) 69 : PlatformEvent(PlatformEvent::Wheel, false, false, false, false, ::GetTickCount() * 0.001) 70 , m_directionInvertedFromDevice(false) 71{ 72 m_deltaX = delta.width(); 73 m_deltaY = delta.height(); 74 75 m_wheelTicksX = m_deltaX; 76 m_wheelTicksY = m_deltaY; 77 78 // Global Position is just x, y location of event 79 POINT point = {location.x(), location.y()}; 80 m_globalPosition = point; 81 82 // Position needs to be translated to our client 83 ScreenToClient(hWnd, &point); 84 m_position = point; 85} 86 87PlatformWheelEvent::PlatformWheelEvent(HWND hWnd, WPARAM wParam, LPARAM lParam, bool isMouseHWheel) 88 : 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) 89 , m_position(positionForEvent(hWnd, lParam)) 90 , m_globalPosition(globalPositionForEvent(hWnd, lParam)) 91 , m_directionInvertedFromDevice(false) 92{ 93 // How many pixels should we scroll per line? Gecko uses the height of the 94 // current line, which means scroll distance changes as you go through the 95 // page or go to different pages. IE 7 is ~50 px/line, although the value 96 // seems to vary slightly by page and zoom level. Since IE 7 has a 97 // smoothing algorithm on scrolling, it can get away with slightly larger 98 // scroll values without feeling jerky. Here we use 100 px per three lines 99 // (the default scroll amount on Windows is three lines per wheel tick). 100 static const float cScrollbarPixelsPerLine = 100.0f / 3.0f; 101 float delta = GET_WHEEL_DELTA_WPARAM(wParam) / static_cast<float>(WHEEL_DELTA); 102 if (isMouseHWheel) { 103 // Windows is <-- -/+ -->, WebKit wants <-- +/- -->, so we negate 104 // |delta| after saving the original value on the wheel tick member. 105 m_wheelTicksX = delta; 106 m_wheelTicksY = 0; 107 delta = -delta; 108 } else { 109 // Even though we use shift + vertical wheel to scroll horizontally in 110 // WebKit, we still note it as a vertical scroll on the wheel tick 111 // member, so that the DOM event we later construct will match the real 112 // hardware event better. 113 m_wheelTicksX = 0; 114 m_wheelTicksY = delta; 115 } 116 if (isMouseHWheel || shiftKey()) { 117 m_deltaX = delta * static_cast<float>(horizontalScrollChars()) * cScrollbarPixelsPerLine; 118 m_deltaY = 0; 119 m_granularity = ScrollByPixelWheelEvent; 120 } else { 121 m_deltaX = 0; 122 m_deltaY = delta; 123 int verticalMultiplier = verticalScrollLines(); 124 m_granularity = (verticalMultiplier == WHEEL_PAGESCROLL) ? ScrollByPageWheelEvent : ScrollByPixelWheelEvent; 125 if (m_granularity == ScrollByPixelWheelEvent) 126 m_deltaY *= static_cast<float>(verticalMultiplier) * cScrollbarPixelsPerLine; 127 } 128} 129 130} 131