1 files changed, 142 insertions, 0 deletions
diff --git a/Source/WebCore/platform/win/WheelEventWin.cpp b/Source/WebCore/platform/win/WheelEventWin.cpp
new file mode 100644
index 000000000..9ef248bc7
--- /dev/null
+++ b/Source/WebCore/platform/win/WheelEventWin.cpp
@@ -0,0 +1,142 @@
+/*
+ * 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 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 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 "GDIUtilities.h"
+#include "HWndDC.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);
+    IntPoint logicalPoint(point);
+    float inverseScaleFactor = 1.0f / deviceScaleFactorForWindow(hWnd);
+    logicalPoint.scale(inverseScaleFactor, inverseScaleFactor);
+    return logicalPoint;
+}
+
+static IntPoint globalPositionForEvent(HWND hWnd, LPARAM lParam)
+{
+    IntPoint logicalPoint(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
+    float inverseScaleFactor = 1.0f / deviceScaleFactorForWindow(hWnd);
+    logicalPoint.scale(inverseScaleFactor, inverseScaleFactor);
+    return logicalPoint;
+}
+
+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()};
+    float inverseScaleFactor = 1.0f / deviceScaleFactorForWindow(hWnd);
+    m_globalPosition = point;
+    m_globalPosition.scale(inverseScaleFactor, inverseScaleFactor);
+
+    // Position needs to be translated to our client
+    ScreenToClient(hWnd, &point);
+    m_position = point;
+    m_position.scale(inverseScaleFactor, inverseScaleFactor);
+}
+
+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)
+{
+    float scaleFactor = deviceScaleFactorForWindow(hWnd);
+
+    // 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 = scaleFactor * 100.0f / 3.0f;
+    float delta = GET_WHEEL_DELTA_WPARAM(wParam) / (scaleFactor * 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;
+    }
+}
+
+}