1 files changed, 94 insertions, 0 deletions
diff --git a/WebCore/platform/win/WheelEventWin.cpp b/WebCore/platform/win/WheelEventWin.cpp
new file mode 100644
index 0000000..d272ba7
--- /dev/null
+++ b/WebCore/platform/win/WheelEventWin.cpp
@@ -0,0 +1,94 @@
+/*
+ * 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;
+    }
+}
+
+}