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diff --git a/WebCore/platform/mac/PlatformMouseEventMac.mm b/WebCore/platform/mac/PlatformMouseEventMac.mm
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+++ b/WebCore/platform/mac/PlatformMouseEventMac.mm
@@ -0,0 +1,177 @@
+/*
+ * Copyright (C) 2004, 2006 Apple Computer, 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. 
+ */
+
+#import "config.h"
+#import "PlatformMouseEvent.h"
+
+#import "PlatformScreen.h"
+
+namespace WebCore {
+
+static MouseButton mouseButtonForEvent(NSEvent *event)
+{
+    switch ([event type]) {
+        case NSLeftMouseDown:
+        case NSLeftMouseUp:
+        case NSLeftMouseDragged:
+            return LeftButton;
+        case NSRightMouseDown:
+        case NSRightMouseUp:
+        case NSRightMouseDragged:
+            return RightButton;
+        case NSOtherMouseDown:
+        case NSOtherMouseUp:
+        case NSOtherMouseDragged:
+            return MiddleButton;
+        default:
+            return NoButton;
+    }
+}
+
+static int clickCountForEvent(NSEvent *event)
+{
+    switch ([event type]) {
+        case NSLeftMouseDown:
+        case NSLeftMouseUp:
+        case NSLeftMouseDragged:
+        case NSRightMouseDown:
+        case NSRightMouseUp:
+        case NSRightMouseDragged:
+        case NSOtherMouseDown:
+        case NSOtherMouseUp:
+        case NSOtherMouseDragged:
+            return [event clickCount];
+        default:
+            return 0;
+    }
+}
+
+IntPoint globalPoint(const NSPoint& windowPoint, NSWindow* window)
+{
+    return IntPoint(flipScreenPoint([window convertBaseToScreen:windowPoint], screenForWindow(window)));
+}
+
+IntPoint pointForEvent(NSEvent *event)
+{
+    switch ([event type]) {
+        case NSLeftMouseDown:
+        case NSLeftMouseUp:
+        case NSLeftMouseDragged:
+        case NSRightMouseDown:
+        case NSRightMouseUp:
+        case NSRightMouseDragged:
+        case NSOtherMouseDown:
+        case NSOtherMouseUp:
+        case NSOtherMouseDragged:
+        case NSMouseMoved:
+        case NSScrollWheel:
+            // Note: This has its origin at the bottom left of the window.
+            // The Y coordinate gets flipped by ScrollView::viewportToContents.
+            // We should probably change both this and that to not use "bottom left origin" coordinates at all.
+            return IntPoint([event locationInWindow]);
+        default:
+            return IntPoint();
+    }
+}
+
+IntPoint globalPointForEvent(NSEvent *event)
+{
+    switch ([event type]) {
+        case NSLeftMouseDown:
+        case NSLeftMouseUp:
+        case NSLeftMouseDragged:
+        case NSRightMouseDown:
+        case NSRightMouseUp:
+        case NSRightMouseDragged:
+        case NSOtherMouseDown:
+        case NSOtherMouseUp:
+        case NSOtherMouseDragged:
+        case NSMouseMoved:
+        case NSScrollWheel:
+            return globalPoint([event locationInWindow], [event window]);
+        default:
+            return IntPoint();
+    }
+}
+
+int eventNumberForEvent(NSEvent *event)
+{
+    switch ([event type]) {
+        case NSLeftMouseDown:
+        case NSLeftMouseUp:
+        case NSLeftMouseDragged:
+        case NSRightMouseDown:
+        case NSRightMouseUp:
+        case NSRightMouseDragged:
+        case NSOtherMouseDown:
+        case NSOtherMouseUp:
+        case NSOtherMouseDragged:
+        case NSMouseMoved:
+            return [event eventNumber];
+        default:
+            return 0;
+    }
+}
+    
+static MouseEventType mouseEventForNSEvent(NSEvent* event) 
+{
+    switch ([event type]) {
+    case NSScrollWheel:
+        return MouseEventScroll;
+    case NSLeftMouseDragged:
+    case NSRightMouseDragged:
+    case NSOtherMouseDragged:
+    case NSMouseMoved:
+        return MouseEventMoved;
+    case NSLeftMouseDown:
+    case NSRightMouseDown:
+    case NSOtherMouseDown:
+        return MouseEventPressed;
+    case NSLeftMouseUp:
+    case NSRightMouseUp:
+    case NSOtherMouseUp:
+        return MouseEventReleased;
+    default:
+        return MouseEventMoved;
+    }
+}
+
+PlatformMouseEvent::PlatformMouseEvent(NSEvent* event)
+    : m_position(pointForEvent(event))
+    , m_globalPosition(globalPointForEvent(event))
+    , m_button(mouseButtonForEvent(event))
+    , m_eventType(mouseEventForNSEvent(event))
+    , m_clickCount(clickCountForEvent(event))
+    , m_shiftKey([event modifierFlags] & NSShiftKeyMask)
+    , m_ctrlKey([event modifierFlags] & NSControlKeyMask)
+    , m_altKey([event modifierFlags] & NSAlternateKeyMask)
+    , m_metaKey([event modifierFlags] & NSCommandKeyMask)
+    , m_timestamp([event timestamp])
+    , m_modifierFlags([event modifierFlags])
+    , m_eventNumber([event eventNumber])
+{
+}
+
+}