Selectively disable rubber banding on mac.

Source/core/page/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * 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 "core/page/EventHandler.h"
 
 #include "HTMLNames.h"
 #include "RuntimeEnabledFeatures.h"
 #include "SVGNames.h"
 #include "bindings/v8/ExceptionStatePlaceholder.h"
 #include "core/clipboard/Clipboard.h"
 #include "core/clipboard/DataObject.h"
 #include "core/dom/Document.h"
@@ skipping 2069 matching lines @@
 #if OS(ANDROID) || OS(MACOSX) || OS(WIN)
     return false;
 #else
     // GTK+ must scroll horizontally if the mouse pointer is on top of the
     // horizontal scrollbar while scrolling with the wheel.
     // This code comes from gtk/EventHandlerGtk.cpp.
     return !event.hasPreciseScrollingDeltas() && result.scrollbar() && result.scrollbar()->orientation() == HorizontalScrollbar;
 #endif
 }
 
-bool EventHandler::handleWheelEvent(const PlatformWheelEvent& e)
+bool EventHandler::handleWheelEvent(const PlatformWheelEvent& e, bool canRubberbandLeft, bool canRubberbandRight)
 {
 #define RETURN_WHEEL_EVENT_HANDLED() \
     { \
         setFrameWasScrolledByUser(); \
         return true; \
     }
 
     Document* doc = m_frame->document();
 
     if (!doc->renderer())
@@ skipping 43 matching lines @@
     PlatformWheelEvent event = e;
     if (m_baseEventType == PlatformEvent::NoType && shouldTurnVerticalTicksIntoHorizontal(result, e))
         event = event.copyTurningVerticalTicksIntoHorizontalTicks();
 
     if (node) {
         // Figure out which view to send the event to.
         RenderObject* target = node->renderer();
 
         if (isOverWidget && target && target->isWidget()) {
             Widget* widget = toRenderWidget(target)->widget();
-            if (widget && passWheelEventToWidget(e, widget))
+            if (widget && passWheelEventToWidget(e, widget, canRubberbandLeft, canRubberbandRight)) {
                 RETURN_WHEEL_EVENT_HANDLED();
+            }
         }
 
         if (node && !node->dispatchWheelEvent(event))
             RETURN_WHEEL_EVENT_HANDLED();
     }
 
     // Ctrl + scrollwheel is reserved for triggering zoom in/out actions in Chromium.
     // When Ctrl is pressed and the event was not canceled by JavaScript code,
     // return false to notify the caller that the scrollwheel event was not canceled.
     if (e.ctrlKey())
         return false;
 
 
     // We do another check on the frame view because the event handler can run JS which results in the frame getting destroyed.
     view = m_frame->view();
-    if (!view || !view->wheelEvent(event))
+    if (!view || !view->wheelEvent(event, canRubberbandLeft, canRubberbandRight))
         return false;
 
     RETURN_WHEEL_EVENT_HANDLED();
 
 #undef RETURN_WHEEL_EVENT_HANDLED
 }
 
 void EventHandler::defaultWheelEventHandler(Node* startNode, WheelEvent* wheelEvent)
 {
     if (!startNode || !wheelEvent)
@@ skipping 434 matching lines @@
     const float tickDivisor = static_cast<float>(WheelEvent::TickMultiplier);
     IntPoint point(gestureEvent.position().x(), gestureEvent.position().y());
     IntPoint globalPoint(gestureEvent.globalPosition().x(), gestureEvent.globalPosition().y());
     PlatformWheelEvent syntheticWheelEvent(point, globalPoint,
         scaledDelta.width(), scaledDelta.height(),
         scaledDelta.width() / tickDivisor, scaledDelta.height() / tickDivisor,
         ScrollByPixelWheelEvent,
         gestureEvent.shiftKey(), gestureEvent.ctrlKey(), gestureEvent.altKey(), gestureEvent.metaKey());
     syntheticWheelEvent.setHasPreciseScrollingDeltas(true);
 
-    bool scrolledFrame = view->wheelEvent(syntheticWheelEvent);
+    bool scrolledFrame = view->wheelEvent(syntheticWheelEvent, true, true);
     if (scrolledFrame)
         setFrameWasScrolledByUser();
 
     return scrolledFrame;
 }
 
 LocalFrame* EventHandler::getSubFrameForGestureEvent(const IntPoint& touchAdjustedPoint, const PlatformGestureEvent& gestureEvent)
 {
     PlatformMouseEvent mouseDown(touchAdjustedPoint, gestureEvent.globalPosition(), LeftButton, PlatformEvent::MousePressed, 1,
         gestureEvent.shiftKey(), gestureEvent.ctrlKey(), gestureEvent.altKey(), gestureEvent.metaKey(), gestureEvent.timestamp());
@@ skipping 1316 matching lines @@
     subframe->eventHandler().handleMouseMoveOrLeaveEvent(mev.event(), hoveredNode);
     return true;
 }
 
 bool EventHandler::passMouseReleaseEventToSubframe(MouseEventWithHitTestResults& mev, LocalFrame* subframe)
 {
     subframe->eventHandler().handleMouseReleaseEvent(mev.event());
     return true;
 }
 
-bool EventHandler::passWheelEventToWidget(const PlatformWheelEvent& wheelEvent, Widget* widget)
+bool EventHandler::passWheelEventToWidget(const PlatformWheelEvent& wheelEvent, Widget* widget, bool canRubberbandLeft, bool canRubberbandRight)
 {
     // We can sometimes get a null widget!  EventHandlerMac handles a null
     // widget by returning false, so we do the same.
     if (!widget)
         return false;
 
     // If not a FrameView, then probably a plugin widget.  Those will receive
     // the event via an EventTargetNode dispatch when this returns false.
     if (!widget->isFrameView())
         return false;
 
-    return toFrameView(widget)->frame().eventHandler().handleWheelEvent(wheelEvent);
+    return toFrameView(widget)->frame().eventHandler().handleWheelEvent(wheelEvent, canRubberbandLeft, canRubberbandRight);
 }
 
 bool EventHandler::passWidgetMouseDownEventToWidget(const MouseEventWithHitTestResults& event)
 {
     // Figure out which view to send the event to.
     if (!event.targetNode() || !event.targetNode()->renderer() || !event.targetNode()->renderer()->isWidget())
         return false;
     return false;
 }
 
@@ skipping 13 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace WebCore