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/*
* Copyright (C) 2010 Google 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.
*
*/
#ifndef EventContext_h
#define EventContext_h
#include "EventTarget.h"
#include "Node.h"
#include "TreeScope.h"
#include <wtf/RefPtr.h>
namespace WebCore {
class Event;
#if ENABLE(TOUCH_EVENTS)
class TouchList;
#endif
class EventContext {
public:
// FIXME: Use ContainerNode instead of Node.
EventContext(PassRefPtr<Node>, PassRefPtr<EventTarget> currentTarget, PassRefPtr<EventTarget> target);
virtual ~EventContext();
Node* node() const { return m_node.get(); }
EventTarget* target() const { return m_target.get(); }
bool currentTargetSameAsTarget() const { return m_currentTarget.get() == m_target.get(); }
virtual void handleLocalEvents(Event*) const;
virtual bool isMouseOrFocusEventContext() const;
virtual bool isTouchEventContext() const;
protected:
#ifndef NDEBUG
bool isUnreachableNode(EventTarget*);
bool isReachable(Node*) const;
#endif
RefPtr<Node> m_node;
RefPtr<EventTarget> m_currentTarget;
RefPtr<EventTarget> m_target;
};
typedef Vector<OwnPtr<EventContext>, 32> EventPath;
class MouseOrFocusEventContext : public EventContext {
public:
MouseOrFocusEventContext(PassRefPtr<Node>, PassRefPtr<EventTarget> currentTarget, PassRefPtr<EventTarget> target);
virtual ~MouseOrFocusEventContext();
EventTarget* relatedTarget() const { return m_relatedTarget.get(); }
void setRelatedTarget(PassRefPtr<EventTarget>);
virtual void handleLocalEvents(Event*) const OVERRIDE;
virtual bool isMouseOrFocusEventContext() const OVERRIDE;
private:
RefPtr<EventTarget> m_relatedTarget;
};
#if ENABLE(TOUCH_EVENTS)
class TouchEventContext : public EventContext {
public:
TouchEventContext(PassRefPtr<Node>, PassRefPtr<EventTarget> currentTarget, PassRefPtr<EventTarget> target);
virtual ~TouchEventContext();
virtual void handleLocalEvents(Event*) const OVERRIDE;
virtual bool isTouchEventContext() const OVERRIDE;
TouchList* touches() { return m_touches.get(); }
TouchList* targetTouches() { return m_targetTouches.get(); }
TouchList* changedTouches() { return m_changedTouches.get(); }
private:
RefPtr<TouchList> m_touches;
RefPtr<TouchList> m_targetTouches;
RefPtr<TouchList> m_changedTouches;
#ifndef NDEBUG
void checkReachability(TouchList*) const;
#endif
};
inline TouchEventContext* toTouchEventContext(EventContext* eventContext)
{
ASSERT_WITH_SECURITY_IMPLICATION(!eventContext || eventContext->isTouchEventContext());
return static_cast<TouchEventContext*>(eventContext);
}
#endif // ENABLE(TOUCH_EVENTS)
#ifndef NDEBUG
inline bool EventContext::isUnreachableNode(EventTarget* target)
{
// FIXME: Checks also for SVG elements.
return target && target->toNode() && !target->toNode()->isSVGElement() && !isReachable(target->toNode());
}
inline bool EventContext::isReachable(Node* target) const
{
ASSERT(target);
TreeScope* targetScope = target->treeScope();
for (TreeScope* scope = m_node->treeScope(); scope; scope = scope->parentTreeScope()) {
if (scope == targetScope)
return true;
}
return false;
}
#endif
inline void MouseOrFocusEventContext::setRelatedTarget(PassRefPtr<EventTarget> relatedTarget)
{
ASSERT(!isUnreachableNode(relatedTarget.get()));
m_relatedTarget = relatedTarget;
}
}
#endif // EventContext_h
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