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// Copyright 2008, 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:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 THE COPYRIGHT
// OWNER 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 V8_EVENTS_H__
#define V8_EVENTS_H__
#include "config.h"
#include <v8.h>
#include "Frame.h"
#include "Event.h"
#include "EventListener.h"
#include "PlatformString.h"
// #define IF_DEVEL(stmt) stmt
#define IF_DEVEL(stmt) ((void) 0)
namespace WebCore {
// There are two kinds of event listeners: HTML or non-HMTL.
// onload, onfocus, etc (attributes) are always HTML event handler type;
// Event listeners added by Window.addEventListener
// or EventTargetNode::addEventListener are non-HTML type.
//
// Why does this matter?
// WebKit does not allow duplicated HTML event handlers of the same type,
// but ALLOWs duplicated non-HTML event handlers.
class V8AbstractEventListener : public EventListener {
public:
virtual ~V8AbstractEventListener() { }
// Returns the owner frame of the listener.
Frame* frame() { return m_frame; }
// Handle event.
void handleEvent(Event*, bool isWindowEvent);
// Returns the listener object, either a function or an object.
virtual v8::Local<v8::Object> GetListenerObject() {
return v8::Local<v8::Object>::New(m_listener);
}
// Dispose listener object and clear the handle
void DisposeListenerObject();
private:
V8AbstractEventListener(Frame* frame, bool html);
// Call listener function.
virtual v8::Local<v8::Value>
CallListenerFunction(v8::Handle<v8::Value> jsevent,
Event* event, bool isWindowEvent) = 0;
// Frame to which the event listener is attached to.
// An event listener must be destroyed before its owner
// frame is deleted.
// See fast/dom/replaceChild.html
// TODO(fqian): this could hold m_frame live until
// the event listener is deleted. Fix this!
Frame* m_frame;
// Listener object, avoid using peer because it can keep this object alive.
v8::Persistent<v8::Object> m_listener;
// Flags this is a HTML type listener.
bool m_html;
// Position in the HTML source for HTML event listeners.
int m_lineNumber;
int m_columnNumber;
friend class V8EventListener;
friend class V8XHREventListener;
friend class V8LazyEventListener;
};
// V8EventListener is a wrapper of a JS object implements EventListener
// interface (has handleEvent(event) method), or a JS function
// that can handle the event.
class V8EventListener : public V8AbstractEventListener {
public:
V8EventListener(Frame* frame, v8::Local<v8::Object> listener, bool html);
virtual ~V8EventListener();
virtual bool isHTMLEventListener() const { return m_html; }
// Detach the listener from its owner frame.
void disconnectFrame() { m_frame = 0; }
private:
// Call listener function.
virtual v8::Local<v8::Value> CallListenerFunction(
v8::Handle<v8::Value> jsevent, Event* event, bool isWindowEvent);
v8::Local<v8::Object> GetThisObject(Event* event, bool isWindowEvent);
v8::Local<v8::Function> GetListenerFunction();
};
// V8XHREventListener is a special listener wrapper for XMLHttpRequest object.
// It keeps JS listener week.
class V8XHREventListener : public V8EventListener {
public:
V8XHREventListener(Frame* frame, v8::Local<v8::Object> listener, bool html);
virtual ~V8XHREventListener();
};
// V8LazyEventListener is a wrapper for a JavaScript code string that is
// compiled and evaluated when an event is fired.
// A V8LazyEventListener is always a HTML event handler.
class V8LazyEventListener : public V8AbstractEventListener {
public:
V8LazyEventListener(Frame *frame, const String& code,
const String& func_name);
virtual ~V8LazyEventListener();
virtual bool isHTMLEventListener() const { return true; }
// For lazy event listener, the listener object is the same as its listener
// function without additional scope chains.
virtual v8::Local<v8::Object> GetListenerObject() {
return GetWrappedListenerFunction();
}
private:
String m_code;
String m_func_name; // function name
bool m_compiled;
// If the event listener is on a non-document dom node,
// we compile the function with some implicit scope chains before it.
bool m_wrapped_function_compiled;
v8::Persistent<v8::Function> m_wrapped_function;
v8::Local<v8::Function> GetWrappedListenerFunction();
virtual v8::Local<v8::Value> CallListenerFunction(
v8::Handle<v8::Value> jsevent, Event* event, bool isWindowEvent);
v8::Local<v8::Object> GetThisObject(Event* event, bool isWindowEvent);
v8::Local<v8::Function> GetListenerFunction();
};
} // namespace WebCore
#endif // V8_EVENTS_H__
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