kjs_events.cpp

konqueror3 embedded版本, KDE环境下的当家浏览器的嵌入式版本源码包.

// -*- c-basic-offset: 2 -*-
/*
 *  This file is part of the KDE libraries
 *  Copyright (C) 2001 Peter Kelly ([e-mail])
 *  Copyright (C) 2003 Apple Computer, Inc.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "kjs_window.h"
#include "kjs_events.h"
#include "kjs_events.lut.h"
#include "kjs_views.h"
#include "kjs_proxy.h"
#include "xml/dom_nodeimpl.h"
#include "xml/dom_docimpl.h"
#include "xml/dom2_eventsimpl.h"
#include "rendering/render_object.h"
#include "rendering/render_canvas.h"
#include "xml/dom2_eventsimpl.h"
#include "khtml_part.h"

#include <kdebug.h>

using namespace KJS;
using namespace DOM;

// -------------------------------------------------------------------------

JSEventListener::JSEventListener(Object _listener, ObjectImp *_compareListenerImp, const Object &_win, bool _html)
  : listener( _listener ), compareListenerImp( _compareListenerImp ), html( _html ), win( _win )
{
    //fprintf(stderr,"JSEventListener::JSEventListener this=%p listener=%p\n",this,listener.imp());
  if (compareListenerImp) {
    static_cast<Window*>(win.imp())->jsEventListeners.insert(compareListenerImp, this);
  }
}

JSEventListener::~JSEventListener()
{
  if (compareListenerImp) {
    static_cast<Window*>(win.imp())->jsEventListeners.remove(compareListenerImp);
  }
  //fprintf(stderr,"JSEventListener::~JSEventListener this=%p listener=%p\n",this,listener.imp());
}

void JSEventListener::handleEvent(DOM::Event &evt)
{
#ifdef KJS_DEBUGGER
  if (KJSDebugWin::debugWindow() && KJSDebugWin::debugWindow()->inSession())
    return;
#endif
  KHTMLPart *part = ::qt_cast<KHTMLPart *>(static_cast<Window*>(win.imp())->part());
  KJSProxy *proxy = 0L;
  if (part)
    proxy = part->jScript();

  if (proxy && listener.isValid() && listener.implementsCall()) {
    ref();

    KJS::ScriptInterpreter *interpreter = static_cast<KJS::ScriptInterpreter *>(proxy->interpreter());
    ExecState *exec = interpreter->globalExec();

    List args;
    args.append(getDOMEvent(exec,evt));

    // Set "this" to the event's current target
    Object thisObj = Object::dynamicCast(getDOMNode(exec,evt.currentTarget()));
    if ( !thisObj.isValid() ) {
      // Window events (window.onload/window.onresize etc.) must have 'this' set to the window.
      // DocumentImpl::defaultEventHandler sets currentTarget to 0 to mean 'window'.
      thisObj = win;
    }

    Window *window = static_cast<Window*>(win.imp());
    // Set the event we're handling in the Window object
    window->setCurrentEvent( &evt );
    // ... and in the interpreter
    interpreter->setCurrentEvent( &evt );

    KJSCPUGuard guard;
    guard.start();
    Value retval = listener.call(exec, thisObj, args);
    guard.stop();

    window->setCurrentEvent( 0 );
    interpreter->setCurrentEvent( 0 );
    if ( exec->hadException() )
      exec->clearException();
    else if (html)
    {
      QVariant ret = ValueToVariant(exec, retval);
      if (ret.type() == QVariant::Bool && ret.toBool() == false)
        evt.preventDefault();
    }
    window->afterScriptExecution();
    deref();
  }
}

DOM::DOMString JSEventListener::eventListenerType()
{
    if (html)
	return "_khtml_HTMLEventListener";
    else
	return "_khtml_JSEventListener";
}

Object JSEventListener::listenerObj() const
{
  return listener;
}

JSLazyEventListener::JSLazyEventListener(const QString &_code, const QString &_name, const Object &_win, DOM::NodeImpl* _originalNode)
  : JSEventListener(Object(), 0, _win, true),
    code(_code), name(_name),
    parsed(false)
{
  // We don't retain the original node, because we assume it
  // will stay alive as long as this handler object is around
  // and we need to avoid a reference cycle. If JS transfers
  // this handler to another node, parseCode will be called and
  // then originalNode is no longer needed.

  originalNode = _originalNode;
}

JSLazyEventListener::~JSLazyEventListener()
{
  if (listener.isValid()) {
    static_cast<Window*>(win.imp())->jsEventListeners.remove(listener.imp());
  }
}

void JSLazyEventListener::handleEvent(DOM::Event &evt)
{
  parseCode();
  if (listener.isValid()) {
    JSEventListener::handleEvent(evt);
  }
}


Object JSLazyEventListener::listenerObj() const
{
  parseCode();
  return listener;
}

void JSLazyEventListener::parseCode() const
{
  if (!parsed) {
    KHTMLPart *part = ::qt_cast<KHTMLPart *>(static_cast<Window*>(win.imp())->part());
    KJSProxy *proxy = 0L;
    if (part)
      proxy = part->jScript();

    if (proxy) {
      KJS::ScriptInterpreter *interpreter = static_cast<KJS::ScriptInterpreter *>(proxy->interpreter());
      ExecState *exec = interpreter->globalExec();

      //KJS::Constructor constr(KJS::Global::current().get("Function").imp());
      KJS::Object constr = interpreter->builtinFunction();
      KJS::List args;

      static KJS::String eventString("event");

      args.append(eventString);
      args.append(KJS::String(code));
      listener = constr.construct(exec, args); // ### is globalExec ok ?

      if (exec->hadException()) {
        exec->clearException();

        // failed to parse, so let's just make this listener a no-op
        listener = Object();
      } else if (!listener.inherits(&DeclaredFunctionImp::info)) {
        listener = Object();// Error creating function
      } else {
        DeclaredFunctionImp *declFunc = static_cast<DeclaredFunctionImp*>(listener.imp());
        declFunc->setName(Identifier(name));

        if (originalNode)
        {
          // Add the event's home element to the scope
          // (and the document, and the form - see KJS::HTMLElement::eventHandlerScope)
          ScopeChain scope = listener.scope();

          Object thisObj = Object::dynamicCast(getDOMNode(exec, originalNode));

          if (thisObj.isValid()) {
            static_cast<DOMNode*>(thisObj.imp())->pushEventHandlerScope(exec, scope);

            listener.setScope(scope);
          }
        }
      }
    }

    // no more need to keep the unparsed code around
    code = QString();

    if (listener.isValid()) {
      static_cast<Window*>(win.imp())->jsEventListeners.insert(listener.imp(),
                                                               (KJS::JSEventListener *)(this));
    }

    parsed = true;
  }
}

// -------------------------------------------------------------------------

const ClassInfo EventConstructor::info = { "EventConstructor", 0, &EventConstructorTable, 0 };
/*
@begin EventConstructorTable 3
  CAPTURING_PHASE	DOM::Event::CAPTURING_PHASE	DontDelete|ReadOnly
  AT_TARGET		DOM::Event::AT_TARGET		DontDelete|ReadOnly
  BUBBLING_PHASE	DOM::Event::BUBBLING_PHASE	DontDelete|ReadOnly
# Reverse-engineered from Netscape
  MOUSEDOWN		1				DontDelete|ReadOnly
  MOUSEUP		2				DontDelete|ReadOnly
  MOUSEOVER		4				DontDelete|ReadOnly
  MOUSEOUT		8				DontDelete|ReadOnly
  MOUSEMOVE		16				DontDelete|ReadOnly
  MOUSEDRAG		32				DontDelete|ReadOnly
  CLICK			64				DontDelete|ReadOnly
  DBLCLICK		128				DontDelete|ReadOnly
  KEYDOWN		256				DontDelete|ReadOnly
  KEYUP			512				DontDelete|ReadOnly
  KEYPRESS		1024				DontDelete|ReadOnly
  DRAGDROP		2048				DontDelete|ReadOnly
  FOCUS			4096				DontDelete|ReadOnly
  BLUR			8192				DontDelete|ReadOnly
  SELECT		16384				DontDelete|ReadOnly
  CHANGE		32768				DontDelete|ReadOnly
@end
*/

EventConstructor::EventConstructor(ExecState *exec)
  : DOMObject(exec->interpreter()->builtinObjectPrototype())
{
}

Value EventConstructor::tryGet(ExecState *exec, const Identifier &p) const
{
  return DOMObjectLookupGetValue<EventConstructor, DOMObject>(exec,p,&EventConstructorTable,this);
}

Value EventConstructor::getValueProperty(ExecState *, int token) const
{
  // We use the token as the value to return directly
  return Number(token);
}

Value KJS::getEventConstructor(ExecState *exec)
{
  return cacheGlobalObject<EventConstructor>(exec, "[[event.constructor]]");
}

// -------------------------------------------------------------------------

const ClassInfo DOMEvent::info = { "Event", 0, &DOMEventTable, 0 };
/*
@begin DOMEventTable 7
  type		DOMEvent::Type		DontDelete|ReadOnly
  target	DOMEvent::Target	DontDelete|ReadOnly
  currentTarget	DOMEvent::CurrentTarget	DontDelete|ReadOnly
  srcElement	DOMEvent::SrcElement	DontDelete|ReadOnly
  eventPhase	DOMEvent::EventPhase	DontDelete|ReadOnly
  bubbles	DOMEvent::Bubbles	DontDelete|ReadOnly
  cancelable	DOMEvent::Cancelable	DontDelete|ReadOnly
  timeStamp	DOMEvent::TimeStamp	DontDelete|ReadOnly
  returnValue   DOMEvent::ReturnValue   DontDelete
  cancelBubble  DOMEvent::CancelBubble  DontDelete
@end
@begin DOMEventProtoTable 3
  stopPropagation 	DOMEvent::StopPropagation	DontDelete|Function 0
  preventDefault 	DOMEvent::PreventDefault	DontDelete|Function 0
  initEvent		DOMEvent::InitEvent		DontDelete|Function 3
@end
*/
DEFINE_PROTOTYPE("DOMEvent", DOMEventProto)
IMPLEMENT_PROTOFUNC_DOM(DOMEventProtoFunc)
IMPLEMENT_PROTOTYPE(DOMEventProto, DOMEventProtoFunc)