khtml_part.h

手机浏览器源码程序,功能强大

// -*- c-basic-offset: 2 -*-
/* This file is part of the KDE project
 *
 * Copyright (C) 1998, 1999 Torben Weis <[e-mail]>
 *                     1999-2001 Lars Knoll <[e-mail]>
 *                     1999-2001 Antti Koivisto <[e-mail]>
 *                     2000-2001 Simon Hausmann <[e-mail]>
 *                     2000-2001 Dirk Mueller <[e-mail]>
 *                     2000 Stefan Schimanski <[e-mail]>
 * Copyright (C) 2004 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; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
#ifndef __khtml_part_h__
#define __khtml_part_h__

#include "editing/text_granularity.h"
#include "editing/edit_actions.h"

#include <kparts/part.h>
#include <kparts/browserextension.h>

class KHTMLPartPrivate;
class KHTMLPartBrowserExtension;
class KJSProxy;
class KHTMLView;
class KHTMLSettings;
class KJavaAppletContext;
class KHTMLPartOOMStopper;

namespace DOM
{
  class CSSComputedStyleDeclarationImpl;
  class CSSMutableStyleDeclarationImpl;
  class CSSStyleDeclarationImpl;
  class DOMString;
  class Document;
  class DocumentImpl;
  class ElementImpl;
  class EventListener;
  class HTMLAnchorElementImpl;
  class HTMLDocument;
  class HTMLDocumentImpl;
  class HTMLElementImpl;
  class HTMLEventListener;
  class HTMLFormElementImpl;
  class HTMLFrameElementImpl;
  class HTMLIFrameElementImpl;
  class HTMLMetaElementImpl;
  class HTMLObjectElementImpl;
  class HTMLTitleElementImpl;
  class Node;
  class NodeImpl;
  class Range;
}

namespace khtml
{
  class CachedObject;
  struct ChildFrame;
  class CSSStyleSelector;
  class DocLoader;
  class DrawContentsEvent;
  class EditCommandPtr;
  class FormData;
  class HTMLTokenizer;
  class MouseDoubleClickEvent;
  class MouseEvent;
  class MouseMoveEvent;
  class MousePressEvent;
  class MouseReleaseEvent;
  class RenderPart;
  class RenderPartObject;
  class RenderWidget;
  class Selection;
  class XMLTokenizer;
}

namespace KJS {
    class DOMDocument;
    class Selection;
    class SelectionFunc;
    class Window;
    class WindowFunc;
}

namespace KParts
{
  class PartManager;
};

/**
 * This class is khtml's main class. It features an almost complete
 * web browser, and html renderer.
 *
 * The easiest way to use this class (if you just want to display an HTML
 * page at some URL) is the following:
 *
 * <pre>
 * KURL url = "http://www.kde.org";
 * KHTMLPart *w = new KHTMLPart();
 * w->openURL(url);
 * w->view()->resize(500, 400);
 * w->show();
 * </pre>
 *
 * By default Java and JavaScript support are disabled. You can enable them by
 * using the @ref setJavaEnabled() and @ref setJScriptEnabled() methods.
 *
 * Some apps want to write their HTML code directly into the widget instead of
 * it opening an url. You can also do that in the following way:
 *
 * <pre>
 * QString myHTMLCode = ...;
 * KHTMLPart *w = new KHTMLPart();
 * w->begin();
 * w->write(myHTMLCode);
 * ...
 * w->end();
 * </pre>
 *
 * You can do as many calls to write as you want. But there are two
 * @ref write() methods, one accepting a @ref QString one accepting a
 * @p char @p * argument. You should use one or the other
 * (but not both) since the method using
 * the @p char @p * argument does an additional decoding step to convert the
 * written data to Unicode.
 *
 * @short HTML Browser Widget
 * @author Lars Knoll ([e-mail])
 * */
class KHTMLPart : public KParts::ReadOnlyPart
{
  Q_OBJECT
  friend class KHTMLView;
  friend class DOM::HTMLTitleElementImpl;
  friend class DOM::HTMLFrameElementImpl;
  friend class DOM::HTMLIFrameElementImpl;
  friend class DOM::HTMLObjectElementImpl;
  friend class DOM::HTMLAnchorElementImpl;
  friend class DOM::HTMLMetaElementImpl;
  friend class DOM::NodeImpl;
  friend class KHTMLRun;
  friend class DOM::HTMLFormElementImpl;
  friend class khtml::RenderPartObject;
  friend class KJS::Selection;
  friend class KJS::SelectionFunc;
  friend class KJS::Window;
  friend class KJS::WindowFunc;
  friend class KJS::DOMDocument;
  friend class KJSProxy;
  friend class KHTMLPartBrowserExtension;
  friend class DOM::DocumentImpl;
  friend class DOM::HTMLDocumentImpl;
  friend class KHTMLPartBrowserHostExtension;
  friend class khtml::HTMLTokenizer;
  friend class khtml::XMLTokenizer;
  friend class khtml::RenderWidget;
  friend class khtml::CSSStyleSelector;
  friend class KHTMLPartIface;

  Q_PROPERTY( bool javaScriptEnabled READ jScriptEnabled WRITE setJScriptEnabled )
  Q_PROPERTY( bool javaEnabled READ javaEnabled WRITE setJavaEnabled )
  Q_PROPERTY( bool autoloadImages READ autoloadImages WRITE setAutoloadImages )
  Q_PROPERTY( bool dndEnabled READ dndEnabled WRITE setDNDEnabled )
  Q_PROPERTY( bool pluginsEnabled READ pluginsEnabled WRITE setPluginsEnabled )
  Q_PROPERTY( bool onlyLocalReferences READ onlyLocalReferences WRITE setOnlyLocalReferences )
  Q_PROPERTY( QCString dcopObjectId READ dcopObjectId )

public:
  enum GUIProfile { DefaultGUI, BrowserViewGUI /* ... */ };
  enum { NoXPosForVerticalArrowNavigation = INT_MIN };

  /**
   * Constructs a new KHTMLPart.
   *
   * KHTML basically consists of two objects: The KHTMLPart itself,
   * holding the document data (DOM document), and the @ref KHTMLView,
   * derived from @ref QScrollView, in which the document content is
   * rendered in. You can specify two different parent objects for a
   * KHTMLPart, one parent for the KHTMLPart document and on parent
   * for the @ref KHTMLView. If the second @p parent argument is 0L, then
   * @p parentWidget is used as parent for both objects, the part and
   * the view.
   */
  KHTMLPart( QWidget *parentWidget = 0, const char *widgetname = 0,
             QObject *parent = 0, const char *name = 0, GUIProfile prof = DefaultGUI );

  KHTMLPart( KHTMLView *view, QObject *parent = 0, const char *name = 0, GUIProfile prof = DefaultGUI );

  /**
   * Destructor.
   */
  virtual ~KHTMLPart();

  /**
   * Opens the specified URL @p url.
   *
   * Reimplemented from @ref KParts::ReadOnlyPart::openURL .
   */
  virtual bool openURL( const KURL &url );

  void didExplicitOpen();

  /**
   * Stops loading the document and kill all data requests (for images, etc.)
   */
  virtual bool closeURL();

#if !APPLE_CHANGES
  /**
   * is called when a certain error situation (i.e. connection timed out) occured.
   * default implementation either shows a KIO error dialog or loads a more verbose
   * error description a as page, depending on the users configuration.
   * @p job is the job that signaled the error situation
   */
  virtual void showError(KIO::Job* job);
#endif

  /**
   * Returns a reference to the DOM HTML document (for non-HTML documents, returns null)
   */
  DOM::HTMLDocument htmlDocument() const;

  /**
   * Returns a reference to the DOM document.
   */
  DOM::Document document() const;

  /**
   * Returns the node that has the keyboard focus.
   */
  DOM::Node activeNode() const;

  /**
   * Returns a pointer to the @ref KParts::BrowserExtension.
   */
  KParts::BrowserExtension *browserExtension() const;

  /**
   * Returns a pointer to the HTML document's view.
   */
  KHTMLView *view() const;

  /**
   * Enable/disable Javascript support. Note that this will
   * in either case permanently override the default usersetting.
   * If you want to have the default UserSettings, don't call this
   * method.
   */
  void setJScriptEnabled( bool enable );

  /**
   * Returns @p true if Javascript support is enabled or @p false
   * otherwise.
   */
  bool jScriptEnabled() const;

  /**
   * Enable/disable the automatic forwarding by <meta http-equiv="refresh" ....>
   */
  void setMetaRefreshEnabled( bool enable );

  /**
   * Returns @p true if automtaic forwarding is enabled.
   */
  bool metaRefreshEnabled() const;

  /**
   * Execute the specified snippet of JavaScript code.
   *
   * Returns @p true if JavaScript was enabled, no error occured
   * and the code returned true itself or @p false otherwise.
   * @deprecated, use the one below.
   */
  QVariant executeScript( const QString &script, bool forceUserGesture = false );
  /**
   * Same as above except the Node parameter specifying the 'this' value.
   */
  QVariant executeScript( const DOM::Node &n, const QString &script, bool forceUserGesture = false );

  /**
   * Enables or disables Drag'n'Drop support. A drag operation is started if
   * the users drags a link.
   */
  void setDNDEnabled( bool b );
  /**
   * Returns whether Dragn'n'Drop support is enabled or not.
   */
  bool dndEnabled() const;

  /**
   * Implementation of CSS property -khtml-user-drag == auto
   */
  virtual bool shouldDragAutoNode(DOM::NodeImpl*, int x, int y) const;
  
  /**
   * Enables/disables Java applet support. Note that calling this function
   * will permanently override the User settings about Java applet support.
   * Not calling this function is the only way to let the default settings
   * apply.
   */
  void setJavaEnabled( bool enable );

  /**
   * Return if Java applet support is enabled/disabled.
   */
  bool javaEnabled() const;

  /**
   * Returns the java context of the applets. If no applet exists, 0 is returned.
   */
  KJavaAppletContext *javaContext();

  /**
   * Returns the java context of the applets. If no context exists yet, a new one is
   * created.
   */
  KJavaAppletContext *createJavaContext();

  /**
   * Enables or disables plugins via, default is enabled
   */
  void setPluginsEnabled( bool enable );

  /**
   * Returns trie if plugins are enabled/disabled.
   */
  bool pluginsEnabled() const;

  /**
   * Specifies whether images contained in the document should be loaded
   * automatically or not.
   *
   * @note Request will be ignored if called before @ref begin().
   */
  void setAutoloadImages( bool enable );
  /**
   * Returns whether images contained in the document are loaded automatically
   * or not.
   * @note that the returned information is unrelieable as long as no begin()
   * was called.
   */
  bool autoloadImages() const;

  /**
   * Security option.
   *
   * Specify whether only local references ( stylesheets, images, scripts, subdocuments )
   * should be loaded. ( default false - everything is loaded, if the more specific
   * options allow )
   */
  void setOnlyLocalReferences(bool enable);

  /**
   * Returns whether references should be loaded ( default false )
   **/
  bool onlyLocalReferences() const;

#ifndef KDE_NO_COMPAT
  void enableJScript(bool e) { setJScriptEnabled(e); }
  void enableJava(bool e) { setJavaEnabled(e); }
  void enablePlugins(bool e) { setPluginsEnabled(e); }
  void autoloadImages(bool e) { setAutoloadImages(e); }
  void enableMetaRefresh(bool e) { setMetaRefreshEnabled(e); }
  bool setCharset( const QString &, bool ) { return true; }

  KURL baseURL() const;
  QString baseTarget() const;
#endif

  /**
   * Returns the URL for the background Image (used by save background)
   */
  KURL backgroundURL() const;

  /**
   * Schedules a redirection after @p delay seconds.
   */
  void scheduleRedirection(double delay, const QString &url, bool lockHistory = true);

  /**
   * Schedules a location change.
   * This is used for JavaScript-triggered location changes.
   */
  void scheduleLocationChange(const QString &url, const QString &referrer, bool lockHistory = true, bool userGesture = false);
  bool isScheduledLocationChangePending() const;

  /**
   * Schedules a history navigation operation (go forward, go back, etc.).
   * This is used for JavaScript-triggered location changes.
   */
  void scheduleHistoryNavigation( int steps );

  /**
   * Clears the widget and prepares it for new content.
   *
   * If you want @ref url() to return
   * for example "file:/tmp/test.html", you can use the following code:
   * <PRE>
   * view->begin( KURL("file:/tmp/test.html" ) );
   * </PRE>
   *
   * @param url is the url of the document to be displayed.  Even if you
   * are generating the HTML on the fly, it may be useful to specify
   * a directory so that any pixmaps are found.
   *
   * @param xOffset is the initial horizontal scrollbar value. Usually
   * you don't want to use this.
   *
   * @param yOffset is the initial vertical scrollbar value. Usually
   * you don't want to use this.
   *
   * All child frames and the old document are removed if you call
   * this method.
   */
  virtual void begin( const KURL &url = KURL(), int xOffset = 0, int yOffset = 0 );

  /**
   * Writes another part of the HTML code to the widget.
   *
   * You may call
   * this function many times in sequence. But remember: The fewer calls
   * you make, the faster the widget will be.
   *
   * The HTML code is send through a decoder which decodes the stream to
   * Unicode.
   *
   * The @p len parameter is needed for streams encoded in utf-16,
   * since these can have \0 chars in them. In case the encoding
   * you're using isn't utf-16, you can safely leave out the length
   * parameter.
   *
   * Attention: Don't mix calls to @ref write( const char *) with calls
   * to @ref write( const QString & ).
   *
   * The result might not be what you want.
   */
  virtual void write( const char *str, int len = -1 );

  /**
   * Writes another part of the HTML code to the widget.
   *
   * You may call
   * this function many times in sequence. But remember: The fewer calls
   * you make, the faster the widget will be.
   */
  virtual void write( const QString &str );

  /**
   * Call this after your last call to @ref write().
   */
  virtual void end();