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tdelibs/tdehtml/misc/loader.h

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/*
This file is part of the KDE libraries
Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
Copyright (C) 2001-2003 Dirk Mueller <mueller@kde.org>
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; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
This class provides all functionality needed for loading images, style sheets and html
pages from the web. It has a memory cache for these objects.
*/
#ifndef _tdehtml_loader_h
#define _tdehtml_loader_h
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <time.h>
#include "loader_client.h"
#ifdef HAVE_LIBJPEG
#include "loader_jpeg.h"
#endif
#include <stdlib.h>
#include <tqptrlist.h>
#include <tqobject.h>
#include <tqptrdict.h>
#include <tqdict.h>
#include <tqpixmap.h>
#include <tqbuffer.h>
#include <tqstringlist.h>
#include <tqtextcodec.h>
#include <tqtimer.h>
#include <kurl.h>
#include <tdeio/global.h>
#include <tdehtml_settings.h>
#include <dom/dom_string.h>
class TQMovie;
class TDEHTMLPart;
namespace TDEIO {
class Job;
class TransferJob;
}
namespace DOM
{
class CSSStyleSheetImpl;
class DocumentImpl;
}
namespace tdehtml
{
class CachedObject;
class Request;
class DocLoader;
/**
* @internal
*
* A cached object. Classes who want to use this object should derive
* from CachedObjectClient, to get the function calls in case the requested data has arrived.
*
* This class also does the actual communication with tdeio and loads the file.
*/
class CachedObject
{
public:
enum Type {
Image,
CSSStyleSheet,
Script
};
enum Status {
Unknown, // let imagecache decide what to do with it
New, // inserting new image
Pending, // only partially loaded
Persistent, // never delete this pixmap
Cached // regular case
};
CachedObject(const DOM::DOMString &url, Type type, TDEIO::CacheControl _cachePolicy, int size)
: m_url(url), m_type(type), m_cachePolicy(_cachePolicy),
m_expireDate(0), m_size(size)
{
m_status = Pending;
m_accessCount = 0;
m_cachePolicy = _cachePolicy;
m_request = 0;
m_deleted = false;
m_free = false;
m_hadError = false;
m_wasBlocked = false;
m_prev = m_next = 0;
}
virtual ~CachedObject();
virtual void data( TQBuffer &buffer, bool eof) = 0;
virtual void error( int err, const char *text ) = 0;
const DOM::DOMString &url() const { return m_url; }
Type type() const { return m_type; }
virtual void ref(CachedObjectClient *consumer);
virtual void deref(CachedObjectClient *consumer);
int count() const { return m_clients.count(); }
int accessCount() const { return m_accessCount; }
void setStatus(Status s) { m_status = s; }
Status status() const { return m_status; }
virtual void setCharset( const TQString& /*charset*/ ) {}
TQTextCodec* codecForBuffer( const TQString& charset, const TQByteArray& buffer ) const;
int size() const { return m_size; }
bool isLoaded() const { return !m_loading; }
bool free() const { return m_free; }
TDEIO::CacheControl cachePolicy() const { return m_cachePolicy; }
void setRequest(Request *_request);
bool canDelete() const { return (m_clients.count() == 0 && !m_request); }
void setExpireDate(time_t _expireDate) { m_expireDate = _expireDate; }
bool isExpired() const;
virtual bool schedule() const { return false; }
virtual void finish();
/**
* List of acceptable mimetypes separated by ",". A mimetype may contain a wildcard.
*/
// e.g. "text/*"
TQString accept() const { return m_accept; }
void setAccept(const TQString &_accept) { m_accept = _accept; }
protected:
void setSize(int size);
TQPtrDict<CachedObjectClient> m_clients;
DOM::DOMString m_url;
TQString m_accept;
Request *m_request;
Type m_type;
Status m_status;
int m_accessCount;
TDEIO::CacheControl m_cachePolicy;
time_t m_expireDate;
int m_size;
bool m_deleted : 1;
bool m_loading : 1;
bool m_free : 1;
bool m_hadError : 1;
bool m_wasBlocked : 1;
private:
bool allowInLRUList() const { return canDelete() && !m_free && status() != Persistent; }
CachedObject* m_next;
CachedObject* m_prev;
friend class Cache;
friend class ::TDEHTMLPart;
};
/**
* a cached style sheet. also used for loading xml documents.
*
* ### rename to CachedTextDoc or something since it's more generic than just for css
*/
class CachedCSSStyleSheet : public CachedObject
{
public:
CachedCSSStyleSheet(DocLoader* dl, const DOM::DOMString &url, TDEIO::CacheControl cachePolicy,
const char *accept);
CachedCSSStyleSheet(const DOM::DOMString &url, const TQString &stylesheet_data);
const DOM::DOMString &sheet() const { return m_sheet; }
virtual void ref(CachedObjectClient *consumer);
virtual void data( TQBuffer &buffer, bool eof );
virtual void error( int err, const char *text );
virtual bool schedule() const { return true; }
void setCharsetHint( const TQString& charset ) { m_charsetHint = charset; }
void setCharset( const TQString& charset ) { m_charset = charset; }
protected:
void checkNotify();
DOM::DOMString m_sheet;
TQString m_charset;
TQString m_charsetHint;
int m_err;
TQString m_errText;
};
/**
* a cached script
*/
class CachedScript : public CachedObject
{
public:
CachedScript(DocLoader* dl, const DOM::DOMString &url, TDEIO::CacheControl cachePolicy, const char* accept );
CachedScript(const DOM::DOMString &url, const TQString &script_data);
const DOM::DOMString &script() const { return m_script; }
virtual void ref(CachedObjectClient *consumer);
virtual void data( TQBuffer &buffer, bool eof );
virtual void error( int err, const char *text );
virtual bool schedule() const { return false; }
void checkNotify();
bool isLoaded() const { return !m_loading; }
void setCharset( const TQString& charset ) { m_charset = charset; }
protected:
TQString m_charset;
DOM::DOMString m_script;
};
class ImageSource;
/**
* a cached image
*/
class CachedImage : public TQObject, public CachedObject
{
TQ_OBJECT
public:
CachedImage(DocLoader* dl, const DOM::DOMString &url, TDEIO::CacheControl cachePolicy, const char* accept);
virtual ~CachedImage();
const TQPixmap &pixmap() const;
const TQPixmap &scaled_pixmap(int xWidth, int xHeight);
const TQPixmap &tiled_pixmap(const TQColor& bg, int xWidth = -1, int xHeight = -1);
TQSize pixmap_size() const; // returns the size of the complete (i.e. when finished) loading
TQRect valid_rect() const; // returns the rectangle of pixmap that has been loaded already
bool canRender() const { return !isErrorImage() && pixmap_size().width() > 0 && pixmap_size().height() > 0; }
void ref(CachedObjectClient *consumer);
virtual void deref(CachedObjectClient *consumer);
virtual void data( TQBuffer &buffer, bool eof );
virtual void error( int err, const char *text );
bool isTransparent() const { return isFullyTransparent; }
bool isErrorImage() const { return m_hadError; }
bool isBlockedImage() const { return m_wasBlocked; }
const TQString& suggestedFilename() const { return m_suggestedFilename; }
void setSuggestedFilename( const TQString& s ) { m_suggestedFilename = s; }
#ifdef IMAGE_TITLES
const TQString& suggestedTitle() const { return m_suggestedTitle; }
void setSuggestedTitle( const TQString& s ) { m_suggestedTitle = s; }
#else
const TQString& suggestedTitle() const { return m_suggestedFilename; }
#endif
void setShowAnimations( TDEHTMLSettings::KAnimationAdvice );
void pauseAnimations();
void resumeAnimations();
virtual bool schedule() const { return true; }
virtual void finish();
protected:
void clear();
private slots:
/**
* gets called, whenever a TQMovie changes frame
*/
void movieUpdated( const TQRect &rect );
void movieStatus(int);
void movieResize(const TQSize&);
void deleteMovie();
private:
void do_notify(const TQPixmap& p, const TQRect& r);
TQString m_suggestedFilename;
#ifdef IMAGE_TITLES
TQString m_suggestedTitle;
#endif
TQMovie* m;
TQPixmap* p;
TQPixmap* scaled;
TQPixmap* bg;
TQRgb bgColor;
TQSize bgSize;
mutable TQPixmap* pixPart;
ImageSource* imgSource;
const char* formatType; // Is the name of the movie format type
int width;
int height;
// Is set if movie format type ( incremental/animation) was checked
bool typeChecked : 1;
bool isFullyTransparent : 1;
bool monochrome : 1;
TDEHTMLSettings::KAnimationAdvice m_showAnimations : 2;
friend class Cache;
friend class ::TDEHTMLPart;
};
/**
* @internal
*
* Manages the loading of scripts/images/stylesheets for a particular document
*/
class DocLoader
{
public:
DocLoader(TDEHTMLPart*, DOM::DocumentImpl*);
~DocLoader();
CachedImage *requestImage( const DOM::DOMString &url);
CachedCSSStyleSheet *requestStyleSheet( const DOM::DOMString &url, const TQString& charsetHint,
const char *accept = "text/css", bool userSheet = false );
CachedScript *requestScript( const DOM::DOMString &url, const TQString& charset);
bool autoloadImages() const { return m_bautoloadImages; }
TDEIO::CacheControl cachePolicy() const { return m_cachePolicy; }
TDEHTMLSettings::KAnimationAdvice showAnimations() const { return m_showAnimations; }
time_t expireDate() const { return m_expireDate; }
TDEHTMLPart* part() const { return m_part; }
DOM::DocumentImpl* doc() const { return m_doc; }
void setCacheCreationDate( time_t );
void setExpireDate( time_t, bool relative );
void setAutoloadImages( bool );
void setCachePolicy( TDEIO::CacheControl cachePolicy ) { m_cachePolicy = cachePolicy; }
void setShowAnimations( TDEHTMLSettings::KAnimationAdvice );
void pauseAnimations();
void resumeAnimations();
void insertCachedObject( CachedObject* o ) const;
void removeCachedObject( CachedObject* o) const { m_docObjects.remove( o ); }
private:
bool needReload(CachedObject *existing, const TQString &fullUrl);
friend class Cache;
friend class DOM::DocumentImpl;
friend class ::TDEHTMLPart;
TQStringList m_reloadedURLs;
mutable TQPtrDict<CachedObject> m_docObjects;
time_t m_expireDate;
time_t m_creationDate;
TDEIO::CacheControl m_cachePolicy;
bool m_bautoloadImages : 1;
TDEHTMLSettings::KAnimationAdvice m_showAnimations : 2;
TDEHTMLPart* m_part;
DOM::DocumentImpl* m_doc;
};
/**
* @internal
*/
class Request
{
public:
Request(DocLoader* dl, CachedObject *_object, bool _incremental);
~Request();
bool incremental;
TQBuffer m_buffer;
CachedObject *object;
DocLoader* m_docLoader;
};
/**
* @internal
*/
class Loader : public TQObject
{
TQ_OBJECT
public:
Loader();
void load(DocLoader* dl, CachedObject *object, bool incremental = true);
int numRequests( DocLoader* dl ) const;
void cancelRequests( DocLoader* dl );
// may return 0L
TDEIO::Job *jobForRequest( const DOM::DOMString &url ) const;
signals:
void requestStarted( tdehtml::DocLoader* dl, tdehtml::CachedObject* obj );
void requestDone( tdehtml::DocLoader* dl, tdehtml::CachedObject *obj );
void requestFailed( tdehtml::DocLoader* dl, tdehtml::CachedObject *obj );
protected slots:
void slotFinished( TDEIO::Job * );
void slotData( TDEIO::Job *, const TQByteArray & );
void servePendingRequests();
protected:
TQPtrList<Request> m_requestsPending;
TQPtrDict<Request> m_requestsLoading;
#ifdef HAVE_LIBJPEG
KJPEGFormatType m_jpegloader;
#endif
TQTimer m_timer;
};
/**
* @internal
*
* Provides a cache/loader for objects needed for displaying the html page.
* At the moment these are stylesheets, scripts and images
*/
class Cache
{
friend class DocLoader;
template<typename CachedObjectType, enum CachedObject::Type CachedType>
static CachedObjectType* requestObject( DocLoader* dl, const KURL& kurl, const char* accept );
public:
/**
* init the cache in case it's not already. This needs to get called once
* before using it.
*/
KDE_EXPORT static void init();
/**
* Ask the cache for some url. Will return a cachedObject, and
* load the requested data in case it's not cached
* if the DocLoader is zero, the url must be full-qualified.
* Otherwise, it is automatically base-url expanded
*/
// static CachedImage *requestImage(const KURL& url)
// { return Cache::requestObject<CachedImage, CachedObject::Image>( 0, url, 0 ); }
/**
* Pre-loads a stylesheet into the cache.
*/
static void preloadStyleSheet(const TQString &url, const TQString &stylesheet_data);
/**
* Pre-loads a script into the cache.
*/
static void preloadScript(const TQString &url, const TQString &script_data);
static void setSize( int bytes );
static int size() { return maxSize; };
static void statistics();
KDE_EXPORT static void flush(bool force=false);
/**
* clears the cache
* Warning: call this only at the end of your program, to clean
* up memory (useful for finding memory holes)
*/
KDE_EXPORT static void clear();
static Loader *loader() { return m_loader; }
static TQPixmap *nullPixmap;
static TQPixmap *brokenPixmap;
static TQPixmap *blockedPixmap;
static int cacheSize;
static void removeCacheEntry( CachedObject *object );
private:
static void checkLRUAndUncacheableListIntegrity();
friend class CachedObject;
static TQDict<CachedObject> *cache;
static TQPtrList<DocLoader>* docloader;
static TQPtrList<CachedObject> *freeList;
static void insertInLRUList(CachedObject*);
static void removeFromLRUList(CachedObject*);
static int totalSizeOfLRU;
static int maxSize;
static Loader *m_loader;
};
} // namespace
#endif