/***************************************************************************
 *   Copyright (C) 2004-2005 by Enrico Ros <eros.kde@email.it>             *
 *   Copyright (C) 2004-2008 by Albert Astals Cid <aacid@kde.org>          *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 ***************************************************************************/

#ifndef _OKULAR_DOCUMENT_H_
#define _OKULAR_DOCUMENT_H_

#include "okular_export.h"
#include "area.h"
#include "global.h"
#include "pagesize.h"

#include <QtCore/QObject>
#include <QtCore/QStringList>
#include <QtCore/QVector>
#include <QtGui/QPrinter>
#include <QtXml/QDomDocument>

#include <kmimetype.h>

class QPrintDialog;
class KComponentData;
class KBookmark;
class KConfigDialog;
class KXMLGUIClient;
class KUrl;

namespace Okular {

class Annotation;
class BookmarkManager;
class DocumentInfo;
class DocumentObserver;
class DocumentPrivate;
class DocumentSynopsis;
class DocumentViewport;
class EmbeddedFile;
class ExportFormat;
class FontInfo;
class Generator;
class Action;
class Page;
class PixmapRequest;
class SourceReference;
class View;
class VisiblePageRect;

/** IDs for seaches. Globally defined here. **/
#define PART_SEARCH_ID 1
#define PAGEVIEW_SEARCH_ID 2
#define SW_SEARCH_ID 3
#define PRESENTATION_SEARCH_ID 4


/**
 * @short The Document. Heart of everything. Actions take place here.
 *
 * The Document is the main object in Okular. All views query the Document to
 * get data/properties or even for accessing pages (in a 'const' way).
 *
 * It is designed to keep it detached from the document type (pdf, ps, you
 * name it..) so whenever you want to get some data, it asks its internals
 * generator to do the job and return results in a format-indepedent way.
 *
 * Apart from the generator (the currently running one) the document stores
 * all the Pages ('Page' class) of the current document in a vector and
 * notifies all the registered DocumentObservers when some content changes.
 *
 * For a better understanding of hieracies @see README.internals.png
 * @see DocumentObserver, Page
 */
class OKULAR_EXPORT Document : public QObject
{
    Q_OBJECT

    public:
        /**
         * Creates a new document with the given @p widget as widget to relay GUI things (messageboxes, ...).
         */
        explicit Document( QWidget *widget );

        /**
         * Destroys the document.
         */
        ~Document();

        /**
         * Opens the document.
         */
        bool openDocument( const QString & docFile, const KUrl & url, const KMimeType::Ptr &mime );

        /**
         * Closes the document.
         */
        void closeDocument();

        /**
         * Registers a new @p observer for the document.
         */
        void addObserver( DocumentObserver *observer );

        /**
         * Unregisters the given @p observer for the document.
         */
        void removeObserver( DocumentObserver *observer );

        /**
         * Reparses and applies the configuration.
         */
        void reparseConfig();

        /**
         * Returns the widget to be used for relaying GUI things (messageboxes, ...)
         */
        QWidget *widget() const;

        /**
         * Returns whether the document is currently opened.
         */
        bool isOpened() const;

        /**
         * Returns the meta data of the document or 0 if no meta data
         * are available.
         */
        const DocumentInfo * documentInfo() const;

        /**
         * Returns the table of content of the document or 0 if no
         * table of content is available.
         */
        const DocumentSynopsis * documentSynopsis() const;

        /**
         * Starts the reading of the information about the fonts in the
         * document, if available.
         *
         * The results as well the end of the reading is notified using the
         * signals gotFont(), fontReadingProgress() and fontReadingEnded()
         */
        void startFontReading();

        /**
         * Force the termination of the reading of the information about the
         * fonts in the document, if running.
         */
        void stopFontReading();

        /**
         * Whether the current document can provide information about the
         * fonts used in it.
         */
        bool canProvideFontInformation() const;

        /**
         * Returns the list of embedded files or 0 if no embedded files
         * are available.
         */
        const QList<EmbeddedFile*> *embeddedFiles() const;

        /**
         * Returns the page object for the given page @p number or 0
         * if the number is out of range.
         */
        const Page * page( int number ) const;

        /**
         * Returns the current viewport of the document.
         */
        const DocumentViewport & viewport() const;

        /**
         * Sets the list of visible page rectangles.
         * @see VisiblePageRect
         */
        void setVisiblePageRects( const QVector< VisiblePageRect * > & visiblePageRects, int excludeId = -1 );

        /**
         * Returns the list of visible page rectangles.
         */
        const QVector< VisiblePageRect * > & visiblePageRects() const;

        /**
         * Returns the number of the current page.
         */
        uint currentPage() const;

        /**
         * Returns the number of pages of the document.
         */
        uint pages() const;

        /**
         * Returns the url of the currently opened document.
         */
        KUrl currentDocument() const;

        /**
         * Returns whether the given @p action is allowed in the document.
         * @see @ref Permission
         */
        bool isAllowed( Permission action ) const;

        /**
         * Returns whether the document supports searching.
         */
        bool supportsSearching() const;

        /**
         * Returns whether the document supports the listing of page sizes.
         */
        bool supportsPageSizes() const;

        /**
         * Returns the list of supported page sizes or an empty list if this
         * feature is not available.
         * @see supportsPageSizes()
         */
        PageSize::List pageSizes() const;

        /**
         * Returns whether the document supports the export to ASCII text.
         */
        bool canExportToText() const;

        /**
         * Exports the document as ASCII text and saves it under @p fileName.
         */
        bool exportToText( const QString& fileName ) const;

        /**
         * Returns the list of supported export formats.
         * @see ExportFormat
         */
        QList<ExportFormat> exportFormats() const;

        /**
         * Exports the document in the given @p format and saves it under @p fileName.
         */
        bool exportTo( const QString& fileName, const ExportFormat& format ) const;

        /**
         * Returns whether the document history is at the begin.
         */
        bool historyAtBegin() const;

        /**
         * Returns whether the document history is at the end.
         */
        bool historyAtEnd() const;

        /**
         * Returns the meta data for the given @p key and @p option or an empty variant
         * if the key doesn't exists.
         */
        QVariant metaData( const QString & key, const QVariant & option = QVariant() ) const;

        /**
         * Returns the current rotation of the document.
         */
        Rotation rotation() const;

        /**
         * If all pages have the same size this method returns it, if the page sizes
         * differ an empty size object is returned.
         */
        QSizeF allPagesSize() const;

        /**
         * Returns the size string for the given @p page or an empty string
         * if the page is out of range.
         */
        QString pageSizeString( int page ) const;

        /**
         * Returns the gui client of the generator, if it provides one.
         */
        KXMLGUIClient* guiClient();

        /**
         * Sets the current document viewport to the given @p page.
         *
         * @param excludeId The observer ids which shouldn't be effected by this change.
         * @param smoothMove Whether the move shall be animated smoothly.
         */
        void setViewportPage( int page, int excludeId = -1, bool smoothMove = false );

        /**
         * Sets the current document viewport to the given @p viewport.
         *
         * @param excludeId The observer ids which shouldn't be effected by this change.
         * @param smoothMove Whether the move shall be animated smoothly.
         */
        void setViewport( const DocumentViewport &viewport, int excludeId = -1, bool smoothMove = false );

        /**
         * Sets the current document viewport to the next viewport in the
         * viewport history.
         */
        void setPrevViewport();

        /**
         * Sets the current document viewport to the previous viewport in the
         * viewport history.
         */
        void setNextViewport();

        /**
         * Sets the next @p viewport in the viewport history.
         */
        void setNextDocumentViewport( const DocumentViewport &viewport );

        /**
         * Sets the next @p namedDestination in the viewport history.
         *
         * @since 0.9 (KDE 4.3)
         */
        void setNextDocumentDestination( const QString &namedDestination );

        /**
         * Sets the zoom for the current document.
         *
         * @param excludeId The observer ids which shouldn't be effected by this change.
         */
        void setZoom( int factor, int excludeId = -1 );

        /**
         * Describes the possible options for the pixmap requests.
         */
        enum PixmapRequestFlag
        {
            NoOption = 0,                ///< No options
            RemoveAllPrevious = 1        ///< Remove all the previous requests, even for non requested page pixmaps
        };
        Q_DECLARE_FLAGS( PixmapRequestFlags, PixmapRequestFlag )

        /**
         * Sends @p requests for pixmap generation.
         *
         * The same as requestPixmaps( requests, RemoveAllPrevious );
         */
        void requestPixmaps( const QLinkedList<PixmapRequest*> &requests );

        /**
         * Sends @p requests for pixmap generation.
         *
         * @param reqOptions the options for the request
         *
         * @since 0.7 (KDE 4.1)
         */
        void requestPixmaps( const QLinkedList<PixmapRequest*> &requests, PixmapRequestFlags reqOptions );

        /**
         * Sends a request for text page generation for the given page @p number.
         */
        void requestTextPage( uint number );

        /**
         * Adds a new @p annotation to the given @p page.
         */
        void addPageAnnotation( int page, Annotation *annotation );

        /**
         * Modifies the given @p annotation on the given @p page.
         */
        void modifyPageAnnotation( int page, Annotation *annotation );

        /**
         * Removes the given @p annotation from the given @p page.
         */
        void removePageAnnotation( int page, Annotation *annotation );

        /**
         * Removes the given @p annotations from the given @p page.
         */
        void removePageAnnotations( int page, const QList<Annotation*> &annotations );

        /**
         * Sets the text selection for the given @p page.
         *
         * @param rect The rectangle of the selection.
         * @param color The color of the selection.
         */
        void setPageTextSelection( int page, RegularAreaRect * rect, const QColor & color );

        /**
         * Describes the possible search types.
         */
        enum SearchType
        {
            NextMatch,      ///< Search next match
            PreviousMatch,  ///< Search previous match
            AllDocument,    ///< Search complete document
            GoogleAll,      ///< Search all words in google style
            GoogleAny       ///< Search any words in google style
        };

        /**
         * Describes how search ended
         */
        enum SearchStatus
        {
            MatchFound,        ///< Any match was found
            NoMatchFound,      ///< No match was found
            SearchCancelled    ///< The search was cancelled
        };

        /**
         * Searches the given @p text in the document.
         *
         * @param searchID The unique id for this search request.
         * @param fromStart Whether the search should be started at begin of the document.
         * @param caseSensitivity Whether the search is case sensitive.
         * @param type The type of the search. @ref SearchType
         * @param moveViewport Whether the viewport shall be moved to the position of the matches.
         * @param color The highlighting color of the matches.
         * @param noDialogs Whether a search dialog shall be shown.
         */
        void searchText( int searchID, const QString & text, bool fromStart, Qt::CaseSensitivity caseSensitivity,
                         SearchType type, bool moveViewport, const QColor & color, bool noDialogs = false );

        /**
         * Continues the search for the given @p searchID.
         */
        void continueSearch( int searchID );

        /**
         * Continues the search for the given @p searchID, optionally specifying
         * a new direction for the search.
         *
         * @since 0.7 (KDE 4.1)
         */
        void continueSearch( int searchID, SearchType type );

        /**
         * Resets the search for the given @p searchID.
         */
        void resetSearch( int searchID );

        /**
         * Returns the bookmark manager of the document.
         */
        BookmarkManager * bookmarkManager() const;

        /**
         * Processes the given @p action.
         */
        void processAction( const Action *action );

        /**
         * Returns a list of the bookmarked.pages
         */
        QList<int> bookmarkedPageList() const;

        /**
         * Returns the range of the bookmarked.pages
         */
        QString bookmarkedPageRange() const;

        /**
         * Processes/Executes the given source @p reference.
         */
        void processSourceReference( const SourceReference *reference );

        /**
         * Returns whether the document can configure the printer itself.
         */
        bool canConfigurePrinter() const;

        /**
         * What type of printing a document supports
         */
        enum PrintingType
        {
            NoPrinting,            ///< Printing Not Supported
            NativePrinting,        ///< Native Cross-Platform Printing
            PostscriptPrinting     ///< Postscript file printing
        };

        /**
         * Returns what sort of printing the document supports:
         *   Native, Postscript, None
         */
        PrintingType printingSupport() const;

        /**
         * Returns whether the document supports printing to both PDF and PS files.
         */
        bool supportsPrintToFile() const;

        /**
         * Prints the document to the given @p printer.
         */
        bool print( QPrinter &printer );
        
        /**
         * Returns the last print error in case print() failed
         * @since 0.11 (KDE 4.5)
         */
        QString printError() const;

        /**
         * Returns a custom printer configuration page or 0 if no
         * custom printer configuration page is available.
         */
        QWidget* printConfigurationWidget() const;

        /**
         * Fill the KConfigDialog @p dialog with the setting pages of the
         * generators.
         */
        void fillConfigDialog( KConfigDialog * dialog );

        /**
         * Returns the number of generators that have a configuration widget.
         */
        int configurableGenerators() const;

        /**
         * Returns the list with the supported MIME types.
         */
        QStringList supportedMimeTypes() const;

        /**
         * Returns the component data associated with the generator. May be null.
         */
        const KComponentData* componentData() const;

        /**
         * Returns whether the changes to the document (modified annotations,
         * values in form fields, etc) can be saved to another document.
         *
         * @since 0.7 (KDE 4.1)
         */
        bool canSaveChanges() const;

        /**
         * Save the document and the optional changes to it to the specified
         * @p fileName.
         *
         * @since 0.7 (KDE 4.1)
         */
        bool saveChanges( const QString &fileName );

        /**
         * Save the document and the optional changes to it to the specified
         * @p fileName and returns a @p errorText if fails.
         *
         * @since 0.10 (KDE 4.4)
         */
        bool saveChanges( const QString &fileName, QString *errorText );

        /**
         * Register the specified @p view for the current document.
         *
         * It is unregistered from the previous document, if any.
         *
         * @since 0.7 (KDE 4.1)
         */
        void registerView( View *view );

        /**
         * Unregister the specified @p view from the current document.
         *
         * @since 0.7 (KDE 4.1)
         */
        void unregisterView( View *view );

        /**
         * Gets the font data for the given font
         *
         * @since 0.8 (KDE 4.2)
         */
        QByteArray fontData(const FontInfo &font) const;

        /**
         * Opens a document archive.
         *
         * @since 0.8 (KDE 4.2)
         */
        bool openDocumentArchive( const QString & docFile, const KUrl & url );

        /**
         * Saves a document archive.
         *
         * @since 0.8 (KDE 4.2)
         */
        bool saveDocumentArchive( const QString &fileName );

        /**
         * Asks the generator to dynamically generate a SourceReference for a given
         * page number and absolute X and Y position on this page.
         *
         * @attention Ownership of the returned SourceReference is transferred to the caller.
         * @note This method does not call processSourceReference( const SourceReference * )
         *
         * @since 0.10 (KDE 4.4)
        */
        const SourceReference * dynamicSourceReference( int pageNr, double absX, double absY );

        /**
         * Returns the orientation of the document (for printing purposes). This
         * is used in the KPart to initialize the print dialog and in the
         * generators to check whether the document needs to be rotated or not.
         *
         * @since 0.14 (KDE 4.8)
        */
        QPrinter::Orientation orientation() const;


    public Q_SLOTS:
        /**
         * This slot is called whenever the user changes the @p rotation of
         * the document.
         */
        void setRotation( int rotation );

        /**
         * This slot is called whenever the user changes the page @p size
         * of the document.
         */
        void setPageSize( const PageSize &size );

        /**
         * Cancels the current search
         */
        void cancelSearch();


    Q_SIGNALS:
        /**
         * This signal is emitted whenever an action requests a
         * document close operation.
         */
        void close();

        /**
         * This signal is emitted whenever an action requests an
         * application quit operation.
         */
        void quit();

        /**
         * This signal is emitted whenever an action requests a
         * find operation.
         */
        void linkFind();

        /**
         * This signal is emitted whenever an action requests a
         * goto operation.
         */
        void linkGoToPage();

        /**
         * This signal is emitted whenever an action requests a
         * start presentation operation.
         */
        void linkPresentation();

        /**
         * This signal is emitted whenever an action requests an
         * end presentation operation.
         */
        void linkEndPresentation();

        /**
         * This signal is emitted whenever an action requests an
         * open url operation for the given document @p url.
         */
        void openUrl( const KUrl &url );

        /**
         * This signal is emitted whenever an error occurred.
         *
         * @param text The description of the error.
         * @param duration The time in seconds the message should be shown to the user.
         */
        void error( const QString &text, int duration );

        /**
         * This signal is emitted to signal a warning.
         *
         * @param text The description of the warning.
         * @param duration The time in seconds the message should be shown to the user.
         */
        void warning( const QString &text, int duration );

        /**
         * This signal is emitted to signal a notice.
         *
         * @param text The description of the notice.
         * @param duration The time in seconds the message should be shown to the user.
         */
        void notice( const QString &text, int duration );

        /**
         * Emitted when a new font is found during the reading of the fonts of
         * the document.
         */
        void gotFont( const Okular::FontInfo& font );

        /**
         * Reports the progress when reading the fonts in the document.
         *
         * \param page is the page that was just finished to scan for fonts
         */
        void fontReadingProgress( int page );

        /**
         * Reports that the reading of the fonts in the document is finished.
         */
        void fontReadingEnded();

        /**
         * Reports that the current search finished
         */
        void searchFinished( int id, Okular::Document::SearchStatus endStatus );

        /**
         * This signal is emitted whenever a source reference with the given parameters has been
         * activated.
         *
         * \param handled should be set to 'true' if a slot handles this source reference; the
         *                default action to launch the configured editor will then not be performed
         *                by the document
         *
         * @since 0.14 (KDE 4.8)
         */
        void sourceReferenceActivated(const QString& absFileName, int line, int col, bool *handled);

    private:
        /// @cond PRIVATE
        friend class DocumentPrivate;
        /// @endcond
        DocumentPrivate *const d;

        Q_DISABLE_COPY( Document )

        Q_PRIVATE_SLOT( d, void saveDocumentInfo() const )
        Q_PRIVATE_SLOT( d, void slotTimedMemoryCheck() )
        Q_PRIVATE_SLOT( d, void sendGeneratorRequest() )
        Q_PRIVATE_SLOT( d, void rotationFinished( int page, Okular::Page *okularPage ) )
        Q_PRIVATE_SLOT( d, void fontReadingProgress( int page ) )
        Q_PRIVATE_SLOT( d, void fontReadingGotFont( const Okular::FontInfo& font ) )
        Q_PRIVATE_SLOT( d, void slotGeneratorConfigChanged( const QString& ) )
        Q_PRIVATE_SLOT( d, void refreshPixmaps( int ) )
        Q_PRIVATE_SLOT( d, void _o_configChanged() )

        // search thread simulators
        Q_PRIVATE_SLOT( d, void doContinueNextMatchSearch(void *pagesToNotifySet, void * match, int currentPage, int searchID, const QString & text, int caseSensitivity, bool moveViewport, const QColor & color, bool noDialogs, int donePages) )
        Q_PRIVATE_SLOT( d, void doContinuePrevMatchSearch(void *pagesToNotifySet, void * match, int currentPage, int searchID, const QString & text, int caseSensitivity, bool moveViewport, const QColor & color, bool noDialogs, int donePages) )
        Q_PRIVATE_SLOT( d, void doContinueAllDocumentSearch(void *pagesToNotifySet, void *pageMatchesMap, int currentPage, int searchID, const QString & text, int caseSensitivity, const QColor & color) )
        Q_PRIVATE_SLOT( d, void doContinueGooglesDocumentSearch(void *pagesToNotifySet, void *pageMatchesMap, int currentPage, int searchID, const QStringList & words, int caseSensitivity, const QColor & color, bool matchAll) )
};


/**
 * @short A view on the document.
 *
 * The Viewport structure is the 'current view' over the document. Contained
 * data is broadcasted between observers to synchronize their viewports to get
 * the 'I scroll one view and others scroll too' views.
 */
class OKULAR_EXPORT DocumentViewport
{
    public:
        /**
         * Creates a new viewport for the given page @p number.
         */
        DocumentViewport( int number = -1 );

        /**
         * Creates a new viewport from the given xml @p description.
         */
        DocumentViewport( const QString &description );

        /**
         * Returns the viewport as xml description.
         */
        QString toString() const;

        /**
         * Returns whether the viewport is valid.
         */
        bool isValid() const;

        /**
         * @internal
         */
        bool operator==( const DocumentViewport &other ) const;

        /**
         * The number of the page nearest the center of the viewport.
         */
        int pageNumber;

        /**
         * Describes the relative position of the viewport.
         */
        enum Position
        {
            Center = 1,  ///< Relative to the center of the page.
            TopLeft = 2  ///< Relative to the top left corner of the page.
        };

        /**
         * If 'rePos.enabled == true' then this structure contains the
         * viewport center or top left depending on the value of pos.
         */
        struct {
            bool enabled;
            double normalizedX;
            double normalizedY;
            Position pos;
        } rePos;

        /**
         * If 'autoFit.enabled == true' then the page must be autofitted in the viewport.
         */
        struct {
            bool enabled;
            bool width;
            bool height;
        } autoFit;
};

/**
 * @short A DOM tree containing information about the document.
 *
 * The DocumentInfo structure can be filled in by generators to display
 * metadata about the currently opened file.
 */
class OKULAR_EXPORT DocumentInfo : public QDomDocument
{
    public:
        /**
         * The list of predefined keys.
         */
        enum Key {
            Title,              ///< The title of the document
            Subject,            ///< The subject of the document
            Description,        ///< The description of the document
            Author,             ///< The author of the document
            Creator,            ///< The creator of the document (this can be different from the author)
            Producer,           ///< The producer of the document (e.g. some software)
            Copyright,          ///< The copyright of the document
            Pages,              ///< The number of pages of the document
            CreationDate,       ///< The date of creation of the document
            ModificationDate,   ///< The date of last modification of the document
            MimeType,           ///< The mime type of the document
            Category,           ///< The category of the document
            Keywords,           ///< The keywords which describe the content of the document
            FilePath,           ///< The path of the file @since 0.10 (KDE 4.4)
            DocumentSize,       ///< The size of the document @since 0.10 (KDE 4.4)
            PagesSize           ///< The size of the pages (if all pages have the same size) @since 0.10 (KDE 4.4)
        };

        /**
         * Creates a new document info.
         */
        DocumentInfo();

        /**
         * Sets a value for a special key. The title should be an i18n'ed
         * string, since it's used in the document information dialog.
         */
        void set( const QString &key, const QString &value,
                  const QString &title = QString() );

        /**
         * Sets the value for a predefined key. You should use this method
         * whenever a predefined key exists for your value.
         */
        void set( Key key, const QString &value );

        /**
         * Returns the value for a given key or an empty string when the
         * key doesn't exist.
         */
        QString get( const QString &key ) const;

        /**
         * Returns the internal string for the given key
         * @since 0.10 (KDE 4.4)
         */
        static QString getKeyString( Key key );

        /**
         * Returns the user visible string for the given key
         * @since 0.10 (KDE 4.4)
         */
        static QString getKeyTitle( Key key );

};

/**
 * @short A DOM tree that describes the Table of Contents.
 *
 * The Synopsis (TOC or Table Of Contents for friends) is represented via
 * a dom tree where each node has an internal name (displayed in the TOC)
 * and one or more attributes.
 *
 * In the tree the tag name is the 'screen' name of the entry. A tag can have
 * attributes. Here follows the list of tag attributes with meaning:
 * - Destination: A string description of the referred viewport
 * - DestinationName: A 'named reference' to the viewport that must be converted
 *      using metaData( "NamedViewport", viewport_name )
 * - ExternalFileName: A document to be opened, whose destination is specified
 *      with Destination or DestinationName
 * - Open: a boolean saying whether its TOC branch is open or not (default: false)
 * - URL: a URL to be open as destination; if set, no other Destination* or
 *      ExternalFileName entry is used
 */
class OKULAR_EXPORT DocumentSynopsis : public QDomDocument
{
    public:
        /**
         * Creates a new document synopsis object.
         */
        DocumentSynopsis();

        /**
         * Creates a new document synopsis object with the given
         * @p document as parent node.
         */
        DocumentSynopsis( const QDomDocument &document );
};

/**
 * @short An embedded file into the document.
 *
 * This class represents a sort of interface of an embedded file in a document.
 *
 * Generators \b must re-implement its members to give the all the information
 * about an embedded file, like its name, its description, the date of creation
 * and modification, and the real data of the file.
 */
class OKULAR_EXPORT EmbeddedFile
{
    public:
        /**
         * Creates a new embedded file.
         */
        EmbeddedFile();

        /**
         * Destroys the embedded file.
         */
        virtual ~EmbeddedFile();

        /**
         * Returns the name of the file
         */
        virtual QString name() const = 0;

        /**
         * Returns the description of the file, or an empty string if not
         * available
         */
        virtual QString description() const = 0;

        /**
         * Returns the real data representing the file contents
         */
        virtual QByteArray data() const = 0;

        /**
         * Returns the size (in bytes) of the file, if available, or -1 otherwise.
         *
         * @note this method should be a fast way to know the size of the file
         * with no need to extract all the data from it
         */
        virtual int size() const = 0;

        /**
         * Returns the modification date of the file, or an invalid date
         * if not available
         */
        virtual QDateTime modificationDate() const = 0;

        /**
         * Returns the creation date of the file, or an invalid date
         * if not available
         */
        virtual QDateTime creationDate() const = 0;

};

/**
 * @short An area of a specified page
 */
class OKULAR_EXPORT VisiblePageRect
{
    public:
        /**
         * Creates a new visible page rectangle.
         *
         * @param pageNumber The page number where the rectangle is located.
         * @param rectangle The rectangle in normalized coordinates.
         */
        explicit VisiblePageRect( int pageNumber = -1, const NormalizedRect &rectangle = NormalizedRect() );

        /**
         * The page number where the rectangle is located.
         */
        int pageNumber;

        /**
         * The rectangle in normalized coordinates.
         */
        NormalizedRect rect;
};

}

Q_DECLARE_METATYPE( Okular::DocumentInfo::Key )
Q_DECLARE_OPERATORS_FOR_FLAGS( Okular::Document::PixmapRequestFlags )

#endif

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