mirror of
https://invent.kde.org/graphics/okular
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125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
/*
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SPDX-FileCopyrightText: 2005 Enrico Ros <eros.kde@email.it>
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SPDX-FileCopyrightText: 2005 Albert Astals Cid <aacid@kde.org>
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Work sponsored by the LiMux project of the city of Munich:
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SPDX-FileCopyrightText: 2017 Klarälvdalens Datakonsult AB a KDAB Group company <info@kdab.com>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef _OKULAR_DOCUMENTOBSERVER_H_
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#define _OKULAR_DOCUMENTOBSERVER_H_
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#include <QVector>
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#include "okularcore_export.h"
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namespace Okular
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{
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class Page;
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/**
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* @short Base class for objects being notified when something changes.
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*
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* Inherit this class and call Document->addObserver( yourClass ) to get
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* notified of asynchronous events (new pixmap generated, or changed, etc..).
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*/
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class OKULARCORE_EXPORT DocumentObserver
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{
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public:
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DocumentObserver();
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/**
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* Destroys the document observer.
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*/
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virtual ~DocumentObserver();
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DocumentObserver(const DocumentObserver &) = delete;
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DocumentObserver &operator=(const DocumentObserver &) = delete;
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/**
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* Flags that can be sent from the document to all observers to
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* inform them about the type of object that has been changed.
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*/
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enum ChangedFlags {
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Pixmap = 1, ///< Pixmaps has been changed
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Bookmark = 2, ///< Bookmarks has been changed
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Highlights = 4, ///< Highlighting information has been changed
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TextSelection = 8, ///< Text selection has been changed
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Annotations = 16, ///< Annotations have been changed
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BoundingBox = 32, ///< Bounding boxes have been changed
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NeedSaveAs = 64 ///< Set when "Save" is needed or annotation/form changes will be lost @since 0.15 (KDE 4.9) @deprecated
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};
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/**
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* ...
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*/
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enum SetupFlags {
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DocumentChanged = 1, ///< The document is a new document.
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NewLayoutForPages = 2, ///< All the pages have
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UrlChanged = 4 ///< The URL has changed @since 1.3
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};
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/**
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* This method is called whenever the document is initialized or reconstructed.
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*
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* @param pages The vector of pages of the document.
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* @param setupFlags the flags with the information about the setup
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*/
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virtual void notifySetup(const QVector<Okular::Page *> &pages, int setupFlags);
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/**
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* This method is called whenever the viewport has been changed.
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*
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* @param smoothMove If true, the move shall be animated.
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*/
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virtual void notifyViewportChanged(bool smoothMove);
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/**
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* This method is called whenever the content on @p page described by the
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* passed @p flags has been changed.
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*/
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virtual void notifyPageChanged(int page, int flags);
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/**
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* This method is called whenever the content described by the passed @p flags
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* has been cleared.
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*/
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virtual void notifyContentsCleared(int flags);
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/**
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* This method is called whenever the visible rects have been changed.
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*/
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virtual void notifyVisibleRectsChanged();
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/**
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* This method is called whenever the zoom of the document has been changed.
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*/
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virtual void notifyZoom(int factor);
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/**
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* Returns whether the observer agrees that all pixmaps for the given
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* @p page can be unloaded to improve memory usage.
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*
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* Returns true per default.
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*/
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virtual bool canUnloadPixmap(int page) const;
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/**
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* This method is called after the current page of the document has been entered.
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*
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* @param previous The number of the previous page (is @c -1 for the initial page change).
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* @param current The number of the current page.
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*
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* @since 0.16 (KDE 4.10)
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*/
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virtual void notifyCurrentPageChanged(int previous, int current);
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private:
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class Private;
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const Private *d;
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};
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}
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#endif
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