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| -rw-r--r-- | sd/inc/OutlinerIterator.hxx | 317 |
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diff --git a/sd/inc/OutlinerIterator.hxx b/sd/inc/OutlinerIterator.hxx new file mode 100644 index 000000000..84ab71207 --- /dev/null +++ b/sd/inc/OutlinerIterator.hxx @@ -0,0 +1,317 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#ifndef INCLUDED_SD_INC_OUTLINERITERATOR_HXX +#define INCLUDED_SD_INC_OUTLINERITERATOR_HXX + +#include <svx/svdobj.hxx> + +#include "pres.hxx" +#include <sal/types.h> +#include <memory> +#include <vector> + +class SdDrawDocument; +class SdOutliner; + +namespace sd { + +class ViewShell; + +namespace outliner { + +class IteratorImplBase; +class IteratorPosition; + +/** Use this enum to specify the initial location of the object pointed to by + a newly created iterator. The values are + <ul><li><const>BEGIN</const> for the first object with reference to + iteration direction.</li> + <li>END for one past the last valid object or, if the iterator is a + backward iterator, the object in front of the first valid one.</li> + <li>CURRENT for the current object. Because there is only a current + page this usually is taken to be the first/last object on the current + page.</li></ul> +*/ +enum IteratorLocation {BEGIN,END,CURRENT}; + +/** This iterator can be used to iterate over all <type>SdrObject</type> + objects of one of three set denoted by the <type>IteratorType</type>: + <ul><li>All objects of the current mark list (selection) + (type==SELECTION).</li> + <li>All objects in the current view (type==SINGLE_VIEW).</li> + <li>All objects in all views (type=DOCUMENT).</li></ul> + + <p>Note that the iterator does not change pages or views. It is the + task of the user of the iterator to take the information provided by the + <type>IteratorPosition</type> as returned by the + <member>operator*()</member> method and set view, visible page, and + selection/edit mode markers to reflect this position.</p> + + <p>A simple forward iteration from the first to the last object would + instantiate the iterator with + <code>Iterator(pDocument,pViewShell,true,BEGIN)</code> for some document + and view shell. This iterator can then be compared against + <code>Iterator(pDocument,pViewShell,true,END)</code>. On equality the + iteration should be stopped without evaluating the iterator: The position + of an end iterator is not valid.</p> +*/ +class Iterator +{ +public: + Iterator(); + + /** The copy constructor creates a new iterator by copying the + implementation object. + */ + Iterator (const Iterator& rIterator); + Iterator(Iterator&& rIterator) noexcept; + + /** Create a new iterator with the implementation object being the + provided one. + @param pObject + A copy of this object will become the implementation object. + */ + explicit Iterator (std::unique_ptr<IteratorImplBase> pObject); + + ~Iterator(); + + /** Assign the iterator from the given one. The implementation object + of this iterator will be a copy of the given iterator. + @param rIterator + The iterator which to assign from. + */ + Iterator& operator= (const Iterator& rIterator); + Iterator& operator=(Iterator&& rIterator) noexcept; + + /** Return the current position of the iterator. + @return + Returns a reference to the current position. Therefore this + method is not thread safe. The reason for this behaviour is, of + course, to omit the copying of the returned position. + */ + const IteratorPosition& operator* () const; + /** The prefix increment operator returns the iterator pointing to the + next object. When in doubt prefer this operator over the postfix + increment operator. + @return + Returns a reference to this iterator pointing to the next object. + */ + Iterator& operator++ (); + /** Test equality of two iterators. Two iterators are taken to be equal + when they point are of the same type (their implementation objects + are instances of the same class) and point to the same object. + @param rIterator + The iterator to test equality with. + @return + Returns <TRUE/> when both iterators point to the same object. + */ + bool operator== (const Iterator& rIterator) const; + /** Test whether two iterators point to different objects. This is just + the negation of the result of the equality operator. + @param rIterator + The iterator to test inequality with. + @return + Returns <TRUE/> when both iterators point to the different objects. + */ + bool operator!= (const Iterator& rIterator) const; + /** Reverse the direction of iteration. The position of the iterator is + not changed. Thus calling this method twice returns to the old state. + */ + void Reverse(); + +private: + /// The implementation object to which most of the methods are forwarded. + std::unique_ptr<IteratorImplBase> mxIterator; +}; + +/** This class wraps the <type>SdOutliner</type> class and represents it as + a container of <type>SdrObject</type> objects. Its main purpose is to + provide iterators for certain sub-sets of those objects. These sub-sets + are a) the set of the currently selected objects, b) all objects in the + current view, and c) all objects in all views. + + <p>The direction of the returned iterators depends on the underlying + <type>SdOutliner</type> object and is usually set in the search + dialog.</p> +*/ +class OutlinerContainer +{ +public: + /** Create a new wrapper object for the given outliner. + @param pOutliner + The outliner that is represented by the new object as + <type>SdrObject</type> container. + */ + OutlinerContainer (SdOutliner* pOutliner); + + /** Return an iterator that points to the first object of one of the + sets described above. This takes also into account the direction of + iteration. + @return + The returned iterator points either to the first (forward + search) or to the last object (backward search) of the set. + */ + Iterator begin(); + + /** Return an iterator that marks the end of the iteration. This takes + also into account the direction of iteration. The object pointed to + is not valid. + @return + The returned iterator points either to that object past the last + one (forward search) or to the one in front of the first + (backward search). + */ + Iterator end(); + + /** Return an iterator that points to the current object of one of the + sets described above. This takes also into account the direction of + iteration. + @return + The returned iterator points either to the first (forward + search) or to the last object (backward search) of the set of + selected objects or of the current page if the search set spans + more than one page. + */ + Iterator current(); + +private: + /// The wrapped outliner that is represented as object container. + SdOutliner* mpOutliner; + + /** Create an iterator. The object pointed to depends on the search + direction retrieved from the outliner object + <member>mpOutliner</member> and the given location. + @param aLocation + This specifies whether the returned iterator points to the + first, (one past the) last, or current object. + @return + Returns an iterator as constructed by + <member>CreateSelectionIterator()</member>, + */ + Iterator CreateIterator (IteratorLocation aLocation); + + /** Create an iterator that iterates over all currently selected + <type>SdrObjects</type> objects of the <member>mpOutliner</member> + outliner. + @param rObjectList + List of currently selected objects. This list is necessary + so that the selection can be changed without affecting the + iterator. + @param pDocument + The document to which the objects belong. + @param pViewShell + The view shell which displays the objects. + @param bDirectionIsForward + The direction of iteration. It defaults to forward. + @param aLocation + This specifies at which object the iterator points initially. + */ + static Iterator CreateSelectionIterator ( + const ::std::vector<::tools::WeakReference<SdrObject>>& rObjectList, + SdDrawDocument* pDocument, + const std::shared_ptr<ViewShell>& rpViewShell, + bool bDirectionIsForward, + IteratorLocation aLocation); + + /** Create an iterator that iterates over all <type>SdrObjects</type> + objects of the <member>mpOutliner</member> outliner. + @param pDocument + The document to which the objects belong. + @param pViewShell + The view shell which displays the objects. + @param bDirectionIsForward + The direction of iteration. It defaults to forward. + @param aLocation + This specifies at which object the iterator points initially. + */ + static Iterator CreateDocumentIterator ( + SdDrawDocument* pDocument, + const std::shared_ptr<ViewShell>& rpViewShell, + bool bDirectionIsForward, + IteratorLocation aLocation); + + /** Return the index of a page that contains an object that a new + iterator shall point to. This page index depends primarily on the + location, iteration direction, as well as on edit mode and page + kind. + @param pDocument + The document to which the page belongs. + @param pViewShell + The view shell which displays the page. + @param ePageKind + Specifies the view the page belongs to. + @param eEditMode + Specifies whether the page is a master page. + @param bDirectionIsForward + The direction of iteration. + @param aLocation + This specifies at which object the iterator points initially. + */ + static sal_Int32 GetPageIndex ( + SdDrawDocument const * pDocument, + const std::shared_ptr<ViewShell>& rpViewShell, + PageKind ePageKind, + EditMode eEditMode, + bool bDirectionIsForward, + IteratorLocation aLocation); + + // Do not allow default constructor and copying of outliner containers. + OutlinerContainer (const OutlinerContainer&) = delete; + OutlinerContainer& operator= (const OutlinerContainer&) = delete; +}; + +/** Data collection specifying a <type>SdrObject</type> and its position in + a document and view. +*/ +class IteratorPosition +{ +public: + /** Create a new object with all data members set to default values. + These values should not be accessed. The only use of the object as + it is as a marker in comparisons. + */ + IteratorPosition(); + + /** Compare two positions for equality. + @return + <TRUE/> is returned only when all data members have the same + values in both position objects. + */ + bool operator== (const IteratorPosition& aPosition) const; + + /// Pointer to the actual <type>SdrObject</type> object. + ::tools::WeakReference<SdrObject> mxObject; + + /// Number of the actual SdrText from the current <type>SdrObject</type> + sal_Int32 mnText; + + /// The index of a page where the object is located on. + sal_Int32 mnPageIndex; + /// Page kind of the view. + PageKind mePageKind; + /// Edit mode of the view. + EditMode meEditMode; +}; + +} } // end of namespace ::sd::outliner + +#endif // _ INCLUDED_SD_INC_OUTLINERITERATOR_HXX + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |