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428 lines
16 KiB
428 lines
16 KiB
/*
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Copyright (C) 2001, S.R.Haque <srhaque@iee.org>.
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Copyright (C) 2002, David Faure <david@mandrakesoft.com>
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This file is part of the KDE project
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License version 2, as published by the Free Software Foundation.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#ifndef KFIND_H
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#define KFIND_H
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#include <kdialogbase.h>
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#include <tqrect.h>
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/**
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* @ingroup main
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* @ingroup findreplace
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* @brief A generic implementation of the "find" function.
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*
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* @author S.R.Haque <srhaque@iee.org>, David Faure <faure@kde.org>,
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* Arend van Beelen jr. <arend@auton.nl>
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*
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* \b Detail:
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*
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* This class includes prompt handling etc. Also provides some
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* static functions which can be used to create custom behavior
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* instead of using the class directly.
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*
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* \b Example:
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*
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* To use the class to implement a complete find feature:
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*
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* In the slot connected to the find action, after using KFindDialog:
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* \code
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*
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* // This creates a find-next-prompt dialog if needed.
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* m_find = new KFind(pattern, options, this);
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*
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* // Connect highlight signal to code which handles highlighting
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* // of found text.
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* connect( m_find, TQT_SIGNAL( highlight( const TQString &, int, int ) ),
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* this, TQT_SLOT( slotHighlight( const TQString &, int, int ) ) );
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* // Connect findNext signal - called when pressing the button in the dialog
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* connect( m_find, TQT_SIGNAL( findNext() ),
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* this, TQT_SLOT( slotFindNext() ) );
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* \endcode
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*
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* If you are using a non-modal find dialog (the recommended new way
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* in KDE-3.2), you should call right away m_find->closeFindNextDialog().
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*
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* Then initialize the variables determining the "current position"
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* (to the cursor, if the option FromCursor is set,
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* to the beginning of the selection if the option SelectedText is set,
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* and to the beginning of the document otherwise).
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* Initialize the "end of search" variables as well (end of doc or end of selection).
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* Swap begin and end if FindBackwards.
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* Finally, call slotFindNext();
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*
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* \code
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* void slotFindNext()
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* {
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* KFind::Result res = KFind::NoMatch;
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* while ( res == KFind::NoMatch && <position not at end> ) {
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* if ( m_find->needData() )
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* m_find->setData( <current text fragment> );
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*
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* // Let KFind inspect the text fragment, and display a dialog if a match is found
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* res = m_find->find();
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*
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* if ( res == KFind::NoMatch ) {
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* <Move to the next text fragment, honoring the FindBackwards setting for the direction>
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* }
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* }
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*
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* if ( res == KFind::NoMatch ) // i.e. at end
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* <Call either m_find->displayFinalDialog(); delete m_find; m_find = 0L;
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* or if ( m_find->shouldRestart() ) { reinit (w/o FromCursor) and call slotFindNext(); }
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* else { m_find->closeFindNextDialog(); }>
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* }
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* \endcode
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*
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* Don't forget to delete m_find in the destructor of your class,
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* unless you gave it a parent widget on construction.
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*
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* This implementation allows to have a "Find Next" action, which resumes the
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* search, even if the user closed the "Find Next" dialog.
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*
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* A "Find Previous" action can simply switch temporarily the value of
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* FindBackwards and call slotFindNext() - and reset the value afterwards.
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*/
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class TDEUTILS_EXPORT KFind :
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public TQObject
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{
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Q_OBJECT
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public:
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/**
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* Only use this constructor if you don't use KFindDialog, or if
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* you use it as a modal dialog.
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* @param pattern The pattern to look for.
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* @param options Options for the find dialog. @see KFindDialog.
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* @param parent The parent widget.
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*/
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KFind(const TQString &pattern, long options, TQWidget *parent);
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/**
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* This is the recommended constructor if you also use KFindDialog (non-modal).
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* You should pass the pointer to it here, so that when a message box
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* appears it has the right parent. Don't worry about deletion, KFind
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* will notice if the find dialog is closed.
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* @param pattern The pattern to look for.
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* @param options Options for the find dialog. @see KFindDialog.
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* @param parent The parent widget.
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* @param findDialog A pointer to the KFindDialog object.
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*/
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KFind(const TQString &pattern, long options, TQWidget *parent, TQWidget* findDialog);
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/**
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* Destructor.
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*/
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virtual ~KFind();
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/**
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* Result enum. Holds information if the find was successful.
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*/
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enum Result {
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NoMatch, ///< No match was found.
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Match ///< A match was found.
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};
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/**
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* @return @c true if the application must supply a new text fragment
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* It also means the last call returned "NoMatch". But by storing this here
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* the application doesn't have to store it in a member variable (between
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* calls to slotFindNext()).
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*/
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bool needData() const;
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/**
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* Call this when needData returns @c true, before calling find().
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* @param data the text fragment (line)
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* @param startPos if set, the index at which the search should start.
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* This is only necessary for the very first call to setData usually,
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* for the 'find in selection' feature. A value of -1 (the default value)
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* means "process all the data", i.e. either 0 or data.length()-1 depending
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* on FindBackwards.
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*/
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void setData( const TQString& data, int startPos = -1 );
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/**
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* Call this when needData returns @c true, before calling find(). The use of
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* ID's is especially useful if you're using the FindIncremental option.
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* @param id the id of the text fragment
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* @param data the text fragment (line)
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* @param startPos if set, the index at which the search should start.
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* This is only necessary for the very first call to setData usually,
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* for the 'find in selection' feature. A value of -1 (the default value)
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* means "process all the data", i.e. either 0 or data.length()-1 depending
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* on FindBackwards.
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*
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* @since 3.3
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*/
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void setData( int id, const TQString& data, int startPos = -1 );
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/**
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* Walk the text fragment (e.g. text-processor line, kspread cell) looking for matches.
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* For each match, emits the highlight() signal and displays the find-again dialog
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* proceeding.
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* @return Whether or not there has been a match.
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*/
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Result find();
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/**
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* Return the current options.
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*
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* Warning: this is usually the same value as the one passed to the constructor,
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* but options might change _during_ the replace operation:
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* e.g. the "All" button resets the PromptOnReplace flag.
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*
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* @return The current options. @see KFindDialog.
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*/
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long options() const { return m_options; }
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/**
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* Set new options. Usually this is used for setting or clearing the
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* FindBackwards options.
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*
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* @see KFindDialog.
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*/
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virtual void setOptions( long options );
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/**
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* @return the pattern we're currently looking for
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*/
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TQString pattern() const { return m_pattern; }
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/**
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* Change the pattern we're looking for
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* @param pattern The new pattern.
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*/
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void setPattern( const TQString& pattern );
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/**
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* Return the number of matches found (i.e. the number of times
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* the highlight signal was emitted).
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* If 0, can be used in a dialog box to tell the user "no match was found".
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* The final dialog does so already, unless you used setDisplayFinalDialog(false).
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* @return The number of matches.
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*/
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int numMatches() const { return m_matches; }
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/**
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* Call this to reset the numMatches count
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* (and the numReplacements count for a KReplace).
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* Can be useful if reusing the same KReplace for different operations,
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* or when restarting from the beginning of the document.
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*/
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virtual void resetCounts() { m_matches = 0; }
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/**
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* Virtual method, which allows applications to add extra checks for
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* validating a candidate match. It's only necessary to reimplement this
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* if the find dialog extension has been used to provide additional
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* criterias.
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*
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* @param text The current text fragment
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* @param index The starting index where the candidate match was found
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* @param matchedlength The length of the candidate match
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*/
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virtual bool validateMatch( const TQString & text, int index, int matchedlength ) {
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Q_UNUSED(text); Q_UNUSED(index); Q_UNUSED(matchedlength); return true; }
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/**
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* Returns @c true if we should restart the search from scratch.
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* Can ask the user, or return @c false (if we already searched the whole document).
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*
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* @param forceAsking set to @c true if the user modified the document during the
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* search. In that case it makes sense to restart the search again.
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*
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* @param showNumMatches set to @c true if the dialog should show the number of
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* matches. Set to @c false if the application provides a "find previous" action,
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* in which case the match count will be erroneous when hitting the end,
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* and we could even be hitting the beginning of the document (so not all
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* matches have even been seen).
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*
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* @return @c true, if the search should be restarted.
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*/
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virtual bool shouldRestart( bool forceAsking = false, bool showNumMatches = true ) const;
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/**
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* Search the given string, and returns whether a match was found. If one is,
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* the length of the string matched is also returned.
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*
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* A performance optimised version of the function is provided for use
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* with regular expressions.
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*
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* @param text The string to search.
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* @param pattern The pattern to look for.
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* @param index The starting index into the string.
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* @param options The options to use.
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* @param matchedlength The length of the string that was matched
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* @return The index at which a match was found, or -1 if no match was found.
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*/
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static int find( const TQString &text, const TQString &pattern, int index, long options, int *matchedlength );
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/**
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* Search the given regular expression, and returns whether a match was found. If one is,
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* the length of the matched string is also returned.
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*
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* Another version of the function is provided for use with strings.
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*
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* @param text The string to search.
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* @param pattern The regular expression pattern to look for.
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* @param index The starting index into the string.
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* @param options The options to use.
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* @param matchedlength The length of the string that was matched
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* @return The index at which a match was found, or -1 if no match was found.
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*/
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static int find( const TQString &text, const TQRegExp &pattern, int index, long options, int *matchedlength );
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/**
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* Displays the final dialog saying "no match was found", if that was the case.
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* Call either this or shouldRestart().
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*/
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virtual void displayFinalDialog() const;
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/**
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* Return (or create) the dialog that shows the "find next?" prompt.
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* Usually you don't need to call this.
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* One case where it can be useful, is when the user selects the "Find"
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* menu item while a find operation is under way. In that case, the
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* program may want to call setActiveWindow() on that dialog.
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* @return The find next dialog.
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*/
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KDialogBase* findNextDialog( bool create = false );
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/**
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* Close the "find next?" dialog. The application should do this when
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* the last match was hit. If the application deletes the KFind, then
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* "find previous" won't be possible anymore.
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*
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* IMPORTANT: you should also call this if you are using a non-modal
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* find dialog, to tell KFind not to pop up its own dialog.
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*/
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void closeFindNextDialog();
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/**
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* @return the current matching index ( or -1 ).
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* Same as the matchingIndex parameter passed to highlight.
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* You usually don't need to use this, except maybe when updating the current data,
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* so you need to call setData( newData, index() ).
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* @since 3.2
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*/
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int index() const;
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signals:
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/**
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* Connect to this signal to implement highlighting of found text during the find
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* operation.
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*
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* If you've set data with setData(id, text), use the signal highlight(id,
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* matchingIndex, matchedLength)
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*
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* @warning If you're using the FindIncremental option, the text argument
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* passed by this signal is not necessarily the data last set through
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* setData(), but can also be an earlier set data block.
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*
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* @param text The found text.
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* @param matchingIndex The index of the found text's occurrence.
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* @param matchedLength The length of the matched text.
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* @see setData()
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*/
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void highlight(const TQString &text, int matchingIndex, int matchedLength);
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/**
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* Connect to this signal to implement highlighting of found text during the find
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* operation.
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*
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* Use this signal if you've set your data with setData(id, text), otherwise
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* use the signal with highlight(text, matchingIndex, matchedLength).
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*
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* @warning If you're using the FindIncremental option, the id argument
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* passed by this signal is not necessarily the id of the data last set
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* through setData(), but can also be of an earlier set data block.
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*
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* @param id The ID of the text fragment, as used in setData().
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* @param matchingIndex The index of the found text's occurrence.
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* @param matchedLength The length of the matched text.
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* @see setData()
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*
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* @since 3.3
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*/
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void highlight(int id, int matchingIndex, int matchedLength);
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// ## TODO docu
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// findprevious will also emit findNext, after temporarily switching the value
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// of FindBackwards
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void findNext();
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/**
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* Emitted when the options have changed.
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* This can happen e.g. with "Replace All", or if our 'find next' dialog
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* gets a "find previous" one day.
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*/
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void optionsChanged();
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/**
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* Emitted when the 'find next' dialog is being closed.
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* Some apps might want to remove the highlighted text when this happens.
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* Apps without support for "Find Next" can also do m_find->deleteLater()
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* to terminate the find operation.
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*/
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void dialogClosed();
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protected:
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TQWidget* parentWidget() const { return (TQWidget *)parent(); }
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TQWidget* dialogsParent() const;
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protected slots:
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void slotFindNext();
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void slotDialogClosed();
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private:
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void init( const TQString& pattern );
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void startNewIncrementalSearch();
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static bool isInWord( TQChar ch );
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static bool isWholeWords( const TQString &text, int starts, int matchedLength );
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friend class KReplace;
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TQString m_pattern;
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TQRegExp *m_regExp;
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KDialogBase* m_dialog;
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long m_options;
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unsigned m_matches;
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TQString m_text; // the text set by setData
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int m_index;
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int m_matchedLength;
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bool m_dialogClosed;
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bool m_lastResult;
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// Binary compatible extensibility.
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struct Private;
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Private *d;
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};
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#endif
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