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Diffstat (limited to 'tdeutils/kreplace.h')
| -rw-r--r-- | tdeutils/kreplace.h | 269 |
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diff --git a/tdeutils/kreplace.h b/tdeutils/kreplace.h new file mode 100644 index 000000000..ea385189b --- /dev/null +++ b/tdeutils/kreplace.h @@ -0,0 +1,269 @@ +/* + Copyright (C) 2001, S.R.Haque <srhaque@iee.org>. + Copyright (C) 2002, David Faure <david@mandrakesoft.com> + This file is part of the KDE project + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public + License version 2, as published by the Free Software Foundation. + + 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. +*/ + +#ifndef KREPLACE_H +#define KREPLACE_H + +#include "kfind.h" + +class KReplaceNextDialog; + +/** + * @ingroup main + * @ingroup findreplace + * @brief A generic implementation of the "replace" function. + * + * @author S.R.Haque <srhaque@iee.org>, David Faure <faure@kde.org> + * + * \b Detail: + * + * This class includes prompt handling etc. Also provides some + * static functions which can be used to create custom behavior + * instead of using the class directly. + * + * \b Example: + * + * To use the class to implement a complete replace feature: + * + * In the slot connect to the replace action, after using KReplaceDialog: + * \code + * + * // This creates a replace-on-prompt dialog if needed. + * m_replace = new KReplace(pattern, replacement, options, this); + * + * // Connect signals to code which handles highlighting + * // of found text, and on-the-fly replacement. + * connect( m_replace, TQT_SIGNAL( highlight( const TQString &, int, int ) ), + * this, TQT_SLOT( slotHighlight( const TQString &, int, int ) ) ); + * // Connect findNext signal - called when pressing the button in the dialog + * connect( m_replace, TQT_SIGNAL( findNext() ), + * this, TQT_SLOT( slotReplaceNext() ) ); + * // Connect replace signal - called when doing a replacement + * connect( m_replace, TQT_SIGNAL( replace(const TQString &, int, int, int) ), + * this, TQT_SLOT( slotReplace(const TQString &, int, int, int) ) ); + * \endcode + * Then initialize the variables determining the "current position" + * (to the cursor, if the option FromCursor is set, + * to the beginning of the selection if the option SelectedText is set, + * and to the beginning of the document otherwise). + * Initialize the "end of search" variables as well (end of doc or end of selection). + * Swap begin and end if FindBackwards. + * Finally, call slotReplaceNext(); + * + * \code + * void slotReplaceNext() + * { + * KFind::Result res = KFind::NoMatch; + * while ( res == KFind::NoMatch && <position not at end> ) { + * if ( m_replace->needData() ) + * m_replace->setData( <current text fragment> ); + * + * // Let KReplace inspect the text fragment, and display a dialog if a match is found + * res = m_replace->replace(); + * + * if ( res == KFind::NoMatch ) { + * <Move to the next text fragment, honoring the FindBackwards setting for the direction> + * } + * } + * + * if ( res == KFind::NoMatch ) // i.e. at end + * <Call either m_replace->displayFinalDialog(); delete m_replace; m_replace = 0L; + * or if ( m_replace->shouldRestart() ) { reinit (w/o FromCursor) and call slotReplaceNext(); } + * else { m_replace->closeReplaceNextDialog(); }> + * } + * \endcode + * + * Don't forget delete m_find in the destructor of your class, + * unless you gave it a parent widget on construction. + * + */ +class KUTILS_EXPORT KReplace : + public KFind +{ + Q_OBJECT + +public: + + /** + * Only use this constructor if you don't use KFindDialog, or if + * you use it as a modal dialog. + * @param pattern The pattern to look for. + * @param replacement The replacement string. + * @param options Options for the find dialog. @see KFindDialog and KReplaceDialog. + * @param parent The parent widget. + */ + KReplace(const TQString &pattern, const TQString &replacement, long options, TQWidget *parent = 0); + /** + * This is the recommended constructor if you also use KReplaceDialog (non-modal). + * You should pass the pointer to it here, so that when a message box + * appears it has the right parent. Don't worry about deletion, KReplace + * will notice if the find dialog is closed. + * @param pattern The pattern to look for. + * @param replacement The replacement string. + * @param options Options for the find dialog. @see KFindDialog and KReplaceDialog. + * @param parent The parent widget. + * @param replaceDialog A pointer to the KReplaceDialog object. + */ + KReplace(const TQString &pattern, const TQString &replacement, long options, TQWidget *parent, TQWidget* replaceDialog); + + /** + * Destructor. + */ + virtual ~KReplace(); + + /** + * Return the number of replacements made (i.e. the number of times + * the replace signal was emitted). + * Can be used in a dialog box to tell the user how many replacements were made. + * The final dialog does so already, unless you used setDisplayFinalDialog(false). + * @return The number of replacements. + */ + int numReplacements() const { return m_replacements; } + + /** + * Call this to reset the numMatches & numReplacements counts. + * Can be useful if reusing the same KReplace for different operations, + * or when restarting from the beginning of the document. + */ + virtual void resetCounts(); + + /** + * Walk the text fragment (e.g. kwrite line, kspread cell) looking for matches. + * For each match, if prompt-on-replace is specified, emits the highlight() signal + * and displays the prompt-for-replace dialog before doing the replace. + * @return Whether or not there has been a match. + */ + Result replace(); + + /** + * Return (or create) the dialog that shows the "find next?" prompt. + * Usually you don't need to call this. + * One case where it can be useful, is when the user selects the "Find" + * menu item while a find operation is under way. In that case, the + * program may want to call setActiveWindow() on that dialog. + * @return The replace next dialog. + */ + KDialogBase* replaceNextDialog( bool create = false ); + + /** + * Close the "replace next?" dialog. The application should do this when + * the last match was hit. If the application deletes the KReplace, then + * "find previous" won't be possible anymore. + */ + void closeReplaceNextDialog(); + + /** + * Searches the given string, replaces with the given replacement string, + * and returns whether a match was found. If one is, + * the replacement string length is also returned. + * + * A performance optimised version of the function is provided for use + * with regular expressions. + * + * @param text The string to search. + * @param pattern The pattern to look for. + * @param replacement The replacement string to insert into the text. + * @param index The starting index into the string. + * @param options The options to use. + * @param replacedLength Output parameter, contains the length of the replaced string. + * Not always the same as replacement.length(), when backreferences are used. + * @return The index at which a match was found, or -1 if no match was found. + */ + static int replace( TQString &text, const TQString &pattern, const TQString &replacement, int index, long options, int *replacedLength ); + + /** + * Searches the given regular expression, replaces with the given replacement string, + * and returns whether a match was found. If one is, + * the replacement string length is also returned. + * + * Another version of the function is provided for use with strings. + * + * @param text The string to search. + * @param pattern The regular expression pattern to look for. + * @param replacement The replacement string to insert into the text. + * @param index The starting index into the string. + * @param options The options to use. + * @param replacedLength Output parameter, contains the length of the replaced string. + * Not always the same as replacement.length(), when backreferences are used. + * @return The index at which a match was found, or -1 if no match was found. + */ + static int replace( TQString &text, const TQRegExp &pattern, const TQString &replacement, int index, long options, int *replacedLength ); + + /** + * Returns @c true if we should restart the search from scratch. + * Can ask the user, or return @c false (if we already searched/replaced the + * whole document without the PromptOnReplace option). + * + * @param forceAsking set to @c true if the user modified the document during the + * search. In that case it makes sense to restart the search again. + * + * @param showNumMatches set to @c true if the dialog should show the number of + * matches. Set to @c false if the application provides a "find previous" action, + * in which case the match count will be erroneous when hitting the end, + * and we could even be hitting the beginning of the document (so not all + * matches have even been seen). + * + * @return @c true, if the search should be restarted. + */ + virtual bool shouldRestart( bool forceAsking = false, bool showNumMatches = true ) const; + + /** + * Displays the final dialog telling the user how many replacements were made. + * Call either this or shouldRestart(). + */ + virtual void displayFinalDialog() const; + +signals: + + /** + * Connect to this slot to implement updating of replaced text during the replace + * operation. + * + * Extra care must be taken to properly implement the "no prompt-on-replace" case. + * For instance highlight isn't emitted in that case (some code might rely on it), + * and for performance reasons one should repaint after replace() ONLY if + * prompt-on-replace was selected. + * + * @param text The text, in which the replacement has already been done. + * @param replacementIndex Starting index of the matched substring + * @param replacedLength Length of the replacement string + * @param matchedLength Length of the matched string + */ + void replace(const TQString &text, int replacementIndex, int replacedLength, int matchedLength); + +protected slots: + + void slotSkip(); + void slotReplace(); + void slotReplaceAll(); + +private: + KReplaceNextDialog* dialog(); + void doReplace(); + static int replace( TQString &text, const TQString &replacement, int index, long options, int length ); + + TQString m_replacement; + unsigned m_replacements; + + // Binary compatible extensibility. + class KReplacePrivate; + KReplacePrivate *d; +}; +#endif |