# kate Library API Documentation

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# kateundo.cpp

    00001 /* This file is part of the KDE libraries
    00002    Copyright (C) 2002 John Firebaugh <jfirebaugh@kde.org>
    00003    Copyright (C) 2001 Christoph Cullmann <cullmann@kde.org>
    00004    Copyright (C) 2001 Joseph Wenninger <jowenn@kde.org>
    00005
    00006    This library is free software; you can redistribute it and/or
    00007    modify it under the terms of the GNU Library General Public
    00008    License version 2 as published by the Free Software Foundation.
    00009
    00010    This library is distributed in the hope that it will be useful,
    00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00013    Library General Public License for more details.
    00014
    00015    You should have received a copy of the GNU Library General Public License
    00016    along with this library; see the file COPYING.LIB.  If not, write to
    00017    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00018    Boston, MA 02111-1307, USA.
    00019 */
    00020
    00021 #include "kateundo.h"
    00022
    00023 #include "katedocument.h"
    00024 #include "kateview.h"
    00025 #include "katecursor.h"
    00026
    00030  class KateUndo
    00031 {
    00032   public:
    00041     KateUndo (KateUndoGroup::UndoType type, uint line, uint col, uint len, const QString &text);
    00042
    00046     ~KateUndo ();
    00047
    00048   public:
    00055     bool isValid();
    00056
    00063     bool merge(KateUndo* u);
    00064
    00069     void undo (KateDocument *doc);
    00070
    00075     void redo (KateDocument *doc);
    00076
    00080     KateTextCursor cursorBefore() const;
    00081
    00085     KateTextCursor cursorAfter() const;
    00086
    00091     inline KateUndoGroup::UndoType type() const { return m_type; }
    00092
    00097     inline uint line () const { return m_line; }
    00098
    00103     inline uint col () const { return m_col; }
    00104
    00109     inline uint len() const { return m_len; }
    00110
    00115     inline const QString& text() const { return m_text; };
    00116
    00117   private:
    00121     KateUndoGroup::UndoType m_type;
    00122
    00126     uint m_line;
    00127
    00131     uint m_col;
    00132
    00136     uint m_len;
    00137
    00141     QString m_text;
    00142 };
    00143
    00144 KateUndo::KateUndo (KateUndoGroup::UndoType type, uint line, uint col, uint len, const QString &text)
    00145 : m_type (type),
    00146   m_line (line),
    00147   m_col (col),
    00148   m_len (len),
    00149   m_text (text)
    00150 {
    00151 }
    00152
    00153 KateUndo::~KateUndo ()
    00154 {
    00155 }
    00156
    00157 bool KateUndo::isValid()
    00158 {
    00159   if (m_type == KateUndoGroup::editInsertText || m_type == KateUndoGroup::editRemoveText)
    00160     if (len() == 0)
    00161       return false;
    00162
    00163   return true;
    00164 }
    00165
    00166 bool KateUndo::merge(KateUndo* u)
    00167 {
    00168   if (m_type != u->type())
    00169     return false;
    00170
    00171   if (m_type == KateUndoGroup::editInsertText
    00172       && m_line == u->line()
    00173       && (m_col + m_len) == u->col())
    00174   {
    00175     m_text += u->text();
    00176     m_len += u->len();
    00177     return true;
    00178   }
    00179   else if (m_type == KateUndoGroup::editRemoveText
    00180       && m_line == u->line()
    00181       && m_col == (u->col() + u->len()))
    00182   {
    00183     m_text.prepend(u->text());
    00184     m_col = u->col();
    00185     m_len += u->len();
    00186     return true;
    00187   }
    00188
    00189   return false;
    00190 }
    00191
    00192 void KateUndo::undo (KateDocument *doc)
    00193 {
    00194   if (m_type == KateUndoGroup::editInsertText)
    00195   {
    00196     doc->editRemoveText (m_line, m_col, m_len);
    00197   }
    00198   else if (m_type == KateUndoGroup::editRemoveText)
    00199   {
    00200     doc->editInsertText (m_line, m_col, m_text);
    00201   }
    00202   else if (m_type == KateUndoGroup::editWrapLine)
    00203   {
    00204     doc->editUnWrapLine (m_line, (m_text == "1"), m_len);
    00205   }
    00206   else if (m_type == KateUndoGroup::editUnWrapLine)
    00207   {
    00208     doc->editWrapLine (m_line, m_col, (m_text == "1"));
    00209   }
    00210   else if (m_type == KateUndoGroup::editInsertLine)
    00211   {
    00212     doc->editRemoveLine (m_line);
    00213   }
    00214   else if (m_type == KateUndoGroup::editRemoveLine)
    00215   {
    00216     doc->editInsertLine (m_line, m_text);
    00217   }
    00218   else if (m_type == KateUndoGroup::editMarkLineAutoWrapped)
    00219   {
    00220     doc->editMarkLineAutoWrapped (m_line, m_col == 0);
    00221   }
    00222 }
    00223
    00224 void KateUndo::redo (KateDocument *doc)
    00225 {
    00226   if (m_type == KateUndoGroup::editRemoveText)
    00227   {
    00228     doc->editRemoveText (m_line, m_col, m_len);
    00229   }
    00230   else if (m_type == KateUndoGroup::editInsertText)
    00231   {
    00232     doc->editInsertText (m_line, m_col, m_text);
    00233   }
    00234   else if (m_type == KateUndoGroup::editUnWrapLine)
    00235   {
    00236     doc->editUnWrapLine (m_line, (m_text == "1"), m_len);
    00237   }
    00238   else if (m_type == KateUndoGroup::editWrapLine)
    00239   {
    00240     doc->editWrapLine (m_line, m_col, (m_text == "1"));
    00241   }
    00242   else if (m_type == KateUndoGroup::editRemoveLine)
    00243   {
    00244     doc->editRemoveLine (m_line);
    00245   }
    00246   else if (m_type == KateUndoGroup::editInsertLine)
    00247   {
    00248     doc->editInsertLine (m_line, m_text);
    00249   }
    00250   else if (m_type == KateUndoGroup::editMarkLineAutoWrapped)
    00251   {
    00252     doc->editMarkLineAutoWrapped (m_line, m_col == 1);
    00253   }
    00254 }
    00255
    00256 KateTextCursor KateUndo::cursorBefore() const
    00257 {
    00258   if (m_type == KateUndoGroup::editInsertLine || m_type == KateUndoGroup::editUnWrapLine)
    00259     return KateTextCursor(m_line+1, m_col);
    00260   else if (m_type == KateUndoGroup::editRemoveText)
    00261     return KateTextCursor(m_line, m_col+m_len);
    00262
    00263   return KateTextCursor(m_line, m_col);
    00264 }
    00265
    00266 KateTextCursor KateUndo::cursorAfter() const
    00267 {
    00268   if (m_type == KateUndoGroup::editRemoveLine || m_type == KateUndoGroup::editWrapLine)
    00269     return KateTextCursor(m_line+1, m_col);
    00270   else if (m_type == KateUndoGroup::editInsertText)
    00271     return KateTextCursor(m_line, m_col+m_len);
    00272
    00273   return KateTextCursor(m_line, m_col);
    00274 }
    00275
    00276 KateUndoGroup::KateUndoGroup (KateDocument *doc)
    00277 : m_doc (doc),m_safePoint(false)
    00278 {
    00279   m_items.setAutoDelete (true);
    00280 }
    00281
    00282 KateUndoGroup::~KateUndoGroup ()
    00283 {
    00284 }
    00285
    00286 void KateUndoGroup::undo ()
    00287 {
    00288   if (m_items.count() == 0)
    00289     return;
    00290
    00291   m_doc->editStart (false);
    00292
    00293   for (KateUndo* u = m_items.last(); u; u = m_items.prev())
    00294     u->undo(m_doc);
    00295
    00296   if (m_doc->activeView())
    00297   {
    00298     for (uint z=0; z < m_items.count(); z++)
    00299       if (m_items.at(z)->type() != KateUndoGroup::editMarkLineAutoWrapped)
    00300       {
    00301         m_doc->activeView()->editSetCursor (m_items.at(z)->cursorBefore());
    00302         break;
    00303       }
    00304   }
    00305
    00306   m_doc->editEnd ();
    00307 }
    00308
    00309 void KateUndoGroup::redo ()
    00310 {
    00311   if (m_items.count() == 0)
    00312     return;
    00313
    00314   m_doc->editStart (false);
    00315
    00316   for (KateUndo* u = m_items.first(); u; u = m_items.next())
    00317     u->redo(m_doc);
    00318
    00319   if (m_doc->activeView())
    00320   {
    00321     for (uint z=0; z < m_items.count(); z++)
    00322       if (m_items.at(z)->type() != KateUndoGroup::editMarkLineAutoWrapped)
    00323       {
    00324         m_doc->activeView()->editSetCursor (m_items.at(z)->cursorAfter());
    00325         break;
    00326       }
    00327   }
    00328
    00329   m_doc->editEnd ();
    00330 }
    00331
    00332 void KateUndoGroup::addItem (KateUndoGroup::UndoType type, uint line, uint col, uint len, const QString &text)
    00333 {
    00334   addItem(new KateUndo(type, line, col, len, text));
    00335 }
    00336
    00337 void KateUndoGroup::addItem(KateUndo* u)
    00338 {
    00339   if (!u->isValid())
    00340     delete u;
    00341   else if (m_items.last() && m_items.last()->merge(u))
    00342     delete u;
    00343   else
    00344     m_items.append(u);
    00345 }
    00346
    00347 bool KateUndoGroup::merge(KateUndoGroup* newGroup,bool complex)
    00348 {
    00349   if (m_safePoint) return false;
    00350   if (newGroup->isOnlyType(singleType()) || complex) {
    00351     // Take all of its items first -> last
    00352     KateUndo* u = newGroup->m_items.take(0);
    00353     while (u) {
    00354       addItem(u);
    00355       u = newGroup->m_items.take(0);
    00356     }
    00357     if (newGroup->m_safePoint) safePoint();
    00358     return true;
    00359   }
    00360   return false;
    00361 }
    00362
    00363 void KateUndoGroup::safePoint (bool safePoint) {
    00364   m_safePoint=safePoint;
    00365 }
    00366
    00367 KateUndoGroup::UndoType KateUndoGroup::singleType()
    00368 {
    00369   KateUndoGroup::UndoType ret = editInvalid;
    00370
    00371   for (KateUndo* u = m_items.first(); u; u = m_items.next()) {
    00372     if (ret == editInvalid)
    00373       ret = u->type();
    00374     else if (ret != u->type())
    00375       return editInvalid;
    00376   }
    00377
    00378   return ret;
    00379 }
    00380
    00381 bool KateUndoGroup::isOnlyType(KateUndoGroup::UndoType type)
    00382 {
    00383   if (type == editInvalid) return false;
    00384
    00385   for (KateUndo* u = m_items.first(); u; u = m_items.next())
    00386     if (u->type() != type)
    00387       return false;
    00388
    00389   return true;
    00390 }
    00391
    00392 // kate: space-indent on; indent-width 2; replace-tabs on;

This file is part of the documentation for kate Library Version 3.4.1.
Documentation copyright © 1996-2004 the KDE developers.
Generated on Sat Jun 11 20:36:38 2005 by doxygen 1.4.1 written by Dimitri van Heesch, © 1997-2003