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KTextEditor

smartcursor.cpp

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00001 /* This file is part of the KDE project
00002    Copyright (C) 2003-2005 Hamish Rodda <rodda@kde.org>
00003 
00004    This library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Library General Public
00006    License version 2 as published by the Free Software Foundation.
00007 
00008    This library is distributed in the hope that it will be useful,
00009    but WITHOUT ANY WARRANTY; without even the implied warranty of
00010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00011    Library General Public License for more details.
00012 
00013    You should have received a copy of the GNU Library General Public License
00014    along with this library; see the file COPYING.LIB.  If not, write to
00015    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00016    Boston, MA 02110-1301, USA.
00017 */
00018 
00019 #include "smartcursor.h"
00020 
00021 #include "document.h"
00022 #include "smartrange.h"
00023 
00024 using namespace KTextEditor;
00025 
00026 SmartCursor::SmartCursor( const Cursor & position, Document * doc, InsertBehavior insertBehavior )
00027   : Cursor(position)
00028   , m_doc(doc)
00029   , m_moveOnInsert(insertBehavior == MoveOnInsert)
00030 {
00031   Q_ASSERT(m_doc);
00032 }
00033 
00034 SmartCursor::~ SmartCursor( )
00035 {
00036 }
00037 
00038 bool SmartCursor::isValid( ) const
00039 {
00040   return m_doc->cursorInText(*this);
00041 }
00042 
00043 bool SmartCursor::atEndOfDocument( ) const
00044 {
00045   return *this >= m_doc->documentEnd();
00046 }
00047 
00048 bool SmartCursor::isSmartCursor( ) const
00049 {
00050   return true;
00051 }
00052 
00053 bool SmartCursor::insertText( const QStringList & text, bool block )
00054 {
00055   return document()->insertText(*this, text, block);
00056 }
00057 
00058 QChar SmartCursor::character( ) const
00059 {
00060   return document()->character(*this);
00061 }
00062 
00063 SmartRange * SmartCursor::smartRange( ) const
00064 {
00065   return static_cast<SmartRange*>(m_range);
00066 }
00067 
00068 Document* SmartCursor::document() const
00069 {
00070   return m_doc;
00071 }
00072 
00073 bool SmartCursor::atEndOfLine( ) const
00074 {
00075   return column() == m_doc->lineLength(line());
00076 }
00077 
00078 SmartCursor::InsertBehavior SmartCursor::insertBehavior( ) const
00079 {
00080   return m_moveOnInsert ? MoveOnInsert : StayOnInsert;
00081 }
00082 
00083 void SmartCursor::setInsertBehavior( InsertBehavior insertBehavior )
00084 {
00085   m_moveOnInsert = insertBehavior == MoveOnInsert;
00086 }
00087 
00088 SmartCursor * SmartCursor::toSmartCursor( ) const
00089 {
00090   return const_cast<SmartCursor*>(this);
00091 }
00092 
00093 bool SmartCursor::advance(int distance, AdvanceMode mode)
00094 {
00095   Cursor c = *this;
00096   if (mode == ByCharacter) {
00097     while (distance) {
00098       int lineLength = document()->lineLength(c.line());
00099 
00100       if (distance > 0) {
00101         int advance = qMin(lineLength - c.column(), distance);
00102 
00103         if (distance > advance) {
00104           if (c.line() + 1 >= document()->lines())
00105             return false;
00106 
00107           c.setPosition(c.line() + 1, 0);
00108           // Account for end of line advancement
00109           distance -= advance + 1;
00110 
00111         } else {
00112           c.setColumn(c.column() + distance);
00113           distance = 0;
00114         }
00115 
00116       } else {
00117         int back = qMin(c.column(), -distance);
00118         if (-distance > back) {
00119           if (c.line() - 1 < 0)
00120             return false;
00121 
00122           c.setPosition(c.line() - 1, document()->lineLength(c.line() - 1));
00123           // Account for end of line advancement
00124           distance += back + 1;
00125 
00126         } else {
00127           c.setColumn(c.column() + distance);
00128           distance = 0;
00129         }
00130       }
00131     }
00132 
00133   } else {
00134     // Not supported by the interface alone
00135     return false;
00136   }
00137 
00138   setPosition(c);
00139   return true;
00140 }
00141 
00142 // kate: space-indent on; indent-width 2; replace-tabs on;

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