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     2 **

     3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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     6 **

     7 ** This file is part of the QtDeclarative module of the Qt Toolkit.

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     9 ** $QT_BEGIN_LICENSE:LGPL$

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    16 ** GNU Lesser General Public License Usage

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 #include "private/textwriter_p.h"

    43 

    44 QT_QML_BEGIN_NAMESPACE

    45 

    46 using namespace QDeclarativeJS;

    47 

    48 TextWriter::TextWriter()

    49         :string(0), cursor(0)

    50 {

    51 }

    52 

    53 static bool overlaps(int posA, int lengthA, int posB, int lengthB) {

    54     return (posA < posB + lengthB && posA + lengthA > posB + lengthB)

    55             || (posA < posB && posA + lengthA > posB);

    56 }

    57 

    58 bool TextWriter::hasOverlap(int pos, int length)

    59 {

    60     {

    61         QListIterator<Replace> i(replaceList);

    62         while (i.hasNext()) {

    63             const Replace &cmd = i.next();

    64             if (overlaps(pos, length, cmd.pos, cmd.length))

    65                 return true;

    66         }

    67     }

    68     {

    69         QListIterator<Move> i(moveList);

    70         while (i.hasNext()) {

    71             const Move &cmd = i.next();

    72             if (overlaps(pos, length, cmd.pos, cmd.length))

    73                 return true;

    74         }

    75         return false;

    76     }

    77 }

    78 

    79 bool TextWriter::hasMoveInto(int pos, int length)

    80 {

    81     QListIterator<Move> i(moveList);

    82     while (i.hasNext()) {

    83         const Move &cmd = i.next();

    84         if (cmd.to >= pos && cmd.to < pos + length)

    85             return true;

    86     }

    87     return false;

    88 }

    89 

    90 void TextWriter::replace(int pos, int length, const QString &replacement)

    91 {

    92     Q_ASSERT(!hasOverlap(pos, length));

    93     Q_ASSERT(!hasMoveInto(pos, length));

    94 

    95     Replace cmd;

    96     cmd.pos = pos;

    97     cmd.length = length;

    98     cmd.replacement = replacement;

    99     replaceList += cmd;

   100 }

   101 

   102 void TextWriter::move(int pos, int length, int to)

   103 {

   104     Q_ASSERT(!hasOverlap(pos, length));

   105 

   106     Move cmd;

   107     cmd.pos = pos;

   108     cmd.length = length;

   109     cmd.to = to;

   110     moveList += cmd;

   111 }

   112 

   113 void TextWriter::doReplace(const Replace &replace)

   114 {

   115     int diff = replace.replacement.size() - replace.length;

   116     {

   117         QMutableListIterator<Replace> i(replaceList);

   118         while (i.hasNext()) {

   119             Replace &c = i.next();

   120             if (replace.pos < c.pos)

   121                 c.pos += diff;

   122             else if (replace.pos + replace.length < c.pos + c.length)

   123                 c.length += diff;

   124         }

   125     }

   126     {

   127         QMutableListIterator<Move> i(moveList);

   128         while (i.hasNext()) {

   129             Move &c = i.next();

   130             if (replace.pos < c.pos)

   131                 c.pos += diff;

   132             else if (replace.pos + replace.length < c.pos + c.length)

   133                 c.length += diff;

   134 

   135             if (replace.pos < c.to)

   136                 c.to += diff;

   137         }

   138     }

   139 

   140     if (string) {

   141         string->replace(replace.pos, replace.length, replace.replacement);

   142     } else if (cursor) {

   143         cursor->setPosition(replace.pos);

   144         cursor->setPosition(replace.pos + replace.length, QTextCursor::KeepAnchor);

   145         cursor->insertText(replace.replacement);

   146     }

   147 }

   148 

   149 void TextWriter::doMove(const Move &move)

   150 {

   151     QString text;

   152     if (string) {

   153         text = string->mid(move.pos, move.length);

   154     } else if (cursor) {

   155         cursor->setPosition(move.pos);

   156         cursor->setPosition(move.pos + move.length, QTextCursor::KeepAnchor);

   157         text = cursor->selectedText();

   158     }

   159 

   160     Replace cut;

   161     cut.pos = move.pos;

   162     cut.length = move.length;

   163     Replace paste;

   164     paste.pos = move.to;

   165     paste.length = 0;

   166     paste.replacement = text;

   167 

   168     replaceList.append(cut);

   169     replaceList.append(paste);

   170 

   171     Replace cmd;

   172     while (!replaceList.isEmpty()) {

   173         cmd = replaceList.first();

   174         replaceList.removeFirst();

   175         doReplace(cmd);

   176     }

   177 }

   178 

   179 void TextWriter::write(QString *s)

   180 {

   181     string = s;

   182     write_helper();

   183     string = 0;

   184 }

   185 

   186 void TextWriter::write(QTextCursor *textCursor)

   187 {

   188     cursor = textCursor;

   189     write_helper();

   190     cursor = 0;

   191 }

   192 

   193 void TextWriter::write_helper()

   194 {

   195     if (cursor)

   196         cursor->beginEditBlock();

   197     {

   198         Replace cmd;

   199         while (!replaceList.isEmpty()) {

   200             cmd = replaceList.first();

   201             replaceList.removeFirst();

   202             doReplace(cmd);

   203         }

   204     }

   205     {

   206         Move cmd;

   207         while (!moveList.isEmpty()) {

   208             cmd = moveList.first();

   209             moveList.removeFirst();

   210             doMove(cmd);

   211         }

   212     }

   213     if (cursor)

   214         cursor->endEditBlock();

   215 }

   216 

   217 QT_QML_END_NAMESPACE