src/qtui/chatlinemodelitem.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-08 by the Quassel Project                          *
   3  *   devel@quassel-irc.org                                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) version 3.                                           *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
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  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
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  20
  21 #include <QFontMetrics>
  22 #include <QTextBoundaryFinder>
  23
  24 #include "chatlinemodelitem.h"
  25 #include "chatlinemodel.h"
  26 #include "qtui.h"
  27 #include "qtuistyle.h"
  28
  29 // This Struct is taken from Harfbuzz. We use it only to calc it's size.
  30 // we use a shared memory region so we do not have to malloc a buffer area for every line
  31 typedef struct {
  32     /*HB_LineBreakType*/ unsigned lineBreakType  :2;
  33     /*HB_Bool*/ unsigned whiteSpace              :1;     /* A unicode whitespace character, except NBSP, ZWNBSP */
  34     /*HB_Bool*/ unsigned charStop                :1;     /* Valid cursor position (for left/right arrow) */
  35     /*HB_Bool*/ unsigned wordBoundary            :1;
  36     /*HB_Bool*/ unsigned sentenceBoundary        :1;
  37     unsigned unused                  :2;
  38 } HB_CharAttributes_Dummy;
  39
  40 // PRIVATE DATA FOR CHATLINE MODEL ITEM
  41 class ChatLineModelItemPrivate {
  42
  43 public:
  44   inline ChatLineModelItemPrivate(const Message &msg);
  45   ~ChatLineModelItemPrivate();
  46
  47   inline bool needsStyling();
  48   QVariant data(MessageModel::ColumnType column, int role);
  49
  50 private:
  51   void style();
  52   void computeWrapList();
  53
  54   ChatLineModel::WrapList _wrapList;
  55   Message *_msgBuffer;
  56   UiStyle::StyledMessage *_styledMsg;
  57
  58   static unsigned char *TextBoundaryFinderBuffer;
  59   static int TextBoundaryFinderBufferSize;
  60 };
  61
  62 ChatLineModelItemPrivate::ChatLineModelItemPrivate(const Message &msg)
  63 : _msgBuffer(new Message(msg)),
  64   _styledMsg(0) {
  65
  66 }
  67
  68 ChatLineModelItemPrivate::~ChatLineModelItemPrivate() {
  69   if(_msgBuffer) {
  70     delete _msgBuffer;
  71   } else {
  72     delete _styledMsg;
  73   }
  74 }
  75
  76 bool ChatLineModelItemPrivate::needsStyling() {
  77   return (bool)_msgBuffer;
  78 }
  79
  80 QVariant ChatLineModelItemPrivate::data(MessageModel::ColumnType column, int role) {
  81   if(needsStyling())
  82     style();
  83   switch(column) {
  84     case ChatLineModel::TimestampColumn:
  85       switch(role) {
  86         case ChatLineModel::DisplayRole:
  87           return _styledMsg->decoratedTimestamp();
  88         case ChatLineModel::EditRole:
  89           return _styledMsg->timestamp();
  90         case ChatLineModel::FormatRole:
  91           return QVariant::fromValue<UiStyle::FormatList>(UiStyle::FormatList()
  92                                     << qMakePair((quint16)0, (quint32)_styledMsg->timestampFormat()));
  93       }
  94       break;
  95     case ChatLineModel::SenderColumn:
  96       switch(role) {
  97         case ChatLineModel::DisplayRole:
  98           return _styledMsg->decoratedSender();
  99         case ChatLineModel::EditRole:
 100           return _styledMsg->sender();
 101         case ChatLineModel::FormatRole:
 102           return QVariant::fromValue<UiStyle::FormatList>(UiStyle::FormatList()
 103                                     << qMakePair((quint16)0, (quint32)_styledMsg->senderFormat()));
 104       }
 105       break;
 106     case ChatLineModel::ContentsColumn:
 107       switch(role) {
 108         case ChatLineModel::DisplayRole:
 109         case ChatLineModel::EditRole:
 110           return _styledMsg->contents();
 111         case ChatLineModel::FormatRole:
 112           return QVariant::fromValue<UiStyle::FormatList>(_styledMsg->contentsFormatList());
 113         case ChatLineModel::WrapListRole:
 114           if(_wrapList.isEmpty())
 115             computeWrapList();
 116           return QVariant::fromValue<ChatLineModel::WrapList>(_wrapList);
 117       }
 118       break;
 119     default:
 120       Q_ASSERT(false);
 121       return 0;
 122   }
 123   return QVariant();
 124 }
 125
 126 void ChatLineModelItemPrivate::style() {
 127   _styledMsg = new QtUiStyle::StyledMessage(QtUi::style()->styleMessage(*_msgBuffer));
 128   delete _msgBuffer;
 129   _msgBuffer = 0;
 130 }
 131
 132 void ChatLineModelItemPrivate::computeWrapList() {
 133   int length = _styledMsg->contents().length();
 134   if(!length)
 135     return;
 136
 137   enum Mode { SearchStart, SearchEnd };
 138
 139   QList<ChatLineModel::Word> wplist;  // use a temp list which we'll later copy into a QVector for efficiency
 140   QTextBoundaryFinder finder(QTextBoundaryFinder::Word, _styledMsg->contents().unicode(), length,
 141                               TextBoundaryFinderBuffer, TextBoundaryFinderBufferSize);
 142
 143   int idx;
 144   int oldidx = 0;
 145   bool wordStart = false;
 146   bool wordEnd = false;
 147   Mode mode = SearchEnd;
 148   ChatLineModel::Word word;
 149   word.start = 0;
 150   qreal wordstartx = 0;
 151
 152   QTextLayout layout(_styledMsg->contents());
 153   QTextOption option;
 154   option.setWrapMode(QTextOption::NoWrap);
 155   layout.setTextOption(option);
 156
 157   layout.setAdditionalFormats(QtUi::style()->toTextLayoutList(_styledMsg->contentsFormatList(), length));
 158   layout.beginLayout();
 159   QTextLine line = layout.createLine();
 160   line.setNumColumns(length);
 161   layout.endLayout();
 162
 163   do {
 164     idx = finder.toNextBoundary();
 165     if(idx < 0) {
 166       idx = length;
 167       wordStart = false;
 168       wordEnd = false;
 169       mode = SearchStart;
 170     } else {
 171       wordStart = finder.boundaryReasons().testFlag(QTextBoundaryFinder::StartWord);
 172       wordEnd = finder.boundaryReasons().testFlag(QTextBoundaryFinder::EndWord);
 173     }
 174
 175     //if(flg) qDebug() << idx << mode << wordStart << wordEnd << contents->plainText.left(idx) << contents->plainText.mid(idx);
 176
 177     if(mode == SearchEnd || (!wordStart && wordEnd)) {
 178       if(wordStart || !wordEnd) continue;
 179       oldidx = idx;
 180       mode = SearchStart;
 181       continue;
 182     }
 183     qreal wordendx = line.cursorToX(oldidx);
 184     qreal trailingendx = line.cursorToX(idx);
 185     word.endX = wordendx;
 186     word.width = wordendx - wordstartx;
 187     word.trailing = trailingendx - wordendx;
 188     wordstartx = trailingendx;
 189     wplist.append(word);
 190
 191     if(wordStart) {
 192       word.start = idx;
 193       mode = SearchEnd;
 194     }
 195     // the part " || (finder.position() == contents->plainText.length())" shouldn't be necessary
 196     // but in rare and indeterministic cases Qt states that the end of the text is not a boundary o_O
 197   } while(finder.isAtBoundary() || (finder.position() == length));
 198
 199   // A QVector needs less space than a QList
 200   _wrapList.resize(wplist.count());
 201   for(int i = 0; i < wplist.count(); i++) {
 202     _wrapList[i] = wplist.at(i);
 203   }
 204 }
 205
 206 unsigned char *ChatLineModelItemPrivate::TextBoundaryFinderBuffer = (unsigned char *)malloc(512 * sizeof(HB_CharAttributes_Dummy));
 207 int ChatLineModelItemPrivate::TextBoundaryFinderBufferSize = 512 * (sizeof(HB_CharAttributes_Dummy) / sizeof(unsigned char));
 208
 209 // ****************************************
 210 // the actual ChatLineModelItem
 211 // ****************************************
 212 ChatLineModelItem::ChatLineModelItem(const Message &msg)
 213   : MessageModelItem(msg),
 214     _data(new ChatLineModelItemPrivate(msg))
 215 {
 216 }
 217
 218 ChatLineModelItem::~ChatLineModelItem() {
 219   delete _data;
 220 }
 221
 222 QVariant ChatLineModelItem::data(int column, int role) const {
 223   QVariant d = _data->data((MessageModel::ColumnType)column, role);
 224   if(!d.isValid()) return MessageModelItem::data(column, role);
 225   return d;
 226 }