X-Git-Url: https://git.quassel-irc.org/?p=quassel.git;a=blobdiff_plain;f=src%2Fqtui%2Fchatitem.cpp;h=df093d76d3ec4d5d8e96ad60f700e437099d59f2;hp=c9d20c1e0271a98d7b7bce1373b1a8debfac0ea2;hb=7cef35ccdcb26ad547383537d3615644df703c9a;hpb=279da77e67a66d2e0e239b3d7fd9809ac691dfc8

diff --git a/src/qtui/chatitem.cpp b/src/qtui/chatitem.cpp
index c9d20c1e..df093d76 100644
--- a/src/qtui/chatitem.cpp
+++ b/src/qtui/chatitem.cpp
@@ -18,212 +18,531 @@
  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  ***************************************************************************/
 
+#include <QApplication>
+#include <QClipboard>
+#include <QDesktopServices>
 #include <QFontMetrics>
 #include <QGraphicsSceneMouseEvent>
 #include <QPainter>
+#include <QPalette>
 #include <QTextLayout>
 
 #include "chatitem.h"
 #include "chatlinemodel.h"
 #include "qtui.h"
+#include "qtuistyle.h"
 
-ChatItem::ChatItem(const QPersistentModelIndex &index_, QGraphicsItem *parent) : QGraphicsItem(parent), _index(index_) {
-  _fontMetrics = QtUi::style()->fontMetrics(data(ChatLineModel::FormatRole).value<UiStyle::FormatList>().at(0).second);
-  _layout = 0;
-  _lines = 0;
+ChatItem::ChatItem(const qreal &width, const qreal &height, const QPointF &pos, QGraphicsItem *parent)
+  : QGraphicsItem(parent),
+    _data(0),
+    _boundingRect(0, 0, width, height),
+    _selectionMode(NoSelection),
+    _selectionStart(-1)
+{
+  setAcceptHoverEvents(true);
+  setZValue(20);
+  setPos(pos);
 }
 
 ChatItem::~ChatItem() {
-
+  delete _data;
 }
 
 QVariant ChatItem::data(int role) const {
-  if(!_index.isValid()) {
-    qWarning() << "ChatItem::data(): Model index is invalid!" << _index;
+  QModelIndex index = model()->index(row(), column());
+  if(!index.isValid()) {
+    qWarning() << "ChatItem::data(): model index is invalid!" << index;
     return QVariant();
   }
-  return _index.data(role);
+  return model()->data(index, role);
 }
 
-int ChatItem::setWidth(int w) {
-  w -= 10;
-  if(w == _boundingRect.width()) return _boundingRect.height();
-  _boundingRect.setWidth(w);
-  int h = heightForWidth(w);
-  _boundingRect.setHeight(h);
-  if(haveLayout()) updateLayout();
-  return h;
+QTextLayout *ChatItem::createLayout(QTextOption::WrapMode wrapMode, Qt::Alignment alignment) {
+  QTextLayout *layout = new QTextLayout(data(MessageModel::DisplayRole).toString());
+
+  QTextOption option;
+  option.setWrapMode(wrapMode);
+  option.setAlignment(alignment);
+  layout->setTextOption(option);
+
+  QList<QTextLayout::FormatRange> formatRanges
+         = QtUi::style()->toTextLayoutList(data(MessageModel::FormatRole).value<UiStyle::FormatList>(), layout->text().length());
+  layout->setAdditionalFormats(formatRanges);
+  return layout;
 }
 
-int ChatItem::heightForWidth(int width) {
-  if(data(ChatLineModel::ColumnTypeRole).toUInt() != ChatLineModel::ContentsColumn)
-    return fontMetrics()->lineSpacing(); // only contents can be multi-line
+void ChatItem::updateLayout() {
+  if(!privateData()) {
+    setPrivateData(new ChatItemPrivate(createLayout()));
+  }
+  QTextLayout *layout_ = layout();
+  layout_->beginLayout();
+  QTextLine line = layout_->createLine();
+  if(line.isValid()) {
+    line.setLineWidth(width());
+    line.setPosition(QPointF(0,0));
+  }
+  layout_->endLayout();
+}
 
-  _lines = 1;
-  WrapColumnFinder finder(this);
-  while(finder.nextWrapColumn() > 0) _lines++;
-  return _lines * fontMetrics()->lineSpacing();
+void ChatItem::clearLayout() {
+  delete _data;
+  _data = 0;
 }
 
-ChatItem::WrapColumnFinder::WrapColumnFinder(ChatItem *_item) : item(_item) {
-  wrapList = item->data(ChatLineModel::WrapListRole).value<ChatLineModel::WrapList>();
-  wordidx = 0;
-  layout = 0;
-  lastwrapcol = 0;
-  lastwrappos = 0;
-  w = 0;
+// NOTE: This is not the most time-efficient implementation, but it saves space by not caching unnecessary data
+//       This is a deliberate trade-off. (-> selectFmt creation, data() call)
+void ChatItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) {
+  Q_UNUSED(option); Q_UNUSED(widget);
+  if(!hasLayout())
+    updateLayout();
+  painter->setClipRect(boundingRect()); // no idea why QGraphicsItem clipping won't work
+  //if(_selectionMode == FullSelection) {
+    //painter->save();
+    //painter->fillRect(boundingRect(), QApplication::palette().brush(QPalette::Highlight));
+    //painter->restore();
+  //}
+  QVector<QTextLayout::FormatRange> formats = additionalFormats();
+  if(_selectionMode != NoSelection) {
+    QTextLayout::FormatRange selectFmt;
+    selectFmt.format.setForeground(QApplication::palette().brush(QPalette::HighlightedText));
+    selectFmt.format.setBackground(QApplication::palette().brush(QPalette::Highlight));
+    if(_selectionMode == PartialSelection) {
+      selectFmt.start = qMin(_selectionStart, _selectionEnd);
+      selectFmt.length = qAbs(_selectionStart - _selectionEnd);
+    } else { // FullSelection
+      selectFmt.start = 0;
+      selectFmt.length = data(MessageModel::DisplayRole).toString().length();
+    }
+    formats.append(selectFmt);
+  }
+  layout()->draw(painter, QPointF(0,0), formats, boundingRect());
+
+  // Debuging Stuff
+  // uncomment the following lines to draw the bounding rect and the row number in alternating colors
+//   if(row() % 2)
+//     painter->setPen(Qt::red);
+//   else
+//     painter->setPen(Qt::blue);
+//   QString rowString = QString::number(row());
+//   QRect rowRect = painter->fontMetrics().boundingRect(rowString);
+//   QPointF topPoint = _boundingRect.topLeft();
+//   topPoint.ry() += rowRect.height();
+//   painter->drawText(topPoint, rowString);
+//   QPointF bottomPoint = _boundingRect.bottomRight();
+//   bottomPoint.rx() -= rowRect.width();
+//   painter->drawText(bottomPoint, rowString);
+//   painter->drawRect(_boundingRect.adjusted(0, 0, -1, -1));
 }
 
-ChatItem::WrapColumnFinder::~WrapColumnFinder() {
-  delete layout;
+qint16 ChatItem::posToCursor(const QPointF &pos) {
+  if(pos.y() > height()) return data(MessageModel::DisplayRole).toString().length();
+  if(pos.y() < 0) return 0;
+  if(!hasLayout())
+    updateLayout();
+  for(int l = layout()->lineCount() - 1; l >= 0; l--) {
+    QTextLine line = layout()->lineAt(l);
+    if(pos.y() >= line.y()) {
+      return line.xToCursor(pos.x(), QTextLine::CursorOnCharacter);
+    }
+  }
+  return 0;
 }
 
-int ChatItem::WrapColumnFinder::nextWrapColumn() {
-  while(wordidx < wrapList.count()) {
-    w += wrapList.at(wordidx).width;
-    if(w >= item->width()) {
-      if(lastwrapcol >= wrapList.at(wordidx).start) {
-        // first word, and it doesn't fit
-        if(!line.isValid()) {
-          layout = item->createLayout(QTextOption::NoWrap);
-          layout->beginLayout();
-          line = layout->createLine();
-          line.setLineWidth(item->width());
-          layout->endLayout();
-        }
-        int idx = line.xToCursor(lastwrappos + item->width());
-        qreal x = line.cursorToX(idx);
-        w = w - wrapList.at(wordidx).width - (x - lastwrappos);
-        lastwrappos = x;
-        lastwrapcol = idx;
-        return idx;
+void ChatItem::setFullSelection() {
+  if(_selectionMode != FullSelection) {
+    _selectionMode = FullSelection;
+    update();
+  }
+}
+
+void ChatItem::clearSelection() {
+  _selectionMode = NoSelection;
+  update();
+}
+
+void ChatItem::continueSelecting(const QPointF &pos) {
+  _selectionMode = PartialSelection;
+  _selectionEnd = posToCursor(pos);
+  update();
+}
+
+QList<QRectF> ChatItem::findWords(const QString &searchWord, Qt::CaseSensitivity caseSensitive) {
+  QList<QRectF> resultList;
+  const QAbstractItemModel *model_ = model();
+  if(!model_)
+    return resultList;
+
+  QString plainText = model_->data(model_->index(row(), column()), MessageModel::DisplayRole).toString();
+  QList<int> indexList;
+  int searchIdx = plainText.indexOf(searchWord, 0, caseSensitive);
+  while(searchIdx != -1) {
+    indexList << searchIdx;
+    searchIdx = plainText.indexOf(searchWord, searchIdx + 1, caseSensitive);
+  }
+
+  bool hadLayout = hasLayout();
+  if(!hadLayout)
+    updateLayout();
+
+  foreach(int idx, indexList) {
+    QTextLine line = layout()->lineForTextPosition(idx);
+    qreal x = line.cursorToX(idx);
+    qreal width = line.cursorToX(idx + searchWord.count()) - x;
+    qreal height = line.height();
+    qreal y = height * line.lineNumber();
+    resultList << QRectF(x, y, width, height);
+  }
+
+  if(!hadLayout)
+    clearLayout();
+  return resultList;
+}
+
+void ChatItem::mousePressEvent(QGraphicsSceneMouseEvent *event) {
+  if(event->buttons() == Qt::LeftButton) {
+    chatScene()->setSelectingItem(this);
+    _selectionStart = _selectionEnd = posToCursor(event->pos());
+    _selectionMode = NoSelection; // will be set to PartialSelection by mouseMoveEvent
+    update();
+    event->accept();
+  } else {
+    event->ignore();
+  }
+}
+
+void ChatItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event) {
+  if(event->buttons() == Qt::LeftButton) {
+    if(contains(event->pos())) {
+      qint16 end = posToCursor(event->pos());
+      if(end != _selectionEnd) {
+        _selectionEnd = end;
+        _selectionMode = (_selectionStart != _selectionEnd ? PartialSelection : NoSelection);
+        update();
       }
-      // not the first word, so just wrap before this
-      lastwrapcol = wrapList.at(wordidx).start;
-      lastwrappos = lastwrappos + w - wrapList.at(wordidx).width;
-      w = 0;
-      return lastwrapcol;
+    } else {
+      setFullSelection();
+      chatScene()->startGlobalSelection(this, event->pos());
     }
-    w += wrapList.at(wordidx).trailing;
-    wordidx++;
+    event->accept();
+  } else {
+    event->ignore();
   }
-  return -1;
 }
 
-QTextLayout *ChatItem::createLayout(QTextOption::WrapMode wrapMode) {
-  QTextLayout *layout = new QTextLayout(data(MessageModel::DisplayRole).toString());
+void ChatItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) {
+  if(_selectionMode != NoSelection && !event->buttons() & Qt::LeftButton) {
+    _selectionEnd = posToCursor(event->pos());
+    QString selection
+        = data(MessageModel::DisplayRole).toString().mid(qMin(_selectionStart, _selectionEnd), qAbs(_selectionStart - _selectionEnd));
+    chatScene()->putToClipboard(selection);
+    event->accept();
+  } else {
+    event->ignore();
+  }
+}
 
-  QTextOption option;
-  option.setWrapMode(wrapMode);
-  layout->setTextOption(option);
+// ************************************************************
+// SenderChatItem
+// ************************************************************
 
-  QList<QTextLayout::FormatRange> formatRanges
-         = QtUi::style()->toTextLayoutList(data(MessageModel::FormatRole).value<UiStyle::FormatList>(), layout->text().length());
-  layout->setAdditionalFormats(formatRanges);
-  return layout;
+// ************************************************************
+// ContentsChatItem
+// ************************************************************
+ContentsChatItem::ContentsChatItem(const qreal &width, const QPointF &pos, QGraphicsItem *parent)
+  : ChatItem(0, 0, pos, parent)
+{
+  const QAbstractItemModel *model_ = model();
+  QModelIndex index = model_->index(row(), column());
+  _fontMetrics = QtUi::style()->fontMetrics(model_->data(index, ChatLineModel::FormatRole).value<UiStyle::FormatList>().at(0).second);
+
+  setGeometryByWidth(width);
 }
 
-void ChatItem::updateLayout() {
-  if(!haveLayout()) _layout = createLayout(QTextOption::WrapAnywhere);
+qreal ContentsChatItem::setGeometryByWidth(qreal w) {
+  if(w != width()) {
+    setWidth(w);
+    // compute height
+    int lines = 1;
+    WrapColumnFinder finder(this);
+    while(finder.nextWrapColumn() > 0)
+      lines++;
+    setHeight(lines * fontMetrics()->lineSpacing());
+  }
+  return height();
+}
+
+void ContentsChatItem::updateLayout() {
+  if(!privateData()) {
+    ContentsChatItemPrivate *data = new ContentsChatItemPrivate(createLayout(QTextOption::WrapAnywhere), findClickables(), this);
+    setPrivateData(data);
+  }
 
   // Now layout
   ChatLineModel::WrapList wrapList = data(ChatLineModel::WrapListRole).value<ChatLineModel::WrapList>();
   if(!wrapList.count()) return; // empty chatitem
-  int wordidx = 0;
-  ChatLineModel::Word word = wrapList.at(0);
 
   qreal h = 0;
   WrapColumnFinder finder(this);
-  _layout->beginLayout();
+  layout()->beginLayout();
   forever {
-    QTextLine line = _layout->createLine();
-    if (!line.isValid())
+    QTextLine line = layout()->createLine();
+    if(!line.isValid())
       break;
 
     int col = finder.nextWrapColumn();
-    line.setNumColumns(col >= 0 ? col - line.textStart() : _layout->text().length());
-
-    h += fontMetrics()->leading();
+    line.setNumColumns(col >= 0 ? col - line.textStart() : layout()->text().length());
     line.setPosition(QPointF(0, h));
-    h += line.height();
+    h += fontMetrics()->lineSpacing();
   }
-  _layout->endLayout();
+  layout()->endLayout();
 }
 
-void ChatItem::clearLayout() {
-  delete _layout;
-  _layout = 0;
+// NOTE: This method is not threadsafe and not reentrant!
+//       (RegExps are not constant while matching, and they are static here for efficiency)
+QList<ContentsChatItem::Clickable> ContentsChatItem::findClickables() {
+  // For matching URLs
+  static QString urlEnd("(?:>|[,.;:\"]*\\s|\\b|$)");
+  static QString urlChars("(?:[\\w\\-~@/?&=+$()!%#]|[,.;:]\\w)");
+
+  static QRegExp regExp[] = {
+    // URL
+    // QRegExp(QString("((?:https?://|s?ftp://|irc://|mailto:|www\\.)%1+|%1+\\.[a-z]{2,4}(?:?=/%1+|\\b))%2").arg(urlChars, urlEnd)),
+    QRegExp(QString("((?:(?:https?://|s?ftp://|irc://|mailto:)|www)%1+)%2").arg(urlChars, urlEnd)),
+
+    // Channel name
+    // We don't match for channel names starting with + or &, because that gives us a lot of false positives.
+    QRegExp("((?:#|![A-Z0-9]{5})[^,:\\s]+(?::[^,:\\s]+)?)\\b")
+
+    // TODO: Nicks, we'll need a filtering for only matching known nicknames further down if we do this
+  };
+
+  static const int regExpCount = 2;  // number of regexps in the array above
+
+  qint16 matches[] = { 0, 0, 0 };
+  qint16 matchEnd[] = { 0, 0, 0 };
+
+  QString str = data(ChatLineModel::DisplayRole).toString();
+
+  QList<Clickable> result;
+  qint16 idx = 0;
+  qint16 minidx;
+  int type = -1;
+
+  do {
+    type = -1;
+    minidx = str.length();
+    for(int i = 0; i < regExpCount; i++) {
+      if(matches[i] < 0 || matchEnd[i] > str.length()) continue;
+      if(idx >= matchEnd[i]) {
+        matches[i] = str.indexOf(regExp[i], qMax(matchEnd[i], idx));
+        if(matches[i] >= 0) matchEnd[i] = matches[i] + regExp[i].cap(1).length();
+      }
+      if(matches[i] >= 0 && matches[i] < minidx) {
+        minidx = matches[i];
+        type = i;
+      }
+    }
+    if(type >= 0) {
+      idx = matchEnd[type];
+      if(type == Clickable::Url && str.at(idx-1) == ')') {  // special case: closing paren only matches if we had an open one
+        if(!str.mid(matches[type], matchEnd[type]-matches[type]).contains('(')) matchEnd[type]--;
+      }
+      result.append(Clickable((Clickable::Type)type, matches[type], matchEnd[type] - matches[type]));
+    }
+  } while(type >= 0);
+
+  /* testing
+  if(!result.isEmpty()) qDebug() << str;
+  foreach(Clickable click, result) {
+    qDebug() << str.mid(click.start, click.length);
+  }
+  */
+  return result;
 }
 
-//int ChatItem::findNextWrapColumn(
+QVector<QTextLayout::FormatRange> ContentsChatItem::additionalFormats() const {
+  // mark a clickable if hovered upon
+  QVector<QTextLayout::FormatRange> fmt;
+  if(privateData()->currentClickable.isValid()) {
+    Clickable click = privateData()->currentClickable;
+    QTextLayout::FormatRange f;
+    f.start = click.start;
+    f.length = click.length;
+    f.format.setFontUnderline(true);
+    fmt.append(f);
+  }
+  return fmt;
+}
 
-void ChatItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) {
-  Q_UNUSED(option); Q_UNUSED(widget);
-  if(!haveLayout()) updateLayout();
-  _layout->draw(painter, QPointF(0,0), QVector<QTextLayout::FormatRange>(), boundingRect());
-  painter->drawRect(boundingRect());
-  int width = 0;
-  QVariantList wrapList = data(ChatLineModel::WrapListRole).toList();
-  for(int i = 2; i < wrapList.count(); i+=2) {
-    QRect r(wrapList[i-1].toUInt(), 0, wrapList[i+1].toUInt() - wrapList[i-1].toUInt(), fontMetrics()->lineSpacing());
-    painter->drawRect(r);
-  }
-}
-
-
-/*
-void ChatItem::layout() {
-  if(!_layout.additionalFormats().count()) return; // no text set
-  if(_width <= 0) return;
-  prepareGeometryChange();
-  QFontMetrics metrics(_layout.additionalFormats()[0].format.font());
-  int leading = metrics.leading();
-  int height = 0;
-  _layout.setTextOption(textOption());
-  _layout.beginLayout();
-  while(1) {
-    QTextLine line = _layout.createLine();
-    if(!line.isValid()) break;
-    line.setLineWidth(_width);
-    if(textOption().wrapMode() != QTextOption::NoWrap && line.naturalTextWidth() > _width) {
-      // word did not fit, we need to wrap it in the middle
-      // this is a workaround for Qt failing to handle WrapAtWordBoundaryOrAnywhere correctly
-      QTextOption::WrapMode mode = textOption().wrapMode();
-      textOption().setWrapMode(QTextOption::WrapAnywhere);
-      _layout.setTextOption(textOption());
-      line.setLineWidth(_width);
-      textOption().setWrapMode(mode);
-      _layout.setTextOption(textOption());
+void ContentsChatItem::endHoverMode() {
+  if(hasLayout()) {
+    if(privateData()->currentClickable.isValid()) {
+      setCursor(Qt::ArrowCursor);
+      privateData()->currentClickable = Clickable();
     }
-    height += leading;
-    line.setPosition(QPoint(0, height));
-    height += line.height();
+    clearWebPreview();
+    update();
   }
-  _layout.endLayout();
-  update();
-}    QDateTime _timestamp;
-    MsgId _msgId;
+}
 
+void ContentsChatItem::mousePressEvent(QGraphicsSceneMouseEvent *event) {
+  privateData()->hasDragged = false;
+  ChatItem::mousePressEvent(event);
+}
 
-QRectF ChatItem::boundingRect() const {
-  return _layout.boundingRect();
+void ContentsChatItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) {
+  if(!event->buttons() && !privateData()->hasDragged) {
+    // got a click
+    Clickable click = privateData()->currentClickable;
+    if(click.isValid()) {
+      QString str = data(ChatLineModel::DisplayRole).toString().mid(click.start, click.length);
+      switch(click.type) {
+        case Clickable::Url:
+	  if(!str.contains("://"))
+	    str = "http://" + str;
+          QDesktopServices::openUrl(str);
+          break;
+        case Clickable::Channel:
+          // TODO join or whatever...
+          break;
+        default:
+          break;
+      }
+    }
+  }
+  ChatItem::mouseReleaseEvent(event);
 }
 
-void ChatItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) {
-  Q_UNUSED(option); Q_UNUSED(widget);
-  _layout.draw(painter, QPointF(0, 0));
+void ContentsChatItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event) {
+  // mouse move events always mean we're not hovering anymore...
+  endHoverMode();
+  // also, check if we have dragged the mouse
+  if(hasLayout() && !privateData()->hasDragged && event->buttons() & Qt::LeftButton
+    && (event->buttonDownScreenPos(Qt::LeftButton) - event->screenPos()).manhattanLength() >= QApplication::startDragDistance())
+    privateData()->hasDragged = true;
+  ChatItem::mouseMoveEvent(event);
+}
 
+void ContentsChatItem::hoverLeaveEvent(QGraphicsSceneHoverEvent *event) {
+  endHoverMode();
+  event->accept();
 }
-*/
 
-/*
-void ChatItem::mouseMoveEvent ( QGraphicsSceneMouseEvent * event ) {
-  qDebug() << (void*)this << "moving" << event->pos();
-  if(event->pos().y() < 0) {
-    QTextCursor cursor(document());
-    //cursor.insertText("foo");
-    //cursor.select(QTextCursor::Document);
-    event->ignore();
-  } else QGraphicsTextItem::mouseMoveEvent(event);
+void ContentsChatItem::hoverMoveEvent(QGraphicsSceneHoverEvent *event) {
+  bool onClickable = false;
+  qint16 idx = posToCursor(event->pos());
+  for(int i = 0; i < privateData()->clickables.count(); i++) {
+    Clickable click = privateData()->clickables.at(i);
+    if(idx >= click.start && idx < click.start + click.length) {
+      if(click.type == Clickable::Url) {
+        onClickable = true;
+	showWebPreview(click);
+      } else if(click.type == Clickable::Channel) {
+        // TODO: don't make clickable if it's our own name
+        //onClickable = true; //FIXME disabled for now
+      }
+      if(onClickable) {
+        setCursor(Qt::PointingHandCursor);
+        privateData()->currentClickable = click;
+        update();
+        break;
+      }
+    }
+  }
+  if(!onClickable) endHoverMode();
+  event->accept();
+}
+
+void ContentsChatItem::showWebPreview(const Clickable &click) {
+#ifdef HAVE_WEBKIT
+  if(!hasLayout())
+    updateLayout();
+
+  QTextLine line = layout()->lineForTextPosition(click.start);
+  qreal x = line.cursorToX(click.start);
+  qreal width = line.cursorToX(click.start + click.length) - x;
+  qreal height = line.height();
+  qreal y = height * line.lineNumber();
+
+  QPointF topLeft = scenePos() + QPointF(x, y);
+  QRectF urlRect = QRectF(topLeft.x(), topLeft.y(), width, height);
+
+  QString url = data(ChatLineModel::DisplayRole).toString().mid(click.start, click.length);
+  if(!url.contains("://"))
+    url = "http://" + url;
+  chatScene()->loadWebPreview(this, url, urlRect);
+#endif
+}
+
+void ContentsChatItem::clearWebPreview() {
+#ifdef HAVE_WEBKIT
+  chatScene()->clearWebPreview(this);
+#endif
+}
+
+/*************************************************************************************************/
+
+ContentsChatItem::WrapColumnFinder::WrapColumnFinder(ChatItem *_item)
+  : item(_item),
+    layout(0),
+    wrapList(item->data(ChatLineModel::WrapListRole).value<ChatLineModel::WrapList>()),
+    wordidx(0),
+    lineCount(0),
+    choppedTrailing(0)
+{
+}
+
+ContentsChatItem::WrapColumnFinder::~WrapColumnFinder() {
+  delete layout;
+}
+
+qint16 ContentsChatItem::WrapColumnFinder::nextWrapColumn() {
+  if(wordidx >= wrapList.count())
+    return -1;
+
+  lineCount++;
+  qreal targetWidth = lineCount * item->width() + choppedTrailing;
+
+  qint16 start = wordidx;
+  qint16 end = wrapList.count() - 1;
+
+  // check if the whole line fits
+  if(wrapList.at(end).endX <= targetWidth) //  || start == end)
+    return -1;
+
+  // check if we have a very long word that needs inter word wrap
+  if(wrapList.at(start).endX > targetWidth) {
+    if(!line.isValid()) {
+      layout = item->createLayout(QTextOption::NoWrap);
+      layout->beginLayout();
+      line = layout->createLine();
+      layout->endLayout();
+    }
+    return line.xToCursor(targetWidth, QTextLine::CursorOnCharacter);
+  }
+
+  while(true) {
+    if(start + 1 == end) {
+      wordidx = end;
+      const ChatLineModel::Word &lastWord = wrapList.at(start); // the last word we were able to squeeze in
+
+      // both cases should be cought preliminary
+      Q_ASSERT(lastWord.endX <= targetWidth); // ensure that "start" really fits in
+      Q_ASSERT(end < wrapList.count()); // ensure that start isn't the last word
+
+      choppedTrailing += lastWord.trailing - (targetWidth - lastWord.endX);
+      return wrapList.at(wordidx).start;
+    }
+
+    qint16 pivot = (end + start) / 2;
+    if(wrapList.at(pivot).endX > targetWidth) {
+      end = pivot;
+    } else {
+      start = pivot;
+    }
+  }
+  Q_ASSERT(false);
+  return -1;
 }
-*/
+