X-Git-Url: https://git.quassel-irc.org/?p=quassel.git;a=blobdiff_plain;f=src%2Fqtui%2Fchatscene.cpp;h=c062082254e451879e4f7be866d6431e83f3b448;hp=b5dd4528cb26e5c01544130c0b67e0638012f96c;hb=5cc01948319761863c121a74dc1e7b1c182beaa6;hpb=d77cc962c2bc0de9e6288020804842ffe116f838

diff --git a/src/qtui/chatscene.cpp b/src/qtui/chatscene.cpp
index b5dd4528..c0620822 100644
--- a/src/qtui/chatscene.cpp
+++ b/src/qtui/chatscene.cpp
@@ -22,6 +22,7 @@
 #include <QClipboard>
 #include <QGraphicsSceneMouseEvent>
 #include <QPersistentModelIndex>
+#include <QWebView>
 
 #include "chatitem.h"
 #include "chatline.h"
@@ -46,10 +47,10 @@ ChatScene::ChatScene(QAbstractItemModel *model, const QString &idString, qreal w
     _sceneRect(0, 0, width, 0),
     _firstLineRow(-1),
     _viewportHeight(0),
+    _cutoffMode(CutoffRight),
     _selectingItem(0),
     _selectionStart(-1),
-    _isSelecting(false),
-    _lastBacklogSize(0)
+    _isSelecting(false)
 {
   MessageFilter *filter = qobject_cast<MessageFilter*>(model);
   if(filter) {
@@ -61,20 +62,21 @@ ChatScene::ChatScene(QAbstractItemModel *model, const QString &idString, qreal w
   int defaultSecondColHandlePos = defaultSettings.value("SecondColumnHandlePos", 200).toInt();
 
   ChatViewSettings viewSettings(this);
-  firstColHandlePos = viewSettings.value("FirstColumnHandlePos", defaultFirstColHandlePos).toInt();
-  secondColHandlePos = viewSettings.value("SecondColumnHandlePos", defaultSecondColHandlePos).toInt();
+  _firstColHandlePos = viewSettings.value("FirstColumnHandlePos", defaultFirstColHandlePos).toInt();
+  _secondColHandlePos = viewSettings.value("SecondColumnHandlePos", defaultSecondColHandlePos).toInt();
 
-  firstColHandle = new ColumnHandleItem(QtUi::style()->firstColumnSeparator());
-  addItem(firstColHandle);
-  firstColHandle->setXPos(firstColHandlePos);
-  connect(firstColHandle, SIGNAL(positionChanged(qreal)), this, SLOT(handlePositionChanged(qreal)));
-  connect(this, SIGNAL(sceneRectChanged(const QRectF &)), firstColHandle, SLOT(sceneRectChanged(const QRectF &)));
+  _firstColHandle = new ColumnHandleItem(QtUi::style()->firstColumnSeparator());
+  addItem(_firstColHandle);
+  _firstColHandle->setXPos(_firstColHandlePos);
+  connect(_firstColHandle, SIGNAL(positionChanged(qreal)), this, SLOT(firstHandlePositionChanged(qreal)));
+  connect(this, SIGNAL(sceneRectChanged(const QRectF &)), _firstColHandle, SLOT(sceneRectChanged(const QRectF &)));
 
-  secondColHandle = new ColumnHandleItem(QtUi::style()->secondColumnSeparator());
-  addItem(secondColHandle);
-  secondColHandle->setXPos(secondColHandlePos);
-  connect(secondColHandle, SIGNAL(positionChanged(qreal)), this, SLOT(handlePositionChanged(qreal)));
-  connect(this, SIGNAL(sceneRectChanged(const QRectF &)), secondColHandle, SLOT(sceneRectChanged(const QRectF &)));
+  _secondColHandle = new ColumnHandleItem(QtUi::style()->secondColumnSeparator());
+  addItem(_secondColHandle);
+  _secondColHandle->setXPos(_secondColHandlePos);
+  connect(_secondColHandle, SIGNAL(positionChanged(qreal)), this, SLOT(secondHandlePositionChanged(qreal)));
+
+  connect(this, SIGNAL(sceneRectChanged(const QRectF &)), _secondColHandle, SLOT(sceneRectChanged(const QRectF &)));
 
   setHandleXLimits();
 
@@ -85,6 +87,15 @@ ChatScene::ChatScene(QAbstractItemModel *model, const QString &idString, qreal w
 
   if(model->rowCount() > 0)
     rowsInserted(QModelIndex(), 0, model->rowCount() - 1);
+
+#ifdef HAVE_WEBKIT
+  webPreview.delayTimer.setSingleShot(true);
+  connect(&webPreview.delayTimer, SIGNAL(timeout()), this, SLOT(showWebPreviewEvent()));
+  webPreview.deleteTimer.setInterval(600000);
+  connect(&webPreview.deleteTimer, SIGNAL(timeout()), this, SLOT(deleteWebPreviewEvent()));
+#endif
+
+  setItemIndexMethod(QGraphicsScene::NoIndex);
 }
 
 ChatScene::~ChatScene() {
@@ -92,28 +103,21 @@ ChatScene::~ChatScene() {
 
 void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
   Q_UNUSED(index);
-
-  clearWebPreview();
-
 //   QModelIndex sidx = model()->index(start, 0);
 //   QModelIndex eidx = model()->index(end, 0);
 //   qDebug() << "rowsInserted" << start << end << "-" << sidx.data(MessageModel::MsgIdRole).value<MsgId>() << eidx.data(MessageModel::MsgIdRole).value<MsgId>();
 
   qreal h = 0;
-  qreal y = _sceneRect.y();
+  qreal y = 0;
   qreal width = _sceneRect.width();
-  bool atTop = true;
-  bool atBottom = false;
+  bool atBottom = (start == _lines.count());
+  bool atTop = !atBottom && (start == 0);
   bool moveTop = false;
 
-  if(start > 0 && start < _lines.count()) {
+  if(start < _lines.count()) {
     y = _lines.value(start)->y();
-    atTop = false;
-  }
-  if(start == _lines.count()) {
-    y = _sceneRect.bottom();
-    atTop = false;
-    atBottom = true;
+  } else if(atBottom && !_lines.isEmpty()) {
+    y = _lines.last()->y() + _lines.last()->height();
   }
 
   qreal contentsWidth = width - secondColumnHandle()->sceneRight();
@@ -122,20 +126,28 @@ void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
   QPointF contentsPos(secondColumnHandle()->sceneRight(), 0);
   QPointF senderPos(firstColumnHandle()->sceneRight(), 0);
 
-  for(int i = start; i <= end; i++) {
-    ChatLine *line = new ChatLine(i, model(),
-				  width,
-				  timestampWidth, senderWidth, contentsWidth,
-				  senderPos, contentsPos);
-    if(atTop) {
+  if(atTop) {
+    for(int i = end; i >= start; i--) {
+      ChatLine *line = new ChatLine(i, model(),
+				    width,
+				    timestampWidth, senderWidth, contentsWidth,
+				    senderPos, contentsPos);
       h += line->height();
       line->setPos(0, y-h);
-    } else {
+      _lines.insert(start, line);
+      addItem(line);
+    }
+  } else {
+    for(int i = start; i <= end; i++) {
+      ChatLine *line = new ChatLine(i, model(),
+				    width,
+				    timestampWidth, senderWidth, contentsWidth,
+				    senderPos, contentsPos);
       line->setPos(0, y+h);
       h += line->height();
+      _lines.insert(i, line);
+      addItem(line);
     }
-    _lines.insert(i, line);
-    addItem(line);
   }
 
   // update existing items
@@ -153,10 +165,10 @@ void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
   }
 
   // neither pre- or append means we have to do dirty work: move items...
+  int moveStart = 0;
+  int moveEnd = _lines.count() - 1;
+  qreal offset = h;
   if(!(atTop || atBottom)) {
-    qreal offset = h;
-    int moveStart = 0;
-    int moveEnd = _lines.count() - 1;
     // move top means: moving 0 to end (aka: end + 1)
     // move top means: moving end + 1 to _lines.count() - 1 (aka: _lines.count() - (end + 1)
     if(end + 1 < _lines.count() - end - 1) {
@@ -166,7 +178,7 @@ void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
       moveEnd = end;
     } else {
       // move bottom part
-      moveStart = start;
+      moveStart = end + 1;
     }
     ChatLine *line = 0;
     for(int i = moveStart; i <= moveEnd; i++) {
@@ -175,6 +187,28 @@ void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
     }
   }
 
+  // check if all went right
+  Q_ASSERT(start == 0 || _lines.at(start - 1)->pos().y() + _lines.at(start - 1)->height() == _lines.at(start)->pos().y());
+//   if(start != 0) {
+//     if(_lines.at(start - 1)->pos().y() + _lines.at(start - 1)->height() != _lines.at(start)->pos().y()) {
+//       qDebug() << "lines:" << _lines.count() << "start:" << start << "end:" << end;
+//       qDebug() << "line[start - 1]:" << _lines.at(start - 1)->pos().y() << "+" << _lines.at(start - 1)->height() << "=" << _lines.at(start - 1)->pos().y() + _lines.at(start - 1)->height();
+//       qDebug() << "line[start]" << _lines.at(start)->pos().y();
+//       qDebug() << "needed moving:" << !(atTop || atBottom) << moveTop << moveStart << moveEnd << offset;
+//       Q_ASSERT(false)
+//     }
+//   }
+  Q_ASSERT(end + 1 == _lines.count() || _lines.at(end)->pos().y() + _lines.at(end)->height() == _lines.at(end + 1)->pos().y());
+//   if(end + 1 < _lines.count()) {
+//     if(_lines.at(end)->pos().y() + _lines.at(end)->height() != _lines.at(end + 1)->pos().y()) {
+//       qDebug() << "lines:" << _lines.count() << "start:" << start << "end:" << end;
+//       qDebug() << "line[end]:" << _lines.at(end)->pos().y() << "+" << _lines.at(end)->height() << "=" << _lines.at(end)->pos().y() + _lines.at(end)->height();
+//       qDebug() << "line[end+1]" << _lines.at(end + 1)->pos().y();
+//       qDebug() << "needed moving:" << !(atTop || atBottom) << moveTop << moveStart << moveEnd << offset;
+//       Q_ASSERT(false);
+//     }
+//   }
+
   if(!atBottom) {
     if(start < _firstLineRow) {
       int prevFirstLineRow = _firstLineRow + (end - start + 1);
@@ -186,17 +220,14 @@ void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
     _firstLineRow = -1;
   }
   updateSceneRect();
-  if(atBottom) {
-    emit lastLineChanged(_lines.last());
+  if(atBottom || (!atTop && !moveTop)) {
+    emit lastLineChanged(_lines.last(), h);
   }
-
 }
 
 void ChatScene::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end) {
   Q_UNUSED(parent);
 
-  clearWebPreview();
-
   qreal h = 0; // total height of removed items;
 
   bool atTop = (start == 0);
@@ -252,6 +283,7 @@ void ChatScene::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int e
     }
   }
 
+  Q_ASSERT(start == 0 || start >= _lines.count() || _lines.at(start - 1)->pos().y() + _lines.at(start - 1)->height() == _lines.at(start)->pos().y());
 
   // update sceneRect
   // when searching for the first non-date-line we have to take into account that our
@@ -279,45 +311,25 @@ void ChatScene::updateForViewport(qreal width, qreal height) {
   setWidth(width);
 }
 
-// setWidth is used for 2 things:
-//  a) updating the scene to fit the width of the corresponding view
-//  b) to update the positions of the items if a columhandle has changed it's position
-// forceReposition is true in the second case
-// this method features some codeduplication for the sake of performance
-void ChatScene::setWidth(qreal width, bool forceReposition) {
-  if(width == _sceneRect.width() && !forceReposition)
+void ChatScene::setWidth(qreal width) {
+  if(width == _sceneRect.width())
     return;
 
-//   clock_t startT = clock();
+  // clock_t startT = clock();
+
+  // disabling the index while doing this complex updates is about
+  // 2 to 10 times faster!
+  //setItemIndexMethod(QGraphicsScene::NoIndex);
 
-  qreal linePos = _sceneRect.y() + _sceneRect.height();
   QList<ChatLine *>::iterator lineIter = _lines.end();
   QList<ChatLine *>::iterator lineIterBegin = _lines.begin();
-  ChatLine *line = 0;
-  qreal lineHeight = 0;
+  qreal linePos = _sceneRect.y() + _sceneRect.height();
   qreal contentsWidth = width - secondColumnHandle()->sceneRight();
-
-  if(forceReposition) {
-    qreal timestampWidth = firstColumnHandle()->sceneLeft();
-    qreal senderWidth = secondColumnHandle()->sceneLeft() - firstColumnHandle()->sceneRight();
-    QPointF senderPos(firstColumnHandle()->sceneRight(), 0);
-    QPointF contentsPos(secondColumnHandle()->sceneRight(), 0);
-    while(lineIter != lineIterBegin) {
-      lineIter--;
-      line = *lineIter;
-      lineHeight = line->setColumns(timestampWidth, senderWidth, contentsWidth, senderPos, contentsPos);
-      linePos -= lineHeight;
-      line->setPos(0, linePos);
-    }
-  } else {
-    while(lineIter != lineIterBegin) {
-      lineIter--;
-      line = *lineIter;
-      lineHeight = line->setGeometryByWidth(width, contentsWidth);
-      linePos -= lineHeight;
-      line->setPos(0, linePos);
-    }
+  while(lineIter != lineIterBegin) {
+    lineIter--;
+    (*lineIter)->setGeometryByWidth(width, contentsWidth, linePos);
   }
+  //setItemIndexMethod(QGraphicsScene::BspTreeIndex);
 
   updateSceneRect(width);
   setHandleXLimits();
@@ -326,34 +338,77 @@ void ChatScene::setWidth(qreal width, bool forceReposition) {
 //   qDebug() << "resized" << _lines.count() << "in" << (float)(endT - startT) / CLOCKS_PER_SEC << "sec";
 }
 
-void ChatScene::handlePositionChanged(qreal xpos) {
-  bool first = (sender() == firstColHandle);
-  qreal oldx;
-  if(first) {
-    oldx = firstColHandlePos;
-    firstColHandlePos = xpos;
-  } else {
-    oldx = secondColHandlePos;
-    secondColHandlePos = xpos;
-  }
+void ChatScene::firstHandlePositionChanged(qreal xpos) {
+  if(_firstColHandlePos == xpos)
+    return;
 
+  _firstColHandlePos = xpos;
   ChatViewSettings viewSettings(this);
-  viewSettings.setValue("FirstColumnHandlePos", firstColHandlePos);
-  viewSettings.setValue("SecondColumnHandlePos", secondColHandlePos);
+  viewSettings.setValue("FirstColumnHandlePos", _firstColHandlePos);
+  ChatViewSettings defaultSettings;
+  defaultSettings.setValue("FirstColumnHandlePos", _firstColHandlePos);
+
+  // clock_t startT = clock();
+
+  // disabling the index while doing this complex updates is about
+  // 2 to 10 times faster!
+  //setItemIndexMethod(QGraphicsScene::NoIndex);
+
+  QList<ChatLine *>::iterator lineIter = _lines.end();
+  QList<ChatLine *>::iterator lineIterBegin = _lines.begin();
+  qreal timestampWidth = firstColumnHandle()->sceneLeft();
+  qreal senderWidth = secondColumnHandle()->sceneLeft() - firstColumnHandle()->sceneRight();
+  QPointF senderPos(firstColumnHandle()->sceneRight(), 0);
 
+  while(lineIter != lineIterBegin) {
+    lineIter--;
+    (*lineIter)->setFirstColumn(timestampWidth, senderWidth, senderPos);
+  }
+  //setItemIndexMethod(QGraphicsScene::BspTreeIndex);
+
+  setHandleXLimits();
+
+//   clock_t endT = clock();
+//   qDebug() << "resized" << _lines.count() << "in" << (float)(endT - startT) / CLOCKS_PER_SEC << "sec";
+}
+
+void ChatScene::secondHandlePositionChanged(qreal xpos) {
+  if(_secondColHandlePos == xpos)
+    return;
+
+  _secondColHandlePos = xpos;
+  ChatViewSettings viewSettings(this);
+  viewSettings.setValue("SecondColumnHandlePos", _secondColHandlePos);
   ChatViewSettings defaultSettings;
-  defaultSettings.setValue("FirstColumnHandlePos", firstColHandlePos);
-  defaultSettings.setValue("SecondColumnHandlePos", secondColHandlePos);
+  defaultSettings.setValue("SecondColumnHandlePos", _secondColHandlePos);
+
+  // clock_t startT = clock();
+
+  // disabling the index while doing this complex updates is about
+  // 2 to 10 times faster!
+  //setItemIndexMethod(QGraphicsScene::NoIndex);
+
+  QList<ChatLine *>::iterator lineIter = _lines.end();
+  QList<ChatLine *>::iterator lineIterBegin = _lines.begin();
+  qreal linePos = _sceneRect.y() + _sceneRect.height();
+  qreal senderWidth = secondColumnHandle()->sceneLeft() - firstColumnHandle()->sceneRight();
+  qreal contentsWidth = _sceneRect.width() - secondColumnHandle()->sceneRight();
+  QPointF contentsPos(secondColumnHandle()->sceneRight(), 0);
+  while(lineIter != lineIterBegin) {
+    lineIter--;
+    (*lineIter)->setSecondColumn(senderWidth, contentsWidth, contentsPos, linePos);
+  }
+  //setItemIndexMethod(QGraphicsScene::BspTreeIndex);
 
-  setWidth(width(), true);  // readjust all chatlines
-  // we get ugly redraw errors if we don't update this explicitly... :(
-  // width() should be the same for both handles, so just use firstColHandle regardless
-  //update(qMin(oldx, xpos), 0, qMax(oldx, xpos) + firstColHandle->width(), height());
+  setHandleXLimits();
+
+//   clock_t endT = clock();
+//   qDebug() << "resized" << _lines.count() << "in" << (float)(endT - startT) / CLOCKS_PER_SEC << "sec";
 }
 
 void ChatScene::setHandleXLimits() {
-  firstColHandle->setXLimits(0, secondColHandle->sceneLeft());
-  secondColHandle->setXLimits(firstColHandle->sceneRight(), width() - minContentsWidth);
+  _firstColHandle->setXLimits(0, _secondColHandle->sceneLeft());
+  _secondColHandle->setXLimits(_firstColHandle->sceneRight(), width() - minContentsWidth);
 }
 
 void ChatScene::setSelectingItem(ChatItem *item) {
@@ -372,13 +427,13 @@ void ChatScene::startGlobalSelection(ChatItem *item, const QPointF &itemPos) {
 void ChatScene::updateSelection(const QPointF &pos) {
   // This is somewhat hacky... we look at the contents item that is at the cursor's y position (ignoring x), since
   // it has the full height. From this item, we can then determine the row index and hence the ChatLine.
-  ChatItem *contentItem = static_cast<ChatItem *>(itemAt(QPointF(secondColHandle->sceneRight() + 1, pos.y())));
+  ChatItem *contentItem = static_cast<ChatItem *>(itemAt(QPointF(_secondColHandle->sceneRight() + 1, pos.y())));
   if(!contentItem) return;
 
   int curRow = contentItem->row();
   int curColumn;
-  if(pos.x() > secondColHandle->sceneRight()) curColumn = ChatLineModel::ContentsColumn;
-  else if(pos.x() > firstColHandlePos) curColumn = ChatLineModel::SenderColumn;
+  if(pos.x() > _secondColHandle->sceneRight()) curColumn = ChatLineModel::ContentsColumn;
+  else if(pos.x() > _firstColHandlePos) curColumn = ChatLineModel::SenderColumn;
   else curColumn = ChatLineModel::TimestampColumn;
 
   ChatLineModel::ColumnType minColumn = (ChatLineModel::ColumnType)qMin(curColumn, _selectionStartCol);
@@ -485,32 +540,24 @@ QString ChatScene::selectionToString() const {
 }
 
 void ChatScene::requestBacklog() {
-  static const int REQUEST_COUNT = 500;
-  int backlogSize = model()->rowCount();
-  if(isSingleBufferScene() && backlogSize != 0 && _lastBacklogSize + REQUEST_COUNT <= backlogSize) {
-    QModelIndex msgIdx = model()->index(0, 0);
-    while((Message::Type)(model()->data(msgIdx, ChatLineModel::TypeRole).toInt()) == Message::DayChange) {
-      msgIdx = msgIdx.sibling(msgIdx.row() + 1, 0);
-    }
-    MsgId msgId = model()->data(msgIdx, ChatLineModel::MsgIdRole).value<MsgId>();
-    BufferId bufferId = model()->data(msgIdx, ChatLineModel::BufferIdRole).value<BufferId>();
-    _lastBacklogSize = backlogSize;
-    Client::backlogManager()->requestBacklog(bufferId, REQUEST_COUNT, msgId.toInt());
-  }
+  MessageFilter *filter = qobject_cast<MessageFilter*>(model());
+  if(filter)
+    return filter->requestBacklog();
+  return;
 }
 
 int ChatScene::sectionByScenePos(int x) {
-  if(x < firstColHandle->x())
+  if(x < _firstColHandle->x())
     return ChatLineModel::TimestampColumn;
-  if(x < secondColHandle->x())
+  if(x < _secondColHandle->x())
     return ChatLineModel::SenderColumn;
 
   return ChatLineModel::ContentsColumn;
 }
 
-void ChatScene::updateSceneRect() {
+void ChatScene::updateSceneRect(qreal width) {
   if(_lines.isEmpty()) {
-    updateSceneRect(QRectF(0, 0, _sceneRect.width(), 0));
+    updateSceneRect(QRectF(0, 0, width, 0));
     return;
   }
 
@@ -533,21 +580,29 @@ void ChatScene::updateSceneRect() {
   }
 
   // the following call should be safe. If it crashes something went wrong during insert/remove
-  ChatLine *firstLine = _lines.at(_firstLineRow);
-  ChatLine *lastLine = _lines.last();
-  updateSceneRect(QRectF(0, firstLine->pos().y(), _sceneRect.width(), lastLine->pos().y() + lastLine->height() - firstLine->pos().y()));
-}
-
-void ChatScene::updateSceneRect(qreal width) {
-  _sceneRect.setWidth(width);
-  updateSceneRect();
+  if(_firstLineRow < _lines.count()) {
+    ChatLine *firstLine = _lines.at(_firstLineRow);
+    ChatLine *lastLine = _lines.last();
+    updateSceneRect(QRectF(0, firstLine->pos().y(), width, lastLine->pos().y() + lastLine->height() - firstLine->pos().y()));
+  } else {
+    // empty scene rect
+    updateSceneRect(QRectF(0, 0, width, 0));
+  }
 }
 
 void ChatScene::updateSceneRect(const QRectF &rect) {
   _sceneRect = rect;
   setSceneRect(rect);
+  update();
 }
 
+bool ChatScene::event(QEvent *e) {
+  if(e->type() == QEvent::ApplicationPaletteChange) {
+    _firstColHandle->setColor(QApplication::palette().windowText().color());
+    _secondColHandle->setColor(QApplication::palette().windowText().color());
+  }
+  return QGraphicsScene::event(e);
+}
 
 void ChatScene::loadWebPreview(ChatItem *parentItem, const QString &url, const QRectF &urlRect) {
 #ifndef HAVE_WEBKIT
@@ -561,12 +616,17 @@ void ChatScene::loadWebPreview(ChatItem *parentItem, const QString &url, const Q
   if(webPreview.url != url) {
     webPreview.url = url;
     // load a new web view and delete the old one (if exists)
-    if(webPreview.previewItem) {
+    if(webPreview.previewItem && webPreview.previewItem->scene()) {
       removeItem(webPreview.previewItem);
       delete webPreview.previewItem;
     }
     webPreview.previewItem = new WebPreviewItem(url);
-    addItem(webPreview.previewItem);
+    webPreview.delayTimer.start(2000);
+    webPreview.deleteTimer.stop();
+  } else if(webPreview.previewItem && !webPreview.previewItem->scene()) {
+      // we just have to readd the item to the scene
+      webPreview.delayTimer.start(2000);
+      webPreview.deleteTimer.stop();
   }
   if(webPreview.urlRect != urlRect) {
     webPreview.urlRect = urlRect;
@@ -583,19 +643,35 @@ void ChatScene::loadWebPreview(ChatItem *parentItem, const QString &url, const Q
 #endif
 }
 
+void ChatScene::showWebPreviewEvent() {
+#ifdef HAVE_WEBKIT
+  if(webPreview.previewItem)
+    addItem(webPreview.previewItem);
+#endif
+}
+
 void ChatScene::clearWebPreview(ChatItem *parentItem) {
 #ifndef HAVE_WEBKIT
   Q_UNUSED(parentItem)
 #else
   if(parentItem == 0 || webPreview.parentItem == parentItem) {
-    if(webPreview.previewItem) {
+    if(webPreview.previewItem && webPreview.previewItem->scene()) {
       removeItem(webPreview.previewItem);
-      delete webPreview.previewItem;
-      webPreview.previewItem = 0;
+      webPreview.deleteTimer.start();
     }
-    webPreview.parentItem = 0;
-    webPreview.url = QString();
-    webPreview.urlRect = QRectF();
+    webPreview.delayTimer.stop();
+  }
+#endif
+}
+
+void ChatScene::deleteWebPreviewEvent() {
+#ifdef HAVE_WEBKIT
+  if(webPreview.previewItem) {
+    delete webPreview.previewItem;
+    webPreview.previewItem = 0;
   }
+  webPreview.parentItem = 0;
+  webPreview.url = QString();
+  webPreview.urlRect = QRectF();
 #endif
 }