The WebPreviews are now controlled via a neat state machine
[quassel.git] / src / qtui / chatscene.cpp
index f71c857..c6341ec 100644 (file)
@@ -1,5 +1,5 @@
 /***************************************************************************
- *   Copyright (C) 2005-08 by the Quassel Project                          *
+ *   Copyright (C) 2005-09 by the Quassel Project                          *
  *   devel@quassel-irc.org                                                 *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
@@ -20,7 +20,9 @@
 
 #include <QApplication>
 #include <QClipboard>
+#include <QDrag>
 #include <QGraphicsSceneMouseEvent>
+#include <QMenu>
 #include <QPersistentModelIndex>
 #include <QWebView>
 
 #include "chatline.h"
 #include "chatlinemodelitem.h"
 #include "chatscene.h"
+#include "chatview.h"
 #include "client.h"
 #include "clientbacklogmanager.h"
 #include "columnhandleitem.h"
+#include "iconloader.h"
 #include "messagefilter.h"
 #include "qtui.h"
 #include "qtuistyle.h"
 
 const qreal minContentsWidth = 200;
 
-ChatScene::ChatScene(QAbstractItemModel *model, const QString &idString, qreal width, QObject *parent)
-  : QGraphicsScene(0, 0, width, 0, parent),
+ChatScene::ChatScene(QAbstractItemModel *model, const QString &idString, qreal width, ChatView *parent)
+  : QGraphicsScene(0, 0, width, 0, (QObject *)parent),
+    _chatView(parent),
     _idString(idString),
     _model(model),
-    _singleBufferScene(false),
+    _singleBufferId(BufferId()),
     _sceneRect(0, 0, width, 0),
     _firstLineRow(-1),
     _viewportHeight(0),
+    _cutoffMode(CutoffRight),
     _selectingItem(0),
     _selectionStart(-1),
     _isSelecting(false),
-    _lastBacklogSize(0)
+    _clickMode(NoClick),
+    _clickHandled(true),
+    _leftButtonPressed(false)
 {
   MessageFilter *filter = qobject_cast<MessageFilter*>(model);
-  if(filter) {
-    _singleBufferScene = filter->isSingleBufferFilter();
+  if(filter && filter->isSingleBufferFilter()) {
+    _singleBufferId = filter->singleBufferId();
   }
 
   ChatViewSettings defaultSettings;
@@ -75,24 +83,29 @@ ChatScene::ChatScene(QAbstractItemModel *model, const QString &idString, qreal w
   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();
 
   connect(model, SIGNAL(rowsInserted(const QModelIndex &, int, int)),
-         this, SLOT(rowsInserted(const QModelIndex &, int, int)));
+          this, SLOT(rowsInserted(const QModelIndex &, int, int)));
   connect(model, SIGNAL(rowsAboutToBeRemoved(const QModelIndex &, int, int)),
-         this, SLOT(rowsAboutToBeRemoved(const QModelIndex &, int, int)));
+          this, SLOT(rowsAboutToBeRemoved(const QModelIndex &, int, int)));
 
   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()));
+  webPreview.timer.setSingleShot(true);
+  connect(&webPreview.timer, SIGNAL(timeout()), this, SLOT(webPreviewNextStep()));
 #endif
+  _showWebPreview = defaultSettings.showWebPreview();
+  defaultSettings.notify("ShowWebPreview", this, SLOT(showWebPreviewChanged()));
+
+  _clickTimer.setInterval(QApplication::doubleClickInterval());
+  _clickTimer.setSingleShot(true);
+  connect(&_clickTimer, SIGNAL(timeout()), SLOT(clickTimeout()));
 
   setItemIndexMethod(QGraphicsScene::NoIndex);
 }
@@ -100,27 +113,64 @@ ChatScene::ChatScene(QAbstractItemModel *model, const QString &idString, qreal w
 ChatScene::~ChatScene() {
 }
 
+ChatView *ChatScene::chatView() const {
+  return _chatView;
+}
+
+ColumnHandleItem *ChatScene::firstColumnHandle() const {
+  return _firstColHandle;
+}
+
+ColumnHandleItem *ChatScene::secondColumnHandle() const {
+  return _secondColHandle;
+}
+
+ChatItem *ChatScene::chatItemAt(const QPointF &scenePos) const {
+  QGraphicsItem *item = itemAt(scenePos);
+  return dynamic_cast<ChatItem *>(item);
+}
+
+bool ChatScene::containsBuffer(const BufferId &id) const {
+  MessageFilter *filter = qobject_cast<MessageFilter*>(model());
+  if(filter)
+    return filter->containsBuffer(id);
+  else
+    return false;
+}
+
 void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
   Q_UNUSED(index);
-//   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>();
+
+
+//   QModelIndex sidx = model()->index(start, 2);
+//   QModelIndex eidx = model()->index(end, 2);
+//   qDebug() << "rowsInserted:";
+//   if(start > 0) {
+//     QModelIndex ssidx = model()->index(start - 1, 2);
+//     qDebug() << "Start--:" << start - 1 << ssidx.data(MessageModel::MsgIdRole).value<MsgId>()
+//          << ssidx.data(Qt::DisplayRole).toString();
+//   }
+//   qDebug() << "Start:" << start << sidx.data(MessageModel::MsgIdRole).value<MsgId>()
+//        << sidx.data(Qt::DisplayRole).toString();
+//   qDebug() << "End:" << end << eidx.data(MessageModel::MsgIdRole).value<MsgId>()
+//        << eidx.data(Qt::DisplayRole).toString();
+//   if(end + 1 < model()->rowCount()) {
+//     QModelIndex eeidx = model()->index(end + 1, 2);
+//     qDebug() << "End++:" << end + 1 << eeidx.data(MessageModel::MsgIdRole).value<MsgId>()
+//          << eeidx.data(Qt::DisplayRole).toString();
+//   }
 
   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();
@@ -132,9 +182,9 @@ void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
   if(atTop) {
     for(int i = end; i >= start; i--) {
       ChatLine *line = new ChatLine(i, model(),
-                                   width,
-                                   timestampWidth, senderWidth, contentsWidth,
-                                   senderPos, contentsPos);
+                                    width,
+                                    timestampWidth, senderWidth, contentsWidth,
+                                    senderPos, contentsPos);
       h += line->height();
       line->setPos(0, y-h);
       _lines.insert(start, line);
@@ -143,9 +193,9 @@ void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
   } else {
     for(int i = start; i <= end; i++) {
       ChatLine *line = new ChatLine(i, model(),
-                                   width,
-                                   timestampWidth, senderWidth, contentsWidth,
-                                   senderPos, contentsPos);
+                                    width,
+                                    timestampWidth, senderWidth, contentsWidth,
+                                    senderPos, contentsPos);
       line->setPos(0, y+h);
       h += line->height();
       _lines.insert(i, line);
@@ -161,17 +211,24 @@ void ChatScene::rowsInserted(const QModelIndex &index, int start, int end) {
   // update selection
   if(_selectionStart >= 0) {
     int offset = end - start + 1;
-    if(_selectionStart >= start) _selectionStart += offset;
-    if(_selectionEnd >= start) _selectionEnd += offset;
-    if(_firstSelectionRow >= start) _firstSelectionRow += offset;
-    if(_lastSelectionRow >= start) _lastSelectionRow += offset;
+    int oldStart = _selectionStart;
+    if(_selectionStart >= start)
+      _selectionStart += offset;
+    if(_selectionEnd >= start) {
+      _selectionEnd += offset;
+      if(_selectionStart == oldStart)
+        for(int i = start; i < start + offset; i++)
+          _lines[i]->setSelected(true);
+    }
+    if(_firstSelectionRow >= start)
+      _firstSelectionRow += offset;
   }
 
   // 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) {
@@ -192,13 +249,31 @@ 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);
       for(int i = end + 1; i < prevFirstLineRow; i++) {
-       _lines.at(i)->show();
+        _lines.at(i)->show();
       }
     }
     // force new search for first proper line
@@ -219,6 +294,13 @@ void ChatScene::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int e
   bool atBottom = (end == _lines.count() - 1);
   bool moveTop = false;
 
+  // clear selection
+  if(_selectingItem) {
+    int row = _selectingItem->row();
+    if(row >= start && row <= end)
+      setSelectingItem(0);
+  }
+
   // remove items from scene
   QList<ChatLine *>::iterator lineIter = _lines.begin() + start;
   int lineCount = start;
@@ -238,13 +320,16 @@ void ChatScene::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int e
   if(_selectionStart >= 0) {
     int offset = end - start + 1;
     if(_selectionStart >= start)
-      _selectionStart -= offset;
+      _selectionStart = qMax(_selectionStart -= offset, start);
     if(_selectionEnd >= start)
       _selectionEnd -= offset;
     if(_firstSelectionRow >= start)
       _firstSelectionRow -= offset;
-    if(_lastSelectionRow >= start)
-      _lastSelectionRow -= offset;
+
+    if(_selectionEnd < _selectionStart) {
+      _isSelecting = false;
+      _selectionStart = -1;
+    }
   }
 
   // neither removing at bottom or top means we have to move items...
@@ -318,6 +403,7 @@ void ChatScene::setWidth(qreal width) {
 
   updateSceneRect(width);
   setHandleXLimits();
+  emit layoutChanged();
 
 //   clock_t endT = clock();
 //   qDebug() << "resized" << _lines.count() << "in" << (float)(endT - startT) / CLOCKS_PER_SEC << "sec";
@@ -385,7 +471,9 @@ void ChatScene::secondHandlePositionChanged(qreal xpos) {
   }
   //setItemIndexMethod(QGraphicsScene::BspTreeIndex);
 
+  updateSceneRect();
   setHandleXLimits();
+  emit layoutChanged();
 
 //   clock_t endT = clock();
 //   qDebug() << "resized" << _lines.count() << "in" << (float)(endT - startT) / CLOCKS_PER_SEC << "sec";
@@ -402,7 +490,7 @@ void ChatScene::setSelectingItem(ChatItem *item) {
 }
 
 void ChatScene::startGlobalSelection(ChatItem *item, const QPointF &itemPos) {
-  _selectionStart = _selectionEnd = _lastSelectionRow = _firstSelectionRow = item->row();
+  _selectionStart = _selectionEnd = _firstSelectionRow = item->row();
   _selectionStartCol = _selectionMinCol = item->column();
   _isSelecting = true;
   _lines[_selectionStart]->setSelected(true, (ChatLineModel::ColumnType)_selectionMinCol);
@@ -410,17 +498,9 @@ 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())));
-  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;
-  else curColumn = ChatLineModel::TimestampColumn;
-
+  int curRow = rowByScenePos(pos);
+  if(curRow < 0) return;
+  int curColumn = (int)columnByScenePos(pos);
   ChatLineModel::ColumnType minColumn = (ChatLineModel::ColumnType)qMin(curColumn, _selectionStartCol);
   if(minColumn != _selectionMinCol) {
     _selectionMinCol = minColumn;
@@ -449,97 +529,259 @@ void ChatScene::updateSelection(const QPointF &pos) {
 
   _selectionStart = newstart;
   _selectionEnd = newend;
-  _lastSelectionRow = curRow;
 
   if(newstart == newend && minColumn == ChatLineModel::ContentsColumn) {
     if(!_selectingItem) {
-      qWarning() << "WARNING: ChatScene::updateSelection() has a null _selectingItem, this should never happen! Please report.";
+      // _selectingItem has been removed already
       return;
     }
     _lines[curRow]->setSelected(false);
     _isSelecting = false;
+    _selectionStart = -1;
     _selectingItem->continueSelecting(_selectingItem->mapFromScene(pos));
   }
 }
 
-void ChatScene::mouseMoveEvent(QGraphicsSceneMouseEvent *event) {
-  if(_isSelecting && event->buttons() == Qt::LeftButton) {
-    updateSelection(event->scenePos());
-    event->accept();
+bool ChatScene::isPosOverSelection(const QPointF &pos) const {
+  ChatItem *chatItem = chatItemAt(pos);
+  if(!chatItem)
+    return false;
+  if(hasGlobalSelection()) {
+    int row = chatItem->row();
+    if(row >= qMin(_selectionStart, _selectionEnd) && row <= qMax(_selectionStart, _selectionEnd))
+      return columnByScenePos(pos) >= _selectionMinCol;
   } else {
-    QGraphicsScene::mouseMoveEvent(event);
+    return chatItem->isPosOverSelection(chatItem->mapFromScene(pos));
   }
+  return false;
+}
+
+bool ChatScene::isScrollingAllowed() const {
+  if(_isSelecting)
+    return false;
+
+  // TODO: Handle clicks and single-item selections too
+
+  return true;
+}
+
+/******** MOUSE HANDLING **************************************************************************/
+
+void ChatScene::contextMenuEvent(QGraphicsSceneContextMenuEvent *event) {
+  QPointF pos = event->scenePos();
+  QMenu menu;
+
+  // zoom actions and similar
+  chatView()->addActionsToMenu(&menu, pos);
+  menu.addSeparator();
+
+  if(isPosOverSelection(pos))
+    menu.addAction(SmallIcon("edit-copy"), tr("Copy Selection"),
+                    this, SLOT(selectionToClipboard()),
+                    QKeySequence::Copy);
+
+  // item-specific options (select link etc)
+  ChatItem *item = chatItemAt(pos);
+  if(item)
+    item->addActionsToMenu(&menu, item->mapFromScene(pos));
+  else
+    // no item -> default scene actions
+    Client::mainUi()->actionProvider()->addActions(&menu, filter(), BufferId());
+
+  menu.exec(event->screenPos());
+
+}
+
+void ChatScene::mouseMoveEvent(QGraphicsSceneMouseEvent *event) {
+  if(event->buttons() == Qt::LeftButton) {
+    if(!_clickHandled && (event->scenePos() - _clickPos).toPoint().manhattanLength() >= QApplication::startDragDistance()) {
+      if(_clickTimer.isActive())
+        _clickTimer.stop();
+      if(_clickMode == SingleClick && isPosOverSelection(_clickPos))
+        initiateDrag(event->widget());
+      else {
+        _clickMode = DragStartClick;
+        handleClick(Qt::LeftButton, _clickPos);
+      }
+      _clickMode = NoClick;
+    }
+    if(_isSelecting) {
+      updateSelection(event->scenePos());
+      emit mouseMoveWhileSelecting(event->scenePos());
+      event->accept();
+    } else if(_clickHandled && _clickMode < DoubleClick)
+      QGraphicsScene::mouseMoveEvent(event);
+  } else
+    QGraphicsScene::mouseMoveEvent(event);
 }
 
 void ChatScene::mousePressEvent(QGraphicsSceneMouseEvent *event) {
-  if(event->buttons() == Qt::LeftButton && _selectionStart >= 0) {
-    for(int l = qMin(_selectionStart, _selectionEnd); l <= qMax(_selectionStart, _selectionEnd); l++) {
-      _lines[l]->setSelected(false);
+  if(event->buttons() == Qt::LeftButton) {
+    _leftButtonPressed = true;
+    _clickHandled = false;
+    if(!isPosOverSelection(event->scenePos())) {
+      // immediately clear selection if clicked outside; otherwise, wait for potential drag
+      clearSelection();
     }
-    _selectionStart = -1;
-    QGraphicsScene::mousePressEvent(event);  // so we can start a new local selection
-  } else {
-    QGraphicsScene::mousePressEvent(event);
+    if(_clickMode != NoClick && _clickTimer.isActive()) {
+      switch(_clickMode) {
+        case NoClick: _clickMode = SingleClick; break;
+        case SingleClick: _clickMode = DoubleClick; break;
+        case DoubleClick: _clickMode = TripleClick; break;
+        case TripleClick: _clickMode = DoubleClick; break;
+        case DragStartClick: break;
+      }
+      handleClick(Qt::LeftButton, _clickPos);
+    } else {
+      _clickMode = SingleClick;
+      _clickPos = event->scenePos();
+    }
+    _clickTimer.start();
   }
+  if(event->type() == QEvent::GraphicsSceneMouseDoubleClick)
+    QGraphicsScene::mouseDoubleClickEvent(event);
+  else
+    QGraphicsScene::mousePressEvent(event);
+}
+
+void ChatScene::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event) {
+  // we check for doubleclick ourselves, so just call press handler
+  mousePressEvent(event);
 }
 
 void ChatScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) {
-  if(_isSelecting && !event->buttons() & Qt::LeftButton) {
-    putToClipboard(selectionToString());
-    _isSelecting = false;
-    event->accept();
-  } else {
-    QGraphicsScene::mouseReleaseEvent(event);
+  if(event->button() == Qt::LeftButton && _leftButtonPressed) {
+    _leftButtonPressed = false;
+    if(_clickMode != NoClick) {
+      if(_clickMode == SingleClick)
+        clearSelection();
+      event->accept();
+      if(!_clickTimer.isActive())
+        handleClick(Qt::LeftButton, _clickPos);
+    } else {
+      // no click -> drag or selection move
+      if(isGloballySelecting()) {
+        selectionToClipboard(QClipboard::Selection);
+        _isSelecting = false;
+        event->accept();
+        return;
+      }
+    }
   }
+  QGraphicsScene::mouseReleaseEvent(event);
 }
 
-void ChatScene::putToClipboard(const QString &selection) {
-  // TODO Configure clipboards
-#   ifdef Q_WS_X11
-  QApplication::clipboard()->setText(selection, QClipboard::Selection);
-#   endif
-//# else
-  QApplication::clipboard()->setText(selection);
-//# endif
+void ChatScene::clickTimeout() {
+  if(!_leftButtonPressed && _clickMode == SingleClick)
+    handleClick(Qt::LeftButton, _clickPos);
+}
+
+void ChatScene::handleClick(Qt::MouseButton button, const QPointF &scenePos) {
+  if(button == Qt::LeftButton) {
+    clearSelection();
+
+    // Now send click down to items
+    ChatItem *chatItem = chatItemAt(scenePos);
+    if(chatItem) {
+      chatItem->handleClick(chatItem->mapFromScene(scenePos), _clickMode);
+    }
+    _clickHandled = true;
+  }
+}
+
+void ChatScene::initiateDrag(QWidget *source) {
+  QDrag *drag = new QDrag(source);
+  QMimeData *mimeData = new QMimeData;
+  mimeData->setText(selection());
+  drag->setMimeData(mimeData);
+
+  drag->exec(Qt::CopyAction);
+}
+
+/******** SELECTIONS ******************************************************************************/
+
+void ChatScene::selectionToClipboard(QClipboard::Mode mode) {
+  if(!hasSelection())
+    return;
+
+  stringToClipboard(selection(), mode);
+}
+
+void ChatScene::stringToClipboard(const QString &str, QClipboard::Mode mode) {
+  switch(mode) {
+    case QClipboard::Clipboard:
+      QApplication::clipboard()->setText(str);
+      break;
+    case QClipboard::Selection:
+      if(QApplication::clipboard()->supportsSelection())
+        QApplication::clipboard()->setText(str, QClipboard::Selection);
+      break;
+    default:
+      break;
+  };
 }
 
 //!\brief Convert current selection to human-readable string.
-QString ChatScene::selectionToString() const {
+QString ChatScene::selection() const {
   //TODO Make selection format configurable!
-  if(!_isSelecting) return QString();
-  int start = qMin(_selectionStart, _selectionEnd);
-  int end = qMax(_selectionStart, _selectionEnd);
-  if(start < 0 || end >= _lines.count()) {
-    qDebug() << "Invalid selection range:" << start << end;
-    return QString();
-  }
-  QString result;
-  for(int l = start; l <= end; l++) {
-    if(_selectionMinCol == ChatLineModel::TimestampColumn)
-      result += _lines[l]->item(ChatLineModel::TimestampColumn).data(MessageModel::DisplayRole).toString() + " ";
-    if(_selectionMinCol <= ChatLineModel::SenderColumn)
-      result += _lines[l]->item(ChatLineModel::SenderColumn).data(MessageModel::DisplayRole).toString() + " ";
-    result += _lines[l]->item(ChatLineModel::ContentsColumn).data(MessageModel::DisplayRole).toString() + "\n";
+  if(hasGlobalSelection()) {
+    int start = qMin(_selectionStart, _selectionEnd);
+    int end = qMax(_selectionStart, _selectionEnd);
+    if(start < 0 || end >= _lines.count()) {
+      qDebug() << "Invalid selection range:" << start << end;
+      return QString();
+    }
+    QString result;
+    for(int l = start; l <= end; l++) {
+      if(_selectionMinCol == ChatLineModel::TimestampColumn)
+        result += _lines[l]->item(ChatLineModel::TimestampColumn).data(MessageModel::DisplayRole).toString() + " ";
+      if(_selectionMinCol <= ChatLineModel::SenderColumn)
+        result += _lines[l]->item(ChatLineModel::SenderColumn).data(MessageModel::DisplayRole).toString() + " ";
+      result += _lines[l]->item(ChatLineModel::ContentsColumn).data(MessageModel::DisplayRole).toString() + "\n";
+    }
+    return result;
+  } else if(selectingItem())
+    return selectingItem()->selection();
+  return QString();
+}
+
+bool ChatScene::hasSelection() const {
+  return hasGlobalSelection() || (selectingItem() && selectingItem()->hasSelection());
+}
+
+bool ChatScene::hasGlobalSelection() const {
+  return _selectionStart >= 0;
+}
+
+bool ChatScene::isGloballySelecting() const {
+  return _isSelecting;
+}
+
+void ChatScene::clearGlobalSelection() {
+  if(hasGlobalSelection()) {
+    for(int l = qMin(_selectionStart, _selectionEnd); l <= qMax(_selectionStart, _selectionEnd); l++)
+      _lines[l]->setSelected(false);
+    _isSelecting = false;
+    _selectionStart = -1;
   }
-  return result;
 }
 
+void ChatScene::clearSelection() {
+  clearGlobalSelection();
+  if(selectingItem())
+    selectingItem()->clearSelection();
+}
+
+/******** *************************************************************************************/
+
 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) {
+ChatLineModel::ColumnType ChatScene::columnByScenePos(qreal x) const {
   if(x < _firstColHandle->x())
     return ChatLineModel::TimestampColumn;
   if(x < _secondColHandle->x())
@@ -548,6 +790,15 @@ int ChatScene::sectionByScenePos(int x) {
   return ChatLineModel::ContentsColumn;
 }
 
+int ChatScene::rowByScenePos(qreal y) const {
+  // This is somewhat hacky... we look at the contents item that is at the given y position, since
+  // it has the full height. From this item, we can then determine the row index and hence the ChatLine.
+  // ChatItems cover their ChatLine, so we won't get to the latter directly.
+  ChatItem *contentItem = static_cast<ChatItem *>(itemAt(QPointF(_secondColHandle->sceneRight() + 1, y)));
+  if(!contentItem) return -1;
+  return contentItem->row();
+}
+
 void ChatScene::updateSceneRect(qreal width) {
   if(_lines.isEmpty()) {
     updateSceneRect(QRectF(0, 0, width, 0));
@@ -566,16 +817,21 @@ void ChatScene::updateSceneRect(qreal width) {
     while(_firstLineRow < numRows) {
       firstLineIdx = model()->index(_firstLineRow, 0);
       if((Message::Type)(model()->data(firstLineIdx, MessageModel::TypeRole).toInt()) != Message::DayChange)
-       break;
+        break;
       _lines.at(_firstLineRow)->hide();
       _firstLineRow++;
     }
   }
 
   // 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(), width, lastLine->pos().y() + lastLine->height() - firstLine->pos().y()));
+  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) {
@@ -584,81 +840,139 @@ void ChatScene::updateSceneRect(const QRectF &rect) {
   update();
 }
 
-void ChatScene::customEvent(QEvent *event) {
-  switch(event->type()) {
-  default:
-    return;
+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);
 }
 
+// ========================================
+//  Webkit Only stuff
+// ========================================
+#ifdef HAVE_WEBKIT
 void ChatScene::loadWebPreview(ChatItem *parentItem, const QString &url, const QRectF &urlRect) {
-#ifndef HAVE_WEBKIT
-  Q_UNUSED(parentItem)
-  Q_UNUSED(url)
-  Q_UNUSED(urlRect)
-#else
+  if(!_showWebPreview)
+    return;
+
+  if(webPreview.urlRect != urlRect)
+    webPreview.urlRect = urlRect;
+
   if(webPreview.parentItem != parentItem)
     webPreview.parentItem = parentItem;
 
   if(webPreview.url != url) {
     webPreview.url = url;
-    // load a new web view and delete the old one (if exists)
+    // prepare to load a different URL
     if(webPreview.previewItem && webPreview.previewItem->scene()) {
       removeItem(webPreview.previewItem);
       delete webPreview.previewItem;
+      webPreview.previewItem = 0;
     }
-    webPreview.previewItem = new WebPreviewItem(url);
-    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;
-    qreal previewY = urlRect.bottom();
-    qreal previewX = urlRect.x();
-    if(previewY + webPreview.previewItem->boundingRect().height() > sceneRect().bottom())
-      previewY = urlRect.y() - webPreview.previewItem->boundingRect().height();
+    webPreview.previewState = WebPreview::NoPreview;
+  }
 
-    if(previewX + webPreview.previewItem->boundingRect().width() > sceneRect().width())
-      previewX = sceneRect().right() - webPreview.previewItem->boundingRect().width();
+  if(webPreview.url.isEmpty())
+    return;
 
-    webPreview.previewItem->setPos(previewX, previewY);
-  }
-#endif
+  // qDebug() << Q_FUNC_INFO << webPreview.previewState;
+  switch(webPreview.previewState) {
+  case WebPreview::NoPreview:
+    webPreview.previewState = WebPreview::NewPreview;
+    webPreview.timer.start(500);
+    break;
+  case WebPreview::NewPreview:
+  case WebPreview::DelayPreview:
+  case WebPreview::ShowPreview:
+    // we're already waiting for the next step or showing the preview
+    break;
+  case WebPreview::HidePreview:
+    // we still have a valid preview
+    webPreview.previewState = WebPreview::DelayPreview;
+    webPreview.timer.start(1000);
+    break;
+  }
+  // qDebug() << "  new State:" << webPreview.previewState << webPreview.timer.isActive();
 }
 
-void ChatScene::showWebPreviewEvent() {
-#ifdef HAVE_WEBKIT
-  if(webPreview.previewItem)
+void ChatScene::webPreviewNextStep() {
+  // qDebug() << Q_FUNC_INFO << webPreview.previewState;
+  switch(webPreview.previewState) {
+  case WebPreview::NoPreview:
+    break;
+  case WebPreview::NewPreview:
+    Q_ASSERT(!webPreview.previewItem);
+    webPreview.previewItem = new WebPreviewItem(webPreview.url);
+    webPreview.previewState = WebPreview::DelayPreview;
+    webPreview.timer.start(1000);
+    break;
+  case WebPreview::DelayPreview:
+    Q_ASSERT(webPreview.previewItem);
+    // calc position and show
+    {
+      qreal previewY = webPreview.urlRect.bottom();
+      qreal previewX = webPreview.urlRect.x();
+      if(previewY + webPreview.previewItem->boundingRect().height() > sceneRect().bottom())
+       previewY = webPreview.urlRect.y() - webPreview.previewItem->boundingRect().height();
+
+      if(previewX + webPreview.previewItem->boundingRect().width() > sceneRect().width())
+       previewX = sceneRect().right() - webPreview.previewItem->boundingRect().width();
+
+      webPreview.previewItem->setPos(previewX, previewY);
+    }
     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 && webPreview.previewItem->scene()) {
+    webPreview.previewState = WebPreview::ShowPreview;
+    break;
+  case WebPreview::ShowPreview:
+    qWarning() << "ChatScene::webPreviewNextStep() called while in ShowPreview Step!";
+    qWarning() << "removing preview";
+    if(webPreview.previewItem && webPreview.previewItem->scene())
       removeItem(webPreview.previewItem);
-      webPreview.deleteTimer.start();
+    // Fall through to deletion!
+  case WebPreview::HidePreview:
+    if(webPreview.previewItem) {
+      delete webPreview.previewItem;
+      webPreview.previewItem = 0;
     }
-    webPreview.delayTimer.stop();
+    webPreview.parentItem = 0;
+    webPreview.url = QString();
+    webPreview.urlRect = QRectF();
+    webPreview.previewState = WebPreview::NoPreview;
   }
-#endif
+  // qDebug() << "  new State:" << webPreview.previewState << webPreview.timer.isActive();
 }
 
-void ChatScene::deleteWebPreviewEvent() {
-#ifdef HAVE_WEBKIT
-  if(webPreview.previewItem) {
-    delete webPreview.previewItem;
-    webPreview.previewItem = 0;
-  }
-  webPreview.parentItem = 0;
-  webPreview.url = QString();
-  webPreview.urlRect = QRectF();
+void ChatScene::clearWebPreview(ChatItem *parentItem) {
+  // qDebug() << Q_FUNC_INFO << webPreview.previewState;
+  switch(webPreview.previewState) {
+  case WebPreview::NewPreview:
+    webPreview.previewState = WebPreview::NoPreview; // we haven't loaded anything yet
+    break;
+  case WebPreview::ShowPreview:
+    if(parentItem == 0 || webPreview.parentItem == parentItem) {
+      if(webPreview.previewItem && webPreview.previewItem->scene())
+       removeItem(webPreview.previewItem);
+    }
+    // fall through into to set hidden state
+  case WebPreview::DelayPreview:
+    // we're just loading, so haven't shown the preview yet.
+    webPreview.previewState = WebPreview::HidePreview;
+    webPreview.timer.start(5000);
+    break;
+  case WebPreview::NoPreview:
+  case WebPreview::HidePreview:
+    break;
+  }
+  // qDebug() << "  new State:" << webPreview.previewState << webPreview.timer.isActive();
+}
 #endif
+
+// ========================================
+//  end of webkit only
+// ========================================
+
+void ChatScene::showWebPreviewChanged() {
+  ChatViewSettings settings;
+  _showWebPreview = settings.showWebPreview();
 }