X-Git-Url: https://git.quassel-irc.org/?p=quassel.git;a=blobdiff_plain;f=src%2Fuisupport%2Fbufferviewfilter.cpp;h=6bd65653e5f5757d2d15fd9cec1a3c8ef60bb238;hp=b8a1975c8314c4b4be2aefaadb44a28d392f4d6e;hb=6daace85c6e97db23d0ab946f59479db20defb63;hpb=e733408e4759473bf38831f498f48a0f2f5e6dc7

diff --git a/src/uisupport/bufferviewfilter.cpp b/src/uisupport/bufferviewfilter.cpp
index b8a1975c..6bd65653 100644
--- a/src/uisupport/bufferviewfilter.cpp
+++ b/src/uisupport/bufferviewfilter.cpp
@@ -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  *
@@ -20,162 +20,514 @@
 
 #include "bufferviewfilter.h"
 
-#include <QColor>
+#include <QApplication>
+#include <QPalette>
+#include <QBrush>
 
+#include "bufferinfo.h"
+#include "buffermodel.h"
+#include "buffersettings.h"
+#include "client.h"
+#include "clientbufferviewconfig.h"
+#include "graphicalui.h"
+#include "iconloader.h"
 #include "networkmodel.h"
+#include "uistyle.h"
+
+class CheckRemovalEvent : public QEvent {
+public:
+  CheckRemovalEvent(const QModelIndex &source_index) : QEvent(QEvent::User), index(source_index) {};
+  QPersistentModelIndex index;
+};
 
 /*****************************************
 * The Filter for the Tree View
 *****************************************/
-BufferViewFilter::BufferViewFilter(QAbstractItemModel *model, const Modes &filtermode, const QList<NetworkId> &nets)
+BufferViewFilter::BufferViewFilter(QAbstractItemModel *model, BufferViewConfig *config)
   : QSortFilterProxyModel(model),
-    mode(filtermode),
-    networks(QSet<NetworkId>::fromList(nets))
+    _config(0),
+    _sortOrder(Qt::AscendingOrder),
+    _showServerQueries(false),
+    _editMode(false),
+    _enableEditMode(tr("Show / Hide Chats"), this)
 {
+  setConfig(config);
   setSourceModel(model);
-  setSortCaseSensitivity(Qt::CaseInsensitive);
 
-  // FIXME
-  // ok the following basically sucks. therfore it's commented out. Justice served.
-  // a better solution would use dataChanged()
-  
-  // I have this feeling that this resulted in a fuckup once... no clue though right now and invalidateFilter isn't a slot -.-
-  //connect(model, SIGNAL(invalidateFilter()), this, SLOT(invalidate()));
-  // connect(model, SIGNAL(invalidateFilter()), this, SLOT(invalidateFilter_()));
+  setDynamicSortFilter(true);
+
+  connect(this, SIGNAL(_dataChanged(const QModelIndex &, const QModelIndex &)),
+	  this, SLOT(_q_sourceDataChanged(QModelIndex,QModelIndex)));
+
+  _enableEditMode.setCheckable(true);
+  _enableEditMode.setChecked(_editMode);
+  connect(&_enableEditMode, SIGNAL(toggled(bool)), this, SLOT(enableEditMode(bool)));
+
+  BufferSettings defaultSettings;
+  defaultSettings.notify("ServerNoticesTarget", this, SLOT(showServerQueriesChanged()));
+  showServerQueriesChanged();
+}
+
+void BufferViewFilter::setConfig(BufferViewConfig *config) {
+  if(_config == config)
+    return;
+
+  if(_config) {
+    disconnect(_config, 0, this, 0);
+  }
+
+  _config = config;
+
+  if(!config) {
+    invalidate();
+    setObjectName("");
+    return;
+  }
+
+  if(config->isInitialized()) {
+    configInitialized();
+  } else {
+    // we use a queued connection here since manipulating the connection list of a sending object
+    // doesn't seem to be such a good idea while executing a connected slots.
+    connect(config, SIGNAL(initDone()), this, SLOT(configInitialized()), Qt::QueuedConnection);
+    invalidate();
+  }
+}
+
+void BufferViewFilter::configInitialized() {
+  if(!config())
+    return;
+
+//   connect(config(), SIGNAL(bufferViewNameSet(const QString &)), this, SLOT(invalidate()));
+  connect(config(), SIGNAL(configChanged()), this, SLOT(invalidate()));
+//   connect(config(), SIGNAL(networkIdSet(const NetworkId &)), this, SLOT(invalidate()));
+//   connect(config(), SIGNAL(addNewBuffersAutomaticallySet(bool)), this, SLOT(invalidate()));
+//   connect(config(), SIGNAL(sortAlphabeticallySet(bool)), this, SLOT(invalidate()));
+//   connect(config(), SIGNAL(hideInactiveBuffersSet(bool)), this, SLOT(invalidate()));
+//   connect(config(), SIGNAL(allowedBufferTypesSet(int)), this, SLOT(invalidate()));
+//   connect(config(), SIGNAL(minimumActivitySet(int)), this, SLOT(invalidate()));
+//   connect(config(), SIGNAL(bufferListSet()), this, SLOT(invalidate()));
+//   connect(config(), SIGNAL(bufferAdded(const BufferId &, int)), this, SLOT(invalidate()));
+//   connect(config(), SIGNAL(bufferMoved(const BufferId &, int)), this, SLOT(invalidate()));
+//   connect(config(), SIGNAL(bufferRemoved(const BufferId &)), this, SLOT(invalidate()));
+//   connect(config(), SIGNAL(bufferPermanentlyRemoved(const BufferId &)), this, SLOT(invalidate()));
+
+  disconnect(config(), SIGNAL(initDone()), this, SLOT(configInitialized()));
+
+  setObjectName(config()->bufferViewName());
+
+  invalidate();
+  emit configChanged();
+}
+
+void BufferViewFilter::showServerQueriesChanged() {
+  BufferSettings bufferSettings;
+
+  bool showQueries = (bufferSettings.serverNoticesTarget() & BufferSettings::DefaultBuffer);
+  if(_showServerQueries != showQueries) {
+    _showServerQueries = showQueries;
+    invalidate();
+  }
 }
 
-void BufferViewFilter::invalidateFilter_() {
-  QSortFilterProxyModel::invalidateFilter();
+QList<QAction *> BufferViewFilter::actions(const QModelIndex &index) {
+  Q_UNUSED(index)
+  QList<QAction *> actionList;
+  actionList << &_enableEditMode;
+  return actionList;
 }
 
+void BufferViewFilter::enableEditMode(bool enable) {
+  if(_editMode == enable) {
+    return;
+  }
+  _editMode = enable;
+
+  if(!config())
+    return;
+
+  if(enable == false) {
+    addBuffers(QList<BufferId>::fromSet(_toAdd));
+    QSet<BufferId>::const_iterator iter;
+    for(iter = _toTempRemove.constBegin(); iter != _toTempRemove.constEnd(); iter++) {
+      if(config()->temporarilyRemovedBuffers().contains(*iter))
+	 continue;
+      config()->requestRemoveBuffer(*iter);
+    }
+    for(iter = _toRemove.constBegin(); iter != _toRemove.constEnd(); iter++) {
+      if(config()->removedBuffers().contains(*iter))
+	 continue;
+      config()->requestRemoveBufferPermanently(*iter);
+    }
+  }
+  _toAdd.clear();
+  _toTempRemove.clear();
+  _toRemove.clear();
+
+  invalidate();
+}
+
+
 Qt::ItemFlags BufferViewFilter::flags(const QModelIndex &index) const {
-  Qt::ItemFlags flags = mapToSource(index).flags();
-  if(mode & FullCustom) {
-    if(index == QModelIndex() || index.parent() == QModelIndex())
+  QModelIndex source_index = mapToSource(index);
+  Qt::ItemFlags flags = sourceModel()->flags(source_index);
+  if(config()) {
+    NetworkModel::ItemType itemType = (NetworkModel::ItemType)sourceModel()->data(source_index, NetworkModel::ItemTypeRole).toInt();
+    BufferInfo::Type bufferType = (BufferInfo::Type)sourceModel()->data(source_index, NetworkModel::BufferTypeRole).toInt();
+    if(source_index == QModelIndex() || itemType == NetworkModel::NetworkItemType) {
       flags |= Qt::ItemIsDropEnabled;
+    } else if(_editMode) {
+      flags |= Qt::ItemIsUserCheckable | Qt::ItemIsTristate;
+    }
+
+    // prohibit dragging of most items. and most drop places
+    // only query to query is allowed for merging
+    if(bufferType != BufferInfo::QueryBuffer) {
+      ClientBufferViewConfig *clientConf = qobject_cast<ClientBufferViewConfig *>(config());
+      if(clientConf && clientConf->isLocked()) {
+	flags &= ~(Qt::ItemIsDropEnabled | Qt::ItemIsDragEnabled);
+      }
+    }
   }
   return flags;
 }
 
 bool BufferViewFilter::dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) {
-  // drops have to occur in the open field
-  if(parent != QModelIndex())
+  if(!config() || !NetworkModel::mimeContainsBufferList(data))
     return QSortFilterProxyModel::dropMimeData(data, action, row, column, parent);
 
-  if(!NetworkModel::mimeContainsBufferList(data))
-    return false;
+  NetworkId droppedNetworkId;
+  QModelIndex source_parent = mapToSource(parent);
+  if(sourceModel()->data(source_parent, NetworkModel::ItemTypeRole) == NetworkModel::NetworkItemType)
+    droppedNetworkId = sourceModel()->data(source_parent, NetworkModel::NetworkIdRole).value<NetworkId>();
 
   QList< QPair<NetworkId, BufferId> > bufferList = NetworkModel::mimeDataToBufferList(data);
-
-  NetworkId netId;
   BufferId bufferId;
+  NetworkId networkId;
+  int pos;
   for(int i = 0; i < bufferList.count(); i++) {
-    netId = bufferList[i].first;
+    networkId = bufferList[i].first;
     bufferId = bufferList[i].second;
-    if(!networks.contains(netId)) {
-      networks << netId;
+    if(droppedNetworkId == networkId) {
+      if(row < 0)
+	row = 0;
+
+      if(row < rowCount(parent)) {
+	QModelIndex source_child = mapToSource(index(row, 0, parent));
+	BufferId beforeBufferId = sourceModel()->data(source_child, NetworkModel::BufferIdRole).value<BufferId>();
+	pos = config()->bufferList().indexOf(beforeBufferId);
+	if(_sortOrder == Qt::DescendingOrder)
+	  pos++;
+      } else {
+	if(_sortOrder == Qt::AscendingOrder)
+	  pos = config()->bufferList().count();
+	else
+	  pos = 0;
+      }
+
+      if(config()->bufferList().contains(bufferId) && !config()->sortAlphabetically()) {
+	if(config()->bufferList().indexOf(bufferId) < pos)
+	  pos--;
+	ClientBufferViewConfig *clientConf = qobject_cast<ClientBufferViewConfig *>(config());
+	if(!clientConf || !clientConf->isLocked())
+	  config()->requestMoveBuffer(bufferId, pos);
+      } else {
+	config()->requestAddBuffer(bufferId, pos);
+      }
+
+    } else {
+      addBuffer(bufferId);
     }
-    addBuffer(bufferId);
   }
   return true;
 }
 
-void BufferViewFilter::addBuffer(const BufferId &bufferuid) {
-  if(!buffers.contains(bufferuid)) {
-    buffers << bufferuid;
-    invalidateFilter();
-  }
+void BufferViewFilter::sort(int column, Qt::SortOrder order) {
+  _sortOrder = order;
+  QSortFilterProxyModel::sort(column, order);
 }
 
-void BufferViewFilter::removeBuffer(const QModelIndex &index) {
-  if(!(mode & FullCustom))
-    return; // only custom buffers can be customized... obviously... :)
-  
-  if(index.parent() == QModelIndex())
-    return; // only child elements can be deleted
+void BufferViewFilter::addBuffer(const BufferId &bufferId) const {
+  if(!config() || config()->bufferList().contains(bufferId))
+    return;
 
-  bool lastBuffer = (rowCount(index.parent()) == 1);
-  NetworkId netId = index.data(NetworkModel::NetworkIdRole).value<NetworkId>();
-  BufferId bufferuid = index.data(NetworkModel::BufferIdRole).value<BufferId>();
+  int pos = config()->bufferList().count();
+  bool lt;
+  for(int i = 0; i < config()->bufferList().count(); i++) {
+    if(config() && config()->sortAlphabetically())
+      lt = bufferIdLessThan(bufferId, config()->bufferList()[i]);
+    else
+      lt = bufferId < config()->bufferList()[i];
 
-  if(buffers.contains(bufferuid)) {
-    buffers.remove(bufferuid);
-    
-    if(lastBuffer) {
-      networks.remove(netId);
-      Q_ASSERT(!networks.contains(netId));
+    if(lt) {
+      pos = i;
+      break;
     }
-
-    invalidateFilter();
   }
-  
+  config()->requestAddBuffer(bufferId, pos);
 }
 
+void BufferViewFilter::addBuffers(const QList<BufferId> &bufferIds) const {
+  if(!config())
+    return;
+
+  QList<BufferId> bufferList = config()->bufferList();
+  foreach(BufferId bufferId, bufferIds) {
+    if(bufferList.contains(bufferId))
+      continue;
+
+    int pos = bufferList.count();
+    bool lt;
+    for(int i = 0; i < bufferList.count(); i++) {
+      if(config() && config()->sortAlphabetically())
+	lt = bufferIdLessThan(bufferId, bufferList[i]);
+      else
+	lt = bufferId < config()->bufferList()[i];
+
+      if(lt) {
+	pos = i;
+	bufferList.insert(pos, bufferId);
+	break;
+      }
+    }
+    config()->requestAddBuffer(bufferId, pos);
+  }
+}
 
 bool BufferViewFilter::filterAcceptBuffer(const QModelIndex &source_bufferIndex) const {
-  BufferItem::Type bufferType = (BufferItem::Type) source_bufferIndex.data(NetworkModel::BufferTypeRole).toInt();
-  
-  if((mode & NoChannels) && bufferType == BufferItem::ChannelType)
-    return false;
-  if((mode & NoQueries) && bufferType == BufferItem::QueryType)
+  // no config -> "all buffers" -> accept everything
+  if(!config())
+    return true;
+
+  BufferId bufferId = sourceModel()->data(source_bufferIndex, NetworkModel::BufferIdRole).value<BufferId>();
+  Q_ASSERT(bufferId.isValid());
+
+  int activityLevel = sourceModel()->data(source_bufferIndex, NetworkModel::BufferActivityRole).toInt();
+
+  if(!config()->bufferList().contains(bufferId) && !_editMode) {
+    // add the buffer if...
+    if(config()->isInitialized()
+       && !config()->removedBuffers().contains(bufferId) // it hasn't been manually removed and either
+       && ((config()->addNewBuffersAutomatically() && !config()->temporarilyRemovedBuffers().contains(bufferId)) // is totally unknown to us (a new buffer)...
+	   || (config()->temporarilyRemovedBuffers().contains(bufferId) && activityLevel > BufferInfo::OtherActivity))) { // or was just temporarily hidden and has a new message waiting for us.
+      addBuffer(bufferId);
+    }
+    // note: adding the buffer to the valid list does not temper with the following filters ("show only channels" and stuff)
     return false;
-  if((mode & NoServers) && bufferType == BufferItem::StatusType)
+  }
+
+  if(config()->networkId().isValid() && config()->networkId() != sourceModel()->data(source_bufferIndex, NetworkModel::NetworkIdRole).value<NetworkId>())
     return false;
 
-//   bool isActive = source_bufferIndex.data(NetworkModel::BufferActiveRole).toBool();
-//   if((mode & NoActive) && isActive)
-//     return false;
-//   if((mode & NoInactive) && !isActive)
-//     return false;
+  int allowedBufferTypes = config()->allowedBufferTypes();
+  if(!config()->networkId().isValid())
+    allowedBufferTypes &= ~BufferInfo::StatusBuffer;
+  int bufferType = sourceModel()->data(source_bufferIndex, NetworkModel::BufferTypeRole).toInt();
+  if(!(allowedBufferTypes & bufferType))
+    return false;
 
-  if((mode & FullCustom)) {
-    BufferId bufferuid = source_bufferIndex.data(NetworkModel::BufferIdRole).value<BufferId>();
-    return buffers.contains(bufferuid);
+  if(bufferType & BufferInfo::QueryBuffer && !_showServerQueries && sourceModel()->data(source_bufferIndex, Qt::DisplayRole).toString().contains('.')) {
+    return false;
   }
-    
+
+  // the following dynamic filters may not trigger if the buffer is currently selected.
+  QModelIndex currentIndex = Client::bufferModel()->standardSelectionModel()->currentIndex();
+  if(bufferId == Client::bufferModel()->data(currentIndex, NetworkModel::BufferIdRole).value<BufferId>())
+    return true;
+
+  if(config()->hideInactiveBuffers() && !sourceModel()->data(source_bufferIndex, NetworkModel::ItemActiveRole).toBool() && activityLevel <= BufferInfo::OtherActivity)
+    return false;
+
+  if(config()->minimumActivity() > activityLevel)
+    return false;
+
   return true;
 }
 
 bool BufferViewFilter::filterAcceptNetwork(const QModelIndex &source_index) const {
-  NetworkId net = source_index.data(NetworkModel::NetworkIdRole).value<NetworkId>();
-  return !((mode & (SomeNets | FullCustom)) && !networks.contains(net));
+  if(!config())
+    return true;
+
+  if(!config()->networkId().isValid()) {
+    return true;
+  } else {
+    return config()->networkId() == sourceModel()->data(source_index, NetworkModel::NetworkIdRole).value<NetworkId>();
+  }
 }
 
 bool BufferViewFilter::filterAcceptsRow(int source_row, const QModelIndex &source_parent) const {
   QModelIndex child = sourceModel()->index(source_row, 0, source_parent);
-  
+
   if(!child.isValid()) {
-    qDebug() << "filterAcceptsRow has been called with an invalid Child";
+    qWarning() << "filterAcceptsRow has been called with an invalid Child";
     return false;
   }
 
-  if(source_parent == QModelIndex())
+  NetworkModel::ItemType childType = (NetworkModel::ItemType)sourceModel()->data(child, NetworkModel::ItemTypeRole).toInt();
+  switch(childType) {
+  case NetworkModel::NetworkItemType:
     return filterAcceptNetwork(child);
-  else
+  case NetworkModel::BufferItemType:
     return filterAcceptBuffer(child);
+  default:
+    return false;
+  }
 }
 
-bool BufferViewFilter::lessThan(const QModelIndex &left, const QModelIndex &right) const {
-  int lefttype = left.data(NetworkModel::BufferTypeRole).toInt();
-  int righttype = right.data(NetworkModel::BufferTypeRole).toInt();
+bool BufferViewFilter::lessThan(const QModelIndex &source_left, const QModelIndex &source_right) const {
+  int leftItemType = sourceModel()->data(source_left, NetworkModel::ItemTypeRole).toInt();
+  int rightItemType = sourceModel()->data(source_right, NetworkModel::ItemTypeRole).toInt();
+  int itemType = leftItemType & rightItemType;
+  switch(itemType) {
+  case NetworkModel::NetworkItemType:
+    return networkLessThan(source_left, source_right);
+  case NetworkModel::BufferItemType:
+    return bufferLessThan(source_left, source_right);
+  default:
+    return QSortFilterProxyModel::lessThan(source_left, source_right);
+  }
+}
 
-  if(lefttype != righttype)
-    return lefttype < righttype;
-  else
-    return QSortFilterProxyModel::lessThan(left, right);
+bool BufferViewFilter::bufferLessThan(const QModelIndex &source_left, const QModelIndex &source_right) const {
+  BufferId leftBufferId = sourceModel()->data(source_left, NetworkModel::BufferIdRole).value<BufferId>();
+  BufferId rightBufferId = sourceModel()->data(source_right, NetworkModel::BufferIdRole).value<BufferId>();
+  if(config()) {
+    int leftPos = config()->bufferList().indexOf(leftBufferId);
+    int rightPos = config()->bufferList().indexOf(rightBufferId);
+    if(leftPos == -1 && rightPos == -1)
+      return QSortFilterProxyModel::lessThan(source_left, source_right);
+    if(leftPos == -1 || rightPos == -1)
+      return !(leftPos < rightPos);
+    return leftPos < rightPos;
+  } else
+    return bufferIdLessThan(leftBufferId, rightBufferId);
+}
+
+bool BufferViewFilter::networkLessThan(const QModelIndex &source_left, const QModelIndex &source_right) const {
+  NetworkId leftNetworkId = sourceModel()->data(source_left, NetworkModel::NetworkIdRole).value<NetworkId>();
+  NetworkId rightNetworkId = sourceModel()->data(source_right, NetworkModel::NetworkIdRole).value<NetworkId>();
+
+  return QSortFilterProxyModel::lessThan(source_left, source_right);
 }
 
 QVariant BufferViewFilter::data(const QModelIndex &index, int role) const {
-  if(role == Qt::ForegroundRole)
-    return foreground(index);
-  else
+  switch(role) {
+  case Qt::FontRole:
+  case Qt::ForegroundRole:
+  case Qt::BackgroundRole:
+  case Qt::DecorationRole:
+    if((config() && config()->disableDecoration()))
+      return QVariant();
+    return GraphicalUi::uiStyle()->bufferViewItemData(mapToSource(index), role);
+  case Qt::CheckStateRole:
+    return checkedState(index);
+  default:
     return QSortFilterProxyModel::data(index, role);
+  }
 }
 
-QVariant BufferViewFilter::foreground(const QModelIndex &index) const {
-  if(!index.data(NetworkModel::ItemActiveRole).toBool())
-    return QColor(Qt::gray);
+QVariant BufferViewFilter::checkedState(const QModelIndex &index) const {
+  if(!_editMode || !config())
+    return QVariant();
+
+  QModelIndex source_index = mapToSource(index);
+  if(source_index == QModelIndex() || sourceModel()->data(source_index, NetworkModel::ItemTypeRole) == NetworkModel::NetworkItemType)
+    return QVariant();
+
+  BufferId bufferId = sourceModel()->data(source_index, NetworkModel::BufferIdRole).value<BufferId>();
+  if(_toAdd.contains(bufferId))
+    return Qt::Checked;
+
+  if(_toTempRemove.contains(bufferId))
+    return Qt::PartiallyChecked;
+
+  if(_toRemove.contains(bufferId))
+    return Qt::Unchecked;
+
+  if(config()->bufferList().contains(bufferId))
+    return Qt::Checked;
 
-  // FIXME:: show colors depending on activity level
-  return QColor(Qt::black);
+  if(config()->temporarilyRemovedBuffers().contains(bufferId))
+    return Qt::PartiallyChecked;
+
+  return Qt::Unchecked;
+}
+
+bool BufferViewFilter::setData(const QModelIndex &index, const QVariant &value, int role) {
+  switch(role) {
+  case Qt::CheckStateRole:
+    return setCheckedState(index, Qt::CheckState(value.toInt()));
+  default:
+    return QSortFilterProxyModel::setData(index, value, role);
+  }
+}
+
+bool BufferViewFilter::setCheckedState(const QModelIndex &index, Qt::CheckState state) {
+  QModelIndex source_index = mapToSource(index);
+  BufferId bufferId = sourceModel()->data(source_index, NetworkModel::BufferIdRole).value<BufferId>();
+  if(!bufferId.isValid())
+    return false;
+
+  switch(state) {
+  case Qt::Unchecked:
+    _toAdd.remove(bufferId);
+    _toTempRemove.remove(bufferId);
+    _toRemove << bufferId;
+    break;
+  case Qt::PartiallyChecked:
+    _toAdd.remove(bufferId);
+    _toTempRemove << bufferId;
+    _toRemove.remove(bufferId);
+    break;
+  case Qt::Checked:
+    _toAdd << bufferId;
+    _toTempRemove.remove(bufferId);
+    _toRemove.remove(bufferId);
+    break;
+  default:
+    return false;
+  }
+  emit dataChanged(index, index);
+  return true;
 }
+
+void BufferViewFilter::checkPreviousCurrentForRemoval(const QModelIndex &current, const QModelIndex &previous) {
+  Q_UNUSED(current);
+  if(previous.isValid())
+    QCoreApplication::postEvent(this, new CheckRemovalEvent(previous));
+}
+
+void BufferViewFilter::customEvent(QEvent *event) {
+  if(event->type() != QEvent::User)
+    return;
+
+  CheckRemovalEvent *removalEvent = static_cast<CheckRemovalEvent *>(event);
+  checkItemForRemoval(removalEvent->index);
+
+  event->accept();
+}
+
+void BufferViewFilter::checkItemsForRemoval(const QModelIndex &topLeft, const QModelIndex &bottomRight) {
+  QModelIndex source_topLeft = mapToSource(topLeft);
+  QModelIndex source_bottomRight = mapToSource(bottomRight);
+  emit _dataChanged(source_topLeft, source_bottomRight);
+}
+
+bool BufferViewFilter::bufferIdLessThan(const BufferId &left, const BufferId &right) {
+  Q_CHECK_PTR(Client::networkModel());
+  if(!Client::networkModel())
+    return true;
+
+  QModelIndex leftIndex = Client::networkModel()->bufferIndex(left);
+  QModelIndex rightIndex = Client::networkModel()->bufferIndex(right);
+
+  int leftType = Client::networkModel()->data(leftIndex, NetworkModel::BufferTypeRole).toInt();
+  int rightType = Client::networkModel()->data(rightIndex, NetworkModel::BufferTypeRole).toInt();
+
+  if(leftType != rightType)
+    return leftType < rightType;
+  else
+    return QString::compare(Client::networkModel()->data(leftIndex, Qt::DisplayRole).toString(), Client::networkModel()->data(rightIndex, Qt::DisplayRole).toString(), Qt::CaseInsensitive) < 0;
+}
+
+