src/qtui/chatview.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-08 by the Quassel Project                          *
   3  *   devel@quassel-irc.org                                                 *
   4  *                                                                         *
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  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
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  20
  21 #include <QGraphicsTextItem>
  22 #include <QScrollBar>
  23
  24 #include "chatlinemodelitem.h"
  25 #include "chatscene.h"
  26 #include "chatview.h"
  27 #include "client.h"
  28 #include "messagefilter.h"
  29 #include "quasselui.h"
  30
  31 ChatView::ChatView(BufferId bufferId, QWidget *parent)
  32   : QGraphicsView(parent),
  33     AbstractChatView()
  34 {
  35   QList<BufferId> filterList;
  36   filterList.append(bufferId);
  37   MessageFilter *filter = new MessageFilter(Client::messageModel(), filterList, this);
  38   init(filter);
  39 }
  40
  41 ChatView::ChatView(MessageFilter *filter, QWidget *parent)
  42   : QGraphicsView(parent),
  43     AbstractChatView()
  44 {
  45   init(filter);
  46 }
  47
  48 void ChatView::init(MessageFilter *filter) {
  49   setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  50   setAlignment(Qt::AlignBottom);
  51   setInteractive(true);
  52
  53   _scene = new ChatScene(filter, filter->idString(), this);
  54   connect(_scene, SIGNAL(heightChanged(qreal)), this, SLOT(sceneHeightChanged(qreal)));
  55   setScene(_scene);
  56
  57   connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
  58 }
  59
  60 void ChatView::resizeEvent(QResizeEvent *event) {
  61   scene()->setWidth(event->size().width() - 2);  // FIXME figure out why we have to hardcode the -2 here
  62   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
  63 }
  64
  65 void ChatView::sceneHeightChanged(qreal h) {
  66   Q_UNUSED(h)
  67   bool scrollable = qAbs(verticalScrollBar()->value() - verticalScrollBar()->maximum()) <= 2; // be a bit tolerant here, also FIXME (why we need this?)
  68   setSceneRect(scene()->sceneRect());
  69   if(scrollable) verticalScrollBar()->setValue(verticalScrollBar()->maximum());
  70 }
  71
  72 void ChatView::verticalScrollbarChanged(int newPos) {
  73   QAbstractSlider *vbar = verticalScrollBar();
  74   Q_ASSERT(vbar);
  75
  76   int relativePos = 100;
  77   if(vbar->maximum() - vbar->minimum() != 0)
  78     relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
  79
  80   if(relativePos < 20) {
  81     scene()->requestBacklog();
  82   }
  83 }
  84
  85 MsgId ChatView::lastMsgId() const {
  86   if(!scene())
  87     return MsgId();
  88
  89   QAbstractItemModel *model = scene()->model();
  90   if(!model || model->rowCount() == 0)
  91     return MsgId();
  92
  93   return model->data(model->index(model->rowCount() - 1, 0), MessageModel::MsgIdRole).value<MsgId>();
  94 }