src/qtui/chatview.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-08 by the Quassel Project                          *
   3  *   devel@quassel-irc.org                                                 *
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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   //setOptimizationFlags(QGraphicsView::DontClipPainter | QGraphicsView::DontAdjustForAntialiasing);
  53   // setOptimizationFlags(QGraphicsView::DontAdjustForAntialiasing);
  54   setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
  55   setTransformationAnchor(QGraphicsView::NoAnchor);
  56
  57   _scene = new ChatScene(filter, filter->idString(), viewport()->width() - 2, this); // see below: resizeEvent()
  58   connect(_scene, SIGNAL(sceneRectChanged(const QRectF &)), this, SLOT(sceneRectChanged(const QRectF &)));
  59   connect(_scene, SIGNAL(lastLineChanged(QGraphicsItem *, qreal)), this, SLOT(lastLineChanged(QGraphicsItem *, qreal)));
  60   setScene(_scene);
  61   // installEventFilter(_scene);
  62
  63   connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
  64 }
  65
  66 void ChatView::resizeEvent(QResizeEvent *event) {
  67   QGraphicsView::resizeEvent(event);
  68
  69   // we can reduce viewport updates if we scroll to the bottom allready at the beginning
  70   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
  71
  72   // FIXME: without the hardcoded -4 Qt reserves space for a horizontal scrollbar even though it's disabled permanently.
  73   // this does only occur on QtX11 (at least not on Qt for Mac OS). Seems like a Qt Bug.
  74   scene()->updateForViewport(viewport()->width() - 4, viewport()->height());
  75
  76   _lastScrollbarPos = verticalScrollBar()->maximum();
  77   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
  78 }
  79
  80 void ChatView::lastLineChanged(QGraphicsItem *chatLine, qreal offset) {
  81   Q_UNUSED(chatLine)
  82   QAbstractSlider *vbar = verticalScrollBar();
  83   Q_ASSERT(vbar);
  84   if(vbar->maximum() - vbar->value() <= offset + 5) { // 5px grace area
  85     vbar->setValue(vbar->maximum());
  86   }
  87 }
  88
  89 void ChatView::verticalScrollbarChanged(int newPos) {
  90   QAbstractSlider *vbar = verticalScrollBar();
  91   Q_ASSERT(vbar);
  92
  93   // check for backlog request
  94   if(newPos < _lastScrollbarPos) {
  95     int relativePos = 100;
  96     if(vbar->maximum() - vbar->minimum() != 0)
  97       relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
  98
  99     if(relativePos < 20) {
 100       scene()->requestBacklog();
 101     }
 102   }
 103   _lastScrollbarPos = newPos;
 104 }
 105
 106 MsgId ChatView::lastMsgId() const {
 107   if(!scene())
 108     return MsgId();
 109
 110   QAbstractItemModel *model = scene()->model();
 111   if(!model || model->rowCount() == 0)
 112     return MsgId();
 113
 114   return model->data(model->index(model->rowCount() - 1, 0), MessageModel::MsgIdRole).value<MsgId>();
 115 }