src/qtui/chatview.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-08 by the Quassel Project                          *
   3  *   devel@quassel-irc.org                                                 *
   4  *                                                                         *
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   8  *   (at your option) version 3.                                           *
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  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
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  20
  21 #include <QApplication>
  22 #include <QGraphicsTextItem>
  23 #include <QScrollBar>
  24
  25 #include "chatlinemodelitem.h"
  26 #include "chatscene.h"
  27 #include "chatview.h"
  28 #include "client.h"
  29 #include "messagefilter.h"
  30 #include "quasselui.h"
  31
  32 ChatView::ChatView(BufferId bufferId, QWidget *parent)
  33   : QGraphicsView(parent),
  34     AbstractChatView(),
  35     _currentScaleFactor(1)
  36 {
  37   QList<BufferId> filterList;
  38   filterList.append(bufferId);
  39   MessageFilter *filter = new MessageFilter(Client::messageModel(), filterList, this);
  40   init(filter);
  41 }
  42
  43 ChatView::ChatView(MessageFilter *filter, QWidget *parent)
  44   : QGraphicsView(parent),
  45     AbstractChatView(),
  46     _currentScaleFactor(1)
  47 {
  48   init(filter);
  49 }
  50
  51 void ChatView::init(MessageFilter *filter) {
  52   setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  53   setAlignment(Qt::AlignBottom);
  54   setInteractive(true);
  55   //setOptimizationFlags(QGraphicsView::DontClipPainter | QGraphicsView::DontAdjustForAntialiasing);
  56   // setOptimizationFlags(QGraphicsView::DontAdjustForAntialiasing);
  57   setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
  58   // setTransformationAnchor(QGraphicsView::NoAnchor);
  59   setTransformationAnchor(QGraphicsView::AnchorViewCenter);
  60
  61   _scene = new ChatScene(filter, filter->idString(), viewport()->width() - 2, this); // see below: resizeEvent()
  62   connect(_scene, SIGNAL(sceneRectChanged(const QRectF &)), this, SLOT(sceneRectChanged(const QRectF &)));
  63   connect(_scene, SIGNAL(lastLineChanged(QGraphicsItem *, qreal)), this, SLOT(lastLineChanged(QGraphicsItem *, qreal)));
  64   setScene(_scene);
  65   // installEventFilter(_scene);
  66
  67   connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
  68 }
  69
  70 void ChatView::resizeEvent(QResizeEvent *event) {
  71   QGraphicsView::resizeEvent(event);
  72
  73   // we can reduce viewport updates if we scroll to the bottom allready at the beginning
  74   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
  75
  76   // FIXME: without the hardcoded -4 Qt reserves space for a horizontal scrollbar even though it's disabled permanently.
  77   // this does only occur on QtX11 (at least not on Qt for Mac OS). Seems like a Qt Bug.
  78   scene()->updateForViewport(viewport()->width() - 4, viewport()->height());
  79
  80   _lastScrollbarPos = verticalScrollBar()->maximum();
  81   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
  82 }
  83
  84 void ChatView::lastLineChanged(QGraphicsItem *chatLine, qreal offset) {
  85   Q_UNUSED(chatLine)
  86   QAbstractSlider *vbar = verticalScrollBar();
  87   Q_ASSERT(vbar);
  88   if(QApplication::mouseButtons() == Qt::NoButton
  89   && vbar->maximum() - vbar->value() <= (offset + 5) * _currentScaleFactor ) { // 5px grace area
  90     vbar->setValue(vbar->maximum());
  91   }
  92 }
  93
  94 void ChatView::verticalScrollbarChanged(int newPos) {
  95   QAbstractSlider *vbar = verticalScrollBar();
  96   Q_ASSERT(vbar);
  97
  98   // check for backlog request
  99   if(newPos < _lastScrollbarPos) {
 100     int relativePos = 100;
 101     if(vbar->maximum() - vbar->minimum() != 0)
 102       relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
 103
 104     if(relativePos < 20) {
 105       scene()->requestBacklog();
 106     }
 107   }
 108   _lastScrollbarPos = newPos;
 109 }
 110
 111 MsgId ChatView::lastMsgId() const {
 112   if(!scene())
 113     return MsgId();
 114
 115   QAbstractItemModel *model = scene()->model();
 116   if(!model || model->rowCount() == 0)
 117     return MsgId();
 118
 119   return model->data(model->index(model->rowCount() - 1, 0), MessageModel::MsgIdRole).value<MsgId>();
 120 }
 121
 122 void ChatView::zoomIn() {
 123     _currentScaleFactor *= 1.2;
 124     scale(1.2, 1.2);
 125     scene()->setWidth(viewport()->width() / _currentScaleFactor - 2);
 126 }
 127
 128 void ChatView::zoomOut() {
 129     _currentScaleFactor /= 1.2;
 130     scale(1 / 1.2, 1 / 1.2);
 131     scene()->setWidth(viewport()->width() / _currentScaleFactor - 2);
 132 }
 133
 134 void ChatView::zoomNormal() {
 135     scale(1/_currentScaleFactor, 1/_currentScaleFactor);
 136     _currentScaleFactor = 1;
 137     scene()->setWidth(viewport()->width() - 2);
 138 }