src/qtui/chatview.cpp

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