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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   8  *   (at your option) version 3.                                           *
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  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
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  20
  21 #include <QGraphicsTextItem>
  22 #include <QScrollBar>
  23
  24 #include "buffer.h"
  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 {
  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 {
  46   init(filter);
  47 }
  48
  49 void ChatView::init(MessageFilter *filter) {
  50   setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  51   setAlignment(Qt::AlignBottom);
  52   setInteractive(true);
  53
  54   _scene = new ChatScene(filter, filter->idString(), this);
  55   connect(_scene, SIGNAL(heightChanged(qreal)), this, SLOT(sceneHeightChanged(qreal)));
  56   setScene(_scene);
  57
  58   connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
  59 }
  60
  61 void ChatView::resizeEvent(QResizeEvent *event) {
  62   scene()->setWidth(event->size().width() - 2);  // FIXME figure out why we have to hardcode the -2 here
  63   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
  64 }
  65
  66 void ChatView::sceneHeightChanged(qreal h) {
  67   Q_UNUSED(h)
  68   bool scrollable = qAbs(verticalScrollBar()->value() - verticalScrollBar()->maximum()) <= 2; // be a bit tolerant here, also FIXME (why we need this?)
  69   setSceneRect(scene()->sceneRect());
  70   if(scrollable) verticalScrollBar()->setValue(verticalScrollBar()->maximum());
  71 }
  72
  73 void ChatView::verticalScrollbarChanged(int newPos) {
  74   QAbstractSlider *vbar = verticalScrollBar();
  75   Q_ASSERT(vbar);
  76
  77   int relativePos = 100;
  78   if(vbar->maximum() - vbar->minimum() != 0)
  79     relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
  80
  81   if(relativePos < 20) {
  82     scene()->requestBacklog();
  83   }
  84 }
  85
  86 MsgId ChatView::lastMsgId() const {
  87   if(!scene())
  88     return MsgId();
  89
  90   QAbstractItemModel *model = scene()->model();
  91   if(!model || model->rowCount() == 0)
  92     return MsgId();
  93
  94   return model->data(model->index(model->rowCount() - 1, 0), MessageModel::MsgIdRole).value<MsgId>();
  95 }