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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   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) version 3.                                           *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
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  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
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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
  43 ChatView::ChatView(MessageFilter *filter, QWidget *parent)
  44   : QGraphicsView(parent),
  45     AbstractChatView()
  46 {
  47   init(filter);
  48 }
  49
  50 void ChatView::init(MessageFilter *filter) {
  51   setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  52   setAlignment(Qt::AlignBottom);
  53   setInteractive(true);
  54
  55   _scene = new ChatScene(filter, filter->idString(), this);
  56   connect(_scene, SIGNAL(heightChanged(qreal)), this, SLOT(sceneHeightChanged(qreal)));
  57   setScene(_scene);
  58
  59   connect(verticalScrollBar(), SIGNAL(sliderPressed()), this, SLOT(sliderPressed()));
  60   connect(verticalScrollBar(), SIGNAL(sliderReleased()), this, SLOT(sliderReleased()));
  61   connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
  62 }
  63
  64 void ChatView::resizeEvent(QResizeEvent *event) {
  65   scene()->setWidth(event->size().width() - 2);  // FIXME figure out why we have to hardcode the -2 here
  66   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
  67 }
  68
  69 void ChatView::sceneHeightChanged(qreal h) {
  70   Q_UNUSED(h)
  71   bool scrollable = qAbs(verticalScrollBar()->value() - verticalScrollBar()->maximum()) <= 2; // be a bit tolerant here, also FIXME (why we need this?)
  72   setSceneRect(scene()->sceneRect());
  73   if(scrollable) verticalScrollBar()->setValue(verticalScrollBar()->maximum());
  74 }
  75
  76 void ChatView::setBufferForBacklogFetching(BufferId id) {
  77   scene()->setBufferForBacklogFetching(id);
  78 }
  79
  80 void ChatView::sliderPressed() {
  81   verticalScrollbarChanged(verticalScrollBar()->value());
  82 }
  83
  84 void ChatView::sliderReleased() {
  85   if(scene()->isFetchingBacklog()) scene()->setIsFetchingBacklog(false);
  86 }
  87
  88 void ChatView::verticalScrollbarChanged(int newPos) {
  89   Q_UNUSED(newPos);
  90   if(!scene()->isBacklogFetchingEnabled()) return;
  91
  92   QAbstractSlider *vbar = verticalScrollBar();
  93   if(!vbar)
  94     return;
  95   if(vbar->isSliderDown()) {
  96     /*
  97     int relativePos = 100;
  98     if(vbar->maximum() - vbar->minimum() != 0)
  99       relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
 100     scene()->setIsFetchingBacklog(relativePos < 20);
 101     */
 102     scene()->setIsFetchingBacklog(vbar->value() == vbar->minimum());
 103   }
 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
 115   return model->data(model->index(model->rowCount() - 1, 0), MessageModel::MsgIdRole).value<MsgId>();
 116 }