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(Buffer *buf, QWidget *parent) : QGraphicsView(parent), AbstractChatView() {
  33   QList<BufferId> filterList;
  34   filterList.append(buf->bufferInfo().bufferId());
  35   MessageFilter *filter = new MessageFilter(Client::messageModel(), filterList, this);
  36   init(filter);
  37
  38 }
  39
  40 ChatView::ChatView(MessageFilter *filter, QWidget *parent) : QGraphicsView(parent), AbstractChatView() {
  41   init(filter);
  42 }
  43
  44 void ChatView::init(MessageFilter *filter) {
  45   setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
  46   setAlignment(Qt::AlignBottom);
  47   setInteractive(true);
  48
  49   _scene = new ChatScene(filter, filter->idString(), this);
  50   connect(_scene, SIGNAL(heightChanged(qreal)), this, SLOT(sceneHeightChanged(qreal)));
  51   setScene(_scene);
  52
  53   connect(verticalScrollBar(), SIGNAL(sliderPressed()), this, SLOT(sliderPressed()));
  54   connect(verticalScrollBar(), SIGNAL(sliderReleased()), this, SLOT(sliderReleased()));
  55   connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
  56 }
  57
  58 ChatView::~ChatView() {
  59
  60 }
  61
  62 ChatScene *ChatView::scene() const {
  63   return _scene;
  64 }
  65
  66 void ChatView::clear() {
  67
  68 }
  69
  70 void ChatView::resizeEvent(QResizeEvent *event) {
  71   scene()->setWidth(event->size().width() - 2);  // FIXME figure out why we have to hardcode the -2 here
  72   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
  73 }
  74
  75 void ChatView::sceneHeightChanged(qreal h) {
  76   Q_UNUSED(h)
  77   bool scrollable = qAbs(verticalScrollBar()->value() - verticalScrollBar()->maximum()) <= 2; // be a bit tolerant here, also FIXME (why we need this?)
  78   setSceneRect(scene()->sceneRect());
  79   if(scrollable) verticalScrollBar()->setValue(verticalScrollBar()->maximum());
  80 }
  81
  82 void ChatView::setBufferForBacklogFetching(BufferId id) {
  83   scene()->setBufferForBacklogFetching(id);
  84 }
  85
  86 void ChatView::sliderPressed() {
  87   verticalScrollbarChanged(verticalScrollBar()->value());
  88 }
  89
  90 void ChatView::sliderReleased() {
  91   if(scene()->isFetchingBacklog()) scene()->setIsFetchingBacklog(false);
  92 }
  93
  94 void ChatView::verticalScrollbarChanged(int newPos) {
  95   Q_UNUSED(newPos);
  96   if(!scene()->isBacklogFetchingEnabled()) return;
  97
  98   QAbstractSlider *vbar = verticalScrollBar();
  99   if(!vbar)
 100     return;
 101   if(vbar->isSliderDown()) {
 102     /*
 103     int relativePos = 100;
 104     if(vbar->maximum() - vbar->minimum() != 0)
 105       relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
 106     scene()->setIsFetchingBacklog(relativePos < 20);
 107     */
 108     scene()->setIsFetchingBacklog(vbar->value() == vbar->minimum());
 109   }
 110 }