1 /***************************************************************************
2 * Copyright (C) 2005-08 by the Quassel Project *
3 * devel@quassel-irc.org *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) version 3. *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
21 #include <QGraphicsTextItem>
24 #include "chatlinemodelitem.h"
25 #include "chatscene.h"
28 #include "messagefilter.h"
29 #include "quasselui.h"
31 ChatView::ChatView(BufferId bufferId, QWidget *parent)
32 : QGraphicsView(parent),
35 QList<BufferId> filterList;
36 filterList.append(bufferId);
37 MessageFilter *filter = new MessageFilter(Client::messageModel(), filterList, this);
41 ChatView::ChatView(MessageFilter *filter, QWidget *parent)
42 : QGraphicsView(parent),
48 void ChatView::init(MessageFilter *filter) {
49 setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
50 setAlignment(Qt::AlignBottom);
52 //setOptimizationFlags(QGraphicsView::DontClipPainter | QGraphicsView::DontAdjustForAntialiasing);
53 // setOptimizationFlags(QGraphicsView::DontAdjustForAntialiasing);
54 setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
55 setTransformationAnchor(QGraphicsView::NoAnchor);
57 _scene = new ChatScene(filter, filter->idString(), viewport()->width() - 2, this); // see below: resizeEvent()
58 connect(_scene, SIGNAL(sceneRectChanged(const QRectF &)), this, SLOT(sceneRectChanged(const QRectF &)));
59 connect(_scene, SIGNAL(lastLineChanged(QGraphicsItem *, qreal)), this, SLOT(lastLineChanged(QGraphicsItem *, qreal)));
61 // installEventFilter(_scene);
63 connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
66 void ChatView::resizeEvent(QResizeEvent *event) {
67 QGraphicsView::resizeEvent(event);
69 // we can reduce viewport updates if we scroll to the bottom allready at the beginning
70 verticalScrollBar()->setValue(verticalScrollBar()->maximum());
72 // FIXME: without the hardcoded -4 Qt reserves space for a horizontal scrollbar even though it's disabled permanently.
73 // this does only occur on QtX11 (at least not on Qt for Mac OS). Seems like a Qt Bug.
74 scene()->updateForViewport(viewport()->width() - 4, viewport()->height());
76 _lastScrollbarPos = verticalScrollBar()->maximum();
77 verticalScrollBar()->setValue(verticalScrollBar()->maximum());
80 void ChatView::lastLineChanged(QGraphicsItem *chatLine, qreal offset) {
82 QAbstractSlider *vbar = verticalScrollBar();
84 if(vbar->maximum() - vbar->value() <= offset + 5) { // 5px grace area
85 vbar->setValue(vbar->maximum());
89 void ChatView::verticalScrollbarChanged(int newPos) {
90 QAbstractSlider *vbar = verticalScrollBar();
93 // check for backlog request
94 if(newPos < _lastScrollbarPos) {
95 int relativePos = 100;
96 if(vbar->maximum() - vbar->minimum() != 0)
97 relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
99 if(relativePos < 20) {
100 scene()->requestBacklog();
103 _lastScrollbarPos = newPos;
106 MsgId ChatView::lastMsgId() const {
110 QAbstractItemModel *model = scene()->model();
111 if(!model || model->rowCount() == 0)
114 return model->data(model->index(model->rowCount() - 1, 0), MessageModel::MsgIdRole).value<MsgId>();