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),
34 _currentScaleFactor(1)
36 QList<BufferId> filterList;
37 filterList.append(bufferId);
38 MessageFilter *filter = new MessageFilter(Client::messageModel(), filterList, this);
42 ChatView::ChatView(MessageFilter *filter, QWidget *parent)
43 : QGraphicsView(parent),
45 _currentScaleFactor(1)
50 void ChatView::init(MessageFilter *filter) {
51 setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
52 setAlignment(Qt::AlignBottom);
54 //setOptimizationFlags(QGraphicsView::DontClipPainter | QGraphicsView::DontAdjustForAntialiasing);
55 // setOptimizationFlags(QGraphicsView::DontAdjustForAntialiasing);
56 setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
57 // setTransformationAnchor(QGraphicsView::NoAnchor);
58 setTransformationAnchor(QGraphicsView::AnchorViewCenter);
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)));
64 // installEventFilter(_scene);
66 connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
69 void ChatView::resizeEvent(QResizeEvent *event) {
70 QGraphicsView::resizeEvent(event);
72 // we can reduce viewport updates if we scroll to the bottom allready at the beginning
73 verticalScrollBar()->setValue(verticalScrollBar()->maximum());
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());
79 _lastScrollbarPos = verticalScrollBar()->maximum();
80 verticalScrollBar()->setValue(verticalScrollBar()->maximum());
83 void ChatView::lastLineChanged(QGraphicsItem *chatLine, qreal offset) {
85 QAbstractSlider *vbar = verticalScrollBar();
87 if(vbar->maximum() - vbar->value() <= (offset + 5) * _currentScaleFactor ) { // 5px grace area
88 vbar->setValue(vbar->maximum());
92 void ChatView::verticalScrollbarChanged(int newPos) {
93 QAbstractSlider *vbar = verticalScrollBar();
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());
102 if(relativePos < 20) {
103 scene()->requestBacklog();
106 _lastScrollbarPos = newPos;
109 MsgId ChatView::lastMsgId() const {
113 QAbstractItemModel *model = scene()->model();
114 if(!model || model->rowCount() == 0)
117 return model->data(model->index(model->rowCount() - 1, 0), MessageModel::MsgIdRole).value<MsgId>();
120 void ChatView::zoomIn() {
121 _currentScaleFactor *= 1.2;
123 scene()->setWidth(viewport()->width() / _currentScaleFactor - 2);
126 void ChatView::zoomOut() {
127 _currentScaleFactor /= 1.2;
128 scale(1 / 1.2, 1 / 1.2);
129 scene()->setWidth(viewport()->width() / _currentScaleFactor - 2);
132 void ChatView::zoomNormal() {
133 scale(1/_currentScaleFactor, 1/_currentScaleFactor);
134 _currentScaleFactor = 1;
135 scene()->setWidth(viewport()->width() - 2);