Another Speed boost for the new ChatView.
[quassel.git] / src / qtui / chatview.cpp
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20
21 #include <QGraphicsTextItem>
22 #include <QScrollBar>
23
24 #include "chatlinemodelitem.h"
25 #include "chatscene.h"
26 #include "chatview.h"
27 #include "client.h"
28 #include "messagefilter.h"
29 #include "quasselui.h"
30
31 ChatView::ChatView(BufferId bufferId, QWidget *parent)
32   : QGraphicsView(parent),
33     AbstractChatView()
34 {
35   QList<BufferId> filterList;
36   filterList.append(bufferId);
37   MessageFilter *filter = new MessageFilter(Client::messageModel(), filterList, this);
38   init(filter);
39 }
40
41 ChatView::ChatView(MessageFilter *filter, QWidget *parent)
42   : QGraphicsView(parent),
43     AbstractChatView()
44 {
45   init(filter);
46 }
47
48 void ChatView::init(MessageFilter *filter) {
49   setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
50   // setAlignment(Qt::AlignBottom);
51   setInteractive(true);
52   setOptimizationFlags(QGraphicsView::DontClipPainter | QGraphicsView::DontAdjustForAntialiasing);
53   setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
54   setTransformationAnchor(QGraphicsView::NoAnchor);
55
56   _scene = new ChatScene(filter, filter->idString(), viewport()->width() - 2, this); // see below: resizeEvent()
57   connect(_scene, SIGNAL(sceneRectChanged(const QRectF &)), this, SLOT(sceneRectChanged(const QRectF &)));
58   //connect(_scene, SIGNAL(lastLineChanged(QGraphicsItem *)), this, SLOT(lastLineChanged(QGraphicsItem *)));
59   setScene(_scene);
60
61   connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
62 }
63
64 void ChatView::resizeEvent(QResizeEvent *event) {
65   QGraphicsView::resizeEvent(event);
66
67   // FIXME: without the hardcoded -2 Qt reserves space for a horizontal scrollbar even though it's disabled permanently.
68   // this does only occur on QtX11 (at least not on Qt for Mac OS). Seems like a Qt Bug.
69   scene()->updateForViewport(viewport()->width() - 2, viewport()->height());
70   _lastScrollbarPos = verticalScrollBar()->maximum();
71   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
72 }
73
74 void ChatView::lastLineChanged(QGraphicsItem *chatLine) {
75   // FIXME: if vbar offset < chatline height -> centerOn(chatLine);
76   centerOn(chatLine);
77 }
78
79 void ChatView::verticalScrollbarChanged(int newPos) {
80   QAbstractSlider *vbar = verticalScrollBar();
81   Q_ASSERT(vbar);
82
83   if(vbar->maximum() - vbar->value() <= 5) // FIXME workaround the fact that the view gets scrolled up a few px on buffer change
84     vbar->setValue(vbar->maximum());
85
86   if(newPos < _lastScrollbarPos) {
87     int relativePos = 100;
88     if(vbar->maximum() - vbar->minimum() != 0)
89       relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
90
91     if(relativePos < 20) {
92       scene()->requestBacklog();
93     }
94   }
95   _lastScrollbarPos = newPos;
96 }
97
98 MsgId ChatView::lastMsgId() const {
99   if(!scene())
100     return MsgId();
101
102   QAbstractItemModel *model = scene()->model();
103   if(!model || model->rowCount() == 0)
104     return MsgId();
105
106   return model->data(model->index(model->rowCount() - 1, 0), MessageModel::MsgIdRole).value<MsgId>();
107 }