Bring back the workaround to not reserve space for the non-existing horizontal scroll...
[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
53   _scene = new ChatScene(filter, filter->idString(), viewport()->width(), this);
54   connect(_scene, SIGNAL(sceneHeightChanged(qreal)), this, SLOT(sceneHeightChanged(qreal)));
55   setScene(_scene);
56
57   _lastScrollbarPos = verticalScrollBar()->maximum();
58   connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
59 }
60
61 void ChatView::resizeEvent(QResizeEvent *event) {
62   QGraphicsView::resizeEvent(event);
63   scene()->setWidth(viewport()->width() - 2);  // FIXME figure out why we have to hardcode the -2 here -> Qt-Bug most probably
64   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
65 }
66
67 void ChatView::sceneHeightChanged(qreal dh) {
68   QAbstractSlider *vbar = verticalScrollBar();
69   Q_ASSERT(vbar);
70   if(vbar->maximum() - vbar->value() <= dh + 5) // in case we had scrolled only about half a line to the bottom we allow a grace of 5
71     vbar->setValue(vbar->maximum());
72 }
73
74 void ChatView::verticalScrollbarChanged(int newPos) {
75   QAbstractSlider *vbar = verticalScrollBar();
76   Q_ASSERT(vbar);
77
78   if(newPos < _lastScrollbarPos) {
79     int relativePos = 100;
80     if(vbar->maximum() - vbar->minimum() != 0)
81       relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
82
83     if(relativePos < 20) {
84       scene()->requestBacklog();
85     }
86   }
87   _lastScrollbarPos = newPos;
88 }
89
90 MsgId ChatView::lastMsgId() const {
91   if(!scene())
92     return MsgId();
93
94   QAbstractItemModel *model = scene()->model();
95   if(!model || model->rowCount() == 0)
96     return MsgId();
97
98   return model->data(model->index(model->rowCount() - 1, 0), MessageModel::MsgIdRole).value<MsgId>();
99 }