some minor smoothifications to the nick selector
[quassel.git] / src / qtui / chatview.cpp
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2  *   Copyright (C) 2005-09 by the Quassel Project                          *
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20
21 #include <QGraphicsTextItem>
22 #include <QKeyEvent>
23 #include <QMenu>
24 #include <QScrollBar>
25
26 #include "bufferwidget.h"
27 #include "chatscene.h"
28 #include "chatview.h"
29 #include "client.h"
30 #include "messagefilter.h"
31 #include "quasselui.h"
32
33 ChatView::ChatView(BufferId bufferId, QWidget *parent)
34   : QGraphicsView(parent),
35     AbstractChatView(),
36     _bufferContainer(0),
37     _currentScaleFactor(1)
38 {
39   QList<BufferId> filterList;
40   filterList.append(bufferId);
41   MessageFilter *filter = new MessageFilter(Client::messageModel(), filterList, this);
42   init(filter);
43 }
44
45 ChatView::ChatView(MessageFilter *filter, QWidget *parent)
46   : QGraphicsView(parent),
47     AbstractChatView(),
48     _bufferContainer(0),
49     _currentScaleFactor(1)
50 {
51   init(filter);
52 }
53
54 void ChatView::init(MessageFilter *filter) {
55   setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
56   setAlignment(Qt::AlignBottom);
57   setInteractive(true);
58   //setOptimizationFlags(QGraphicsView::DontClipPainter | QGraphicsView::DontAdjustForAntialiasing);
59   // setOptimizationFlags(QGraphicsView::DontAdjustForAntialiasing);
60   setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
61   // setTransformationAnchor(QGraphicsView::NoAnchor);
62   setTransformationAnchor(QGraphicsView::AnchorViewCenter);
63
64   _scrollTimer.setInterval(100);
65   _scrollTimer.setSingleShot(true);
66   connect(&_scrollTimer, SIGNAL(timeout()), SLOT(scrollTimerTimeout()));
67
68   _scene = new ChatScene(filter, filter->idString(), viewport()->width() - 4, this); // see below: resizeEvent()
69   connect(_scene, SIGNAL(sceneRectChanged(const QRectF &)), this, SLOT(sceneRectChanged(const QRectF &)));
70   connect(_scene, SIGNAL(lastLineChanged(QGraphicsItem *, qreal)), this, SLOT(lastLineChanged(QGraphicsItem *, qreal)));
71   connect(_scene, SIGNAL(mouseMoveWhileSelecting(const QPointF &)), this, SLOT(mouseMoveWhileSelecting(const QPointF &)));
72   setScene(_scene);
73
74   connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
75 }
76
77 bool ChatView::event(QEvent *event) {
78   if(event->type() == QEvent::KeyPress) {
79     QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event);
80     switch(keyEvent->key()) {
81     case Qt::Key_Up:
82     case Qt::Key_Down:
83     case Qt::Key_PageUp:
84     case Qt::Key_PageDown:
85       if(!verticalScrollBar()->isVisible()) {
86         scene()->requestBacklog();
87         return true;
88       }
89     default:
90       break;
91     }
92   }
93
94   if(event->type() == QEvent::Wheel) {
95     if(!verticalScrollBar()->isVisible()) {
96       scene()->requestBacklog();
97       return true;
98     }
99   }
100
101   return QGraphicsView::event(event);
102 }
103
104 void ChatView::resizeEvent(QResizeEvent *event) {
105   QGraphicsView::resizeEvent(event);
106
107   // we can reduce viewport updates if we scroll to the bottom allready at the beginning
108   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
109
110   // FIXME: without the hardcoded -4 Qt reserves space for a horizontal scrollbar even though it's disabled permanently.
111   // this does only occur on QtX11 (at least not on Qt for Mac OS). Seems like a Qt Bug.
112   scene()->updateForViewport(viewport()->width() - 4, viewport()->height());
113
114   _lastScrollbarPos = verticalScrollBar()->maximum();
115   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
116 }
117
118 void ChatView::mouseMoveWhileSelecting(const QPointF &scenePos) {
119   int y = (int)mapFromScene(scenePos).y();
120   _scrollOffset = 0;
121   if(y < 0)
122     _scrollOffset = y;
123   else if(y > height())
124     _scrollOffset = y - height();
125
126   if(_scrollOffset && !_scrollTimer.isActive())
127     _scrollTimer.start();
128 }
129
130 void ChatView::scrollTimerTimeout() {
131   // scroll view
132   QAbstractSlider *vbar = verticalScrollBar();
133   if(_scrollOffset < 0 && vbar->value() > 0)
134     vbar->setValue(qMax(vbar->value() + _scrollOffset, 0));
135   else if(_scrollOffset > 0 && vbar->value() < vbar->maximum())
136     vbar->setValue(qMin(vbar->value() + _scrollOffset, vbar->maximum()));
137 }
138
139 void ChatView::lastLineChanged(QGraphicsItem *chatLine, qreal offset) {
140   Q_UNUSED(chatLine)
141   // disabled until further testing/discussion
142   //if(!scene()->isScrollingAllowed())
143   //  return;
144
145   QAbstractSlider *vbar = verticalScrollBar();
146   Q_ASSERT(vbar);
147   if(vbar->maximum() - vbar->value() <= (offset + 5) * _currentScaleFactor ) { // 5px grace area
148     vbar->setValue(vbar->maximum());
149   }
150 }
151
152 void ChatView::verticalScrollbarChanged(int newPos) {
153   QAbstractSlider *vbar = verticalScrollBar();
154   Q_ASSERT(vbar);
155
156   // check for backlog request
157   if(newPos < _lastScrollbarPos) {
158     int relativePos = 100;
159     if(vbar->maximum() - vbar->minimum() != 0)
160       relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
161
162     if(relativePos < 20) {
163       scene()->requestBacklog();
164     }
165   }
166   _lastScrollbarPos = newPos;
167 }
168
169 MsgId ChatView::lastMsgId() const {
170   if(!scene())
171     return MsgId();
172
173   QAbstractItemModel *model = scene()->model();
174   if(!model || model->rowCount() == 0)
175     return MsgId();
176
177   return model->data(model->index(model->rowCount() - 1, 0), MessageModel::MsgIdRole).value<MsgId>();
178 }
179
180 void ChatView::addActionsToMenu(QMenu *menu, const QPointF &pos) {
181   // zoom actions
182   BufferWidget *bw = qobject_cast<BufferWidget *>(bufferContainer());
183   if(bw) {
184     bw->addActionsToMenu(menu, pos);
185     menu->addSeparator();
186   }
187 }
188
189 void ChatView::zoomIn() {
190     _currentScaleFactor *= 1.2;
191     scale(1.2, 1.2);
192     scene()->setWidth(viewport()->width() / _currentScaleFactor - 2);
193 }
194
195 void ChatView::zoomOut() {
196     _currentScaleFactor /= 1.2;
197     scale(1 / 1.2, 1 / 1.2);
198     scene()->setWidth(viewport()->width() / _currentScaleFactor - 2);
199 }
200
201 void ChatView::zoomOriginal() {
202     scale(1/_currentScaleFactor, 1/_currentScaleFactor);
203     _currentScaleFactor = 1;
204     scene()->setWidth(viewport()->width() - 2);
205 }