X-Git-Url: https://git.quassel-irc.org/?p=quassel.git;a=blobdiff_plain;f=src%2Fqtui%2Fchatview.cpp;h=94f3fb74097ad5a6e2626455645f78696af515be;hp=1eee224592df9fd72469bbbe2b225f6dec2a3502;hb=1e178fffec52593b5ff5b94f5f30dcb43b611034;hpb=332069a1830ed3a055ac6f2d7661bae1cc83e40c

diff --git a/src/qtui/chatview.cpp b/src/qtui/chatview.cpp
index 1eee2245..94f3fb74 100644
--- a/src/qtui/chatview.cpp
+++ b/src/qtui/chatview.cpp
@@ -49,37 +49,58 @@ void ChatView::init(MessageFilter *filter) {
   setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
   setAlignment(Qt::AlignBottom);
   setInteractive(true);
+  //setOptimizationFlags(QGraphicsView::DontClipPainter | QGraphicsView::DontAdjustForAntialiasing);
+  // setOptimizationFlags(QGraphicsView::DontAdjustForAntialiasing);
+  setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
+  setTransformationAnchor(QGraphicsView::NoAnchor);
 
-  _scene = new ChatScene(filter, filter->idString(), this);
-  connect(_scene, SIGNAL(heightChanged(qreal)), this, SLOT(sceneHeightChanged(qreal)));
+  _scene = new ChatScene(filter, filter->idString(), viewport()->width() - 2, this); // see below: resizeEvent()
+  connect(_scene, SIGNAL(sceneRectChanged(const QRectF &)), this, SLOT(sceneRectChanged(const QRectF &)));
+  connect(_scene, SIGNAL(lastLineChanged(QGraphicsItem *, qreal)), this, SLOT(lastLineChanged(QGraphicsItem *, qreal)));
   setScene(_scene);
+  // installEventFilter(_scene);
 
   connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
 }
 
 void ChatView::resizeEvent(QResizeEvent *event) {
-  scene()->setWidth(event->size().width() - 2);  // FIXME figure out why we have to hardcode the -2 here
+  QGraphicsView::resizeEvent(event);
+
+  // we can reduce viewport updates if we scroll to the bottom allready at the beginning
+  verticalScrollBar()->setValue(verticalScrollBar()->maximum());
+
+  // FIXME: without the hardcoded -4 Qt reserves space for a horizontal scrollbar even though it's disabled permanently.
+  // this does only occur on QtX11 (at least not on Qt for Mac OS). Seems like a Qt Bug.
+  scene()->updateForViewport(viewport()->width() - 4, viewport()->height());
+
+  _lastScrollbarPos = verticalScrollBar()->maximum();
   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
 }
 
-void ChatView::sceneHeightChanged(qreal h) {
-  Q_UNUSED(h)
-  bool scrollable = qAbs(verticalScrollBar()->value() - verticalScrollBar()->maximum()) <= 2; // be a bit tolerant here, also FIXME (why we need this?)
-  setSceneRect(scene()->sceneRect());
-  if(scrollable) verticalScrollBar()->setValue(verticalScrollBar()->maximum());
+void ChatView::lastLineChanged(QGraphicsItem *chatLine, qreal offset) {
+  Q_UNUSED(chatLine)
+  QAbstractSlider *vbar = verticalScrollBar();
+  Q_ASSERT(vbar);
+  if(vbar->maximum() - vbar->value() <= offset + 5) { // 5px grace area
+    vbar->setValue(vbar->maximum());
+  }
 }
 
 void ChatView::verticalScrollbarChanged(int newPos) {
   QAbstractSlider *vbar = verticalScrollBar();
   Q_ASSERT(vbar);
 
-  int relativePos = 100;
-  if(vbar->maximum() - vbar->minimum() != 0)
-    relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
+  // check for backlog request
+  if(newPos < _lastScrollbarPos) {
+    int relativePos = 100;
+    if(vbar->maximum() - vbar->minimum() != 0)
+      relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
 
-  if(relativePos < 20) {
-    scene()->requestBacklog();
+    if(relativePos < 20) {
+      scene()->requestBacklog();
+    }
   }
+  _lastScrollbarPos = newPos;
 }
 
 MsgId ChatView::lastMsgId() const {