Bring back dynamic backlog fetching (move scrollbar slider to the very top to get...

[quassel.git] / src / qtui / chatview.cpp

diff --git a/src/qtui/chatview.cpp b/src/qtui/chatview.cpp
index be2cbc6..6d4e5ea 100644 (file)
--- a/src/qtui/chatview.cpp
+++ b/src/qtui/chatview.cpp
@@ -49,17 +49,24 @@ void ChatView::init(MessageFilter *filter) {
   _scene = new ChatScene(filter, filter->idString(), this);
   connect(_scene, SIGNAL(heightChanged(qreal)), this, SLOT(sceneHeightChanged(qreal)));
   setScene(_scene);
+
+  connect(verticalScrollBar(), SIGNAL(sliderPressed()), this, SLOT(sliderPressed()));
+  connect(verticalScrollBar(), SIGNAL(sliderReleased()), this, SLOT(sliderReleased()));
+  connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(verticalScrollbarChanged(int)));
 }
 
 ChatView::~ChatView() {
 
 }
 
-
 ChatScene *ChatView::scene() const {
   return _scene;
 }
 
+void ChatView::clear() {
+
+}
+
 void ChatView::resizeEvent(QResizeEvent *event) {
   scene()->setWidth(event->size().width() - 2);  // FIXME figure out why we have to hardcode the -2 here
   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
@@ -72,6 +79,32 @@ void ChatView::sceneHeightChanged(qreal h) {
   if(scrollable) verticalScrollBar()->setValue(verticalScrollBar()->maximum());
 }
 
-void ChatView::clear()
-{
+void ChatView::setBufferForBacklogFetching(BufferId id) {
+  scene()->setBufferForBacklogFetching(id);
+}
+
+void ChatView::sliderPressed() {
+  verticalScrollbarChanged(verticalScrollBar()->value());
+}
+
+void ChatView::sliderReleased() {
+  if(scene()->isFetchingBacklog()) scene()->setIsFetchingBacklog(false);
+}
+
+void ChatView::verticalScrollbarChanged(int newPos) {
+  Q_UNUSED(newPos);
+  if(!scene()->isBacklogFetchingEnabled()) return;
+
+  QAbstractSlider *vbar = verticalScrollBar();
+  if(!vbar)
+    return;
+  if(vbar->isSliderDown()) {
+    /*
+    int relativePos = 100;
+    if(vbar->maximum() - vbar->minimum() != 0)
+      relativePos = (newPos - vbar->minimum()) * 100 / (vbar->maximum() - vbar->minimum());
+    scene()->setIsFetchingBacklog(relativePos < 20);
+    */
+    scene()->setIsFetchingBacklog(vbar->value() == vbar->minimum());
+  }
 }