ChatView now asks the scene if scrolling is ok on message appending

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

diff --git a/src/qtui/chatview.cpp b/src/qtui/chatview.cpp
index b3c27f4..536a511 100644 (file)
--- a/src/qtui/chatview.cpp
+++ b/src/qtui/chatview.cpp
@@ -30,7 +30,8 @@
 
 ChatView::ChatView(BufferId bufferId, QWidget *parent)
   : QGraphicsView(parent),
-    AbstractChatView()
+    AbstractChatView(),
+    _currentScaleFactor(1)
 {
   QList<BufferId> filterList;
   filterList.append(bufferId);
@@ -40,7 +41,8 @@ ChatView::ChatView(BufferId bufferId, QWidget *parent)
 
 ChatView::ChatView(MessageFilter *filter, QWidget *parent)
   : QGraphicsView(parent),
-    AbstractChatView()
+    AbstractChatView(),
+    _currentScaleFactor(1)
 {
   init(filter);
 }
@@ -52,11 +54,17 @@ void ChatView::init(MessageFilter *filter) {
   //setOptimizationFlags(QGraphicsView::DontClipPainter | QGraphicsView::DontAdjustForAntialiasing);
   // setOptimizationFlags(QGraphicsView::DontAdjustForAntialiasing);
   setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
-  setTransformationAnchor(QGraphicsView::NoAnchor);
+  // setTransformationAnchor(QGraphicsView::NoAnchor);
+  setTransformationAnchor(QGraphicsView::AnchorViewCenter);
+
+  _scrollTimer.setInterval(100);
+  _scrollTimer.setSingleShot(true);
+  connect(&_scrollTimer, SIGNAL(timeout()), SLOT(scrollTimerTimeout()));
 
   _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)));
+  connect(_scene, SIGNAL(mouseMoveWhileSelecting(const QPointF &)), this, SLOT(mouseMoveWhileSelecting(const QPointF &)));
   setScene(_scene);
   // installEventFilter(_scene);
 
@@ -69,19 +77,43 @@ void ChatView::resizeEvent(QResizeEvent *event) {
   // we can reduce viewport updates if we scroll to the bottom allready at the beginning
   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
 
-  // FIXME: without the hardcoded -2 Qt reserves space for a horizontal scrollbar even though it's disabled permanently.
+  // 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() - 2, viewport()->height());
+  scene()->updateForViewport(viewport()->width() - 4, viewport()->height());
 
   _lastScrollbarPos = verticalScrollBar()->maximum();
   verticalScrollBar()->setValue(verticalScrollBar()->maximum());
 }
 
+void ChatView::mouseMoveWhileSelecting(const QPointF &scenePos) {
+  int y = (int)mapFromScene(scenePos).y();
+  _scrollOffset = 0;
+  if(y < 0)
+    _scrollOffset = y;
+  else if(y > height())
+    _scrollOffset = y - height();
+
+  if(_scrollOffset && !_scrollTimer.isActive())
+    _scrollTimer.start();
+}
+
+void ChatView::scrollTimerTimeout() {
+  // scroll view
+  QAbstractSlider *vbar = verticalScrollBar();
+  if(_scrollOffset < 0 && vbar->value() > 0)
+    vbar->setValue(qMax(vbar->value() + _scrollOffset, 0));
+  else if(_scrollOffset > 0 && vbar->value() < vbar->maximum())
+    vbar->setValue(qMin(vbar->value() + _scrollOffset, vbar->maximum()));
+}
+
 void ChatView::lastLineChanged(QGraphicsItem *chatLine, qreal offset) {
   Q_UNUSED(chatLine)
+  if(!scene()->isScrollingAllowed())
+    return;
+
   QAbstractSlider *vbar = verticalScrollBar();
   Q_ASSERT(vbar);
-  if(vbar->maximum() - vbar->value() <= offset + 5) { // 5px grace area
+  if(vbar->maximum() - vbar->value() <= (offset + 5) * _currentScaleFactor ) { // 5px grace area
     vbar->setValue(vbar->maximum());
   }
 }
@@ -113,3 +145,21 @@ MsgId ChatView::lastMsgId() const {
 
   return model->data(model->index(model->rowCount() - 1, 0), MessageModel::MsgIdRole).value<MsgId>();
 }
+
+void ChatView::zoomIn() {
+    _currentScaleFactor *= 1.2;
+    scale(1.2, 1.2);
+    scene()->setWidth(viewport()->width() / _currentScaleFactor - 2);
+}
+
+void ChatView::zoomOut() {
+    _currentScaleFactor /= 1.2;
+    scale(1 / 1.2, 1 / 1.2);
+    scene()->setWidth(viewport()->width() / _currentScaleFactor - 2);
+}
+
+void ChatView::zoomNormal() {
+    scale(1/_currentScaleFactor, 1/_currentScaleFactor);
+    _currentScaleFactor = 1;
+    scene()->setWidth(viewport()->width() - 2);
+}