Enable auto-scrolling while selecting text in ChatViews

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

diff --git a/src/qtui/chatview.cpp b/src/qtui/chatview.cpp
index fd31645..d360d9d 100644 (file)
--- a/src/qtui/chatview.cpp
+++ b/src/qtui/chatview.cpp
@@ -18,7 +18,6 @@
  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  ***************************************************************************/
 
-#include <QApplication>
 #include <QGraphicsTextItem>
 #include <QScrollBar>
 
@@ -58,9 +57,14 @@ void ChatView::init(MessageFilter *filter) {
   // 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);
 
@@ -81,12 +85,32 @@ void ChatView::resizeEvent(QResizeEvent *event) {
   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)
   QAbstractSlider *vbar = verticalScrollBar();
   Q_ASSERT(vbar);
-  if(QApplication::mouseButtons() == Qt::NoButton
-  && vbar->maximum() - vbar->value() <= (offset + 5) * _currentScaleFactor ) { // 5px grace area
+  if(vbar->maximum() - vbar->value() <= (offset + 5) * _currentScaleFactor ) { // 5px grace area
     vbar->setValue(vbar->maximum());
   }
 }