X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=pv%2Fview%2Fview.cpp;h=6ea8cc0af30eea06c6fbc9e7523bf1e8ca257c1c;hb=d09674d4529828b6bd2cbaa027949b953d6bd96a;hp=34676334dc67867ba9b17fa064498232693e74e0;hpb=b16907d341861d227d6d2db3014ee36a2af4b619;p=pulseview.git

diff --git a/pv/view/view.cpp b/pv/view/view.cpp
index 34676334..6ea8cc0a 100644
--- a/pv/view/view.cpp
+++ b/pv/view/view.cpp
@@ -70,9 +70,9 @@ View::View(SigSession &session, QWidget *parent) :
 	_scale(1e-6),
 	_offset(0),
 	_v_offset(0),
+	_updating_scroll(false),
 	_show_cursors(false),
-	_cursors(pair<Cursor, Cursor>(Cursor(*this, 0.0),
-		Cursor(*this, 1.0))),
+	_cursors(*this),
 	_hover_point(-1, -1)
 {
 	connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
@@ -85,9 +85,9 @@ View::View(SigSession &session, QWidget *parent) :
 	connect(&_session, SIGNAL(data_updated()),
 		this, SLOT(data_updated()));
 
-	connect(&_cursors.first, SIGNAL(time_changed()),
+	connect(&_cursors.first(), SIGNAL(time_changed()),
 		this, SLOT(marker_time_changed()));
-	connect(&_cursors.second, SIGNAL(time_changed()),
+	connect(&_cursors.second(), SIGNAL(time_changed()),
 		this, SLOT(marker_time_changed()));
 
 	connect(_header, SIGNAL(signals_moved()),
@@ -161,7 +161,16 @@ void View::show_cursors(bool show)
 	_viewport->update();
 }
 
-std::pair<Cursor, Cursor>& View::cursors()
+void View::centre_cursors()
+{
+	const double time_width = _scale * _viewport->width();
+	_cursors.first().set_time(_offset + time_width * 0.4);
+	_cursors.second().set_time(_offset + time_width * 0.6);
+	_ruler->update();
+	_viewport->update();
+}
+
+CursorPair& View::cursors()
 {
 	return _cursors;
 }
@@ -208,7 +217,9 @@ void View::update_scroll()
 	get_scroll_layout(length, offset);
 	length = max(length - areaSize.width(), 0.0);
 
-	horizontalScrollBar()->setPageStep(areaSize.width());
+	horizontalScrollBar()->setPageStep(areaSize.width() / 2);
+
+	_updating_scroll = true;
 
 	if (length < MaxScrollValue) {
 		horizontalScrollBar()->setRange(0, length);
@@ -219,6 +230,8 @@ void View::update_scroll()
 			_offset * MaxScrollValue / (_scale * length));
 	}
 
+	_updating_scroll = false;
+
 	// Set the vertical scrollbar
 	verticalScrollBar()->setPageStep(areaSize.height());
 	verticalScrollBar()->setRange(0,
@@ -290,6 +303,9 @@ void View::resizeEvent(QResizeEvent*)
 
 void View::h_scroll_value_changed(int value)
 {
+	if (_updating_scroll)
+		return;
+
 	const int range = horizontalScrollBar()->maximum();
 	if (range < MaxScrollValue)
 		_offset = _scale * value;