Fixed the H-scroll page width to half a screen rather than a full screen.

[pulseview.git] / pv / view / view.cpp

diff --git a/pv/view/view.cpp b/pv/view/view.cpp
index 10f6613c55da3fd2f362e51c67ff365a708b4359..95b8a5bec9e9f1fde845898ee5ed7a0cf1bfcc58 100644 (file)
--- a/pv/view/view.cpp
+++ b/pv/view/view.cpp
@@ -70,6 +70,7 @@ 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))),
@@ -208,7 +209,9 @@ 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 +222,8 @@ void View::update_scroll()
                        _offset * MaxScrollValue / (_scale * length));
        }
 
+       _updating_scroll = false;
+
        // Set the vertical scrollbar
        verticalScrollBar()->setPageStep(areaSize.height());
        verticalScrollBar()->setRange(0,
@@ -228,7 +233,7 @@ void View::update_scroll()
 
 void View::reset_signal_layout()
 {
-       int offset = SignalMargin;
+       int offset = SignalMargin + SignalHeight;
        const vector< shared_ptr<Signal> > sigs(_session.get_signals());
        BOOST_FOREACH(shared_ptr<Signal> s, sigs) {
                s->set_v_offset(offset);
@@ -290,6 +295,9 @@ 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;