Added snap to grid drag behaviour

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

diff --git a/pv/view/view.cpp b/pv/view/view.cpp
index 81b3fcd225c60f8c1d24e994557a94492e8acbdd..0a31e808f20d9e78603994584677631ff1b94c13 100644 (file)
--- a/pv/view/view.cpp
+++ b/pv/view/view.cpp
@@ -30,6 +30,7 @@
 
 #include "header.h"
 #include "ruler.h"
+#include "signal.h"
 #include "view.h"
 #include "viewport.h"
 
@@ -52,6 +53,7 @@ const int View::RulerHeight = 30;
 const int View::MaxScrollValue = INT_MAX / 2;
 
 const int View::SignalHeight = 50;
+const int View::SignalSnapGridSize = 10;
 
 const QColor View::CursorAreaColour(220, 231, 243);
 
@@ -84,6 +86,9 @@ View::View(SigSession &session, QWidget *parent) :
        connect(&_cursors.second, SIGNAL(time_changed()),
                this, SLOT(marker_time_changed()));
 
+       connect(_header, SIGNAL(signals_moved()),
+               this, SLOT(signals_moved()));
+
        setViewportMargins(LabelMarginWidth, RulerHeight, 0, 0);
        setViewport(_viewport);
 
@@ -200,6 +205,16 @@ void View::update_scroll()
                _viewport->get_total_height() - areaSize.height());
 }
 
+void View::reset_signal_layout()
+{
+       int offset = 0;
+       vector< shared_ptr<Signal> > &sigs = _session.get_signals();
+       BOOST_FOREACH(shared_ptr<Signal> s, sigs) {
+               s->set_v_offset(offset);
+               offset += SignalHeight;
+       }
+}
+
 bool View::eventFilter(QObject *object, QEvent *event)
 {
        const QEvent::Type type = event->type();
@@ -291,6 +306,9 @@ void View::data_updated()
 
        // Repaint the view
        _viewport->update();
+
+       /// @todo: Call this only once when the signals are first created.
+       reset_signal_layout();
 }
 
 void View::marker_time_changed()
@@ -299,5 +317,11 @@ void View::marker_time_changed()
        _viewport->update();
 }
 
+void View::signals_moved()
+{
+       _header->update();
+       _viewport->update();
+}
+
 } // namespace view
 } // namespace pv