Added cursors

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

diff --git a/pv/view/view.cpp b/pv/view/view.cpp
index 4e0fed063fca8c4d42e67c5bcb6cb58c23cee390..7d3dc7f628a73b9bd5e4be03d6c8a6e45e33dfb2 100644 (file)
--- a/pv/view/view.cpp
+++ b/pv/view/view.cpp
@@ -1,5 +1,5 @@
 /*
- * This file is part of the sigrok project.
+ * This file is part of the PulseView project.
  *
  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
  *
@@ -19,11 +19,13 @@
  */
 
 #include <assert.h>
+#include <limits.h>
 #include <math.h>
 
 #include <boost/foreach.hpp>
 
 #include <QEvent>
+#include <QMouseEvent>
 #include <QScrollBar>
 
 #include "header.h"
@@ -31,9 +33,9 @@
 #include "view.h"
 #include "viewport.h"
 
-#include "../../logicdata.h"
-#include "../../logicdatasnapshot.h"
-#include "../../sigsession.h"
+#include "../logicdata.h"
+#include "../logicdatasnapshot.h"
+#include "../sigsession.h"
 
 using namespace boost;
 using namespace std;
@@ -47,8 +49,12 @@ const double View::MinScale = 1e-15;
 const int View::LabelMarginWidth = 70;
 const int View::RulerHeight = 30;
 
+const int View::MaxScrollValue = INT_MAX / 2;
+
 const int View::SignalHeight = 50;
 
+const QColor View::CursorAreaColour(220, 231, 243);
+
 View::View(SigSession &session, QWidget *parent) :
        QAbstractScrollArea(parent),
        _session(session),
@@ -58,7 +64,11 @@ View::View(SigSession &session, QWidget *parent) :
        _data_length(0),
        _scale(1e-6),
        _offset(0),
-       _v_offset(0)
+       _v_offset(0),
+       _show_cursors(false),
+       _cursors(pair<Cursor, Cursor>(Cursor(*this, 0.0),
+               Cursor(*this, 1.0))),
+       _hover_point(-1, -1)
 {
        connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
                this, SLOT(h_scroll_value_changed(int)));
@@ -69,6 +79,10 @@ View::View(SigSession &session, QWidget *parent) :
 
        setViewportMargins(LabelMarginWidth, RulerHeight, 0, 0);
        setViewport(_viewport);
+
+       _viewport->installEventFilter(this);
+       _ruler->installEventFilter(this);
+       _header->installEventFilter(this);
 }
 
 SigSession& View::session()
@@ -96,6 +110,19 @@ void View::zoom(double steps)
        zoom(steps, (width() - LabelMarginWidth) / 2);
 }
 
+void View::zoom(double steps, int offset)
+{
+       const double cursor_offset = _offset + _scale * offset;
+       _scale *= pow(3.0/2.0, -steps);
+       _scale = max(min(_scale, MaxScale), MinScale);
+       _offset = cursor_offset - _scale * offset;
+
+       _ruler->update();
+       _viewport->update();
+       update_scroll();
+}
+
+
 void View::set_scale_offset(double scale, double offset)
 {
        _scale = scale;
@@ -106,6 +133,38 @@ void View::set_scale_offset(double scale, double offset)
        _viewport->update();
 }
 
+bool View::cursors_shown() const
+{
+       return _show_cursors;
+}
+
+void View::show_cursors(bool show)
+{
+       _show_cursors = show;
+       _ruler->update();
+       _viewport->update();
+}
+
+std::pair<Cursor, Cursor>& View::cursors()
+{
+       return _cursors;
+}
+
+const QPoint& View::hover_point() const
+{
+       return _hover_point;
+}
+
+void View::get_scroll_layout(double &length, double &offset) const
+{
+       const shared_ptr<SignalData> sig_data = _session.get_data();
+       if(!sig_data)
+               return;
+
+       length = _data_length / (sig_data->get_samplerate() * _scale);
+       offset = _offset / _scale;
+}
+
 void View::update_scroll()
 {
        assert(_viewport);
@@ -114,17 +173,19 @@ void View::update_scroll()
 
        // Set the horizontal scroll bar
        double length = 0, offset = 0;
-       const shared_ptr<SignalData> sig_data = _session.get_data();
-       if(sig_data) {
-               length = _data_length /
-                       (sig_data->get_samplerate() * _scale);
-               offset = _offset / _scale;
-       }
+       get_scroll_layout(length, offset);
+       length = max(length - areaSize.width(), 0.0);
 
        horizontalScrollBar()->setPageStep(areaSize.width());
-       horizontalScrollBar()->setRange(0,
-               max((int)(length - areaSize.width()), 0));
-       horizontalScrollBar()->setSliderPosition(offset);
+
+       if(length < MaxScrollValue) {
+               horizontalScrollBar()->setRange(0, length);
+               horizontalScrollBar()->setSliderPosition(offset);
+       } else {
+               horizontalScrollBar()->setRange(0, MaxScrollValue);
+               horizontalScrollBar()->setSliderPosition(
+                       _offset * MaxScrollValue / (_scale * length));
+       }
 
        // Set the vertical scrollbar
        verticalScrollBar()->setPageStep(areaSize.height());
@@ -132,16 +193,29 @@ void View::update_scroll()
                _viewport->get_total_height() - areaSize.height());
 }
 
-void View::zoom(double steps, int offset)
+bool View::eventFilter(QObject *object, QEvent *event)
 {
-       const double cursor_offset = _offset + _scale * offset;
-       _scale *= pow(3.0/2.0, -steps);
-       _scale = max(min(_scale, MaxScale), MinScale);
-       _offset = cursor_offset - _scale * offset;
+       const QEvent::Type type = event->type();
+       if(type == QEvent::MouseMove) {
+
+               const QMouseEvent *const mouse_event = (QMouseEvent*)event;
+               if(object == _viewport)
+                       _hover_point = mouse_event->pos();
+               else if(object == _ruler)
+                       _hover_point = QPoint(mouse_event->x(), 0);
+               else if(object == _header)
+                       _hover_point = QPoint(0, mouse_event->y());
+               else
+                       _hover_point = QPoint(-1, -1);
+
+               hover_point_changed();
+
+       } else if(type == QEvent::Leave) {
+               _hover_point = QPoint(-1, -1);
+               hover_point_changed();
+       }
 
-       _ruler->update();
-       _viewport->update();
-       update_scroll();
+       return QObject::eventFilter(object, event);
 }
 
 bool View::viewportEvent(QEvent *e)
@@ -171,7 +245,15 @@ void View::resizeEvent(QResizeEvent *e)
 
 void View::h_scroll_value_changed(int value)
 {
-       _offset = _scale * value;
+       const int range = horizontalScrollBar()->maximum();
+       if(range < MaxScrollValue)
+               _offset = _scale * value;
+       else {
+               double length = 0, offset;
+               get_scroll_layout(length, offset);
+               _offset = _scale * length * value / MaxScrollValue;
+       }
+
        _ruler->update();
        _viewport->update();
 }