pv/view/viewport.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #include "view.h"
  22 #include "viewport.h"
  23
  24 #include "signal.h"
  25 #include "../sigsession.h"
  26
  27 #include <QMouseEvent>
  28
  29 #include <boost/foreach.hpp>
  30
  31 using boost::shared_ptr;
  32 using std::max;
  33 using std::min;
  34 using std::vector;
  35
  36 namespace pv {
  37 namespace view {
  38
  39 Viewport::Viewport(View &parent) :
  40         QWidget(&parent),
  41         _view(parent)
  42 {
  43         setMouseTracking(true);
  44         setAutoFillBackground(true);
  45         setBackgroundRole(QPalette::Base);
  46
  47         connect(&_view.session(), SIGNAL(signals_changed()),
  48                 this, SLOT(on_signals_changed()));
  49
  50         connect(&_view, SIGNAL(signals_moved()),
  51                 this, SLOT(on_signals_moved()));
  52 }
  53
  54 int Viewport::get_total_height() const
  55 {
  56         int h = 0;
  57         const vector< shared_ptr<Trace> > traces(_view.get_traces());
  58         BOOST_FOREACH(const shared_ptr<Trace> t, traces) {
  59                 assert(t);
  60                 h = max(t->get_v_offset() + View::SignalHeight, h);
  61         }
  62
  63         return h;
  64 }
  65
  66 void Viewport::paintEvent(QPaintEvent*)
  67 {
  68         const vector< shared_ptr<Trace> > traces(_view.get_traces());
  69
  70         QPainter p(this);
  71         p.setRenderHint(QPainter::Antialiasing);
  72
  73         if (_view.cursors_shown())
  74                 _view.cursors().draw_viewport_background(p, rect());
  75
  76         // Plot the signal
  77         BOOST_FOREACH(const shared_ptr<Trace> t, traces)
  78         {
  79                 assert(t);
  80                 t->paint_back(p, 0, width());
  81         }
  82
  83         BOOST_FOREACH(const shared_ptr<Trace> t, traces)
  84                 t->paint_mid(p, 0, width());
  85
  86         BOOST_FOREACH(const shared_ptr<Trace> t, traces)
  87                 t->paint_fore(p, 0, width());
  88
  89         if (_view.cursors_shown())
  90                 _view.cursors().draw_viewport_foreground(p, rect());
  91
  92         p.end();
  93 }
  94
  95 void Viewport::mousePressEvent(QMouseEvent *event)
  96 {
  97         assert(event);
  98
  99         _mouse_down_point = event->pos();
 100         _mouse_down_offset = _view.offset();
 101 }
 102
 103 void Viewport::mouseMoveEvent(QMouseEvent *event)
 104 {
 105         assert(event);
 106
 107         if (event->buttons() & Qt::LeftButton)
 108         {
 109                 _view.set_scale_offset(_view.scale(),
 110                         _mouse_down_offset +
 111                         (_mouse_down_point - event->pos()).x() *
 112                         _view.scale());
 113         }
 114 }
 115
 116 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
 117 {
 118         assert(event);
 119
 120         if (event->buttons() & Qt::LeftButton)
 121                 _view.zoom(2.0, event->x());
 122         else if (event->buttons() & Qt::RightButton)
 123                 _view.zoom(-2.0, event->x());
 124 }
 125
 126 void Viewport::wheelEvent(QWheelEvent *event)
 127 {
 128         assert(event);
 129
 130         if (event->orientation() == Qt::Vertical) {
 131                 // Vertical scrolling is interpreted as zooming in/out
 132                 _view.zoom(event->delta() / 120, event->x());
 133         } else if (event->orientation() == Qt::Horizontal) {
 134                 // Horizontal scrolling is interpreted as moving left/right
 135                 _view.set_scale_offset(_view.scale(),
 136                                        event->delta() * _view.scale()
 137                                        + _view.offset());
 138         }
 139 }
 140
 141 void Viewport::on_signals_changed()
 142 {
 143         const vector< shared_ptr<Trace> > traces(_view.get_traces());
 144         BOOST_FOREACH(shared_ptr<Trace> t, traces) {
 145                 assert(t);
 146                 connect(t.get(), SIGNAL(visibility_changed()),
 147                         this, SLOT(update()));
 148         }
 149 }
 150
 151 void Viewport::on_signals_moved()
 152 {
 153         update();
 154 }
 155
 156 } // namespace view
 157 } // namespace pv