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 namespace boost;
  32 using namespace std;
  33
  34 namespace pv {
  35 namespace view {
  36
  37 Viewport::Viewport(View &parent) :
  38         QWidget(&parent),
  39         _view(parent)
  40 {
  41         setMouseTracking(true);
  42         setAutoFillBackground(true);
  43         setBackgroundRole(QPalette::Base);
  44
  45         connect(&_view.session(), SIGNAL(signals_changed()),
  46                 this, SLOT(on_signals_changed()));
  47
  48         connect(&_view, SIGNAL(signals_moved()),
  49                 this, SLOT(on_signals_moved()));
  50 }
  51
  52 int Viewport::get_total_height() const
  53 {
  54         int h = 0;
  55         const vector< shared_ptr<Trace> > traces(_view.get_traces());
  56         BOOST_FOREACH(const shared_ptr<Trace> t, traces) {
  57                 assert(t);
  58                 h = max(t->get_v_offset() + View::SignalHeight, h);
  59         }
  60
  61         return h;
  62 }
  63
  64 void Viewport::paintEvent(QPaintEvent*)
  65 {
  66         const vector< shared_ptr<Trace> > traces(_view.get_traces());
  67
  68         QPainter p(this);
  69         p.setRenderHint(QPainter::Antialiasing);
  70
  71         if (_view.cursors_shown())
  72                 _view.cursors().draw_viewport_background(p, rect());
  73
  74         // Plot the signal
  75         BOOST_FOREACH(const shared_ptr<Trace> t, traces)
  76         {
  77                 assert(t);
  78                 t->paint_back(p, 0, width());
  79         }
  80
  81         BOOST_FOREACH(const shared_ptr<Trace> t, traces)
  82                 t->paint_mid(p, 0, width());
  83
  84         BOOST_FOREACH(const shared_ptr<Trace> t, traces)
  85                 t->paint_fore(p, 0, width());
  86
  87         if (_view.cursors_shown())
  88                 _view.cursors().draw_viewport_foreground(p, rect());
  89
  90         p.end();
  91 }
  92
  93 void Viewport::mousePressEvent(QMouseEvent *event)
  94 {
  95         assert(event);
  96
  97         _mouse_down_point = event->pos();
  98         _mouse_down_offset = _view.offset();
  99 }
 100
 101 void Viewport::mouseMoveEvent(QMouseEvent *event)
 102 {
 103         assert(event);
 104
 105         if (event->buttons() & Qt::LeftButton)
 106         {
 107                 _view.set_scale_offset(_view.scale(),
 108                         _mouse_down_offset +
 109                         (_mouse_down_point - event->pos()).x() *
 110                         _view.scale());
 111         }
 112 }
 113
 114 void Viewport::wheelEvent(QWheelEvent *event)
 115 {
 116         assert(event);
 117
 118         if (event->orientation() == Qt::Vertical) {
 119                 // Vertical scrolling is interpreted as zooming in/out
 120                 _view.zoom(event->delta() / 120, event->x());
 121         } else if (event->orientation() == Qt::Horizontal) {
 122                 // Horizontal scrolling is interpreted as moving left/right
 123                 _view.set_scale_offset(_view.scale(),
 124                                        event->delta() * _view.scale()
 125                                        + _view.offset());
 126         }
 127 }
 128
 129 void Viewport::on_signals_changed()
 130 {
 131         const vector< shared_ptr<Trace> > traces(_view.get_traces());
 132         BOOST_FOREACH(shared_ptr<Trace> t, traces) {
 133                 assert(t);
 134                 connect(t.get(), SIGNAL(visibility_changed()),
 135                         this, SLOT(update()));
 136         }
 137 }
 138
 139 void Viewport::on_signals_moved()
 140 {
 141         update();
 142 }
 143
 144 } // namespace view
 145 } // namespace pv