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 <cassert>
  22 #include <cmath>
  23
  24 #include "view.h"
  25 #include "viewport.h"
  26
  27 #include "signal.h"
  28 #include "../sigsession.h"
  29
  30 #include <QMouseEvent>
  31
  32 using std::abs;
  33 using std::max;
  34 using std::min;
  35 using std::shared_ptr;
  36 using std::vector;
  37
  38 namespace pv {
  39 namespace view {
  40
  41 Viewport::Viewport(View &parent) :
  42         QWidget(&parent),
  43         _view(parent),
  44         _mouse_down_valid(false),
  45         _pinch_zoom_active(false)
  46 {
  47         setAttribute(Qt::WA_AcceptTouchEvents, true);
  48
  49         setMouseTracking(true);
  50         setAutoFillBackground(true);
  51         setBackgroundRole(QPalette::Base);
  52
  53         connect(&_view.session(), SIGNAL(signals_changed()),
  54                 this, SLOT(on_signals_changed()));
  55
  56         connect(&_view, SIGNAL(signals_moved()),
  57                 this, SLOT(on_signals_moved()));
  58
  59         // Trigger the initial event manually. The default device has signals
  60         // which were created before this object came into being
  61         on_signals_changed();
  62 }
  63
  64 int Viewport::get_total_height() const
  65 {
  66         int h = 0;
  67         const vector< shared_ptr<Trace> > traces(_view.get_traces());
  68         for (const shared_ptr<Trace> t : traces) {
  69                 assert(t);
  70                 h = max(t->v_offset() + View::SignalHeight, h);
  71         }
  72
  73         return h;
  74 }
  75
  76 void Viewport::paintEvent(QPaintEvent*)
  77 {
  78         const vector< shared_ptr<Trace> > traces(_view.get_traces());
  79
  80         QPainter p(this);
  81         p.setRenderHint(QPainter::Antialiasing);
  82
  83         if (_view.cursors_shown())
  84                 _view.cursors().draw_viewport_background(p, rect());
  85
  86         // Plot the signal
  87         for (const shared_ptr<Trace> t : traces)
  88         {
  89                 assert(t);
  90                 t->paint_back(p, 0, width());
  91         }
  92
  93         for (const shared_ptr<Trace> t : traces)
  94                 t->paint_mid(p, 0, width());
  95
  96         for (const shared_ptr<Trace> t : traces)
  97                 t->paint_fore(p, 0, width());
  98
  99         if (_view.cursors_shown())
 100                 _view.cursors().draw_viewport_foreground(p, rect());
 101
 102         p.end();
 103 }
 104
 105 bool Viewport::event(QEvent *event)
 106 {
 107         switch (event->type()) {
 108         case QEvent::TouchBegin:
 109         case QEvent::TouchUpdate:
 110         case QEvent::TouchEnd:
 111                 if (touchEvent(static_cast<QTouchEvent *>(event)))
 112                         return true;
 113                 break;
 114
 115         default:
 116                 break;
 117         }
 118
 119         return QWidget::event(event);
 120 }
 121
 122 void Viewport::mousePressEvent(QMouseEvent *event)
 123 {
 124         assert(event);
 125
 126         if (event->button() == Qt::LeftButton) {
 127                 _mouse_down_point = event->pos();
 128                 _mouse_down_offset = _view.offset();
 129                 _mouse_down_valid = true;
 130         }
 131 }
 132
 133 void Viewport::mouseReleaseEvent(QMouseEvent *event)
 134 {
 135         assert(event);
 136
 137         if (event->button() == Qt::LeftButton)
 138                 _mouse_down_valid = false;
 139 }
 140
 141 void Viewport::mouseMoveEvent(QMouseEvent *event)
 142 {
 143         assert(event);
 144
 145         if (event->buttons() & Qt::LeftButton) {
 146                 if (!_mouse_down_valid) {
 147                         _mouse_down_point = event->pos();
 148                         _mouse_down_offset = _view.offset();
 149                         _mouse_down_valid = true;
 150                 }
 151
 152                 _view.set_scale_offset(_view.scale(),
 153                         _mouse_down_offset +
 154                         (_mouse_down_point - event->pos()).x() *
 155                         _view.scale());
 156         }
 157 }
 158
 159 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
 160 {
 161         assert(event);
 162
 163         if (event->buttons() & Qt::LeftButton)
 164                 _view.zoom(2.0, event->x());
 165         else if (event->buttons() & Qt::RightButton)
 166                 _view.zoom(-2.0, event->x());
 167 }
 168
 169 void Viewport::wheelEvent(QWheelEvent *event)
 170 {
 171         assert(event);
 172
 173         if (event->orientation() == Qt::Vertical) {
 174                 // Vertical scrolling is interpreted as zooming in/out
 175                 _view.zoom(event->delta() / 120, event->x());
 176         } else if (event->orientation() == Qt::Horizontal) {
 177                 // Horizontal scrolling is interpreted as moving left/right
 178                 _view.set_scale_offset(_view.scale(),
 179                                        event->delta() * _view.scale()
 180                                        + _view.offset());
 181         }
 182 }
 183
 184 bool Viewport::touchEvent(QTouchEvent *event)
 185 {
 186         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
 187
 188         if (touchPoints.count() != 2) {
 189                 _pinch_zoom_active = false;
 190                 return false;
 191         }
 192
 193         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
 194         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
 195
 196         if (!_pinch_zoom_active ||
 197             (event->touchPointStates() & Qt::TouchPointPressed)) {
 198                 _pinch_offset0 = _view.offset() + _view.scale() * touchPoint0.pos().x();
 199                 _pinch_offset1 = _view.offset() + _view.scale() * touchPoint1.pos().x();
 200                 _pinch_zoom_active = true;
 201         }
 202
 203         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
 204         if (abs(w) >= 1.0) {
 205                 double scale = (_pinch_offset1 - _pinch_offset0) / w;
 206                 if (scale < 0)
 207                         scale = -scale;
 208                 double offset = _pinch_offset0 - touchPoint0.pos().x() * scale;
 209                 if (scale > 0)
 210                         _view.set_scale_offset(scale, offset);
 211         }
 212
 213         if (event->touchPointStates() & Qt::TouchPointReleased) {
 214                 _pinch_zoom_active = false;
 215
 216                 if (touchPoint0.state() & Qt::TouchPointReleased) {
 217                         // Primary touch released
 218                         _mouse_down_valid = false;
 219                 } else {
 220                         // Update the mouse down fields so that continued
 221                         // dragging with the primary touch will work correctly
 222                         _mouse_down_point = touchPoint0.pos().toPoint();
 223                         _mouse_down_offset = _view.offset();
 224                         _mouse_down_valid = true;
 225                 }
 226         }
 227
 228         return true;
 229 }
 230
 231 void Viewport::on_signals_changed()
 232 {
 233         const vector< shared_ptr<Trace> > traces(_view.get_traces());
 234         for (shared_ptr<Trace> t : traces) {
 235                 assert(t);
 236                 connect(t.get(), SIGNAL(visibility_changed()),
 237                         this, SLOT(update()));
 238         }
 239 }
 240
 241 void Viewport::on_signals_moved()
 242 {
 243         update();
 244 }
 245
 246 } // namespace view
 247 } // namespace pv