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 #include <algorithm>
  24
  25 #include "view.h"
  26 #include "viewport.h"
  27
  28 #include "signal.h"
  29 #include "../sigsession.h"
  30
  31 #include <QMouseEvent>
  32
  33 using std::abs;
  34 using std::max;
  35 using std::min;
  36 using std::shared_ptr;
  37 using std::stable_sort;
  38 using std::vector;
  39
  40 namespace pv {
  41 namespace view {
  42
  43 Viewport::Viewport(View &parent) :
  44         QWidget(&parent),
  45         _view(parent),
  46         _mouse_down_valid(false),
  47         _pinch_zoom_active(false)
  48 {
  49         setAttribute(Qt::WA_AcceptTouchEvents, true);
  50
  51         setMouseTracking(true);
  52         setAutoFillBackground(true);
  53         setBackgroundRole(QPalette::Base);
  54
  55         connect(&_view.session(), SIGNAL(signals_changed()),
  56                 this, SLOT(on_signals_changed()));
  57
  58         connect(&_view, SIGNAL(signals_moved()),
  59                 this, SLOT(on_signals_moved()));
  60
  61         // Trigger the initial event manually. The default device has signals
  62         // which were created before this object came into being
  63         on_signals_changed();
  64 }
  65
  66 int Viewport::get_total_height() const
  67 {
  68         int h = 0;
  69         const vector< shared_ptr<RowItem> > row_items(_view.child_items());
  70         for (const shared_ptr<RowItem> r : row_items) {
  71                 assert(r);
  72                 h = max(r->v_offset() + View::SignalHeight, h);
  73         }
  74
  75         return h;
  76 }
  77
  78 void Viewport::paintEvent(QPaintEvent*)
  79 {
  80         vector< shared_ptr<RowItem> > row_items(_view.child_items());
  81         stable_sort(row_items.begin(), row_items.end(),
  82                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
  83                         return a->v_offset() < b->v_offset(); });
  84
  85         QPainter p(this);
  86         p.setRenderHint(QPainter::Antialiasing);
  87
  88         if (_view.cursors_shown())
  89                 _view.cursors().draw_viewport_background(p, rect());
  90
  91         // Plot the signal
  92         for (const shared_ptr<RowItem> r : row_items)
  93         {
  94                 assert(r);
  95                 r->paint_back(p, 0, width());
  96         }
  97
  98         for (const shared_ptr<RowItem> r : row_items)
  99                 r->paint_mid(p, 0, width());
 100
 101         for (const shared_ptr<RowItem> r : row_items)
 102                 r->paint_fore(p, 0, width());
 103
 104         if (_view.cursors_shown())
 105                 _view.cursors().draw_viewport_foreground(p, rect());
 106
 107         p.end();
 108 }
 109
 110 bool Viewport::event(QEvent *event)
 111 {
 112         switch (event->type()) {
 113         case QEvent::TouchBegin:
 114         case QEvent::TouchUpdate:
 115         case QEvent::TouchEnd:
 116                 if (touchEvent(static_cast<QTouchEvent *>(event)))
 117                         return true;
 118                 break;
 119
 120         default:
 121                 break;
 122         }
 123
 124         return QWidget::event(event);
 125 }
 126
 127 void Viewport::mousePressEvent(QMouseEvent *event)
 128 {
 129         assert(event);
 130
 131         if (event->button() == Qt::LeftButton) {
 132                 _mouse_down_point = event->pos();
 133                 _mouse_down_offset = _view.offset();
 134                 _mouse_down_valid = true;
 135         }
 136 }
 137
 138 void Viewport::mouseReleaseEvent(QMouseEvent *event)
 139 {
 140         assert(event);
 141
 142         if (event->button() == Qt::LeftButton)
 143                 _mouse_down_valid = false;
 144 }
 145
 146 void Viewport::mouseMoveEvent(QMouseEvent *event)
 147 {
 148         assert(event);
 149
 150         if (event->buttons() & Qt::LeftButton) {
 151                 if (!_mouse_down_valid) {
 152                         _mouse_down_point = event->pos();
 153                         _mouse_down_offset = _view.offset();
 154                         _mouse_down_valid = true;
 155                 }
 156
 157                 _view.set_scale_offset(_view.scale(),
 158                         _mouse_down_offset +
 159                         (_mouse_down_point - event->pos()).x() *
 160                         _view.scale());
 161         }
 162 }
 163
 164 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
 165 {
 166         assert(event);
 167
 168         if (event->buttons() & Qt::LeftButton)
 169                 _view.zoom(2.0, event->x());
 170         else if (event->buttons() & Qt::RightButton)
 171                 _view.zoom(-2.0, event->x());
 172 }
 173
 174 void Viewport::wheelEvent(QWheelEvent *event)
 175 {
 176         assert(event);
 177
 178         if (event->orientation() == Qt::Vertical) {
 179                 // Vertical scrolling is interpreted as zooming in/out
 180                 _view.zoom(event->delta() / 120, event->x());
 181         } else if (event->orientation() == Qt::Horizontal) {
 182                 // Horizontal scrolling is interpreted as moving left/right
 183                 _view.set_scale_offset(_view.scale(),
 184                                        event->delta() * _view.scale()
 185                                        + _view.offset());
 186         }
 187 }
 188
 189 bool Viewport::touchEvent(QTouchEvent *event)
 190 {
 191         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
 192
 193         if (touchPoints.count() != 2) {
 194                 _pinch_zoom_active = false;
 195                 return false;
 196         }
 197
 198         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
 199         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
 200
 201         if (!_pinch_zoom_active ||
 202             (event->touchPointStates() & Qt::TouchPointPressed)) {
 203                 _pinch_offset0 = _view.offset() + _view.scale() * touchPoint0.pos().x();
 204                 _pinch_offset1 = _view.offset() + _view.scale() * touchPoint1.pos().x();
 205                 _pinch_zoom_active = true;
 206         }
 207
 208         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
 209         if (abs(w) >= 1.0) {
 210                 double scale = (_pinch_offset1 - _pinch_offset0) / w;
 211                 if (scale < 0)
 212                         scale = -scale;
 213                 double offset = _pinch_offset0 - touchPoint0.pos().x() * scale;
 214                 if (scale > 0)
 215                         _view.set_scale_offset(scale, offset);
 216         }
 217
 218         if (event->touchPointStates() & Qt::TouchPointReleased) {
 219                 _pinch_zoom_active = false;
 220
 221                 if (touchPoint0.state() & Qt::TouchPointReleased) {
 222                         // Primary touch released
 223                         _mouse_down_valid = false;
 224                 } else {
 225                         // Update the mouse down fields so that continued
 226                         // dragging with the primary touch will work correctly
 227                         _mouse_down_point = touchPoint0.pos().toPoint();
 228                         _mouse_down_offset = _view.offset();
 229                         _mouse_down_valid = true;
 230                 }
 231         }
 232
 233         return true;
 234 }
 235
 236 void Viewport::on_signals_changed()
 237 {
 238         const vector< shared_ptr<RowItem> > row_items(_view.child_items());
 239         for (shared_ptr<RowItem> r : row_items) {
 240                 assert(r);
 241                 connect(r.get(), SIGNAL(visibility_changed()),
 242                         this, SLOT(update()));
 243         }
 244 }
 245
 246 void Viewport::on_signals_moved()
 247 {
 248         update();
 249 }
 250
 251 } // namespace view
 252 } // namespace pv