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