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