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