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