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 "signal.hpp"
  26 #include "view.hpp"
  27 #include "viewitempaintparams.hpp"
  28 #include "viewport.hpp"
  29
  30 #include <pv/session.hpp>
  31
  32 #include <QMouseEvent>
  33
  34 using std::abs;
  35 using std::max;
  36 using std::min;
  37 using std::none_of;
  38 using std::shared_ptr;
  39 using std::stable_sort;
  40 using std::vector;
  41
  42 namespace pv {
  43 namespace view {
  44
  45 Viewport::Viewport(View &parent) :
  46         QWidget(&parent),
  47         view_(parent),
  48         mouse_down_valid_(false),
  49         pinch_zoom_active_(false)
  50 {
  51         setAttribute(Qt::WA_AcceptTouchEvents, true);
  52
  53         setMouseTracking(true);
  54         setAutoFillBackground(true);
  55         setBackgroundRole(QPalette::Base);
  56
  57         connect(&view_, SIGNAL(signals_moved()),
  58                 this, SLOT(on_signals_moved()));
  59 }
  60
  61 void Viewport::paintEvent(QPaintEvent*)
  62 {
  63         vector< shared_ptr<RowItem> > row_items(view_.begin(), view_.end());
  64         assert(none_of(row_items.begin(), row_items.end(),
  65                 [](const shared_ptr<RowItem> &r) { return !r; }));
  66
  67         stable_sort(row_items.begin(), row_items.end(),
  68                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
  69                         return a->visual_v_offset() < b->visual_v_offset(); });
  70
  71         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
  72         assert(none_of(time_items.begin(), time_items.end(),
  73                 [](const shared_ptr<TimeItem> &t) { return !t; }));
  74
  75         QPainter p(this);
  76         p.setRenderHint(QPainter::Antialiasing);
  77
  78         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
  79
  80         for (const shared_ptr<TimeItem> t : time_items)
  81                 t->paint_back(p, pp);
  82         for (const shared_ptr<RowItem> r : row_items)
  83                 r->paint_back(p, pp);
  84
  85         for (const shared_ptr<TimeItem> t : time_items)
  86                 t->paint_mid(p, pp);
  87         for (const shared_ptr<RowItem> r : row_items)
  88                 r->paint_mid(p, pp);
  89
  90         for (const shared_ptr<RowItem> r : row_items)
  91                 r->paint_fore(p, pp);
  92         for (const shared_ptr<TimeItem> t : time_items)
  93                 t->paint_fore(p, pp);
  94
  95         p.end();
  96 }
  97
  98 bool Viewport::event(QEvent *event)
  99 {
 100         switch (event->type()) {
 101         case QEvent::TouchBegin:
 102         case QEvent::TouchUpdate:
 103         case QEvent::TouchEnd:
 104                 if (touchEvent(static_cast<QTouchEvent *>(event)))
 105                         return true;
 106                 break;
 107
 108         default:
 109                 break;
 110         }
 111
 112         return QWidget::event(event);
 113 }
 114
 115 void Viewport::mousePressEvent(QMouseEvent *event)
 116 {
 117         assert(event);
 118
 119         if (event->button() == Qt::LeftButton) {
 120                 mouse_down_point_ = event->pos();
 121                 mouse_down_offset_ = view_.offset();
 122                 mouse_down_valid_ = true;
 123         }
 124 }
 125
 126 void Viewport::mouseReleaseEvent(QMouseEvent *event)
 127 {
 128         assert(event);
 129
 130         if (event->button() == Qt::LeftButton)
 131                 mouse_down_valid_ = false;
 132 }
 133
 134 void Viewport::mouseMoveEvent(QMouseEvent *event)
 135 {
 136         assert(event);
 137
 138         if (event->buttons() & Qt::LeftButton) {
 139                 if (!mouse_down_valid_) {
 140                         mouse_down_point_ = event->pos();
 141                         mouse_down_offset_ = view_.offset();
 142                         mouse_down_valid_ = true;
 143                 }
 144
 145                 view_.set_scale_offset(view_.scale(),
 146                         mouse_down_offset_ +
 147                         (mouse_down_point_ - event->pos()).x() *
 148                         view_.scale());
 149         }
 150 }
 151
 152 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
 153 {
 154         assert(event);
 155
 156         if (event->buttons() & Qt::LeftButton)
 157                 view_.zoom(2.0, event->x());
 158         else if (event->buttons() & Qt::RightButton)
 159                 view_.zoom(-2.0, event->x());
 160 }
 161
 162 void Viewport::wheelEvent(QWheelEvent *event)
 163 {
 164         assert(event);
 165
 166         if (event->orientation() == Qt::Vertical) {
 167                 // Vertical scrolling is interpreted as zooming in/out
 168                 view_.zoom(event->delta() / 120, event->x());
 169         } else if (event->orientation() == Qt::Horizontal) {
 170                 // Horizontal scrolling is interpreted as moving left/right
 171                 view_.set_scale_offset(view_.scale(),
 172                                        event->delta() * view_.scale()
 173                                        + view_.offset());
 174         }
 175 }
 176
 177 bool Viewport::touchEvent(QTouchEvent *event)
 178 {
 179         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
 180
 181         if (touchPoints.count() != 2) {
 182                 pinch_zoom_active_ = false;
 183                 return false;
 184         }
 185
 186         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
 187         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
 188
 189         if (!pinch_zoom_active_ ||
 190             (event->touchPointStates() & Qt::TouchPointPressed)) {
 191                 pinch_offset0_ = view_.offset() + view_.scale() * touchPoint0.pos().x();
 192                 pinch_offset1_ = view_.offset() + view_.scale() * touchPoint1.pos().x();
 193                 pinch_zoom_active_ = true;
 194         }
 195
 196         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
 197         if (abs(w) >= 1.0) {
 198                 double scale = (pinch_offset1_ - pinch_offset0_) / w;
 199                 if (scale < 0)
 200                         scale = -scale;
 201                 double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
 202                 if (scale > 0)
 203                         view_.set_scale_offset(scale, offset);
 204         }
 205
 206         if (event->touchPointStates() & Qt::TouchPointReleased) {
 207                 pinch_zoom_active_ = false;
 208
 209                 if (touchPoint0.state() & Qt::TouchPointReleased) {
 210                         // Primary touch released
 211                         mouse_down_valid_ = false;
 212                 } else {
 213                         // Update the mouse down fields so that continued
 214                         // dragging with the primary touch will work correctly
 215                         mouse_down_point_ = touchPoint0.pos().toPoint();
 216                         mouse_down_offset_ = view_.offset();
 217                         mouse_down_valid_ = true;
 218                 }
 219         }
 220
 221         return true;
 222 }
 223
 224 void Viewport::on_signals_moved()
 225 {
 226         update();
 227 }
 228
 229 } // namespace view
 230 } // namespace pv