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