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