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 #include <limits>
  25
  26 #include "signal.hpp"
  27 #include "view.hpp"
  28 #include "viewitempaintparams.hpp"
  29 #include "viewport.hpp"
  30
  31 #include <pv/session.hpp>
  32
  33 #include <QMouseEvent>
  34
  35 using std::abs;
  36 using std::back_inserter;
  37 using std::copy;
  38 using std::max;
  39 using std::min;
  40 using std::none_of;
  41 using std::numeric_limits;
  42 using std::shared_ptr;
  43 using std::stable_sort;
  44 using std::vector;
  45
  46 namespace pv {
  47 namespace view {
  48
  49 Viewport::Viewport(View &parent) :
  50         ViewWidget(parent),
  51         drag_offset_(numeric_limits<double>::signaling_NaN()),
  52         pinch_zoom_active_(false)
  53 {
  54         setAutoFillBackground(true);
  55         setBackgroundRole(QPalette::Base);
  56 }
  57
  58 shared_ptr<ViewItem> Viewport::get_mouse_over_item(const QPoint &pt)
  59 {
  60         const vector< shared_ptr<ViewItem> > items(this->items());
  61         for (auto i = items.rbegin(); i != items.rend(); i++)
  62                 if ((*i)->enabled() &&
  63                         (*i)->hit_box_rect(rect()).contains(pt))
  64                         return *i;
  65         return nullptr;
  66 }
  67
  68 void Viewport::drag()
  69 {
  70         drag_offset_ = view_.offset();
  71 }
  72
  73 void Viewport::drag_by(const QPoint &delta)
  74 {
  75         if (isnan(drag_offset_))
  76                 return;
  77
  78         view_.set_scale_offset(view_.scale(), drag_offset_ -
  79                 delta.x() * view_.scale());
  80 }
  81
  82 void Viewport::drag_release()
  83 {
  84         drag_offset_ = numeric_limits<double>::signaling_NaN();
  85 }
  86
  87 vector< shared_ptr<ViewItem> > Viewport::items()
  88 {
  89         vector< shared_ptr<ViewItem> > items(view_.begin(), view_.end());
  90         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
  91         copy(time_items.begin(), time_items.end(), back_inserter(items));
  92         return items;
  93 }
  94
  95 bool Viewport::touch_event(QTouchEvent *event)
  96 {
  97         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
  98
  99         if (touchPoints.count() != 2) {
 100                 pinch_zoom_active_ = false;
 101                 return false;
 102         }
 103
 104         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
 105         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
 106
 107         if (!pinch_zoom_active_ ||
 108             (event->touchPointStates() & Qt::TouchPointPressed)) {
 109                 pinch_offset0_ = view_.offset() + view_.scale() * touchPoint0.pos().x();
 110                 pinch_offset1_ = view_.offset() + view_.scale() * touchPoint1.pos().x();
 111                 pinch_zoom_active_ = true;
 112         }
 113
 114         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
 115         if (abs(w) >= 1.0) {
 116                 const double scale =
 117                         fabs((pinch_offset1_ - pinch_offset0_) / w);
 118                 double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
 119                 if (scale > 0)
 120                         view_.set_scale_offset(scale, offset);
 121         }
 122
 123         if (event->touchPointStates() & Qt::TouchPointReleased) {
 124                 pinch_zoom_active_ = false;
 125
 126                 if (touchPoint0.state() & Qt::TouchPointReleased) {
 127                         // Primary touch released
 128                         drag_release();
 129                 } else {
 130                         // Update the mouse down fields so that continued
 131                         // dragging with the primary touch will work correctly
 132                         mouse_down_point_ = touchPoint0.pos().toPoint();
 133                         drag();
 134                 }
 135         }
 136
 137         return true;
 138 }
 139
 140 void Viewport::paintEvent(QPaintEvent*)
 141 {
 142         vector< shared_ptr<RowItem> > row_items(view_.begin(), view_.end());
 143         assert(none_of(row_items.begin(), row_items.end(),
 144                 [](const shared_ptr<RowItem> &r) { return !r; }));
 145
 146         stable_sort(row_items.begin(), row_items.end(),
 147                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
 148                         return a->visual_v_offset() < b->visual_v_offset(); });
 149
 150         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 151         assert(none_of(time_items.begin(), time_items.end(),
 152                 [](const shared_ptr<TimeItem> &t) { return !t; }));
 153
 154         QPainter p(this);
 155         p.setRenderHint(QPainter::Antialiasing);
 156
 157         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
 158
 159         for (const shared_ptr<TimeItem> t : time_items)
 160                 t->paint_back(p, pp);
 161         for (const shared_ptr<RowItem> r : row_items)
 162                 r->paint_back(p, pp);
 163
 164         for (const shared_ptr<TimeItem> t : time_items)
 165                 t->paint_mid(p, pp);
 166         for (const shared_ptr<RowItem> r : row_items)
 167                 r->paint_mid(p, pp);
 168
 169         for (const shared_ptr<RowItem> r : row_items)
 170                 r->paint_fore(p, pp);
 171         for (const shared_ptr<TimeItem> t : time_items)
 172                 t->paint_fore(p, pp);
 173
 174         p.end();
 175 }
 176
 177 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
 178 {
 179         assert(event);
 180
 181         if (event->buttons() & Qt::LeftButton)
 182                 view_.zoom(2.0, event->x());
 183         else if (event->buttons() & Qt::RightButton)
 184                 view_.zoom(-2.0, event->x());
 185 }
 186
 187 void Viewport::wheelEvent(QWheelEvent *event)
 188 {
 189         assert(event);
 190
 191         if (event->orientation() == Qt::Vertical) {
 192                 // Vertical scrolling is interpreted as zooming in/out
 193                 view_.zoom(event->delta() / 120, event->x());
 194         } else if (event->orientation() == Qt::Horizontal) {
 195                 // Horizontal scrolling is interpreted as moving left/right
 196                 view_.set_scale_offset(view_.scale(),
 197                                        event->delta() * view_.scale()
 198                                        + view_.offset());
 199         }
 200 }
 201
 202 } // namespace view
 203 } // namespace pv