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::dynamic_pointer_cast;
  39 using std::max;
  40 using std::min;
  41 using std::none_of;
  42 using std::numeric_limits;
  43 using std::shared_ptr;
  44 using std::stable_sort;
  45 using std::vector;
  46
  47 namespace pv {
  48 namespace view {
  49
  50 Viewport::Viewport(View &parent) :
  51         ViewWidget(parent),
  52         drag_offset_(numeric_limits<double>::signaling_NaN()),
  53         pinch_zoom_active_(false)
  54 {
  55         setAutoFillBackground(true);
  56         setBackgroundRole(QPalette::Base);
  57 }
  58
  59 shared_ptr<ViewItem> Viewport::get_mouse_over_item(const QPoint &pt)
  60 {
  61         const vector< shared_ptr<ViewItem> > items(this->items());
  62         for (auto i = items.rbegin(); i != items.rend(); i++)
  63                 if ((*i)->enabled() &&
  64                         (*i)->hit_box_rect(rect()).contains(pt))
  65                         return *i;
  66         return nullptr;
  67 }
  68
  69 void Viewport::item_hover(const shared_ptr<ViewItem> &item)
  70 {
  71         if (item)
  72                 setCursor(dynamic_pointer_cast<RowItem>(item) ?
  73                         Qt::SizeVerCursor : Qt::SizeHorCursor);
  74         else
  75                 unsetCursor();
  76 }
  77
  78 void Viewport::drag()
  79 {
  80         drag_offset_ = view_.offset();
  81 }
  82
  83 void Viewport::drag_by(const QPoint &delta)
  84 {
  85         // Use std::isnan() instead of isnan(), the latter can cause issues.
  86         if (std::isnan(drag_offset_))
  87                 return;
  88
  89         view_.set_scale_offset(view_.scale(), drag_offset_ -
  90                 delta.x() * view_.scale());
  91 }
  92
  93 void Viewport::drag_release()
  94 {
  95         drag_offset_ = numeric_limits<double>::signaling_NaN();
  96 }
  97
  98 vector< shared_ptr<ViewItem> > Viewport::items()
  99 {
 100         vector< shared_ptr<ViewItem> > items(view_.begin(), view_.end());
 101         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 102         copy(time_items.begin(), time_items.end(), back_inserter(items));
 103         return items;
 104 }
 105
 106 bool Viewport::touch_event(QTouchEvent *event)
 107 {
 108         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
 109
 110         if (touchPoints.count() != 2) {
 111                 pinch_zoom_active_ = false;
 112                 return false;
 113         }
 114
 115         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
 116         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
 117
 118         if (!pinch_zoom_active_ ||
 119             (event->touchPointStates() & Qt::TouchPointPressed)) {
 120                 pinch_offset0_ = view_.offset() + view_.scale() * touchPoint0.pos().x();
 121                 pinch_offset1_ = view_.offset() + view_.scale() * touchPoint1.pos().x();
 122                 pinch_zoom_active_ = true;
 123         }
 124
 125         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
 126         if (abs(w) >= 1.0) {
 127                 const double scale =
 128                         fabs((pinch_offset1_ - pinch_offset0_) / w);
 129                 double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
 130                 if (scale > 0)
 131                         view_.set_scale_offset(scale, offset);
 132         }
 133
 134         if (event->touchPointStates() & Qt::TouchPointReleased) {
 135                 pinch_zoom_active_ = false;
 136
 137                 if (touchPoint0.state() & Qt::TouchPointReleased) {
 138                         // Primary touch released
 139                         drag_release();
 140                 } else {
 141                         // Update the mouse down fields so that continued
 142                         // dragging with the primary touch will work correctly
 143                         mouse_down_point_ = touchPoint0.pos().toPoint();
 144                         drag();
 145                 }
 146         }
 147
 148         return true;
 149 }
 150
 151 void Viewport::paintEvent(QPaintEvent*)
 152 {
 153         vector< shared_ptr<RowItem> > row_items(view_.begin(), view_.end());
 154         assert(none_of(row_items.begin(), row_items.end(),
 155                 [](const shared_ptr<RowItem> &r) { return !r; }));
 156
 157         stable_sort(row_items.begin(), row_items.end(),
 158                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
 159                         return a->visual_v_offset() < b->visual_v_offset(); });
 160
 161         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 162         assert(none_of(time_items.begin(), time_items.end(),
 163                 [](const shared_ptr<TimeItem> &t) { return !t; }));
 164
 165         QPainter p(this);
 166         p.setRenderHint(QPainter::Antialiasing);
 167
 168         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
 169
 170         for (const shared_ptr<TimeItem> t : time_items)
 171                 t->paint_back(p, pp);
 172         for (const shared_ptr<RowItem> r : row_items)
 173                 r->paint_back(p, pp);
 174
 175         for (const shared_ptr<TimeItem> t : time_items)
 176                 t->paint_mid(p, pp);
 177         for (const shared_ptr<RowItem> r : row_items)
 178                 r->paint_mid(p, pp);
 179
 180         for (const shared_ptr<RowItem> r : row_items)
 181                 r->paint_fore(p, pp);
 182         for (const shared_ptr<TimeItem> t : time_items)
 183                 t->paint_fore(p, pp);
 184
 185         p.end();
 186 }
 187
 188 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
 189 {
 190         assert(event);
 191
 192         if (event->buttons() & Qt::LeftButton)
 193                 view_.zoom(2.0, event->x());
 194         else if (event->buttons() & Qt::RightButton)
 195                 view_.zoom(-2.0, event->x());
 196 }
 197
 198 void Viewport::wheelEvent(QWheelEvent *e)
 199 {
 200         assert(e);
 201
 202         if (e->orientation() == Qt::Vertical)
 203         {
 204                 if (e->modifiers() & Qt::ControlModifier) {
 205                         // Vertical scrolling with the control key pressed
 206                         // is intrepretted as vertical scrolling
 207                         view_.set_v_offset(-view_.owner_visual_v_offset() -
 208                                 (e->delta() * height()) / (8 * 120));
 209                 } else {
 210                         // Vertical scrolling is interpreted as zooming in/out
 211                         view_.zoom(e->delta() / 120, e->x());
 212                 }
 213         }
 214         else if (e->orientation() == Qt::Horizontal)
 215         {
 216                 // Horizontal scrolling is interpreted as moving left/right
 217                 view_.set_scale_offset(view_.scale(),
 218                         e->delta() * view_.scale() + view_.offset());
 219         }
 220 }
 221
 222 } // namespace view
 223 } // namespace pv