pv/views/trace/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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <algorithm>
  21 #include <cassert>
  22 #include <cmath>
  23 #include <limits>
  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 #include <QScreen>
  34 #include <QWindow>
  35
  36 #include <QDebug>
  37
  38 using std::abs;
  39 using std::back_inserter;
  40 using std::copy;
  41 using std::dynamic_pointer_cast;
  42 using std::none_of; // NOLINT. Used in assert()s.
  43 using std::shared_ptr;
  44 using std::stable_sort;
  45 using std::vector;
  46
  47 namespace pv {
  48 namespace views {
  49 namespace trace {
  50
  51 Viewport::Viewport(View &parent) :
  52         ViewWidget(parent),
  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 ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
  62         const vector< shared_ptr<ViewItem> > items(this->items());
  63         for (auto i = items.rbegin(); i != items.rend(); i++)
  64                 if ((*i)->enabled() && (*i)->hit_box_rect(pp).contains(pt))
  65                         return *i;
  66         return nullptr;
  67 }
  68
  69 void Viewport::item_hover(const shared_ptr<ViewItem> &item, QPoint pos)
  70 {
  71         if (item && item->is_draggable(pos))
  72                 setCursor(dynamic_pointer_cast<ViewItem>(item) ?
  73                         Qt::SizeVerCursor : Qt::SizeHorCursor);
  74         else
  75                 unsetCursor();
  76 }
  77
  78 void Viewport::drag()
  79 {
  80         drag_offset_ = view_.offset();
  81         drag_v_offset_ = view_.owner_visual_v_offset();
  82 }
  83
  84 void Viewport::drag_by(const QPoint &delta)
  85 {
  86         if (drag_offset_ == boost::none)
  87                 return;
  88
  89         view_.set_scale_offset(view_.scale(),
  90                 (*drag_offset_ - delta.x() * view_.scale()));
  91
  92         view_.set_v_offset(-drag_v_offset_ - delta.y());
  93 }
  94
  95 void Viewport::drag_release()
  96 {
  97         drag_offset_ = boost::none;
  98 }
  99
 100 vector< shared_ptr<ViewItem> > Viewport::items()
 101 {
 102         vector< shared_ptr<ViewItem> > items;
 103         const vector< shared_ptr<ViewItem> > view_items(
 104                 view_.list_by_type<ViewItem>());
 105         copy(view_items.begin(), view_items.end(), back_inserter(items));
 106         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 107         copy(time_items.begin(), time_items.end(), back_inserter(items));
 108         return items;
 109 }
 110
 111 bool Viewport::touch_event(QTouchEvent *event)
 112 {
 113         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
 114
 115         if (touchPoints.count() != 2) {
 116                 pinch_zoom_active_ = false;
 117                 return false;
 118         }
 119
 120         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
 121         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
 122
 123         if (!pinch_zoom_active_ ||
 124             (event->touchPointStates() & Qt::TouchPointPressed)) {
 125                 pinch_offset0_ = (view_.offset() + view_.scale() * touchPoint0.pos().x()).convert_to<double>();
 126                 pinch_offset1_ = (view_.offset() + view_.scale() * touchPoint1.pos().x()).convert_to<double>();
 127                 pinch_zoom_active_ = true;
 128         }
 129
 130         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
 131         if (abs(w) >= 1.0) {
 132                 const double scale =
 133                         fabs((pinch_offset1_ - pinch_offset0_) / w);
 134                 double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
 135                 if (scale > 0)
 136                         view_.set_scale_offset(scale, offset);
 137         }
 138
 139         if (event->touchPointStates() & Qt::TouchPointReleased) {
 140                 pinch_zoom_active_ = false;
 141
 142                 if (touchPoint0.state() & Qt::TouchPointReleased) {
 143                         // Primary touch released
 144                         drag_release();
 145                 } else {
 146                         // Update the mouse down fields so that continued
 147                         // dragging with the primary touch will work correctly
 148                         mouse_down_point_ = touchPoint0.pos().toPoint();
 149                         drag();
 150                 }
 151         }
 152
 153         return true;
 154 }
 155
 156 void Viewport::paintEvent(QPaintEvent*)
 157 {
 158         typedef void (ViewItem::*LayerPaintFunc)(
 159                 QPainter &p, ViewItemPaintParams &pp);
 160         LayerPaintFunc layer_paint_funcs[] = {
 161                 &ViewItem::paint_back, &ViewItem::paint_mid,
 162                 &ViewItem::paint_fore, nullptr};
 163
 164         vector< shared_ptr<ViewItem> > row_items(view_.list_by_type<ViewItem>());
 165         assert(none_of(row_items.begin(), row_items.end(),
 166                 [](const shared_ptr<ViewItem> &r) { return !r; }));
 167
 168         stable_sort(row_items.begin(), row_items.end(),
 169                 [](const shared_ptr<ViewItem> &a, const shared_ptr<ViewItem> &b) {
 170                         return a->drag_point(QRect()).y() < b->drag_point(QRect()).y(); });
 171
 172         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 173         assert(none_of(time_items.begin(), time_items.end(),
 174                 [](const shared_ptr<TimeItem> &t) { return !t; }));
 175
 176         QPainter p(this);
 177
 178         // Disable antialiasing for high-DPI displays
 179         bool use_antialiasing =
 180                 window()->windowHandle()->screen()->devicePixelRatio() < 2.0;
 181         p.setRenderHint(QPainter::Antialiasing, use_antialiasing);
 182
 183         for (LayerPaintFunc *paint_func = layer_paint_funcs;
 184                         *paint_func; paint_func++) {
 185                 ViewItemPaintParams time_pp(rect(), view_.scale(), view_.offset());
 186                 for (const shared_ptr<TimeItem>& t : time_items)
 187                         (t.get()->*(*paint_func))(p, time_pp);
 188
 189                 ViewItemPaintParams row_pp(rect(), view_.scale(), view_.offset());
 190                 for (const shared_ptr<ViewItem>& r : row_items)
 191                         (r.get()->*(*paint_func))(p, row_pp);
 192         }
 193
 194         p.end();
 195 }
 196
 197 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
 198 {
 199         assert(event);
 200
 201         if (event->buttons() & Qt::LeftButton)
 202                 view_.zoom(2.0, event->x());
 203         else if (event->buttons() & Qt::RightButton)
 204                 view_.zoom(-2.0, event->x());
 205 }
 206
 207 void Viewport::wheelEvent(QWheelEvent *event)
 208 {
 209         assert(event);
 210
 211         if (event->orientation() == Qt::Vertical) {
 212                 if (event->modifiers() & Qt::ControlModifier) {
 213                         // Vertical scrolling with the control key pressed
 214                         // is intrepretted as vertical scrolling
 215                         view_.set_v_offset(-view_.owner_visual_v_offset() -
 216                                 (event->delta() * height()) / (8 * 120));
 217                 } else {
 218                         // Vertical scrolling is interpreted as zooming in/out
 219                         view_.zoom(event->delta() / 120.0, event->x());
 220                 }
 221         } else if (event->orientation() == Qt::Horizontal) {
 222                 // Horizontal scrolling is interpreted as moving left/right
 223                 view_.set_scale_offset(view_.scale(),
 224                         event->delta() * view_.scale() + view_.offset());
 225         }
 226 }
 227
 228 } // namespace trace
 229 } // namespace views
 230 } // namespace pv