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         // Set up settings and event handlers
  59         GlobalSettings settings;
  60         allow_vertical_dragging_ = settings.value(GlobalSettings::Key_View_AllowVerticalDragging).toBool();
  61
  62         GlobalSettings::add_change_handler(this);
  63 }
  64
  65 Viewport::~Viewport()
  66 {
  67         GlobalSettings::remove_change_handler(this);
  68 }
  69
  70 shared_ptr<ViewItem> Viewport::get_mouse_over_item(const QPoint &pt)
  71 {
  72         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
  73         const vector< shared_ptr<ViewItem> > items(this->items());
  74         for (auto i = items.rbegin(); i != items.rend(); i++)
  75                 if ((*i)->enabled() && (*i)->hit_box_rect(pp).contains(pt))
  76                         return *i;
  77         return nullptr;
  78 }
  79
  80 void Viewport::item_hover(const shared_ptr<ViewItem> &item, QPoint pos)
  81 {
  82         if (item && item->is_draggable(pos))
  83                 setCursor(dynamic_pointer_cast<ViewItem>(item) ?
  84                         Qt::SizeHorCursor : Qt::SizeVerCursor);
  85         else
  86                 unsetCursor();
  87 }
  88
  89 void Viewport::drag()
  90 {
  91         drag_offset_ = view_.offset();
  92
  93         if (allow_vertical_dragging_)
  94                 drag_v_offset_ = view_.owner_visual_v_offset();
  95 }
  96
  97 void Viewport::drag_by(const QPoint &delta)
  98 {
  99         if (drag_offset_ == boost::none)
 100                 return;
 101
 102         view_.set_scale_offset(view_.scale(),
 103                 (*drag_offset_ - delta.x() * view_.scale()));
 104
 105         if (allow_vertical_dragging_)
 106                 view_.set_v_offset(-drag_v_offset_ - delta.y());
 107 }
 108
 109 void Viewport::drag_release()
 110 {
 111         drag_offset_ = boost::none;
 112 }
 113
 114 vector< shared_ptr<ViewItem> > Viewport::items()
 115 {
 116         vector< shared_ptr<ViewItem> > items;
 117         const vector< shared_ptr<ViewItem> > view_items(
 118                 view_.list_by_type<ViewItem>());
 119         copy(view_items.begin(), view_items.end(), back_inserter(items));
 120         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 121         copy(time_items.begin(), time_items.end(), back_inserter(items));
 122         return items;
 123 }
 124
 125 bool Viewport::touch_event(QTouchEvent *event)
 126 {
 127         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
 128
 129         if (touchPoints.count() != 2) {
 130                 pinch_zoom_active_ = false;
 131                 return false;
 132         }
 133         if (event->device()->type() == QTouchDevice::TouchPad) {
 134                 return false;
 135         }
 136
 137         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
 138         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
 139
 140         if (!pinch_zoom_active_ ||
 141             (event->touchPointStates() & Qt::TouchPointPressed)) {
 142                 pinch_offset0_ = (view_.offset() + view_.scale() * touchPoint0.pos().x()).convert_to<double>();
 143                 pinch_offset1_ = (view_.offset() + view_.scale() * touchPoint1.pos().x()).convert_to<double>();
 144                 pinch_zoom_active_ = true;
 145         }
 146
 147         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
 148         if (abs(w) >= 1.0) {
 149                 const double scale =
 150                         fabs((pinch_offset1_ - pinch_offset0_) / w);
 151                 double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
 152                 if (scale > 0)
 153                         view_.set_scale_offset(scale, offset);
 154         }
 155
 156         if (event->touchPointStates() & Qt::TouchPointReleased) {
 157                 pinch_zoom_active_ = false;
 158
 159                 if (touchPoint0.state() & Qt::TouchPointReleased) {
 160                         // Primary touch released
 161                         drag_release();
 162                 } else {
 163                         // Update the mouse down fields so that continued
 164                         // dragging with the primary touch will work correctly
 165                         mouse_down_point_ = touchPoint0.pos().toPoint();
 166                         drag();
 167                 }
 168         }
 169
 170         return true;
 171 }
 172
 173 void Viewport::paintEvent(QPaintEvent*)
 174 {
 175         typedef void (ViewItem::*LayerPaintFunc)(
 176                 QPainter &p, ViewItemPaintParams &pp);
 177         LayerPaintFunc layer_paint_funcs[] = {
 178                 &ViewItem::paint_back, &ViewItem::paint_mid,
 179                 &ViewItem::paint_fore, nullptr};
 180
 181         vector< shared_ptr<ViewItem> > row_items(view_.list_by_type<ViewItem>());
 182         assert(none_of(row_items.begin(), row_items.end(),
 183                 [](const shared_ptr<ViewItem> &r) { return !r; }));
 184
 185         stable_sort(row_items.begin(), row_items.end(),
 186                 [](const shared_ptr<ViewItem> &a, const shared_ptr<ViewItem> &b) {
 187                         return a->drag_point(QRect()).y() < b->drag_point(QRect()).y(); });
 188
 189         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 190         assert(none_of(time_items.begin(), time_items.end(),
 191                 [](const shared_ptr<TimeItem> &t) { return !t; }));
 192
 193         QPainter p(this);
 194
 195         // Disable antialiasing for high-DPI displays
 196         bool use_antialiasing =
 197                 window()->windowHandle()->screen()->devicePixelRatio() < 2.0;
 198         p.setRenderHint(QPainter::Antialiasing, use_antialiasing);
 199
 200         for (LayerPaintFunc *paint_func = layer_paint_funcs;
 201                         *paint_func; paint_func++) {
 202                 ViewItemPaintParams time_pp(rect(), view_.scale(), view_.offset());
 203                 for (const shared_ptr<TimeItem>& t : time_items)
 204                         (t.get()->*(*paint_func))(p, time_pp);
 205
 206                 ViewItemPaintParams row_pp(rect(), view_.scale(), view_.offset());
 207                 for (const shared_ptr<ViewItem>& r : row_items)
 208                         (r.get()->*(*paint_func))(p, row_pp);
 209         }
 210
 211         p.end();
 212 }
 213
 214 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
 215 {
 216         assert(event);
 217
 218         if (event->buttons() & Qt::LeftButton)
 219                 view_.zoom(2.0, event->x());
 220         else if (event->buttons() & Qt::RightButton)
 221                 view_.zoom(-2.0, event->x());
 222 }
 223
 224 void Viewport::wheelEvent(QWheelEvent *event)
 225 {
 226         assert(event);
 227
 228         if (event->orientation() == Qt::Vertical) {
 229                 if (event->modifiers() & Qt::ControlModifier) {
 230                         // Vertical scrolling with the control key pressed
 231                         // is intrepretted as vertical scrolling
 232                         view_.set_v_offset(-view_.owner_visual_v_offset() -
 233                                 (event->delta() * height()) / (8 * 120));
 234                 } else {
 235                         // Vertical scrolling is interpreted as zooming in/out
 236                         view_.zoom(event->delta() / 120.0, event->x());
 237                 }
 238         } else if (event->orientation() == Qt::Horizontal) {
 239                 // Horizontal scrolling is interpreted as moving left/right
 240                 view_.set_scale_offset(view_.scale(),
 241                         event->delta() * view_.scale() + view_.offset());
 242         }
 243 }
 244
 245 void Viewport::on_setting_changed(const QString &key, const QVariant &value)
 246 {
 247         if (key == GlobalSettings::Key_View_AllowVerticalDragging) {
 248                 GlobalSettings settings;
 249                 allow_vertical_dragging_ = settings.value(GlobalSettings::Key_View_AllowVerticalDragging).toBool();
 250         }
 251 }
 252
 253 } // namespace trace
 254 } // namespace views
 255 } // namespace pv