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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <cassert>
  21 #include <cmath>
  22 #include <algorithm>
  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
  34 #include <QDebug>
  35
  36 using std::abs;
  37 using std::back_inserter;
  38 using std::copy;
  39 using std::dynamic_pointer_cast;
  40 using std::max;
  41 using std::min;
  42 using std::none_of;
  43 using std::numeric_limits;
  44 using std::shared_ptr;
  45 using std::stable_sort;
  46 using std::vector;
  47
  48 namespace pv {
  49 namespace views {
  50 namespace TraceView {
  51
  52 Viewport::Viewport(View &parent) :
  53         ViewWidget(parent),
  54         pinch_zoom_active_(false)
  55 {
  56         setAutoFillBackground(true);
  57         setBackgroundRole(QPalette::Base);
  58 }
  59
  60 shared_ptr<ViewItem> Viewport::get_mouse_over_item(const QPoint &pt)
  61 {
  62         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
  63         const vector< shared_ptr<ViewItem> > items(this->items());
  64         for (auto i = items.rbegin(); i != items.rend(); i++)
  65                 if ((*i)->enabled() &&
  66                         (*i)->hit_box_rect(pp).contains(pt))
  67                         return *i;
  68         return nullptr;
  69 }
  70
  71 void Viewport::item_hover(const shared_ptr<ViewItem> &item)
  72 {
  73         if (item && item->is_draggable())
  74                 setCursor(dynamic_pointer_cast<RowItem>(item) ?
  75                         Qt::SizeVerCursor : Qt::SizeHorCursor);
  76         else
  77                 unsetCursor();
  78 }
  79
  80 void Viewport::drag()
  81 {
  82         drag_offset_ = view_.offset();
  83         drag_v_offset_ = view_.owner_visual_v_offset();
  84 }
  85
  86 void Viewport::drag_by(const QPoint &delta)
  87 {
  88         if (drag_offset_ == boost::none)
  89                 return;
  90
  91         view_.set_scale_offset(view_.scale(),
  92                 (*drag_offset_ - delta.x() * view_.scale()));
  93
  94         view_.set_v_offset(-drag_v_offset_ - delta.y());
  95 }
  96
  97 void Viewport::drag_release()
  98 {
  99         drag_offset_ = boost::none;
 100 }
 101
 102 vector< shared_ptr<ViewItem> > Viewport::items()
 103 {
 104         vector< shared_ptr<ViewItem> > items;
 105         const std::vector< shared_ptr<ViewItem> > view_items(
 106                 view_.list_by_type<ViewItem>());
 107         copy(view_items.begin(), view_items.end(), back_inserter(items));
 108         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 109         copy(time_items.begin(), time_items.end(), back_inserter(items));
 110         return items;
 111 }
 112
 113 bool Viewport::touch_event(QTouchEvent *event)
 114 {
 115         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
 116
 117         if (touchPoints.count() != 2) {
 118                 pinch_zoom_active_ = false;
 119                 return false;
 120         }
 121
 122         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
 123         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
 124
 125         if (!pinch_zoom_active_ ||
 126             (event->touchPointStates() & Qt::TouchPointPressed)) {
 127                 pinch_offset0_ = (view_.offset() + view_.scale() * touchPoint0.pos().x()).convert_to<double>();
 128                 pinch_offset1_ = (view_.offset() + view_.scale() * touchPoint1.pos().x()).convert_to<double>();
 129                 pinch_zoom_active_ = true;
 130         }
 131
 132         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
 133         if (abs(w) >= 1.0) {
 134                 const double scale =
 135                         fabs((pinch_offset1_ - pinch_offset0_) / w);
 136                 double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
 137                 if (scale > 0)
 138                         view_.set_scale_offset(scale, offset);
 139         }
 140
 141         if (event->touchPointStates() & Qt::TouchPointReleased) {
 142                 pinch_zoom_active_ = false;
 143
 144                 if (touchPoint0.state() & Qt::TouchPointReleased) {
 145                         // Primary touch released
 146                         drag_release();
 147                 } else {
 148                         // Update the mouse down fields so that continued
 149                         // dragging with the primary touch will work correctly
 150                         mouse_down_point_ = touchPoint0.pos().toPoint();
 151                         drag();
 152                 }
 153         }
 154
 155         return true;
 156 }
 157
 158 void Viewport::paintEvent(QPaintEvent*)
 159 {
 160         vector< shared_ptr<RowItem> > row_items(view_.list_by_type<RowItem>());
 161         assert(none_of(row_items.begin(), row_items.end(),
 162                 [](const shared_ptr<RowItem> &r) { return !r; }));
 163
 164         stable_sort(row_items.begin(), row_items.end(),
 165                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
 166                         return a->point(QRect()).y() < b->point(QRect()).y(); });
 167
 168         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 169         assert(none_of(time_items.begin(), time_items.end(),
 170                 [](const shared_ptr<TimeItem> &t) { return !t; }));
 171
 172         QPainter p(this);
 173         p.setRenderHint(QPainter::Antialiasing);
 174
 175         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
 176
 177         for (const shared_ptr<TimeItem> t : time_items)
 178                 t->paint_back(p, pp);
 179         for (const shared_ptr<RowItem> r : row_items)
 180                 r->paint_back(p, pp);
 181
 182         for (const shared_ptr<TimeItem> t : time_items)
 183                 t->paint_mid(p, pp);
 184         for (const shared_ptr<RowItem> r : row_items)
 185                 r->paint_mid(p, pp);
 186
 187         for (const shared_ptr<RowItem> r : row_items)
 188                 r->paint_fore(p, pp);
 189
 190         p.setRenderHint(QPainter::Antialiasing, false);
 191         for (const shared_ptr<TimeItem> t : time_items)
 192                 t->paint_fore(p, pp);
 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, 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 TraceView
 229 } // namespace views
 230 } // namespace pv