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::none_of; // Used in assert()s.
  41 using std::shared_ptr;
  42 using std::stable_sort;
  43 using std::vector;
  44
  45 namespace pv {
  46 namespace views {
  47 namespace TraceView {
  48
  49 Viewport::Viewport(View &parent) :
  50         ViewWidget(parent),
  51         pinch_zoom_active_(false)
  52 {
  53         setAutoFillBackground(true);
  54         setBackgroundRole(QPalette::Base);
  55 }
  56
  57 shared_ptr<ViewItem> Viewport::get_mouse_over_item(const QPoint &pt)
  58 {
  59         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
  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(pp).contains(pt))
  64                         return *i;
  65         return nullptr;
  66 }
  67
  68 void Viewport::item_hover(const shared_ptr<ViewItem> &item)
  69 {
  70         if (item && item->is_draggable())
  71                 setCursor(dynamic_pointer_cast<RowItem>(item) ?
  72                         Qt::SizeVerCursor : Qt::SizeHorCursor);
  73         else
  74                 unsetCursor();
  75 }
  76
  77 void Viewport::drag()
  78 {
  79         drag_offset_ = view_.offset();
  80         drag_v_offset_ = view_.owner_visual_v_offset();
  81 }
  82
  83 void Viewport::drag_by(const QPoint &delta)
  84 {
  85         if (drag_offset_ == boost::none)
  86                 return;
  87
  88         view_.set_scale_offset(view_.scale(),
  89                 (*drag_offset_ - delta.x() * view_.scale()));
  90
  91         view_.set_v_offset(-drag_v_offset_ - delta.y());
  92 }
  93
  94 void Viewport::drag_release()
  95 {
  96         drag_offset_ = boost::none;
  97 }
  98
  99 vector< shared_ptr<ViewItem> > Viewport::items()
 100 {
 101         vector< shared_ptr<ViewItem> > items;
 102         const vector< shared_ptr<ViewItem> > view_items(
 103                 view_.list_by_type<ViewItem>());
 104         copy(view_items.begin(), view_items.end(), back_inserter(items));
 105         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 106         copy(time_items.begin(), time_items.end(), back_inserter(items));
 107         return items;
 108 }
 109
 110 bool Viewport::touch_event(QTouchEvent *event)
 111 {
 112         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
 113
 114         if (touchPoints.count() != 2) {
 115                 pinch_zoom_active_ = false;
 116                 return false;
 117         }
 118
 119         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
 120         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
 121
 122         if (!pinch_zoom_active_ ||
 123             (event->touchPointStates() & Qt::TouchPointPressed)) {
 124                 pinch_offset0_ = (view_.offset() + view_.scale() * touchPoint0.pos().x()).convert_to<double>();
 125                 pinch_offset1_ = (view_.offset() + view_.scale() * touchPoint1.pos().x()).convert_to<double>();
 126                 pinch_zoom_active_ = true;
 127         }
 128
 129         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
 130         if (abs(w) >= 1.0) {
 131                 const double scale =
 132                         fabs((pinch_offset1_ - pinch_offset0_) / w);
 133                 double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
 134                 if (scale > 0)
 135                         view_.set_scale_offset(scale, offset);
 136         }
 137
 138         if (event->touchPointStates() & Qt::TouchPointReleased) {
 139                 pinch_zoom_active_ = false;
 140
 141                 if (touchPoint0.state() & Qt::TouchPointReleased) {
 142                         // Primary touch released
 143                         drag_release();
 144                 } else {
 145                         // Update the mouse down fields so that continued
 146                         // dragging with the primary touch will work correctly
 147                         mouse_down_point_ = touchPoint0.pos().toPoint();
 148                         drag();
 149                 }
 150         }
 151
 152         return true;
 153 }
 154
 155 void Viewport::paintEvent(QPaintEvent*)
 156 {
 157         vector< shared_ptr<RowItem> > row_items(view_.list_by_type<RowItem>());
 158         assert(none_of(row_items.begin(), row_items.end(),
 159                 [](const shared_ptr<RowItem> &r) { return !r; }));
 160
 161         stable_sort(row_items.begin(), row_items.end(),
 162                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
 163                         return a->point(QRect()).y() < b->point(QRect()).y(); });
 164
 165         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 166         assert(none_of(time_items.begin(), time_items.end(),
 167                 [](const shared_ptr<TimeItem> &t) { return !t; }));
 168
 169         QPainter p(this);
 170         p.setRenderHint(QPainter::Antialiasing);
 171
 172         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
 173
 174         for (const shared_ptr<TimeItem> t : time_items)
 175                 t->paint_back(p, pp);
 176         for (const shared_ptr<RowItem> r : row_items)
 177                 r->paint_back(p, pp);
 178
 179         for (const shared_ptr<TimeItem> t : time_items)
 180                 t->paint_mid(p, pp);
 181         for (const shared_ptr<RowItem> r : row_items)
 182                 r->paint_mid(p, pp);
 183
 184         for (const shared_ptr<RowItem> r : row_items)
 185                 r->paint_fore(p, pp);
 186
 187         p.setRenderHint(QPainter::Antialiasing, false);
 188         for (const shared_ptr<TimeItem> t : time_items)
 189                 t->paint_fore(p, pp);
 190
 191         p.end();
 192 }
 193
 194 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
 195 {
 196         assert(event);
 197
 198         if (event->buttons() & Qt::LeftButton)
 199                 view_.zoom(2.0, event->x());
 200         else if (event->buttons() & Qt::RightButton)
 201                 view_.zoom(-2.0, event->x());
 202 }
 203
 204 void Viewport::wheelEvent(QWheelEvent *event)
 205 {
 206         assert(event);
 207
 208         if (event->orientation() == Qt::Vertical) {
 209                 if (event->modifiers() & Qt::ControlModifier) {
 210                         // Vertical scrolling with the control key pressed
 211                         // is intrepretted as vertical scrolling
 212                         view_.set_v_offset(-view_.owner_visual_v_offset() -
 213                                 (event->delta() * height()) / (8 * 120));
 214                 } else {
 215                         // Vertical scrolling is interpreted as zooming in/out
 216                         view_.zoom(event->delta() / 120, event->x());
 217                 }
 218         } else if (event->orientation() == Qt::Horizontal) {
 219                 // Horizontal scrolling is interpreted as moving left/right
 220                 view_.set_scale_offset(view_.scale(),
 221                         event->delta() * view_.scale() + view_.offset());
 222         }
 223 }
 224
 225 } // namespace TraceView
 226 } // namespace views
 227 } // namespace pv