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         pinch_zoom_active_(false)
  53 {
  54         setAutoFillBackground(true);
  55         setBackgroundRole(QPalette::Base);
  56 }
  57
  58 shared_ptr<ViewItem> Viewport::get_mouse_over_item(const QPoint &pt)
  59 {
  60         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
  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(pp).contains(pt))
  65                         return *i;
  66         return nullptr;
  67 }
  68
  69 void Viewport::item_hover(const shared_ptr<ViewItem> &item)
  70 {
  71         if (item && item->is_draggable())
  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         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 std::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         vector< shared_ptr<RowItem> > row_items(view_.list_by_type<RowItem>());
 159         assert(none_of(row_items.begin(), row_items.end(),
 160                 [](const shared_ptr<RowItem> &r) { return !r; }));
 161
 162         stable_sort(row_items.begin(), row_items.end(),
 163                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
 164                         return a->point(QRect()).y() < b->point(QRect()).y(); });
 165
 166         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 167         assert(none_of(time_items.begin(), time_items.end(),
 168                 [](const shared_ptr<TimeItem> &t) { return !t; }));
 169
 170         QPainter p(this);
 171         p.setRenderHint(QPainter::Antialiasing);
 172
 173         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
 174
 175         for (const shared_ptr<TimeItem> t : time_items)
 176                 t->paint_back(p, pp);
 177         for (const shared_ptr<RowItem> r : row_items)
 178                 r->paint_back(p, pp);
 179
 180         for (const shared_ptr<TimeItem> t : time_items)
 181                 t->paint_mid(p, pp);
 182         for (const shared_ptr<RowItem> r : row_items)
 183                 r->paint_mid(p, pp);
 184
 185         for (const shared_ptr<RowItem> r : row_items)
 186                 r->paint_fore(p, pp);
 187
 188         p.setRenderHint(QPainter::Antialiasing, false);
 189         for (const shared_ptr<TimeItem> t : time_items)
 190                 t->paint_fore(p, pp);
 191
 192         p.end();
 193 }
 194
 195 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
 196 {
 197         assert(event);
 198
 199         if (event->buttons() & Qt::LeftButton)
 200                 view_.zoom(2.0, event->x());
 201         else if (event->buttons() & Qt::RightButton)
 202                 view_.zoom(-2.0, event->x());
 203 }
 204
 205 void Viewport::wheelEvent(QWheelEvent *e)
 206 {
 207         assert(e);
 208
 209         if (e->orientation() == Qt::Vertical) {
 210                 if (e->modifiers() & Qt::ControlModifier) {
 211                         // Vertical scrolling with the control key pressed
 212                         // is intrepretted as vertical scrolling
 213                         view_.set_v_offset(-view_.owner_visual_v_offset() -
 214                                 (e->delta() * height()) / (8 * 120));
 215                 } else {
 216                         // Vertical scrolling is interpreted as zooming in/out
 217                         view_.zoom(e->delta() / 120, e->x());
 218                 }
 219         } else if (e->orientation() == Qt::Horizontal) {
 220                 // Horizontal scrolling is interpreted as moving left/right
 221                 view_.set_scale_offset(view_.scale(),
 222                         e->delta() * view_.scale() + view_.offset());
 223         }
 224 }
 225
 226 } // namespace view
 227 } // namespace pv