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