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 #include <QDebug>
  36
  37 using std::abs;
  38 using std::back_inserter;
  39 using std::copy;
  40 using std::dynamic_pointer_cast;
  41 using std::max;
  42 using std::min;
  43 using std::none_of;
  44 using std::numeric_limits;
  45 using std::shared_ptr;
  46 using std::stable_sort;
  47 using std::vector;
  48
  49 namespace pv {
  50 namespace views {
  51 namespace TraceView {
  52
  53 Viewport::Viewport(View &parent) :
  54         ViewWidget(parent),
  55         pinch_zoom_active_(false)
  56 {
  57         setAutoFillBackground(true);
  58         setBackgroundRole(QPalette::Base);
  59 }
  60
  61 shared_ptr<ViewItem> Viewport::get_mouse_over_item(const QPoint &pt)
  62 {
  63         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
  64         const vector< shared_ptr<ViewItem> > items(this->items());
  65         for (auto i = items.rbegin(); i != items.rend(); i++)
  66                 if ((*i)->enabled() &&
  67                         (*i)->hit_box_rect(pp).contains(pt))
  68                         return *i;
  69         return nullptr;
  70 }
  71
  72 void Viewport::item_hover(const shared_ptr<ViewItem> &item)
  73 {
  74         if (item && item->is_draggable())
  75                 setCursor(dynamic_pointer_cast<RowItem>(item) ?
  76                         Qt::SizeVerCursor : Qt::SizeHorCursor);
  77         else
  78                 unsetCursor();
  79 }
  80
  81 void Viewport::drag()
  82 {
  83         drag_offset_ = view_.offset();
  84         drag_v_offset_ = view_.owner_visual_v_offset();
  85 }
  86
  87 void Viewport::drag_by(const QPoint &delta)
  88 {
  89         if (drag_offset_ == boost::none)
  90                 return;
  91
  92         view_.set_scale_offset(view_.scale(),
  93                 (*drag_offset_ - delta.x() * view_.scale()));
  94
  95         view_.set_v_offset(-drag_v_offset_ - delta.y());
  96 }
  97
  98 void Viewport::drag_release()
  99 {
 100         drag_offset_ = boost::none;
 101 }
 102
 103 vector< shared_ptr<ViewItem> > Viewport::items()
 104 {
 105         vector< shared_ptr<ViewItem> > items;
 106         const std::vector< shared_ptr<ViewItem> > view_items(
 107                 view_.list_by_type<ViewItem>());
 108         copy(view_items.begin(), view_items.end(), back_inserter(items));
 109         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 110         copy(time_items.begin(), time_items.end(), back_inserter(items));
 111         return items;
 112 }
 113
 114 bool Viewport::touch_event(QTouchEvent *event)
 115 {
 116         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
 117
 118         if (touchPoints.count() != 2) {
 119                 pinch_zoom_active_ = false;
 120                 return false;
 121         }
 122
 123         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
 124         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
 125
 126         if (!pinch_zoom_active_ ||
 127             (event->touchPointStates() & Qt::TouchPointPressed)) {
 128                 pinch_offset0_ = (view_.offset() + view_.scale() * touchPoint0.pos().x()).convert_to<double>();
 129                 pinch_offset1_ = (view_.offset() + view_.scale() * touchPoint1.pos().x()).convert_to<double>();
 130                 pinch_zoom_active_ = true;
 131         }
 132
 133         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
 134         if (abs(w) >= 1.0) {
 135                 const double scale =
 136                         fabs((pinch_offset1_ - pinch_offset0_) / w);
 137                 double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
 138                 if (scale > 0)
 139                         view_.set_scale_offset(scale, offset);
 140         }
 141
 142         if (event->touchPointStates() & Qt::TouchPointReleased) {
 143                 pinch_zoom_active_ = false;
 144
 145                 if (touchPoint0.state() & Qt::TouchPointReleased) {
 146                         // Primary touch released
 147                         drag_release();
 148                 } else {
 149                         // Update the mouse down fields so that continued
 150                         // dragging with the primary touch will work correctly
 151                         mouse_down_point_ = touchPoint0.pos().toPoint();
 152                         drag();
 153                 }
 154         }
 155
 156         return true;
 157 }
 158
 159 void Viewport::paintEvent(QPaintEvent*)
 160 {
 161         vector< shared_ptr<RowItem> > row_items(view_.list_by_type<RowItem>());
 162         assert(none_of(row_items.begin(), row_items.end(),
 163                 [](const shared_ptr<RowItem> &r) { return !r; }));
 164
 165         stable_sort(row_items.begin(), row_items.end(),
 166                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
 167                         return a->point(QRect()).y() < b->point(QRect()).y(); });
 168
 169         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 170         assert(none_of(time_items.begin(), time_items.end(),
 171                 [](const shared_ptr<TimeItem> &t) { return !t; }));
 172
 173         QPainter p(this);
 174         p.setRenderHint(QPainter::Antialiasing);
 175
 176         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
 177
 178         for (const shared_ptr<TimeItem> t : time_items)
 179                 t->paint_back(p, pp);
 180         for (const shared_ptr<RowItem> r : row_items)
 181                 r->paint_back(p, pp);
 182
 183         for (const shared_ptr<TimeItem> t : time_items)
 184                 t->paint_mid(p, pp);
 185         for (const shared_ptr<RowItem> r : row_items)
 186                 r->paint_mid(p, pp);
 187
 188         for (const shared_ptr<RowItem> r : row_items)
 189                 r->paint_fore(p, pp);
 190
 191         p.setRenderHint(QPainter::Antialiasing, false);
 192         for (const shared_ptr<TimeItem> t : time_items)
 193                 t->paint_fore(p, pp);
 194
 195         p.end();
 196 }
 197
 198 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
 199 {
 200         assert(event);
 201
 202         if (event->buttons() & Qt::LeftButton)
 203                 view_.zoom(2.0, event->x());
 204         else if (event->buttons() & Qt::RightButton)
 205                 view_.zoom(-2.0, event->x());
 206 }
 207
 208 void Viewport::wheelEvent(QWheelEvent *event)
 209 {
 210         assert(event);
 211
 212         if (event->orientation() == Qt::Vertical) {
 213                 if (event->modifiers() & Qt::ControlModifier) {
 214                         // Vertical scrolling with the control key pressed
 215                         // is intrepretted as vertical scrolling
 216                         view_.set_v_offset(-view_.owner_visual_v_offset() -
 217                                 (event->delta() * height()) / (8 * 120));
 218                 } else {
 219                         // Vertical scrolling is interpreted as zooming in/out
 220                         view_.zoom(event->delta() / 120, event->x());
 221                 }
 222         } else if (event->orientation() == Qt::Horizontal) {
 223                 // Horizontal scrolling is interpreted as moving left/right
 224                 view_.set_scale_offset(view_.scale(),
 225                         event->delta() * view_.scale() + view_.offset());
 226         }
 227 }
 228
 229 } // namespace TraceView
 230 } // namespace views
 231 } // namespace pv