pv/views/trace/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 <algorithm>
  21 #include <cassert>
  22 #include <cmath>
  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; // NOLINT. 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 trace {
  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() && (*i)->hit_box_rect(pp).contains(pt))
  63                         return *i;
  64         return nullptr;
  65 }
  66
  67 void Viewport::item_hover(const shared_ptr<ViewItem> &item)
  68 {
  69         if (item && item->is_draggable())
  70                 setCursor(dynamic_pointer_cast<RowItem>(item) ?
  71                         Qt::SizeVerCursor : Qt::SizeHorCursor);
  72         else
  73                 unsetCursor();
  74 }
  75
  76 void Viewport::drag()
  77 {
  78         drag_offset_ = view_.offset();
  79         drag_v_offset_ = view_.owner_visual_v_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         view_.set_v_offset(-drag_v_offset_ - delta.y());
  91 }
  92
  93 void Viewport::drag_release()
  94 {
  95         drag_offset_ = boost::none;
  96 }
  97
  98 vector< shared_ptr<ViewItem> > Viewport::items()
  99 {
 100         vector< shared_ptr<ViewItem> > items;
 101         const vector< shared_ptr<ViewItem> > view_items(
 102                 view_.list_by_type<ViewItem>());
 103         copy(view_items.begin(), view_items.end(), back_inserter(items));
 104         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 105         copy(time_items.begin(), time_items.end(), back_inserter(items));
 106         return items;
 107 }
 108
 109 bool Viewport::touch_event(QTouchEvent *event)
 110 {
 111         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
 112
 113         if (touchPoints.count() != 2) {
 114                 pinch_zoom_active_ = false;
 115                 return false;
 116         }
 117
 118         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
 119         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
 120
 121         if (!pinch_zoom_active_ ||
 122             (event->touchPointStates() & Qt::TouchPointPressed)) {
 123                 pinch_offset0_ = (view_.offset() + view_.scale() * touchPoint0.pos().x()).convert_to<double>();
 124                 pinch_offset1_ = (view_.offset() + view_.scale() * touchPoint1.pos().x()).convert_to<double>();
 125                 pinch_zoom_active_ = true;
 126         }
 127
 128         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
 129         if (abs(w) >= 1.0) {
 130                 const double scale =
 131                         fabs((pinch_offset1_ - pinch_offset0_) / w);
 132                 double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
 133                 if (scale > 0)
 134                         view_.set_scale_offset(scale, offset);
 135         }
 136
 137         if (event->touchPointStates() & Qt::TouchPointReleased) {
 138                 pinch_zoom_active_ = false;
 139
 140                 if (touchPoint0.state() & Qt::TouchPointReleased) {
 141                         // Primary touch released
 142                         drag_release();
 143                 } else {
 144                         // Update the mouse down fields so that continued
 145                         // dragging with the primary touch will work correctly
 146                         mouse_down_point_ = touchPoint0.pos().toPoint();
 147                         drag();
 148                 }
 149         }
 150
 151         return true;
 152 }
 153
 154 void Viewport::paintEvent(QPaintEvent*)
 155 {
 156         typedef void (ViewItem::*LayerPaintFunc)(
 157                 QPainter &p, ViewItemPaintParams &pp);
 158         LayerPaintFunc layer_paint_funcs[] = {
 159                 &ViewItem::paint_back, &ViewItem::paint_mid,
 160                 &ViewItem::paint_fore, nullptr};
 161
 162         vector< shared_ptr<RowItem> > row_items(view_.list_by_type<RowItem>());
 163         assert(none_of(row_items.begin(), row_items.end(),
 164                 [](const shared_ptr<RowItem> &r) { return !r; }));
 165
 166         stable_sort(row_items.begin(), row_items.end(),
 167                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
 168                         return a->drag_point(QRect()).y() < b->drag_point(QRect()).y(); });
 169
 170         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 171         assert(none_of(time_items.begin(), time_items.end(),
 172                 [](const shared_ptr<TimeItem> &t) { return !t; }));
 173
 174         QPainter p(this);
 175         p.setRenderHint(QPainter::Antialiasing);
 176
 177         for (LayerPaintFunc *paint_func = layer_paint_funcs;
 178                         *paint_func; paint_func++) {
 179                 ViewItemPaintParams time_pp(rect(), view_.scale(), view_.offset());
 180                 for (const shared_ptr<TimeItem> t : time_items)
 181                         (t.get()->*(*paint_func))(p, time_pp);
 182
 183                 ViewItemPaintParams row_pp(rect(), view_.scale(), view_.offset());
 184                 for (const shared_ptr<RowItem> r : row_items)
 185                         (r.get()->*(*paint_func))(p, row_pp);
 186         }
 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 *event)
 202 {
 203         assert(event);
 204
 205         if (event->orientation() == Qt::Vertical) {
 206                 if (event->modifiers() & Qt::ControlModifier) {
 207                         // Vertical scrolling with the control key pressed
 208                         // is intrepretted as vertical scrolling
 209                         view_.set_v_offset(-view_.owner_visual_v_offset() -
 210                                 (event->delta() * height()) / (8 * 120));
 211                 } else {
 212                         // Vertical scrolling is interpreted as zooming in/out
 213                         view_.zoom(event->delta() / 120.0, event->x());
 214                 }
 215         } else if (event->orientation() == Qt::Horizontal) {
 216                 // Horizontal scrolling is interpreted as moving left/right
 217                 view_.set_scale_offset(view_.scale(),
 218                         event->delta() * view_.scale() + view_.offset());
 219         }
 220 }
 221
 222 } // namespace trace
 223 } // namespace views
 224 } // namespace pv