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
  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 using std::abs;
  35 using std::back_inserter;
  36 using std::copy;
  37 using std::max;
  38 using std::min;
  39 using std::none_of;
  40 using std::shared_ptr;
  41 using std::stable_sort;
  42 using std::vector;
  43
  44 namespace pv {
  45 namespace view {
  46
  47 Viewport::Viewport(View &parent) :
  48         ViewWidget(parent),
  49         mouse_down_valid_(false),
  50         pinch_zoom_active_(false)
  51 {
  52         setAutoFillBackground(true);
  53         setBackgroundRole(QPalette::Base);
  54 }
  55
  56 shared_ptr<ViewItem> Viewport::get_mouse_over_item(const QPoint &pt)
  57 {
  58         const vector< shared_ptr<ViewItem> > items(this->items());
  59         for (auto i = items.rbegin(); i != items.rend(); i++)
  60                 if ((*i)->enabled() &&
  61                         (*i)->hit_box_rect(rect()).contains(pt))
  62                         return *i;
  63         return nullptr;
  64 }
  65
  66 vector< shared_ptr<ViewItem> > Viewport::items()
  67 {
  68         vector< shared_ptr<ViewItem> > items(view_.begin(), view_.end());
  69         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
  70         copy(time_items.begin(), time_items.end(), back_inserter(items));
  71         return items;
  72 }
  73
  74 bool Viewport::touch_event(QTouchEvent *event)
  75 {
  76         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
  77
  78         if (touchPoints.count() != 2) {
  79                 pinch_zoom_active_ = false;
  80                 return false;
  81         }
  82
  83         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
  84         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
  85
  86         if (!pinch_zoom_active_ ||
  87             (event->touchPointStates() & Qt::TouchPointPressed)) {
  88                 pinch_offset0_ = view_.offset() + view_.scale() * touchPoint0.pos().x();
  89                 pinch_offset1_ = view_.offset() + view_.scale() * touchPoint1.pos().x();
  90                 pinch_zoom_active_ = true;
  91         }
  92
  93         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
  94         if (abs(w) >= 1.0) {
  95                 double scale = (pinch_offset1_ - pinch_offset0_) / w;
  96                 if (scale < 0)
  97                         scale = -scale;
  98                 double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
  99                 if (scale > 0)
 100                         view_.set_scale_offset(scale, offset);
 101         }
 102
 103         if (event->touchPointStates() & Qt::TouchPointReleased) {
 104                 pinch_zoom_active_ = false;
 105
 106                 if (touchPoint0.state() & Qt::TouchPointReleased) {
 107                         // Primary touch released
 108                         mouse_down_valid_ = false;
 109                 } else {
 110                         // Update the mouse down fields so that continued
 111                         // dragging with the primary touch will work correctly
 112                         mouse_down_point_ = touchPoint0.pos().toPoint();
 113                         mouse_down_offset_ = view_.offset();
 114                         mouse_down_valid_ = true;
 115                 }
 116         }
 117
 118         return true;
 119 }
 120
 121 void Viewport::paintEvent(QPaintEvent*)
 122 {
 123         vector< shared_ptr<RowItem> > row_items(view_.begin(), view_.end());
 124         assert(none_of(row_items.begin(), row_items.end(),
 125                 [](const shared_ptr<RowItem> &r) { return !r; }));
 126
 127         stable_sort(row_items.begin(), row_items.end(),
 128                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
 129                         return a->visual_v_offset() < b->visual_v_offset(); });
 130
 131         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
 132         assert(none_of(time_items.begin(), time_items.end(),
 133                 [](const shared_ptr<TimeItem> &t) { return !t; }));
 134
 135         QPainter p(this);
 136         p.setRenderHint(QPainter::Antialiasing);
 137
 138         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
 139
 140         for (const shared_ptr<TimeItem> t : time_items)
 141                 t->paint_back(p, pp);
 142         for (const shared_ptr<RowItem> r : row_items)
 143                 r->paint_back(p, pp);
 144
 145         for (const shared_ptr<TimeItem> t : time_items)
 146                 t->paint_mid(p, pp);
 147         for (const shared_ptr<RowItem> r : row_items)
 148                 r->paint_mid(p, pp);
 149
 150         for (const shared_ptr<RowItem> r : row_items)
 151                 r->paint_fore(p, pp);
 152         for (const shared_ptr<TimeItem> t : time_items)
 153                 t->paint_fore(p, pp);
 154
 155         p.end();
 156 }
 157
 158 void Viewport::mousePressEvent(QMouseEvent *event)
 159 {
 160         assert(event);
 161
 162         if (event->button() == Qt::LeftButton) {
 163                 mouse_down_point_ = event->pos();
 164                 mouse_down_offset_ = view_.offset();
 165                 mouse_down_valid_ = true;
 166         }
 167 }
 168
 169 void Viewport::mouseReleaseEvent(QMouseEvent *event)
 170 {
 171         assert(event);
 172
 173         if (event->button() == Qt::LeftButton)
 174                 mouse_down_valid_ = false;
 175 }
 176
 177 void Viewport::mouseMoveEvent(QMouseEvent *event)
 178 {
 179         assert(event);
 180
 181         if (event->buttons() & Qt::LeftButton) {
 182                 if (!mouse_down_valid_) {
 183                         mouse_down_point_ = event->pos();
 184                         mouse_down_offset_ = view_.offset();
 185                         mouse_down_valid_ = true;
 186                 }
 187
 188                 view_.set_scale_offset(view_.scale(),
 189                         mouse_down_offset_ +
 190                         (mouse_down_point_ - event->pos()).x() *
 191                         view_.scale());
 192         }
 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 *event)
 206 {
 207         assert(event);
 208
 209         if (event->orientation() == Qt::Vertical) {
 210                 // Vertical scrolling is interpreted as zooming in/out
 211                 view_.zoom(event->delta() / 120, event->x());
 212         } else if (event->orientation() == Qt::Horizontal) {
 213                 // Horizontal scrolling is interpreted as moving left/right
 214                 view_.set_scale_offset(view_.scale(),
 215                                        event->delta() * view_.scale()
 216                                        + view_.offset());
 217         }
 218 }
 219
 220 } // namespace view
 221 } // namespace pv