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         setAttribute(Qt::WA_AcceptTouchEvents, true);
  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 vector< shared_ptr<ViewItem> > Viewport::items()
  69 {
  70         vector< shared_ptr<ViewItem> > items(view_.begin(), view_.end());
  71         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
  72         copy(time_items.begin(), time_items.end(), back_inserter(items));
  73         return items;
  74 }
  75
  76 void Viewport::paintEvent(QPaintEvent*)
  77 {
  78         vector< shared_ptr<RowItem> > row_items(view_.begin(), view_.end());
  79         assert(none_of(row_items.begin(), row_items.end(),
  80                 [](const shared_ptr<RowItem> &r) { return !r; }));
  81
  82         stable_sort(row_items.begin(), row_items.end(),
  83                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
  84                         return a->visual_v_offset() < b->visual_v_offset(); });
  85
  86         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
  87         assert(none_of(time_items.begin(), time_items.end(),
  88                 [](const shared_ptr<TimeItem> &t) { return !t; }));
  89
  90         QPainter p(this);
  91         p.setRenderHint(QPainter::Antialiasing);
  92
  93         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
  94
  95         for (const shared_ptr<TimeItem> t : time_items)
  96                 t->paint_back(p, pp);
  97         for (const shared_ptr<RowItem> r : row_items)
  98                 r->paint_back(p, pp);
  99
 100         for (const shared_ptr<TimeItem> t : time_items)
 101                 t->paint_mid(p, pp);
 102         for (const shared_ptr<RowItem> r : row_items)
 103                 r->paint_mid(p, pp);
 104
 105         for (const shared_ptr<RowItem> r : row_items)
 106                 r->paint_fore(p, pp);
 107         for (const shared_ptr<TimeItem> t : time_items)
 108                 t->paint_fore(p, pp);
 109
 110         p.end();
 111 }
 112
 113 bool Viewport::event(QEvent *event)
 114 {
 115         switch (event->type()) {
 116         case QEvent::TouchBegin:
 117         case QEvent::TouchUpdate:
 118         case QEvent::TouchEnd:
 119                 if (touchEvent(static_cast<QTouchEvent *>(event)))
 120                         return true;
 121                 break;
 122
 123         default:
 124                 break;
 125         }
 126
 127         return QWidget::event(event);
 128 }
 129
 130 void Viewport::mousePressEvent(QMouseEvent *event)
 131 {
 132         assert(event);
 133
 134         if (event->button() == Qt::LeftButton) {
 135                 mouse_down_point_ = event->pos();
 136                 mouse_down_offset_ = view_.offset();
 137                 mouse_down_valid_ = true;
 138         }
 139 }
 140
 141 void Viewport::mouseReleaseEvent(QMouseEvent *event)
 142 {
 143         assert(event);
 144
 145         if (event->button() == Qt::LeftButton)
 146                 mouse_down_valid_ = false;
 147 }
 148
 149 void Viewport::mouseMoveEvent(QMouseEvent *event)
 150 {
 151         assert(event);
 152
 153         if (event->buttons() & Qt::LeftButton) {
 154                 if (!mouse_down_valid_) {
 155                         mouse_down_point_ = event->pos();
 156                         mouse_down_offset_ = view_.offset();
 157                         mouse_down_valid_ = true;
 158                 }
 159
 160                 view_.set_scale_offset(view_.scale(),
 161                         mouse_down_offset_ +
 162                         (mouse_down_point_ - event->pos()).x() *
 163                         view_.scale());
 164         }
 165 }
 166
 167 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
 168 {
 169         assert(event);
 170
 171         if (event->buttons() & Qt::LeftButton)
 172                 view_.zoom(2.0, event->x());
 173         else if (event->buttons() & Qt::RightButton)
 174                 view_.zoom(-2.0, event->x());
 175 }
 176
 177 void Viewport::wheelEvent(QWheelEvent *event)
 178 {
 179         assert(event);
 180
 181         if (event->orientation() == Qt::Vertical) {
 182                 // Vertical scrolling is interpreted as zooming in/out
 183                 view_.zoom(event->delta() / 120, event->x());
 184         } else if (event->orientation() == Qt::Horizontal) {
 185                 // Horizontal scrolling is interpreted as moving left/right
 186                 view_.set_scale_offset(view_.scale(),
 187                                        event->delta() * view_.scale()
 188                                        + view_.offset());
 189         }
 190 }
 191
 192 bool Viewport::touchEvent(QTouchEvent *event)
 193 {
 194         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
 195
 196         if (touchPoints.count() != 2) {
 197                 pinch_zoom_active_ = false;
 198                 return false;
 199         }
 200
 201         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
 202         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
 203
 204         if (!pinch_zoom_active_ ||
 205             (event->touchPointStates() & Qt::TouchPointPressed)) {
 206                 pinch_offset0_ = view_.offset() + view_.scale() * touchPoint0.pos().x();
 207                 pinch_offset1_ = view_.offset() + view_.scale() * touchPoint1.pos().x();
 208                 pinch_zoom_active_ = true;
 209         }
 210
 211         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
 212         if (abs(w) >= 1.0) {
 213                 double scale = (pinch_offset1_ - pinch_offset0_) / w;
 214                 if (scale < 0)
 215                         scale = -scale;
 216                 double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
 217                 if (scale > 0)
 218                         view_.set_scale_offset(scale, offset);
 219         }
 220
 221         if (event->touchPointStates() & Qt::TouchPointReleased) {
 222                 pinch_zoom_active_ = false;
 223
 224                 if (touchPoint0.state() & Qt::TouchPointReleased) {
 225                         // Primary touch released
 226                         mouse_down_valid_ = false;
 227                 } else {
 228                         // Update the mouse down fields so that continued
 229                         // dragging with the primary touch will work correctly
 230                         mouse_down_point_ = touchPoint0.pos().toPoint();
 231                         mouse_down_offset_ = view_.offset();
 232                         mouse_down_valid_ = true;
 233                 }
 234         }
 235
 236         return true;
 237 }
 238
 239 } // namespace view
 240 } // namespace pv