TraceView: Fix variable name
[pulseview.git] / 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, see <http://www.gnu.org/licenses/>.
18  */
19
20 #include <cassert>
21 #include <cmath>
22 #include <algorithm>
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::max;
41 using std::min;
42 using std::none_of;
43 using std::numeric_limits;
44 using std::shared_ptr;
45 using std::stable_sort;
46 using std::vector;
47
48 namespace pv {
49 namespace views {
50 namespace TraceView {
51
52 Viewport::Viewport(View &parent) :
53         ViewWidget(parent),
54         pinch_zoom_active_(false)
55 {
56         setAutoFillBackground(true);
57         setBackgroundRole(QPalette::Base);
58 }
59
60 shared_ptr<ViewItem> Viewport::get_mouse_over_item(const QPoint &pt)
61 {
62         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
63         const vector< shared_ptr<ViewItem> > items(this->items());
64         for (auto i = items.rbegin(); i != items.rend(); i++)
65                 if ((*i)->enabled() &&
66                         (*i)->hit_box_rect(pp).contains(pt))
67                         return *i;
68         return nullptr;
69 }
70
71 void Viewport::item_hover(const shared_ptr<ViewItem> &item)
72 {
73         if (item && item->is_draggable())
74                 setCursor(dynamic_pointer_cast<RowItem>(item) ?
75                         Qt::SizeVerCursor : Qt::SizeHorCursor);
76         else
77                 unsetCursor();
78 }
79
80 void Viewport::drag()
81 {
82         drag_offset_ = view_.offset();
83         drag_v_offset_ = view_.owner_visual_v_offset();
84 }
85
86 void Viewport::drag_by(const QPoint &delta)
87 {
88         if (drag_offset_ == boost::none)
89                 return;
90
91         view_.set_scale_offset(view_.scale(),
92                 (*drag_offset_ - delta.x() * view_.scale()));
93
94         view_.set_v_offset(-drag_v_offset_ - delta.y());
95 }
96
97 void Viewport::drag_release()
98 {
99         drag_offset_ = boost::none;
100 }
101
102 vector< shared_ptr<ViewItem> > Viewport::items()
103 {
104         vector< shared_ptr<ViewItem> > items;
105         const std::vector< shared_ptr<ViewItem> > view_items(
106                 view_.list_by_type<ViewItem>());
107         copy(view_items.begin(), view_items.end(), back_inserter(items));
108         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
109         copy(time_items.begin(), time_items.end(), back_inserter(items));
110         return items;
111 }
112
113 bool Viewport::touch_event(QTouchEvent *event)
114 {
115         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
116
117         if (touchPoints.count() != 2) {
118                 pinch_zoom_active_ = false;
119                 return false;
120         }
121
122         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
123         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
124
125         if (!pinch_zoom_active_ ||
126             (event->touchPointStates() & Qt::TouchPointPressed)) {
127                 pinch_offset0_ = (view_.offset() + view_.scale() * touchPoint0.pos().x()).convert_to<double>();
128                 pinch_offset1_ = (view_.offset() + view_.scale() * touchPoint1.pos().x()).convert_to<double>();
129                 pinch_zoom_active_ = true;
130         }
131
132         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
133         if (abs(w) >= 1.0) {
134                 const double scale =
135                         fabs((pinch_offset1_ - pinch_offset0_) / w);
136                 double offset = pinch_offset0_ - touchPoint0.pos().x() * scale;
137                 if (scale > 0)
138                         view_.set_scale_offset(scale, offset);
139         }
140
141         if (event->touchPointStates() & Qt::TouchPointReleased) {
142                 pinch_zoom_active_ = false;
143
144                 if (touchPoint0.state() & Qt::TouchPointReleased) {
145                         // Primary touch released
146                         drag_release();
147                 } else {
148                         // Update the mouse down fields so that continued
149                         // dragging with the primary touch will work correctly
150                         mouse_down_point_ = touchPoint0.pos().toPoint();
151                         drag();
152                 }
153         }
154
155         return true;
156 }
157
158 void Viewport::paintEvent(QPaintEvent*)
159 {
160         vector< shared_ptr<RowItem> > row_items(view_.list_by_type<RowItem>());
161         assert(none_of(row_items.begin(), row_items.end(),
162                 [](const shared_ptr<RowItem> &r) { return !r; }));
163
164         stable_sort(row_items.begin(), row_items.end(),
165                 [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) {
166                         return a->point(QRect()).y() < b->point(QRect()).y(); });
167
168         const vector< shared_ptr<TimeItem> > time_items(view_.time_items());
169         assert(none_of(time_items.begin(), time_items.end(),
170                 [](const shared_ptr<TimeItem> &t) { return !t; }));
171
172         QPainter p(this);
173         p.setRenderHint(QPainter::Antialiasing);
174
175         const ViewItemPaintParams pp(rect(), view_.scale(), view_.offset());
176
177         for (const shared_ptr<TimeItem> t : time_items)
178                 t->paint_back(p, pp);
179         for (const shared_ptr<RowItem> r : row_items)
180                 r->paint_back(p, pp);
181
182         for (const shared_ptr<TimeItem> t : time_items)
183                 t->paint_mid(p, pp);
184         for (const shared_ptr<RowItem> r : row_items)
185                 r->paint_mid(p, pp);
186
187         for (const shared_ptr<RowItem> r : row_items)
188                 r->paint_fore(p, pp);
189
190         p.setRenderHint(QPainter::Antialiasing, false);
191         for (const shared_ptr<TimeItem> t : time_items)
192                 t->paint_fore(p, pp);
193
194         p.end();
195 }
196
197 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
198 {
199         assert(event);
200
201         if (event->buttons() & Qt::LeftButton)
202                 view_.zoom(2.0, event->x());
203         else if (event->buttons() & Qt::RightButton)
204                 view_.zoom(-2.0, event->x());
205 }
206
207 void Viewport::wheelEvent(QWheelEvent *event)
208 {
209         assert(event);
210
211         if (event->orientation() == Qt::Vertical) {
212                 if (event->modifiers() & Qt::ControlModifier) {
213                         // Vertical scrolling with the control key pressed
214                         // is intrepretted as vertical scrolling
215                         view_.set_v_offset(-view_.owner_visual_v_offset() -
216                                 (event->delta() * height()) / (8 * 120));
217                 } else {
218                         // Vertical scrolling is interpreted as zooming in/out
219                         view_.zoom(event->delta() / 120, event->x());
220                 }
221         } else if (event->orientation() == Qt::Horizontal) {
222                 // Horizontal scrolling is interpreted as moving left/right
223                 view_.set_scale_offset(view_.scale(),
224                         event->delta() * view_.scale() + view_.offset());
225         }
226 }
227
228 } // namespace TraceView
229 } // namespace views
230 } // namespace pv