Setup environment for SRD on Android
[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, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
19  */
20
21 #include <cassert>
22
23 #include "view.h"
24 #include "viewport.h"
25
26 #include "signal.h"
27 #include "../sigsession.h"
28
29 #include <QMouseEvent>
30
31 using std::max;
32 using std::min;
33 using std::shared_ptr;
34 using std::vector;
35
36 namespace pv {
37 namespace view {
38
39 Viewport::Viewport(View &parent) :
40         QWidget(&parent),
41         _view(parent),
42         _mouse_down_valid(false),
43         _pinch_zoom_active(false)
44 {
45         setAttribute(Qt::WA_AcceptTouchEvents, true);
46
47         setMouseTracking(true);
48         setAutoFillBackground(true);
49         setBackgroundRole(QPalette::Base);
50
51         connect(&_view.session(), SIGNAL(signals_changed()),
52                 this, SLOT(on_signals_changed()));
53
54         connect(&_view, SIGNAL(signals_moved()),
55                 this, SLOT(on_signals_moved()));
56
57         // Trigger the initial event manually. The default device has signals
58         // which were created before this object came into being
59         on_signals_changed();
60 }
61
62 int Viewport::get_total_height() const
63 {
64         int h = 0;
65         const vector< shared_ptr<Trace> > traces(_view.get_traces());
66         for (const shared_ptr<Trace> t : traces) {
67                 assert(t);
68                 h = max(t->get_v_offset() + View::SignalHeight, h);
69         }
70
71         return h;
72 }
73
74 void Viewport::paintEvent(QPaintEvent*)
75 {
76         const vector< shared_ptr<Trace> > traces(_view.get_traces());
77
78         QPainter p(this);
79         p.setRenderHint(QPainter::Antialiasing);
80
81         if (_view.cursors_shown())
82                 _view.cursors().draw_viewport_background(p, rect());
83
84         // Plot the signal
85         for (const shared_ptr<Trace> t : traces)
86         {
87                 assert(t);
88                 t->paint_back(p, 0, width());
89         }
90
91         for (const shared_ptr<Trace> t : traces)
92                 t->paint_mid(p, 0, width());
93
94         for (const shared_ptr<Trace> t : traces)
95                 t->paint_fore(p, 0, width());
96
97         if (_view.cursors_shown())
98                 _view.cursors().draw_viewport_foreground(p, rect());
99
100         p.end();
101 }
102
103 bool Viewport::event(QEvent *event)
104 {
105         switch(event->type()) {
106         case QEvent::TouchBegin:
107         case QEvent::TouchUpdate:
108         case QEvent::TouchEnd:
109                 if (touchEvent(static_cast<QTouchEvent *>(event)))
110                         return true;
111                 break;
112
113         default:
114                 break;
115         }
116
117         return QWidget::event(event);
118 }
119
120 void Viewport::mousePressEvent(QMouseEvent *event)
121 {
122         assert(event);
123
124         if (event->button() == Qt::LeftButton)
125         {
126                 _mouse_down_point = event->pos();
127                 _mouse_down_offset = _view.offset();
128                 _mouse_down_valid = true;
129         }
130 }
131
132 void Viewport::mouseReleaseEvent(QMouseEvent *event)
133 {
134         assert(event);
135
136         if (event->button() == Qt::LeftButton)
137         {
138                 _mouse_down_valid = false;
139         }
140 }
141
142 void Viewport::mouseMoveEvent(QMouseEvent *event)
143 {
144         assert(event);
145
146         if (event->buttons() & Qt::LeftButton)
147         {
148                 if (! _mouse_down_valid) {
149                         _mouse_down_point = event->pos();
150                         _mouse_down_offset = _view.offset();
151                         _mouse_down_valid = true;
152                 }
153
154                 _view.set_scale_offset(_view.scale(),
155                         _mouse_down_offset +
156                         (_mouse_down_point - event->pos()).x() *
157                         _view.scale());
158         }
159 }
160
161 void Viewport::mouseDoubleClickEvent(QMouseEvent *event)
162 {
163         assert(event);
164
165         if (event->buttons() & Qt::LeftButton)
166                 _view.zoom(2.0, event->x());
167         else if (event->buttons() & Qt::RightButton)
168                 _view.zoom(-2.0, event->x());
169 }
170
171 void Viewport::wheelEvent(QWheelEvent *event)
172 {
173         assert(event);
174
175         if (event->orientation() == Qt::Vertical) {
176                 // Vertical scrolling is interpreted as zooming in/out
177                 _view.zoom(event->delta() / 120, event->x());
178         } else if (event->orientation() == Qt::Horizontal) {
179                 // Horizontal scrolling is interpreted as moving left/right
180                 _view.set_scale_offset(_view.scale(),
181                                        event->delta() * _view.scale()
182                                        + _view.offset());
183         }
184 }
185
186 bool Viewport::touchEvent(QTouchEvent *event)
187 {
188         QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints();
189
190         if (touchPoints.count() != 2) {
191                 _pinch_zoom_active = false;
192                 return false;
193         }
194
195         const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
196         const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
197
198         if (!_pinch_zoom_active ||
199             (event->touchPointStates() & Qt::TouchPointPressed)) {
200                 _pinch_offset0 = _view.offset() + _view.scale() * touchPoint0.pos().x();
201                 _pinch_offset1 = _view.offset() + _view.scale() * touchPoint1.pos().x();
202                 _pinch_zoom_active = true;
203         }
204
205         double w = touchPoint1.pos().x() - touchPoint0.pos().x();
206         if (abs(w) >= 1.0) {
207                 double scale = (_pinch_offset1 - _pinch_offset0) / w;
208                 if (scale < 0)
209                         scale = -scale;
210                 double offset = _pinch_offset0 - touchPoint0.pos().x() * scale;
211                 if (scale > 0)
212                         _view.set_scale_offset(scale, offset);
213         }
214
215         if (event->touchPointStates() & Qt::TouchPointReleased) {
216                 _pinch_zoom_active = false;
217
218                 if (touchPoint0.state() & Qt::TouchPointReleased) {
219                         // Primary touch released
220                         _mouse_down_valid = false;
221                 } else {
222                         // Update the mouse down fields so that continued
223                         // dragging with the primary touch will work correctly
224                         _mouse_down_point = touchPoint0.pos().toPoint();
225                         _mouse_down_offset = _view.offset();
226                         _mouse_down_valid = true;
227                 }
228         }
229
230         return true;
231 }
232
233 void Viewport::on_signals_changed()
234 {
235         const vector< shared_ptr<Trace> > traces(_view.get_traces());
236         for (shared_ptr<Trace> t : traces) {
237                 assert(t);
238                 connect(t.get(), SIGNAL(visibility_changed()),
239                         this, SLOT(update()));
240         }
241 }
242
243 void Viewport::on_signals_moved()
244 {
245         update();
246 }
247
248 } // namespace view
249 } // namespace pv