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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 | _mouse_down_point = event->pos(); | |
126 | _mouse_down_offset = _view.offset(); | |
127 | _mouse_down_valid = true; | |
128 | } | |
129 | } | |
130 | ||
131 | void Viewport::mouseReleaseEvent(QMouseEvent *event) | |
132 | { | |
133 | assert(event); | |
134 | ||
135 | if (event->button() == Qt::LeftButton) | |
136 | _mouse_down_valid = false; | |
137 | } | |
138 | ||
139 | void Viewport::mouseMoveEvent(QMouseEvent *event) | |
140 | { | |
141 | assert(event); | |
142 | ||
143 | if (event->buttons() & Qt::LeftButton) { | |
144 | if (!_mouse_down_valid) { | |
145 | _mouse_down_point = event->pos(); | |
146 | _mouse_down_offset = _view.offset(); | |
147 | _mouse_down_valid = true; | |
148 | } | |
149 | ||
150 | _view.set_scale_offset(_view.scale(), | |
151 | _mouse_down_offset + | |
152 | (_mouse_down_point - event->pos()).x() * | |
153 | _view.scale()); | |
154 | } | |
155 | } | |
156 | ||
157 | void Viewport::mouseDoubleClickEvent(QMouseEvent *event) | |
158 | { | |
159 | assert(event); | |
160 | ||
161 | if (event->buttons() & Qt::LeftButton) | |
162 | _view.zoom(2.0, event->x()); | |
163 | else if (event->buttons() & Qt::RightButton) | |
164 | _view.zoom(-2.0, event->x()); | |
165 | } | |
166 | ||
167 | void Viewport::wheelEvent(QWheelEvent *event) | |
168 | { | |
169 | assert(event); | |
170 | ||
171 | if (event->orientation() == Qt::Vertical) { | |
172 | // Vertical scrolling is interpreted as zooming in/out | |
173 | _view.zoom(event->delta() / 120, event->x()); | |
174 | } else if (event->orientation() == Qt::Horizontal) { | |
175 | // Horizontal scrolling is interpreted as moving left/right | |
176 | _view.set_scale_offset(_view.scale(), | |
177 | event->delta() * _view.scale() | |
178 | + _view.offset()); | |
179 | } | |
180 | } | |
181 | ||
182 | bool Viewport::touchEvent(QTouchEvent *event) | |
183 | { | |
184 | QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints(); | |
185 | ||
186 | if (touchPoints.count() != 2) { | |
187 | _pinch_zoom_active = false; | |
188 | return false; | |
189 | } | |
190 | ||
191 | const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first(); | |
192 | const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last(); | |
193 | ||
194 | if (!_pinch_zoom_active || | |
195 | (event->touchPointStates() & Qt::TouchPointPressed)) { | |
196 | _pinch_offset0 = _view.offset() + _view.scale() * touchPoint0.pos().x(); | |
197 | _pinch_offset1 = _view.offset() + _view.scale() * touchPoint1.pos().x(); | |
198 | _pinch_zoom_active = true; | |
199 | } | |
200 | ||
201 | double w = touchPoint1.pos().x() - touchPoint0.pos().x(); | |
202 | if (abs(w) >= 1.0) { | |
203 | double scale = (_pinch_offset1 - _pinch_offset0) / w; | |
204 | if (scale < 0) | |
205 | scale = -scale; | |
206 | double offset = _pinch_offset0 - touchPoint0.pos().x() * scale; | |
207 | if (scale > 0) | |
208 | _view.set_scale_offset(scale, offset); | |
209 | } | |
210 | ||
211 | if (event->touchPointStates() & Qt::TouchPointReleased) { | |
212 | _pinch_zoom_active = false; | |
213 | ||
214 | if (touchPoint0.state() & Qt::TouchPointReleased) { | |
215 | // Primary touch released | |
216 | _mouse_down_valid = false; | |
217 | } else { | |
218 | // Update the mouse down fields so that continued | |
219 | // dragging with the primary touch will work correctly | |
220 | _mouse_down_point = touchPoint0.pos().toPoint(); | |
221 | _mouse_down_offset = _view.offset(); | |
222 | _mouse_down_valid = true; | |
223 | } | |
224 | } | |
225 | ||
226 | return true; | |
227 | } | |
228 | ||
229 | void Viewport::on_signals_changed() | |
230 | { | |
231 | const vector< shared_ptr<Trace> > traces(_view.get_traces()); | |
232 | for (shared_ptr<Trace> t : traces) { | |
233 | assert(t); | |
234 | connect(t.get(), SIGNAL(visibility_changed()), | |
235 | this, SLOT(update())); | |
236 | } | |
237 | } | |
238 | ||
239 | void Viewport::on_signals_moved() | |
240 | { | |
241 | update(); | |
242 | } | |
243 | ||
244 | } // namespace view | |
245 | } // namespace pv |