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