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