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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 "rowitempaintparams.hpp" | |
26 | #include "signal.hpp" | |
27 | #include "view.hpp" | |
28 | #include "viewport.hpp" | |
29 | ||
30 | #include <pv/session.hpp> | |
31 | ||
32 | #include <QMouseEvent> | |
33 | ||
34 | using std::abs; | |
35 | using std::max; | |
36 | using std::min; | |
37 | using std::shared_ptr; | |
38 | using std::stable_sort; | |
39 | using std::vector; | |
40 | ||
41 | namespace pv { | |
42 | namespace view { | |
43 | ||
44 | Viewport::Viewport(View &parent) : | |
45 | QWidget(&parent), | |
46 | view_(parent), | |
47 | mouse_down_valid_(false), | |
48 | pinch_zoom_active_(false) | |
49 | { | |
50 | setAttribute(Qt::WA_AcceptTouchEvents, true); | |
51 | ||
52 | setMouseTracking(true); | |
53 | setAutoFillBackground(true); | |
54 | setBackgroundRole(QPalette::Base); | |
55 | ||
56 | connect(&view_, SIGNAL(signals_moved()), | |
57 | this, SLOT(on_signals_moved())); | |
58 | } | |
59 | ||
60 | void Viewport::paintEvent(QPaintEvent*) | |
61 | { | |
62 | vector< shared_ptr<RowItem> > row_items(view_.begin(), view_.end()); | |
63 | stable_sort(row_items.begin(), row_items.end(), | |
64 | [](const shared_ptr<RowItem> &a, const shared_ptr<RowItem> &b) { | |
65 | return a->visual_v_offset() < b->visual_v_offset(); }); | |
66 | ||
67 | QPainter p(this); | |
68 | p.setRenderHint(QPainter::Antialiasing); | |
69 | ||
70 | if (view_.cursors_shown()) | |
71 | view_.cursors()->draw_viewport_background(p, rect()); | |
72 | ||
73 | const RowItemPaintParams pp(0, width(), view_.scale(), view_.offset()); | |
74 | ||
75 | // Plot the signal | |
76 | for (const shared_ptr<RowItem> r : row_items) | |
77 | { | |
78 | assert(r); | |
79 | r->paint_back(p, pp); | |
80 | } | |
81 | ||
82 | for (const shared_ptr<RowItem> r : row_items) | |
83 | r->paint_mid(p, pp); | |
84 | ||
85 | for (const shared_ptr<RowItem> r : row_items) | |
86 | r->paint_fore(p, pp); | |
87 | ||
88 | if (view_.cursors_shown()) | |
89 | view_.cursors()->draw_viewport_foreground(p, rect()); | |
90 | ||
91 | p.end(); | |
92 | } | |
93 | ||
94 | bool Viewport::event(QEvent *event) | |
95 | { | |
96 | switch (event->type()) { | |
97 | case QEvent::TouchBegin: | |
98 | case QEvent::TouchUpdate: | |
99 | case QEvent::TouchEnd: | |
100 | if (touchEvent(static_cast<QTouchEvent *>(event))) | |
101 | return true; | |
102 | break; | |
103 | ||
104 | default: | |
105 | break; | |
106 | } | |
107 | ||
108 | return QWidget::event(event); | |
109 | } | |
110 | ||
111 | void Viewport::mousePressEvent(QMouseEvent *event) | |
112 | { | |
113 | assert(event); | |
114 | ||
115 | if (event->button() == Qt::LeftButton) { | |
116 | mouse_down_point_ = event->pos(); | |
117 | mouse_down_offset_ = view_.offset(); | |
118 | mouse_down_valid_ = true; | |
119 | } | |
120 | } | |
121 | ||
122 | void Viewport::mouseReleaseEvent(QMouseEvent *event) | |
123 | { | |
124 | assert(event); | |
125 | ||
126 | if (event->button() == Qt::LeftButton) | |
127 | mouse_down_valid_ = false; | |
128 | } | |
129 | ||
130 | void Viewport::mouseMoveEvent(QMouseEvent *event) | |
131 | { | |
132 | assert(event); | |
133 | ||
134 | if (event->buttons() & Qt::LeftButton) { | |
135 | if (!mouse_down_valid_) { | |
136 | mouse_down_point_ = event->pos(); | |
137 | mouse_down_offset_ = view_.offset(); | |
138 | mouse_down_valid_ = true; | |
139 | } | |
140 | ||
141 | view_.set_scale_offset(view_.scale(), | |
142 | mouse_down_offset_ + | |
143 | (mouse_down_point_ - event->pos()).x() * | |
144 | view_.scale()); | |
145 | } | |
146 | } | |
147 | ||
148 | void Viewport::mouseDoubleClickEvent(QMouseEvent *event) | |
149 | { | |
150 | assert(event); | |
151 | ||
152 | if (event->buttons() & Qt::LeftButton) | |
153 | view_.zoom(2.0, event->x()); | |
154 | else if (event->buttons() & Qt::RightButton) | |
155 | view_.zoom(-2.0, event->x()); | |
156 | } | |
157 | ||
158 | void Viewport::wheelEvent(QWheelEvent *event) | |
159 | { | |
160 | assert(event); | |
161 | ||
162 | if (event->orientation() == Qt::Vertical) { | |
163 | // Vertical scrolling is interpreted as zooming in/out | |
164 | view_.zoom(event->delta() / 120, event->x()); | |
165 | } else if (event->orientation() == Qt::Horizontal) { | |
166 | // Horizontal scrolling is interpreted as moving left/right | |
167 | view_.set_scale_offset(view_.scale(), | |
168 | event->delta() * view_.scale() | |
169 | + view_.offset()); | |
170 | } | |
171 | } | |
172 | ||
173 | bool Viewport::touchEvent(QTouchEvent *event) | |
174 | { | |
175 | QList<QTouchEvent::TouchPoint> touchPoints = event->touchPoints(); | |
176 | ||
177 | if (touchPoints.count() != 2) { | |
178 | pinch_zoom_active_ = false; | |
179 | return false; | |
180 | } | |
181 | ||
182 | const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first(); | |
183 | const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last(); | |
184 | ||
185 | if (!pinch_zoom_active_ || | |
186 | (event->touchPointStates() & Qt::TouchPointPressed)) { | |
187 | pinch_offset0_ = view_.offset() + view_.scale() * touchPoint0.pos().x(); | |
188 | pinch_offset1_ = view_.offset() + view_.scale() * touchPoint1.pos().x(); | |
189 | pinch_zoom_active_ = true; | |
190 | } | |
191 | ||
192 | double w = touchPoint1.pos().x() - touchPoint0.pos().x(); | |
193 | if (abs(w) >= 1.0) { | |
194 | double scale = (pinch_offset1_ - pinch_offset0_) / w; | |
195 | if (scale < 0) | |
196 | scale = -scale; | |
197 | double offset = pinch_offset0_ - touchPoint0.pos().x() * scale; | |
198 | if (scale > 0) | |
199 | view_.set_scale_offset(scale, offset); | |
200 | } | |
201 | ||
202 | if (event->touchPointStates() & Qt::TouchPointReleased) { | |
203 | pinch_zoom_active_ = false; | |
204 | ||
205 | if (touchPoint0.state() & Qt::TouchPointReleased) { | |
206 | // Primary touch released | |
207 | mouse_down_valid_ = false; | |
208 | } else { | |
209 | // Update the mouse down fields so that continued | |
210 | // dragging with the primary touch will work correctly | |
211 | mouse_down_point_ = touchPoint0.pos().toPoint(); | |
212 | mouse_down_offset_ = view_.offset(); | |
213 | mouse_down_valid_ = true; | |
214 | } | |
215 | } | |
216 | ||
217 | return true; | |
218 | } | |
219 | ||
220 | void Viewport::on_signals_moved() | |
221 | { | |
222 | update(); | |
223 | } | |
224 | ||
225 | } // namespace view | |
226 | } // namespace pv |