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1 | /* | |
2 | * This file is part of the PulseView project. | |
3 | * | |
4 | * Copyright (C) 2013 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, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <algorithm> | |
21 | #include <cassert> | |
22 | ||
23 | #include <QtGui> | |
24 | #include <QApplication> | |
25 | #include <QDesktopWidget> | |
26 | #include <QLineEdit> | |
27 | ||
28 | #include "popup.hpp" | |
29 | ||
30 | using std::max; | |
31 | using std::min; | |
32 | ||
33 | namespace pv { | |
34 | namespace widgets { | |
35 | ||
36 | const unsigned int Popup::ArrowLength = 10; | |
37 | const unsigned int Popup::ArrowOverlap = 3; | |
38 | const unsigned int Popup::MarginWidth = 6; | |
39 | ||
40 | Popup::Popup(QWidget *parent) : | |
41 | QWidget(parent, Qt::Popup | Qt::FramelessWindowHint), | |
42 | point_(), | |
43 | pos_(Left) | |
44 | { | |
45 | } | |
46 | ||
47 | const QPoint& Popup::point() const | |
48 | { | |
49 | return point_; | |
50 | } | |
51 | ||
52 | Popup::Position Popup::position() const | |
53 | { | |
54 | return pos_; | |
55 | } | |
56 | ||
57 | void Popup::set_position(const QPoint point, Position pos) | |
58 | { | |
59 | point_ = point, pos_ = pos; | |
60 | ||
61 | setContentsMargins( | |
62 | MarginWidth + ((pos == Right) ? ArrowLength : 0), | |
63 | MarginWidth + ((pos == Bottom) ? ArrowLength : 0), | |
64 | MarginWidth + ((pos == Left) ? ArrowLength : 0), | |
65 | MarginWidth + ((pos == Top) ? ArrowLength : 0)); | |
66 | } | |
67 | ||
68 | bool Popup::eventFilter(QObject *obj, QEvent *event) | |
69 | { | |
70 | QKeyEvent *keyEvent; | |
71 | ||
72 | (void)obj; | |
73 | ||
74 | if (event->type() == QEvent::KeyPress) { | |
75 | keyEvent = static_cast<QKeyEvent*>(event); | |
76 | if (keyEvent->key() == Qt::Key_Enter || | |
77 | keyEvent->key() == Qt::Key_Return) { | |
78 | close(); | |
79 | return true; | |
80 | } | |
81 | } | |
82 | ||
83 | return false; | |
84 | } | |
85 | ||
86 | void Popup::show() | |
87 | { | |
88 | QLineEdit* le; | |
89 | ||
90 | QWidget::show(); | |
91 | ||
92 | // We want to close the popup when the Enter key was | |
93 | // pressed and the first editable widget had focus. | |
94 | if ((le = this->findChild<QLineEdit*>())) { | |
95 | ||
96 | // For combo boxes we need to hook into the parent of | |
97 | // the line edit (i.e. the QComboBox). For edit boxes | |
98 | // we hook into the widget directly. | |
99 | if (le->parent()->metaObject()->className() == | |
100 | this->metaObject()->className()) | |
101 | le->installEventFilter(this); | |
102 | else | |
103 | le->parent()->installEventFilter(this); | |
104 | ||
105 | le->selectAll(); | |
106 | le->setFocus(); | |
107 | } | |
108 | } | |
109 | ||
110 | bool Popup::space_for_arrow() const | |
111 | { | |
112 | // Check if there is room for the arrow | |
113 | switch (pos_) { | |
114 | case Right: | |
115 | if (point_.x() > x()) | |
116 | return false; | |
117 | return true; | |
118 | ||
119 | case Bottom: | |
120 | if (point_.y() > y()) | |
121 | return false; | |
122 | return true; | |
123 | ||
124 | case Left: | |
125 | if (point_.x() < (x() + width())) | |
126 | return false; | |
127 | return true; | |
128 | ||
129 | case Top: | |
130 | if (point_.y() < (y() + height())) | |
131 | return false; | |
132 | return true; | |
133 | } | |
134 | ||
135 | return true; | |
136 | } | |
137 | ||
138 | QPolygon Popup::arrow_polygon() const | |
139 | { | |
140 | QPolygon poly; | |
141 | ||
142 | const QPoint p = mapFromGlobal(point_); | |
143 | const int l = ArrowLength + ArrowOverlap; | |
144 | ||
145 | switch (pos_) { | |
146 | case Right: | |
147 | poly << QPoint(p.x() + l, p.y() - l); | |
148 | break; | |
149 | ||
150 | case Bottom: | |
151 | poly << QPoint(p.x() - l, p.y() + l); | |
152 | break; | |
153 | ||
154 | case Left: | |
155 | case Top: | |
156 | poly << QPoint(p.x() - l, p.y() - l); | |
157 | break; | |
158 | } | |
159 | ||
160 | poly << p; | |
161 | ||
162 | switch (pos_) { | |
163 | case Right: | |
164 | case Bottom: | |
165 | poly << QPoint(p.x() + l, p.y() + l); | |
166 | break; | |
167 | ||
168 | case Left: | |
169 | poly << QPoint(p.x() - l, p.y() + l); | |
170 | break; | |
171 | ||
172 | case Top: | |
173 | poly << QPoint(p.x() + l, p.y() - l); | |
174 | break; | |
175 | } | |
176 | ||
177 | return poly; | |
178 | } | |
179 | ||
180 | QRegion Popup::arrow_region() const | |
181 | { | |
182 | return QRegion(arrow_polygon()); | |
183 | } | |
184 | ||
185 | QRect Popup::bubble_rect() const | |
186 | { | |
187 | return QRect( | |
188 | QPoint((pos_ == Right) ? ArrowLength : 0, | |
189 | (pos_ == Bottom) ? ArrowLength : 0), | |
190 | QSize(width() - ((pos_ == Left || pos_ == Right) ? | |
191 | ArrowLength : 0), | |
192 | height() - ((pos_ == Top || pos_ == Bottom) ? | |
193 | ArrowLength : 0))); | |
194 | } | |
195 | ||
196 | QRegion Popup::bubble_region() const | |
197 | { | |
198 | const QRect rect(bubble_rect()); | |
199 | ||
200 | const unsigned int r = MarginWidth; | |
201 | const unsigned int d = 2 * r; | |
202 | return QRegion(rect.adjusted(r, 0, -r, 0)).united( | |
203 | QRegion(rect.adjusted(0, r, 0, -r))).united( | |
204 | QRegion(rect.left(), rect.top(), d, d, | |
205 | QRegion::Ellipse)).united( | |
206 | QRegion(rect.right() - d, rect.top(), d, d, | |
207 | QRegion::Ellipse)).united( | |
208 | QRegion(rect.left(), rect.bottom() - d, d, d, | |
209 | QRegion::Ellipse)).united( | |
210 | QRegion(rect.right() - d, rect.bottom() - d, d, d, | |
211 | QRegion::Ellipse)); | |
212 | } | |
213 | ||
214 | QRegion Popup::popup_region() const | |
215 | { | |
216 | if (space_for_arrow()) | |
217 | return arrow_region().united(bubble_region()); | |
218 | else | |
219 | return bubble_region(); | |
220 | } | |
221 | ||
222 | void Popup::reposition_widget() | |
223 | { | |
224 | QPoint o; | |
225 | ||
226 | const QRect screen_rect = QApplication::desktop()->availableGeometry( | |
227 | QApplication::desktop()->screenNumber(point_)); | |
228 | ||
229 | if (pos_ == Right || pos_ == Left) | |
230 | o.ry() = -height() / 2; | |
231 | else | |
232 | o.rx() = -width() / 2; | |
233 | ||
234 | if (pos_ == Left) | |
235 | o.rx() = -width(); | |
236 | else if (pos_ == Top) | |
237 | o.ry() = -height(); | |
238 | ||
239 | o += point_; | |
240 | move(max(min(o.x(), screen_rect.right() - width()), | |
241 | screen_rect.left()), | |
242 | max(min(o.y(), screen_rect.bottom() - height()), | |
243 | screen_rect.top())); | |
244 | } | |
245 | ||
246 | void Popup::closeEvent(QCloseEvent*) | |
247 | { | |
248 | closed(); | |
249 | } | |
250 | ||
251 | void Popup::paintEvent(QPaintEvent*) | |
252 | { | |
253 | QPainter painter(this); | |
254 | painter.setRenderHint(QPainter::Antialiasing); | |
255 | ||
256 | const QColor outline_color(QApplication::palette().color( | |
257 | QPalette::Dark)); | |
258 | ||
259 | // Draw the bubble | |
260 | const QRegion b = bubble_region(); | |
261 | const QRegion bubble_outline = QRegion(rect()).subtracted( | |
262 | b.translated(1, 0).intersected(b.translated(0, 1).intersected( | |
263 | b.translated(-1, 0).intersected(b.translated(0, -1))))); | |
264 | ||
265 | painter.setPen(Qt::NoPen); | |
266 | painter.setBrush(QApplication::palette().brush(QPalette::Window)); | |
267 | painter.drawRect(rect()); | |
268 | ||
269 | // Draw the arrow | |
270 | if (!space_for_arrow()) | |
271 | return; | |
272 | ||
273 | const QPoint ArrowOffsets[] = { | |
274 | QPoint(1, 0), QPoint(0, -1), QPoint(-1, 0), QPoint(0, 1)}; | |
275 | ||
276 | const QRegion a(arrow_region()); | |
277 | const QRegion arrow_outline = a.subtracted( | |
278 | a.translated(ArrowOffsets[pos_])); | |
279 | ||
280 | painter.setClipRegion(bubble_outline.subtracted(a).united( | |
281 | arrow_outline)); | |
282 | painter.setBrush(outline_color); | |
283 | painter.drawRect(rect()); | |
284 | } | |
285 | ||
286 | void Popup::resizeEvent(QResizeEvent*) | |
287 | { | |
288 | reposition_widget(); | |
289 | setMask(popup_region()); | |
290 | } | |
291 | ||
292 | void Popup::mouseReleaseEvent(QMouseEvent *event) | |
293 | { | |
294 | assert(event); | |
295 | ||
296 | // We need our own out-of-bounds click handler because QWidget counts | |
297 | // the drop-shadow region as inside the widget | |
298 | if (!bubble_rect().contains(event->pos())) | |
299 | close(); | |
300 | } | |
301 | ||
302 | void Popup::showEvent(QShowEvent*) | |
303 | { | |
304 | reposition_widget(); | |
305 | } | |
306 | ||
307 | } // namespace widgets | |
308 | } // namespace pv |