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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, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <algorithm> | |
22 | ||
23 | #include <assert.h> | |
24 | ||
25 | #include <QtGui> | |
26 | #include <QApplication> | |
27 | #include <QDesktopWidget> | |
28 | #include <QLineEdit> | |
29 | ||
30 | #include "popup.hpp" | |
31 | ||
32 | using std::max; | |
33 | using std::min; | |
34 | ||
35 | namespace pv { | |
36 | namespace widgets { | |
37 | ||
38 | const unsigned int Popup::ArrowLength = 10; | |
39 | const unsigned int Popup::ArrowOverlap = 3; | |
40 | const unsigned int Popup::MarginWidth = 6; | |
41 | ||
42 | Popup::Popup(QWidget *parent) : | |
43 | QWidget(parent, Qt::Popup | Qt::FramelessWindowHint), | |
44 | point_(), | |
45 | pos_(Left) | |
46 | { | |
47 | } | |
48 | ||
49 | const QPoint& Popup::point() const | |
50 | { | |
51 | return point_; | |
52 | } | |
53 | ||
54 | Popup::Position Popup::position() const | |
55 | { | |
56 | return pos_; | |
57 | } | |
58 | ||
59 | void Popup::set_position(const QPoint point, Position pos) | |
60 | { | |
61 | point_ = point, pos_ = pos; | |
62 | ||
63 | setContentsMargins( | |
64 | MarginWidth + ((pos == Right) ? ArrowLength : 0), | |
65 | MarginWidth + ((pos == Bottom) ? ArrowLength : 0), | |
66 | MarginWidth + ((pos == Left) ? ArrowLength : 0), | |
67 | MarginWidth + ((pos == Top) ? ArrowLength : 0)); | |
68 | } | |
69 | ||
70 | bool Popup::eventFilter(QObject *obj, QEvent *event) | |
71 | { | |
72 | QKeyEvent *keyEvent; | |
73 | ||
74 | (void)obj; | |
75 | ||
76 | if (event->type() == QEvent::KeyPress) { | |
77 | keyEvent = static_cast<QKeyEvent*>(event); | |
78 | if (keyEvent->key() == Qt::Key_Enter || | |
79 | keyEvent->key() == Qt::Key_Return) { | |
80 | close(); | |
81 | return true; | |
82 | } | |
83 | } | |
84 | ||
85 | return false; | |
86 | } | |
87 | ||
88 | void Popup::show() | |
89 | { | |
90 | QLineEdit* le; | |
91 | ||
92 | QWidget::show(); | |
93 | ||
94 | // We want to close the popup when the Enter key was | |
95 | // pressed and the first editable widget had focus. | |
96 | if ((le = this->findChild<QLineEdit*>())) { | |
97 | ||
98 | // For combo boxes we need to hook into the parent of | |
99 | // the line edit (i.e. the QComboBox). For edit boxes | |
100 | // we hook into the widget directly. | |
101 | if (le->parent()->metaObject()->className() == | |
102 | this->metaObject()->className()) | |
103 | le->installEventFilter(this); | |
104 | else | |
105 | le->parent()->installEventFilter(this); | |
106 | ||
107 | le->selectAll(); | |
108 | le->setFocus(); | |
109 | } | |
110 | } | |
111 | ||
112 | bool Popup::space_for_arrow() const | |
113 | { | |
114 | // Check if there is room for the arrow | |
115 | switch (pos_) { | |
116 | case Right: | |
117 | if (point_.x() > x()) | |
118 | return false; | |
119 | return true; | |
120 | ||
121 | case Bottom: | |
122 | if (point_.y() > y()) | |
123 | return false; | |
124 | return true; | |
125 | ||
126 | case Left: | |
127 | if (point_.x() < (x() + width())) | |
128 | return false; | |
129 | return true; | |
130 | ||
131 | case Top: | |
132 | if (point_.y() < (y() + height())) | |
133 | return false; | |
134 | return true; | |
135 | } | |
136 | ||
137 | return true; | |
138 | } | |
139 | ||
140 | QPolygon Popup::arrow_polygon() const | |
141 | { | |
142 | QPolygon poly; | |
143 | ||
144 | const QPoint p = mapFromGlobal(point_); | |
145 | const int l = ArrowLength + ArrowOverlap; | |
146 | ||
147 | switch (pos_) { | |
148 | case Right: | |
149 | poly << QPoint(p.x() + l, p.y() - l); | |
150 | break; | |
151 | ||
152 | case Bottom: | |
153 | poly << QPoint(p.x() - l, p.y() + l); | |
154 | break; | |
155 | ||
156 | case Left: | |
157 | case Top: | |
158 | poly << QPoint(p.x() - l, p.y() - l); | |
159 | break; | |
160 | } | |
161 | ||
162 | poly << p; | |
163 | ||
164 | switch (pos_) { | |
165 | case Right: | |
166 | case Bottom: | |
167 | poly << QPoint(p.x() + l, p.y() + l); | |
168 | break; | |
169 | ||
170 | case Left: | |
171 | poly << QPoint(p.x() - l, p.y() + l); | |
172 | break; | |
173 | ||
174 | case Top: | |
175 | poly << QPoint(p.x() + l, p.y() - l); | |
176 | break; | |
177 | } | |
178 | ||
179 | return poly; | |
180 | } | |
181 | ||
182 | QRegion Popup::arrow_region() const | |
183 | { | |
184 | return QRegion(arrow_polygon()); | |
185 | } | |
186 | ||
187 | QRect Popup::bubble_rect() const | |
188 | { | |
189 | return QRect( | |
190 | QPoint((pos_ == Right) ? ArrowLength : 0, | |
191 | (pos_ == Bottom) ? ArrowLength : 0), | |
192 | QSize(width() - ((pos_ == Left || pos_ == Right) ? | |
193 | ArrowLength : 0), | |
194 | height() - ((pos_ == Top || pos_ == Bottom) ? | |
195 | ArrowLength : 0))); | |
196 | } | |
197 | ||
198 | QRegion Popup::bubble_region() const | |
199 | { | |
200 | const QRect rect(bubble_rect()); | |
201 | ||
202 | const unsigned int r = MarginWidth; | |
203 | const unsigned int d = 2 * r; | |
204 | return QRegion(rect.adjusted(r, 0, -r, 0)).united( | |
205 | QRegion(rect.adjusted(0, r, 0, -r))).united( | |
206 | QRegion(rect.left(), rect.top(), d, d, | |
207 | QRegion::Ellipse)).united( | |
208 | QRegion(rect.right() - d, rect.top(), d, d, | |
209 | QRegion::Ellipse)).united( | |
210 | QRegion(rect.left(), rect.bottom() - d, d, d, | |
211 | QRegion::Ellipse)).united( | |
212 | QRegion(rect.right() - d, rect.bottom() - d, d, d, | |
213 | QRegion::Ellipse)); | |
214 | } | |
215 | ||
216 | QRegion Popup::popup_region() const | |
217 | { | |
218 | if (space_for_arrow()) | |
219 | return arrow_region().united(bubble_region()); | |
220 | else | |
221 | return bubble_region(); | |
222 | } | |
223 | ||
224 | void Popup::reposition_widget() | |
225 | { | |
226 | QPoint o; | |
227 | ||
228 | const QRect screen_rect = QApplication::desktop()->availableGeometry( | |
229 | QApplication::desktop()->screenNumber(point_)); | |
230 | ||
231 | if (pos_ == Right || pos_ == Left) | |
232 | o.ry() = -height() / 2; | |
233 | else | |
234 | o.rx() = -width() / 2; | |
235 | ||
236 | if (pos_ == Left) | |
237 | o.rx() = -width(); | |
238 | else if (pos_ == Top) | |
239 | o.ry() = -height(); | |
240 | ||
241 | o += point_; | |
242 | move(max(min(o.x(), screen_rect.right() - width()), | |
243 | screen_rect.left()), | |
244 | max(min(o.y(), screen_rect.bottom() - height()), | |
245 | screen_rect.top())); | |
246 | } | |
247 | ||
248 | void Popup::closeEvent(QCloseEvent*) | |
249 | { | |
250 | closed(); | |
251 | } | |
252 | ||
253 | void Popup::paintEvent(QPaintEvent*) | |
254 | { | |
255 | QPainter painter(this); | |
256 | painter.setRenderHint(QPainter::Antialiasing); | |
257 | ||
258 | const QColor outline_color(QApplication::palette().color( | |
259 | QPalette::Dark)); | |
260 | ||
261 | // Draw the bubble | |
262 | const QRegion b = bubble_region(); | |
263 | const QRegion bubble_outline = QRegion(rect()).subtracted( | |
264 | b.translated(1, 0).intersected(b.translated(0, 1).intersected( | |
265 | b.translated(-1, 0).intersected(b.translated(0, -1))))); | |
266 | ||
267 | painter.setPen(Qt::NoPen); | |
268 | painter.setBrush(QApplication::palette().brush(QPalette::Window)); | |
269 | painter.drawRect(rect()); | |
270 | ||
271 | // Draw the arrow | |
272 | if (!space_for_arrow()) | |
273 | return; | |
274 | ||
275 | const QPoint ArrowOffsets[] = { | |
276 | QPoint(1, 0), QPoint(0, -1), QPoint(-1, 0), QPoint(0, 1)}; | |
277 | ||
278 | const QRegion a(arrow_region()); | |
279 | const QRegion arrow_outline = a.subtracted( | |
280 | a.translated(ArrowOffsets[pos_])); | |
281 | ||
282 | painter.setClipRegion(bubble_outline.subtracted(a).united( | |
283 | arrow_outline)); | |
284 | painter.setBrush(outline_color); | |
285 | painter.drawRect(rect()); | |
286 | } | |
287 | ||
288 | void Popup::resizeEvent(QResizeEvent*) | |
289 | { | |
290 | reposition_widget(); | |
291 | setMask(popup_region()); | |
292 | } | |
293 | ||
294 | void Popup::mouseReleaseEvent(QMouseEvent *event) | |
295 | { | |
296 | assert(event); | |
297 | ||
298 | // We need our own out-of-bounds click handler because QWidget counts | |
299 | // the drop-shadow region as inside the widget | |
300 | if (!bubble_rect().contains(event->pos())) | |
301 | close(); | |
302 | } | |
303 | ||
304 | void Popup::showEvent(QShowEvent*) | |
305 | { | |
306 | reposition_widget(); | |
307 | } | |
308 | ||
309 | } // namespace widgets | |
310 | } // namespace pv |