pv/widgets/popup.cpp

   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