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
  71 bool Popup::eventFilter(QObject *obj, QEvent *evt)
  72 {
  73         QKeyEvent *keyEvent;
  74
  75         (void)obj;
  76
  77         if (evt->type() == QEvent::KeyPress) {
  78                 keyEvent = static_cast<QKeyEvent*>(evt);
  79                 if (keyEvent->key() == Qt::Key_Enter ||
  80                     keyEvent->key() == Qt::Key_Return) {
  81                         close();
  82                         return true;
  83                 }
  84         }
  85
  86         return false;
  87 }
  88
  89 void Popup::show()
  90 {
  91         QLineEdit* le;
  92
  93         QWidget::show();
  94
  95         // We want to close the popup when the Enter key was
  96         // pressed and the first editable widget had focus.
  97         if ((le = this->findChild<QLineEdit*>())) {
  98
  99                 // For combo boxes we need to hook into the parent of
 100                 // the line edit (i.e. the QComboBox). For edit boxes
 101                 // we hook into the widget directly.
 102                 if (le->parent()->metaObject()->className() ==
 103                                 this->metaObject()->className())
 104                         le->installEventFilter(this);
 105                 else
 106                         le->parent()->installEventFilter(this);
 107
 108                 le->selectAll();
 109                 le->setFocus();
 110         }
 111 }
 112
 113 bool Popup::space_for_arrow() const
 114 {
 115         // Check if there is room for the arrow
 116         switch (pos_) {
 117         case Right:
 118                 if (point_.x() > x())
 119                         return false;
 120                 return true;
 121
 122         case Bottom:
 123                 if (point_.y() > y())
 124                         return false;
 125                 return true;
 126
 127         case Left:
 128                 if (point_.x() < (x() + width()))
 129                         return false;
 130                 return true;
 131
 132         case Top:
 133                 if (point_.y() < (y() + height()))
 134                         return false;
 135                 return true;
 136         }
 137
 138         return true;
 139 }
 140
 141 QPolygon Popup::arrow_polygon() const
 142 {
 143         QPolygon poly;
 144
 145         const QPoint p = mapFromGlobal(point_);
 146         const int l = ArrowLength + ArrowOverlap;
 147
 148         switch (pos_)
 149         {
 150         case Right:
 151                 poly << QPoint(p.x() + l, p.y() - l);
 152                 break;
 153
 154         case Bottom:
 155                 poly << QPoint(p.x() - l, p.y() + l);
 156                 break;
 157
 158         case Left:
 159         case Top:
 160                 poly << QPoint(p.x() - l, p.y() - l);
 161                 break;
 162         }
 163
 164         poly << p;
 165
 166         switch (pos_)
 167         {
 168         case Right:
 169         case Bottom:
 170                 poly << QPoint(p.x() + l, p.y() + l);
 171                 break;
 172
 173         case Left:
 174                 poly << QPoint(p.x() - l, p.y() + l);
 175                 break;
 176
 177         case Top:
 178                 poly << QPoint(p.x() + l, p.y() - l);
 179                 break;
 180         }
 181
 182         return poly;
 183 }
 184
 185 QRegion Popup::arrow_region() const
 186 {
 187         return QRegion(arrow_polygon());
 188 }
 189
 190 QRect Popup::bubble_rect() const
 191 {
 192         return QRect(
 193                 QPoint((pos_ == Right) ? ArrowLength : 0,
 194                         (pos_ == Bottom) ? ArrowLength : 0),
 195                 QSize(width() - ((pos_ == Left || pos_ == Right) ?
 196                                 ArrowLength : 0),
 197                         height() - ((pos_ == Top || pos_ == Bottom) ?
 198                                 ArrowLength : 0)));
 199 }
 200
 201 QRegion Popup::bubble_region() const
 202 {
 203         const QRect rect(bubble_rect());
 204
 205         const unsigned int r = MarginWidth;
 206         const unsigned int d = 2 * r;
 207         return QRegion(rect.adjusted(r, 0, -r, 0)).united(
 208                 QRegion(rect.adjusted(0, r, 0, -r))).united(
 209                 QRegion(rect.left(), rect.top(), d, d,
 210                         QRegion::Ellipse)).united(
 211                 QRegion(rect.right() - d, rect.top(), d, d,
 212                         QRegion::Ellipse)).united(
 213                 QRegion(rect.left(), rect.bottom() - d, d, d,
 214                         QRegion::Ellipse)).united(
 215                 QRegion(rect.right() - d, rect.bottom() - d, d, d,
 216                         QRegion::Ellipse));
 217 }
 218
 219 QRegion Popup::popup_region() const
 220 {
 221         if (space_for_arrow())
 222                 return arrow_region().united(bubble_region());
 223         else
 224                 return bubble_region();
 225 }
 226
 227 void Popup::reposition_widget()
 228 {
 229         QPoint o;
 230
 231         const QRect screen_rect = QApplication::desktop()->availableGeometry(
 232                 QApplication::desktop()->screenNumber(point_));
 233
 234         if (pos_ == Right || pos_ == Left)
 235                 o.ry() = -height() / 2;
 236         else
 237                 o.rx() = -width() / 2;
 238
 239         if (pos_ == Left)
 240                 o.rx() = -width();
 241         else if(pos_ == Top)
 242                 o.ry() = -height();
 243
 244         o += point_;
 245         move(max(min(o.x(), screen_rect.right() - width()),
 246                         screen_rect.left()),
 247                 max(min(o.y(), screen_rect.bottom() - height()),
 248                         screen_rect.top()));
 249 }
 250
 251 void Popup::closeEvent(QCloseEvent*)
 252 {
 253         closed();
 254 }
 255
 256 void Popup::paintEvent(QPaintEvent*)
 257 {
 258         QPainter painter(this);
 259         painter.setRenderHint(QPainter::Antialiasing);
 260
 261         const QColor outline_color(QApplication::palette().color(
 262                 QPalette::Dark));
 263
 264         // Draw the bubble
 265         const QRegion b = bubble_region();
 266         const QRegion bubble_outline = QRegion(rect()).subtracted(
 267                 b.translated(1, 0).intersected(b.translated(0, 1).intersected(
 268                 b.translated(-1, 0).intersected(b.translated(0, -1)))));
 269
 270         painter.setPen(Qt::NoPen);
 271         painter.setBrush(QApplication::palette().brush(QPalette::Window));
 272         painter.drawRect(rect());
 273
 274         // Draw the arrow
 275         if (!space_for_arrow())
 276                 return;
 277
 278         const QPoint ArrowOffsets[] = {
 279                 QPoint(1, 0), QPoint(0, -1), QPoint(-1, 0), QPoint(0, 1)};
 280
 281         const QRegion a(arrow_region());
 282         const QRegion arrow_outline = a.subtracted(
 283                 a.translated(ArrowOffsets[pos_]));
 284
 285         painter.setClipRegion(bubble_outline.subtracted(a).united(
 286                 arrow_outline));
 287         painter.setBrush(outline_color);
 288         painter.drawRect(rect());
 289 }
 290
 291 void Popup::resizeEvent(QResizeEvent*)
 292 {
 293         reposition_widget();
 294         setMask(popup_region());
 295 }
 296
 297 void Popup::mouseReleaseEvent(QMouseEvent *e)
 298 {
 299         assert(e);
 300
 301         // We need our own out-of-bounds click handler because QWidget counts
 302         // the drop-shadow region as inside the widget
 303         if(!bubble_rect().contains(e->pos()))
 304                 close();
 305 }
 306
 307 void Popup::showEvent(QShowEvent*)
 308 {
 309         reposition_widget();
 310 }
 311
 312 } // namespace widgets
 313 } // namespace pv
 314