Warning, file /sdk/cervisia/tooltip.cpp was not indexed or was modified since last indexation (in which case cross-reference links may be missing, inaccurate or erroneous).

 /*
  * Copyright (c) 2004-2008 André Wöbbeking <Woebbeking@kde.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  */
 
 #include "tooltip.h"
 
 #include <QApplication>
 #include <QDesktopWidget>
 #include <qevent.h>
 #include <qtextdocument.h>
 #include <qtooltip.h>
 
 namespace Cervisia
 {
 
 static QString truncateLines(const QString &, const QFontMetrics &, const QSize &);
 static QString truncateLines(const QString &, const QFont &, const QPoint &, const QRect &);
 
 ToolTip::ToolTip(QWidget *widget)
     : QObject(widget)
 {
     widget->installEventFilter(this);
 }
 
 bool ToolTip::eventFilter(QObject *watched, QEvent *event)
 {
     if ((watched == parent()) && (event->type() == QEvent::ToolTip)) {
         const QHelpEvent *helpEvent = static_cast<QHelpEvent *>(event);
 
         QRect rect;
         QString text;
         emit queryToolTip(helpEvent->pos(), rect, text);
 
         if (rect.isValid() && !text.isEmpty()) {
             auto parentWidget = static_cast<QWidget *>(parent());
             text = truncateLines(text, QToolTip::font(), helpEvent->globalPos(), qApp->desktop()->availableGeometry(parentWidget));
             QToolTip::showText(helpEvent->globalPos(), text, parentWidget, rect);
         }
 
         return true;
     }
 
     return QObject::eventFilter(watched, event);
 }
 
 // Primitive routine to truncate the text. size.width() is ignored, only
 // size.height() is used at the moment to keep it fast. It doesn't work
 // correct if text lines have different heights.
 QString truncateLines(const QString &text, const QFontMetrics &fm, const QSize &size)
 {
     const QChar newLine('\n');
 
     const int lineSpacing(fm.lineSpacing());
     const int numberOfLines(text.count(newLine) + 1);
     const int maxNumberOfLines(size.height() / lineSpacing);
 
     if (numberOfLines <= maxNumberOfLines)
         return text;
 
     const QChar *unicode(text.unicode());
     for (int count(maxNumberOfLines); count; ++unicode)
         if (*unicode == newLine)
             --count;
 
     return text.left(unicode - text.unicode() - 1);
 }
 
 // Truncate the tooltip's text if necessary
 QString truncateLines(const QString &text, const QFont &font, const QPoint &globalPos, const QRect &desktopGeometry)
 {
     // maximum size of the tooltip, - 10 just to be safe
     const int maxWidth(qMax(desktopGeometry.width() - globalPos.x(), globalPos.x()) - desktopGeometry.left() - 10);
     const int maxHeight(qMax(desktopGeometry.height() - globalPos.y(), globalPos.y()) - desktopGeometry.top() - 10);
 
     // calculate the tooltip's size
     QTextDocument layoutedText;
     layoutedText.setHtml(text);
     layoutedText.setDefaultFont(font);
 
     // only if the tooltip's size is bigger in x- and y-direction the text must
     // be truncated otherwise the tip is moved to a position where it fits
     return ((layoutedText.size().width() > maxWidth) && (layoutedText.size().height() > maxHeight))
         ? truncateLines(text, QFontMetrics(font), QSize(maxWidth, maxHeight))
         : text;
 }
 
 } // namespace Cervisia