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/*
* Copyright (c) 2004-2007 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 <kglobal.h>
#include <kglobalsettings.h>
#include <qsimplerichtext.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), QToolTip(widget)
{
}
void ToolTip::maybeTip(const QPoint& pos)
{
QRect rect;
QString text;
emit queryToolTip(pos, rect, text);
if (rect.isValid() && !text.isEmpty())
{
text = truncateLines(text,
font(),
parentWidget()->mapToGlobal(pos),
KGlobalSettings::desktopGeometry(parentWidget()));
tip(rect, text);
}
}
// Primtive 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.contains(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(kMax(desktopGeometry.width() - globalPos.x(), globalPos.x())
- desktopGeometry.left() - 10);
const int maxHeight(kMax(desktopGeometry.height() - globalPos.y(), globalPos.y())
- desktopGeometry.top() - 10);
// calculate the tooltip's size
const QSimpleRichText layoutedText(text, 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.widthUsed() > maxWidth)
&& (layoutedText.height() > maxHeight))
? truncateLines(text, QFontMetrics(font), QSize(maxWidth, maxHeight))
: text;
}
} // namespace Cervisia
#include "tooltip.moc"
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