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/*
* 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;
Q_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
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