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// ttlineedit.cpp
// Copyright (C) 2012-2021 by Werner Lemberg.
//
// This file is part of the ttfautohint library, and may only be used,
// modified, and distributed under the terms given in `COPYING'. By
// continuing to use, modify, or distribute this file you indicate that you
// have read `COPYING' and understand and accept it fully.
//
// The file `COPYING' mentioned in the previous paragraph is distributed
// with the ttfautohint library.
// Derived class `Tooltip_Line_Edit' is QLineEdit that displays a tooltip
// if the data in the field is wider than the field width.
#include <config.h>
#include "ttlineedit.h"
Tooltip_Line_Edit::Tooltip_Line_Edit(QWidget* parent)
: QLineEdit(parent)
{
connect(this, SIGNAL(textChanged(QString)),
this, SLOT(change_tooltip(QString)));
}
void Tooltip_Line_Edit::change_tooltip(QString tip)
{
QFont font = this->font();
QFontMetrics metrics(font);
// get the (sum of the) left and right borders; this is a bit tricky
// since Qt doesn't have methods to directly access those margin values
int line_minwidth = minimumSizeHint().width();
int char_maxwidth = metrics.maxWidth();
int border = line_minwidth - char_maxwidth;
int linewidth = this->width();
int textwidth = metrics.width(tip);
if (textwidth > linewidth - border)
this->setToolTip(tip);
else
this->setToolTip("");
}
// end of ttlineedit.cpp
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