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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "elidedlabel.h"
#include <QPainter>
#include <QTextLayout>
#include <QDebug>
//! [0]
ElidedLabel::ElidedLabel(const QString &text, QWidget *parent)
: QFrame(parent)
, elided(false)
, content(text)
{
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
}
//! [0]
//! [1]
void ElidedLabel::setText(const QString &newText)
{
content = newText;
update();
}
//! [1]
//! [2]
void ElidedLabel::paintEvent(QPaintEvent *event)
{
QFrame::paintEvent(event);
QPainter painter(this);
QFontMetrics fontMetrics = painter.fontMetrics();
bool didElide = false;
int lineSpacing = fontMetrics.lineSpacing();
int y = 0;
QTextLayout textLayout(content, painter.font());
textLayout.beginLayout();
forever {
QTextLine line = textLayout.createLine();
if (!line.isValid())
break;
line.setLineWidth(width());
int nextLineY = y + lineSpacing;
if (height() >= nextLineY + lineSpacing) {
line.draw(&painter, QPoint(0, y));
y = nextLineY;
//! [2]
//! [3]
} else {
QString lastLine = content.mid(line.textStart());
QString elidedLastLine = fontMetrics.elidedText(lastLine, Qt::ElideRight, width());
painter.drawText(QPoint(0, y + fontMetrics.ascent()), elidedLastLine);
line = textLayout.createLine();
didElide = line.isValid();
break;
}
}
textLayout.endLayout();
//! [3]
//! [4]
if (didElide != elided) {
elided = didElide;
emit elisionChanged(didElide);
}
}
//! [4]
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