ResInsight/Fwk/AppFwk/cafProjectDataModel/cafPdmUiCore/cafQShortenedLabel.cpp

//##################################################################################################
//
//   Custom Visualization Core library
//   Copyright (C) 2019- Ceetron Solutions AS
//
//   This library may be used under the terms of either the GNU General Public License or
//   the GNU Lesser General Public License as follows:
//
//   GNU General Public License Usage
//   This library 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 3 of the License, or
//   (at your option) any later version.
//
//   This library 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 at <<http://www.gnu.org/licenses/gpl.html>>
//   for more details.
//
//   GNU Lesser General Public License Usage
//   This library is free software; you can redistribute it and/or modify
//   it under the terms of the GNU Lesser General Public License as published by
//   the Free Software Foundation; either version 2.1 of the License, or
//   (at your option) any later version.
//
//   This library 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 Lesser General Public License at <<http://www.gnu.org/licenses/lgpl-2.1.html>>
//   for more details.
//
//##################################################################################################
#include "cafQShortenedLabel.h"

#include <QApplication>
#include <QFontMetrics>
#include <QResizeEvent>
#include <QVBoxLayout>

using namespace caf;

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QShortenedLabel::QShortenedLabel(QWidget* parent /*= nullptr*/, Qt::WindowFlags f /*= Qt::WindowFlags()*/)
    : QLabel(parent, f)
{
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void QShortenedLabel::setText(const QString& text)
{
    bool textHasChanged = m_fullLengthText != text;

    m_fullLengthText = text;
    setDisplayText(text);

    if (textHasChanged)
    {
        adjustSize();
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QString QShortenedLabel::fullText() const
{
     return m_fullLengthText;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QSize QShortenedLabel::minimumSizeHint() const
{
    int minimumWidth = 20;

    QFontMetrics fontMetrics = QApplication::fontMetrics();
    QString fullLabelText = fullText();

    if (!fullLabelText.isEmpty())
    {
        int maxLineWidth      = 0;
        int maxFirstWordWidth = 0;

        QStringList labelLines = fullLabelText.split("\n");
        for (QString line : labelLines)
        {
            int lineWidth  = fontMetrics.width(line);
            maxLineWidth = std::max(maxLineWidth, lineWidth);
            QStringList words = line.split(" ");
            if (!words.empty())
            {
                int wordWidth = fontMetrics.width(words.front() + "...");
                maxFirstWordWidth  = std::max(maxFirstWordWidth, wordWidth);
            }
        }
        int minimumTextWidth = std::min(maxLineWidth, maxFirstWordWidth);
        minimumWidth = std::max(minimumWidth, minimumTextWidth);
    }
    QSize minimumSize = QLabel::minimumSizeHint();
    minimumSize.setWidth(minimumWidth);
    return minimumSize;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QSize QShortenedLabel::sizeHint() const
{
    QFontMetrics fontMetrics = QApplication::fontMetrics();
    QString      labelText   = fullText();
    
    QStringList labelLines   = labelText.split("\n");
    int         maxLineWidth = 0;
    for (const QString& line : labelLines)
    {
        maxLineWidth = std::max(maxLineWidth, fontMetrics.width(line));
    }
        
    return QSize(maxLineWidth, QLabel::sizeHint().height());
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void QShortenedLabel::resizeEvent(QResizeEvent* event)
{
    QSize paintSize = event->size();
    resizeText(paintSize);
    QLabel::resizeEvent(event);
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void caf::QShortenedLabel::resizeText(QSize paintSize)
{
    QString      labelText   = fullText();
    QFontMetrics fontMetrics = QApplication::fontMetrics();

    QStringList labelLines   = labelText.split("\n");
    int         maxLineWidth = 0;
    for (const QString& line : labelLines)
    {
        maxLineWidth += fontMetrics.width(line);
    }

    if (maxLineWidth < paintSize.width())
    {
        setDisplayText(labelText);
    }
    else
    {
        int limitWidth = std::max(minimumSizeHint().width(), paintSize.width());

        QStringList elidedLines;
        for (const QString& line : labelLines)
        {
            QString elidedLine = fontMetrics.elidedText(line, Qt::ElideRight, limitWidth);
            elidedLines.push_back(elidedLine);
        }
        setDisplayText(elidedLines.join("\n"));
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void QShortenedLabel::setDisplayText(const QString& displayText)
{
    QLabel::setText(displayText);
}