Archived:Using QLabel instead of QTextBrowser

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Qt Quick should be used for all UI development on mobile devices. The approach described in this article (using C++ for the Qt app UI) is deprecated.

Article Metadata

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Code Example

Source file: Media:QLabelSnippet.zip

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Tested with

Devices(s): 5800 XpressMusic

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Compatibility

Platform(s): Qt

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Article

Keywords: QLabel, usage

Created: taaidant (04 Jun 2009)

Last edited: hamishwillee (11 Oct 2012)

Overview

This code demonstrates how to display more than one line of text in QLabel without having to use QTextBrowser.

Header file

/*
 * Copyright (c) 2009 Nokia Corporation
 */
 
#ifndef QLABELSNIPPET_H
#define QLABELSNIPPET_H
 
#include <QtGui/QMainWindow>
#include <QtGui/QFrame>
#include <QtGui/QLabel>
#include <QtGui/QVBoxLayout>
 
#include <QtCore/QPointer>
#include <QtCore/QString>
 
class QLabelSnippet : public QMainWindow
{
	Q_OBJECT
 
public:
	QLabelSnippet(QWidget *parent = 0);
	~QLabelSnippet();
 
private:
	QPointer<QLabel> _textContainer;
};
 
#endif // QLABELSNIPPET_H

Source file

/*
 * Copyright (c) 2009 Nokia Corporation
 */
 
#include "qlabelsnippet.h"
 
QLabelSnippet::QLabelSnippet(QWidget *parent) : QMainWindow(parent) {
	/* Label we will be enabling the copy & paste in. */
	_textContainer = new QLabel;
	/* We'll make it not use only one line.  */
	_textContainer->setWordWrap(true);
	/* Contents can be scaled. */
	_textContainer->setScaledContents(true);
	/*
	 * Adjust to the size of the layout.
	 * http://doc.trolltech.com/qsizepolicy.html
	 */
	_textContainer->setSizePolicy(QSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum));
	/* We'll give it a border so you can see how it grows.*/
	_textContainer->setStyleSheet("border: 1px solid black;");
	/*
	 * Enable text selection and link accessing.
	 * http://doc.trolltech.com/qt.html#TextInteractionFlag-enum
	 */
	_textContainer->setTextInteractionFlags(Qt::TextBrowserInteraction);
	/* Let's align it to the top. */
	_textContainer->setAlignment(Qt::AlignTop);
	/* Let's put some lorem ipsum in it. */
	QString text = QString("Lorem ipsum dolor sit amet, consectetur");
	text.append("adipiscing elit. Ut a felis mauris. Fusce ");
	text.append("odio sapien, rutrum eu tincidunt eu, luctus ");
	text.append("vel libero. Praesent viverra tincidunt ipsum, ");
	text.append("nec dictum augue scelerisque in. Integer quis ");
	text.append("consectetur nisi. Phasellus ac bibendum arcu. ");
	text.append("Vivamus elementum cursus ligula, quis volutpat ");
	text.append("mi tincidunt quis. Fusce nec dui id tellus tristique ");
	text.append("luctus in sit amet erat. In volutpat diam nec libero ");
	text.append("scelerisque lobortis. Maecenas dolor quam, egestas at ");
	text.append("pretium nec, placerat eget leo. Sed ac ultricies enim. ");
	text.append("Nulla eget est tellus. In accumsan felis in tortor ");
	text.append("adipiscing eget pretium metus elementum. Ut id eros ");
	text.append("lorem. Nam interdum ipsum eu neque bibendum pretium. ");
	text.append("Etiam vitae congue massa.");
	_textContainer->setText(text);
	/* Displaying widgets is so much easier if we use a layout... */
	QVBoxLayout* layout = new QVBoxLayout;
	/* Let's add the widget to the layout */
	layout->addWidget(_textContainer);
	/* Now we need a central widget to act as our container */
	QFrame* frame = new QFrame(this);
	/* And set the layout as the container layout to get it displayed. */
	frame->setLayout(layout);
	/* Now we set the container as our central widget. */
	setCentralWidget(frame);
}
 
QLabelSnippet::~QLabelSnippet() {
	this->_textContainer->deleteLater();
}

Postconditions

You are able to use QLabel to contain long textual data, make it selectable, and get it to scale.

Supplementary material

• You can test QLabelSnippet with a test application. The application is available for download at Media:QLabelSnippet.zip.

See also

• QLabel documentation
• QTextBrowser documentation