QLabel Class

 QLabel *label = new QLabel(this);
 label->setFrameStyle(QFrame::Panel | QFrame::Sunken);
 label->setText("first line\nsecond line");
 label->setAlignment(Qt::AlignBottom | Qt::AlignRight);

 QLineEdit *phoneEdit = new QLineEdit(this);
 QLabel *phoneLabel = new QLabel("&Phone:", this);
 phoneLabel->setBuddy(phoneEdit);

Property Documentation

alignment : Qt::Alignment

This property holds the alignment of the label's contents

By default, the contents of the label are left-aligned and vertically-centered.

Access functions:

See also text.

hasSelectedText : const bool

This property holds whether there is any text selected

hasSelectedText() returns true if some or all of the text has been selected by the user; otherwise returns false.

By default, this property is false.

Note: The textInteractionFlags set on the label need to include either TextSelectableByMouse or TextSelectableByKeyboard.

This property was introduced in Qt 4.7.

Access functions:

See also selectedText().

indent : int

This property holds the label's text indent in pixels

If a label displays text, the indent applies to the left edge if alignment() is Qt::AlignLeft, to the right edge if alignment() is Qt::AlignRight, to the top edge if alignment() is Qt::AlignTop, and to the bottom edge if alignment() is Qt::AlignBottom.

If indent is negative, or if no indent has been set, the label computes the effective indent as follows: If frameWidth() is 0, the effective indent becomes 0. If frameWidth() is greater than 0, the effective indent becomes half the width of the "x" character of the widget's current font().

By default, the indent is -1, meaning that an effective indent is calculating in the manner described above.

Access functions:

See also alignment, margin, frameWidth(), and font().

margin : int

This property holds the width of the margin

The margin is the distance between the innermost pixel of the frame and the outermost pixel of contents.

The default margin is 0.

Access functions:

See also indent.

openExternalLinks : bool

Specifies whether QLabel should automatically open links using QDesktopServices::openUrl() instead of emitting the linkActivated() signal.

Note: The textInteractionFlags set on the label need to include either LinksAccessibleByMouse or LinksAccessibleByKeyboard.

The default value is false.

This property was introduced in Qt 4.2.

Access functions:

See also textInteractionFlags().

pixmap : QPixmap

This property holds the label's pixmap.

Previously, Qt provided a version of pixmap() which returned the pixmap by-pointer. That version is now deprecated. To maintain compatibility with old code, you can explicitly differentiate between the by-pointer function and the by-value function:

 const QPixmap *pixmapPtr = label->pixmap();
 QPixmap pixmapVal = label->pixmap(Qt::ReturnByValue);

If you disable the deprecated version using the QT_DISABLE_DEPRECATED_BEFORE macro, then you can omit Qt::ReturnByValue as shown below:

 QPixmap pixmapVal = label->pixmap();

If no pixmap has been set, the deprecated getter function will return nullptr.

Setting the pixmap clears any previous content. The buddy shortcut, if any, is disabled.

Access functions:

scaledContents : bool

This property holds whether the label will scale its contents to fill all available space.

When enabled and the label shows a pixmap, it will scale the pixmap to fill the available space.

This property's default is false.

Access functions:

selectedText : const QString

This property holds the selected text

If there is no selected text this property's value is an empty string.

By default, this property contains an empty string.

Note: The textInteractionFlags set on the label need to include either TextSelectableByMouse or TextSelectableByKeyboard.

This property was introduced in Qt 4.7.

Access functions:

See also hasSelectedText().

text : QString

This property holds the label's text

If no text has been set this will return an empty string. Setting the text clears any previous content.

The text will be interpreted either as plain text or as rich text, depending on the text format setting; see setTextFormat(). The default setting is Qt::AutoText; i.e. QLabel will try to auto-detect the format of the text set. See Supported HTML Subset for the definition of rich text.

If a buddy has been set, the buddy mnemonic key is updated from the new text.

Note that QLabel is well-suited to display small rich text documents, such as small documents that get their document specific settings (font, text color, link color) from the label's palette and font properties. For large documents, use QTextEdit in read-only mode instead. QTextEdit can also provide a scroll bar when necessary.

Access functions:

See also setTextFormat(), setBuddy(), and alignment.

textFormat : Qt::TextFormat

This property holds the label's text format

See the Qt::TextFormat enum for an explanation of the possible options.

The default format is Qt::AutoText.

Access functions:

See also text().

textInteractionFlags : Qt::TextInteractionFlags

Specifies how the label should interact with user input if it displays text.

If the flags contain Qt::LinksAccessibleByKeyboard the focus policy is also automatically set to Qt::StrongFocus. If Qt::TextSelectableByKeyboard is set then the focus policy is set to Qt::ClickFocus.

The default value is Qt::LinksAccessibleByMouse.

This property was introduced in Qt 4.2.

Access functions:

wordWrap : bool

This property holds the label's word-wrapping policy

If this property is true then label text is wrapped where necessary at word-breaks; otherwise it is not wrapped at all.

By default, word wrap is disabled.

Access functions:

See also text.