- Qt 5.15
- Qt SVG
- C++ Classes
- QSvgWidget
- Qt 5.15.19 Reference Documentation

# QSvgWidget Class

The QSvgWidget class provides a widget that is used to display the contents of Scalable Vector Graphics (SVG) files. More...

Header: | #include <QSvgWidget>
qmake: | QT += svg
Since: | Qt 4.1
Inherits: | QWidget

This class was introduced in Qt 4.1.

- List of all members, including inherited members

## Public Functions

| QSvgWidget(const QString &file, QWidget *parent = nullptr)
| QSvgWidget(QWidget *parent = nullptr)
virtual | ~QSvgWidget()
QSvgRenderer * | renderer() const

## Reimplemented Public Functions

virtual QSize | sizeHint() const override

## Public Slots

void | load(const QByteArray &contents)
void | load(const QString &file)

## Reimplemented Protected Functions

virtual void | paintEvent(QPaintEvent *event) override

## Detailed Description

This class enables developers to display SVG drawings alongside standard widgets, and is used in much the same way as QLabel is used for displaying text and bitmap images.

Since QSvgWidget is a subclass of QWidget, SVG drawings are rendered using the properties of the display. More control can be exercised over the rendering process with the QSvgRenderer class, as this can be used to paint onto other paint devices, such as QImage and QGLWidget. The renderer used by the widget can be obtained with the renderer() function.

Each QSvgWidget can be constructed with the file name of a SVG file, or they can be constructed without a specific file to render and one can be supplied later. The load() functions provide two different ways to load an SVG file: they accept either the file name of an SVG file or a QByteArray containing the serialized XML representation of an SVG file.

By default, the widget provides a size hint to reflect the size of the drawing that it displays. If no data has been loaded, the widget provides the default QWidget size hint. Subclass this class and reimplement sizeHint() if you need to customize this behavior.

See also QSvgRenderer, Qt SVG C++ Classes, and QPicture.

## Member Function Documentation

### QSvgWidget::QSvgWidget(const QString &file, QWidget *parent = nullptr)

Constructs a new SVG display widget with the given parent and loads the contents of the specified file.

### QSvgWidget::QSvgWidget(QWidget *parent = nullptr)

Constructs a new SVG display widget with the given parent.

### `[slot]` void QSvgWidget::load(const QByteArray &contents)

Loads the specified SVG format contents and updates the widget.

### `[slot]` void QSvgWidget::load(const QString &file)

Loads the contents of the specified SVG file and updates the widget.

### `[virtual]` QSvgWidget::~QSvgWidget()

Destroys the widget.

### `[override virtual protected]` void QSvgWidget::paintEvent(QPaintEvent *event)

Reimplements: QWidget::paintEvent(QPaintEvent *event).

### QSvgRenderer *QSvgWidget::renderer() const

Returns the renderer used to display the contents of the widget.

### `[override virtual]` QSize QSvgWidget::sizeHint() const

Reimplements an access function for property: QWidget::sizeHint.