Qt
Internal/Contributor docs for the Qt SDK. <b>Note:</b> These are NOT official API docs; those are found <a href='https://doc.qt.io/'>here</a>.
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#include <qsvgrenderer.h>
Public Slots | |
bool | load (const QString &filename) |
Loads the SVG file specified by filename, returning true if the content was successfully parsed; otherwise returns false. | |
bool | load (const QByteArray &contents) |
Loads the specified SVG format contents, returning true if the content was successfully parsed; otherwise returns false. | |
bool | load (QXmlStreamReader *contents) |
Loads the specified SVG in contents, returning true if the content was successfully parsed; otherwise returns false. | |
void | render (QPainter *p) |
Renders the current document, or the current frame of an animated document, using the given painter. | |
void | render (QPainter *p, const QRectF &bounds) |
Renders the current document, or the current frame of an animated document, using the given painter on the specified bounds within the painter. | |
void | render (QPainter *p, const QString &elementId, const QRectF &bounds=QRectF()) |
Renders the given element with elementId using the given painter on the specified bounds. | |
Public Slots inherited from QObject | |
void | deleteLater () |
\threadsafe | |
Signals | |
void | repaintNeeded () |
This signal is emitted whenever the rendering of the document needs to be updated, usually for the purposes of animation. | |
Signals inherited from QObject | |
void | destroyed (QObject *=nullptr) |
This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked. | |
void | objectNameChanged (const QString &objectName, QPrivateSignal) |
This signal is emitted after the object's name has been changed. | |
Public Member Functions | |
QSvgRenderer (QObject *parent=nullptr) | |
Constructs a new renderer with the given parent. | |
QSvgRenderer (const QString &filename, QObject *parent=nullptr) | |
Constructs a new renderer with the given parent and loads the contents of the SVG file with the specified filename. | |
QSvgRenderer (const QByteArray &contents, QObject *parent=nullptr) | |
Constructs a new renderer with the given parent and loads the SVG data from the byte array specified by contents. | |
QSvgRenderer (QXmlStreamReader *contents, QObject *parent=nullptr) | |
~QSvgRenderer () | |
Destroys the renderer. | |
bool | isValid () const |
Returns true if there is a valid current document; otherwise returns false. | |
QSize | defaultSize () const |
Returns the default size of the document contents. | |
QRect | viewBox () const |
Returns viewBoxF().toRect(). | |
QRectF | viewBoxF () const |
void | setViewBox (const QRect &viewbox) |
void | setViewBox (const QRectF &viewbox) |
Qt::AspectRatioMode | aspectRatioMode () const |
void | setAspectRatioMode (Qt::AspectRatioMode mode) |
QtSvg::Options | options () const |
void | setOptions (QtSvg::Options flags) |
bool | animated () const |
Returns true if the current document contains animated elements; otherwise returns false. | |
int | framesPerSecond () const |
void | setFramesPerSecond (int num) |
int | currentFrame () const |
void | setCurrentFrame (int) |
int | animationDuration () const |
bool | isAnimationEnabled () const |
void | setAnimationEnabled (bool enable) |
QRectF | boundsOnElement (const QString &id) const |
bool | elementExists (const QString &id) const |
QTransform | transformForElement (const QString &id) const |
Public Member Functions inherited from QObject | |
Q_INVOKABLE | QObject (QObject *parent=nullptr) |
Constructs an object with parent object parent. | |
virtual | ~QObject () |
Destroys the object, deleting all its child objects. | |
virtual bool | event (QEvent *event) |
This virtual function receives events to an object and should return true if the event e was recognized and processed. | |
virtual bool | eventFilter (QObject *watched, QEvent *event) |
Filters events if this object has been installed as an event filter for the watched object. | |
QString | objectName () const |
Q_WEAK_OVERLOAD void | setObjectName (const QString &name) |
Sets the object's name to name. | |
void | setObjectName (QAnyStringView name) |
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. | |
QBindable< QString > | bindableObjectName () |
bool | isWidgetType () const |
Returns true if the object is a widget; otherwise returns false . | |
bool | isWindowType () const |
Returns true if the object is a window; otherwise returns false . | |
bool | isQuickItemType () const |
Returns true if the object is a QQuickItem; otherwise returns false . | |
bool | signalsBlocked () const noexcept |
Returns true if signals are blocked; otherwise returns false . | |
bool | blockSignals (bool b) noexcept |
If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). | |
QThread * | thread () const |
Returns the thread in which the object lives. | |
bool | moveToThread (QThread *thread QT6_DECL_NEW_OVERLOAD_TAIL) |
Changes the thread affinity for this object and its children and returns true on success. | |
int | startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer) |
This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds. | |
int | startTimer (std::chrono::nanoseconds time, Qt::TimerType timerType=Qt::CoarseTimer) |
void | killTimer (int id) |
Kills the timer with timer identifier, id. | |
void | killTimer (Qt::TimerId id) |
template<typename T > | |
T | findChild (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const |
Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object. | |
template<typename T > | |
QList< T > | findChildren (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const |
Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. | |
template<typename T > | |
T | findChild (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const |
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. | |
template<typename T > | |
QList< T > | findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const |
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. | |
const QObjectList & | children () const |
Returns a list of child objects. | |
void | setParent (QObject *parent) |
Makes the object a child of parent. | |
void | installEventFilter (QObject *filterObj) |
Installs an event filter filterObj on this object. | |
void | removeEventFilter (QObject *obj) |
Removes an event filter object obj from this object. | |
QMetaObject::Connection | connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const |
bool | disconnect (const char *signal=nullptr, const QObject *receiver=nullptr, const char *member=nullptr) const |
bool | disconnect (const QObject *receiver, const char *member=nullptr) const |
void | dumpObjectTree () const |
Dumps a tree of children to the debug output. | |
void | dumpObjectInfo () const |
Dumps information about signal connections, etc. | |
bool | setProperty (const char *name, const QVariant &value) |
Sets the value of the object's name property to value. | |
bool | setProperty (const char *name, QVariant &&value) |
QVariant | property (const char *name) const |
Returns the value of the object's name property. | |
QList< QByteArray > | dynamicPropertyNames () const |
QBindingStorage * | bindingStorage () |
const QBindingStorage * | bindingStorage () const |
QObject * | parent () const |
Returns a pointer to the parent object. | |
bool | inherits (const char *classname) const |
Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false . | |
Properties | |
QRectF | viewBox |
the rectangle specifying the visible area of the document in logical coordinates | |
int | framesPerSecond |
the number of frames per second to be shown | |
int | currentFrame |
the current frame of the document's animation, or 0 if the document is not animated | |
Qt::AspectRatioMode | aspectRatioMode |
how rendering adheres to the SVG view box aspect ratio | |
QtSvg::Options | options |
bool | animationEnabled |
whether the animation should run, if the SVG is animated | |
Properties inherited from QObject | |
QString | objectName |
the name of this object | |
Additional Inherited Members | |
Static Public Member Functions inherited from QObject | |
static QMetaObject::Connection | connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection) |
\threadsafe | |
static QMetaObject::Connection | connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection) |
template<typename Func1 , typename Func2 > | |
static QMetaObject::Connection | connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType *context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection) |
template<typename Func1 , typename Func2 > | |
static QMetaObject::Connection | connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot) |
static bool | disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member) |
\threadsafe | |
static bool | disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member) |
static bool | disconnect (const QMetaObject::Connection &) |
Disconnect a connection. | |
template<typename Func1 , typename Func2 > | |
static bool | disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object *receiver, Func2 slot) |
template<typename Func1 > | |
static bool | disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const QObject *receiver, void **zero) |
Protected Member Functions inherited from QObject | |
QObject * | sender () const |
Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns \nullptr. | |
int | senderSignalIndex () const |
int | receivers (const char *signal) const |
Returns the number of receivers connected to the signal. | |
bool | isSignalConnected (const QMetaMethod &signal) const |
virtual void | timerEvent (QTimerEvent *event) |
This event handler can be reimplemented in a subclass to receive timer events for the object. | |
virtual void | childEvent (QChildEvent *event) |
This event handler can be reimplemented in a subclass to receive child events. | |
virtual void | customEvent (QEvent *event) |
This event handler can be reimplemented in a subclass to receive custom events. | |
virtual void | connectNotify (const QMetaMethod &signal) |
virtual void | disconnectNotify (const QMetaMethod &signal) |
QObject (QObjectPrivate &dd, QObject *parent=nullptr) | |
Protected Attributes inherited from QObject | |
QScopedPointer< QObjectData > | d_ptr |
Related Symbols inherited from QObject | |
template< class T > T | qobject_cast (const QObject *object) |
Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr. | |
template< typename T > T | qFindChildqFindChildren (const QObject *obj, const QString &name)() |
template< typename T > QList< T > | qFindChildrenqFindChildren (const QObject *obj, const QString &name)() |
QObjectList | |
\macro Q_CLASSINFO(Name, Value) | |
\inmodule QtSvg
The QSvgRenderer class is used to draw the contents of SVG files onto paint devices.
Using QSvgRenderer, Scalable Vector Graphics (SVG) can be rendered onto any QPaintDevice subclass, including QWidget, QImage, and QGLWidget.
QSvgRenderer provides an API that supports basic features of SVG rendering, such as loading and rendering of static drawings, and more interactive features like animation. Since the rendering is performed using QPainter, SVG drawings can be rendered on any subclass of QPaintDevice.
SVG drawings are either loaded when an QSvgRenderer is constructed, or loaded later using the load() functions. Data is either supplied directly as serialized XML, or indirectly using a file name. If a valid file has been loaded, either when the renderer is constructed or at some later time, isValid() returns true; otherwise it returns false. QSvgRenderer provides the render() slot to render the current document, or the current frame of an animated document, using a given painter.
The defaultSize() function provides information about the amount of space that is required to render the currently loaded SVG file. This is useful for paint devices, such as QWidget, that often need to supply a size hint to their parent layout. The default size of a drawing may differ from its visible area, found using the \l viewBox property.
Animated SVG drawings are supported, and can be controlled with a simple collection of functions and properties:
\list
Finally, the QSvgRenderer class provides the repaintNeeded() signal which is emitted whenever the rendering of the document needs to be updated.
Definition at line 23 of file qsvgrenderer.h.
Constructs a new renderer with the given parent.
Definition at line 124 of file qsvgrenderer.cpp.
Constructs a new renderer with the given parent and loads the contents of the SVG file with the specified filename.
Definition at line 133 of file qsvgrenderer.cpp.
References load().
QSvgRenderer::QSvgRenderer | ( | const QByteArray & | contents, |
QObject * | parent = nullptr ) |
Constructs a new renderer with the given parent and loads the SVG data from the byte array specified by contents.
Definition at line 143 of file qsvgrenderer.cpp.
References contents, and load().
Constructs a new renderer with the given parent and loads the SVG data using the stream reader specified by contents.
Definition at line 155 of file qsvgrenderer.cpp.
References contents, and load().
QSvgRenderer::~QSvgRenderer | ( | ) |
Destroys the renderer.
Definition at line 164 of file qsvgrenderer.cpp.
bool QSvgRenderer::animated | ( | ) | const |
Returns true if the current document contains animated elements; otherwise returns false.
Definition at line 222 of file qsvgrenderer.cpp.
References d.
int QSvgRenderer::animationDuration | ( | ) | const |
Returns the number of frames in the animation, or 0 if the current document is not animated.
Definition at line 376 of file qsvgrenderer.cpp.
References d.
Qt::AspectRatioMode QSvgRenderer::aspectRatioMode | ( | ) | const |
Definition at line 300 of file qsvgrenderer.cpp.
References d, Qt::IgnoreAspectRatio, and Qt::KeepAspectRatio.
Returns bounding rectangle of the item with the given id. The transformation matrix of parent elements is not affecting the bounds of the element.
Definition at line 520 of file qsvgrenderer.cpp.
References d.
Referenced by QGraphicsSvgItemPrivate::updateDefaultSize().
int QSvgRenderer::currentFrame | ( | ) | const |
Definition at line 353 of file qsvgrenderer.cpp.
References d.
QSize QSvgRenderer::defaultSize | ( | ) | const |
Returns the default size of the document contents.
Definition at line 181 of file qsvgrenderer.cpp.
References d.
Referenced by QSvgIconEngine::pixmap(), and QGraphicsSvgItemPrivate::updateDefaultSize().
bool QSvgRenderer::elementExists | ( | const QString & | id | ) | const |
Returns true if the element with the given id exists in the currently parsed SVG file and is a renderable element.
Note: this method returns true only for elements that can be rendered. Which implies that elements that are considered part of the fill/stroke style properties, e.g. radialGradients even tough marked with "id" attributes will not be found by this method.
Definition at line 543 of file qsvgrenderer.cpp.
References d.
int QSvgRenderer::framesPerSecond | ( | ) | const |
Definition at line 267 of file qsvgrenderer.cpp.
References d.
bool QSvgRenderer::isAnimationEnabled | ( | ) | const |
Definition at line 246 of file qsvgrenderer.cpp.
References d.
bool QSvgRenderer::isValid | ( | ) | const |
Returns true if there is a valid current document; otherwise returns false.
Definition at line 172 of file qsvgrenderer.cpp.
References d.
Referenced by QSvgIconEngine::addFile(), and QSvgIconEngine::pixmap().
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slot |
Loads the specified SVG format contents, returning true if the content was successfully parsed; otherwise returns false.
Definition at line 427 of file qsvgrenderer.cpp.
References contents, d, and loadDocument().
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slot |
Loads the SVG file specified by filename, returning true if the content was successfully parsed; otherwise returns false.
Definition at line 417 of file qsvgrenderer.cpp.
References d, and loadDocument().
Referenced by QSvgRenderer(), QSvgRenderer(), QSvgRenderer(), QSvgWidget::QSvgWidget(), and QSvgIconEnginePrivate::tryLoad().
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slot |
Loads the specified SVG in contents, returning true if the content was successfully parsed; otherwise returns false.
The reader will be used from where it currently is positioned. If contents is null
, behavior is undefined.
Definition at line 442 of file qsvgrenderer.cpp.
References contents, d, and loadDocument().
QtSvg::Options QSvgRenderer::options | ( | ) | const |
Definition at line 331 of file qsvgrenderer.cpp.
References d.
Renders the current document, or the current frame of an animated document, using the given painter.
Definition at line 452 of file qsvgrenderer.cpp.
Referenced by QSvgIconEngine::pixmap(), and QSvgIOHandler::read().
Renders the current document, or the current frame of an animated document, using the given painter on the specified bounds within the painter.
If bounds is not empty, the output will be scaled to fill it, ignoring any aspect ratio implied by the SVG.
Definition at line 487 of file qsvgrenderer.cpp.
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slot |
Renders the given element with elementId using the given painter on the specified bounds.
If the bounding rectangle is not specified the SVG element is mapped to the whole paint device.
Definition at line 472 of file qsvgrenderer.cpp.
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signal |
This signal is emitted whenever the rendering of the document needs to be updated, usually for the purposes of animation.
Referenced by QSvgRendererPrivate::ensureTimerCreated().
void QSvgRenderer::setAnimationEnabled | ( | bool | enable | ) |
Definition at line 252 of file qsvgrenderer.cpp.
References d.
Referenced by QSvgWidgetListener::eventFilter().
void QSvgRenderer::setAspectRatioMode | ( | Qt::AspectRatioMode | mode | ) |
Definition at line 308 of file qsvgrenderer.cpp.
References d, Qt::IgnoreAspectRatio, and Qt::KeepAspectRatio.
void QSvgRenderer::setCurrentFrame | ( | int | frame | ) |
Definition at line 362 of file qsvgrenderer.cpp.
void QSvgRenderer::setFramesPerSecond | ( | int | num | ) |
Definition at line 273 of file qsvgrenderer.cpp.
void QSvgRenderer::setOptions | ( | QtSvg::Options | flags | ) |
Definition at line 337 of file qsvgrenderer.cpp.
References d.
Definition at line 209 of file qsvgrenderer.cpp.
References d.
Definition at line 504 of file qsvgrenderer.cpp.
References d.
QTransform QSvgRenderer::transformForElement | ( | const QString & | id | ) | const |
Returns the transformation matrix for the element with the given id. The matrix is a product of the transformation of the element's parents. The transformation of the element itself is not included.
To find the bounding rectangle of the element in logical coordinates, you can apply the matrix on the rectangle returned from boundsOnElement().
Definition at line 565 of file qsvgrenderer.cpp.
References d.
QRect QSvgRenderer::viewBox | ( | ) | const |
Returns viewBoxF().toRect().
Definition at line 195 of file qsvgrenderer.cpp.
References d.
QRectF QSvgRenderer::viewBoxF | ( | ) | const |
Definition at line 495 of file qsvgrenderer.cpp.
References d.
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readwrite |
whether the animation should run, if the SVG is animated
Setting the property to false stops the animation timer. Setting the property to false starts the animation timer, provided that the SVG contains animated elements.
If the SVG is not animated, the property will have no effect. Otherwise, the property defaults to true.
Definition at line 32 of file qsvgrenderer.h.
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how rendering adheres to the SVG view box aspect ratio
The accepted modes are: \list
Definition at line 30 of file qsvgrenderer.h.
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readwrite |
the current frame of the document's animation, or 0 if the document is not animated
Definition at line 29 of file qsvgrenderer.h.
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readwrite |
the number of frames per second to be shown
The number of frames per second is 0 if the current document is not animated.
Definition at line 28 of file qsvgrenderer.h.
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readwrite |
This property holds a set of QtSvg::Option flags that can be used to enable or disable various features of the parsing and rendering of SVG files.
Set this property before calling any of the load functions to change the behavior of the QSvgRenderer.
By default, no flags are set.
Definition at line 31 of file qsvgrenderer.h.
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readwrite |
the rectangle specifying the visible area of the document in logical coordinates
Definition at line 27 of file qsvgrenderer.h.