Kanzi  3.9.9
Kanzi Engine C++ API
kanzi::KeyframeAnimation< TValueType > Class Template Reference

Template class for keyframe animations. More...

#include <kanzi/core.ui/animation/keyframe_animation.hpp>

Inheritance diagram for kanzi::KeyframeAnimation< TValueType >:
[legend]

Classes

class  BezierKeyframe
 Use bezier keyframes to animate property value along a bezier curve. More...
 
class  Keyframe
 Keyframe defines a value for the animated property at a specific time in an animation timeline. More...
 
class  LinearKeyframe
 Use linear keyframes to interpolate animated property value linearly between keyframes. More...
 
class  StepKeyframe
 Use Step keyframes to keep the value of the current keyframe constant up until the following keyframe. More...
 

Public Types

typedef unique_ptr< BezierKeyframeBezierKeyframePtr
 
typedef flat_map< chrono::milliseconds, KeyframePtrKeyframeContainer
 
typedef unique_ptr< KeyframeKeyframePtr
 
typedef unique_ptr< LinearKeyframeLinearKeyframePtr
 
typedef unique_ptr< StepKeyframeStepKeyframePtr
 
- Public Types inherited from kanzi::PropertyObject
typedef PropertyStorageContainer::const_iterator PropertyStorageConstIterator
 
typedef vector< PropertyStoragePtrPropertyStorageContainer
 
typedef PropertyStorageContainer::iterator PropertyStorageIterator
 
typedef intrusive_ptr< AbstractPropertyTypeDescriptor::PropertyStoragePropertyStoragePtr
 
typedef PropertyStorageContainer::reverse_iterator PropertyStorageReverseIterator
 

Public Member Functions

void addBezierKeyframe (chrono::milliseconds time, const TValueType &value, const Vector2 &p0, const Vector2 &p1)
 
void addKeyframe (chrono::milliseconds timeStamp, KeyframePtr keyframe)
 Adds a keyframe to given timestamp. More...
 
void addLinearKeyframe (chrono::milliseconds time, const TValueType &value)
 
void addStepKeyframe (chrono::milliseconds time, const TValueType &value)
 
KeyframegetKeyFrame (size_t index)
 Returns keyframe by index. More...
 
size_t getKeyFrameCount ()
 Returns the number of keyframes in this animation. More...
 
chrono::milliseconds getTimestamp (size_t index)
 Returns timestamp by index. More...
 
TValueType getValue (const TValueType &currentValue, chrono::milliseconds time) override
 Returns the value for the animated property at a given time. More...
 
- Public Member Functions inherited from kanzi::AbstractAnimation
optional< chrono::milliseconds > getDuration ()
 Returns the duration of the animation. More...
 
 ~AbstractAnimation () override
 Destructor. More...
 
- Public Member Functions inherited from kanzi::Object
AppliedStyleEntrySharedPtr applyObjectStyle (kanzi::StyleSharedPtr style)
 Applies a style to an object. More...
 
void applyObjectStyles ()
 Apply all styles for an object node. More...
 
DomaingetDomain () const
 Returns the domain the object belongs to. More...
 
const MetaclassgetDynamicMetaclass () const override
 Returns the metaclass of the dynamic type of the object. More...
 
MainLoopSchedulergetMainLoopScheduler () const
 Returns the MainLoopScheduler instance of the associated Domain. More...
 
detail::MessageDispatcher * getMessageDispatcher () const
 Returns the message dispatcher of the object. More...
 
ResourceManagergetResourceManager () const
 Returns the resource manager of the object. More...
 
ScriptingContextSharedPtr getScriptingContext () const
 Gets the scripting context of the object. More...
 
 Object (Domain *domain)
 
void setScriptingContext (ScriptingContextSharedPtr context)
 Sets the scripting context of the object. More...
 
void unapplyObjectStyle (AppliedStyleEntrySharedPtr appliedStyleEntry)
 
void unapplyObjectStyles ()
 Unapplies and removes all applied styles. More...
 
 ~Object () override
 
- Public Member Functions inherited from kanzi::MetaObject
bool isTypeOf (const Metaclass *objectType) const
 Determines if the type of this object is the given type or derived from it. More...
 
virtual ~MetaObject ()
 
- Public Member Functions inherited from kanzi::PropertyObject
template<typename DataType >
void addPropertyModifier (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::ModifierCallback callback, void *owner)
 
template<typename DataType >
void addPropertyModifierWithoutNotifyingHandlers (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::ModifierCallback callback, void *owner)
 Adds a property modifier without notifying handlers. More...
 
template<typename DataType >
void addPropertyNotificationHandler (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::NotificationCallback callback, void *owner)
 
template<typename DataType >
void addPropertyValueSource (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::TypedValueSource *valueSource, PropertyValuePrecedence precedence, void *ownerPointer)
 
template<typename DataType >
void addPropertyValueSource (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::TypedValueSource *valueSource, PropertyValuePrecedence precedence, AbstractPropertyTypeDescriptor::ValueSourceOwner *owner)
 
PropertyStorageContainer::iterator beginPropertyStorage ()
 Returns the begin iterator to the internal property storage container. More...
 
PropertyStorageContainer::const_iterator beginPropertyStorage () const
 Returns the begin iterator to the internal property storage container. More...
 
void clearPropertyFlag (AbstractPropertyType propertyType, uint32_t flag)
 
void copyLocalValue (const PropertyObject &other, AbstractPropertyType propertyType)
 Copies local value of single property from another object. More...
 
void copyLocalValues (const PropertyObject &other)
 Copies all local values from another object. More...
 
PropertyStorageContainer::iterator endPropertyStorage ()
 Returns the end iterator to the internal property storage container. More...
 
PropertyStorageContainer::const_iterator endPropertyStorage () const
 Returns the end iterator to the internal property storage container. More...
 
template<typename DataType >
PropertyType< DataType >::Traits::ReturnType getAbstractProperty (AbstractPropertyType abstractPropertyType) const
 
template<typename DataType >
PropertyType< DataType >::Traits::ReturnType getAbstractPropertyBase (AbstractPropertyType abstractPropertyType) const
 
template<typename DataType >
optional< typename PropertyType< DataType >::Traits::ReturnType > getOptionalAbstractProperty (AbstractPropertyType abstractPropertyType) const
 
template<typename DataType >
optional< typename PropertyType< DataType >::Traits::ReturnType > getOptionalProperty (const PropertyType< DataType > &propertyType) const
 Evaluates the property value in the same way as the overload above but does not default to the value in property metadata if there are no inputs to the property value. More...
 
template<typename DataType >
optional< typename PropertyType< DataType >::Traits::ReturnType > getOptionalPropertyBase (const PropertyType< DataType > &propertyType) const
 Returns the current value of a property disregarding modifiers, but does not default to the value in property metadata if there are no inputs to the property value. More...
 
template<typename DataType >
PropertyType< DataType >::Traits::ReturnType getProperty (const PropertyType< DataType > &propertyType) const
 Returns the current value of a property type. More...
 
template<typename DataType >
PropertyType< DataType >::Traits::ReturnType getPropertyBase (const PropertyType< DataType > &propertyType) const
 Returns the current value of a property disregarding modifiers. More...
 
template<typename DataType >
size_t getPropertyNotificationHandlerCount (const PropertyType< DataType > &propertyType) const
 Gets number of current notification handlers for given property type. More...
 
bool hasBaseValue (AbstractPropertyType propertyType) const
 Evaluates whether there are any inputs into the property value, disregarding modifiers. More...
 
bool hasLocalValue (AbstractPropertyType propertyType) const
 Evaluates whether there is a local value set for the property. More...
 
bool hasNonClassValue (AbstractPropertyType propertyType) const
 Evaluates whether there is a value of any precedence higher than class default value set for the property. More...
 
bool hasValue (AbstractPropertyType propertyType) const
 Evaluates whether there are any inputs into the property value. More...
 
bool isPropertyFlagSet (AbstractPropertyType propertyType, uint32_t flag) const
 
virtual void onPropertyChanged (AbstractPropertyType propertyType, PropertyNotificationReason reason)
 Virtual function to handle property change notifications. More...
 
 PropertyObject ()
 
void removeKzbProperties (flat_set< AbstractPropertyType > *keepProperties)
 Remove all KZB properties that are not included in a given set. More...
 
void removeKzbProperties ()
 Remove all KZB properties. More...
 
template<typename DataType >
void removeLocalPropertyValueSource (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::TypedValueSource *valueSource, void *ownerPointer)
 
void removeLocalValue (AbstractPropertyType propertyType)
 Removes the local value associated with the property. More...
 
template<typename DataType >
void removePropertyModifier (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::ModifierCallback callback, void *owner)
 
template<typename DataType >
void removePropertyNotificationHandler (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::NotificationCallback callback, void *owner)
 
template<typename DataType >
void removePropertyValueSource (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::TypedValueSource *valueSource, void *ownerPointer)
 
template<typename DataType >
void setAbstractProperty (AbstractPropertyType abstractPropertyType, typename PropertyType< DataType >::Traits::ParameterType value)
 
template<typename DataType >
void setProperty (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Traits::ParameterType value)
 Sets the local value of a property type. More...
 
void setPropertyFlag (AbstractPropertyType propertyType, uint32_t flag)
 
KZ_DEPRECATED void validatePropertyModifiers (AbstractPropertyType propertyType)
 Validates property modifiers and notifies handlers. More...
 
void validatePropertyModifiersAndNotifyHandlers (AbstractPropertyType propertyType)
 Validates property modifiers and notifies handlers. More...
 
virtual ~PropertyObject ()
 

Static Public Member Functions

static shared_ptr< KeyframeAnimationcreate (Domain *domain)
 Creates Keyframe animation. More...
 
static PropertyTypeEditorInfoSharedPtr makeEditorInfo ()
 
- Static Public Member Functions inherited from kanzi::Object
static const MetaclassgetStaticMetaclass ()
 Returns the metaclass of Object class. More...
 
static PropertyTypeEditorInfoSharedPtr makeEditorInfo ()
 Default implementation that returns empty editor info. More...
 
- Static Public Member Functions inherited from kanzi::MetaObject
static const MetaclassgetStaticMetaclass ()
 Returns the metaclass of Object class. More...
 
static PropertyTypeEditorInfoSharedPtr makeEditorInfo ()
 Default implementation that returns empty editor info. More...
 

Protected Member Functions

optional< chrono::milliseconds > getDurationOverride () override
 Virtual function the derived classes should overload to return duration. More...
 
 KeyframeAnimation (Domain *domain)
 Constructor. More...
 
- Protected Member Functions inherited from kanzi::ValueAnimation< TValueType >
 ValueAnimation (Domain *domain)
 Constructor. More...
 
- Protected Member Functions inherited from kanzi::AbstractAnimation
 AbstractAnimation (Domain *domain)
 Constructor. More...
 
- Protected Member Functions inherited from kanzi::Object
void initialize ()
 
void onCopy (const Object &other)
 
- Protected Member Functions inherited from kanzi::MetaObject
void initialize ()
 
 MetaObject ()
 
- Protected Member Functions inherited from kanzi::PropertyObject
AbstractPropertyTypeDescriptor::ValueSourceEntryacquireLocalValueSourceEntry (AbstractPropertyTypeDescriptor &descriptor, PropertyStoragePtr &propertyStorage)
 Acquires a local value source entry that is free for the assignment of a value. More...
 
AbstractPropertyTypeDescriptor::ModifierStorageacquireModifierStorage (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::PropertyStorage &propertyStorage)
 
AbstractPropertyTypeDescriptor::NotificationStorageacquireNotificationStorage (AbstractPropertyTypeDescriptor &descriptor)
 
PropertyStoragePtr acquirePropertyStorage (AbstractPropertyTypeDescriptor &descriptor)
 
template<typename DataType >
void addPropertyModifierBase (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::ModifierCallback callback, void *owner, bool notify)
 Adds a property modifier entry to the property modifier stack and validates them. More...
 
void addPropertyValueSource (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::ValueSource *valueSource, PropertyValuePrecedence precedence, void *ownerPointer)
 Internally adds a property value source. More...
 
void addPropertyValueSource (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::ValueSource *valueSource, PropertyValuePrecedence precedence, AbstractPropertyTypeDescriptor::ValueSourceOwner *owner)
 Internally adds a property value source. More...
 
AbstractPropertyTypeDescriptor::ValueSourceEntryconstructLocalValueSourceEntry (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::PropertyStorage &propertyStorage)
 
PropertyStoragePtr constructPropertyStorage (AbstractPropertyTypeDescriptor &descriptor)
 
void copyLocalValue (const AbstractPropertyTypeDescriptor::PropertyStorage &otherPropertyStorage)
 Copy local value from property storage. More...
 
AbstractPropertyTypeDescriptor::ModifierStoragefindModifierStorage (AbstractPropertyTypeDescriptor &descriptor)
 
AbstractPropertyTypeDescriptor::NotificationStoragefindNotificationStorage (AbstractPropertyTypeDescriptor &descriptor) const
 
AbstractPropertyTypeDescriptor::PropertyStoragefindPropertyStorage (AbstractPropertyTypeDescriptor &descriptor) const
 Gets the property storage for given property type descriptor. More...
 
PropertyStoragePtr findPropertyStoragePtr (AbstractPropertyTypeDescriptor &descriptor) const
 Gets property storage intrusive pointer which you can use to hold a reference until the end of the operation. More...
 
AbstractPropertyTypeDescriptorfindPropertyTypeDescriptorByNameAndDataType (string_view name, PropertyDataType dataType) const
 Finds a property type descriptor by name and data type. More...
 
AbstractPropertyTypeDescriptorfindPropertyTypeDescriptorByQualifiedNameAndDataType (string_view qualifiedName, PropertyDataType dataType) const
 Like findPropertyTypeDescriptorByNameAndDataType, but only searches by matching with qualified names. More...
 
AbstractPropertyTypeDescriptorfindPropertyTypeDescriptorByUnqualifiedNameAndDataType (string_view unqualifiedName, PropertyDataType dataType) const
 Like findPropertyTypeDescriptorByNameAndDataType, but only searches by matching with unqualified names. More...
 
AbstractPropertyTypeDescriptor::ValueSourcegetClassValueSource (AbstractPropertyTypeDescriptor &descriptor) const
 
AbstractPropertyTypeDescriptor::ValueSourcegetFinalValueSource (AbstractPropertyTypeDescriptor &descriptor) const
 
AbstractPropertyTypeDescriptor::ValueSourcegetNonClassValueSource (AbstractPropertyTypeDescriptor &descriptor) const
 
AbstractPropertyTypeDescriptor::ValueSourcegetTopValueSource (AbstractPropertyTypeDescriptor &descriptor) const
 Gets the top-level value source for a given property descriptor. More...
 
virtual void notifyPropertyHandlers (PropertyStoragePtr &storagePtr, PropertyNotificationReason reason)
 Notifies all property handlers on a property storage. More...
 
void onCopy (const PropertyObject &other)
 
void removeLocalValue (AbstractPropertyTypeDescriptor &descriptor, PropertyStoragePtr &propertyStorage)
 Removes a local value from the given property storage. More...
 
void removePropertyValueSource (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::ValueSource *valueSource, void *owner)
 Removes a property value source. More...
 
void validatePropertyModifiers (PropertyStoragePtr &propertyStorage)
 Validates property modifiers without notifying handlers. More...
 
void validatePropertyModifiersAndNotifyHandlers (PropertyStoragePtr &propertyStorage)
 Validates property modifiers and notifies handlers. More...
 

Additional Inherited Members

- Protected Types inherited from kanzi::Object
typedef vector< AppliedStyleEntrySharedPtrAppliedStyleContainer
 Applied style container. More...
 
- Protected Attributes inherited from kanzi::Object
AppliedStyleContainer m_appliedStyles
 Listing of applied styles applied to this object. More...
 

Detailed Description

template<typename TValueType>
class kanzi::KeyframeAnimation< TValueType >

Template class for keyframe animations.

Template Parameters
TValueTypeDefines the type of the value you want to animate. For example, float, bool, int, ColorRGBA.

The Kanzi animation system consists animations and timelines: animations define how to animate a property, and timelines map the animations to time and to objects you want to animate.

Keyframe animation uses keyframes that define the property value and time at which the animation reaches that value. In Kanzi you can create linear, step, and Bezier keyframes.

Examples

To create a keyframe animation:

// Create a float keyframe animation.
// Create and add keyframes to the keyframe animation. This keyframe animation contains two linear keyframes.
// Create a linear keyframe at second 0 with the value 0.
keyframeAnimation->addLinearKeyframe(chrono::seconds::zero(), 0.0f);
// Create a linear keyframe at second 1 with the value 100.
keyframeAnimation->addLinearKeyframe(chrono::seconds(1), 100.0f);

To animate a property value in a node using a keyframe animation:

// Create a property timeline and apply the keyframeAnimation keyframe animation to the Layout Width property
// to animate the width of the current node.

To animate a property field value in a node using a keyframe animation:

// Create a property field animation timeline and apply it to the Render Transformation property of the current node.
// Rotate the current node by animating the Rotation Z property field of the Render Transformation property
// with the keyframeAnimation keyframe animation.
propertyFieldTimeline->addEntry(PropertyFieldRotationZ, keyframeAnimation);

To create a keyframe animation that uses Bezier keyframes to move an object on a sideways figure eight shaped path:

// Create two float keyframe animations: one to animate the object on the x axis,
// the other to animate the object on the y axis.
// Create float keyframe animation keyframeAnimationX that uses linear keyframes
// to animate the movement of the object on the x axis.
// Create a linear keyframe at second 0 with the value 0.
keyframeAnimationX->addLinearKeyframe(chrono::seconds::zero(), 0.0f);
// Create a linear keyframe at second 4 with the value 4.
// At this keyframe the object reaches the furthest point on the x axis.
keyframeAnimationX->addLinearKeyframe(chrono::seconds(4), 4.0f);
// Create a linear keyframe at second 8 with the value 0.
// At this keyframe the object returns to the same position it had at the first keyframe.
keyframeAnimationX->addLinearKeyframe(chrono::seconds(8), 0.0f);
// Create float keyframe animation keyframeAnimationY that uses Bezier keyframes
// to animate the movement of the object on the y axis.
// Create a linear keyframe at second 0 with the value 0. When you use Bezier keyframes,
// you can use any type of keyframe for the first keyframe, because you need this keyframe
// only to provide the information for the starting position.
keyframeAnimationY->addLinearKeyframe(chrono::seconds::zero(), 0.0f);
// Create a Bezier keyframe at second 4 with the value 0 and two control points.
// You use the control points to set the position of the keyframe.
keyframeAnimationY->addBezierKeyframe(chrono::seconds(4), 0.0f, Vector2(0.5f, 4.0f), Vector2(0.5f, -4.0f));
// Create a Bezier keyframe at second 8 with the value 0 and two control points.
// This keyframe uses the same control points, but because the keyframeAnimationX
// animation moves the object on the x axis back to its starting position, this keyframe
// is a mirror image of the previous keyframe.
keyframeAnimationY->addBezierKeyframe(chrono::seconds(8), 0.0f, Vector2(0.5f, 4.0f), Vector2(0.5f, -4.0f));
// Create a property field animation timeline and apply it to the Render Transformation property of the current node.
// Move the current node on the x axis by animating the Translation X property field of the Render Transformation property
// with the keyframeAnimationX keyframe animation.
timeline->addEntry(PropertyFieldTranslationX, keyframeAnimationX);
// Move the current node on the y axis by animating the Translation Y property field of the Render Transformation property
// with the keyframeAnimationY keyframe animation.
timeline->addEntry(PropertyFieldTranslationY, keyframeAnimationY);

To play an animation regardless of the timeline type:

// Create the playback context and the timeline playback for the node defined in the item2d.
SceneGraphTimelinePlaybackContext context(*item2d);
// Create the playback for the timeline defined in the propertyFieldTimeline.
TimelinePlaybackSharedPtr playback = propertyFieldTimeline->createPlayback(context);
// Start the animation.
domain->getRootTimelineClock()->addTimelinePlayback(playback);

Member Typedef Documentation

template<typename TValueType >
typedef unique_ptr<Keyframe> kanzi::KeyframeAnimation< TValueType >::KeyframePtr
template<typename TValueType >
typedef flat_map<chrono::milliseconds, KeyframePtr> kanzi::KeyframeAnimation< TValueType >::KeyframeContainer
template<typename TValueType >
typedef unique_ptr<StepKeyframe> kanzi::KeyframeAnimation< TValueType >::StepKeyframePtr
template<typename TValueType >
typedef unique_ptr<LinearKeyframe> kanzi::KeyframeAnimation< TValueType >::LinearKeyframePtr
template<typename TValueType >
typedef unique_ptr<BezierKeyframe> kanzi::KeyframeAnimation< TValueType >::BezierKeyframePtr

Constructor & Destructor Documentation

template<typename TValueType >
kanzi::KeyframeAnimation< TValueType >::KeyframeAnimation ( Domain domain)
inlineexplicitprotected

Constructor.

Member Function Documentation

template<typename TValueType >
static PropertyTypeEditorInfoSharedPtr kanzi::KeyframeAnimation< TValueType >::makeEditorInfo ( )
inlinestatic
template<typename TValueType >
static shared_ptr<KeyframeAnimation> kanzi::KeyframeAnimation< TValueType >::create ( Domain domain)
inlinestatic

Creates Keyframe animation.

Parameters
domainThe domain to which you want the keyframe animation to belong.
template<typename TValueType >
void kanzi::KeyframeAnimation< TValueType >::addKeyframe ( chrono::milliseconds  timeStamp,
KeyframePtr  keyframe 
)
inline

Adds a keyframe to given timestamp.

Parameters
timeStampTimestamp to add to.
keyframeKeyframe unique pointer.
template<typename TValueType >
chrono::milliseconds kanzi::KeyframeAnimation< TValueType >::getTimestamp ( size_t  index)
inline

Returns timestamp by index.

Parameters
indexIndex.
Returns
Timestamp at index.
template<typename TValueType >
size_t kanzi::KeyframeAnimation< TValueType >::getKeyFrameCount ( )
inline

Returns the number of keyframes in this animation.

Returns
The number of keyframes in this animation.
template<typename TValueType >
Keyframe& kanzi::KeyframeAnimation< TValueType >::getKeyFrame ( size_t  index)
inline

Returns keyframe by index.

To get an interpolated animation value at a time, use getValue() instead.

Parameters
indexIndex.
Returns
Keyframe at index.
template<typename TValueType >
void kanzi::KeyframeAnimation< TValueType >::addStepKeyframe ( chrono::milliseconds  time,
const TValueType &  value 
)
inline
template<typename TValueType >
void kanzi::KeyframeAnimation< TValueType >::addLinearKeyframe ( chrono::milliseconds  time,
const TValueType &  value 
)
inline
template<typename TValueType >
void kanzi::KeyframeAnimation< TValueType >::addBezierKeyframe ( chrono::milliseconds  time,
const TValueType &  value,
const Vector2 p0,
const Vector2 p1 
)
inline
template<typename TValueType >
TValueType kanzi::KeyframeAnimation< TValueType >::getValue ( const TValueType &  currentValue,
chrono::milliseconds  time 
)
inlineoverridevirtual

Returns the value for the animated property at a given time.

Parameters
currentValueThe current value of the animated property.
timeTime relative since the beginning of the animation.
Returns
The value of the animated property at a given time.

Implements kanzi::ValueAnimation< TValueType >.

template<typename TValueType >
optional<chrono::milliseconds> kanzi::KeyframeAnimation< TValueType >::getDurationOverride ( )
inlineoverrideprotectedvirtual

Virtual function the derived classes should overload to return duration.

Default implementation returns nullopt to indicate infinite animation.

Reimplemented from kanzi::AbstractAnimation.


The documentation for this class was generated from the following file: