An abstract base class for Constraints. More...

Inheritance diagram for Dali::Constraint:

Classes
class	Function
	Template for the Function that is called by the Constraint system. More...
Public Types
enum	RemoveAction
	Enumeration for the action that will happen when the constraint is removed. More...
Public Member Functions
	Constraint ()
	Creates an uninitialized Constraint; this can be initialized with Constraint::New().
Constraint	Clone (Handle handle)
	Creates a clone of this constraint for another object.
	~Constraint ()
	Destructor.
	Constraint (const Constraint &constraint)
	This copy constructor is required for (smart) pointer semantics.
Constraint &	operator= (const Constraint &rhs)
	This assignment operator is required for (smart) pointer semantics.
void	AddSource (ConstraintSource source)
	Adds a constraint source to the constraint.
void	Apply ()
	Applies this constraint.
void	Remove ()
	Removes this constraint.
Handle	GetTargetObject ()
	Retrieves the object which this constraint is targeting.
Dali::Property::Index	GetTargetProperty ()
	Retrieves the property which this constraint is targeting.
void	SetRemoveAction (RemoveAction action)
	Sets the remove action. Constraint::Bake will "bake" a value when fully-applied.
RemoveAction	GetRemoveAction () const
	Retrieves the remove action that will happen when the constraint is removed.
void	SetTag (const uint32_t tag)
	Sets a tag for the constraint so it can be identified later.
uint32_t	GetTag () const
	Gets the tag.
Static Public Member Functions
template<class P >
static Constraint	New (Handle handle, Property::Index targetIndex, void(*function)(P &, const PropertyInputContainer &))
	Creates a constraint which targets a property using a function or a static class member.
template<class P , class T >
static Constraint	New (Handle handle, Property::Index targetIndex, const T &object)
	Creates a constraint which targets a property using a functor object.
template<class P , class T >
static Constraint	New (Handle handle, Property::Index targetIndex, const T &object, void(T::*memberFunction)(P &, const PropertyInputContainer &))
	Creates a constraint which targets a property using an object method.
static Constraint	DownCast (BaseHandle baseHandle)
	Downcasts a handle to Constraint handle.
Static Public Attributes
static const RemoveAction	DEFAULT_REMOVE_ACTION
	Bake.

Detailed Description

An abstract base class for Constraints.

This can be used to constrain a property of an object, after animations have been applied. Constraints are applied in the following order:

Constraints are applied to on-stage actors in a depth-first traversal.
For each actor, the constraints are applied in the same order as the calls to Apply().
Constraints are not applied to off-stage actors.

Create a constraint using one of the New methods depending on the type of callback function used. Try to use a C function unless some data needs to be stored, otherwise functors and class methods are also supported.

A constraint can be applied to an object in the following manner:

 Handle handle = CreateMyObject();
 Constraint constraint = Constraint::New< Vector3 >( handle, CONSTRAINING_PROPERTY_INDEX, &MyFunction );
 constraint.AddSource( LocalSource( INPUT_PROPERTY_INDEX ) );
 constraint.Apply();

Since:: 3.0, DALi version 1.0.0

Member Enumeration Documentation

enum Dali::Constraint::RemoveAction

Enumeration for the action that will happen when the constraint is removed.

The final value may be "baked" i.e. saved permanently. Alternatively the constrained value may be discarded when the constraint is removed.

Since:: 3.0, DALi version 1.0.0

Enumerator:

Bake

When the constraint is fully-applied, the constrained value is saved.

Since:: 3.0, DALi version 1.0.0

Discard

When the constraint is removed, the constrained value is discarded.

Since:: 3.0, DALi version 1.0.0

Constructor & Destructor Documentation

Dali::Constraint::Constraint ( )

Creates an uninitialized Constraint; this can be initialized with Constraint::New().

Calling member functions with an uninitialized Constraint handle is not allowed.

Since:: 3.0, DALi version 1.0.0

Dali::Constraint::~Constraint ( )

Destructor.

This is non-virtual since derived Handle types must not contain data or virtual methods.

Since:: 3.0, DALi version 1.0.0

Dali::Constraint::Constraint ( const Constraint & constraint )

This copy constructor is required for (smart) pointer semantics.

Since:: 3.0, DALi version 1.0.0

Parameters:

[in] constraint A reference to the copied handle

Member Function Documentation

void Dali::Constraint::AddSource ( ConstraintSource source )

Adds a constraint source to the constraint.

Since:: 3.0, DALi version 1.0.0

Parameters:

[in] source The constraint source input to add

void Dali::Constraint::Apply ( )

Applies this constraint.

Since:: 3.0, DALi version 1.0.0

Precondition:: The constraint must be initialized.; The target object must still be alive.; The source inputs should not have been destroyed.

Constraint Dali::Constraint::Clone ( Handle handle )

Creates a clone of this constraint for another object.

Since:: 3.0, DALi version 1.0.0

Parameters:

[in] handle The handle to the property-owning object this constraint is to be cloned for

Returns:: The new constraint

static Constraint Dali::Constraint::DownCast ( BaseHandle baseHandle ) [static]

Downcasts a handle to Constraint handle.

If handle points to a Constraint object, the downcast produces valid handle. If not, the returned handle is left uninitialized.

Since:: 3.0, DALi version 1.0.0

Parameters:

[in] baseHandle BaseHandle to an object

Returns:: Handle to a Constraint object or an uninitialized handle

RemoveAction Dali::Constraint::GetRemoveAction ( ) const

Retrieves the remove action that will happen when the constraint is removed.

Since:: 3.0, DALi version 1.0.0

Returns:: The remove-action

uint32_t Dali::Constraint::GetTag ( ) const

Gets the tag.

Since:: 3.0, DALi version 1.0.0

Returns:: The tag

Handle Dali::Constraint::GetTargetObject ( )

Retrieves the object which this constraint is targeting.

Since:: 3.0, DALi version 1.0.0

Returns:: The target object

Dali::Property::Index Dali::Constraint::GetTargetProperty ( )

Retrieves the property which this constraint is targeting.

Since:: 3.0, DALi version 1.0.0

Returns:: The target property

template<class P >

static Constraint Dali::Constraint::New	(	Handle	handle,
		Property::Index	targetIndex,
		void(*)(P &, const PropertyInputContainer &)	function
	)		`[static]`

Creates a constraint which targets a property using a function or a static class member.

The expected signature, for a Vector3 type for example, of the function is:

   void MyFunction( Vector3&, const PropertyInputContainer& );

Create the constraint with this function as follows:

   Constraint constraint = Constraint::New< Vector3 >( handle, CONSTRAINING_PROPERTY_INDEX, &MyFunction );

Since:: 3.0, DALi version 1.0.0

Parameters:

[in]	handle	The handle to the property-owning object
[in]	targetIndex	The index of the property to constrain
[in]	function	The function to call to set the constrained property value

Template Parameters:

P	The type of the property to constrain

Returns:: The new constraint

template<class P , class T >

static Constraint Dali::Constraint::New	(	Handle	handle,
		Property::Index	targetIndex,
		const T &	object
	)		`[static]`

Creates a constraint which targets a property using a functor object.

The expected structure, for a Vector3 type for example, of the functor object is:

   struct MyObject
   {
     void operator() ( Vector3&, const PropertyInputContainer& );
   };

Create the constraint with this object as follows:

   Constraint constraint = Constraint::New< Vector3 >( handle, CONSTRAINING_PROPERTY_INDEX, MyObject() );

Since:: 3.0, DALi version 1.0.0

Parameters:

[in]	handle	The handle to the property-owning object
[in]	targetIndex	The index of the property to constraint
[in]	object	The functor object whose functor is called to set the constrained property value

Template Parameters:

P	The type of the property to constrain
T	The type of the object

Returns:: The new constraint

template<class P , class T >

static Constraint Dali::Constraint::New	(	Handle	handle,
		Property::Index	targetIndex,
		const T &	object,
		void(T::*)(P &, const PropertyInputContainer &)	memberFunction
	)		`[static]`

Creates a constraint which targets a property using an object method.

The expected structure, for a Vector3 type for example, of the object is:

   struct MyObject
   {
     void MyMethod( Vector3&, const PropertyInputContainer& );
   };

Create the constraint with this object as follows:

   Constraint constraint = Constraint::New< Vector3 >( handle, CONSTRAINING_PROPERTY_INDEX, MyObject(), &MyObject::MyMethod );

Since:: 3.0, DALi version 1.0.0

Parameters:

[in]	handle	The handle to the property-owning object
[in]	targetIndex	The index of the property to constraint
[in]	object	The object whose member function is called to set the constrained property value
[in]	memberFunction	The member function to call to set the constrained property value

Returns:: The new constraint

Template Parameters:

P	The type of the property to constrain
T	The type of the object

Constraint& Dali::Constraint::operator= ( const Constraint & rhs )

This assignment operator is required for (smart) pointer semantics.

Since:: 3.0, DALi version 1.0.0

Parameters:

[in] rhs A reference to the copied handle

Returns:: A reference to this

void Dali::Constraint::Remove ( )

Removes this constraint.

Since:: 3.0, DALi version 1.0.0

void Dali::Constraint::SetRemoveAction ( RemoveAction action )

Sets the remove action. Constraint::Bake will "bake" a value when fully-applied.

In case of Constraint::Discard, the constrained value will be discarded, when the constraint is removed. The default value is Constraint::Bake.

Since:: 3.0, DALi version 1.0.0

Parameters:

[in] action The remove-action

void Dali::Constraint::SetTag ( const uint32_t tag )

Sets a tag for the constraint so it can be identified later.

Since:: 3.0, DALi version 1.0.0

Parameters:

[in] tag An integer to identify the constraint

Classes

Public Types

Public Member Functions

Static Public Member Functions

Static Public Attributes

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation