Dali::BaseHandle is a handle to an internal Dali resource. More...

Inheritance diagram for Dali::BaseHandle:

Public Types
typedef void(BaseHandle::*	BooleanType )() const
	Pointer-to-member type. Objects can be implicitly converted to this for validity checks.
Public Member Functions
	BaseHandle (Dali::BaseObject *handle)
	This constructor is used by Dali New() methods.
	BaseHandle ()
	This constructor provides an uninitialized Dali::BaseHandle.
	~BaseHandle ()
	Dali::BaseHandle is intended as a base class.
	BaseHandle (const BaseHandle &handle)
	This copy constructor is required for (smart) pointer semantics.
BaseHandle &	operator= (const BaseHandle &rhs)
	This assignment operator is required for (smart) pointer semantics.
template<class T >
bool	ConnectSignal (ConnectionTrackerInterface *connectionTracker, const std::string &signalName, const T &functor)
	Connects a void() functor to a specified signal.
bool	DoAction (const std::string &actionName, const Property::Map &attributes)
	Performs an action on this object with the given action name and attributes.
const std::string &	GetTypeName () const
	Returns the type name for the Handle.
bool	GetTypeInfo (Dali::TypeInfo &info) const
	Returns the type info for the Handle.
BaseObject &	GetBaseObject ()
	Retrieves the internal Dali resource.
const BaseObject &	GetBaseObject () const
	Retrieves the internal Dali resource.
void	Reset ()
	Resets the handle.
	operator BooleanType () const
	Converts an handle to a BooleanType.
bool	operator== (const BaseHandle &rhs) const
	Equality operator overload.
bool	operator!= (const BaseHandle &rhs) const
	Inequality operator overload.
Dali::RefObject *	GetObjectPtr () const
	Gets the reference counted object pointer.
Protected Member Functions
void	ThisIsSaferThanReturningVoidStar () const
	Used by the safe bool idiom.

Detailed Description

Dali::BaseHandle is a handle to an internal Dali resource.

Each Dali handle consists of a single private pointer, and a set of non-virtual forwarding functions. This hides the internal implementation, so it may be modified without affecting the public interface.

Dali handles have implicit smart-pointer semantics. This avoids the need to match resource allocation methods like new/delete (the RAII idiom).

Dali handles can be copied by value. When a Dali handle is copied, both the copy and original will point to the same Dali resource.

The internal Dali resources are reference counted. copying a Dali handle will increase the reference count. A resource will not be deleted until all its Dali::BaseHandle handles are destroyed, or reset.

Since:: 3.0, DALi version 1.0.0

Constructor & Destructor Documentation

Dali::BaseHandle::BaseHandle ( Dali::BaseObject * handle )

This constructor is used by Dali New() methods.

Since:: 3.0, DALi version 1.0.0

Parameters:

[in] handle A pointer to a newly allocated Dali resource

Dali::BaseHandle::BaseHandle ( )

This constructor provides an uninitialized Dali::BaseHandle.

This should be initialized with a Dali New() method before use. Methods called on an uninitialized Dali::BaseHandle will assert.

 BaseHandle handle; // uninitialized
 handle.SomeMethod(); // unsafe! This will assert

 handle = SomeClass::New(); // now initialized
 handle.SomeMethod(); // safe

Since:: 3.0, DALi version 1.0.0

Dali::BaseHandle::~BaseHandle ( )

Dali::BaseHandle is intended as a base class.

This is non-virtual since derived BaseHandle types must not contain data.

Since:: 3.0, DALi version 1.0.0

Dali::BaseHandle::BaseHandle ( const BaseHandle & handle )

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

Since:: 3.0, DALi version 1.0.0

Parameters:

[in] handle A reference to the copied handle

Member Function Documentation

template<class T >

bool Dali::BaseHandle::ConnectSignal	(	ConnectionTrackerInterface *	connectionTracker,
		const std::string &	signalName,
		const T &	functor
	)

Connects a void() functor to a specified signal.

Since:: 3.0, DALi version 1.0.0

Parameters:

[in]	connectionTracker	A connection tracker which can be used to disconnect
[in]	signalName	Name of the signal to connect to
[in]	functor	The functor to copy

Returns:: True if the signal was available

Precondition:: The signal must be available in this object.

bool Dali::BaseHandle::DoAction	(	const std::string &	actionName,
		const Property::Map &	attributes
	)

Performs an action on this object with the given action name and attributes.

Usage example: -

 BaseHandle handle = SomeClass::New(); // Initialized with New() method

 Property::Map attributes; // Use empty Property::Map because "show" action doesn't need parameter
 handle.DoAction("show", attributes);

Since:: 3.0, DALi version 1.0.0

Parameters:

[in]	actionName	The command for the action
[in]	attributes	The list of attributes for the action

Returns:: The action is performed by the object or not

BaseObject& Dali::BaseHandle::GetBaseObject ( )

Retrieves the internal Dali resource.

This is useful for checking the reference count of the internal resource. This method will not check the validity of the handle so the caller is expected to check it by using if (handle).

Since:: 3.0, DALi version 1.0.0

Returns:: The BaseObject which is referenced by the BaseHandle

const BaseObject& Dali::BaseHandle::GetBaseObject ( ) const

Retrieves the internal Dali resource.

This is useful for checking the reference count of the internal resource. This method will not check the validity of the handle so the caller is expected to check it by using if (handle).

Since:: 3.0, DALi version 1.0.0

Returns:: The BaseObject which is referenced by the BaseHandle

Dali::RefObject* Dali::BaseHandle::GetObjectPtr ( ) const

Gets the reference counted object pointer.

Since:: 3.0, DALi version 1.0.0

Returns:: A pointer to the reference counted object

bool Dali::BaseHandle::GetTypeInfo ( Dali::TypeInfo & info ) const

Returns the type info for the Handle.

Since:: 3.0, DALi version 1.0.0

Parameters:

[in] info The type information

Returns:: The type info

const std::string& Dali::BaseHandle::GetTypeName ( ) const

Returns the type name for the Handle.

Will return an empty string if the typename does not exist. This will happen for types that have not registered with type-registry.

Since:: 3.0, DALi version 1.0.0

Returns:: The type name. Empty string if the typename does not exist

Dali::BaseHandle::operator BooleanType ( ) const

Converts an handle to a BooleanType.

This is useful for checking whether the handle is empty.

Since:: 3.0, DALi version 1.0.0

bool Dali::BaseHandle::operator!= ( const BaseHandle & rhs ) const

Inequality operator overload.

Since:: 3.0, DALi version 1.0.0

Parameters:

[in] rhs A reference to the compared handle

Returns:: True if the handle handles point to the different Dali resources

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

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

It makes this handle use the same BaseObject as the copied handle

Since:: 3.0, DALi version 1.0.0

Parameters:

[in] rhs A reference to the copied handle

Returns:: A reference to this handle

bool Dali::BaseHandle::operator== ( const BaseHandle & rhs ) const

Equality operator overload.

Since:: 3.0, DALi version 1.0.0

Parameters:

[in] rhs A reference to the compared handle

Returns:: True if the handle handles point to the same Dali resource, or if both are NULL

void Dali::BaseHandle::Reset ( )

Resets the handle.

If no other handle copies exist, the internal Dali resouce will be deleted. Calling this is not required i.e. it will happen automatically when a Dali::BaseHandle is destroyed.

Since:: 3.0, DALi version 1.0.0

Reimplemented in Dali::Toolkit::AccessibilityManager.

void Dali::BaseHandle::ThisIsSaferThanReturningVoidStar ( ) const [protected]

Used by the safe bool idiom.

The safe bool idiom basically provides a Boolean test for classes. It validates objects in a boolean context without the usual harmful side effects.

Since:: 3.0, DALi version 1.0.0

Public Types

Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation