Tizen Native API  5.5
Public Types | Public Member Functions | Static Public Member Functions | Static Public Attributes
Dali::Stage Class Reference
Common

The Stage is a top-level object used for displaying a tree of Actors. More...

Inheritance diagram for Dali::Stage:
Dali::BaseHandle

Public Types

typedef Signal< void(const
KeyEvent &) > 		KeyEventSignalType
 Key event signal type.
typedef Signal< void() > EventProcessingFinishedSignalType
 Event Processing finished signal type.
typedef Signal< void(const
TouchEvent &) > 		TouchedSignalType
 Touched signal type.
typedef Signal< void(const
TouchData &) > 		TouchSignalType
 Touch signal type.
typedef Signal< void(const
WheelEvent &) > 		WheelEventSignalType
 Touched signal type.
typedef Signal< void() > ContextStatusSignal
 Context status signal type.
typedef Signal< void() > SceneCreatedSignalType
 Scene created signal type.

Public Member Functions

 Stage ()
 Allows the creation of an empty stage handle.
 ~Stage ()
 Destructor.
 Stage (const Stage &handle)
 This copy constructor is required for (smart) pointer semantics.
Stage & operator= (const Stage &rhs)
 This assignment operator is required for (smart) pointer semantics.
void Add (Actor &actor)
 Adds a child Actor to the Stage.
void Remove (Actor &actor)
 Removes a child Actor from the Stage.
Vector2 GetSize () const
 Returns the size of the Stage in pixels as a Vector.
RenderTaskList GetRenderTaskList () const
 Retrieves the list of render-tasks.
uint32_t GetLayerCount () const
 Queries the number of on-stage layers.
Layer GetLayer (uint32_t depth) const
 Retrieves the layer at a specified depth.
Layer GetRootLayer () const
 Returns the Stage's Root Layer.
void SetBackgroundColor (Vector4 color)
 Sets the background color of the stage.
Vector4 GetBackgroundColor () const
 Retrieves the background color of the stage.
Vector2 GetDpi () const
 Retrieves the DPI of the display device to which the stage is connected.
ObjectRegistry GetObjectRegistry () const
 Gets the Object registry.
void KeepRendering (float durationSeconds)
 Keep rendering for at least the given amount of time.
KeyEventSignalType & KeyEventSignal ()
 This signal is emitted when key event is received.
EventProcessingFinishedSignalType & EventProcessingFinishedSignal ()
 This signal is emitted just after the event processing is finished.
TouchedSignalType & TouchedSignal () DALI_DEPRECATED_API
 This signal is emitted when the screen is touched and when the touch ends (i.e. the down & up touch events only).
TouchSignalType & TouchSignal ()
 This signal is emitted when the screen is touched and when the touch ends (i.e. the down & up touch events only).
WheelEventSignalType & WheelEventSignal ()
 This signal is emitted when wheel event is received.
ContextStatusSignal & ContextLostSignal ()
 This signal is emitted when the GL context is lost (Platform specific behaviour).
ContextStatusSignal & ContextRegainedSignal ()
 This signal is emitted when the GL context is regained (Platform specific behavior).
SceneCreatedSignalType & SceneCreatedSignal ()
 This signal is emitted after the initial scene is created.

Static Public Member Functions

static Stage GetCurrent ()
 Gets the current Stage.
static bool IsInstalled ()
 Queries whether the Stage exists; this should only return false during or after destruction of Dali core.

Static Public Attributes

static const Vector4 DEFAULT_BACKGROUND_COLOR
 Default black background.
static const Vector4 DEBUG_BACKGROUND_COLOR
 Green background, useful when debugging.

Detailed Description

The Stage is a top-level object used for displaying a tree of Actors.

Stage is a top-level object that represents the entire screen. It is used for displaying a hierarchy of actors managed by the scene graph structure, which means an actor inherits a position relative to its parent, and can be moved in relation to this point.

The stage instance is a singleton object (the only instance of its class during the lifetime of the program). You can get it using a static function.

To display the contents of an actor, it must be added to a stage. The following example shows how to connect a new actor to the stage: 

 Actor actor = Actor::New();
 Stage::GetCurrent().Add( actor );

The stage has a 2D size that matches the size of the application window. The default unit 1 is 1 pixel with the default camera.

Multiple stage/window support is not currently provided.

Signals | Signal Name | Method | |-------------------------|--------------------------------------| | keyEvent | KeyEventSignal() | | eventProcessingFinished | EventProcessingFinishedSignal() | | touched | TouchedSignal() | | wheelEvent | WheelEventSignal() | | contextLost | ContextLostSignal() | | contextRegained | ContextRegainedSignal() | | sceneCreated | SceneCreatedSignal() |

Since:
2.4, DALi version 1.0.0

Member Typedef Documentation

typedef Signal< void () > Dali::Stage::ContextStatusSignal

Context status signal type.

Since:
2.4, DALi version 1.0.0
typedef Signal< void () > Dali::Stage::EventProcessingFinishedSignalType

Event Processing finished signal type.

Since:
2.4, DALi version 1.0.0
typedef Signal< void (const KeyEvent&) > Dali::Stage::KeyEventSignalType

Key event signal type.

Since:
2.4, DALi version 1.0.0
typedef Signal< void () > Dali::Stage::SceneCreatedSignalType

Scene created signal type.

Since:
2.4, DALi version 1.0.0
typedef Signal< void (const TouchEvent&) > Dali::Stage::TouchedSignalType

Touched signal type.

Deprecated:
Deprecated since 3.0, DALi version 1.1.37
Since:
2.4, DALi version 1.0.0
typedef Signal< void (const TouchData&) > Dali::Stage::TouchSignalType

Touch signal type.

Since:
3.0, DALi version 1.1.37
typedef Signal< void (const WheelEvent&) > Dali::Stage::WheelEventSignalType

Touched signal type.

Since:
2.4, DALi version 1.0.0

Constructor & Destructor Documentation

Dali::Stage::Stage ( )

Allows the creation of an empty stage handle.

To retrieve the current stage, this handle can be set using Stage::GetCurrent().

Since:
2.4, DALi version 1.0.0
Dali::Stage::~Stage ( )

Destructor.

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

Since:
2.4, DALi version 1.0.0
Dali::Stage::Stage ( const Stage &  handle)

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

Since:
2.4, DALi version 1.0.0
Parameters:
[in]handleA reference to the copied handle

Member Function Documentation

void Dali::Stage::Add ( Actor &  actor)

Adds a child Actor to the Stage.

The child will be referenced.

Since:
2.4, DALi version 1.0.0
Parameters:
[in]actorThe child
Precondition:
The actor has been initialized.
The actor does not have a parent.
ContextStatusSignal& Dali::Stage::ContextLostSignal ( )

This signal is emitted when the GL context is lost (Platform specific behaviour).

If the application is responsible for handling context loss, it should listen to this signal and tear down UI components when received.

Since:
2.4, DALi version 1.0.0
Returns:
The context lost signal to connect to
ContextStatusSignal& Dali::Stage::ContextRegainedSignal ( )

This signal is emitted when the GL context is regained (Platform specific behavior).

If the application is responsible for handling context loss, it should listen to this signal and rebuild UI components on receipt.

Since:
2.4, DALi version 1.0.0
Returns:
The context regained signal to connect to
EventProcessingFinishedSignalType& Dali::Stage::EventProcessingFinishedSignal ( )

This signal is emitted just after the event processing is finished.

Since:
2.4, DALi version 1.0.0
Returns:
The signal to connect to
Vector4 Dali::Stage::GetBackgroundColor ( ) const

Retrieves the background color of the stage.

Since:
2.4, DALi version 1.0.0
Returns:
The background color
static Stage Dali::Stage::GetCurrent ( ) [static]

Gets the current Stage.

Since:
2.4, DALi version 1.0.0
Returns:
The current stage or an empty handle if the internal core has not been created or has been already destroyed
Vector2 Dali::Stage::GetDpi ( ) const

Retrieves the DPI of the display device to which the stage is connected.

Since:
2.4, DALi version 1.0.0
Returns:
The horizontal and vertical DPI
Layer Dali::Stage::GetLayer ( uint32_t  depth) const

Retrieves the layer at a specified depth.

Since:
2.4, DALi version 1.0.0
Parameters:
[in]depthThe depth
Returns:
The layer found at the given depth
Precondition:
Depth is less than layer count; see GetLayerCount().
uint32_t Dali::Stage::GetLayerCount ( ) const

Queries the number of on-stage layers.

Note that a default layer is always provided (count >= 1).

Since:
2.4, DALi version 1.0.0
Returns:
The number of layers
ObjectRegistry Dali::Stage::GetObjectRegistry ( ) const

Gets the Object registry.

Since:
2.4, DALi version 1.0.0
Returns:
The object registry
RenderTaskList Dali::Stage::GetRenderTaskList ( ) const

Retrieves the list of render-tasks.

Since:
2.4, DALi version 1.0.0
Returns:
A valid handle to a RenderTaskList
Layer Dali::Stage::GetRootLayer ( ) const

Returns the Stage's Root Layer.

Since:
2.4, DALi version 1.0.0
Returns:
The root layer
Vector2 Dali::Stage::GetSize ( ) const

Returns the size of the Stage in pixels as a Vector.

The x component will be the width of the Stage in pixels. The y component will be the height of the Stage in pixels. The z component will be the distance between far and near planes.

Since:
2.4, DALi version 1.0.0
Returns:
The size of the Stage as a Vector
static bool Dali::Stage::IsInstalled ( ) [static]

Queries whether the Stage exists; this should only return false during or after destruction of Dali core.

Since:
2.4, DALi version 1.0.0
Returns:
True when it's safe to call Stage::GetCurrent()
void Dali::Stage::KeepRendering ( float  durationSeconds)

Keep rendering for at least the given amount of time.

By default, Dali will stop rendering when no Actor positions are being set, and when no animations are running etc. This method is useful to force screen refreshes e.g. when updating a NativeImage.

Since:
2.4, DALi version 1.0.0
Parameters:
[in]durationSecondsTime to keep rendering, 0 means render at least one more frame
KeyEventSignalType& Dali::Stage::KeyEventSignal ( )

This signal is emitted when key event is received.

A callback of the following type may be connected: 

   void YourCallbackName(const KeyEvent& event);
Since:
2.4, DALi version 1.0.0
Returns:
The signal to connect to
Stage& Dali::Stage::operator= ( const Stage &  rhs)

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

Since:
2.4, DALi version 1.0.0
Parameters:
[in]rhsA reference to the copied handle
Returns:
A reference to this
void Dali::Stage::Remove ( Actor &  actor)

Removes a child Actor from the Stage.

The child will be unreferenced.

Since:
2.4, DALi version 1.0.0
Parameters:
[in]actorThe child
Precondition:
The actor has been added to the stage.
SceneCreatedSignalType& Dali::Stage::SceneCreatedSignal ( )

This signal is emitted after the initial scene is created.

It will be triggered after the application init signal.

A callback of the following type may be connected: 

   void YourCallbackName();
Since:
2.4, DALi version 1.0.0
Returns:
The signal to connect to
void Dali::Stage::SetBackgroundColor ( Vector4  color)

Sets the background color of the stage.

Since:
2.4, DALi version 1.0.0
Parameters:
[in]colorThe new background color
TouchedSignalType& Dali::Stage::TouchedSignal ( )

This signal is emitted when the screen is touched and when the touch ends (i.e. the down & up touch events only).

Deprecated:
Deprecated since 3.0, DALi version 1.1.37 Use TouchSignal() instead.

If there are multiple touch points, then this will be emitted when the first touch occurs and then when the last finger is lifted. An interrupted event will also be emitted (if it occurs). A callback of the following type may be connected: 

   void YourCallbackName(const TouchEvent& event);
Since:
2.4, DALi version 1.0.0
Returns:
The touch signal to connect to
Note:
Motion events are not emitted.
TouchSignalType& Dali::Stage::TouchSignal ( )

This signal is emitted when the screen is touched and when the touch ends (i.e. the down & up touch events only).

If there are multiple touch points, then this will be emitted when the first touch occurs and then when the last finger is lifted. An interrupted event will also be emitted (if it occurs). A callback of the following type may be connected: 

   void YourCallbackName( TouchData event );
Since:
3.0, DALi version 1.1.37
Returns:
The touch signal to connect to
Note:
Motion events are not emitted.
WheelEventSignalType& Dali::Stage::WheelEventSignal ( )

This signal is emitted when wheel event is received.

A callback of the following type may be connected: 

   void YourCallbackName(const WheelEvent& event);
Since:
2.4, DALi version 1.0.0
Returns:
The signal to connect to