#include <CULayout.h>

Inheritance diagram for cugl::scene2::Layout:

Public Types
enum class	Anchor : int { BOTTOM_LEFT = 0 , MIDDLE_LEFT = 1 , TOP_LEFT = 2 , BOTTOM_CENTER = 3 , CENTER = 4 , TOP_CENTER = 5 , BOTTOM_RIGHT = 6 , MIDDLE_RIGHT = 7 , TOP_RIGHT = 8 , BOTTOM_FILL = 9 , MIDDLE_FILL = 10 , TOP_FILL = 11 , LEFT_FILL = 12 , CENTER_FILL = 13 , RIGHT_FILL = 14 , TOTAL_FILL = 15 , NONE = 16 }

Public Member Functions
	Layout ()

	~Layout ()

virtual void	dispose ()

virtual bool	init ()

virtual bool	initWithData (const std::shared_ptr< JsonValue > &data)

virtual bool	add (const std::string key, const std::shared_ptr< JsonValue > &data)

virtual bool	remove (const std::string key)

virtual void	layout (SceneNode *node)

Static Public Member Functions
static Anchor	getAnchor (const std::string x_anchor, const std::string y_anchor)

static void	placeNode (SceneNode *node, Anchor anchor, const Rect bounds, const Vec2 offset)

static void	reanchor (SceneNode *node, Anchor anchor)

Detailed Description

This class is an abstract interface for a layout manager.

A layout manager associates layout information with scene graph nodes, much like a map interface. When a layout manager is asked to layout a Node, it searches for those children that are registered with the layout manager. For those children, it repositions and/or resizes them according to the layout information.

Layout information is indexed by key. To look up the layout information of a scene graph node, we use the name of the node. This requires all nodes to have unique names. The Scene2Loader prefixes all child names by the parent name, so this is the case in any well-defined JSON file.

All layout managers extend this class, providing implementations for the add, remove, and layout methods.

Several layout managers, such as AnchoredLayout and GridLayout make use of anchors. Therefore, we provide support for them in this class in order to consolidate code.

Member Enumeration Documentation

◆ Anchor

enum class cugl::scene2::Layout::Anchor : int

strong

This enum represents the nine possible anchors.

The anchor positions are similar to that of a NinePatch. The anchor positions are relative to the Node bounding box. In addition, there are "fill" anchors, which stretch the node to fill the available space.

Enumerator
BOTTOM_LEFT	The bottom left corner, or position (0,0) in Node coordinate space.
MIDDLE_LEFT	The left side, or position (0,height/2) in Node coordinate space.
TOP_LEFT	The top left corner, or position (0,height) in Node coordinate space.
BOTTOM_CENTER	The bottom side, or position (width/2,0) in Node coordinate space.
CENTER	The middle region, or position (width/2,height/2) in Node coordinate space.
TOP_CENTER	The top side, or position (width/2,height) in Node coordinate space.
BOTTOM_RIGHT	The bottom right corner, or position (width,0) in Node coordinate space.
MIDDLE_RIGHT	The right side, or position (width,height/2) in Node coordinate space.
TOP_RIGHT	The top left corner, or position (width,height) in Node coordinate space.
BOTTOM_FILL	Anchors at y=0, but stretches the width to fill the parent.
MIDDLE_FILL	Anchors at y=height/2, but stretches the width to fill the parent.
TOP_FILL	Anchors at y=height, but stretches the width to fill the parent.
LEFT_FILL	Anchors at x=0, but stretches the height to fill the parent.
CENTER_FILL	Anchors at x=width/2, but stretches the height to fill the parent.
RIGHT_FILL	Anchors at x=width, but stretches the height to fill the parent.
TOTAL_FILL	Stretches the width and height to fill the entire parent
NONE	No anchor. The layout will not adjust this child

Constructor & Destructor Documentation

◆ Layout()

cugl::scene2::Layout::Layout ( )

inline

Creates a degenerate layout manager with no data.

NEVER USE A CONSTRUCTOR WITH NEW. If you want to allocate an object on the heap, use one of the static constructors instead.

◆ ~Layout()

cugl::scene2::Layout::~Layout ( )

inline

Deletes this layout manager, disposing of all resources.

Member Function Documentation

◆ add()

virtual bool cugl::scene2::Layout::add	(	const std::string	key,
		const std::shared_ptr< JsonValue > &	data
	)

inlinevirtual

Assigns layout information for a given key.

To look up the layout information of a scene graph node, we use the name of the node. This requires all nodes to have unique names. The Scene2Loader prefixes all child names by the parent name, so this is the case in any well-defined JSON file.

The format of the JSON object is layout manager specific.

If the key is already in use, this method will fail.

Parameters

key	The key identifying the layout information
data	A JSON object with the layout information

Returns: true if the layout information was assigned to that key

Reimplemented in cugl::scene2::AnchoredLayout, cugl::scene2::FloatLayout, and cugl::scene2::GridLayout.

◆ dispose()

virtual void cugl::scene2::Layout::dispose ( )

inlinevirtual

Deletes the layout resources and resets all attributes.

A disposed layout manager can be safely reinitialized.

Reimplemented in cugl::scene2::AnchoredLayout, cugl::scene2::FloatLayout, and cugl::scene2::GridLayout.

◆ getAnchor()

static Anchor cugl::scene2::Layout::getAnchor	(	const std::string	x_anchor,
		const std::string	y_anchor
	)

static

Returns the anchor for the given text values

This method is used to get an anchor object from a JSON directory. The x_anchor should be one of 'left', 'center', 'right', or 'fill'. The y_anchor should be one of 'bottom', 'middle', 'top', or 'fill'.

Parameters

x_anchor	The horizontal anchor setting
y_anchor	The vertical anchor setting

Returns: the anchor for the given text values

◆ init()

virtual bool cugl::scene2::Layout::init ( )

inlinevirtual

Initializes a new layout manager.

The layout manager is initially empty. Before using it to perform a layout, layout information must be registered throught the add method interface.

Returns: true if initialization is successful.

◆ initWithData()

virtual bool cugl::scene2::Layout::initWithData ( const std::shared_ptr< JsonValue > & data )

inlinevirtual

Initializes a new layout manager with the given JSON specificaton.

The JSON specification format is implementation specific. However, all layout managers require a 'type' attribute that specifies the name of the layout manager.

Parameters

data	The JSON object specifying the node

Returns: true if initialization was successful.

Reimplemented in cugl::scene2::AnchoredLayout, cugl::scene2::FloatLayout, and cugl::scene2::GridLayout.

◆ layout()

virtual void cugl::scene2::Layout::layout ( SceneNode * node )

inlinevirtual

Performs a layout on the given node.

This layout manager will searches for those children that are registered with it. For those children, it repositions and/or resizes them according to the layout information.

To look up the layout information of a scene graph node, this method uses the name of the node. This requires all nodes to have unique names. The Scene2Loader prefixes all child names by the parent name, so this is the case in any well-defined JSON file.

Children not registered with this layout manager are not affected.

Parameters

node	The scene graph node to rearrange

Reimplemented in cugl::scene2::AnchoredLayout, cugl::scene2::FloatLayout, and cugl::scene2::GridLayout.

◆ placeNode()

static void cugl::scene2::Layout::placeNode	(	SceneNode *	node,
		Anchor	anchor,
		const Rect	bounds,
		const Vec2	offset
	)

static

Repositions the given node according the rules of its anchor.

The repositioning is done relative to bounds, not the parent node. This allows us to apply anchors to a subregion, like we do in GridLayout. The value offset should be in coordinates, and not percentages.

Parameters

node	The node to reposition
anchor	The anchor rule for this node
bounds	The area to compute the position from
offset	The offset from the computed anchor position

◆ reanchor()

static void cugl::scene2::Layout::reanchor	(	SceneNode *	node,
		Anchor	anchor
	)

static

Resets the node anchor to agree with the layout anchor

For some layout managers, the layout anchor (which is an enum) may disagree with the node anchor (which is a percentage vector). This method allows a layout manager to "disable" the node anchor in favor of the layout anchor.

Parameters

node	The node to reanchor
anchor	The layout anchor to use

◆ remove()

virtual bool cugl::scene2::Layout::remove ( const std::string key )

inlinevirtual

Removes the layout information for a given key.

To look up the layout information of a scene graph node, we use the name of the node. This requires all nodes to have unique names. The Scene2Loader prefixes all child names by the parent name, so this is the case in any well-defined JSON file.

If the key is not in use, this method will fail.

Parameters

key	The key identifying the layout information

Returns: true if the layout information was removed for that key

Reimplemented in cugl::scene2::AnchoredLayout, cugl::scene2::FloatLayout, and cugl::scene2::GridLayout.

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

cugl/include/cugl/scene2/layout/CULayout.h

Public Types

Public Member Functions

Static Public Member Functions

Detailed Description

Member Enumeration Documentation

◆ Anchor

Constructor & Destructor Documentation

◆ Layout()

◆ ~Layout()

Member Function Documentation

◆ add()

◆ dispose()

◆ getAnchor()

◆ init()

◆ initWithData()

◆ layout()

◆ placeNode()

◆ reanchor()

◆ remove()