Nine-Patch Texture View. More...

#include <LNinePatchView.h>

Inheritance diagram for LNinePatchView:

Public Member Functions
	LNinePatchView (LView *parent=nullptr) noexcept
	Creates an empty nine-patch view.

	LNinePatchView (LTexture texture, Float32 bufferScale, const LRectF &center, LView parent=nullptr) noexcept
	Creates a nine-patch view with a specified texture.

	~LNinePatchView () noexcept
	Destructor for LNinePatchView.

void	setPos (Int32 x, Int32 y) noexcept
	Sets the position of the view.

void	setPos (const LPoint &pos) noexcept
	Sets the position of the view.

void	setSize (Int32 width, Int32 height) noexcept
	Sets the size of the view.

void	setSize (const LSize &size) noexcept
	Sets the size of the view.

const LSize &	minSize () const noexcept
	Returns the minimum size of the view.

LTexture *	texture () const noexcept
	Returns the current nine-patch texture.

void	setTexture (LTexture *texture, Float32 bufferScale, const LRectF &center) noexcept
	Sets the nine-patch texture.

const LRectF &	center () const noexcept
	Returns the texture subrect for the central view in surface coordinates.

LTextureView *	getSubView (LBitset< LEdge > edge) noexcept
	Retrieves one of the nine sub texture views.

std::array< LTextureView, 9 > &	subViews () noexcept
	Array of the 9 sub-views.

bool	nativeMapped () const noexcept override
	Tells whether the view should be rendered.

const LPoint &	nativePos () const noexcept override
	Gets the position of the view without any transformations applied.

const LSize &	nativeSize () const noexcept override
	Gets the size of the view without any transformations applied.

Float32	bufferScale () const noexcept override
	Gets the scale of the view buffer content.

void	enteredOutput (LOutput *output) noexcept override
	Notifies that portion of the view is visible on the given output.

void	leftOutput (LOutput *output) noexcept override
	Notifies that the view is no longer visible on the given output.

const std::vector< LOutput * > &	outputs () const noexcept override
	Gets a vector of output pointers on which the view is currently visible.

void	requestNextFrame (LOutput *output) noexcept override
	Notifies that the view has been rendered on the given output.

const LRegion *	damage () const noexcept override
	Gets the region within the view rect that needs to be repainted.

const LRegion *	translucentRegion () const noexcept override
	Gets the current translucent region.

const LRegion *	opaqueRegion () const noexcept override
	Gets the current opaque region.

const LRegion *	inputRegion () const noexcept override
	Gets the current input region.

void	paintEvent (const PaintEventParams &params) noexcept override
	Requests to paint a region of the view to the current framebuffer.

Public Member Functions inherited from LView
	LView (UInt32 type, bool renderable, LView *parent) noexcept
	Construct an LView object.

	~LView () noexcept
	Destructor for the LView class.

void	enablePointerEvents (bool enabled) noexcept
	Toggles pointer events.

bool	pointerEventsEnabled () const noexcept
	Checks if pointer events are enabled.

bool	pointerIsOver () const noexcept
	Checks if the view has pointer focus.

void	enableBlockPointer (bool enabled) noexcept
	Toggles blocking pointer events to views behind the view's input region.

bool	blockPointerEnabled () const noexcept
	Checks if blocking of pointer events is enabled.

void	enableKeyboardEvents (bool enabled) noexcept
	Toggles keyboard events.

bool	keyboardEventsEnabled () const noexcept
	Checks if keyboard events are enabled.

void	enableTouchEvents (bool enabled) noexcept
	Toggles touch events.

bool	touchEventsEnabled () const noexcept
	Checks if touch events are enabled.

void	enableBlockTouch (bool enabled) noexcept
	Toggles blocking touch events to views behind the view's input region.

bool	blockTouchEnabled () const noexcept
	Checks if blocking of touch events to views behind the view's input region is enabled.

void	damageAll () noexcept
	Forces a complete repaint of the view in the next rendering frame.

LScene *	scene () const noexcept
	Gets the scene in which this view is currently embedded.

bool	isLScene () const noexcept
	Checks if the view is an LScene::mainView().

LSceneView *	parentSceneView () const noexcept
	Gets the closest parent LSceneView.

UInt32	type () const noexcept
	Gets the identifier for the type of view.

bool	isRenderable () const noexcept
	Checks if the view is renderable.

void	repaint () const noexcept
	Schedules a repaint for all outputs where this view is currently visible.

LView *	parent () const noexcept
	Gets the parent of the view.

void	setParent (LView *view) noexcept
	Sets the new parent for the view and insert it at the end of its children list.

void	insertAfter (LView *prev) noexcept
	Inserts the view after the specified 'prev' view.

const std::list< LView * > &	children () const noexcept
	Children views.

void	enableParentOffset (bool enabled) noexcept
	Toggles the parent position offset.

bool	parentOffsetEnabled () const noexcept
	Checks if pos() includes the parent's position.

const LPoint &	pos () const noexcept
	Gets the current position of the view with applied transformations.

const LSize &	size () const noexcept
	Gets the current size of the view with applied transformations.

void	enableClipping (bool enabled) noexcept
	Toggles the use of the clippingRect() property.

bool	clippingEnabled () const noexcept
	Checks if the view is currently being clipped to the clippingRect() property.

void	setClippingRect (const LRect &rect) noexcept
	Sets a custom clipping rect.

const LRect &	clippingRect () const noexcept
	Gets the clipping rect set with setClippingRect().

void	enableParentClipping (bool enabled) noexcept
	Toggles parent clipping.

bool	parentClippingEnabled () const noexcept
	Checks if the view is clipped to the parent view rect.

void	enableScaling (bool enabled) noexcept
	Toggles the use of the scalingVector().

bool	scalingEnabled () const noexcept
	Checks if the scalingVector() is enabled.

void	setScalingVector (const LSizeF &scalingVector) noexcept
	Sets the scalingVector() property.

const LSizeF &	scalingVector (bool forceIgnoreParent=false) const noexcept
	Gets the scaling vector.

void	enableParentScaling (bool enabled) noexcept
	Toggles the scaling of size and position by the parent's scaling vector.

bool	parentScalingEnabled () const noexcept
	Checks if the size and position are scaled by the parent's scalingVector().

void	setVisible (bool visible) noexcept
	Toggles the view visibility.

bool	visible () const noexcept
	Checks if the view is marked as visible.

bool	mapped () const noexcept
	Checks if the view should be rendered, taking into consideration several conditions.

void	setOpacity (Float32 opacity) noexcept
	Set the view opacity.

Float32	opacity (bool forceIgnoreParent=false) const noexcept
	Gets the view opacity.

void	enableParentOpacity (bool enabled) noexcept
	Toggles the use of the parent's opacity.

bool	parentOpacityEnabled () const noexcept
	Checks if the view's opacity is multiplied by its parent's opacity.

void	enableForceRequestNextFrame (bool enabled) noexcept
	Toggles forcing triggering the requestNextFrame() event.

bool	forceRequestNextFrameEnabled () const noexcept
	Checks if forcing requestNextFrame() is enabled.

void	setBlendFunc (const LBlendFunc &blendFunc) noexcept
	Sets a custom alpha/color blending function for the view.

const LBlendFunc &	blendFunc () const noexcept
	Gets the blending function set with setBlendFunc().

void	enableAutoBlendFunc (bool enabled) noexcept
	Toggles the automatic blend function adjustment.

bool	autoBlendFuncEnabled () const noexcept
	Checks whether the automatic blend function adjustment is enabled.

void	setColorFactor (const LRGBAF &colorFactor) noexcept
	Set the color factor.

const LRGBAF &	colorFactor () const noexcept
	Gets the color factor.

LBox	boundingBox () const noexcept
	Gets the bounding box of the view and all its mapped children.

virtual void	pointerEnterEvent (const LPointerEnterEvent &event)
	Handles a pointer enter event within the view.

virtual void	pointerMoveEvent (const LPointerMoveEvent &event)
	Handle a pointer move event within the view.

virtual void	pointerLeaveEvent (const LPointerLeaveEvent &event)
	Handle a pointer leave event within the view.

virtual void	pointerButtonEvent (const LPointerButtonEvent &event)
	Handle a pointer button event within the view.

virtual void	pointerScrollEvent (const LPointerScrollEvent &event)
	Handle a pointer scroll event within the view.

virtual void	pointerSwipeBeginEvent (const LPointerSwipeBeginEvent &event)
	Handle a pointer swipe begin event within the view.

virtual void	pointerSwipeUpdateEvent (const LPointerSwipeUpdateEvent &event)
	Handle a pointer swipe update event within the view.

virtual void	pointerSwipeEndEvent (const LPointerSwipeEndEvent &event)
	Handle a pointer swipe end event within the view.

virtual void	pointerPinchBeginEvent (const LPointerPinchBeginEvent &event)
	Handle a pointer pinch begin event within the view.

virtual void	pointerPinchUpdateEvent (const LPointerPinchUpdateEvent &event)
	Handle a pointer pinch update event within the view.

virtual void	pointerPinchEndEvent (const LPointerPinchEndEvent &event)
	Handle a pointer pinch end event within the view.

virtual void	pointerHoldBeginEvent (const LPointerHoldBeginEvent &event)
	Handle a pointer hold begin event within the view.

virtual void	pointerHoldEndEvent (const LPointerHoldEndEvent &event)
	Handle a pointer hold end event within the view.

virtual void	keyEvent (const LKeyboardKeyEvent &event)
	Handle the key event within the view.

virtual void	touchDownEvent (const LTouchDownEvent &event)
	Handle a touch down event within the view.

virtual void	touchMoveEvent (const LTouchMoveEvent &event)
	Handle a touch move event within the view.

virtual void	touchUpEvent (const LTouchUpEvent &event)
	Handle a touch up event within the view.

virtual void	touchFrameEvent (const LTouchFrameEvent &event)
	Handle a touch frame event within the view.

virtual void	touchCancelEvent (const LTouchCancelEvent &event)
	Handle a touch cancel event within the view.

Public Member Functions inherited from LObject
	LObject (const LObject &) noexcept
	Copy constructor.

LObject &	operator= (const LObject &) noexcept
	Assignment operator (each object has its own individual LWeak reference count).

void	setUserData (UIntPtr data) const noexcept
	Store an unsigned integer value/pointer.

UIntPtr	userData () const noexcept
	Retrieves the stored unsigned integer value/pointer.

Additional Inherited Members
Public Types inherited from LView
enum	Type : UInt8
	Types of views included with Louvre. More...

Protected Member Functions inherited from LObject
	LObject () noexcept=default
	Constructor of the LObject class.

virtual	~LObject () noexcept
	Destructor of the LObject class.

void	notifyDestruction () noexcept
	Notifies the object destruction.

Detailed Description

Nine-Patch Texture View.

The LNinePatchView class is useful for implementing buttons, containers, borders, etc. in an efficient way. It consists of 9 sub LTextureView s arranged as shown below:

The portion of the texture, position and size of each subview is automatically calculated from the provided center() (E) and the dimensions set with setSize().

For more information about the nine-patch technique, check out this link.

Subviews can be accessed directly via subViews() or getSubView(), for example, to toggle the visibility of a specific one, change its color, etc.

Warning: If used as borders (with an invisible center), remember to hide the central view, otherwise, the scene will unnecessarily paint invisible pixels.

Constructor & Destructor Documentation

◆ LNinePatchView() [1/2]

LNinePatchView ( LView * parent = nullptr )

inlinenoexcept

Creates an empty nine-patch view.

◆ LNinePatchView() [2/2]

LNinePatchView	(	LTexture *	texture,
		Float32	bufferScale,
		const LRectF &	center,
		LView *	parent = `nullptr`
	)

inlinenoexcept

Creates a nine-patch view with a specified texture.

Parameters

texture	The texture, or `nullptr` (unmapped).
bufferScale	The scaling factor of the texture.
center	The subrect of the texture corresponding to the central view in surface coordinates. If extended beyond the texture bounds, it will be clipped.
parent	The parent view, or `nullptr` if there is no parent. Defaults to `nullptr`.

◆ ~LNinePatchView()

~LNinePatchView ( )

inlinenoexcept

Destructor for LNinePatchView.

Member Function Documentation

◆ setPos() [1/2]

void setPos	(	Int32	x,
		Int32	y
	)

noexcept

Sets the position of the view.

Parameters

x	The x-coordinate in surface coordinates.
y	The y-coordinate in surface coordinates.

◆ setPos() [2/2]

void setPos ( const LPoint & pos )

inlinenoexcept

Sets the position of the view.

Parameters

pos	The position in surface coordinates.

◆ setSize() [1/2]

void setSize	(	Int32	width,
		Int32	height
	)

noexcept

Sets the size of the view.

Note: The size is constrained by minSize()

Parameters

width	The width in surface coordinates.
height	The height in surface coordinates.

◆ setSize() [2/2]

void setSize ( const LSize & size )

inlinenoexcept

Sets the size of the view.

Note: The size is constrained by minSize()

Parameters

size	The size in surface coordinates.

◆ minSize()

const LSize & minSize ( ) const

inlinenoexcept

Returns the minimum size of the view.

The minimum size is equal to the texture's size in surface coordinates (the buffer size divided by the buffer scale) minus the center rect size.

If no texture is set the minimum size is (0, 0).

◆ texture()

LTexture * texture ( ) const

inlinenoexcept

Returns the current nine-patch texture.

See also: setTexture()

Returns: A pointer to the texture, or nullptr if no texture is set.

◆ setTexture()

void setTexture	(	LTexture *	texture,
		Float32	bufferScale,
		const LRectF &	center
	)

noexcept

Sets the nine-patch texture.

Parameters

texture	The texture, or `nullptr` to unset.
bufferScale	The scaling factor of the texture.
center	The subrect of the texture corresponding to the central view in surface coordinates. If extended beyond the texture bounds, it will be clipped.

◆ center()

const LRectF & center ( ) const

inlinenoexcept

Returns the texture subrect for the central view in surface coordinates.

See also: setTexture()

If no texture is set (0, 0, 0, 0) is returned.

◆ getSubView()

LTextureView * getSubView ( LBitset< LEdge > edge )

noexcept

Retrieves one of the nine sub texture views.

Example:

ninePatchView->getSubView(LEdgeTop | LEdgeLeft) // Returns the top-left sub-view

Louvre::LEdgeLeft

@ LEdgeLeft

The left edge.

Definition LEdge.h:17

Louvre::LEdgeTop

@ LEdgeTop

The top edge.

Definition LEdge.h:15

Parameters

edge	The edge or corner to retrieve. Passing LEdgeNone (or a value that is not a corner or edge) returns the central view.

Returns: A pointer to the requested LTextureView.

◆ subViews()

std::array< LTextureView, 9 > & subViews ( )

inlinenoexcept

Array of the 9 sub-views.

The order of the views is L, T, R, B, TL, TR, BR, BL, and Center.

If a specific view needs to be retrieved, consider using getSubView() instead.

Returns: A reference to the vector of sub-views.

◆ nativeMapped()

bool nativeMapped ( ) const

overridevirtualnoexcept

Tells whether the view should be rendered.

Returns: true if the view should be rendered without considering visible(), otherwise false.

Implements LView.

◆ nativePos()

const LPoint & nativePos ( ) const

overridevirtualnoexcept

Gets the position of the view without any transformations applied.

Must return the position of the view in compositor-global coordinates.

Returns: The position of the view as an LPoint object.

Implements LView.

◆ nativeSize()

const LSize & nativeSize ( ) const

overridevirtualnoexcept

Gets the size of the view without any transformations applied.

Must return the size of the view in surface coordinates.

Returns: The size of the view as an LSize object.

Implements LView.

◆ bufferScale()

Float32 bufferScale ( ) const

overridevirtualnoexcept

Gets the scale of the view buffer content.

This property is primarily used by views that contain a buffer like for example the LSceneView, LSurfaceView and LTextureView types.

Returns: The buffer scale as an Int32 value.

Implements LView.

◆ enteredOutput()

void enteredOutput ( LOutput * output )

overridevirtualnoexcept

Notifies that portion of the view is visible on the given output.

This method is invoked by a LScene when the view's rect intersects an output.

Parameters

output The LOutput where the view is visible.

Implements LView.

◆ leftOutput()

void leftOutput ( LOutput * output )

overridevirtualnoexcept

Notifies that the view is no longer visible on the given output.

This method is invoked by a LScene when the view's rect no longer intersects an output.

Parameters

output The LOutput from which the view is no longer visible.

Implements LView.

◆ outputs()

const std::vector< LOutput * > & outputs ( ) const

overridevirtualnoexcept

Gets a vector of output pointers on which the view is currently visible.

Must return a vector of output pointers where the view is currently visible.
Use the enteredOutput() and leftOutput() methods to update the vector.

Returns: A reference to a vector of LOutput pointers representing the outputs where the view is visible.

Implements LView.

◆ requestNextFrame()

void requestNextFrame ( LOutput * output )

overridevirtualnoexcept

Notifies that the view has been rendered on the given output.

This method is called by the closest parent scene view and should be used to clear the previous view damage or update its content.
If forceRequestNextFrameEnabled() is true, this method is always called.

Parameters

output The LOutput on which the view is rendered.

Implements LView.

◆ damage()

const LRegion * damage ( ) const

overridevirtualnoexcept

Gets the region within the view rect that needs to be repainted.

The region rects are specified in surface coordinates within the view, without any scaling, clipping, or offset transformations applied.

It should be cleared after requestNextFrame() is called.

If nullptr is returned, the entire view rect will be considered damaged.

If the view has no damage, simply pass an empty LRegion (not nullptr).

Returns: A pointer to the LRegion specifying the damaged area within the view, or nullptr if the entire view rect is damaged.

Implements LView.

◆ translucentRegion()

const LRegion * translucentRegion ( ) const

overridevirtualnoexcept

Gets the current translucent region.

The region must be specified in surface-local coordinates, without any scaling, clipping, or offset transformations applied.

If nullptr is returned, the entire view rect will be considered translucent.

Implements LView.

◆ opaqueRegion()

const LRegion * opaqueRegion ( ) const

overridevirtualnoexcept

Gets the current opaque region.

The region must be specified in surface-local coordinates without any scaling, clipping, or offset transformations applied.

If nullptr is returned, the inverse of the translucent region will be considered opaque.

Note: You could only specify the translucent region.

Implements LView.

◆ inputRegion()

const LRegion * inputRegion ( ) const

overridevirtualnoexcept

Gets the current input region.

Region within the view rect that can receive pointer and touch events.

The region must be specified in surface-local coordinates without any scaling, clipping, or offset transformations applied.

If nullptr is returned, the entire view will receive input.

Implements LView.

◆ paintEvent()

void paintEvent ( const PaintEventParams & params )

overridevirtualnoexcept

Requests to paint a region of the view to the current framebuffer.

This method is used by the closest parent LSceneView to request the view to paint a specified region on the current framebuffer. Painting can be performed using the provided LPainter object.

Note: Using LPainter is optional.

Implements LView.

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ LNinePatchView() [1/2]

◆ LNinePatchView() [2/2]

◆ ~LNinePatchView()

Member Function Documentation

◆ setPos() [1/2]

◆ setPos() [2/2]

◆ setSize() [1/2]

◆ setSize() [2/2]

◆ minSize()

◆ texture()

◆ setTexture()

◆ center()

◆ getSubView()

◆ subViews()

◆ nativeMapped()

◆ nativePos()

◆ nativeSize()

◆ bufferScale()

◆ enteredOutput()

◆ leftOutput()

◆ outputs()

◆ requestNextFrame()

◆ damage()

◆ translucentRegion()

◆ opaqueRegion()

◆ inputRegion()

◆ paintEvent()