MobileFrontend\Transforms\LazyImageTransform Class Reference

Inheritance diagram for MobileFrontend\Transforms\LazyImageTransform:

Collaboration diagram for MobileFrontend\Transforms\LazyImageTransform:

Public Member Functions
	__construct ( $skipSmallImages=false)
	apply (DOMElement $node)
	Insert a table of content placeholder into the element which will be progressively enhanced via JS.
	getImageDimensions (DOMElement $img)
	Determine the user perceived width and height of an image element based on style, width, and height attributes.
	isDimensionSmallerThanThreshold ( $dimension)
	Is image dimension small enough to not lazy load it.

Static Public Member Functions
static	gradeCImageSupport ()
	Fallback for Grade C to load lazy-load image placeholders.

Protected Attributes
	$skipSmall

Constructor & Destructor Documentation

__construct()

MobileFrontend\Transforms\LazyImageTransform::__construct

(

$skipSmallImages = false

)

Parameters

bool

$skipSmallImages

whether small images should be excluded from lazy loading

Member Function Documentation

apply()

MobileFrontend\Transforms\LazyImageTransform::apply

(

DOMElement

$node

)

Insert a table of content placeholder into the element which will be progressively enhanced via JS.

Parameters

DOMElement

$node

to be transformed

Implements MobileFrontend\Transforms\IMobileTransform.

getImageDimensions()

MobileFrontend\Transforms\LazyImageTransform::getImageDimensions

(

DOMElement

$img

)

Determine the user perceived width and height of an image element based on style, width, and height attributes.

As in the browser, the style attribute takes precedence over the width and height attributes. If the image has no style, width or height attributes, then the image is dimensionless.

Parameters

DOMElement

$img

element

Returns

array with width and height parameters if dimensions are found

gradeCImageSupport()

static MobileFrontend\Transforms\LazyImageTransform::gradeCImageSupport ( )

static

Fallback for Grade C to load lazy-load image placeholders.

Note: This will add a single repaint for Grade C browsers as images enter view but this is intentional and deemed acceptable.

Returns

string The JavaScript code to load lazy placeholders in Grade C browsers

isDimensionSmallerThanThreshold()

MobileFrontend\Transforms\LazyImageTransform::isDimensionSmallerThanThreshold

(

$dimension

)

Is image dimension small enough to not lazy load it.

Parameters

string

$dimension

in css format, supports only px|ex units

Returns

bool

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

• includes/Transforms/LazyImageTransform.php