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/**
* Handles parsing, caching, and detecting changes to background (and -pie-background) CSS
* @constructor
* @param {Element} el the target element
*/
PIE.BackgroundStyleInfo = PIE.StyleInfoBase.newStyleInfo( {
cssProperty: PIE.CSS_PREFIX + 'background',
styleProperty: PIE.STYLE_PREFIX + 'Background',
attachIdents: { 'scroll':1, 'fixed':1, 'local':1 },
repeatIdents: { 'repeat-x':1, 'repeat-y':1, 'repeat':1, 'no-repeat':1 },
originAndClipIdents: { 'padding-box':1, 'border-box':1, 'content-box':1 },
positionIdents: { 'top':1, 'right':1, 'bottom':1, 'left':1, 'center':1 },
sizeIdents: { 'contain':1, 'cover':1 },
propertyNames: {
CLIP: 'backgroundClip',
COLOR: 'backgroundColor',
IMAGE: 'backgroundImage',
ORIGIN: 'backgroundOrigin',
POSITION: 'backgroundPosition',
REPEAT: 'backgroundRepeat',
SIZE: 'backgroundSize'
},
/**
* For background styles, we support the -pie-background property but fall back to the standard
* backround* properties. The reason we have to use the prefixed version is that IE natively
* parses the standard properties and if it sees something it doesn't know how to parse, for example
* multiple values or gradient definitions, it will throw that away and not make it available through
* currentStyle.
*
* Format of return object:
* {
* color: <PIE.Color>,
* bgImages: [
* {
* imgType: 'image',
* imgUrl: 'image.png',
* imgRepeat: <'no-repeat' | 'repeat-x' | 'repeat-y' | 'repeat'>,
* bgPosition: <PIE.BgPosition>,
* bgAttachment: <'scroll' | 'fixed' | 'local'>,
* bgOrigin: <'border-box' | 'padding-box' | 'content-box'>,
* bgClip: <'border-box' | 'padding-box'>,
* bgSize: <PIE.BgSize>,
* origString: 'url(img.png) no-repeat top left'
* },
* {
* imgType: 'linear-gradient',
* gradientStart: <PIE.BgPosition>,
* angle: <PIE.Angle>,
* stops: [
* { color: <PIE.Color>, offset: <PIE.Length> },
* { color: <PIE.Color>, offset: <PIE.Length> }, ...
* ]
* }
* ]
* }
* @param {String} css
* @override
*/
parseCss: function( css ) {
var el = this.targetElement,
cs = el.currentStyle,
tokenizer, token, image,
tok_type = PIE.Tokenizer.Type,
type_operator = tok_type.OPERATOR,
type_ident = tok_type.IDENT,
type_color = tok_type.COLOR,
tokType, tokVal,
beginCharIndex = 0,
positionIdents = this.positionIdents,
gradient, stop, width, height,
props = { bgImages: [] };
function isBgPosToken( token ) {
return token && token.isLengthOrPercent() || ( token.tokenType & type_ident && token.tokenValue in positionIdents );
}
function sizeToken( token ) {
return token && ( ( token.isLengthOrPercent() && PIE.getLength( token.tokenValue ) ) || ( token.tokenValue === 'auto' && 'auto' ) );
}
// If the CSS3-specific -pie-background property is present, parse it
if( this.getCss3() ) {
tokenizer = new PIE.Tokenizer( css );
image = {};
while( token = tokenizer.next() ) {
tokType = token.tokenType;
tokVal = token.tokenValue;
if( !image.imgType && tokType & tok_type.FUNCTION && tokVal === 'linear-gradient' ) {
gradient = { stops: [], imgType: tokVal };
stop = {};
while( token = tokenizer.next() ) {
tokType = token.tokenType;
tokVal = token.tokenValue;
// If we reached the end of the function and had at least 2 stops, flush the info
if( tokType & tok_type.CHARACTER && tokVal === ')' ) {
if( stop.color ) {
gradient.stops.push( stop );
}
if( gradient.stops.length > 1 ) {
PIE.Util.merge( image, gradient );
}
break;
}
// Color stop - must start with color
if( tokType & type_color ) {
// if we already have an angle/position, make sure that the previous token was a comma
if( gradient.angle || gradient.gradientStart ) {
token = tokenizer.prev();
if( token.tokenType !== type_operator ) {
break; //fail
}
tokenizer.next();
}
stop = {
color: PIE.getColor( tokVal )
};
// check for offset following color
token = tokenizer.next();
if( token.isLengthOrPercent() ) {
stop.offset = PIE.getLength( token.tokenValue );
} else {
tokenizer.prev();
}
}
// Angle - can only appear in first spot
else if( tokType & tok_type.ANGLE && !gradient.angle && !stop.color && !gradient.stops.length ) {
gradient.angle = new PIE.Angle( token.tokenValue );
}
else if( isBgPosToken( token ) && !gradient.gradientStart && !stop.color && !gradient.stops.length ) {
tokenizer.prev();
gradient.gradientStart = new PIE.BgPosition(
tokenizer.until( function( t ) {
return !isBgPosToken( t );
}, false )
);
}
else if( tokType & type_operator && tokVal === ',' ) {
if( stop.color ) {
gradient.stops.push( stop );
stop = {};
}
}
else {
// Found something we didn't recognize; fail without adding image
break;
}
}
}
else if( !image.imgType && tokType & tok_type.URL ) {
image.imgUrl = tokVal;
image.imgType = 'image';
}
else if( isBgPosToken( token ) && !image.bgPosition ) {
tokenizer.prev();
image.bgPosition = new PIE.BgPosition(
tokenizer.until( function( t ) {
return !isBgPosToken( t );
}, false )
);
}
else if( tokType & type_ident ) {
if( tokVal in this.repeatIdents && !image.imgRepeat ) {
image.imgRepeat = tokVal;
}
else if( tokVal in this.originAndClipIdents && !image.bgOrigin ) {
image.bgOrigin = tokVal;
if( ( token = tokenizer.next() ) && ( token.tokenType & type_ident ) &&
token.tokenValue in this.originAndClipIdents ) {
image.bgClip = token.tokenValue;
} else {
image.bgClip = tokVal;
tokenizer.prev();
}
}
else if( tokVal in this.attachIdents && !image.bgAttachment ) {
image.bgAttachment = tokVal;
}
else {
return null;
}
}
else if( tokType & type_color && !props.color ) {
props.color = PIE.getColor( tokVal );
}
else if( tokType & type_operator && tokVal === '/' && !image.bgSize && image.bgPosition ) {
// background size
token = tokenizer.next();
if( token.tokenType & type_ident && token.tokenValue in this.sizeIdents ) {
image.bgSize = new PIE.BgSize( token.tokenValue );
}
else if( width = sizeToken( token ) ) {
height = sizeToken( tokenizer.next() );
if ( !height ) {
height = width;
tokenizer.prev();
}
image.bgSize = new PIE.BgSize( width, height );
}
else {
return null;
}
}
// new layer
else if( tokType & type_operator && tokVal === ',' && image.imgType ) {
image.origString = css.substring( beginCharIndex, tokenizer.ch - 1 );
beginCharIndex = tokenizer.ch;
props.bgImages.push( image );
image = {};
}
else {
// Found something unrecognized; chuck everything
return null;
}
}
// leftovers
if( image.imgType ) {
image.origString = css.substring( beginCharIndex );
props.bgImages.push( image );
}
}
// Otherwise, use the standard background properties; let IE give us the values rather than parsing them
else {
this.withActualBg( PIE.ieDocMode < 9 ?
function() {
var propNames = this.propertyNames,
posX = cs[propNames.POSITION + 'X'],
posY = cs[propNames.POSITION + 'Y'],
img = cs[propNames.IMAGE],
color = cs[propNames.COLOR];
if( color !== 'transparent' ) {
props.color = PIE.getColor( color )
}
if( img !== 'none' ) {
props.bgImages = [ {
imgType: 'image',
imgUrl: new PIE.Tokenizer( img ).next().tokenValue,
imgRepeat: cs[propNames.REPEAT],
bgPosition: new PIE.BgPosition( new PIE.Tokenizer( posX + ' ' + posY ).all() )
} ];
}
} :
function() {
var propNames = this.propertyNames,
splitter = /\s*,\s*/,
images = cs[propNames.IMAGE].split( splitter ),
color = cs[propNames.COLOR],
repeats, positions, origins, clips, sizes, i, len, image, sizeParts;
if( color !== 'transparent' ) {
props.color = PIE.getColor( color )
}
len = images.length;
if( len && images[0] !== 'none' ) {
repeats = cs[propNames.REPEAT].split( splitter );
positions = cs[propNames.POSITION].split( splitter );
origins = cs[propNames.ORIGIN].split( splitter );
clips = cs[propNames.CLIP].split( splitter );
sizes = cs[propNames.SIZE].split( splitter );
props.bgImages = [];
for( i = 0; i < len; i++ ) {
image = images[ i ];
if( image && image !== 'none' ) {
sizeParts = sizes[i].split( ' ' );
props.bgImages.push( {
origString: image + ' ' + repeats[ i ] + ' ' + positions[ i ] + ' / ' + sizes[ i ] + ' ' +
origins[ i ] + ' ' + clips[ i ],
imgType: 'image',
imgUrl: new PIE.Tokenizer( image ).next().tokenValue,
imgRepeat: repeats[ i ],
bgPosition: new PIE.BgPosition( new PIE.Tokenizer( positions[ i ] ).all() ),
bgOrigin: origins[ i ],
bgClip: clips[ i ],
bgSize: new PIE.BgSize( sizeParts[ 0 ], sizeParts[ 1 ] )
} );
}
}
}
}
);
}
return ( props.color || props.bgImages[0] ) ? props : null;
},
/**
* Execute a function with the actual background styles (not overridden with runtimeStyle
* properties set by the renderers) available via currentStyle.
* @param fn
*/
withActualBg: function( fn ) {
var isIE9 = PIE.ieDocMode > 8,
propNames = this.propertyNames,
rs = this.targetElement.runtimeStyle,
rsImage = rs[propNames.IMAGE],
rsColor = rs[propNames.COLOR],
rsRepeat = rs[propNames.REPEAT],
rsClip, rsOrigin, rsSize, rsPosition, ret;
if( rsImage ) rs[propNames.IMAGE] = '';
if( rsColor ) rs[propNames.COLOR] = '';
if( rsRepeat ) rs[propNames.REPEAT] = '';
if( isIE9 ) {
rsClip = rs[propNames.CLIP];
rsOrigin = rs[propNames.ORIGIN];
rsPosition = rs[propNames.POSITION];
rsSize = rs[propNames.SIZE];
if( rsClip ) rs[propNames.CLIP] = '';
if( rsOrigin ) rs[propNames.ORIGIN] = '';
if( rsPosition ) rs[propNames.POSITION] = '';
if( rsSize ) rs[propNames.SIZE] = '';
}
ret = fn.call( this );
if( rsImage ) rs[propNames.IMAGE] = rsImage;
if( rsColor ) rs[propNames.COLOR] = rsColor;
if( rsRepeat ) rs[propNames.REPEAT] = rsRepeat;
if( isIE9 ) {
if( rsClip ) rs[propNames.CLIP] = rsClip;
if( rsOrigin ) rs[propNames.ORIGIN] = rsOrigin;
if( rsPosition ) rs[propNames.POSITION] = rsPosition;
if( rsSize ) rs[propNames.SIZE] = rsSize;
}
return ret;
},
getCss: PIE.StyleInfoBase.cacheWhenLocked( function() {
return this.getCss3() ||
this.withActualBg( function() {
var cs = this.targetElement.currentStyle,
propNames = this.propertyNames;
return cs[propNames.COLOR] + ' ' + cs[propNames.IMAGE] + ' ' + cs[propNames.REPEAT] + ' ' +
cs[propNames.POSITION + 'X'] + ' ' + cs[propNames.POSITION + 'Y'];
} );
} ),
getCss3: PIE.StyleInfoBase.cacheWhenLocked( function() {
var el = this.targetElement;
return el.style[ this.styleProperty ] || el.currentStyle.getAttribute( this.cssProperty );
} ),
/**
* Tests if style.PiePngFix or the -pie-png-fix property is set to true in IE6.
*/
isPngFix: function() {
var val = 0, el;
if( PIE.ieVersion < 7 ) {
el = this.targetElement;
val = ( '' + ( el.style[ PIE.STYLE_PREFIX + 'PngFix' ] || el.currentStyle.getAttribute( PIE.CSS_PREFIX + 'png-fix' ) ) === 'true' );
}
return val;
},
/**
* The isActive logic is slightly different, because getProps() always returns an object
* even if it is just falling back to the native background properties. But we only want
* to report is as being "active" if either the -pie-background override property is present
* and parses successfully or '-pie-png-fix' is set to true in IE6.
*/
isActive: PIE.StyleInfoBase.cacheWhenLocked( function() {
return (this.getCss3() || this.isPngFix()) && !!this.getProps();
} )
} );
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