/**
* Add style management functionality to DOM.
* @module dom
* @submodule dom-style
* @for DOM
*/
var DOCUMENT_ELEMENT = 'documentElement',
DEFAULT_VIEW = 'defaultView',
OWNER_DOCUMENT = 'ownerDocument',
STYLE = 'style',
FLOAT = 'float',
CSS_FLOAT = 'cssFloat',
STYLE_FLOAT = 'styleFloat',
TRANSPARENT = 'transparent',
GET_COMPUTED_STYLE = 'getComputedStyle',
GET_BOUNDING_CLIENT_RECT = 'getBoundingClientRect',
DOCUMENT = Y.config.doc,
Y_DOM = Y.DOM,
TRANSFORM,
TRANSFORMORIGIN,
VENDOR_TRANSFORM = [
'WebkitTransform',
'MozTransform',
'OTransform',
'msTransform',
'transform'
],
re_unit = /width|height|top|left|right|bottom|margin|padding/i;
Y.Array.each(VENDOR_TRANSFORM, function(val) {
if (val in DOCUMENT[DOCUMENT_ELEMENT].style) {
TRANSFORM = val;
TRANSFORMORIGIN = val + "Origin";
}
});
Y.mix(Y_DOM, {
DEFAULT_UNIT: 'px',
CUSTOM_STYLES: {
},
/**
* Sets a style property for a given element.
* @method setStyle
* @param {HTMLElement} node The HTMLElement to apply the style to.
* @param {String} att The style property to set.
* @param {String|Number} val The value.
* @param {Object} [style] The style node. Defaults to `node.style`.
*/
setStyle: function(node, att, val, style) {
style = style || node.style;
var CUSTOM_STYLES = Y_DOM.CUSTOM_STYLES;
if (style) {
if (val === null || val === '') { // normalize unsetting
val = '';
} else if (!isNaN(Number(val)) && re_unit.test(att)) { // number values may need a unit
val += Y_DOM.DEFAULT_UNIT;
}
if (att in CUSTOM_STYLES) {
if (CUSTOM_STYLES[att].set) {
CUSTOM_STYLES[att].set(node, val, style);
return; // NOTE: return
} else if (typeof CUSTOM_STYLES[att] === 'string') {
att = CUSTOM_STYLES[att];
}
} else if (att === '') { // unset inline styles
att = 'cssText';
val = '';
}
style[att] = val;
}
},
/**
* Returns the current style value for the given property.
* @method getStyle
* @param {HTMLElement} node The HTMLElement to get the style from.
* @param {String} att The style property to get.
* @param {Object} [style] The style node. Defaults to `node.style`.
*/
getStyle: function(node, att, style) {
style = style || node.style;
var CUSTOM_STYLES = Y_DOM.CUSTOM_STYLES,
val = '';
if (style) {
if (att in CUSTOM_STYLES) {
if (CUSTOM_STYLES[att].get) {
return CUSTOM_STYLES[att].get(node, att, style); // NOTE: return
} else if (typeof CUSTOM_STYLES[att] === 'string') {
att = CUSTOM_STYLES[att];
}
}
val = style[att];
if (val === '') { // TODO: is empty string sufficient?
val = Y_DOM[GET_COMPUTED_STYLE](node, att);
}
}
return val;
},
/**
* Sets multiple style properties.
* @method setStyles
* @param {HTMLElement} node The HTMLElement to apply the styles to.
* @param {Object} hash An object literal of property:value pairs.
*/
setStyles: function(node, hash) {
var style = node.style;
Y.each(hash, function(v, n) {
Y_DOM.setStyle(node, n, v, style);
}, Y_DOM);
},
/**
* Returns the computed style for the given node.
* @method getComputedStyle
* @param {HTMLElement} node The HTMLElement to get the style from.
* @param {String} att The style property to get.
* @return {String} The computed value of the style property.
*/
getComputedStyle: function(node, att) {
var val = '',
doc = node[OWNER_DOCUMENT],
computed;
if (node[STYLE] && doc[DEFAULT_VIEW] && doc[DEFAULT_VIEW][GET_COMPUTED_STYLE]) {
computed = doc[DEFAULT_VIEW][GET_COMPUTED_STYLE](node, null);
if (computed) { // FF may be null in some cases (ticket #2530548)
val = computed[att];
}
}
return val;
}
});
// normalize reserved word float alternatives ("cssFloat" or "styleFloat")
if (DOCUMENT[DOCUMENT_ELEMENT][STYLE][CSS_FLOAT] !== undefined) {
Y_DOM.CUSTOM_STYLES[FLOAT] = CSS_FLOAT;
} else if (DOCUMENT[DOCUMENT_ELEMENT][STYLE][STYLE_FLOAT] !== undefined) {
Y_DOM.CUSTOM_STYLES[FLOAT] = STYLE_FLOAT;
}
// safari converts transparent to rgba(), others use "transparent"
if (Y.UA.webkit) {
Y_DOM[GET_COMPUTED_STYLE] = function(node, att) {
var view = node[OWNER_DOCUMENT][DEFAULT_VIEW],
val = view[GET_COMPUTED_STYLE](node, '')[att];
if (val === 'rgba(0, 0, 0, 0)') {
val = TRANSPARENT;
}
return val;
};
}
Y.DOM._getAttrOffset = function(node, attr) {
var val = Y.DOM[GET_COMPUTED_STYLE](node, attr),
offsetParent = node.offsetParent,
position,
parentOffset,
offset;
if (val === 'auto') {
position = Y.DOM.getStyle(node, 'position');
if (position === 'static' || position === 'relative') {
val = 0;
} else if (offsetParent && offsetParent[GET_BOUNDING_CLIENT_RECT]) {
parentOffset = offsetParent[GET_BOUNDING_CLIENT_RECT]()[attr];
offset = node[GET_BOUNDING_CLIENT_RECT]()[attr];
if (attr === 'left' || attr === 'top') {
val = offset - parentOffset;
} else {
val = parentOffset - node[GET_BOUNDING_CLIENT_RECT]()[attr];
}
}
}
return val;
};
Y.DOM._getOffset = function(node) {
var pos,
xy = null;
if (node) {
pos = Y_DOM.getStyle(node, 'position');
xy = [
parseInt(Y_DOM[GET_COMPUTED_STYLE](node, 'left'), 10),
parseInt(Y_DOM[GET_COMPUTED_STYLE](node, 'top'), 10)
];
if ( isNaN(xy[0]) ) { // in case of 'auto'
xy[0] = parseInt(Y_DOM.getStyle(node, 'left'), 10); // try inline
if ( isNaN(xy[0]) ) { // default to offset value
xy[0] = (pos === 'relative') ? 0 : node.offsetLeft || 0;
}
}
if ( isNaN(xy[1]) ) { // in case of 'auto'
xy[1] = parseInt(Y_DOM.getStyle(node, 'top'), 10); // try inline
if ( isNaN(xy[1]) ) { // default to offset value
xy[1] = (pos === 'relative') ? 0 : node.offsetTop || 0;
}
}
}
return xy;
};
if (TRANSFORM) {
Y_DOM.CUSTOM_STYLES.transform = {
set: function(node, val, style) {
style[TRANSFORM] = val;
},
get: function(node) {
return Y_DOM[GET_COMPUTED_STYLE](node, TRANSFORM);
}
};
Y_DOM.CUSTOM_STYLES.transformOrigin = {
set: function(node, val, style) {
style[TRANSFORMORIGIN] = val;
},
get: function(node) {
return Y_DOM[GET_COMPUTED_STYLE](node, TRANSFORMORIGIN);
}
};
}