# Yahoo! UI Library

### dom 3.0.0

Yahoo! UI Library > dom > dom-ie-style.js (source view)
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    (function(Y) {
    var HAS_LAYOUT = 'hasLayout',
        PX = 'px',
        FILTER = 'filter',
        FILTERS = 'filters',
        OPACITY = 'opacity',
        AUTO = 'auto',

        BORDER_WIDTH = 'borderWidth',
        BORDER_TOP_WIDTH = 'borderTopWidth',
        BORDER_RIGHT_WIDTH = 'borderRightWidth',
        BORDER_BOTTOM_WIDTH = 'borderBottomWidth',
        BORDER_LEFT_WIDTH = 'borderLeftWidth',
        WIDTH = 'width',
        HEIGHT = 'height',
        TRANSPARENT = 'transparent',
        VISIBLE = 'visible',
        GET_COMPUTED_STYLE = 'getComputedStyle',
        UNDEFINED = undefined,
        documentElement = document.documentElement,

        // TODO: unit-less lineHeight (e.g. 1.22)
        re_unit = /^(\d[.\d]*)+(em|ex|px|gd|rem|vw|vh|vm|ch|mm|cm|in|pt|pc|deg|rad|ms|s|hz|khz|%){1}?/i,

        _getStyleObj = function(node) {
            return node.currentStyle || node.style;
        },

        ComputedStyle = {
            CUSTOM_STYLES: {},

            get: function(el, property) {
                var value = '',
                    current;

                if (el) {
                        current = _getStyleObj(el)[property];

                    if (property === OPACITY && Y.DOM.CUSTOM_STYLES[OPACITY]) {
                        value = Y.DOM.CUSTOM_STYLES[OPACITY].get(el);
                    } else if (!current || (current.indexOf && current.indexOf(PX) > -1)) { // no need to convert
                        value = current;
                    } else if (Y.DOM.IE.COMPUTED[property]) { // use compute function
                        value = Y.DOM.IE.COMPUTED[property](el, property);
                    } else if (re_unit.test(current)) { // convert to pixel
                        value = ComputedStyle.getPixel(el, property) + PX;
                    } else {
                        value = current;
                    }
                }

                return value;
            },

            sizeOffsets: {
                width: ['Left', 'Right'],
                height: ['Top', 'Bottom'],
                top: ['Top'],
                bottom: ['Bottom']
            },

            getOffset: function(el, prop) {
                var current = _getStyleObj(el)[prop],                     // value of "width", "top", etc.
                    capped = prop.charAt(0).toUpperCase() + prop.substr(1), // "Width", "Top", etc.
                    offset = 'offset' + capped,                             // "offsetWidth", "offsetTop", etc.
                    pixel = 'pixel' + capped,                               // "pixelWidth", "pixelTop", etc.
                    sizeOffsets = ComputedStyle.sizeOffsets[prop],
                    value = '';

                // IE pixelWidth incorrect for percent
                // manually compute by subtracting padding and border from offset size
                // NOTE: clientWidth/Height (size minus border) is 0 when current === AUTO so offsetHeight is used
                // reverting to auto from auto causes position stacking issues (old impl)
                if (current === AUTO || current.indexOf('%') > -1) {
                    value = el['offset' + capped];

                    if (sizeOffsets[0]) {
                        value -= ComputedStyle.getPixel(el, 'padding' + sizeOffsets[0]);
                        value -= ComputedStyle.getBorderWidth(el, 'border' + sizeOffsets[0] + 'Width', 1);
                    }

                    if (sizeOffsets[1]) {
                        value -= ComputedStyle.getPixel(el, 'padding' + sizeOffsets[1]);
                        value -= ComputedStyle.getBorderWidth(el, 'border' + sizeOffsets[1] + 'Width', 1);
                    }

                } else { // use style.pixelWidth, etc. to convert to pixels
                    // need to map style.width to currentStyle (no currentStyle.pixelWidth)
                    if (!el.style[pixel] && !el.style[prop]) {
                        el.style[prop] = current;
                    }
                    value = el.style[pixel];

                }
                return value + PX;
            },

            borderMap: {
                thin: '2px',
                medium: '4px',
                thick: '6px'
            },

            getBorderWidth: function(el, property, omitUnit) {
                var unit = omitUnit ? '' : PX,
                    current = el.currentStyle[property];

                if (current.indexOf(PX) < 0) { // look up keywords
                    if (ComputedStyle.borderMap[current]) {
                        current = ComputedStyle.borderMap[current];
                    } else {
                        Y.log('borderWidth computing not implemented', 'warn', 'dom-ie-style');
                    }
                }
                return (omitUnit) ? parseFloat(current) : current;
            },

            getPixel: function(node, att) {
                // use pixelRight to convert to px
                var val = null,
                    style = _getStyleObj(node),
                    styleRight = style.right,
                    current = style[att];

                node.style.right = current;
                val = node.style.pixelRight;
                node.style.right = styleRight; // revert

                return val;
            },

            getMargin: function(node, att) {
                var val,
                    style = _getStyleObj(node);

                if (style[att] == AUTO) {
                    val = 0;
                } else {
                    val = ComputedStyle.getPixel(node, att);
                }
                return val + PX;
            },

            getVisibility: function(node, att) {
                var current;
                while ( (current = node.currentStyle) && current[att] == 'inherit') { // NOTE: assignment in test
                    node = node.parentNode;
                }
                return (current) ? current[att] : VISIBLE;
            },

            getColor: function(node, att) {
                var current = _getStyleObj(node)[att];

                if (!current || current === TRANSPARENT) {
                    Y.DOM.elementByAxis(node, 'parentNode', null, function(parent) {
                        current = _getStyleObj(parent)[att];
                        if (current && current !== TRANSPARENT) {
                            node = parent;
                            return true;
                        }
                    });
                }

                return Y.Color.toRGB(current);
            },

            getBorderColor: function(node, att) {
                var current = _getStyleObj(node),
                    val = current[att] || current.color;
                return Y.Color.toRGB(Y.Color.toHex(val));
            }
        },

        //fontSize: getPixelFont,
        IEComputed = {};

    // use alpha filter for IE opacity
    try {
        if (documentElement.style[OPACITY] === UNDEFINED &&
                documentElement[FILTERS]) {
            Y.DOM.CUSTOM_STYLES[OPACITY] = {
                get: function(node) {
                    var val = 100;
                    try { // will error if no DXImageTransform
                        val = node[FILTERS]['DXImageTransform.Microsoft.Alpha'][OPACITY];

                    } catch(e) {
                        try { // make sure its in the document
                            val = node[FILTERS]('alpha')[OPACITY];
                        } catch(err) {
                            Y.log('getStyle: IE opacity filter not found; returning 1', 'warn', 'dom-style');
                        }
                    }
                    return val / 100;
                },

                set: function(node, val, style) {
                    var current,
                        styleObj;

                    if (val === '') { // normalize inline style behavior
                        styleObj = _getStyleObj(node);
                        current = (OPACITY in styleObj) ? styleObj[OPACITY] : 1; // revert to original opacity
                        val = current;
                    }

                    if (typeof style[FILTER] == 'string') { // in case not appended
                        style[FILTER] = 'alpha(' + OPACITY + '=' + val * 100 + ')';

                        if (!node.currentStyle || !node.currentStyle[HAS_LAYOUT]) {
                            style.zoom = 1; // needs layout
                        }
                    }
                }
            };
        }
    } catch(e) {
        Y.log('document.documentElement.filters error (activeX disabled)', 'warn', 'dom-style');
    }

    try {
        document.createElement('div').style.height = '-1px';
    } catch(e) { // IE throws error on invalid style set; trap common cases
        Y.DOM.CUSTOM_STYLES.height = {
            set: function(node, val, style) {
                var floatVal = parseFloat(val);
                if (isNaN(floatVal) || floatVal >= 0) {
                    style.height = val;
                } else {
                    Y.log('invalid style value for height: ' + val, 'warn', 'dom-style');
                }
            }
        };

        Y.DOM.CUSTOM_STYLES.width = {
            set: function(node, val, style) {
                var floatVal = parseFloat(val);
                if (isNaN(floatVal) || floatVal >= 0) {
                    style.width = val;
                } else {
                    Y.log('invalid style value for width: ' + val, 'warn', 'dom-style');
                }
            }
        };
    }

    // TODO: top, right, bottom, left
    IEComputed[WIDTH] = IEComputed[HEIGHT] = ComputedStyle.getOffset;

    IEComputed.color = IEComputed.backgroundColor = ComputedStyle.getColor;

    IEComputed[BORDER_WIDTH] = IEComputed[BORDER_TOP_WIDTH] = IEComputed[BORDER_RIGHT_WIDTH] =
            IEComputed[BORDER_BOTTOM_WIDTH] = IEComputed[BORDER_LEFT_WIDTH] =
            ComputedStyle.getBorderWidth;

    IEComputed.marginTop = IEComputed.marginRight = IEComputed.marginBottom =
            IEComputed.marginLeft = ComputedStyle.getMargin;

    IEComputed.visibility = ComputedStyle.getVisibility;
    IEComputed.borderColor = IEComputed.borderTopColor =
            IEComputed.borderRightColor = IEComputed.borderBottomColor =
            IEComputed.borderLeftColor = ComputedStyle.getBorderColor;

    if (!Y.config.win[GET_COMPUTED_STYLE]) {
        Y.DOM[GET_COMPUTED_STYLE] = ComputedStyle.get;
    }

    Y.namespace('DOM.IE');
    Y.DOM.IE.COMPUTED = IEComputed;
    Y.DOM.IE.ComputedStyle = ComputedStyle;

    })(Y);

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