# Yahoo! UI Library

### dom 3.0.0b1

Yahoo! UI Library > dom > dom-ie-style.js (source view)
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    (function(Y) {
    var CLIENT_TOP = 'clientTop',
        CLIENT_LEFT = 'clientLeft',
        HAS_LAYOUT = 'hasLayout',
        PX = 'px',
        FILTER = 'filter',
        FILTERS = 'filters',
        OPACITY = 'opacity',
        AUTO = 'auto',
        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_size = /^width|height$/,
        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) {
                        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;
            },

            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.
                    actual,
                    value = '';

                if (current === AUTO) {
                    actual = el[offset]; // offsetHeight/Top etc.
                    if (actual === UNDEFINED) { // likely "right" or "bottom"
                        value = 0;
                    }

                    value = actual;
                    if (re_size.test(prop)) { // account for box model diff
                        el.style[prop] = actual;
                        if (el[offset] > actual) {
                            // the difference is padding + border (works in Standards & Quirks modes)
                            value = actual - (el[offset] - actual);
                        }
                        el.style[prop] = AUTO; // revert to auto
                    }
                } else { // convert units to px
                    if (current.indexOf('%') > -1) { // IE pixelWidth incorrect for percent; manually compute
                        current = el.clientWidth - // offsetWidth - borderWidth
                                ComputedStyle.getPixel(el, 'paddingRight') -
                                ComputedStyle.getPixel(el, 'paddingLeft');
                    }
                    if (!el.style[pixel] && !el.style[prop]) { // need to map style.width to currentStyle (no currentStyle.pixelWidth)
                        el.style[prop] = current;              // no style.pixelWidth if no style.width
                    }
                    value = el.style[pixel];
                }
                return value + PX;
            },

            getBorderWidth: function(el, property) {
                // clientHeight/Width = paddingBox (e.g. offsetWidth - borderWidth)
                // clientTop/Left = borderWidth
                var value = null;
                if (!el.currentStyle || !el.currentStyle[HAS_LAYOUT]) { // TODO: unset layout?
                    el.style.zoom = 1; // need layout to measure client
                }

                switch(property) {
                    case BORDER_TOP_WIDTH:
                        value = el[CLIENT_TOP];
                        break;
                    case BORDER_BOTTOM_WIDTH:
                        value = el.offsetHeight - el.clientHeight - el[CLIENT_TOP];
                        break;
                    case BORDER_LEFT_WIDTH:
                        value = el[CLIENT_LEFT];
                        break;
                    case BORDER_RIGHT_WIDTH:
                        value = el.offsetWidth - el.clientWidth - el[CLIENT_LEFT];
                        break;
                }
                return value + PX;
            },

            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
    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
                    }
                }
            }
        };
    }

    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) {
                if (parseInt(val, 10) >= 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) {
                if (parseInt(val, 10) >= 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_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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