dom/js/dom-ie-style.js

	dom-ie-style.js revision b55b141ccc709c4288c8b28cf63eb829101418e3
/**
 * Add style management functionality to DOM.
 * @module dom
 * @submodule dom-style
 * @for DOM
 */

var CLIENT_TOP = 'clientTop',
    CLIENT_LEFT = 'clientLeft',
    HAS_LAYOUT = 'hasLayout',
    PX = 'px',
    FILTER = 'filter',
    FILTERS = 'filters',
    OPACITY = 'opacity',
    AUTO = 'auto',

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

// use alpha filter for IE opacity
if (document[DOCUMENT_ELEMENT].style[OPACITY] === UNDEFINED &&
        document[DOCUMENT_ELEMENT][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');
            }
        }
    };
}

// IE getComputedStyle
// TODO: unit-less lineHeight (e.g. 1.22)
var 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,

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, PARENT_NODE, 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 = {};

// 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;