source: Dev/branches/rest-dojo-ui/client/dojo/dom-style.js @ 263

define(["./_base/sniff", "./dom"], function(has, dom){
        // module:
        //              dojo/dom-style
        // summary:
        //              This module defines the core dojo DOM style API.

        // =============================
        // Style Functions
        // =============================

        // getComputedStyle drives most of the style code.
        // Wherever possible, reuse the returned object.
        //
        // API functions below that need to access computed styles accept an
        // optional computedStyle parameter.
        // If this parameter is omitted, the functions will call getComputedStyle themselves.
        // This way, calling code can access computedStyle once, and then pass the reference to
        // multiple API functions.

        /*=====
        dojo.getComputedStyle = function(node){
                // summary:
                //              Returns a "computed style" object.
                //
                // description:
                //              Gets a "computed style" object which can be used to gather
                //              information about the current state of the rendered node.
                //
                //              Note that this may behave differently on different browsers.
                //              Values may have different formats and value encodings across
                //              browsers.
                //
                //              Note also that this method is expensive.  Wherever possible,
                //              reuse the returned object.
                //
                //              Use the dojo.style() method for more consistent (pixelized)
                //              return values.
                //
                // node: DOMNode
                //              A reference to a DOM node. Does NOT support taking an
                //              ID string for speed reasons.
                // example:
                //      |       dojo.getComputedStyle(dojo.byId('foo')).borderWidth;
                //
                // example:
                //              Reusing the returned object, avoiding multiple lookups:
                //      |       var cs = dojo.getComputedStyle(dojo.byId("someNode"));
                //      |       var w = cs.width, h = cs.height;
                return; // CSS2Properties
        }
        =====*/

        /*=====
        dojo.toPixelValue = function(node, value){
                // summary:
                //      converts style value to pixels on IE or return a numeric value.
                // node: DOMNode
                // value: String
                // returns: Number
        };
        =====*/

        /*=====
        dojo._toPixelValue = function(node, value){
                // summary:
                //              Existing alias for `dojo._toPixelValue`. Deprecated, will be removed in 2.0.
        };
        =====*/

        /*=====
        dojo.getStyle = function(node, name){
                // summary:
                //              Accesses styles on a node.
                // description:
                //              Getting the style value uses the computed style for the node, so the value
                //              will be a calculated value, not just the immediate node.style value.
                //              Also when getting values, use specific style names,
                //              like "borderBottomWidth" instead of "border" since compound values like
                //              "border" are not necessarily reflected as expected.
                //              If you want to get node dimensions, use `dojo.marginBox()`,
                //              `dojo.contentBox()` or `dojo.position()`.
                // node: DOMNode|String
                //              id or reference to node to get style for
                // name: String?
                //              the style property to get
                // example:
                //              Passing only an ID or node returns the computed style object of
                //              the node:
                //      |       dojo.getStyle("thinger");
                // example:
                //              Passing a node and a style property returns the current
                //              normalized, computed value for that property:
                //      |       dojo.getStyle("thinger", "opacity"); // 1 by default
        };
        =====*/

        /*=====
        dojo.setStyle = function(node, name, value){
                // summary:
                //              Sets styles on a node.
                // node: DOMNode|String
                //              id or reference to node to set style for
                // name: String|Object
                //              the style property to set in DOM-accessor format
                //              ("borderWidth", not "border-width") or an object with key/value
                //              pairs suitable for setting each property.
                // value: String?
                //              If passed, sets value on the node for style, handling
                //              cross-browser concerns.  When setting a pixel value,
                //              be sure to include "px" in the value. For instance, top: "200px".
                //              Otherwise, in some cases, some browsers will not apply the style.
                //
                // example:
                //              Passing a node, a style property, and a value changes the
                //              current display of the node and returns the new computed value
                //      |       dojo.setStyle("thinger", "opacity", 0.5); // == 0.5
                //
                // example:
                //              Passing a node, an object-style style property sets each of the values in turn and returns the computed style object of the node:
                //      |       dojo.setStyle("thinger", {
                //      |               "opacity": 0.5,
                //      |               "border": "3px solid black",
                //      |               "height": "300px"
                //      |       });
                //
                // example:
                //              When the CSS style property is hyphenated, the JavaScript property is camelCased.
                //              font-size becomes fontSize, and so on.
                //      |       dojo.setStyle("thinger",{
                //      |               fontSize:"14pt",
                //      |               letterSpacing:"1.2em"
                //      |       });
                //
                // example:
                //              dojo.NodeList implements .style() using the same syntax, omitting the "node" parameter, calling
                //              dojo.style() on every element of the list. See: `dojo.query()` and `dojo.NodeList()`
                //      |       dojo.query(".someClassName").style("visibility","hidden");
                //      |       // or
                //      |       dojo.query("#baz > div").style({
                //      |               opacity:0.75,
                //      |               fontSize:"13pt"
                //      |       });
        };
        =====*/

        // Although we normally eschew argument validation at this
        // level, here we test argument 'node' for (duck)type,
        // by testing nodeType, ecause 'document' is the 'parentNode' of 'body'
        // it is frequently sent to this function even
        // though it is not Element.
        var getComputedStyle, style = {};
        //>>excludeStart("webkitMobile", kwArgs.webkitMobile);
        if(has("webkit")){
        //>>excludeEnd("webkitMobile");
                getComputedStyle = function(/*DomNode*/node){
                        var s;
                        if(node.nodeType == 1){
                                var dv = node.ownerDocument.defaultView;
                                s = dv.getComputedStyle(node, null);
                                if(!s && node.style){
                                        node.style.display = "";
                                        s = dv.getComputedStyle(node, null);
                                }
                        }
                        return s || {};
                };
        //>>excludeStart("webkitMobile", kwArgs.webkitMobile);
        }else if(has("ie") && (has("ie") < 9 || has("quirks"))){
                getComputedStyle = function(node){
                        // IE (as of 7) doesn't expose Element like sane browsers
                        return node.nodeType == 1 /* ELEMENT_NODE*/ ? node.currentStyle : {};
                };
        }else{
                getComputedStyle = function(node){
                        return node.nodeType == 1 ?
                                node.ownerDocument.defaultView.getComputedStyle(node, null) : {};
                };
        }
        //>>excludeEnd("webkitMobile");
        style.getComputedStyle = getComputedStyle;

        var toPixel;
        //>>excludeStart("webkitMobile", kwArgs.webkitMobile);
        if(!has("ie")){
        //>>excludeEnd("webkitMobile");
                toPixel = function(element, value){
                        // style values can be floats, client code may want
                        // to round for integer pixels.
                        return parseFloat(value) || 0;
                };
        //>>excludeStart("webkitMobile", kwArgs.webkitMobile);
        }else{
                toPixel = function(element, avalue){
                        if(!avalue){ return 0; }
                        // on IE7, medium is usually 4 pixels
                        if(avalue == "medium"){ return 4; }
                        // style values can be floats, client code may
                        // want to round this value for integer pixels.
                        if(avalue.slice && avalue.slice(-2) == 'px'){ return parseFloat(avalue); }
                        var s = element.style, rs = element.runtimeStyle, cs = element.currentStyle,
                                sLeft = s.left, rsLeft = rs.left;
                        rs.left = cs.left;
                        try{
                                // 'avalue' may be incompatible with style.left, which can cause IE to throw
                                // this has been observed for border widths using "thin", "medium", "thick" constants
                                // those particular constants could be trapped by a lookup
                                // but perhaps there are more
                                s.left = avalue;
                                avalue = s.pixelLeft;
                        }catch(e){
                                avalue = 0;
                        }
                        s.left = sLeft;
                        rs.left = rsLeft;
                        return avalue;
                }
        }
        //>>excludeEnd("webkitMobile");
        style.toPixelValue = toPixel;

        // FIXME: there opacity quirks on FF that we haven't ported over. Hrm.

        //>>excludeStart("webkitMobile", kwArgs.webkitMobile);
        var astr = "DXImageTransform.Microsoft.Alpha";
        var af = function(n, f){
                try{
                        return n.filters.item(astr);
                }catch(e){
                        return f ? {} : null;
                }
        };

        //>>excludeEnd("webkitMobile");
        var _getOpacity =
        //>>excludeStart("webkitMobile", kwArgs.webkitMobile);
                has("ie") < 9 || (has("ie") && has("quirks")) ? function(node){
                        try{
                                return af(node).Opacity / 100; // Number
                        }catch(e){
                                return 1; // Number
                        }
                } :
        //>>excludeEnd("webkitMobile");
                function(node){
                        return getComputedStyle(node).opacity;
                };

        var _setOpacity =
                //>>excludeStart("webkitMobile", kwArgs.webkitMobile);
                has("ie") < 9 || (has("ie") && has("quirks")) ? function(/*DomNode*/node, /*Number*/opacity){
                        var ov = opacity * 100, opaque = opacity == 1;
                        node.style.zoom = opaque ? "" : 1;

                        if(!af(node)){
                                if(opaque){
                                        return opacity;
                                }
                                node.style.filter += " progid:" + astr + "(Opacity=" + ov + ")";
                        }else{
                                af(node, 1).Opacity = ov;
                        }

                        // on IE7 Alpha(Filter opacity=100) makes text look fuzzy so disable it altogether (bug #2661),
                        //but still update the opacity value so we can get a correct reading if it is read later.
                        af(node, 1).Enabled = !opaque;

                        if(node.tagName.toLowerCase() == "tr"){
                                for(var td = node.firstChild; td; td = td.nextSibling){
                                        if(td.tagName.toLowerCase() == "td"){
                                                _setOpacity(td, opacity);
                                        }
                                }
                        }
                        return opacity;
                } :
                //>>excludeEnd("webkitMobile");
                function(node, opacity){
                        return node.style.opacity = opacity;
                };

        var _pixelNamesCache = {
                left: true, top: true
        };
        var _pixelRegExp = /margin|padding|width|height|max|min|offset/; // |border
        function _toStyleValue(node, type, value){
                //TODO: should we really be doing string case conversion here? Should we cache it? Need to profile!
                type = type.toLowerCase();
                //>>excludeStart("webkitMobile", kwArgs.webkitMobile);
                if(has("ie")){
                        if(value == "auto"){
                                if(type == "height"){ return node.offsetHeight; }
                                if(type == "width"){ return node.offsetWidth; }
                        }
                        if(type == "fontweight"){
                                switch(value){
                                        case 700: return "bold";
                                        case 400:
                                        default: return "normal";
                                }
                        }
                }
                //>>excludeEnd("webkitMobile");
                if(!(type in _pixelNamesCache)){
                        _pixelNamesCache[type] = _pixelRegExp.test(type);
                }
                return _pixelNamesCache[type] ? toPixel(node, value) : value;
        }

        var _floatStyle = has("ie") ? "styleFloat" : "cssFloat",
                _floatAliases = {"cssFloat": _floatStyle, "styleFloat": _floatStyle, "float": _floatStyle};

        // public API

        style.get = function getStyle(/*DOMNode|String*/ node, /*String?*/ name){
                var n = dom.byId(node), l = arguments.length, op = (name == "opacity");
                if(l == 2 && op){
                        return _getOpacity(n);
                }
                name = _floatAliases[name] || name;
                var s = style.getComputedStyle(n);
                return (l == 1) ? s : _toStyleValue(n, name, s[name] || n.style[name]); /* CSS2Properties||String||Number */
        };

        style.set = function setStyle(/*DOMNode|String*/ node, /*String|Object*/ name, /*String?*/ value){
                var n = dom.byId(node), l = arguments.length, op = (name == "opacity");
                name = _floatAliases[name] || name;
                if(l == 3){
                        return op ? _setOpacity(n, value) : n.style[name] = value; // Number
                }
                for(var x in name){
                        style.set(node, x, name[x]);
                }
                return style.getComputedStyle(n);
        };

        return style;
});