/**
* Provides standard module support for Widgets through an extension.
*
* @module widget-stdmod
*/
var L = Y.Lang,
Node = Y.Node,
NodeList = Y.NodeList,
UA = Y.UA,
Widget = Y.Widget,
EMPTY = "",
HD = "hd",
BD = "bd",
FT = "ft",
HEADER = "header",
BODY = "body",
FOOTER = "footer",
FILL_HEIGHT = "fillHeight",
STDMOD = "stdmod",
PX = "px",
NODE_SUFFIX = "Node",
CONTENT_SUFFIX = "Content",
INNER_HTML = "innerHTML",
FIRST_CHILD = "firstChild",
CHILD_NODES = "childNodes",
CREATE_DOCUMENT_FRAGMENT = "createDocumentFragment",
OWNER_DOCUMENT = "ownerDocument",
CONTENT_BOX = "contentBox",
BOUNDING_BOX = "boundingBox",
HEIGHT = "height",
OFFSET_HEIGHT = "offsetHeight",
AUTO = "auto",
HeaderChange = "headerContentChange",
BodyChange = "bodyContentChange",
FooterChange = "footerContentChange",
FillHeightChange = "fillHeightChange",
HeightChange = "HeightChange",
ContentUpdate = "contentUpdate",
RENDERUI = "renderUI",
BINDUI = "bindUI",
SYNCUI = "syncUI",
UI = Y.Widget.UI_SRC;
/**
* Widget extension, which can be used to add Standard Module support to the
* base Widget class, through the <a href="Base.html#method_build">Base.build</a>
* method.
* <p>
* The extension adds header, body and footer sections to the Widget's content box and
* provides the corresponding methods and attributes to modify the contents of these sections.
* </p>
* @class WidgetStdMod
* @param {Object} The user configuration object
*/
function StdMod(config) {
this._stdModNode = this.get(CONTENT_BOX);
Y.after(this._renderUIStdMod, this, RENDERUI);
Y.after(this._bindUIStdMod, this, BINDUI);
Y.after(this._syncUIStdMod, this, SYNCUI);
}
/**
* Constant used to refer the the standard module header, in methods which expect a section specifier
*
* @property WidgetStdMod.HEADER
* @static
* @type String
*/
StdMod.HEADER = HEADER;
/**
* Constant used to refer the the standard module body, in methods which expect a section specifier
*
* @property WidgetStdMod.BODY
* @static
* @type String
*/
StdMod.BODY = BODY;
/**
* Constant used to refer the the standard module footer, in methods which expect a section specifier
*
* @property WidgetStdMod.FOOTER
* @static
* @type String
*/
StdMod.FOOTER = FOOTER;
/**
* Constant used to specify insertion position, when adding content to sections of the standard module in
* methods which expect a "where" argument.
* <p>
* Inserts new content <em>before</em> the sections existing content.
* </p>
* @property WidgetStdMod.AFTER
* @static
* @type String
*/
StdMod.AFTER = "after";
/**
* Constant used to specify insertion position, when adding content to sections of the standard module in
* methods which expect a "where" argument.
* <p>
* Inserts new content <em>before</em> the sections existing content.
* </p>
* @property WidgetStdMod.BEFORE
* @static
* @type String
*/
StdMod.BEFORE = "before";
/**
* Constant used to specify insertion position, when adding content to sections of the standard module in
* methods which expect a "where" argument.
* <p>
* <em>Replaces</em> the sections existing content, with new content.
* </p>
* @property WidgetStdMod.REPLACE
* @static
* @type String
*/
StdMod.REPLACE = "replace";
var STD_HEADER = StdMod.HEADER,
STD_BODY = StdMod.BODY,
STD_FOOTER = StdMod.FOOTER,
AFTER = StdMod.AFTER,
BEFORE = StdMod.BEFORE;
/**
* Static property used to define the default attribute
* configuration introduced by WidgetStdMod.
*
* @property WidgetStdMod.ATTRS
* @type Object
* @static
*/
StdMod.ATTRS = {
/**
* @attribute headerContent
* @type {String | Node}
* @default undefined
* @description The content to be added to the header section. This will replace any existing content
* in the header. If you want to append, or insert new content, use the <a href="#method_setStdModContent">setStdModContent</a> method.
*/
headerContent: {
value:null
},
/**
* @attribute footerContent
* @type {String | Node}
* @default undefined
* @description The content to be added to the footer section. This will replace any existing content
* in the footer. If you want to append, or insert new content, use the <a href="#method_setStdModContent">setStdModContent</a> method.
*/
footerContent: {
value:null
},
/**
* @attribute bodyContent
* @type {String | Node}
* @default undefined
* @description The content to be added to the body section. This will replace any existing content
* in the body. If you want to append, or insert new content, use the <a href="#method_setStdModContent">setStdModContent</a> method.
*/
bodyContent: {
value:null
},
/**
* @attribute fillHeight
* @type {String}
* @default WidgetStdMod.BODY
* @description The section (WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER) which should be resized to fill the height of the standard module, when a
* height is set on the Widget. If a height is not set on the widget, then all sections are sized based on
* their content.
*/
fillHeight: {
value: StdMod.BODY,
validator: function(val) {
return this._validateFillHeight(val);
}
}
};
/**
* The HTML parsing rules for the WidgetStdMod class.
*
* @property WidgetStdMod.HTML_PARSER
* @static
* @type Object
*/
StdMod.HTML_PARSER = {
headerContent: function(contentBox) {
return this._parseStdModHTML(STD_HEADER);
},
bodyContent: function(contentBox) {
return this._parseStdModHTML(STD_BODY);
},
footerContent : function(contentBox) {
return this._parseStdModHTML(STD_FOOTER);
}
};
/**
* Static hash of default class names used for the header,
* body and footer sections of the standard module, keyed by
* the section identifier (WidgetStdMod.STD_HEADER, WidgetStdMod.STD_BODY, WidgetStdMod.STD_FOOTER)
*
* @property WidgetStdMod.SECTION_CLASS_NAMES
* @static
* @type Object
*/
StdMod.SECTION_CLASS_NAMES = {
header: Widget.getClassName(HD),
body: Widget.getClassName(BD),
footer: Widget.getClassName(FT)
};
/**
* The template HTML strings for each of the standard module sections. Section entries are keyed by the section constants,
* WidgetStdMod.HEADER, WidgetStdMod.BODY, WidgetStdMod.FOOTER, and contain the HTML to be added for each section.
* e.g.
* <pre>
* {
* header : '<div class="yui-widget-hd"></div>',
* body : '<div class="yui-widget-bd"></div>',
* footer : '<div class="yui-widget-ft"></div>'
* }
* </pre>
* @property WidgetStdMod.TEMPLATES
* @type Object
* @static
*/
StdMod.TEMPLATES = {
header : '<div class="' + StdMod.SECTION_CLASS_NAMES[STD_HEADER] + '"></div>',
body : '<div class="' + StdMod.SECTION_CLASS_NAMES[STD_BODY] + '"></div>',
footer : '<div class="' + StdMod.SECTION_CLASS_NAMES[STD_FOOTER] + '"></div>'
};
StdMod.prototype = {
/**
* Synchronizes the UI to match the Widgets standard module state.
* <p>
* This method is invoked after syncUI is invoked for the Widget class
* using YUI's aop infrastructure.
* </p>
* @method _syncUIStdMod
* @protected
*/
_syncUIStdMod : function() {
this._uiSetStdMod(STD_HEADER, this.get(STD_HEADER + CONTENT_SUFFIX));
this._uiSetStdMod(STD_BODY, this.get(STD_BODY + CONTENT_SUFFIX));
this._uiSetStdMod(STD_FOOTER, this.get(STD_FOOTER + CONTENT_SUFFIX));
this._uiSetFillHeight(this.get(FILL_HEIGHT));
},
/**
* Creates/Initializes the DOM for standard module support.
* <p>
* This method is invoked after renderUI is invoked for the Widget class
* using YUI's aop infrastructure.
* </p>
* @method _renderUIStdMod
* @protected
*/
_renderUIStdMod : function() {
this._stdModNode.addClass(Widget.getClassName(STDMOD));
},
/**
* Binds event listeners responsible for updating the UI state in response to
* Widget standard module related state changes.
* <p>
* This method is invoked after bindUI is invoked for the Widget class
* using YUI's aop infrastructure.
* </p>
* @method _bindUIStdMod
* @protected
*/
_bindUIStdMod : function() {
this.after(HeaderChange, this._afterHeaderChange);
this.after(BodyChange, this._afterBodyChange);
this.after(FooterChange, this._afterFooterChange);
this.after(FillHeightChange, this._afterFillHeightChange);
this.after(HeightChange, this._fillHeight);
this.after(ContentUpdate, this._fillHeight);
},
/**
* Default attribute change listener for the headerContent attribute, responsible
* for updating the UI, in response to attribute changes.
*
* @method _afterHeaderChange
* @protected
* @param {EventFacade} e The event facade for the attribute change
*/
_afterHeaderChange : function(e) {
if (e.src !== UI) {
this._uiSetStdMod(STD_HEADER, e.newVal, e.stdModPosition);
}
},
/**
* Default attribute change listener for the bodyContent attribute, responsible
* for updating the UI, in response to attribute changes.
*
* @method _afterBodyChange
* @protected
* @param {EventFacade} e The event facade for the attribute change
*/
_afterBodyChange : function(e) {
if (e.src !== UI) {
this._uiSetStdMod(STD_BODY, e.newVal, e.stdModPosition);
}
},
/**
* Default attribute change listener for the footerContent attribute, responsible
* for updating the UI, in response to attribute changes.
*
* @method _afterFooterChange
* @protected
* @param {EventFacade} e The event facade for the attribute change
*/
_afterFooterChange : function(e) {
if (e.src !== UI) {
this._uiSetStdMod(STD_FOOTER, e.newVal, e.stdModPosition);
}
},
/**
* Default attribute change listener for the fillHeight attribute, responsible
* for updating the UI, in response to attribute changes.
*
* @method _afterFillHeightChange
* @protected
* @param {EventFacade} e The event facade for the attribute change
*/
_afterFillHeightChange: function (e) {
this._uiSetFillHeight(e.newVal);
},
/**
* Default validator for the fillHeight attribute. Verifies that the
* value set is a valid section specifier - one of WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER,
* or a falsey value if fillHeight is to be disabled.
*
* @method _validateFillHeight
* @protected
* @param {String} val The section which should be setup to fill height, or false/null to disable fillHeight
* @return true if valid, false if not
*/
_validateFillHeight : function(val) {
return !val || val == StdMod.BODY || val == StdMod.HEADER || val == StdMod.FOOTER;
},
/**
* Updates the rendered UI, to resize the provided section so that the standard module fills out
* the specified widget height. Note: This method does not check whether or not a height is set
* on the Widget.
*
* @method _uiSetFillHeight
* @protected
* @param {String} fillSection A valid section specifier - one of WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER
*/
_uiSetFillHeight : function(fillSection) {
var fillNode = this.getStdModNode(fillSection);
var currNode = this._currFillNode;
if (currNode && fillNode !== currNode){
currNode.setStyle(HEIGHT, EMPTY);
}
if (fillNode) {
this._currFillNode = fillNode;
}
this._fillHeight();
},
/**
* Updates the rendered UI, to resize the current section specified by the fillHeight attribute, so
* that the standard module fills out the Widget height. If a height has not been set on Widget,
* the section is not resized (height is set to "auto").
*
* @method _fillHeight
* @private
*/
_fillHeight : function() {
if (this.get(FILL_HEIGHT)) {
var height = this.get(HEIGHT);
if (height != EMPTY && height != AUTO) {
this.fillHeight(this._currFillNode);
}
}
},
/**
* Updates the rendered UI, adding the provided content (either an HTML string, or node reference),
* to the specified section. The content is either added before, after or replaces existing content
* in the section, based on the value of the <code>where</code> argument.
*
* @method _uiSetStdMod
* @protected
*
* @param {String} section The section to be updated. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
* @param {String | Node} content The new content (either as an HTML string, or Node reference) to add to the section
* @param {String} where Optional. Either WidgetStdMod.AFTER, WidgetStdMod.BEFORE or WidgetStdMod.REPLACE.
* If not provided, the content will replace existing content in the section.
*/
_uiSetStdMod : function(section, content, where) {
if (content) {
var node = this.getStdModNode(section) || this._renderStdMod(section);
if (content instanceof Node || content instanceof NodeList) {
this._addNodeRef(node, content, where);
} else {
this._addNodeHTML(node, content, where);
}
this.set(section + CONTENT_SUFFIX, this._getStdModContent(section), {src:UI});
this.fire(ContentUpdate);
}
},
/**
* Creates the DOM node for the given section, and inserts it into the correct location in the contentBox.
*
* @method _renderStdMod
* @protected
* @param {String} section The section to create/render. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
* @return {Node} A reference to the added section node
*/
_renderStdMod : function(section) {
var contentBox = this.get(CONTENT_BOX),
sectionNode = this._findStdModSection(section);
if (!sectionNode) {
sectionNode = this._getStdModTemplate(section);
}
this._insertStdModSection(contentBox, section, sectionNode);
this[section + NODE_SUFFIX] = sectionNode;
return this[section + NODE_SUFFIX];
},
/**
* Helper method to insert the Node for the given section into the correct location in the contentBox.
*
* @method _insertStdModSection
* @private
* @param {Node} contentBox A reference to the Widgets content box.
* @param {String} section The section to create/render. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
* @param {Node} sectionNode The Node for the section.
*/
_insertStdModSection : function(contentBox, section, sectionNode) {
var fc = contentBox.get(FIRST_CHILD);
if (section === STD_FOOTER || !fc) {
contentBox.appendChild(sectionNode);
} else {
if (section === STD_HEADER) {
contentBox.insertBefore(sectionNode, fc);
} else {
// BODY
var footer = this[STD_FOOTER + NODE_SUFFIX];
if (footer) {
contentBox.insertBefore(sectionNode, footer);
} else {
contentBox.appendChild(sectionNode);
}
}
}
},
/**
* Gets a new Node reference for the given standard module section, by cloning
* the stored template node.
*
* @method _getStdModTemplate
* @protected
* @param {String} section The section to create a new node for. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
* @return {Node} The new Node instance for the section
*/
_getStdModTemplate : function(section) {
return Node.create(StdMod.TEMPLATES[section], this._stdModNode.get(OWNER_DOCUMENT));
},
/**
* Helper method to add the given HTML string to the node reference provided.
* The HTML is added either before, after or replaces the existing node content
* based on the value of the <code>where</code> argument.
*
* @method _addNodeHTML
* @private
*
* @param {Node} node The section Node to be updated.
* @param {String} html The new content HTML string to be added to the section Node.
* @param {String} where Optional. Either WidgetStdMod.AFTER, WidgetStdMod.BEFORE or WidgetStdMod.REPLACE.
* If not provided, the content will replace Nodes existing content.
*/
_addNodeHTML : function(node, html, where) {
if (where == AFTER) {
node.set(INNER_HTML, node.get(INNER_HTML) + html);
} else if (where == BEFORE) {
node.set(INNER_HTML, html + node.get(INNER_HTML));
} else {
node.set(INNER_HTML, html);
}
},
/**
* Helper method to add nodes, to another node.
* The child node(s) are added either before, after or replaces the existing node content
* based on the value of the <code>where</code> argument.
*
* @method _addNodeRef
* @private
*
* @param {Node} node The section Node to be updated.
* @param {Node|NodeList} children The new content Node, or NodeList to be added to section Node provided.
* @param {String} where Optional. Either WidgetStdMod.AFTER, WidgetStdMod.BEFORE or WidgetStdMod.REPLACE.
* If not provided, the content will replace existing content in the Node.
*/
_addNodeRef : function(node, children, where) {
var append = true,
i, s;
if (where == BEFORE) {
var n = node.get(FIRST_CHILD);
if (n) {
if (children instanceof NodeList) {
for (i = children.size() - 1; i >=0; --i) {
node.insertBefore(children.item(i), n);
}
} else {
node.insertBefore(children, n);
}
append = false;
}
} else if (where != AFTER) { // replace
node.set(INNER_HTML, EMPTY);
}
if (append) {
if (children instanceof NodeList) {
for (i = 0, s = children.size(); i < s; ++i) {
node.appendChild(children.item(i));
}
} else {
node.appendChild(children);
}
}
},
/**
* Helper method to obtain the precise height of the node provided, including padding and border.
* The height could be a sub-pixel value for certain browsers, such as Firefox 3.
*
* @method _getPreciseHeight
* @private
* @param {Node} node The node for which the precise height is required.
* @return {Number} The height of the Node including borders and padding, possibly a float.
*/
_getPreciseHeight : function(node) {
var height = (node) ? node.get(OFFSET_HEIGHT) : 0,
getBCR = "getBoundingClientRect";
if (node && node.hasMethod(getBCR)) {
var preciseRegion = node.invoke(getBCR);
if (preciseRegion) {
height = preciseRegion.bottom - preciseRegion.top;
}
}
return height;
},
/**
* Helper method to query the rendered contents of the contentBox to find the
* node for the given section if it exists.
*
* @method _findStdModSection
* @private
* @param {String} section The section for which the render Node is to be found. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
* @return {Node} The rendered node for the given section, or null if not found.
*/
_findStdModSection: function(section) {
return this.get(CONTENT_BOX).query("> ." + StdMod.SECTION_CLASS_NAMES[section]);
},
/**
* Utility method, used by WidgetStdMods HTML_PARSER implementation
* to extract data for each section from markup.
*
* @method _parseStdModHTML
* @private
* @param {String} section
* @return {String} Inner HTML string with the contents of the section
*/
_parseStdModHTML : function(section) {
var node = this._findStdModSection(section),
docFrag, children;
if (node) {
docFrag = node.get(OWNER_DOCUMENT).invoke(CREATE_DOCUMENT_FRAGMENT);
children = node.get(CHILD_NODES);
for (var i = children.size() - 1; i >= 0; i--) {
var fc = docFrag.get(FIRST_CHILD);
if (fc) {
docFrag.insertBefore(children.item(i), fc);
} else {
docFrag.appendChild(children.item(i));
}
}
return docFrag;
}
return null;
},
/**
* Retrieves the child nodes (content) of a standard module section
*
* @method _getStdModContent
* @private
* @param {String} section The standard module section whose child nodes are to be retrieved. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
* @return {Node} The child node collection of the standard module section.
*/
_getStdModContent : function(section) {
return (this[section + NODE_SUFFIX]) ? this[section + NODE_SUFFIX].get(CHILD_NODES) : null;
},
/**
* Updates the body section of the standard module with the content provided (either an HTML string, or node reference).
* <p>
* This method can be used instead of the corresponding section content attribute if you'd like to retain the current content of the section,
* and insert content before or after it, by specifying the <code>where</code> argument.
* </p>
* @method setStdModContent
* @param {String} section The standard module section whose content is to be updated. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
* @param {String | Node} content The content to be added, either an HTML string or a Node reference.
* @param {String} where Optional. Either WidgetStdMod.AFTER, WidgetStdMod.BEFORE or WidgetStdMod.REPLACE.
* If not provided, the content will replace existing content in the section.
*/
setStdModContent : function(section, content, where) {
this.set(section + CONTENT_SUFFIX, content, {stdModPosition:where});
},
/**
* Returns the node reference for the given section. Note: The DOM is not queried for the node reference. The reference
* stored by the widget instance is returned if set.
*
* @method getStdModNode
* @param {String} section The section whose node reference is required. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
* @return {Node} The node reference for the section, or null if not set.
*/
getStdModNode : function(section) {
return this[section + NODE_SUFFIX] || null;
},
/**
* Sets the height on the provided header, body or footer element to
* fill out the height of the Widget. It determines the height of the
* widgets bounding box, based on it's configured height value, and
* sets the height of the provided section to fill out any
* space remaining after the other standard module section heights
* have been accounted for.
*
* <p><strong>NOTE:</strong> This method is not designed to work if an explicit
* height has not been set on the Widget, since for an "auto" height Widget,
* the heights of the header/body/footer will drive the height of the Widget.</p>
*
* @method fillHeight
* @param {Node} node The node which should be resized to fill out the height
* of the Widget bounding box. Should be a standard module section node which belongs
* to the widget.
*/
fillHeight : function(node) {
if (node) {
var boundingBox = this.get(BOUNDING_BOX),
stdModNodes = [this.headerNode, this.bodyNode, this.footerNode],
stdModNode,
total = 0,
filled = 0,
remaining = 0,
validNode = false;
for (var i = 0, l = stdModNodes.length; i < l; i++) {
stdModNode = stdModNodes[i];
if (stdModNode) {
if (stdModNode !== node) {
filled += this._getPreciseHeight(stdModNode);
} else {
validNode = true;
}
}
}
if (validNode) {
if (UA.ie || UA.opera) {
// Need to set height to 0, to allow height to be reduced
node.setStyle(HEIGHT, 0 + PX);
}
total = parseInt(boundingBox.getComputedStyle(HEIGHT), 10);
if (L.isNumber(total)) {
remaining = total - filled;
if (remaining >= 0) {
node.setStyle(HEIGHT, remaining + PX);
}
// Re-adjust height if required, to account for el padding and border
var offsetHeight = this.get(CONTENT_BOX).get(OFFSET_HEIGHT);
if (offsetHeight != total) {
remaining = remaining - (offsetHeight - total);
node.setStyle(HEIGHT, remaining + PX);
}
}
}
}
}
};
Y.WidgetStdMod = StdMod;