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YUI.add('align-plugin', function (Y, NAME) {
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/**
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* Provides advanced positioning support for Node via a Plugin
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* for centering and alignment.
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* @module align-plugin
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*/
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var OFFSET_WIDTH = 'offsetWidth',
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OFFSET_HEIGHT = 'offsetHeight',
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undefined = undefined;
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/**
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* Node plugin which can be used to align a node with another node,
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* region, or the viewport.
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*
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* @class Plugin.Align
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* @param {Object} User configuration object
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*/
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function Align(config) {
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if (config.host) {
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this._host = config.host;
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}
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}
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Align.prototype = {
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/**
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* Aligns node with a point on another node or region.
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* Possible alignment points are:
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* <dl>
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* <dt>tl</dt>
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* <dd>top left</dd>
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* <dt>tr</dt>
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* <dd>top right</dd>
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* <dt>bl</dt>
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* <dd>bottom left</dd>
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* <dt>br</dt>
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* <dd>bottom right</dd>
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* <dt>tc</dt>
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* <dd>top center</dd>
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* <dt>bc</dt>
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* <dd>bottom center</dd>
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* <dt>rc</dt>
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* <dd>right center</dd>
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* <dt>lc</dt>
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* <dd>left center</dd>
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* <dt>cc</dt>
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* <dd>center center</dd>
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* </dl>
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* @method to
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* @param region {String|Node|HTMLElement|Object} The node or
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* region to align with. Defaults to the viewport region.
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* @param regionPoint {String} The point of the region to align with.
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* @param point {String} The point of the node aligned to the region.
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* @param resize {Boolean} Whether or not the node should re-align when
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* the window is resized. Defaults to false.
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*/
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to: function(region, regionPoint, point, syncOnResize) {
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// cache original args for syncing
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this._syncArgs = Y.Array(arguments);
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if (region.top === undefined) {
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region = Y.one(region).get('region');
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}
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if (region) {
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var xy = [region.left, region.top],
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offxy = [region.width, region.height],
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points = Align.points,
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node = this._host,
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NULL = null,
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size = node.getAttrs([OFFSET_HEIGHT, OFFSET_WIDTH]),
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nodeoff = [0 - size[OFFSET_WIDTH], 0 - size[OFFSET_HEIGHT]], // reverse offsets
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regionFn0 = regionPoint ? points[regionPoint.charAt(0)]: NULL,
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regionFn1 = (regionPoint && regionPoint !== 'cc') ? points[regionPoint.charAt(1)] : NULL,
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nodeFn0 = point ? points[point.charAt(0)] : NULL,
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nodeFn1 = (point && point !== 'cc') ? points[point.charAt(1)] : NULL;
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if (regionFn0) {
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xy = regionFn0(xy, offxy, regionPoint);
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}
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if (regionFn1) {
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xy = regionFn1(xy, offxy, regionPoint);
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}
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if (nodeFn0) {
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xy = nodeFn0(xy, nodeoff, point);
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}
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if (nodeFn1) {
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xy = nodeFn1(xy, nodeoff, point);
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}
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if (xy && node) {
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node.setXY(xy);
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}
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this._resize(syncOnResize);
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}
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return this;
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},
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sync: function() {
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this.to.apply(this, this._syncArgs);
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return this;
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},
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_resize: function(add) {
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var handle = this._handle;
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if (add && !handle) {
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this._handle = Y.on('resize', this._onresize, window, this);
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} else if (!add && handle) {
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handle.detach();
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}
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},
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_onresize: function() {
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var self = this;
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setTimeout(function() { // for performance
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self.sync();
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});
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},
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/**
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* Aligns the center of a node to the center of another node or region.
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* @method center
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* @param region {Node|HTMLElement|Object} optional The node or
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* region to align with. Defaults to the viewport region.
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* the window is resized. If centering to viewport, this defaults
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* to true, otherwise default is false.
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*/
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center: function(region, resize) {
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this.to(region, 'cc', 'cc', resize);
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return this;
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},
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/**
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* Removes the resize handler, if any. This is called automatically
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* when unplugged from the host node.
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* @method destroy
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*/
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destroy: function() {
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var handle = this._handle;
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if (handle) {
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handle.detach();
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}
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}
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};
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Align.points = {
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't': function(xy, off) {
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return xy;
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},
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'r': function(xy, off) {
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return [xy[0] + off[0], xy[1]];
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},
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'b': function(xy, off) {
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return [xy[0], xy[1] + off[1]];
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},
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'l': function(xy, off) {
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return xy;
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},
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'c': function(xy, off, point) {
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var axis = (point[0] === 't' || point[0] === 'b') ? 0 : 1,
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ret, val;
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if (point === 'cc') {
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ret = [xy[0] + off[0] / 2, xy[1] + off[1] / 2];
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} else {
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val = xy[axis] + off[axis] / 2;
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ret = (axis) ? [xy[0], val] : [val, xy[1]];
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}
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return ret;
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}
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};
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Align.NAME = 'Align';
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Align.NS = 'align';
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Align.prototype.constructor = Align;
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Y.namespace('Plugin');
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Y.Plugin.Align = Align;
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}, '3.18.1', {"requires": ["node-screen", "node-pluginhost"]});
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