// Extending Fancytree
// ===================
//
// See also the [live demo](http://wwwendt.de/tech/fancytree/demo/sample-ext-childcounter.html) of this code.
//
// Every extension should have a comment header containing some information
// about the author, copyright and licensing. Also a pointer to the latest
// source code.
// Prefix with `/*!` so the comment is not removed by the minifier.

/*!
 * jquery.fancytree.childcounter.js
 *
 * Add a child counter bubble to tree nodes.
 * (Extension module for jquery.fancytree.js: https://github.com/mar10/fancytree/)
 *
 * Copyright (c) 2014, Martin Wendt (http://wwWendt.de)
 *
 * Released under the MIT license
 * https://github.com/mar10/fancytree/wiki/LicenseInfo
 *
 * @version 2.1.0
 * @date 2014-05-29T16:44
 */

// To keep the global namespace clean, we wrap everything in a closure

;(function($, undefined) {

// Consider to use [strict mode](http://ejohn.org/blog/ecmascript-5-strict-mode-json-and-more/)
"use strict";

// The [coding guidelines](http://contribute.jquery.org/style-guide/js/)
// require jshint compliance.
// But for this sample, we want to allow unused variables for demonstration purpose.

/*jshint unused:false */


// Adding methods
// --------------

// New member functions can be added to the `Fancytree` class.
// This function will be available for every tree instance.
//
//     var tree = $("#tree").fancytree("getTree");
//     tree.countSelected(false);

$.ui.fancytree._FancytreeClass.prototype.countSelected = function(topOnly){
	var tree = this,
		treeOptions = tree.options;
	return tree.getSelectedNodes(topOnly).length;
};


// The `FancytreeNode` class can also be easily extended. This would be called
// like
//
//     node.toUpper();

$.ui.fancytree._FancytreeNodeClass.prototype.toUpper = function(){
	var node = this;
	return node.setTitle(node.title.toUpperCase());
};


// Finally, we can extend the widget API and create functions that are called
// like so:
//
//     $("#tree").fancytree("widgetMethod1", "abc");

$.ui.fancytree.prototype.widgetMethod1 = function(arg1){
	var tree = this.tree;
	return arg1;
};


// Register a Fancytree extension
// ------------------------------
// A full blown extension, extension is available for all trees and can be
// enabled like so (see also the [live demo](http://wwwendt.de/tech/fancytree/demo/sample-ext-childcounter.html)):
//
//    <script src="../src/jquery.fancytree.js" type="text/javascript"></script>
//    <script src="../src/jquery.fancytree.childcounter.js" type="text/javascript"></script>
//    ...
//
//     $("#tree").fancytree({
//         extensions: ["childcounter"],
//         childcounter: {
//             hideExpanded: true
//         },
//         ...
//     });
//


/* 'childcounter' extension */
$.ui.fancytree.registerExtension({
// Every extension must be registered by a unique name.
	name: "childcounter",
// Version information should be compliant with [semver](http://semver.org)
	version: "1.0.0",

// Extension specific options and their defaults.
// This options will be available as `tree.options.childcounter.hideExpanded`

	options: {
		deep: true,
		hideZeros: true,
		hideExpanded: false
	},

// Attributes other than `options` (or functions) can be defined here, and
// will be added to the tree.ext.EXTNAME namespace, in this case `tree.ext.childcounter.foo`.
// They can also be accessed as `this._local.foo` from within the extension
// methods.
	foo: 42,

// Local functions are prefixed with an underscore '_'.
// Callable as `this._local._appendCounter()`.

	_appendCounter: function(bar){
		var tree = this;
	},

// **Override virtual methods for this extension.**
//
// Fancytree implements a number of 'hook methods', prefixed by 'node...' or 'tree...'.
// with a `ctx` argument (see [EventData](http://www.wwwendt.de/tech/fancytree/doc/jsdoc/global.html#EventData)
// for details) and an extended calling context:<br>
// `this`       : the Fancytree instance<br>
// `this._local`: the namespace that contains extension attributes and private methods (same as this.ext.EXTNAME)<br>
// `this._super`: the virtual function that was overridden (member of previous extension or Fancytree)
//
// See also the [complete list of available hook functions](http://www.wwwendt.de/tech/fancytree/doc/jsdoc/Fancytree_Hooks.html).

	/* Init */
// `treeInit` is triggered when a tree is initalized. We can set up classes or
// bind event handlers here...
	treeInit: function(ctx){
		var tree = this, // same as ctx.tree,
			opts = ctx.options,
			extOpts = ctx.options.childcounter;
// Optionally check for dependencies with other extensions
		/* this._requireExtension("glyph", false, false); */
// Call the base implementation
		this._super(ctx);
// Add a class to the tree container
		this.$container.addClass("fancytree-ext-childcounter");
	},

// Destroy this tree instance (we only call the default implementation, so
// this method could as well be omitted).

	treeDestroy: function(ctx){
		this._super(ctx);
	},

// Overload the `renderTitle` hook, to append a counter badge
	nodeRenderTitle: function(ctx, title) {
		var node = ctx.node,
			extOpts = ctx.options.childcounter,
			count = (node.data.childCounter == null) ? node.countChildren(extOpts.deep) : +node.data.childCounter;
// Let the base implementation render the title
		this._super(ctx, title);
// Append a counter badge
		if( (count || ! extOpts.hideZeros) && (!node.isExpanded() || !extOpts.hideExpanded) ){
			$("span.fancytree-icon", node.span).append($("<span class='fancytree-childcounter'/>").text(count));
		}
	},
// Overload the `setExpanded` hook, so the counters are updated
	nodeSetExpanded: function(ctx, flag, opts) {
		var tree = ctx.tree,
			node = ctx.node;
// Let the base implementation expand/collapse the node, then redraw the title
// after the animation has finished
		return this._super(ctx, flag, opts).always(function(){
			tree.nodeRenderTitle(ctx);
		});
	}

// End of extension definition
});
// End of namespace closure
}(jQuery));