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;(function ()
{
"use strict";
BX.namespace("BX.Landing");
BX.Landing.BlockHeaders = function ()
{
/**
* @type {BX.Landing.BlockHeaderEntry[]}
*/
this.entries = [];
this.observer = new IntersectionObserver(
BX.Landing.BlockHeaderEntry.onIntersection,
this.getObserverOptions()
);
};
BX.Landing.BlockHeaders.prototype = {
getObserverOptions: function ()
{
return {threshold: [0, 1]};
},
/**
* Create entity by node and add in collection
* @param {HTMLElement} node
*/
add: function (node)
{
// todo: sort (what do you mean& :-/
var entry = new BX.Landing.BlockHeaderEntry(node);
this.entries.push(entry);
this.observer.observe(entry.getNodeForObserve());
// todo: how show hidden entries when then in viewport?
},
/**
* Get entry by node
* @param {HTMLElement} node
* @returns {BX.Landing.BlockHeaderEntry}
*/
getEntryByIntersectionTarget: function (node)
{
var result = null;
this.entries.forEach(function (entry)
{
if (node === entry.getNodeForObserve())
{
result = entry;
return true;
}
});
return result;
},
hidePrevEntriess: function ()
{
// todo: how show hidden entries when then in viewport?
}
};
BX.Landing.BlockHeaders.getInstance = function ()
{
return (
BX.Landing.BlockHeaders.instance ||
(BX.Landing.BlockHeaders.instance = new BX.Landing.BlockHeaders())
);
};
var blockHeaders = BX.Landing.BlockHeaders.getInstance();
var onCustomEvent = BX.Landing.Utils.onCustomEvent;
onCustomEvent("BX.Landing.Block:init", function (event)
{
var headerSelector = event.makeRelativeSelector('.u-header');
// in edit mode menu must be like a usual block
if (
(BX.Landing.getMode() === "view" || BX.Landing.getMode() === "preview")
&& event.block.querySelectorAll(headerSelector).length > 0)
{
blockHeaders.add(event.block.querySelector('.u-header'));
}
// todo: scroll-nav (scrollspy)
// todo: scroll to top (with animate)
});
})();