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/**
* ownCloud - News
*
* This file is licensed under the Affero General Public License version 3 or
* later. See the COPYING file.
*
* @author Bernhard Posselt <dev@bernhard-posselt.com>
* @copyright Bernhard Posselt 2014
*/
app.directive('newsScroll', function ($timeout) {
'use strict';
// autopaging
var autoPage = function (enabled, limit, elem, scope) {
if (enabled) {
var counter = 0;
var articles = elem.find('.item');
for (var i = articles.length - 1; i >= 0; i -= 1) {
var item = $(articles[i]);
// if the counter is higher than the size it means
// that it didnt break to auto page yet and that
// there are more items, so break
if (counter >= limit) {
break;
}
// this is only reached when the item is not is
// below the top and we didnt hit the factor yet so
// autopage and break
if (item.position().top < 0) {
scope.$apply(scope.newsScrollAutoPage);
break;
}
counter += 1;
}
}
};
// mark read
var markRead = function (enabled, elem, scope) {
if (enabled) {
var ids = [];
var articles = elem.find('.item:not(.read)');
articles.each(function(index, article) {
var item = $(article);
if (item.position().top <= -50) {
ids.push(parseInt(item.data('id'), 10));
} else {
return false;
}
});
scope.itemIds = ids;
scope.$apply(scope.newsScrollMarkRead);
}
};
return {
restrict: 'A',
scope: {
'newsScrollAutoPage': '&',
'newsScrollMarkRead': '&',
'newsScrollEnabledMarkRead': '=',
'newsScrollEnabledAutoPage': '=',
'newsScrollMarkReadTimeout': '@', // optional, defaults to 1 second
'newsScrollTimeout': '@', // optional, defaults to 1 second
'newsScrollAutoPageWhenLeft': '@' // optional, defaults to 50
},
link: function (scope, elem) {
var allowScroll = true;
var scrollTimeout = scope.newsScrollTimeout || 1;
var markReadTimeout = scope.newsScrollMarkReadTimeout || 1;
var autoPageLimit = scope.newsScrollAutoPageWhenLeft || 50;
var scrollHandler = function () {
// allow only one scroll event to trigger at once
if (allowScroll) {
allowScroll = false;
$timeout(function () {
allowScroll = true;
}, scrollTimeout*1000);
autoPage(scope.newsScrollEnabledAutoPage,
autoPageLimit,
elem,
scope);
// allow user to undo accidental scroll
$timeout(function () {
markRead(scope.newsScrollEnabledMarkRead,
elem,
scope);
}, markReadTimeout*1000);
}
};
elem.on('scroll', scrollHandler);
// remove scroll handler if element is destroyed
scope.$on('$destroy', function () {
elem.off('scroll', scrollHandler);
});
}
};
});
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