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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', ($timeout) => {
'use strict';
// autopaging
let autoPage = (enabled, limit, callback, elem) => {
if (enabled) {
let counter = 0;
for (let item of reverse(elem.find('.feed_item'))) {
item = $(item);
// 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) {
callback();
break;
}
counter += 1;
}
}
};
// mark read
let markRead = (enabled, callback, elem) => {
if (enabled) {
let ids = [];
for (let item of elem.find('.feed_item:not(.read)')) {
item = $(item);
if (item.position().top <= -50) {
ids.push(parseInt(item.data('id'), 10));
} else {
break;
}
}
callback(ids);
}
};
return {
restrict: 'A',
scope: {
'newsScrollAutoPage': '&',
'newsScrollMarkRead': '&',
'newsScrollEnabledMarkRead': '=',
'newsScrollEnableAutoPage': '=',
'newsScrollMarkReadTimeout': '@', // optional, defaults to 1 second
'newsScrollTimeout': '@', // optional, defaults to 1 second
'newsScrollAutoPageWhenLeft': '@' // optional, defaults to 50
},
link: (scope, elem) => {
let allowScroll = true;
scope.newsScrollTimeout = scope.newsScrollTimeout || 1;
scope.newsScrollMarkReadTimeout =
scope.newsScrollMarkReadTimeout || 1;
scope.newsScrollAutoPageWhenLeft =
scope.newsScrollAutoPageWhenLeft || 50;
let scrollHandler = () => {
// allow only one scroll event to trigger at once
if (allowScroll) {
allowScroll = false;
$timeout(() => {
allowScroll = true;
}, scope.newsScrollTimeout*1000);
autoPage(scope.newsScrollEnableAutoPage,
scope.newsScrollAutoPageWhenLeft,
scope.newsScrollAutoPage,
elem);
// allow user to undo accidental scroll
$timeout(() => {
markRead(scope.newsScrollEnabledMarkRead,
scope.newsScrollMarkRead,
elem);
}, scope.newsScrollMarkReadTimeout*1000);
}
};
elem.on('scroll', scrollHandler);
// remove scroll handler if element is destroyed
scope.$on('$destroy', () => {
elem.off('scroll', scrollHandler);
});
}
};
});
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