From 2bb6bc03b5c7c2eb6465d2c05159028ede6c93b4 Mon Sep 17 00:00:00 2001
From: Bernhard Posselt <dev@bernhard-posselt.com>
Date: Thu, 22 May 2014 15:09:57 +0200
Subject: add autopaging directive

---
 js/directive/NewsScroll.js | 110 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 js/directive/NewsScroll.js

(limited to 'js/directive')

diff --git a/js/directive/NewsScroll.js b/js/directive/NewsScroll.js
new file mode 100644
index 000000000..5972cce67
--- /dev/null
+++ b/js/directive/NewsScroll.js
@@ -0,0 +1,110 @@
+/**
+ * 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';
+
+    return {
+        restrict: 'A',
+        scope: {
+            'newsScrollAutoPage': '&',
+            'newsScrollMarkRead': '&',
+            'newsScrollDisabledMarkRead': '=',
+            'newsScrollDisabledAutoPage': '=',
+            'newsScrollMarkReadTimeout': '@',  // optional, defaults to 1 second
+            'newsScrollTimeout': '@',  // optional, defaults to 1 second
+            'newsScrollAutoPageWhenLeft': '@',  // optional, defaults to 50
+            'newsScrollItemsSelector': '@'  // optional, defaults to .items
+        },
+        link: (scope, elem) => {
+            let scrolling = false;
+
+            scope.newsScrollTimeout = scope.newsScrollTimeout || 1;
+            scope.newsScrollMarkReadTimeout =
+                scope.newsScrollMarkReadTimeout || 1;
+            scope.newsScrollAutoPageWhenLeft =
+                scope.newsScrollAutoPageWhenLeft || 50;
+            scope.newsScrollItemsSelector =
+                scope.newsScrollItemsSelector || '.items';
+
+
+            elem.on('scroll', () => {
+
+                // only allow one scrolling event to trigger
+                if (!scrolling) {
+                    scrolling = true;
+
+                    $timeout(() => {
+                        scrolling = false;
+                    }, scope.newsScrollTimeout*1000);
+
+
+                    let items = $(scope.newsScrollItemsSelector);
+
+                    // autopaging
+                    if (!scope.newsScrollDisabledAutoPage) {
+                        let counter = 0;
+                        for (let item of reverse(items.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 >= scope.newsScrollAutoPageWhenLeft) {
+                                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.newsScrollAutoPage();
+                                break;
+                            }
+
+                            counter += 1;
+                        }
+                    }
+
+                    // mark read
+                    let markRead = () => {
+                        if (!scope.newsScrollDisabledMarkRead) {
+                            let ids = [];
+                            let unread = items.find('.feed_item:not(.read)');
+
+                            for (let item of unread) {
+                                item = $(item);
+
+                                if (item.position().top <= -50) {
+                                    ids.push(parseInt($(item).data('id'), 10));
+                                } else {
+                                    break;
+                                }
+                            }
+
+                            scope.newsScrollMarkRead(ids);
+                        }
+                    };
+
+                    // allow user to undo accidental scroll
+                    $timeout(() => {
+                        markRead();
+                    }, scope.newsScrollMarkReadTimeout*1000);
+                }
+
+            });
+
+            // remove scroll handler if element is destroyed
+            scope.$on('$destroy', () => {
+                element.off('scroll');
+            });
+        }
+    };
+});
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