1 files changed, 37 insertions, 0 deletions
diff --git a/client/components/sidebar/infiniteScrolling.js b/client/components/sidebar/infiniteScrolling.js
new file mode 100644
index 00000000..df3b8901
--- /dev/null
+++ b/client/components/sidebar/infiniteScrolling.js
@@ -0,0 +1,37 @@
+var peakAnticipation = 200;
+
+Mixins.InfiniteScrolling = BlazeComponent.extendComponent({
+  onCreated: function() {
+    this._nextPeak = Infinity;
+  },
+
+  setNextPeak: function(v) {
+    this._nextPeak = v;
+  },
+
+  getNextPeak: function() {
+    return this._nextPeak;
+  },
+
+  resetNextPeak: function() {
+    this._nextPeak = Infinity;
+  },
+
+  // To be overwritten by consumers of this mixin
+  reachNextPeak: function() {
+
+  },
+
+  events: function() {
+    return [{
+      scroll: function(evt) {
+        var domElement = evt.currentTarget;
+        var altitude = domElement.scrollTop + domElement.offsetHeight;
+        altitude += peakAnticipation;
+        if (altitude >= this.callFirstWith(null, 'getNextPeak')) {
+          this.callFirstWith(null, 'reachNextPeak');
+        }
+      }
+    }];
+  }
+});