1 files changed, 46 insertions, 0 deletions
diff --git a/app/assets/javascripts/lib/utils/logoutput_behaviours.js b/app/assets/javascripts/lib/utils/logoutput_behaviours.js
new file mode 100644
index 00000000000..1bf99d935ef
--- /dev/null
+++ b/app/assets/javascripts/lib/utils/logoutput_behaviours.js
@@ -0,0 +1,46 @@
+import $ from 'jquery';
+import { canScroll, isScrolledToBottom, toggleDisableButton } from './scroll_utils';
+
+export default class LogOutputBehaviours {
+  constructor() {
+    // Scroll buttons
+    this.$scrollTopBtn = $('.js-scroll-up');
+    this.$scrollBottomBtn = $('.js-scroll-down');
+
+    this.$scrollTopBtn.off('click').on('click', this.scrollToTop.bind(this));
+    this.$scrollBottomBtn.off('click').on('click', this.scrollToBottom.bind(this));
+  }
+
+  toggleScroll() {
+    const $document = $(document);
+    const currentPosition = $document.scrollTop();
+    const scrollHeight = $document.height();
+
+    const windowHeight = $(window).height();
+    if (canScroll()) {
+      if (currentPosition > 0 && scrollHeight - currentPosition !== windowHeight) {
+        // User is in the middle of the log
+
+        toggleDisableButton(this.$scrollTopBtn, false);
+        toggleDisableButton(this.$scrollBottomBtn, false);
+      } else if (currentPosition === 0) {
+        // User is at Top of  Log
+
+        toggleDisableButton(this.$scrollTopBtn, true);
+        toggleDisableButton(this.$scrollBottomBtn, false);
+      } else if (isScrolledToBottom()) {
+        // User is at the bottom of the build log.
+
+        toggleDisableButton(this.$scrollTopBtn, false);
+        toggleDisableButton(this.$scrollBottomBtn, true);
+      }
+    } else {
+      toggleDisableButton(this.$scrollTopBtn, true);
+      toggleDisableButton(this.$scrollBottomBtn, true);
+    }
+  }
+
+  toggleScrollAnimation(toggle) {
+    this.$scrollBottomBtn.toggleClass('animate', toggle);
+  }
+}