1 files changed, 39 insertions, 0 deletions
diff --git a/devtools/client/webconsole/new-console-output/reducers/ui.js b/devtools/client/webconsole/new-console-output/reducers/ui.js
new file mode 100644
index 000000000..aa91dceeb
--- /dev/null
+++ b/devtools/client/webconsole/new-console-output/reducers/ui.js
@@ -0,0 +1,39 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+const {
+  FILTER_BAR_TOGGLE,
+  MESSAGE_ADD,
+} = require("devtools/client/webconsole/new-console-output/constants");
+const Immutable = require("devtools/client/shared/vendor/immutable");
+
+const UiState = Immutable.Record({
+  filterBarVisible: false,
+  filteredMessageVisible: false,
+  autoscroll: true,
+});
+
+function ui(state = new UiState(), action) {
+  // Autoscroll should be set for all action types. If the last action was not message
+  // add, then turn it off. This prevents us from scrolling after someone toggles a
+  // filter, or to the bottom of the attachement when an expandable message at the bottom
+  // of the list is expanded. It does depend on the MESSAGE_ADD action being the last in
+  // its batch, though.
+  state = state.set("autoscroll", action.type == MESSAGE_ADD);
+
+  switch (action.type) {
+    case FILTER_BAR_TOGGLE:
+      return state.set("filterBarVisible", !state.filterBarVisible);
+  }
+
+  return state;
+}
+
+module.exports = {
+  UiState,
+  ui,
+};