1 files changed, 80 insertions, 0 deletions
diff --git a/devtools/client/netmonitor/src/actions/selection.js b/devtools/client/netmonitor/src/actions/selection.js
new file mode 100644
index 0000000000..4603fcb61c
--- /dev/null
+++ b/devtools/client/netmonitor/src/actions/selection.js
@@ -0,0 +1,80 @@
+/* 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 {
+  SELECT_REQUEST,
+} = require("resource://devtools/client/netmonitor/src/constants.js");
+const {
+  getDisplayedRequests,
+  getSortedRequests,
+} = require("resource://devtools/client/netmonitor/src/selectors/index.js");
+
+const PAGE_SIZE_ITEM_COUNT_RATIO = 5;
+
+/**
+ * Select request with a given id.
+ */
+function selectRequest(id, request) {
+  return {
+    type: SELECT_REQUEST,
+    id,
+    request,
+  };
+}
+
+/**
+ * Select request with a given index (sorted order)
+ */
+function selectRequestByIndex(index) {
+  return ({ dispatch, getState }) => {
+    const requests = getSortedRequests(getState());
+    let itemId;
+    if (index >= 0 && index < requests.length) {
+      itemId = requests[index].id;
+    }
+    dispatch(selectRequest(itemId));
+  };
+}
+
+/**
+ * Move the selection up to down according to the "delta" parameter. Possible values:
+ * - Number: positive or negative, move up or down by specified distance
+ * - "PAGE_UP" | "PAGE_DOWN" (String): page up or page down
+ * - +Infinity | -Infinity: move to the start or end of the list
+ */
+function selectDelta(delta) {
+  return ({ dispatch, getState }) => {
+    const state = getState();
+    const requests = getDisplayedRequests(state);
+
+    if (!requests.length) {
+      return;
+    }
+
+    const selIndex = requests.findIndex(
+      r => r.id === state.requests.selectedId
+    );
+
+    if (delta === "PAGE_DOWN") {
+      delta = Math.ceil(requests.length / PAGE_SIZE_ITEM_COUNT_RATIO);
+    } else if (delta === "PAGE_UP") {
+      delta = -Math.ceil(requests.length / PAGE_SIZE_ITEM_COUNT_RATIO);
+    }
+
+    const newIndex = Math.min(
+      Math.max(0, selIndex + delta),
+      requests.length - 1
+    );
+    const newItem = requests[newIndex];
+    dispatch(selectRequest(newItem.id, newItem));
+  };
+}
+
+module.exports = {
+  selectRequest,
+  selectRequestByIndex,
+  selectDelta,
+};