1 files changed, 46 insertions, 0 deletions
diff --git a/devtools/client/aboutdebugging/src/modules/debug-target-collapsibilities.js b/devtools/client/aboutdebugging/src/modules/debug-target-collapsibilities.js
new file mode 100644
index 0000000000..efba47e03a
--- /dev/null
+++ b/devtools/client/aboutdebugging/src/modules/debug-target-collapsibilities.js
@@ -0,0 +1,46 @@
+/* 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 PREF_PREFIX = "devtools.aboutdebugging.collapsibilities.";
+const {
+  DEBUG_TARGET_PANE,
+} = require("resource://devtools/client/aboutdebugging/src/constants.js");
+
+/**
+ * This module provides a collection of helper methods to read and update the debug
+ * target pane's collapsibilities.
+ */
+
+/**
+ * @return {Object}
+ *         {
+ *           key: constants.DEBUG_TARGET_PANE
+ *           value: true - collapsed
+ *                  false - expanded
+ *         }
+ */
+function getDebugTargetCollapsibilities() {
+  const map = new Map();
+
+  for (const key of Object.values(DEBUG_TARGET_PANE)) {
+    const pref = Services.prefs.getBoolPref(PREF_PREFIX + key, false);
+    map.set(key, pref);
+  }
+
+  return map;
+}
+exports.getDebugTargetCollapsibilities = getDebugTargetCollapsibilities;
+
+/**
+ * @param collapsibilities - Same format to getDebugTargetCollapsibilities.
+ */
+function setDebugTargetCollapsibilities(collapsibilities) {
+  for (const key of Object.values(DEBUG_TARGET_PANE)) {
+    const isCollapsed = collapsibilities.get(key);
+    Services.prefs.setBoolPref(PREF_PREFIX + key, isCollapsed);
+  }
+}
+exports.setDebugTargetCollapsibilities = setDebugTargetCollapsibilities;