Add focus regex for heapprofiles
Plumb a regex for filtering which slices appear in the flamechart.
Also fix a bug where clicking on the UI at top of the flamechart
reset slice selection.
Bug: 149833691
Change-Id: I777e7764616afbf80cfceb5a6980b6dc9679b88e
diff --git a/ui/src/frontend/rate_limiters.ts b/ui/src/frontend/rate_limiters.ts
new file mode 100644
index 0000000..ae212d4
--- /dev/null
+++ b/ui/src/frontend/rate_limiters.ts
@@ -0,0 +1,43 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Returns a wrapper around |f| which calls f at most once every |ms|ms.
+export function ratelimit(f: Function, ms: number): Function {
+ let inProgess = false;
+ return () => {
+ if (inProgess) {
+ return;
+ }
+ inProgess = true;
+ window.setTimeout(() => {
+ f();
+ inProgess = false;
+ }, ms);
+ };
+}
+
+// Returns a wrapper around |f| which waits for a |ms|ms pause in calls
+// before calling |f|.
+export function debounce(f: Function, ms: number): Function {
+ let timerId: undefined|number;
+ return () => {
+ if (timerId) {
+ window.clearTimeout(timerId);
+ }
+ timerId = window.setTimeout(() => {
+ f();
+ timerId = undefined;
+ }, ms);
+ };
+}
