build: separate module for frontend

This allows us to simplify the webpack configuration and the gradle
build scripts.

1 files changed, 33 insertions, 0 deletions

diff --git a/subprojects/frontend/src/utils/Timer.ts b/subprojects/frontend/src/utils/Timer.ts
new file mode 100644
index 00000000..8f653070
--- /dev/null
+++ b/subprojects/frontend/src/utils/Timer.ts
@@ -0,0 +1,33 @@
+export class Timer {
+  readonly callback: () => void;
+
+  readonly defaultTimeout: number;
+
+  timeout: number | null = null;
+
+  constructor(callback: () => void, defaultTimeout = 0) {
+    this.callback = () => {
+      this.timeout = null;
+      callback();
+    };
+    this.defaultTimeout = defaultTimeout;
+  }
+
+  schedule(timeout: number | null = null): void {
+    if (this.timeout === null) {
+      this.timeout = setTimeout(this.callback, timeout || this.defaultTimeout);
+    }
+  }
+
+  reschedule(timeout: number | null = null): void {
+    this.cancel();
+    this.schedule(timeout);
+  }
+
+  cancel(): void {
+    if (this.timeout !== null) {
+      clearTimeout(this.timeout);
+      this.timeout = null;
+    }
+  }
+}