adding basic modal system

assets/Scripts/Services/ModalWindowSystem/ModalWindow.ts

@@ -0,0 +1,21 @@
+import { Component } from "cc";
+import { delay } from "../Utils/AsyncUtils";
+
+export abstract class ModalWindow<TParam, TResult> extends Component {
+    private result: TResult;
+    private isDismissed = false;
+
+    public async runAsync(params?: TParam): Promise<TResult> {
+        this.setup(params);
+        while (!this.isDismissed) await delay(100);
+
+        return this.result;
+    }
+
+    protected abstract setup(params?: TParam): void;
+
+    protected dismiss(result?: TResult): void {
+        this.result = result;
+        this.isDismissed = true;
+    }
+}