1 files changed, 46 insertions, 0 deletions
diff --git a/src/client/views/OverlayView.tsx b/src/client/views/OverlayView.tsx
new file mode 100644
index 000000000..72f1068ce
--- /dev/null
+++ b/src/client/views/OverlayView.tsx
@@ -0,0 +1,46 @@
+import * as React from "react";
+import { observer } from "mobx-react";
+import { observable, action } from "mobx";
+
+export type OverlayDisposer = () => void;
+
+export type OverlayElementOptions = {
+    x: number;
+    y: number;
+    width?: number;
+    height?: number;
+};
+
+@observer
+export class OverlayView extends React.Component {
+    public static Instance: OverlayView;
+    @observable.shallow
+    private _elements: { ele: JSX.Element, options: OverlayElementOptions }[] = [];
+
+    constructor(props: any) {
+        super(props);
+        if (!OverlayView.Instance) {
+            OverlayView.Instance = this;
+        }
+    }
+
+    @action
+    addElement(ele: JSX.Element, options: OverlayElementOptions): OverlayDisposer {
+        const eleWithPosition = { ele, options };
+        this._elements.push(eleWithPosition);
+        return action(() => {
+            const index = this._elements.indexOf(eleWithPosition);
+            if (index !== -1) this._elements.splice(index, 1);
+        });
+    }
+
+    render() {
+        return (
+            <div>
+                {this._elements.map(({ ele, options: { x, y, width, height } }) => (
+                    <div style={{ position: "absolute", transform: `translate(${x}px, ${y}px)`, width, height }}>{ele}</div>
+                ))}
+            </div>
+        );
+    }
+}
+\ No newline at end of file