a button to repaint

ui/button.js

@@ -0,0 +1,31 @@
+class Button {
+    constructor(image) {
+        this.element = document.createElement("button");
+        this.element.style.backgroundImage = "url(images/" + image + ".svg)";
+        this._boundClick = this._onClick.bind(this);
+        this.element.addEventListener("click", this._boundClick, false);
+        this._handlers = [];
+    }
+    destructor() {
+        this.element.removeEventListener("click", this._boundClick);
+        delete this._boundClick;
+        delete this._handlers;
+        delete this.element;
+    }
+    addHandler(handler) {
+        this._handlers.push(handler);
+    }
+    setPosition(x, y) {
+        this.element.style.position = "absolute";
+        this.element.style.top = y + "px";
+        this.element.style.left = x + "px";
+    }
+    _onClick(e) {
+        for (let i = 0; i < this._handlers.length; ++i) {
+            this._handlers[i](e);
+        }
+    }
+
+}
+
+export default Button;