Move quick menu click listener registration to class for...

...global use

#417

srcjs/stendhal/ui/quickmenu/QuickMenuButton.ts

@@ -14,6 +14,7 @@ declare var stendhal: any;
 import { Component } from "../toolkit/Component";
 import { ui } from "../UI";
 import { Paths } from "../../data/Paths";
+import { ElementClickHandler } from "../../util/ElementClickHandler";
 
 
 /**
@@ -48,34 +49,10 @@ export abstract class QuickMenuButton extends Component {
 		(this.componentElement as HTMLImageElement).src = Paths.gui + "/quickmenu/" + id + ".png";
 		this.componentElement.style["cursor"] = "url(" + Paths.sprites + "/cursor/highlight.png) 1 3, auto";
 		this.componentElement.draggable = false;
+
 		// listen for click events
-		this.componentElement.addEventListener("mousedown", (evt: MouseEvent) => {
-			evt.preventDefault();
-			if (evt.button == 0) {
-				this.clickEngaged = true;
-			}
-		});
-		this.componentElement.addEventListener("touchstart", (evt: TouchEvent) => {
-			evt.preventDefault();
-			this.touchEngaged = evt.changedTouches.length;
-		});
-		this.componentElement.addEventListener("mouseup", (evt: MouseEvent) => {
-			evt.preventDefault();
-			if (this.clickEngaged && evt.button == 0) {
-				// FIXME: should veto if moved too much before release
-				this.onClick(evt);
-			}
-			this.clickEngaged = false;
-		});
-		this.componentElement.addEventListener("touchend", (evt: TouchEvent) => {
-			evt.preventDefault();
-			const target = stendhal.ui.html.extractTarget(evt, this.touchEngaged - 1);
-			if (this.touchEngaged == evt.changedTouches.length && target == this.componentElement) {
-				// FIXME: should veto if moved too much before release
-				this.onClick(evt);
-			}
-			this.touchEngaged = 0;
-		});
+		// FIXME: do we need to store this value for potential cleanup?
+		new ElementClickHandler(this.componentElement).onClick = this.onClick;
 		this.update();
 	}
 

srcjs/stendhal/util/ElementClickHandler.ts

@@ -0,0 +1,61 @@
+/***************************************************************************
+ *                    Copyright © 2024 - Faiumoni e. V.                    *
+ ***************************************************************************
+ ***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU Affero General Public License as        *
+ *   published by the Free Software Foundation; either version 3 of the    *
+ *   License, or (at your option) any later version.                       *
+ *                                                                         *
+ ***************************************************************************/
+
+declare var stendhal: any;
+
+
+/**
+ * Adds event listeners to handle clicks & multiple touches.
+ *
+ * TODO: add support long & double click/touch
+ */
+export class ElementClickHandler {
+
+	/** Function executed when click is detected. */
+	public onClick?: Function;
+	/** Property denoting button was pressed with mouse click. */
+	private clickEngaged = false;
+	/** Property denoting button was pressed with tap/touch. */
+	private touchEngaged = 0;
+
+
+	constructor(element: HTMLElement) {
+		// add supported listeners
+		element.addEventListener("mousedown", (evt: MouseEvent) => {
+			evt.preventDefault();
+			if (evt.button == 0) {
+				this.clickEngaged = true;
+			}
+		});
+		element.addEventListener("touchstart", (evt: TouchEvent) => {
+			evt.preventDefault();
+			this.touchEngaged = evt.changedTouches.length;
+		});
+		element.addEventListener("mouseup", (evt: MouseEvent) => {
+			evt.preventDefault();
+			if (this.clickEngaged && evt.button == 0 && this.onClick) {
+				// FIXME: should veto if moved too much before release
+				this.onClick(evt);
+			}
+			this.clickEngaged = false;
+		});
+		element.addEventListener("touchend", (evt: TouchEvent) => {
+			evt.preventDefault();
+			const target = stendhal.ui.html.extractTarget(evt, this.touchEngaged - 1);
+			if (this.touchEngaged == evt.changedTouches.length && target == element && this.onClick) {
+				// FIXME: should veto if moved too much before release
+				this.onClick(evt);
+			}
+			this.touchEngaged = 0;
+		});
+	}
+}