From 48aa0b5b03fe1d3c3103a79baea2e81d5faadbd2 Mon Sep 17 00:00:00 2001
From: Fabio Alessandrelli <fabio.alessandrelli@gmail.com>
Date: Thu, 6 Aug 2020 15:43:01 +0200
Subject: Small refactor to JavaScript handlers.

Crated helper class in native/utils.js.
Simplify code in OS/DisplayServer.
---
 platform/javascript/native/utils.js | 41 +++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

(limited to 'platform/javascript/native')

diff --git a/platform/javascript/native/utils.js b/platform/javascript/native/utils.js
index 95585d26ae..18f041fd63 100644
--- a/platform/javascript/native/utils.js
+++ b/platform/javascript/native/utils.js
@@ -202,3 +202,44 @@ Module.drop_handler = (function() {
 		});
 	}
 })();
+
+function EventHandlers() {
+	function Handler(target, event, method, capture) {
+		this.target = target;
+		this.event = event;
+		this.method = method;
+		this.capture = capture;
+	}
+
+	var listeners = [];
+
+	function has(target, event, method, capture) {
+		return listeners.findIndex(function(e) {
+			return e.target === target && e.event === event && e.method === method && e.capture == capture;
+		}) !== -1;
+	}
+
+	this.add = function(target, event, method, capture) {
+		if (has(target, event, method, capture)) {
+			return;
+		}
+		listeners.push(new Handler(target, event, method, capture));
+		target.addEventListener(event, method, capture);
+	};
+
+	this.remove = function(target, event, method, capture) {
+		if (!has(target, event, method, capture)) {
+			return;
+		}
+		target.removeEventListener(event, method, capture);
+	};
+
+	this.clear = function() {
+		listeners.forEach(function(h) {
+			h.target.removeEventListener(h.event, h.method, h.capture);
+		});
+		listeners.length = 0;
+	};
+}
+
+Module.listeners = new EventHandlers();
-- 
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