Add support for passive event listeners

Author: summercms

src/jquery.mousewheel.js

@@ -36,15 +36,43 @@
 		version: "@VERSION",
 
 		setup: function() {
-			this.addEventListener( "wheel", handler, false );
+		// Use passive event listeners if supported
+		var passiveSupported = false;
+		try {
+			var opts = Object.defineProperty({}, "passive", {
+				get: function() {
+					passiveSupported = true;
+				}
+			});
+			window.addEventListener("test", null, opts);
+		} catch (e) {}
+		this.addEventListener(
+			"wheel",
+			handler,
+			passiveSupported ? { passive: true } : false
+		);
 
 			// Store the line height and page height for this particular element
 			$.data( this, "mousewheel-line-height", special.getLineHeight( this ) );
 			$.data( this, "mousewheel-page-height", special.getPageHeight( this ) );
 		},
 
 		teardown: function() {
-			this.removeEventListener( "wheel", handler, false );
+		// Remove with same passive option as setup
+		var passiveSupported = false;
+		try {
+			var opts = Object.defineProperty({}, "passive", {
+				get: function() {
+					passiveSupported = true;
+				}
+			});
+			window.addEventListener("test", null, opts);
+		} catch (e) {}
+		this.removeEventListener(
+			"wheel",
+			handler,
+			passiveSupported ? { passive: true } : false
+		);
 
 			// Clean up the data we added to the element
 			$.removeData( this, "mousewheel-line-height" );