Event: Remove fixHooks, propHooks; switch to ES5 getter with addProp

Fixes gh-3103
Fixes gh-1746
Closes gh-2860

- Removes the copy loop in jQuery.event.fix
- Avoids accessing properties such as client/offset/page/screen X/Y
  which may cause style recalc or layouts
- Simplifies adding property hooks to event object

1 files changed, 7 insertions, 15 deletions

diff --git a/test/unit/event.js b/test/unit/event.js
index 5b00c7c3b..236214730 100644
--- a/test/unit/event.js
+++ b/test/unit/event.js
@@ -2410,36 +2410,28 @@ QUnit.test( "event object properties on natively-triggered event", function( ass
 	$link.off( "click" ).remove();
 } );
 
-QUnit.test( "fixHooks extensions", function( assert ) {
+QUnit.test( "addProp extensions", function( assert ) {
 	assert.expect( 2 );
 
-	// IE requires focusable elements to be visible, so append to body
-	var $fixture = jQuery( "<input type='text' id='hook-fixture' />" ).appendTo( "body" ),
-		saved = jQuery.event.fixHooks.click;
+	var $fixture = jQuery( "<div>" ).appendTo( "#qunit-fixture" );
 
 	// Ensure the property doesn't exist
 	$fixture.on( "click", function( event ) {
-		assert.ok( !( "blurrinessLevel" in event ), "event.blurrinessLevel does not exist" );
+		assert.ok( !( "testProperty" in event ), "event.testProperty does not exist" );
 	} );
 	fireNative( $fixture[ 0 ], "click" );
 	$fixture.off( "click" );
 
-	jQuery.event.fixHooks.click = {
-		filter: function( event ) {
-			event.blurrinessLevel = 42;
-			return event;
-		}
-	};
+	jQuery.event.addProp( "testProperty", function() { return 42; } );
 
 	// Trigger a native click and ensure the property is set
 	$fixture.on( "click", function( event ) {
-		assert.equal( event.blurrinessLevel, 42, "event.blurrinessLevel was set" );
+		assert.equal( event.testProperty, 42, "event.testProperty getter was invoked" );
 	} );
 	fireNative( $fixture[ 0 ], "click" );
+	$fixture.off( "click" );
 
-	delete jQuery.event.fixHooks.click;
-	$fixture.off( "click" ).remove();
-	jQuery.event.fixHooks.click = saved;
+	$fixture.remove();
 } );
 
 QUnit.test( "drag/drop events copy mouse-related event properties (gh-1925, gh-2009)", function( assert ) {