function fadeOut()

in AKS-Demos/WordPress-Demo/Code/public/wp-admin/js/editor-expand.js [1167:1295]
97 lines of code
54 McCabe index (conditional complexity)

		function fadeOut( event ) {
			var isMac,
				key = event && event.keyCode;

			if ( window.navigator.platform ) {
				isMac = ( window.navigator.platform.indexOf( 'Mac' ) > -1 );
			}

			// Fade in and returns on Escape and keyboard shortcut Alt+Shift+W and Ctrl+Opt+W.
			if ( key === 27 || ( key === 87 && event.altKey && ( ( ! isMac && event.shiftKey ) || ( isMac && event.ctrlKey ) ) ) ) {
				fadeIn( event );
				return;
			}

			// Return if any of the following keys or combinations of keys is pressed.
			if ( event && ( event.metaKey || ( event.ctrlKey && ! event.altKey ) || ( event.altKey && event.shiftKey ) || ( key && (
				// Special keys ( tab, ctrl, alt, esc, arrow keys... ).
				( key <= 47 && key !== 8 && key !== 13 && key !== 32 && key !== 46 ) ||
				// Windows keys.
				( key >= 91 && key <= 93 ) ||
				// F keys.
				( key >= 112 && key <= 135 ) ||
				// Num Lock, Scroll Lock, OEM.
				( key >= 144 && key <= 150 ) ||
				// OEM or non-printable.
				key >= 224
			) ) ) ) {
				return;
			}

			if ( ! faded ) {
				faded = true;

				clearTimeout( overlayTimer );

				overlayTimer = setTimeout( function() {
					$overlay.show();
				}, 600 );

				$editor.css( 'z-index', 9998 );

				$overlay
					// Always recalculate the editor area when entering the overlay with the mouse.
					.on( 'mouseenter.focus', function() {
						recalcEditorRect();

						$window.on( 'scroll.focus', function() {
							var nScrollY = window.pageYOffset;

							if ( (
								scrollY && mouseY &&
								scrollY !== nScrollY
							) && (
								mouseY < editorRect.top - buffer ||
								mouseY > editorRect.bottom + buffer
							) ) {
								fadeIn();
							}

							scrollY = nScrollY;
						} );
					} )
					.on( 'mouseleave.focus', function() {
						x = y =  null;
						traveledX = traveledY = 0;

						$window.off( 'scroll.focus' );
					} )
					// Fade in when the mouse moves away form the editor area.
					.on( 'mousemove.focus', function( event ) {
						var nx = event.clientX,
							ny = event.clientY,
							pageYOffset = window.pageYOffset,
							pageXOffset = window.pageXOffset;

						if ( x && y && ( nx !== x || ny !== y ) ) {
							if (
								( ny <= y && ny < editorRect.top - pageYOffset ) ||
								( ny >= y && ny > editorRect.bottom - pageYOffset ) ||
								( nx <= x && nx < editorRect.left - pageXOffset ) ||
								( nx >= x && nx > editorRect.right - pageXOffset )
							) {
								traveledX += Math.abs( x - nx );
								traveledY += Math.abs( y - ny );

								if ( (
									ny <= editorRect.top - buffer - pageYOffset ||
									ny >= editorRect.bottom + buffer - pageYOffset ||
									nx <= editorRect.left - buffer - pageXOffset ||
									nx >= editorRect.right + buffer - pageXOffset
								) && (
									traveledX > 10 ||
									traveledY > 10
								) ) {
									fadeIn();

									x = y =  null;
									traveledX = traveledY = 0;

									return;
								}
							} else {
								traveledX = traveledY = 0;
							}
						}

						x = nx;
						y = ny;
					} )

					// When the overlay is touched, fade in and cancel the event.
					.on( 'touchstart.focus', function( event ) {
						event.preventDefault();
						fadeIn();
					} );

				$editor.off( 'mouseenter.focus' );

				if ( focusLostTimer ) {
					clearTimeout( focusLostTimer );
					focusLostTimer = null;
				}

				$body.addClass( 'focus-on' ).removeClass( 'focus-off' );
			}

			fadeOutAdminBar();
			fadeOutSlug();
		}