Class: ScrollWatcher

ScrollWatcher(targetopt)

Scroll event watcher for smooth animation.

Name	Type	Default	Description
`target`opt	Element	`window`	Element to watch

Author:: Satoshi Soma (amekusa.com)
License:: Apache-2.0
Copyright 2020 Satoshi Soma

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Source:: src/scripts/ScrollWatcher.js, line 22

Registers a callback.

Name	Type	Description
`ev`	string string[]	Event name(s). Pass `any` to register to all the available events
`fn`	function	Callback

let sw.on('scroll', ev => {
  console.log('Scroll Detected');
});

Starts watching scroll related events.

Name	Type	Default	Description
`ev`	string string[]	`any`	Event name(s) to watch. `any` to watch all the available events