fpoint

simple js lib to help you lift touch experience development cross browsers

Install

npm i -S fpoint

Usage

import { fscrub, ftap } from 'fpoint'

fscrub(document.querySelector('.slider'), {
  onStart() {},
  onMove() {},
  onEnd() {},
})

ftap(document.querySelector('.button'), {
  onTouchClick() {},
  onMouseClick() {},
  onHoverEnter() {},
  onHoverLeave() {},
})

fscrub

Convenient util for cross browser dragging/scrubbing experience

Why?

Different browsers have different support on touch experience, egde, chrome, safari have their own implementation of touch support and the events stack may not be expected on touchable devices. Especially sometimes we only want to do a simple scrub. Why can't the scrub action be easy as the click with mouse on desktop?

Let's see the observation on behavior of desktop devices + mouse and touchable devices + touch:

Browser & Action	PointerEvent	MouseEvent	TouchEvent
chrome + touch	✅	✅	✅
edge + touch	✅	✅	❌
safari + touch	❌	❌	✅
chrome + mouse	✅	✅	❌
edge + mouse	✅	✅	❌
safari + mouse	❌	✅	❌

Emmmmm......

Since chrome and edge both support PointerEvent, safari and chrome both support TouchEvent, edge on touch devices will fire mouse event but other dont', we cannot use any single event as we want. If we don't have PointerEvent polyfill on safari, it will ba hard to listen to scrub actions.

fscrub is used to resolve the diffculties and let you write less code.

Usage

<div class="scrub__baseline">
  <div class="scrub__head" />
</div>

fscrub(
  document.querySelector('.scrub__head'),
  {
    onStart() { ... },
    onMove() { ... },
    onEnd() { ... },
  },
  {
    mouse: false,
    touch: true,
    hover: true,
  }
)

API

fscrub(
  node: Node,
  {
    onStart: function(MouseEvent | PointerEvent | TouchEvent) {},
    onMove: function(MouseEvent | PointerEvent | TouchEvent) {},
    onEnd: function(MouseEvent | PointerEvent | TouchEvent) {},
  },
  { mouse: boolean, touch: boolean, hover: boolean }
)

Arguments

• node is the scrubble dom node you want to track the scrub moves.
• handles is an object. which may carry onStart, onMove and onEnd for different scrub phases.
• option is an object. option.mouse will enable triggering scrub events when playing with mouse, option.touch is for finger touch. if you specify option.hover to true, it will turn option.mouse to false. since the behavior have conflicts

Returns

A release function to let you unlisten the scrub actions of the node.

do what you need to do in the handlers onStart, onMove and onEnd to render changes of UI.

ftap

Cross-browser click / single touch / hover handler

unlike fscrub, ftap is just used to detect finger touch, mouse click and mouse hover. usually we need different experience between hover and touch. since with touch devices we don't have hover options, and ftap help you distinguish different input sources, make each interaction type easy to be monitored

Usage

ftap(domNode, {
  // for single touch
  onTouchDown(event) { /*...*/ },
  onTouchUp(event) { /*...*/ },
  onTouchClick(event) { /*...*/ },

  // for mouse click
  onMouseDown(event) { /*...*/ },
  onMouseUp(event) { /*...*/ },
  onMouseClick(event) { /*...*/ },

  // for mouse hover
  onHoverEnter(event) { /*...*/ },
  onHoverLeave(event) { /*...*/ },
})

the kind of event may be one of the input events (PointerEvent, TouchEvent, MouseEvent), depends on what really fired by browser.

Use with React

fpoint/react provides a set of react components make mouse & touching easier.

<Scurb>

Scrub component let you to easily attach handlers to track mouse dragging or finger scrubbing interactions. You could use it to build your custom slider, touch screen or any other advanced components you like.

Example

import { Scrub } from 'fpoint/react'

function handleScrubMove(e) {
  const pageX = e.touches ? e.touches[0].pageX : e.pageX
  const pageY = e.touches ? e.touches[0].pageY : e.pageY
  
  // ...
}

return (
  <Scrub
    onScrubMove={handleScrubMove}
  >
    {children}
  </Scrub>
)

Component Props

component?: string | ReactComponent
onScrubStart?(e?: Event): void;
onScrubMove?(e?: Event): void;
onScrubEnd?(e?: Event): void;
onHoverStart?(e?: Event): void;
onHoverMove?(e?: Event): void;
onHoverEnd?(e?: Event): void;

Other props will be directly applied onto it.

<Tap>

Tap component let you easily distinguish between touch and mouse clicks. Sometimes we're also struggling to separate mouse hover or touch enter among desktop and mobile devices. This component give you power to track every single phase during an complete interaction.

Example

import { Tap } from 'fpoint/react'

function handleTouchClick(e) {
  const {offsetX, offsetY} = e
  // ...
}

function handleMouseClick(e) {
  // ...
}

return (
  <Tap
    onTouchClick={handleTouchClick}
    onMouseClick={handleMouseClick}
  >
    {children}
  </Tap>
)

Component Props

component?: string | ReactComponent
onTouchDown?(e?: Event): void;
onTouchUp?(e?: Event): void;
onTouchClick?(e?: Event): void;
onMouseDown?(e?: Event): void;
onMouseUp?(e?: Event): void;
onMouseClick?(e?: Event): void;
onHoverEnter?(e?: Event): void;
onHoverLeave?(e?: Event): void;

Other props will be directly applied onto it.

Development

For main library

yarn
yarn build

For example pages

cd ./example
yarn
yarn start

LICENSE

MIT