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preact-responder-event-plugin

v1.0.16

Published

a library combine react-native-web and preact together

Downloads

12

Readme

preact-responder-event-plugin

HitCount

This library implement the react native's Gesture Responder System which is required by react-native-web.

It brings the preact and react-native-web together like what react-dom does for react and react-native-web. Now you can build a react native app into web app by using preact.

It's 3KB after compressed, no need to worry about the size.

Installation

It depends on preact 10 and react-native-web, so you need to install them too.

npm i preact-responder-event-plugin react-native-web preact@next

or

yarn add preact-responder-event-plugin react-native-web preact@next

Usage

All you need to do is add some aliases in your webpack config to replace the react-native, react, react-dom implicitly.

  resolve: {
    alias: {
      "react-native$": "react-native-web/dist/index.js",
      react$: "preact/compat",
      "react-dom$": "preact/compat",
      "react-dom/unstable-native-dependencies$": "preact-responder-event-plugin",
    },
  },

Try it

example

How it works

The plugin will listen to some events like touchstart, touchmove at document node like the react do.

It will find those views which want to be the responder(if a view has an onStartShouldSetResponder or onMoveShouldSetResponder property) and pick the first one to be the responder when start or move events being triggered

If another view, like a parent view, also wants to be a responder. the plugin will call responder's onResponderTerminationRequest to ask if it allows the request. if it returns true, the responder will be transferred to another view.

If it's a multi-finger touch, the responder view's onTouchEnd will be called when the touchend event is fired and when the event.touches becames zero, onResponderRelease will be called.

On desktop platform, a mouse event will transform to a touch event and it will be treated like a single-finger event.

Here is a graph in ResponderEventPlugin that describes the whole process.

                                               Negotiation Performed
                                             +-----------------------+
                                            /                         \
Process low level events to    +     Current Responder      +   wantsResponderID
determine who to perform negot-|   (if any exists at all)   |
iation/transition              | Otherwise just pass through|
-------------------------------+----------------------------+------------------+
Bubble to find first ID        |                            |
to return true:wantsResponderID|                            |
                               |                            |
     +-------------+           |                            |
     | onTouchStart|           |                            |
     +------+------+     none  |                            |
            |            return|                            |
+-----------v-------------+true| +------------------------+ |
|onStartShouldSetResponder|----->|onResponderStart (cur)  |<-----------+
+-----------+-------------+    | +------------------------+ |          |
            |                  |                            | +--------+-------+
            | returned true for|       false:REJECT +-------->|onResponderReject
            | wantsResponderID |                    |       | +----------------+
            | (now attempt     | +------------------+-----+ |
            |  handoff)        | |   onResponder          | |
            +------------------->|      TerminationRequest| |
                               | +------------------+-----+ |
                               |                    |       | +----------------+
                               |         true:GRANT +-------->|onResponderGrant|
                               |                            | +--------+-------+
                               | +------------------------+ |          |
                               | |   onResponderTerminate |<-----------+
                               | +------------------+-----+ |
                               |                    |       | +----------------+
                               |                    +-------->|onResponderStart|
                               |                            | +----------------+
Bubble to find first ID        |                            |
to return true:wantsResponderID|                            |
                               |                            |
     +-------------+           |                            |
     | onTouchMove |           |                            |
     +------+------+     none  |                            |
            |            return|                            |
+-----------v-------------+true| +------------------------+ |
|onMoveShouldSetResponder |----->|onResponderMove (cur)   |<-----------+
+-----------+-------------+    | +------------------------+ |          |
            |                  |                            | +--------+-------+
            | returned true for|       false:REJECT +-------->|onResponderRejec|
            | wantsResponderID |                    |       | +----------------+
            | (now attempt     | +------------------+-----+ |
            |  handoff)        | |   onResponder          | |
            +------------------->|      TerminationRequest| |
                               | +------------------+-----+ |
                               |                    |       | +----------------+
                               |         true:GRANT +-------->|onResponderGrant|
                               |                            | +--------+-------+
                               | +------------------------+ |          |
                               | |   onResponderTerminate |<-----------+
                               | +------------------+-----+ |
                               |                    |       | +----------------+
                               |                    +-------->|onResponderMove |
                               |                            | +----------------+
                               |                            |
                               |                            |
      Some active touch started|                            |
      inside current responder | +------------------------+ |
      +------------------------->|      onResponderEnd    | |
      |                        | +------------------------+ |
  +---+---------+              |                            |
  | onTouchEnd  |              |                            |
  +---+---------+              |                            |
      |                        | +------------------------+ |
      +------------------------->|     onResponderEnd     | |
      No active touches started| +-----------+------------+ |
      inside current responder |             |              |
                               |             v              |
                               | +------------------------+ |
                               | |    onResponderRelease  | |
                               | +------------------------+ |
                               |                            |
                               +                            +

CHANGELOG

CHANGELOG

LICENSE

MIT