preact-responder-event-plugin
v1.0.16
Published
a library combine react-native-web and preact together
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preact-responder-event-plugin
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
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
LICENSE
MIT