react native web image pan zoom
npm install react-native-web-image-pan-zoom> Zoom while sliding
> Intelligent zoom
``bash`
npm i react-native-image-pan-zoom --save
- Install create-react-native-app first
`bash`
$ npm install -g create-react-native-app
- Initialization of a react-native project
`bash`
$ create-react-native-app AwesomeProject
- Then, edit AwesomeProject/App.js, like this:
`typescript
import { Image, Dimensions } from 'react-native';
import ImageZoom from 'react-native-image-pan-zoom';
export default class App extends React.Component {
render: function() {
return (
imageWidth={200}
imageHeight={200}>
)
}
}
`
| Props | Type | Description | DefaultValue |
| -------------------------- | -------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------ |
| cropWidth(required) | number | operating area width | 100 |
| cropHeight(required) | number | operating area height | 100 |
| imageWidth(required) | number | picture width | 100 |
| imageHeight(required) | number | picture height | 100 |
| onClick | (eventParams: IOnClick)=>void | onClick | ()=>{} |
| panToMove | boolean | allow to move picture with one finger | true |
| pinchToZoom | boolean | allow scale with two fingers | true |
| clickDistance | number | how many finger movement can also trigger onClick | 10 |
| horizontalOuterRangeOffset | (offsetX?: number)=>void | horizontal beyond the distance, the parent to do picture switching, you can listen to this function. When this function is triggered, you can do the switch operation | ()=>{} |
| onDragLeft | ()=>void | trigger to switch to the left of the graph, the left sliding speed exceeds the threshold when triggered | ()=>{} |
| responderRelease | (vx: number)=>void | let go but do not cancel | ()=>{} |
| maxOverflow | number | maximum sliding threshold | 100 |
| longPressTime | number | long press threshold | 800 |
| onLongPress | ()=>void | on longPress | ()=> {} |
| doubleClickInterval | number | time allocated for second click to be considered as doublClick event | 175 |
| onMove | ( position: IOnMove )=>void | reports movement position data (helpful to build overlays) | ()=> {} |
| centerOn | { x: number, y: number, scale: number, duration: number } | if given this will cause the map to pan and zoom to the desired location | undefined |
| enableSwipeDown | boolean | for enabling vertical movement if user doesn't want it | false | | false |
| enableCenterFocus | boolean | for disabling focus on image center if user doesn't want it | true |
| onSwipeDown | () => void | function that fires when user swipes down | null |
| swipeDownThreshold | number | threshold for firing swipe down function | 230 |
| minScale | number | minimum zoom scale | 0.6 |
| maxScale | number | maximum zoom scale | 10 |
| Method | params | Description |
| ---------- | --------- | ---------------------------------------------------------------------------------------------------------------- |
| reset | | Reset the position and the scale of the image |
| resetScale | | Reset the scale of the image |
| centerOn | ICenterOn | Centers the image in the position indicated. ICenterOn={ x: number, y: number, scale: number, duration: number } |
After clone this repo, then:
`bash`
npm install
npm start
`bash``
cd demo
npm install
npm start
Then, scan the QR, use your expo app.