react-native-image-pan-zoom

Show Cases


> Zoom while sliding

!3.gif

> Intelligent zoom

!2.gif

Getting Started

$3

``bash
npm i react-native-image-pan-zoom --save
`

$3

- 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 (
cropHeight={Dimensions.get('window').height}
imageWidth={200}
imageHeight={200}>
source={{uri:'http://v1.qzone.cc/avatar/201407/07/00/24/53b9782c444ca987.jpg!200x200.jpg'}}/>

)
}
}
`

$3

| 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 | ()=>{} |
| onDoubleClick | (eventParams: IOnClick)=>void | onDoubleClick | ()=>{} |
| 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 | (eventParams: IOnClick)=>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 |
| 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 |
| useNativeDriver | boolean | Whether to animate using useNativeDriver | false |
| onStartShouldSetPanResponder | () => boolean | Override onStartShouldSetPanResponder behavior | () => true |
| onMoveShouldSetPanResponder | () => boolean | Override onMoveShouldSetPanResponder behavior | undefined |
| onPanResponderTerminationRequest | () => boolean | Override onMoveShouldSetPanResponder behavior | () => false |
| useHardwareTextureAndroid | boolean | for disabling rendering to hardware texture on Android | true |

| 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 } |

Development pattern

$3

After clone this repo, then:

`bash
npm install
npm start
`

$3

`bash
cd demo
npm install
npm start
``

Then, scan the QR, use your expo app.

Contributors ✨

Thanks goes to these wonderful people (emoji key):

Darius 💻

Thomas P. 💻

Juan Di Toro 💻

Alhaytham Elhassan 💻

Alexander Pataridze 💻

Peter Xu 💻

This project follows the all-contributors specification. Contributions of any kind welcome!