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Show Cases

Zoom while sliding

3.gif

Intelligent zoom

2.gif

Getting Started

Installation

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

Basic Usage

  • Install create-react-native-app first
$ npm install -g create-react-native-app
  • Initialization of a react-native project
$ create-react-native-app AwesomeProject
  • Then, edit AwesomeProject/App.js, like this:
import { Image, Dimensions } from 'react-native';
import ImageZoom from 'react-native-image-pan-zoom';

export default class App extends React.Component {
    render: function() {
        return (
            <ImageZoom cropWidth={Dimensions.get('window').width}
                       cropHeight={Dimensions.get('window').height}
                       imageWidth={200}
                       imageHeight={200}>
                <Image style={{width:200, height:200}}
                       source={{uri:'http://v1.qzone.cc/avatar/201407/07/00/24/53b9782c444ca987.jpg!200x200.jpg'}}/>
            </ImageZoom>
        )
    }
}

Document

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
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 }

Development pattern

Step 1, run TS listener

After clone this repo, then:

npm install
npm start

Step 2, run demo

cd demo
npm install
npm start

Then, scan the QR, use your expo app.