Show Cases

Zoom while sliding

Intelligent zoom

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 | | 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 | | onStartShouldSetPanResponder | () => boolean | Override onStartShouldSetPanResponder behavior | () => true | | onMoveShouldSetPanResponder | () => boolean | Override onMoveShouldSetPanResponder behavior | undefined | | onPanResponderTerminationRequest | () => boolean | Override onMoveShouldSetPanResponder behavior | () => false |

| 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.