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react-prismazoom
Advanced tools
A pan and zoom component for React, using CSS transformations.
Depends only upon prop-types, react and react-dom modules.
Works on both desktop and mobile.
Online demo here!
If you want to contribute, feel free to send a merge request or open a discussion. Currently, I just have time to maintain the package, but not enough to make big changes or add important features.
All contribution would be quite appreciated! 😉
Among changes I would like to apply:
locked
prop has been replaced by allowZoom
and allowPan
to handle zooming and panning events separatelyscrollVelocity
property passed to the component in order to keep the same effect.$ npm i -D react-prismazoom
This project includes a full-featured application demo.
First clone the project.
Go to the subfolder:
$ cd demo
Then, install it:
$ npm ci
Run the Webpack Dev Server:
$ npm start
⚠️ There is no unit tests anymore, since the previously used library is deprecated and doesn't support React 18. The current test suite need to be adapted using a different library.
import PrismaZoom from 'react-prismazoom'
<PrismaZoom>
<img src="my-image.png" />
<p>A text that can be zoomed and dragged</p>
</PrismaZoom>
Name | Type | Default | Description |
---|---|---|---|
className | string | None | Class name to apply on the zoom wrapper. |
style | object | None | Style to apply on the zoom wrapper. Note that transform, transition, cursor, touch-action and will-change cannot be overridden. Example: style={{backgroundColor: 'red'}} . |
minZoom | number | 1 | Minimum zoom ratio. |
maxZoom | number | 5 | Maximum zoom ratio. |
scrollVelocity | number | 0.1 | Zoom increment or decrement on each scroll wheel detection. |
onZoomChange | function | null | Function called each time the zoom value changes. |
onPanChange | function | null | Function called each time the posX or posY value changes (aka images was panned). |
animDuration | number | 0.25 | Animation duration (in seconds). |
doubleTouchMaxDelay | number | 300 | Max delay between two taps to consider a double tap (in milliseconds). |
decelerationDuration | number | 750 | Decelerating movement duration after a mouse up or a touch end event (in milliseconds). |
allowZoom | boolean | true | Enable or disable zooming in place. |
allowPan | boolean | true | Enable or disable panning in place. |
allowTouchEvents | boolean | false | Enables touch event propagation. |
Note: all props are optional.
These functions can be called from parent components.
zoomIn (value)
Increments the zoom with the given value.
Param {value: Number} : Zoom value
zoomOut (value)
Decrements the zoom with the given value.
Param {value: Number} : Zoom value
zoomToZone (relX, relY, relWidth, relHeight)
Zoom-in on the specified zone with the given relative coordinates and dimensions.
Param {relX: Number} : Relative X position of the zone left-top corner in pixels
Param {relY: Number} : Relative Y position of the zone left-top corner in pixels
Param {relWidth: Number} : Zone width in pixels
Param {relHeight: Number} : Zone height in pixels
reset ()
Resets the component to its initial state.
getZoom ()
Returns the current zoom value.
Return {Number} : Zone value
React PrismaZoom is licensed under the ISC license. See the LICENSE.md file for more details.
[3.0.3] - 2022-05-08
FAQs
A pan and zoom component for React, using CSS transformations.
The npm package react-prismazoom receives a total of 9,729 weekly downloads. As such, react-prismazoom popularity was classified as popular.
We found that react-prismazoom demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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