@rescript-react-native/image-editor

ReScript bindings for @react-native-community/image-editor.

Exposed as ReactNativeImageEditor module.

@rescript-react-native/image-editor X.y.* means it's compatible with @react-native-community/image-editor X.y.*

Installation

When @react-native-community/image-editor is properly installed & configured by following their installation instructions, you can install the bindings:

npm install @rescript-react-native/image-editor
# or
yarn add @rescript-react-native/image-editor

@rescript-react-native/image-editor should be added to bs-dependencies in your bsconfig.json:

{
  //...
  "bs-dependencies": [
    "@rescript/react",
    "rescript-react-native",
    // ...
+    "@rescript-react-native/image-editor"
  ],
  //...
}

Methods

cropImage

cropImage takes arguments of type source and cropData and, if the image is successfully cropped, returns path of the resulting image as a string, wrapped in a Promise. If a remote image cannot be downloaded or an image cannot be cropped, the Promise will be rejected.

cropImage: (source, cropData) => Js.Promise.t(string)

fromRequired

To convert a ReactNative.Packager.required object into source.

fromRequired: ReactNative.Packager.required => source

fromUriSource

To convert a URI given as a string into source.

fromUriSource: string => source

Types

source

An abstract type created using the fromRequired and fromUriSource methods.

offset

An abstract type created using the constructor of the same name which takes named arguments x and y of type int.

offset: (~x: int, ~y: int) => offset

size

An abstract type created using the constructor of the same name which takes named arguments width and height of type int.

size: (~width: int, ~height: int) => size

cropData

An abstract type created using the constructor of the same name which takes named arguments offset (of type offset) and size (of type size) and optional arguments displaySize (of type size) and resizeMode (one of polymorphic variants `contain, `cover, `stretch).

cropData: (
  ~offset: offset,
  ~size: size,
  ~displaySize: size=?,
  ~resizeMode=[ | `contain | `cover | `stretch]=?,
  unit
) => cropData

Example

open ReactNative;

// hardcoding actual image dimensions
let imageWidth = 3396.;
let imageHeight = 2388.;

let windowWidth = Dimensions.get(`window)##width;
let windowHeight = Dimensions.get(`window)##height;

let displayWidth = windowWidth *. 0.9;
let displayHeight = windowWidth *. 0.9 *. imageHeight /. imageWidth;

let styles =
  Style.(
    StyleSheet.create({
      "container":
        style(
          ~width=windowWidth->dp,
          ~height=windowHeight->dp,
          ~flexDirection=`column,
          ~alignItems=`center,
          ~justifyContent=`center,
          (),
        ),
      "frame":
        style(
          ~width=displayWidth->dp,
          ~height=displayHeight->dp,
          ~alignItems=`center,
          ~justifyContent=`center,
          ~borderWidth=StyleSheet.hairlineWidth,
          (),
        ),
    })
  );

type state = {
  path: option(string),
  imageLoaded: bool,
};

type action =
  | SetPath(option(string))
  | SetImageLoaded;

let imageUri = "https://images.unsplash.com/photo-1520453803296-c39eabe2dab4";
let uri = ReactNativeImageEditor.fromUriSource(imageUri);

let handleCropImage = (cropData, send, handler) =>
	Js.Promise.(
		ReactNativeImageEditor.cropImage(uri, cropData)
		|> then_(successURI => resolve(send(handler(successURI))))
    |> catch(err => resolve(Js.Console.warn(err)))
    |> ignore
  );

[@react.component]
let make = () => {
  let (state, dispatch) =
    React.useReducer(
      (state, action) =>
        switch (action) {
        | SetPath(p) => {...state, path: p}
        | SetImageLoaded => {...state, imageLoaded: true}
        },
      {path: None, imageLoaded: false},
    );

  let size =
    ReactNativeImageEditor.size(
      ~width=(imageWidth *. 0.5)->floor->truncate,
      ~height=(imageHeight *. 0.5)->floor->truncate,
    );

  let cropData = offset =>
    ReactNativeImageEditor.cropData(
      ~offset,
      ~size,
      ~resizeMode=`cover,
      (),
    );

  <View style=styles##container>
      <Text>
        "Click on a quadrant of the image to crop it."->React.string
      </Text>
      <View style=styles##frame>
        <TouchableOpacity
          onPress={e =>
            handleCropImage(
              ReactNativeImageEditor.offset(
                ~x=
                  {e##nativeEvent##locationX /. displayWidth < 0.5
                     ? 0 : (0.5 *. imageWidth)->floor->truncate},
                ~y=
                  {e##nativeEvent##locationY /. displayHeight < 0.5
                     ? 0 : (0.5 *. imageHeight)->floor->truncate},
              )
              ->cropData,
              dispatch,
              link =>
              SetPath(Some(link))
            )
          }>
          <Image
            source={Image.Source.fromUriSource(
              Image.uriSource(
                ~uri=
                  Belt.Option.getWithDefault(
                    state.path,
                    imageUri,
                  ),
                ~width=displayWidth,
                ~height=
                  if (state.imageLoaded) {
                    displayHeight;
                  } else {
                    0.;
                  },
                (),
              ),
            )}
            resizeMode=`contain
            onLoadEnd={() => dispatch(SetImageLoaded)}
          />
        </TouchableOpacity>
        {state.imageLoaded
           ? React.null
           : <Text> "Please wait while image is loaded."->React.string </Text>}
      </View>
      <Button title="Reset Image" onPress={_ => dispatch(SetPath(None))} />
    </View>;
};

Changelog

Check the changelog for more informations about recent releases.

Contribute

Read the contribution guidelines before contributing.

Code of Conduct

We want this community to be friendly and respectful to each other. Please read our full code of conduct so that you can understand what actions will and will not be tolerated.