init commit

.gitignore

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+dist
+node_modules
+.DS_Store

.npmignore

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+tsconfig.json
+src

package.json

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+{
+  "name": "react-native-gesture-detector",
+  "version": "1.0.0",
+  "description": "Define and detect custom gestures in React Native.",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "repository": {
+    "url": "[email protected]:mxmzb/react-native-gesture-detector.git",
+    "type": "git"
+  },
+  "author": "Maxim Zubarev <[email protected]>",
+  "license": "MIT",
+  "scripts": {
+    "build": "tsc -p .",
+    "bootstrap": "yarn example && yarn",
+    "example": "yarn --cwd example",
+    "test": "jest",
+    "lint": "eslint . --ext '.js,.ts,.tsx'",
+    "typescript": "tsc"
+  },
+  "publishConfig": {
+    "registry": "https://registry.npmjs.org/"
+  },
+  "peerDependencies": {
+    "lodash": "*",
+    "react": "*",
+    "react-native": "*",
+    "react-native-gesture-handler": "*"
+  },
+  "devDependencies": {
+    "@types/jest": "^24.0.18",
+    "@types/node": "^10.14.17",
+    "@types/react": "^16.9.2",
+    "@types/react-native": "^0.60.9",
+    "@types/lodash": "^4.14.138",
+    "commitlint": "^8.0.0",
+    "eslint": "^5.16.0",
+    "eslint-config-satya164": "^2.4.1",
+    "eslint-plugin-react-native-globals": "^0.1.0",
+    "jest": "^24.9.0",
+    "lodash": "^4.17.15",
+    "react-native-gesture-handler": "^1.4.1",
+    "typescript": "^3.6.2"
+  }
+}

prettier.config.js

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+/* eslint-disable import/no-commonjs */
+
+module.exports = {
+  printWidth: 100,
+  tabWidth: 2,
+  useTabs: false,
+  semi: true,
+  singleQuote: false,
+  trailingComma: "all",
+  bracketSpacing: true,
+};

src/GestureDetector.tsx

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+import React, { useState, useEffect, ReactNode } from "react";
+import { PanGestureHandler, State } from "react-native-gesture-handler";
+import _ from "lodash";
+
+interface Coordinate {
+  x: number;
+  y: number;
+}
+
+type GestureDetectorProps = {
+  children: (props: { coordinate: Coordinate }) => ReactNode;
+  slopRadius: number;
+  gestures: [Coordinate];
+  onProgress: any;
+  onGestureFinish: any;
+  onPanRelease: any;
+  throttleMs: any;
+};
+
+const GestureDetector = ({
+  children,
+  slopRadius,
+  gestures,
+  onProgress,
+  onGestureFinish,
+  onPanRelease,
+  throttleMs,
+}: GestureDetectorProps) => {
+  const gesturesArr = Object.keys(gestures);
+
+  const initMatchedGestureCoordinates = () => {
+    const obj = {};
+    for (let i = 0; i < gesturesArr.length; i++) {
+      obj[gesturesArr[i]] = 0;
+    }
+    return obj;
+  };
+
+  const [coordinate, setCoordinate] = useState(null);
+  const [startCoordinate, setStartCoordinate] = useState(null);
+  const [path, setPath] = useState([]);
+  const [matchedGestureCoordinates, setMatchedGestureCoordinates] = useState(
+    initMatchedGestureCoordinates(),
+  );
+  const [currentPathCoordinateIndex, setCurrentPathCoordinateIndex] = useState(0);
+
+  const reset = () => {
+    setCoordinate(null);
+    setStartCoordinate(null);
+    setPath([]);
+    setMatchedGestureCoordinates(initMatchedGestureCoordinates());
+    setCurrentPathCoordinateIndex(0);
+  };
+
+  const addBreadcrumbToPath = ({ x, y }) => {
+    if (!startCoordinate) {
+      setStartCoordinate({ x, y });
+      setPath([{ x: 0, y: 0 }]);
+    } else {
+      setPath([...path, normalizeCoordinate({ x, y })]);
+    }
+  };
+
+  const normalizeCoordinate = ({ x, y }) => ({
+    x: x - startCoordinate.x,
+    y: y - startCoordinate.y,
+  });
+
+  const coordinateIsInRange = ({ gestureCoordinate, candidateCoordinate, radius }) =>
+    Math.pow(candidateCoordinate.x - gestureCoordinate.x, 2) +
+      Math.pow(candidateCoordinate.y - gestureCoordinate.y, 2) <
+    Math.pow(radius, 2);
+  // Math.pow(radius / 2, 2);
+
+  useEffect(() => {
+    if (currentPathCoordinateIndex < path.length - 1) {
+      for (let i = 0; i < gesturesArr.length; i++) {
+        const gestureKey = gesturesArr[i];
+        const gesture = gestures[gestureKey];
+
+        if (matchedGestureCoordinates[gestureKey] < gesture.length) {
+          if (
+            coordinateIsInRange({
+              gestureCoordinate: gesture[matchedGestureCoordinates[gestureKey]],
+              candidateCoordinate: path[currentPathCoordinateIndex],
+              radius: slopRadius,
+            })
+          ) {
+            onProgress({
+              progress: (matchedGestureCoordinates[gestureKey] + 1) / gesture.length,
+              gesture: gestureKey,
+            });
+
+            if (matchedGestureCoordinates[gestureKey] === gesture.length - 2) {
+              onGestureFinish(gestureKey);
+            }
+
+            setMatchedGestureCoordinates(
+              Object.assign({}, matchedGestureCoordinates, {
+                [gestureKey]: matchedGestureCoordinates[gestureKey] + 1,
+              }),
+            );
+          }
+        }
+      }
+      setCurrentPathCoordinateIndex(currentPathCoordinateIndex + 1);
+    }
+  }, [
+    path,
+    currentPathCoordinateIndex,
+    gesturesArr,
+    matchedGestureCoordinates,
+    gestures,
+    slopRadius,
+    onProgress,
+    onGestureFinish,
+  ]);
+
+  const throttledOnGestureEventHandler = _.throttle(({ nativeEvent }) => {
+    setCoordinate({ x: nativeEvent.absoluteX, y: nativeEvent.absoluteY });
+    addBreadcrumbToPath(nativeEvent);
+  }, throttleMs);
+
+  return (
+    <PanGestureHandler
+      onGestureEvent={event => {
+        throttledOnGestureEventHandler({ nativeEvent: event.nativeEvent });
+      }}
+      onHandlerStateChange={({ nativeEvent }) => {
+        if (nativeEvent.state === State.END) {
+          reset();
+          onPanRelease();
+        }
+      }}
+    >
+      {children({ coordinate })}
+    </PanGestureHandler>
+  );
+};
+
+GestureDetector.defaultProps = {
+  gestures: [],
+  slopRadius: 50,
+  throttleMs: 500,
+  onProgress: () => {},
+  onGestureFinish: () => {},
+  onPanRelease: () => {},
+};
+
+export default GestureDetector;

src/GesturePath.tsx

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+import React from "react";
+import { View } from "react-native";
+
+// const Breadcrumb = styled.View`
+//   position: absolute;
+//   top: 50%;
+//   left: 50%;
+//   margin-top: ${props => props.y - props.radius};
+//   margin-left: ${props => props.x - props.radius};
+//   width: ${props => props.radius * 2};
+//   height: ${props => props.radius * 2};
+//   border-radius: ${props => props.radius};
+//   background: ${props => props.color};
+//   opacity: 0.4;
+// `;
+
+type GesturePathProps = {
+  path: any;
+  color: any;
+  slopRadius: any;
+};
+
+const style = {
+  position: "absolute",
+  top: "50%",
+  left: "50%",
+  opacity: 0.4,
+};
+
+const GesturePath = ({ path, color, slopRadius }: GesturePathProps) => (
+  <>
+    {path.map((point, index) => (
+      <View />
+      // <View style={style} x={point.x} y={point.y} key={index} radius={slopRadius} color={color} />
+    ))}
+  </>
+);
+
+GesturePath.defaultProps = {
+  path: [],
+  slopRadius: 50,
+  color: "black",
+};
+
+export default GesturePath;

src/index.ts

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+import GestureDetector from "./GestureDetector";
+import GesturePath from "./GesturePath";
+
+export { GesturePath };
+
+export default GestureDetector;

tsconfig.json

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+{
+  "compilerOptions": {
+    /* Basic Options */
+    // "incremental": true,                   /* Enable incremental compilation */
+    "target": "es5" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */,
+    "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
+    "lib": ["es2015"] /* Specify library files to be included in the compilation. */,
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    "jsx": "react" /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */,
+    "declaration": true /* Generates corresponding '.d.ts' file. */,
+    "declarationMap": true /* Generates a sourcemap for each corresponding '.d.ts' file. */,
+    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    "outDir": "dist" /* Redirect output structure to the directory. */,
+    "rootDir": "./src" /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */,
+    // "composite": true,                     /* Enable project compilation */
+    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
+    // "removeComments": true,                /* Do not emit comments to output. */
+    "noEmit": true /* Do not emit outputs. */,
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": false /* Enable all strict type-checking options. */,
+    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,              /* Enable strict null checks. */
+    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    // "noUnusedLocals": true,                /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": ["react"] /* Type declaration files to be included in compilation. */,
+    "allowSyntheticDefaultImports": true /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */,
+    "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+  },
+  "include": ["./src"]
+}