react-native-gesture-handler/lib/module/web/tools/GestureHandlerWebDelegate.js

Declarative API exposing native platform touch and gesture system to React Native

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

import findNodeHandle from '../../findNodeHandle';
import PointerEventManager from './PointerEventManager';
import { State } from '../../State';
import { isPointerInBounds } from '../utils';
import { MouseButton } from '../../handlers/gestureHandlerCommon';
import KeyboardEventManager from './KeyboardEventManager';
import WheelEventManager from './WheelEventManager';
export class GestureHandlerWebDelegate {
  constructor() {
    _defineProperty(this, "isInitialized", false);

    _defineProperty(this, "view", void 0);

    _defineProperty(this, "gestureHandler", void 0);

    _defineProperty(this, "eventManagers", []);

    _defineProperty(this, "defaultViewStyles", {
      userSelect: '',
      touchAction: ''
    });
  }

  getView() {
    return this.view;
  }

  init(viewRef, handler) {
    if (!viewRef) {
      throw new Error(`Cannot find HTML Element for handler ${handler.getTag()}`);
    }

    this.isInitialized = true;
    this.gestureHandler = handler;
    this.view = findNodeHandle(viewRef);
    this.defaultViewStyles = {
      userSelect: this.view.style.userSelect,
      touchAction: this.view.style.touchAction
    };
    const config = handler.getConfig();
    this.setUserSelect(config.enabled);
    this.setTouchAction(config.enabled);
    this.setContextMenu(config.enabled);
    this.eventManagers.push(new PointerEventManager(this.view));
    this.eventManagers.push(new KeyboardEventManager(this.view));
    this.eventManagers.push(new WheelEventManager(this.view));
    this.eventManagers.forEach(manager => this.gestureHandler.attachEventManager(manager));
  }

  isPointerInBounds({
    x,
    y
  }) {
    return isPointerInBounds(this.view, {
      x,
      y
    });
  }

  measureView() {
    const rect = this.view.getBoundingClientRect();
    return {
      pageX: rect.left,
      pageY: rect.top,
      width: rect.width,
      height: rect.height
    };
  }

  reset() {
    this.eventManagers.forEach(manager => manager.resetManager());
  }

  tryResetCursor() {
    const config = this.gestureHandler.getConfig();

    if (config.activeCursor && config.activeCursor !== 'auto' && this.gestureHandler.getState() === State.ACTIVE) {
      this.view.style.cursor = 'auto';
    }
  }

  shouldDisableContextMenu(config) {
    return config.enableContextMenu === undefined && this.gestureHandler.isButtonInConfig(MouseButton.RIGHT) || config.enableContextMenu === false;
  }

  addContextMenuListeners(config) {
    if (this.shouldDisableContextMenu(config)) {
      this.view.addEventListener('contextmenu', this.disableContextMenu);
    } else if (config.enableContextMenu) {
      this.view.addEventListener('contextmenu', this.enableContextMenu);
    }
  }

  removeContextMenuListeners(config) {
    if (this.shouldDisableContextMenu(config)) {
      this.view.removeEventListener('contextmenu', this.disableContextMenu);
    } else if (config.enableContextMenu) {
      this.view.removeEventListener('contextmenu', this.enableContextMenu);
    }
  }

  disableContextMenu(e) {
    e.preventDefault();
  }

  enableContextMenu(e) {
    e.stopPropagation();
  }

  setUserSelect(isHandlerEnabled) {
    const {
      userSelect
    } = this.gestureHandler.getConfig();
    this.view.style['userSelect'] = isHandlerEnabled ? userSelect !== null && userSelect !== void 0 ? userSelect : 'none' : this.defaultViewStyles.userSelect;
    this.view.style['webkitUserSelect'] = isHandlerEnabled ? userSelect !== null && userSelect !== void 0 ? userSelect : 'none' : this.defaultViewStyles.userSelect;
  }

  setTouchAction(isHandlerEnabled) {
    const {
      touchAction
    } = this.gestureHandler.getConfig();
    this.view.style['touchAction'] = isHandlerEnabled ? touchAction !== null && touchAction !== void 0 ? touchAction : 'none' : this.defaultViewStyles.touchAction; // @ts-ignore This one disables default events on Safari

    this.view.style['WebkitTouchCallout'] = isHandlerEnabled ? touchAction !== null && touchAction !== void 0 ? touchAction : 'none' : this.defaultViewStyles.touchAction;
  }

  setContextMenu(isHandlerEnabled) {
    const config = this.gestureHandler.getConfig();

    if (isHandlerEnabled) {
      this.addContextMenuListeners(config);
    } else {
      this.removeContextMenuListeners(config);
    }
  }

  onEnabledChange(enabled) {
    if (!this.isInitialized) {
      return;
    }

    this.setUserSelect(enabled);
    this.setTouchAction(enabled);
    this.setContextMenu(enabled);
  }

  onBegin() {// no-op for now
  }

  onActivate() {
    const config = this.gestureHandler.getConfig();

    if ((!this.view.style.cursor || this.view.style.cursor === 'auto') && config.activeCursor) {
      this.view.style.cursor = config.activeCursor;
    }
  }

  onEnd() {
    this.tryResetCursor();
  }

  onCancel() {
    this.tryResetCursor();
  }

  onFail() {
    this.tryResetCursor();
  }

  destroy(config) {
    this.removeContextMenuListeners(config);
    this.eventManagers.forEach(manager => {
      manager.unregisterListeners();
    });
  }

}
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