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Viewing file:     DragLayer.js (4.86 KB)      -rw-r--r--

import * as React from 'react';
import { shallowEqual } from '@react-dnd/shallowequal';
import hoistStatics from 'hoist-non-react-statics';
import { invariant } from '@react-dnd/invariant';
import { DndContext } from '../index';
import { isPlainObject } from '../utils/js_utils';
import { isRefable, checkDecoratorArguments } from './utils';
export function DragLayer(collect, options = {}) {
    checkDecoratorArguments('DragLayer', 'collect[, options]', collect, options);
    invariant(typeof collect === 'function', 'Expected "collect" provided as the first argument to DragLayer to be a function that collects props to inject into the component. ', 'Instead, received %s. Read more: http://react-dnd.github.io/react-dnd/docs/api/drag-layer', collect);
    invariant(isPlainObject(options), 'Expected "options" provided as the second argument to DragLayer to be a plain object when specified. ' +
        'Instead, received %s. Read more: http://react-dnd.github.io/react-dnd/docs/api/drag-layer', options);
    return function decorateLayer(DecoratedComponent) {
        const Decorated = DecoratedComponent;
        const { arePropsEqual = shallowEqual } = options;
        const displayName = Decorated.displayName || Decorated.name || 'Component';
        class DragLayerContainer extends React.Component {
            constructor() {
                super(...arguments);
                this.isCurrentlyMounted = false;
                this.ref = React.createRef();
                this.handleChange = () => {
                    if (!this.isCurrentlyMounted) {
                        return;
                    }
                    const nextState = this.getCurrentState();
                    if (!shallowEqual(nextState, this.state)) {
                        this.setState(nextState);
                    }
                };
            }
            getDecoratedComponentInstance() {
                invariant(this.ref.current, 'In order to access an instance of the decorated component, it must either be a class component or use React.forwardRef()');
                return this.ref.current;
            }
            shouldComponentUpdate(nextProps, nextState) {
                return (!arePropsEqual(nextProps, this.props) ||
                    !shallowEqual(nextState, this.state));
            }
            componentDidMount() {
                this.isCurrentlyMounted = true;
                this.handleChange();
            }
            componentWillUnmount() {
                this.isCurrentlyMounted = false;
                if (this.unsubscribeFromOffsetChange) {
                    this.unsubscribeFromOffsetChange();
                    this.unsubscribeFromOffsetChange = undefined;
                }
                if (this.unsubscribeFromStateChange) {
                    this.unsubscribeFromStateChange();
                    this.unsubscribeFromStateChange = undefined;
                }
            }
            render() {
                return (React.createElement(DndContext.Consumer, null, ({ dragDropManager }) => {
                    if (dragDropManager === undefined) {
                        return null;
                    }
                    this.receiveDragDropManager(dragDropManager);
                    // Let componentDidMount fire to initialize the collected state
                    if (!this.isCurrentlyMounted) {
                        return null;
                    }
                    return (React.createElement(Decorated, Object.assign({}, this.props, this.state, { ref: isRefable(Decorated) ? this.ref : null })));
                }));
            }
            receiveDragDropManager(dragDropManager) {
                if (this.manager !== undefined) {
                    return;
                }
                this.manager = dragDropManager;
                invariant(typeof dragDropManager === 'object', 'Could not find the drag and drop manager in the context of %s. ' +
                    'Make sure to render a DndProvider component in your top-level component. ' +
                    'Read more: http://react-dnd.github.io/react-dnd/docs/troubleshooting#could-not-find-the-drag-and-drop-manager-in-the-context', displayName, displayName);
                const monitor = this.manager.getMonitor();
                this.unsubscribeFromOffsetChange = monitor.subscribeToOffsetChange(this.handleChange);
                this.unsubscribeFromStateChange = monitor.subscribeToStateChange(this.handleChange);
            }
            getCurrentState() {
                if (!this.manager) {
                    return {};
                }
                const monitor = this.manager.getMonitor();
                return collect(monitor, this.props);
            }
        }
        DragLayerContainer.displayName = `DragLayer(${displayName})`;
        DragLayerContainer.DecoratedComponent = DecoratedComponent;
        return hoistStatics(DragLayerContainer, DecoratedComponent);
    };
}