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Viewing file:     DragDropMonitorImpl.js (5.31 KB)      -rw-r--r--

import { invariant } from '@react-dnd/invariant';
import matchesType from './utils/matchesType';
import { getSourceClientOffset, getDifferenceFromInitialOffset, } from './utils/coords';
import { areDirty } from './utils/dirtiness';
export default class DragDropMonitorImpl {
    constructor(store, registry) {
        this.store = store;
        this.registry = registry;
    }
    subscribeToStateChange(listener, options = { handlerIds: undefined }) {
        const { handlerIds } = options;
        invariant(typeof listener === 'function', 'listener must be a function.');
        invariant(typeof handlerIds === 'undefined' || Array.isArray(handlerIds), 'handlerIds, when specified, must be an array of strings.');
        let prevStateId = this.store.getState().stateId;
        const handleChange = () => {
            const state = this.store.getState();
            const currentStateId = state.stateId;
            try {
                const canSkipListener = currentStateId === prevStateId ||
                    (currentStateId === prevStateId + 1 &&
                        !areDirty(state.dirtyHandlerIds, handlerIds));
                if (!canSkipListener) {
                    listener();
                }
            }
            finally {
                prevStateId = currentStateId;
            }
        };
        return this.store.subscribe(handleChange);
    }
    subscribeToOffsetChange(listener) {
        invariant(typeof listener === 'function', 'listener must be a function.');
        let previousState = this.store.getState().dragOffset;
        const handleChange = () => {
            const nextState = this.store.getState().dragOffset;
            if (nextState === previousState) {
                return;
            }
            previousState = nextState;
            listener();
        };
        return this.store.subscribe(handleChange);
    }
    canDragSource(sourceId) {
        if (!sourceId) {
            return false;
        }
        const source = this.registry.getSource(sourceId);
        invariant(source, 'Expected to find a valid source.');
        if (this.isDragging()) {
            return false;
        }
        return source.canDrag(this, sourceId);
    }
    canDropOnTarget(targetId) {
        // undefined on initial render
        if (!targetId) {
            return false;
        }
        const target = this.registry.getTarget(targetId);
        invariant(target, 'Expected to find a valid target.');
        if (!this.isDragging() || this.didDrop()) {
            return false;
        }
        const targetType = this.registry.getTargetType(targetId);
        const draggedItemType = this.getItemType();
        return (matchesType(targetType, draggedItemType) && target.canDrop(this, targetId));
    }
    isDragging() {
        return Boolean(this.getItemType());
    }
    isDraggingSource(sourceId) {
        // undefined on initial render
        if (!sourceId) {
            return false;
        }
        const source = this.registry.getSource(sourceId, true);
        invariant(source, 'Expected to find a valid source.');
        if (!this.isDragging() || !this.isSourcePublic()) {
            return false;
        }
        const sourceType = this.registry.getSourceType(sourceId);
        const draggedItemType = this.getItemType();
        if (sourceType !== draggedItemType) {
            return false;
        }
        return source.isDragging(this, sourceId);
    }
    isOverTarget(targetId, options = { shallow: false }) {
        // undefined on initial render
        if (!targetId) {
            return false;
        }
        const { shallow } = options;
        if (!this.isDragging()) {
            return false;
        }
        const targetType = this.registry.getTargetType(targetId);
        const draggedItemType = this.getItemType();
        if (draggedItemType && !matchesType(targetType, draggedItemType)) {
            return false;
        }
        const targetIds = this.getTargetIds();
        if (!targetIds.length) {
            return false;
        }
        const index = targetIds.indexOf(targetId);
        if (shallow) {
            return index === targetIds.length - 1;
        }
        else {
            return index > -1;
        }
    }
    getItemType() {
        return this.store.getState().dragOperation.itemType;
    }
    getItem() {
        return this.store.getState().dragOperation.item;
    }
    getSourceId() {
        return this.store.getState().dragOperation.sourceId;
    }
    getTargetIds() {
        return this.store.getState().dragOperation.targetIds;
    }
    getDropResult() {
        return this.store.getState().dragOperation.dropResult;
    }
    didDrop() {
        return this.store.getState().dragOperation.didDrop;
    }
    isSourcePublic() {
        return this.store.getState().dragOperation.isSourcePublic;
    }
    getInitialClientOffset() {
        return this.store.getState().dragOffset.initialClientOffset;
    }
    getInitialSourceClientOffset() {
        return this.store.getState().dragOffset.initialSourceClientOffset;
    }
    getClientOffset() {
        return this.store.getState().dragOffset.clientOffset;
    }
    getSourceClientOffset() {
        return getSourceClientOffset(this.store.getState().dragOffset);
    }
    getDifferenceFromInitialOffset() {
        return getDifferenceFromInitialOffset(this.store.getState().dragOffset);
    }
}