@vizzly/dnd-backend - npm Package Compare versions

Comparing version 0.0.1 to 0.0.2

dist/index.js

@@ -1,7 +0,918 @@
-import { HTML5BackendImpl } from './HTML5BackendImpl.js';
-export { getEmptyImage } from './getEmptyImage.js';
-export * as NativeTypes from './NativeTypes.js';
-export const HTML5Backend = function createBackend(manager, context, options) {
+// cheap lodash replacements
+function memoize(fn) {
+    let result = null;
+    const memoized = () => {
+        if (result == null) {
+            result = fn();
+        }
+        return result;
+    };
+    return memoized;
+}
+/**
+ * drop-in replacement for _.without
+ */
+function without(items, item) {
+    return items.filter((i) => i !== item);
+}
+function union(itemsA, itemsB) {
+    const set = new Set();
+    const insertItem = (item) => set.add(item);
+    itemsA.forEach(insertItem);
+    itemsB.forEach(insertItem);
+    const result = [];
+    set.forEach((key) => result.push(key));
+    return result;
+}
+
+class EnterLeaveCounter {
+    constructor(isNodeInDocument) {
+        this.entered = [];
+        this.isNodeInDocument = isNodeInDocument;
+    }
+    enter(enteringNode) {
+        const previousLength = this.entered.length;
+        const isNodeEntered = (node) => this.isNodeInDocument(node) &&
+            (!node.contains || node.contains(enteringNode));
+        this.entered = union(this.entered.filter(isNodeEntered), [enteringNode]);
+        return previousLength === 0 && this.entered.length > 0;
+    }
+    leave(leavingNode) {
+        const previousLength = this.entered.length;
+        this.entered = without(this.entered.filter(this.isNodeInDocument), leavingNode);
+        return previousLength > 0 && this.entered.length === 0;
+    }
+    reset() {
+        this.entered = [];
+    }
+}
+
+class NativeDragSource {
+    constructor(config) {
+        this.config = config;
+        this.item = {};
+        this.initializeExposedProperties();
+    }
+    initializeExposedProperties() {
+        Object.keys(this.config.exposeProperties).forEach((property) => {
+            Object.defineProperty(this.item, property, {
+                configurable: true, // This is needed to allow redefining it later
+                enumerable: true,
+                get() {
+                    // eslint-disable-next-line no-console
+                    console.warn(`Browser doesn't allow reading "${property}" until the drop event.`);
+                    return null;
+                },
+            });
+        });
+    }
+    loadDataTransfer(dataTransfer) {
+        if (dataTransfer) {
+            const newProperties = {};
+            Object.keys(this.config.exposeProperties).forEach((property) => {
+                const propertyFn = this.config.exposeProperties[property];
+                if (propertyFn != null) {
+                    newProperties[property] = {
+                        value: propertyFn(dataTransfer, this.config.matchesTypes),
+                        configurable: true,
+                        enumerable: true,
+                    };
+                }
+            });
+            Object.defineProperties(this.item, newProperties);
+        }
+    }
+    canDrag() {
+        return true;
+    }
+    beginDrag() {
+        return this.item;
+    }
+    isDragging(monitor, handle) {
+        return handle === monitor.getSourceId();
+    }
+    endDrag() {
+        // empty
+    }
+}
+
+const FILE = '__NATIVE_FILE__';
+const URL = '__NATIVE_URL__';
+const TEXT = '__NATIVE_TEXT__';
+const HTML = '__NATIVE_HTML__';
+
+var NativeTypes = /*#__PURE__*/Object.freeze({
+    __proto__: null,
+    FILE: FILE,
+    HTML: HTML,
+    TEXT: TEXT,
+    URL: URL
+});
+
+function getDataFromDataTransfer(dataTransfer, typesToTry, defaultValue) {
+    const result = typesToTry.reduce((resultSoFar, typeToTry) => resultSoFar || dataTransfer.getData(typeToTry), '');
+    return result != null ? result : defaultValue;
+}
+
+const nativeTypesConfig = {
+    [FILE]: {
+        exposeProperties: {
+            files: (dataTransfer) => Array.prototype.slice.call(dataTransfer.files),
+            items: (dataTransfer) => dataTransfer.items,
+            dataTransfer: (dataTransfer) => dataTransfer,
+        },
+        matchesTypes: ['Files'],
+    },
+    [HTML]: {
+        exposeProperties: {
+            html: (dataTransfer, matchesTypes) => getDataFromDataTransfer(dataTransfer, matchesTypes, ''),
+            dataTransfer: (dataTransfer) => dataTransfer,
+        },
+        matchesTypes: ['Html', 'text/html'],
+    },
+    [URL]: {
+        exposeProperties: {
+            urls: (dataTransfer, matchesTypes) => getDataFromDataTransfer(dataTransfer, matchesTypes, '').split('\n'),
+            dataTransfer: (dataTransfer) => dataTransfer,
+        },
+        matchesTypes: ['Url', 'text/uri-list'],
+    },
+    [TEXT]: {
+        exposeProperties: {
+            text: (dataTransfer, matchesTypes) => getDataFromDataTransfer(dataTransfer, matchesTypes, ''),
+            dataTransfer: (dataTransfer) => dataTransfer,
+        },
+        matchesTypes: ['Text', 'text/plain'],
+    },
+};
+
+function createNativeDragSource(type, dataTransfer) {
+    const config = nativeTypesConfig[type];
+    if (!config) {
+        throw new Error(`native type ${type} has no configuration`);
+    }
+    const result = new NativeDragSource(config);
+    result.loadDataTransfer(dataTransfer);
+    return result;
+}
+function matchNativeItemType(dataTransfer) {
+    if (!dataTransfer) {
+        return null;
+    }
+    const dataTransferTypes = Array.prototype.slice.call(dataTransfer.types || []);
+    return (Object.keys(nativeTypesConfig).filter((nativeItemType) => {
+        const typeConfig = nativeTypesConfig[nativeItemType];
+        if (!(typeConfig === null || typeConfig === void 0 ? void 0 : typeConfig.matchesTypes)) {
+            return false;
+        }
+        return typeConfig.matchesTypes.some((t) => dataTransferTypes.indexOf(t) > -1);
+    })[0] || null);
+}
+
+const isFirefox = memoize(() => /firefox/i.test(navigator.userAgent));
+const isSafari = memoize(() => Boolean(window.safari));
+
+/* eslint-disable @typescript-eslint/no-non-null-assertion */
+class MonotonicInterpolant {
+    constructor(xs, ys) {
+        const { length } = xs;
+        // Rearrange xs and ys so that xs is sorted
+        const indexes = [];
+        for (let i = 0; i < length; i++) {
+            indexes.push(i);
+        }
+        indexes.sort((a, b) => (xs[a] < xs[b] ? -1 : 1));
+        const dxs = [];
+        const ms = [];
+        let dx;
+        let dy;
+        for (let i = 0; i < length - 1; i++) {
+            dx = xs[i + 1] - xs[i];
+            dy = ys[i + 1] - ys[i];
+            dxs.push(dx);
+            ms.push(dy / dx);
+        }
+        // Get degree-1 coefficients
+        const c1s = [ms[0]];
+        for (let i = 0; i < dxs.length - 1; i++) {
+            const m2 = ms[i];
+            const mNext = ms[i + 1];
+            if (m2 * mNext <= 0) {
+                c1s.push(0);
+            }
+            else {
+                dx = dxs[i];
+                const dxNext = dxs[i + 1];
+                const common = dx + dxNext;
+                c1s.push((3 * common) / ((common + dxNext) / m2 + (common + dx) / mNext));
+            }
+        }
+        c1s.push(ms[ms.length - 1]);
+        // Get degree-2 and degree-3 coefficients
+        const c2s = [];
+        const c3s = [];
+        let m;
+        for (let i = 0; i < c1s.length - 1; i++) {
+            m = ms[i];
+            const c1 = c1s[i];
+            const invDx = 1 / dxs[i];
+            const common = c1 + c1s[i + 1] - m - m;
+            c2s.push((m - c1 - common) * invDx);
+            c3s.push(common * invDx * invDx);
+        }
+        this.xs = xs;
+        this.ys = ys;
+        this.c1s = c1s;
+        this.c2s = c2s;
+        this.c3s = c3s;
+    }
+    interpolate(x) {
+        const { xs, ys, c1s, c2s, c3s } = this;
+        // The rightmost point in the dataset should give an exact result
+        let i = xs.length - 1;
+        if (x === xs[i]) {
+            return ys[i];
+        }
+        // Search for the interval x is in, returning the corresponding y if x is one of the original xs
+        let low = 0;
+        let high = c3s.length - 1;
+        let mid;
+        while (low <= high) {
+            mid = Math.floor(0.5 * (low + high));
+            const xHere = xs[mid];
+            if (xHere < x) {
+                low = mid + 1;
+            }
+            else if (xHere > x) {
+                high = mid - 1;
+            }
+            else {
+                return ys[mid];
+            }
+        }
+        i = Math.max(0, high);
+        // Interpolate
+        const diff = x - xs[i];
+        const diffSq = diff * diff;
+        return ys[i] + c1s[i] * diff + c2s[i] * diffSq + c3s[i] * diff * diffSq;
+    }
+}
+
+const ELEMENT_NODE = 1;
+function getNodeClientOffset(node) {
+    const el = node.nodeType === ELEMENT_NODE ? node : node.parentElement;
+    if (!el) {
+        return null;
+    }
+    const { top, left } = el.getBoundingClientRect();
+    return { x: left, y: top };
+}
+function getEventClientOffset(e) {
+    return {
+        x: e.clientX,
+        y: e.clientY,
+    };
+}
+function isImageNode(node) {
+    var _a;
+    return (node.nodeName === 'IMG' &&
+        (isFirefox() || !((_a = document.documentElement) === null || _a === void 0 ? void 0 : _a.contains(node))));
+}
+function getDragPreviewSize(isImage, dragPreview, sourceWidth, sourceHeight) {
+    let dragPreviewWidth = isImage ? dragPreview.width : sourceWidth;
+    let dragPreviewHeight = isImage ? dragPreview.height : sourceHeight;
+    // Work around @2x coordinate discrepancies in browsers
+    if (isSafari() && isImage) {
+        dragPreviewHeight /= window.devicePixelRatio;
+        dragPreviewWidth /= window.devicePixelRatio;
+    }
+    return { dragPreviewWidth, dragPreviewHeight };
+}
+function getDragPreviewOffset(sourceNode, dragPreview, clientOffset, anchorPoint, offsetPoint) {
+    // The browsers will use the image intrinsic size under different conditions.
+    // Firefox only cares if it's an image, but WebKit also wants it to be detached.
+    const isImage = isImageNode(dragPreview);
+    const dragPreviewNode = isImage ? sourceNode : dragPreview;
+    const dragPreviewNodeOffsetFromClient = getNodeClientOffset(dragPreviewNode);
+    const offsetFromDragPreview = {
+        x: clientOffset.x - dragPreviewNodeOffsetFromClient.x,
+        y: clientOffset.y - dragPreviewNodeOffsetFromClient.y,
+    };
+    const { offsetWidth: sourceWidth, offsetHeight: sourceHeight } = sourceNode;
+    const { anchorX, anchorY } = anchorPoint;
+    const { dragPreviewWidth, dragPreviewHeight } = getDragPreviewSize(isImage, dragPreview, sourceWidth, sourceHeight);
+    const calculateYOffset = () => {
+        const interpolantY = new MonotonicInterpolant([0, 0.5, 1], [
+            // Dock to the top
+            offsetFromDragPreview.y,
+            // Align at the center
+            (offsetFromDragPreview.y / sourceHeight) * dragPreviewHeight,
+            // Dock to the bottom
+            offsetFromDragPreview.y + dragPreviewHeight - sourceHeight,
+        ]);
+        let y = interpolantY.interpolate(anchorY);
+        // Work around Safari 8 positioning bug
+        if (isSafari() && isImage) {
+            // We'll have to wait for @3x to see if this is entirely correct
+            y += (window.devicePixelRatio - 1) * dragPreviewHeight;
+        }
+        return y;
+    };
+    const calculateXOffset = () => {
+        // Interpolate coordinates depending on anchor point
+        // If you know a simpler way to do this, let me know
+        const interpolantX = new MonotonicInterpolant([0, 0.5, 1], [
+            // Dock to the left
+            offsetFromDragPreview.x,
+            // Align at the center
+            (offsetFromDragPreview.x / sourceWidth) * dragPreviewWidth,
+            // Dock to the right
+            offsetFromDragPreview.x + dragPreviewWidth - sourceWidth,
+        ]);
+        return interpolantX.interpolate(anchorX);
+    };
+    // Force offsets if specified in the options.
+    const { offsetX, offsetY } = offsetPoint;
+    const isManualOffsetX = offsetX === 0 || offsetX;
+    const isManualOffsetY = offsetY === 0 || offsetY;
+    return {
+        x: isManualOffsetX ? offsetX : calculateXOffset(),
+        y: isManualOffsetY ? offsetY : calculateYOffset(),
+    };
+}
+
+class OptionsReader {
+    constructor(globalContext, options) {
+        this.ownerDocument = null;
+        this.globalContext = globalContext;
+        this.optionsArgs = options;
+    }
+    get window() {
+        var _a;
+        return (_a = this.globalContext) !== null && _a !== void 0 ? _a : (typeof window !== 'undefined' ? window : undefined);
+    }
+    get document() {
+        var _a, _b, _c;
+        return (_b = (_a = this.globalContext) === null || _a === void 0 ? void 0 : _a.document) !== null && _b !== void 0 ? _b : (_c = this.window) === null || _c === void 0 ? void 0 : _c.document;
+    }
+    get rootElement() {
+        var _a;
+        return ((_a = this.optionsArgs) === null || _a === void 0 ? void 0 : _a.rootElement) || this.window;
+    }
+}
+
+class HTML5BackendImpl {
+    constructor(manager, globalContext, options) {
+        this.sourcePreviewNodes = new Map();
+        this.sourcePreviewNodeOptions = new Map();
+        this.sourceNodes = new Map();
+        this.sourceNodeOptions = new Map();
+        this.dragStartSourceIds = null;
+        this.dropTargetIds = [];
+        this.dragEnterTargetIds = [];
+        this.currentNativeSource = null;
+        this.currentNativeHandle = null;
+        this.currentDragSourceNode = null;
+        this.altKeyPressed = false;
+        this.mouseMoveTimeoutTimer = null;
+        this.asyncEndDragFrameId = null;
+        this.dragOverTargetIds = null;
+        this.lastClientOffset = null;
+        this.hoverRafId = null;
+        this.getSourceClientOffset = (sourceId) => {
+            const source = this.sourceNodes.get(sourceId);
+            return (source && getNodeClientOffset(source)) || null;
+        };
+        this.endDragNativeItem = () => {
+            if (!this.isDraggingNativeItem()) {
+                return;
+            }
+            this.actions.endDrag();
+            if (this.currentNativeHandle) {
+                this.registry.removeSource(this.currentNativeHandle);
+            }
+            this.currentNativeHandle = null;
+            this.currentNativeSource = null;
+        };
+        this.isNodeInDocument = (node) => {
+            // Check the node either in the main document or in the current context
+            return Boolean(node &&
+                this.document &&
+                this.document.body &&
+                this.document.body.contains(node));
+        };
+        this.endDragIfSourceWasRemovedFromDOM = () => {
+            const node = this.currentDragSourceNode;
+            if (node == null || this.isNodeInDocument(node)) {
+                return;
+            }
+            if (this.clearCurrentDragSourceNode() && this.monitor.isDragging()) {
+                this.actions.endDrag();
+            }
+            this.cancelHover();
+        };
+        this.scheduleHover = (dragOverTargetIds) => {
+            if (this.hoverRafId === null &&
+                typeof requestAnimationFrame !== "undefined") {
+                this.hoverRafId = requestAnimationFrame(() => {
+                    if (this.monitor.isDragging()) {
+                        this.actions.hover(dragOverTargetIds || [], {
+                            clientOffset: this.lastClientOffset,
+                        });
+                    }
+                    this.hoverRafId = null;
+                });
+            }
+        };
+        this.cancelHover = () => {
+            if (this.hoverRafId !== null &&
+                typeof cancelAnimationFrame !== "undefined") {
+                cancelAnimationFrame(this.hoverRafId);
+                this.hoverRafId = null;
+            }
+        };
+        this.handleTopDragStartCapture = () => {
+            this.clearCurrentDragSourceNode();
+            this.dragStartSourceIds = [];
+        };
+        this.handleTopDragStart = (e) => {
+            if (e.defaultPrevented) {
+                return;
+            }
+            const { dragStartSourceIds } = this;
+            this.dragStartSourceIds = null;
+            const clientOffset = getEventClientOffset(e);
+            // Avoid crashing if we missed a drop event or our previous drag died
+            if (this.monitor.isDragging()) {
+                this.actions.endDrag();
+                this.cancelHover();
+            }
+            // Don't publish the source just yet (see why below)
+            this.actions.beginDrag(dragStartSourceIds || [], {
+                publishSource: false,
+                getSourceClientOffset: this.getSourceClientOffset,
+                clientOffset,
+            });
+            const { dataTransfer } = e;
+            const nativeType = matchNativeItemType(dataTransfer);
+            if (this.monitor.isDragging()) {
+                if (dataTransfer && typeof dataTransfer.setDragImage === "function") {
+                    // Use custom drag image if user specifies it.
+                    // If child drag source refuses drag but parent agrees,
+                    // use parent's node as drag image. Neither works in IE though.
+                    const sourceId = this.monitor.getSourceId();
+                    const sourceNode = this.sourceNodes.get(sourceId);
+                    const dragPreview = this.sourcePreviewNodes.get(sourceId) || sourceNode;
+                    if (dragPreview) {
+                        const { anchorX, anchorY, offsetX, offsetY } = this.getCurrentSourcePreviewNodeOptions();
+                        const anchorPoint = { anchorX, anchorY };
+                        const offsetPoint = { offsetX, offsetY };
+                        const dragPreviewOffset = getDragPreviewOffset(sourceNode, dragPreview, clientOffset, anchorPoint, offsetPoint);
+                        dataTransfer.setDragImage(dragPreview, dragPreviewOffset.x, dragPreviewOffset.y);
+                    }
+                }
+                try {
+                    // Firefox won't drag without setting data
+                    dataTransfer === null || dataTransfer === void 0 ? void 0 : dataTransfer.setData("application/json", {});
+                }
+                catch (err) {
+                    // IE doesn't support MIME types in setData
+                }
+                // Store drag source node so we can check whether
+                // it is removed from DOM and trigger endDrag manually.
+                this.setCurrentDragSourceNode(e.target);
+                // Now we are ready to publish the drag source.. or are we not?
+                const { captureDraggingState } = this.getCurrentSourcePreviewNodeOptions();
+                if (!captureDraggingState) {
+                    // Usually we want to publish it in the next tick so that browser
+                    // is able to screenshot the current (not yet dragging) state.
+                    //
+                    // It also neatly avoids a situation where render() returns null
+                    // in the same tick for the source element, and browser freaks out.
+                    setTimeout(() => this.actions.publishDragSource(), 0);
+                }
+                else {
+                    // In some cases the user may want to override this behavior, e.g.
+                    // to work around IE not supporting custom drag previews.
+                    //
+                    // When using a custom drag layer, the only way to prevent
+                    // the default drag preview from drawing in IE is to screenshot
+                    // the dragging state in which the node itself has zero opacity
+                    // and height. In this case, though, returning null from render()
+                    // will abruptly end the dragging, which is not obvious.
+                    //
+                    // This is the reason such behavior is strictly opt-in.
+                    this.actions.publishDragSource();
+                }
+            }
+            else if (nativeType) {
+                // A native item (such as URL) dragged from inside the document
+                this.beginDragNativeItem(nativeType);
+            }
+            else if (dataTransfer &&
+                !dataTransfer.types &&
+                ((e.target && !e.target.hasAttribute) ||
+                    !e.target.hasAttribute("draggable"))) {
+                // Looks like a Safari bug: dataTransfer.types is null, but there was no draggable.
+                // Just let it drag. It's a native type (URL or text) and will be picked up in
+                // dragenter handler.
+                return;
+            }
+            else {
+                // If by this time no drag source reacted, tell browser not to drag.
+                e.preventDefault();
+            }
+        };
+        this.handleTopDragEndCapture = () => {
+            if (this.clearCurrentDragSourceNode() && this.monitor.isDragging()) {
+                // Firefox can dispatch this event in an infinite loop
+                // if dragend handler does something like showing an alert.
+                // Only proceed if we have not handled it already.
+                this.actions.endDrag();
+            }
+            this.cancelHover();
+        };
+        this.handleTopDragEnterCapture = (e) => {
+            var _a;
+            this.dragEnterTargetIds = [];
+            if (this.isDraggingNativeItem()) {
+                (_a = this.currentNativeSource) === null || _a === void 0 ? void 0 : _a.loadDataTransfer(e.dataTransfer);
+            }
+            const isFirstEnter = this.enterLeaveCounter.enter(e.target);
+            if (!isFirstEnter || this.monitor.isDragging()) {
+                return;
+            }
+            const { dataTransfer } = e;
+            const nativeType = matchNativeItemType(dataTransfer);
+            if (nativeType) {
+                // A native item (such as file or URL) dragged from outside the document
+                this.beginDragNativeItem(nativeType, dataTransfer);
+            }
+        };
+        this.handleTopDragEnter = (e) => {
+            const { dragEnterTargetIds } = this;
+            this.dragEnterTargetIds = [];
+            if (!this.monitor.isDragging()) {
+                // This is probably a native item type we don't understand.
+                return;
+            }
+            this.altKeyPressed = e.altKey;
+            // If the target changes position as the result of `dragenter`, `dragover` might still
+            // get dispatched despite target being no longer there. The easy solution is to check
+            // whether there actually is a target before firing `hover`.
+            if (dragEnterTargetIds.length > 0) {
+                this.actions.hover(dragEnterTargetIds, {
+                    clientOffset: getEventClientOffset(e),
+                });
+            }
+            const canDrop = dragEnterTargetIds.some((targetId) => this.monitor.canDropOnTarget(targetId));
+            if (canDrop) {
+                // IE requires this to fire dragover events
+                e.preventDefault();
+                if (e.dataTransfer) {
+                    e.dataTransfer.dropEffect = this.getCurrentDropEffect();
+                }
+            }
+        };
+        this.handleTopDragOverCapture = (e) => {
+            var _a;
+            this.dragOverTargetIds = [];
+            if (this.isDraggingNativeItem()) {
+                (_a = this.currentNativeSource) === null || _a === void 0 ? void 0 : _a.loadDataTransfer(e.dataTransfer);
+            }
+        };
+        this.handleTopDragOver = (e) => {
+            const { dragOverTargetIds } = this;
+            this.dragOverTargetIds = [];
+            if (!this.monitor.isDragging()) {
+                // This is probably a native item type we don't understand.
+                // Prevent default "drop and blow away the whole document" action.
+                e.preventDefault();
+                if (e.dataTransfer) {
+                    e.dataTransfer.dropEffect = "none";
+                }
+                return;
+            }
+            this.altKeyPressed = e.altKey;
+            this.lastClientOffset = getEventClientOffset(e);
+            this.scheduleHover(dragOverTargetIds);
+            const canDrop = (dragOverTargetIds || []).some((targetId) => this.monitor.canDropOnTarget(targetId));
+            if (canDrop) {
+                // Show user-specified drop effect.
+                e.preventDefault();
+                if (e.dataTransfer) {
+                    e.dataTransfer.dropEffect = this.getCurrentDropEffect();
+                }
+            }
+            else if (this.isDraggingNativeItem()) {
+                // Don't show a nice cursor but still prevent default
+                // "drop and blow away the whole document" action.
+                e.preventDefault();
+            }
+            else {
+                e.preventDefault();
+                if (e.dataTransfer) {
+                    e.dataTransfer.dropEffect = "none";
+                }
+            }
+        };
+        this.handleTopDragLeaveCapture = (e) => {
+            if (this.isDraggingNativeItem()) {
+                e.preventDefault();
+            }
+            const isLastLeave = this.enterLeaveCounter.leave(e.target);
+            if (!isLastLeave) {
+                return;
+            }
+            if (this.isDraggingNativeItem()) {
+                setTimeout(() => this.endDragNativeItem(), 0);
+            }
+            this.cancelHover();
+        };
+        this.handleTopDropCapture = (e) => {
+            var _a;
+            this.dropTargetIds = [];
+            if (this.isDraggingNativeItem()) {
+                e.preventDefault();
+                (_a = this.currentNativeSource) === null || _a === void 0 ? void 0 : _a.loadDataTransfer(e.dataTransfer);
+            }
+            else if (matchNativeItemType(e.dataTransfer)) {
+                // Dragging some elements, like <a> and <img> may still behave like a native drag event,
+                // even if the current drag event matches a user-defined type.
+                // Stop the default behavior when we're not expecting a native item to be dropped.
+                e.preventDefault();
+            }
+            this.enterLeaveCounter.reset();
+        };
+        this.handleTopDrop = (e) => {
+            const { dropTargetIds } = this;
+            this.dropTargetIds = [];
+            this.actions.hover(dropTargetIds, {
+                clientOffset: getEventClientOffset(e),
+            });
+            this.actions.drop({ dropEffect: this.getCurrentDropEffect() });
+            if (this.isDraggingNativeItem()) {
+                this.endDragNativeItem();
+            }
+            else if (this.monitor.isDragging()) {
+                this.actions.endDrag();
+            }
+            this.cancelHover();
+        };
+        this.handleSelectStart = (e) => {
+            const target = e.target;
+            // Only IE requires us to explicitly say
+            // we want drag drop operation to start
+            if (typeof target.dragDrop !== "function") {
+                return;
+            }
+            // Inputs and textareas should be selectable
+            if (target.tagName === "INPUT" ||
+                target.tagName === "SELECT" ||
+                target.tagName === "TEXTAREA" ||
+                target.isContentEditable) {
+                return;
+            }
+            // For other targets, ask IE
+            // to enable drag and drop
+            e.preventDefault();
+            target.dragDrop();
+        };
+        this.options = new OptionsReader(globalContext, options);
+        this.actions = manager.getActions();
+        this.monitor = manager.getMonitor();
+        this.registry = manager.getRegistry();
+        this.enterLeaveCounter = new EnterLeaveCounter(this.isNodeInDocument);
+    }
+    /**
+     * Generate profiling statistics for the HTML5Backend.
+     */
+    profile() {
+        var _a, _b;
+        return {
+            sourcePreviewNodes: this.sourcePreviewNodes.size,
+            sourcePreviewNodeOptions: this.sourcePreviewNodeOptions.size,
+            sourceNodeOptions: this.sourceNodeOptions.size,
+            sourceNodes: this.sourceNodes.size,
+            dragStartSourceIds: ((_a = this.dragStartSourceIds) === null || _a === void 0 ? void 0 : _a.length) || 0,
+            dropTargetIds: this.dropTargetIds.length,
+            dragEnterTargetIds: this.dragEnterTargetIds.length,
+            dragOverTargetIds: ((_b = this.dragOverTargetIds) === null || _b === void 0 ? void 0 : _b.length) || 0,
+        };
+    }
+    // public for test
+    get window() {
+        return this.options.window;
+    }
+    get document() {
+        return this.options.document;
+    }
+    /**
+     * Get the root element to use for event subscriptions
+     */
+    get rootElement() {
+        return this.options.rootElement;
+    }
+    setup() {
+        const root = this.rootElement;
+        if (root === undefined) {
+            return;
+        }
+        if (root.__isReactDndBackendSetUp) {
+            throw new Error("Cannot have two HTML5 backends at the same time.");
+        }
+        root.__isReactDndBackendSetUp = true;
+        this.addEventListeners(root);
+    }
+    teardown() {
+        var _a;
+        const root = this.rootElement;
+        if (root === undefined) {
+            return;
+        }
+        root.__isReactDndBackendSetUp = false;
+        this.removeEventListeners(this.rootElement);
+        this.clearCurrentDragSourceNode();
+        if (this.asyncEndDragFrameId) {
+            (_a = this.window) === null || _a === void 0 ? void 0 : _a.cancelAnimationFrame(this.asyncEndDragFrameId);
+        }
+    }
+    connectDragPreview(sourceId, node, options) {
+        this.sourcePreviewNodeOptions.set(sourceId, options);
+        this.sourcePreviewNodes.set(sourceId, node);
+        return () => {
+            this.sourcePreviewNodes.delete(sourceId);
+            this.sourcePreviewNodeOptions.delete(sourceId);
+        };
+    }
+    connectDragSource(sourceId, node, options) {
+        this.sourceNodes.set(sourceId, node);
+        this.sourceNodeOptions.set(sourceId, options);
+        const handleDragStart = (e) => this.handleDragStart(e, sourceId);
+        const handleSelectStart = (e) => this.handleSelectStart(e);
+        node.setAttribute("draggable", "true");
+        node.addEventListener("dragstart", handleDragStart);
+        node.addEventListener("selectstart", handleSelectStart);
+        return () => {
+            this.sourceNodes.delete(sourceId);
+            this.sourceNodeOptions.delete(sourceId);
+            node.removeEventListener("dragstart", handleDragStart);
+            node.removeEventListener("selectstart", handleSelectStart);
+            node.setAttribute("draggable", "false");
+        };
+    }
+    connectDropTarget(targetId, node) {
+        const handleDragEnter = (e) => this.handleDragEnter(e, targetId);
+        const handleDragOver = (e) => this.handleDragOver(e, targetId);
+        const handleDrop = (e) => this.handleDrop(e, targetId);
+        node.addEventListener("dragenter", handleDragEnter);
+        node.addEventListener("dragover", handleDragOver);
+        node.addEventListener("drop", handleDrop);
+        return () => {
+            node.removeEventListener("dragenter", handleDragEnter);
+            node.removeEventListener("dragover", handleDragOver);
+            node.removeEventListener("drop", handleDrop);
+        };
+    }
+    addEventListeners(target) {
+        // SSR Fix (https://github.com/react-dnd/react-dnd/pull/813
+        if (!target.addEventListener) {
+            return;
+        }
+        target.addEventListener("dragstart", this.handleTopDragStart);
+        target.addEventListener("dragstart", this.handleTopDragStartCapture, true);
+        target.addEventListener("dragend", this.handleTopDragEndCapture, true);
+        target.addEventListener("dragenter", this.handleTopDragEnter);
+        target.addEventListener("dragenter", this.handleTopDragEnterCapture, true);
+        target.addEventListener("dragleave", this.handleTopDragLeaveCapture, true);
+        target.addEventListener("dragover", this.handleTopDragOver);
+        target.addEventListener("dragover", this.handleTopDragOverCapture, true);
+        target.addEventListener("drop", this.handleTopDrop);
+        target.addEventListener("drop", this.handleTopDropCapture, true);
+    }
+    removeEventListeners(target) {
+        // SSR Fix (https://github.com/react-dnd/react-dnd/pull/813
+        if (!target.removeEventListener) {
+            return;
+        }
+        target.removeEventListener("dragstart", this.handleTopDragStart);
+        target.removeEventListener("dragstart", this.handleTopDragStartCapture, true);
+        target.removeEventListener("dragend", this.handleTopDragEndCapture, true);
+        target.removeEventListener("dragenter", this.handleTopDragEnter);
+        target.removeEventListener("dragenter", this.handleTopDragEnterCapture, true);
+        target.removeEventListener("dragleave", this.handleTopDragLeaveCapture, true);
+        target.removeEventListener("dragover", this.handleTopDragOver);
+        target.removeEventListener("dragover", this.handleTopDragOverCapture, true);
+        target.removeEventListener("drop", this.handleTopDrop);
+        target.removeEventListener("drop", this.handleTopDropCapture, true);
+    }
+    getCurrentSourceNodeOptions() {
+        const sourceId = this.monitor.getSourceId();
+        const sourceNodeOptions = this.sourceNodeOptions.get(sourceId);
+        return Object.assign({ dropEffect: this.altKeyPressed ? "copy" : "move" }, (sourceNodeOptions || {}));
+    }
+    getCurrentDropEffect() {
+        if (this.isDraggingNativeItem()) {
+            // It makes more sense to default to 'copy' for native resources
+            return "copy";
+        }
+        return this.getCurrentSourceNodeOptions().dropEffect;
+    }
+    getCurrentSourcePreviewNodeOptions() {
+        const sourceId = this.monitor.getSourceId();
+        const sourcePreviewNodeOptions = this.sourcePreviewNodeOptions.get(sourceId);
+        return Object.assign({ anchorX: 0.5, anchorY: 0.5, captureDraggingState: false }, (sourcePreviewNodeOptions || {}));
+    }
+    isDraggingNativeItem() {
+        const itemType = this.monitor.getItemType();
+        return Object.keys(NativeTypes).some((key) => NativeTypes[key] === itemType);
+    }
+    beginDragNativeItem(type, dataTransfer) {
+        this.clearCurrentDragSourceNode();
+        this.currentNativeSource = createNativeDragSource(type, dataTransfer);
+        this.currentNativeHandle = this.registry.addSource(type, this.currentNativeSource);
+        this.actions.beginDrag([this.currentNativeHandle]);
+    }
+    setCurrentDragSourceNode(node) {
+        this.clearCurrentDragSourceNode();
+        this.currentDragSourceNode = node;
+        // A timeout of > 0 is necessary to resolve Firefox issue referenced
+        // See:
+        //   * https://github.com/react-dnd/react-dnd/pull/928
+        //   * https://github.com/react-dnd/react-dnd/issues/869
+        const MOUSE_MOVE_TIMEOUT = 1000;
+        // Receiving a mouse event in the middle of a dragging operation
+        // means it has ended and the drag source node disappeared from DOM,
+        // so the browser didn't dispatch the dragend event.
+        //
+        // We need to wait before we start listening for mousemove events.
+        // This is needed because the drag preview needs to be drawn or else it fires an 'mousemove' event
+        // immediately in some browsers.
+        //
+        // See:
+        //   * https://github.com/react-dnd/react-dnd/pull/928
+        //   * https://github.com/react-dnd/react-dnd/issues/869
+        //
+        this.mouseMoveTimeoutTimer = setTimeout(() => {
+            var _a;
+            return (_a = this.rootElement) === null || _a === void 0 ? void 0 : _a.addEventListener("mousemove", this.endDragIfSourceWasRemovedFromDOM, true);
+        }, MOUSE_MOVE_TIMEOUT);
+    }
+    clearCurrentDragSourceNode() {
+        if (this.currentDragSourceNode) {
+            this.currentDragSourceNode = null;
+            if (this.rootElement && this.window) {
+                if (this.mouseMoveTimeoutTimer !== null) {
+                    if (typeof this.window.clearTimeout === "function") {
+                        this.window.clearTimeout(this.mouseMoveTimeoutTimer);
+                    }
+                    else if (typeof clearTimeout === "function") {
+                        clearTimeout(this.mouseMoveTimeoutTimer);
+                    }
+                    this.mouseMoveTimeoutTimer = null;
+                }
+                this.rootElement.removeEventListener("mousemove", this.endDragIfSourceWasRemovedFromDOM, true);
+            }
+            return true;
+        }
+        return false;
+    }
+    handleDragStart(e, sourceId) {
+        if (e.defaultPrevented) {
+            return;
+        }
+        if (!this.dragStartSourceIds) {
+            this.dragStartSourceIds = [];
+        }
+        this.dragStartSourceIds.unshift(sourceId);
+    }
+    handleDragEnter(_e, targetId) {
+        this.dragEnterTargetIds.unshift(targetId);
+    }
+    handleDragOver(_e, targetId) {
+        if (this.dragOverTargetIds === null) {
+            this.dragOverTargetIds = [];
+        }
+        this.dragOverTargetIds.unshift(targetId);
+    }
+    handleDrop(_e, targetId) {
+        this.dropTargetIds.unshift(targetId);
+    }
+}
+
+let emptyImage;
+function getEmptyImage() {
+    if (!emptyImage) {
+        emptyImage = new Image();
+        emptyImage.src =
+            'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';
+    }
+    return emptyImage;
+}
+
+const HTML5Backend = function createBackend(manager, context, options) {
     return new HTML5BackendImpl(manager, context, options);
 };
-//# sourceMappingURL=index.js.map
+
+export { HTML5Backend, NativeTypes, getEmptyImage };
+//# sourceMappingURL=index.js.map

package.json

 {
   "name": "@vizzly/dnd-backend",
+  "version": "0.0.2",
+  "description": "HTML5 backend for React DnD",
   "type": "module",
-  "version": "0.0.1",
-  "description": "HTML5 backend for React DnD",
-  "main": "./dist/bundle.cjs.js",
-  "module": "./dist/bundle.esm.js",
+  "main": "./dist/index.js",
+  "module": "./dist/index.js",
   "types": "./dist/index.d.ts",
@@ -9,0 +9,0 @@ "files": [

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