{"version":3,"file":"useDragNode.mjs","sources":["../../../../../../../packages/components/tree/src/model/useDragNode.ts"],"sourcesContent":["// @ts-nocheck\nimport { provide, ref } from 'vue'\nimport { addClass, removeClass } from '@element-plus/utils'\nimport { useNamespace } from '@element-plus/hooks'\nimport type { InjectionKey } from 'vue'\nimport type Node from './node'\nimport type { NodeDropType } from '../tree.type'\n\ninterface TreeNode {\n node: Node\n $el?: HTMLElement\n}\n\ninterface DragOptions {\n event: DragEvent\n treeNode: TreeNode\n}\n\nexport interface DragEvents {\n treeNodeDragStart: (options: DragOptions) => void\n treeNodeDragOver: (options: DragOptions) => void\n treeNodeDragEnd: (event: DragEvent) => void\n}\n\nexport const dragEventsKey: InjectionKey<DragEvents> = Symbol('dragEvents')\n\nexport function useDragNodeHandler({ props, ctx, el$, dropIndicator$, store }) {\n const ns = useNamespace('tree')\n const dragState = ref({\n showDropIndicator: false,\n draggingNode: null,\n dropNode: null,\n allowDrop: true,\n dropType: null,\n })\n\n const treeNodeDragStart = ({ event, treeNode }: DragOptions) => {\n if (\n typeof props.allowDrag === 'function' &&\n !props.allowDrag(treeNode.node)\n ) {\n event.preventDefault()\n return false\n }\n event.dataTransfer.effectAllowed = 'move'\n\n // wrap in try catch to address IE's error when first param is 'text/plain'\n try {\n // setData is required for draggable to work in FireFox\n // the content has to be '' so dragging a node out of the tree won't open a new tab in FireFox\n event.dataTransfer.setData('text/plain', '')\n } catch {}\n dragState.value.draggingNode = treeNode\n ctx.emit('node-drag-start', treeNode.node, event)\n }\n\n const treeNodeDragOver = ({ event, treeNode }: DragOptions) => {\n const dropNode = treeNode\n const oldDropNode = dragState.value.dropNode\n if (oldDropNode && oldDropNode.node.id !== dropNode.node.id) {\n removeClass(oldDropNode.$el, ns.is('drop-inner'))\n }\n const draggingNode = dragState.value.draggingNode\n if (!draggingNode || !dropNode) return\n\n let dropPrev = true\n let dropInner = true\n let dropNext = true\n let userAllowDropInner = true\n if (typeof props.allowDrop === 'function') {\n dropPrev = props.allowDrop(draggingNode.node, dropNode.node, 'prev')\n userAllowDropInner = dropInner = props.allowDrop(\n draggingNode.node,\n dropNode.node,\n 'inner'\n )\n dropNext = props.allowDrop(draggingNode.node, dropNode.node, 'next')\n }\n event.dataTransfer.dropEffect =\n dropInner || dropPrev || dropNext ? 'move' : 'none'\n if (\n (dropPrev || dropInner || dropNext) &&\n oldDropNode?.node.id !== dropNode.node.id\n ) {\n if (oldDropNode) {\n ctx.emit('node-drag-leave', draggingNode.node, oldDropNode.node, event)\n }\n ctx.emit('node-drag-enter', draggingNode.node, dropNode.node, event)\n }\n\n if (dropPrev || dropInner || dropNext) {\n dragState.value.dropNode = dropNode\n }\n\n if (dropNode.node.nextSibling === draggingNode.node) {\n dropNext = false\n }\n if (dropNode.node.previousSibling === draggingNode.node) {\n dropPrev = false\n }\n if (dropNode.node.contains(draggingNode.node, false)) {\n dropInner = false\n }\n if (\n draggingNode.node === dropNode.node ||\n draggingNode.node.contains(dropNode.node)\n ) {\n dropPrev = false\n dropInner = false\n dropNext = false\n }\n\n const targetPosition = dropNode.$el.getBoundingClientRect()\n const treePosition = el$.value.getBoundingClientRect()\n\n let dropType: NodeDropType\n const prevPercent = dropPrev ? (dropInner ? 0.25 : dropNext ? 0.45 : 1) : -1\n const nextPercent = dropNext ? (dropInner ? 0.75 : dropPrev ? 0.55 : 0) : 1\n\n let indicatorTop = -9999\n const distance = event.clientY - targetPosition.top\n if (distance < targetPosition.height * prevPercent) {\n dropType = 'before'\n } else if (distance > targetPosition.height * nextPercent) {\n dropType = 'after'\n } else if (dropInner) {\n dropType = 'inner'\n } else {\n dropType = 'none'\n }\n\n const iconPosition = dropNode.$el\n .querySelector(`.${ns.be('node', 'expand-icon')}`)\n .getBoundingClientRect()\n const dropIndicator = dropIndicator$.value\n if (dropType === 'before') {\n indicatorTop = iconPosition.top - treePosition.top\n } else if (dropType === 'after') {\n indicatorTop = iconPosition.bottom - treePosition.top\n }\n dropIndicator.style.top = `${indicatorTop}px`\n dropIndicator.style.left = `${iconPosition.right - treePosition.left}px`\n\n if (dropType === 'inner') {\n addClass(dropNode.$el, ns.is('drop-inner'))\n } else {\n removeClass(dropNode.$el, ns.is('drop-inner'))\n }\n\n dragState.value.showDropIndicator =\n dropType === 'before' || dropType === 'after'\n dragState.value.allowDrop =\n dragState.value.showDropIndicator || userAllowDropInner\n dragState.value.dropType = dropType\n ctx.emit('node-drag-over', draggingNode.node, dropNode.node, event)\n }\n\n const treeNodeDragEnd = (event: DragEvent) => {\n const { draggingNode, dropType, dropNode } = dragState.value\n event.preventDefault()\n event.dataTransfer.dropEffect = 'move'\n\n if (draggingNode && dropNode) {\n const draggingNodeCopy = { data: draggingNode.node.data }\n if (dropType !== 'none') {\n draggingNode.node.remove()\n }\n if (dropType === 'before') {\n dropNode.node.parent.insertBefore(draggingNodeCopy, dropNode.node)\n } else if (dropType === 'after') {\n dropNode.node.parent.insertAfter(draggingNodeCopy, dropNode.node)\n } else if (dropType === 'inner') {\n dropNode.node.insertChild(draggingNodeCopy)\n }\n if (dropType !== 'none') {\n store.value.registerNode(draggingNodeCopy)\n }\n\n removeClass(dropNode.$el, ns.is('drop-inner'))\n\n ctx.emit(\n 'node-drag-end',\n draggingNode.node,\n dropNode.node,\n dropType,\n event\n )\n if (dropType !== 'none') {\n ctx.emit('node-drop', draggingNode.node, dropNode.node, dropType, event)\n }\n }\n if (draggingNode && !dropNode) {\n ctx.emit('node-drag-end', draggingNode.node, null, dropType, event)\n }\n\n dragState.value.showDropIndicator = false\n dragState.value.draggingNode = null\n dragState.value.dropNode = null\n dragState.value.allowDrop = true\n }\n\n provide(dragEventsKey, {\n treeNodeDragStart,\n treeNodeDragOver,\n treeNodeDragEnd,\n })\n\n return {\n dragState,\n 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