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element-plus

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A Component Library for Vue 3

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{"version":3,"file":"useDragNode.mjs","sources":["../../../../../../../packages/components/tree/src/model/useDragNode.ts"],"sourcesContent":["import { provide, ref } from 'vue'\nimport { addClass, isFunction, removeClass } from '@element-plus/utils'\nimport { useNamespace } from '@element-plus/hooks'\n\nimport type { InjectionKey, Ref, SetupContext } from 'vue'\nimport type {\n AllowDragFunction,\n AllowDropFunction,\n FakeNode,\n NodeDropType,\n} from '../tree.type'\nimport type TreeStore from './tree-store'\nimport type Node from './node'\nimport type { treeEmits } from '../tree'\n\nexport interface TreeNode {\n node: Node\n $el?: HTMLElement\n}\n\ninterface DragOptions {\n event: DragEvent\n treeNode: TreeNode\n}\n\ninterface Props {\n props: {\n allowDrag?: AllowDragFunction\n allowDrop?: AllowDropFunction\n }\n ctx: SetupContext<typeof treeEmits>\n el$: Ref<HTMLElement | null>\n dropIndicator$: Ref<HTMLElement | null>\n store: Ref<TreeStore>\n}\n\nexport interface DragEvents {\n treeNodeDragStart: (options: DragOptions) => void\n treeNodeDragOver: (options: DragOptions) => void\n treeNodeDragEnd: (event: DragEvent) => void\n}\n\nexport const dragEventsKey: InjectionKey<DragEvents> = Symbol('dragEvents')\n\nexport function useDragNodeHandler({\n props,\n ctx,\n el$,\n dropIndicator$,\n store,\n}: Props) {\n const ns = useNamespace('tree')\n const dragState = ref<{\n allowDrop: boolean\n dropType: NodeDropType | null\n draggingNode: TreeNode | null\n showDropIndicator: boolean\n dropNode: TreeNode | null\n }>({\n showDropIndicator: false,\n draggingNode: null,\n dropNode: null,\n allowDrop: true,\n dropType: null,\n })\n\n const treeNodeDragStart = ({ event, treeNode }: DragOptions) => {\n if (!event.dataTransfer) return\n if (isFunction(props.allowDrag) && !props.allowDrag(treeNode.node)) {\n event.preventDefault()\n return false\n }\n event.dataTransfer.effectAllowed = 'move'\n\n // wrap in try catch to address IE's error when first param is 'text/plain'\n try {\n // setData is required for draggable to work in FireFox\n // the content has to be '' so dragging a node out of the tree won't open a new tab in FireFox\n event.dataTransfer.setData('text/plain', '')\n } catch {}\n dragState.value.draggingNode = treeNode\n ctx.emit('node-drag-start', treeNode.node, event)\n }\n\n const treeNodeDragOver = ({ event, treeNode }: DragOptions) => {\n if (!event.dataTransfer) return\n const dropNode = treeNode\n const oldDropNode = dragState.value.dropNode\n if (oldDropNode && oldDropNode.node.id !== dropNode.node.id) {\n removeClass(oldDropNode.$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 (isFunction(props.allowDrop)) {\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 } else {\n // Reset dragState.value.dropNode to null when allowDrop is transfer from true to false.(For issue #14704)\n dragState.value.dropNode = null\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 const dropEl = dropNode.$el!\n\n // find target node without children, just calc content node height\n const targetPosition = dropEl\n .querySelector(`.${ns.be('node', 'content')}`)!\n .getBoundingClientRect()\n const treePosition = el$.value!.getBoundingClientRect()\n const treeScrollTop = el$.value!.scrollTop\n let dropType: NodeDropType\n const prevPercent = dropPrev\n ? dropInner\n ? 0.25\n : dropNext\n ? 0.45\n : 1\n : Number.NEGATIVE_INFINITY\n const nextPercent = dropNext\n ? dropInner\n ? 0.75\n : dropPrev\n ? 0.55\n : 0\n : Number.POSITIVE_INFINITY\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 = dropEl\n .querySelector(`.${ns.be('node', 'expand-icon')}`)!\n .getBoundingClientRect()\n const dropIndicator = dropIndicator$.value\n if (dropType === 'before') {\n indicatorTop = iconPosition.top - treePosition.top + treeScrollTop\n } else if (dropType === 'after') {\n indicatorTop = iconPosition.bottom - treePosition.top + treeScrollTop\n }\n dropIndicator!.style.top = `${indicatorTop}px`\n dropIndicator!.style.left = `${iconPosition.right - treePosition.left}px`\n\n if (dropType === 'inner') {\n addClass(dropEl, ns.is('drop-inner'))\n } else {\n removeClass(dropEl, 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\n // https://bugzilla.mozilla.org/show_bug.cgi?id=1911486\n if (event.dataTransfer) {\n event.dataTransfer.dropEffect = 'move'\n }\n\n if (draggingNode?.node.data && dropNode) {\n const draggingNodeCopy: FakeNode = { 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 as any)\n if (store.value.key) {\n //restore checkbox state after dragging\n draggingNode.node.eachNode((node) => {\n store.value.nodesMap[node.data[store.value.key]]?.setChecked(\n node.checked,\n !store.value.checkStrictly\n )\n })\n }\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(\n 'node-drop',\n draggingNode.node,\n dropNode.node,\n dropType!,\n event\n )\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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