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feat: support drag&drop element from the left panel to the canvas; !#…
…: 支持从左侧元素列表中拖拽元素至中间画布
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| /* | ||
| * @Author: ly525 | ||
| * @Date: 2020-05-17 17:21:04 | ||
| * @LastEditors: ly525 | ||
| * @LastEditTime: 2020-05-24 18:09:23 | ||
| * @FilePath: /luban-h5/front-end/h5/src/components/core/editor/drag-mixin.js | ||
| * @Github: https://github.com/ly525/luban-h5 | ||
| * @Copyright 2018 - 2019 luban-h5. All Rights Reserved | ||
| * @Description: | ||
| * 组件拖拽至画布功能 | ||
| * 其中部分代码参考自：https://github.com/hakubox/haku-form-design，已经征得作者同意，目的是后续考虑做 tab 之类的嵌套容器 | ||
| */ | ||
|
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| let dragDom = null | ||
|
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| let dragConfig = { | ||
| isPreDrag: false, // 准备拖拽 | ||
| isDrag: false, // 正式拖拽 | ||
| origin: { | ||
| clientY: 0, // 鼠标按下时候时候值 | ||
| clientX: 0, | ||
| layerX: 0, // 鼠标.x 相对于元素左上角.left 的偏移 | ||
| layerY: 0 // 鼠标.y 相对于元素左上角.top 的偏移 | ||
| } | ||
| } | ||
|
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| class Drag { | ||
| constructor (options) { | ||
| this.mousedown = options.mousedown | ||
| this.mousemove = options.mousemove | ||
| this.mouseup = options.mouseup | ||
|
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||
| this._mousedown = this._mousedown.bind(this) | ||
| this._mousemove = this._mousemove.bind(this) | ||
| this._mouseup = this._mouseup.bind(this) | ||
| } | ||
|
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||
| start (e) { | ||
| this._mousedown(e) | ||
| } | ||
|
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| _mousedown (e) { | ||
| this.mousedown(e) | ||
| this.toggleListener('add') | ||
| } | ||
|
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| _mousemove (e) { | ||
| console.log('mousemove') | ||
| this.mousemove(e) | ||
| } | ||
|
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| _mouseup (e) { | ||
| console.log('mouseup') | ||
| this.mouseup(e) | ||
| this.toggleListener('remove') | ||
| } | ||
|
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| toggleListener (action) { | ||
| document[`${action}EventListener`]('mousemove', this._mousemove) | ||
| document[`${action}EventListener`]('mouseup', this._mouseup) | ||
| } | ||
| } | ||
|
|
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| export default { | ||
| data () { | ||
| return { | ||
|
|
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| } | ||
| }, | ||
| methods: { | ||
| /** | ||
| * | ||
| * @param {*} element | ||
| * @param {*} e | ||
| */ | ||
| handleDragStartFromMixin (element, e) { | ||
| // https://developer.mozilla.org/zh-CN/docs/Web/API/event.button | ||
| // 0 为 左键点击. | ||
| if (e.button !== 0) return | ||
| if (dragDom) { | ||
| document.body.removeChild(dragDom) | ||
| dragDom = null | ||
| } | ||
| this.dragElement = element | ||
| dragDom = e.target.cloneNode(true) | ||
| document.body.appendChild(dragDom) | ||
|
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| new Drag({ | ||
| mousedown: this.mousedown, | ||
| mousemove: this.mousemove, | ||
| mouseup: this.mouseup | ||
| }).start(e) | ||
| }, | ||
| /** | ||
| * | ||
| * @param {*} e | ||
| */ | ||
| mousedown (e) { | ||
| // 鼠标.x 相对于元素左上角 的偏移 | ||
| const { layerX, layerY } = e | ||
| dragConfig.origin.layerX = layerX | ||
| dragConfig.origin.layerY = layerY | ||
| dragConfig.origin.clientX = e.clientX | ||
| dragConfig.origin.clientY = e.clientY | ||
|
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||
| dragDom.style.position = 'absolute' | ||
| dragDom.style.left = e.clientX - layerX + 'px' | ||
| dragDom.style.top = e.clientY - layerY + 'px' | ||
| dragDom.classList.add('dragging-dom-ele', 'hidden') | ||
|
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| dragConfig.isPreDrag = true | ||
| }, | ||
| /** 组件拖拽中 */ | ||
| mousemove (e) { | ||
| dragDom.classList.remove('hidden') | ||
| const { layerX, layerY } = dragConfig.origin | ||
| dragDom.style.left = e.clientX - layerX + 'px' | ||
| dragDom.style.top = e.clientY - layerY + 'px' | ||
| }, | ||
| mouseup (e) { | ||
| const { layerX, layerY } = dragConfig.origin | ||
| document.body.removeChild(dragDom) | ||
| dragDom = null | ||
|
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| const canvasWrapper = document.querySelector('.canvas-wrapper') | ||
| const position = canvasWrapper.getBoundingClientRect() | ||
| this.dragElement && this.clone({ | ||
| ...this.dragElement, | ||
| customStyle: { | ||
| left: e.clientX - layerX - position.left, | ||
| top: e.clientY - layerY - position.top | ||
| } | ||
| }) | ||
| } | ||
| }, | ||
| updated () { | ||
| console.log('updated') | ||
| } | ||
| } |
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