import Vue from 'vue'
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// 自定义元素实现弹框拖拽[重点]
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Vue.directive('draw', {
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// inserted: function (el, binding, vNode) {
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// el.setAttribute('style', 'position: fixed; z-index: 9999')
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// },
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bind: function (el, bindding, vNode) {
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el.setAttribute('draggable', true)
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let left, top, width, height
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el._dragstart = function (event) {
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event.stopPropagation()
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left = event.clientX - el.offsetLeft
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top = event.clientY - el.offsetTop
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width = el.offsetWidth
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height = el.offsetHeight
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}
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el._checkPosition = function () { // 防止被拖出边界
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const width = el.offsetWidth
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const height = el.offsetHeight
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let left = Math.min(el.offsetLeft, document.body.clientWidth - width)
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left = Math.max(0, left)
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let top = Math.min(el.offsetTop, document.body.clientHeight - height)
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top = Math.max(0, top)
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el.style.left = left + 'px'
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el.style.top = top + 'px'
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el.style.width = width + 'px'
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el.style.height = height + 'px'
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}
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el._dragEnd = function (event) {
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event.stopPropagation()
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left = event.clientX - left
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top = event.clientY - top
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el.style.left = left + 'px'
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el.style.top = top + 'px'
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el.style.width = width + 'px'
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el.style.height = height + 'px'
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el._checkPosition()
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}
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el._documentAllowDraop = function (event) {
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event.preventDefault()
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}
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document.body.addEventListener('dragover', el._documentAllowDraop)
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el.addEventListener('dragstart', el._dragstart)
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el.addEventListener('dragend', el._dragEnd)
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window.addEventListener('resize', el._checkPosition)
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},
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unbind: function (el, bindding, vNode) {
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document.body.removeEventListener('dragover', el._documentAllowDraop)
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el.removeEventListener('dragstart', el._dragstart)
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el.removeEventListener('dragend', el._dragEnd)
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window.removeEventListener('resize', el._checkPosition)
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delete el._documentAllowDraop
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delete el._dragstart
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delete el._dragEnd
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delete el._checkPosition
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}
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})
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