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1×
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1×
| //
//
//
//
//
//
//
//
import {getWidth} from '../utils'
import keycode from 'keycode'
import clickoutside from '../internal/clickoutside'
export default {
name: 'mu-menu',
props: {
desktop: {
type: Boolean,
default: false
},
multiple: {
type: Boolean,
default: false
},
autoWidth: {
type: Boolean,
default: true
},
width: {
type: [String, Number]
},
maxHeight: {
type: Number
},
disableAutoFocus: {
type: Boolean,
default: false
},
initiallyKeyboardFocused: {
type: Boolean,
default: false
},
// 内部使用，是否是弹出菜单
popover: {
type: Boolean,
default: false
},
value: {}
},
data () {
return {
focusIndex: -1,
isKeyboardFocused: false
}
},
computed: {
keyWidth () {
return this.desktop ? 64 : 56
},
contentWidth () {
return this.autoWidth ? '' : getWidth(this.width)
}
},
mounted () {
this.setWidth()
const selectedIndex = this.getSelectedIndex()
this.setScollPosition()
this.focusIndex = this.disableAutoFocus ? -1 : selectedIndex >= 0 ? selectedIndex : this.initiallyKeyboardFocused ? 0 : -1
this.isKeyboardFocused = this.initiallyKeyboardFocused
if (this.popover) this.$el.focus()
},
beforeUpdate () {
const selectedIndex = this.getSelectedIndex()
this.focusIndex = this.disableAutoFocus ? -1 : selectedIndex >= 0 ? selectedIndex : 0
},
updated () {
this.setWidth()
},
methods: {
clickoutside () {
this.setFocusIndex(-1, false)
},
setWidth () {
if (!this.autoWidth) return
const el = this.$el
const listEl = this.$refs.list
const elWidth = el.offsetWidth
if (elWidth === 0) return // 被隐藏时不计算宽度
const keyWidth = this.keyWidth
const minWidth = keyWidth * 1.5
let keyIncrements = elWidth / keyWidth
let newWidth
keyIncrements = keyIncrements <= 1.5 ? 1.5 : Math.ceil(keyIncrements)
newWidth = keyIncrements * keyWidth
if (newWidth < minWidth) newWidth = minWidth
el.style.width = `${newWidth}px`
listEl.style.width = `${newWidth}px`
},
handleChange (value) {
this.$emit('change', value)
},
handleClick (item) {
this.$emit('itemClick', item)
},
handleKeydown (event) {
const key = keycode(event)
switch (key) {
case 'down':
event.stopPropagation() // 防止菜单嵌套
event.preventDefault()
this.incrementKeyboardFocusIndex()
break
case 'tab':
event.stopPropagation()
event.preventDefault()
if (event.shiftKey) {
this.decrementKeyboardFocusIndex()
} else {
this.incrementKeyboardFocusIndex()
}
break
case 'up':
event.stopPropagation()
event.preventDefault()
this.decrementKeyboardFocusIndex()
break
}
},
decrementKeyboardFocusIndex () {
let index = this.focusIndex
const maxIndex = this.getMenuItemCount() - 1
index--
if (index < 0) index = maxIndex
this.setFocusIndex(index, true)
},
incrementKeyboardFocusIndex () {
let index = this.focusIndex
const maxIndex = this.getMenuItemCount() - 1
index++
if (index > maxIndex) index = 0
this.setFocusIndex(index, true)
},
getMenuItemCount () {
let menuItemCount = 0
this.$children.forEach((child) => {
if (child._isMenuItem && !child.disabled) menuItemCount++
})
return menuItemCount
},
getSelectedIndex () {
let selectedIndex = -1
let menuItemIndex = 0
this.$children.forEach((child) => {
if (child.active) selectedIndex = menuItemIndex
if (child._isMenuItem && !child.disabled) menuItemIndex++
})
return selectedIndex
},
setFocusIndex (newIndex, isKeyboardFocused) {
this.focusIndex = newIndex
this.isKeyboardFocused = isKeyboardFocused
},
setScollPosition (selectedIndex) {
const desktop = this.desktop
let focusedMenuItem = null
this.$children.forEach((child) => {
if (child.active) focusedMenuItem = child
})
const menuItemHeight = desktop ? 32 : 48
if (focusedMenuItem) {
const selectedOffSet = focusedMenuItem.$el.offsetTop
// Make the focused item be the 2nd item in the list the user sees
let scrollTop = selectedOffSet - menuItemHeight
if (scrollTop < menuItemHeight) scrollTop = 0
this.$refs.list.scrollTop = scrollTop
}
}
},
watch: {
focusIndex (newVal, oldVal) {
if (newVal === oldVal) return
let menuItemIndex = 0
this.$children.forEach((child) => {
if (!child._isMenuItem || child.disabled) return
const isFocused = menuItemIndex === newVal
let focusState = 'none'
if (isFocused) {
focusState = this.isKeyboardFocused ? 'keyboard-focused' : 'focused'
}
child.focusState = focusState
menuItemIndex++
})
}
},
directives: {
clickoutside
}
}
|