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const Popover = {
name: 'Popover',
props: {
// Action to trigger popover: either 'hover' or 'click'
trigger: String,
// Either 'top' or 'bottom'
placement: String,
// Takes object with properties 'x' and 'y', values of these can be
// 'container' for using offsetParent as boundaries for either axis
// or 'viewport'
boundTo: Object,
// Takes a top/bottom/left/right object, how much space to leave
// between boundary and popover element
margin: Object,
// Takes a x/y object and tells how many pixels to offset from
// anchor point on either axis
offset: Object,
// Additional styles you may want for the popover container
popoverClass: String
},
data () {
return {
hidden: true,
styles: { opacity: 0 },
oldSize: { width: 0, height: 0 }
}
},
methods: {
updateStyles () {
if (this.hidden) {
this.styles = {
opacity: 0
}
return
}
// Popover will be anchored around this element, trigger ref is the container, so
// its children are what are inside the slot. Expect only one slot="trigger".
const anchorEl = (this.$refs.trigger && this.$refs.trigger.children[0]) || this.$el
const screenBox = anchorEl.getBoundingClientRect()
// Screen position of the origin point for popover
const origin = { x: screenBox.left + screenBox.width * 0.5, y: screenBox.top }
const content = this.$refs.content
// Minor optimization, don't call a slow reflow call if we don't have to
const parentBounds = this.boundTo &&
(this.boundTo.x === 'container' || this.boundTo.y === 'container') &&
this.$el.offsetParent.getBoundingClientRect()
const margin = this.margin || {}
// What are the screen bounds for the popover? Viewport vs container
// when using viewport, using default margin values to dodge the navbar
const xBounds = this.boundTo && this.boundTo.x === 'container' ? {
min: parentBounds.left + (margin.left || 0),
max: parentBounds.right - (margin.right || 0)
} : {
min: 0 + (margin.left || 10),
max: window.innerWidth - (margin.right || 10)
}
const yBounds = this.boundTo && this.boundTo.y === 'container' ? {
min: parentBounds.top + (margin.top || 0),
max: parentBounds.bottom - (margin.bottom || 0)
} : {
min: 0 + (margin.top || 50),
max: window.innerHeight - (margin.bottom || 5)
}
let horizOffset = 0
// If overflowing from left, move it so that it doesn't
if ((origin.x - content.offsetWidth * 0.5) < xBounds.min) {
horizOffset += -(origin.x - content.offsetWidth * 0.5) + xBounds.min
}
// If overflowing from right, move it so that it doesn't
if ((origin.x + horizOffset + content.offsetWidth * 0.5) > xBounds.max) {
horizOffset -= (origin.x + horizOffset + content.offsetWidth * 0.5) - xBounds.max
}
// Default to whatever user wished with placement prop
let usingTop = this.placement !== 'bottom'
// Handle special cases, first force to displaying on top if there's not space on bottom,
// regardless of what placement value was. Then check if there's not space on top, and
// force to bottom, again regardless of what placement value was.
if (origin.y + content.offsetHeight > yBounds.max) usingTop = true
if (origin.y - content.offsetHeight < yBounds.min) usingTop = false
const yOffset = (this.offset && this.offset.y) || 0
const translateY = usingTop
? -anchorEl.offsetHeight - yOffset - content.offsetHeight
: yOffset
const xOffset = (this.offset && this.offset.x) || 0
const translateX = (anchorEl.offsetWidth * 0.5) - content.offsetWidth * 0.5 + horizOffset + xOffset
// Note, separate translateX and translateY avoids blurry text on chromium,
// single translate or translate3d resulted in blurry text.
this.styles = {
opacity: 1,
transform: `translateX(${Math.floor(translateX)}px) translateY(${Math.floor(translateY)}px)`
}
},
showPopover () {
if (this.hidden) this.$emit('show')
this.hidden = false
this.$nextTick(this.updateStyles)
},
hidePopover () {
if (!this.hidden) this.$emit('close')
this.hidden = true
this.styles = { opacity: 0 }
},
onMouseenter (e) {
if (this.trigger === 'hover') this.showPopover()
},
onMouseleave (e) {
if (this.trigger === 'hover') this.hidePopover()
},
onClick (e) {
if (this.trigger === 'click') {
if (this.hidden) {
this.showPopover()
} else {
this.hidePopover()
}
}
},
onClickOutside (e) {
if (this.hidden) return
if (this.$el.contains(e.target)) return
this.hidePopover()
}
},
updated () {
// Monitor changes to content size, update styles only when content sizes have changed,
// that should be the only time we need to move the popover box if we don't care about scroll
// or resize
const content = this.$refs.content
if (!content) return
if (this.oldSize.width !== content.offsetWidth || this.oldSize.height !== content.offsetHeight) {
this.updateStyles()
this.oldSize = { width: content.offsetWidth, height: content.offsetHeight }
}
},
created () {
document.addEventListener('click', this.onClickOutside)
},
destroyed () {
document.removeEventListener('click', this.onClickOutside)
this.hidePopover()
}
}
export default Popover
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