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