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import { Plugin, PluginKey } from 'prosemirror-state'
function textRange(node, from, to) {
const range = document.createRange()
range.setEnd(node, to == null ? node.nodeValue.length : to)
range.setStart(node, Math.max(from, 0))
return range
}
function singleRect(object, bias) {
const rects = object.getClientRects()
return !rects.length ? object.getBoundingClientRect() : rects[bias < 0 ? 0 : rects.length - 1]
}
function coordsAtPos(view, pos, end = false) {
const { node, offset } = view.docView.domFromPos(pos)
let side
let rect
if (node.nodeType === 3) {
if (end && offset < node.nodeValue.length) {
rect = singleRect(textRange(node, offset - 1, offset), -1)
side = 'right'
} else if (offset < node.nodeValue.length) {
rect = singleRect(textRange(node, offset, offset + 1), -1)
side = 'left'
}
} else if (node.firstChild) {
if (offset < node.childNodes.length) {
const child = node.childNodes[offset]
rect = singleRect(child.nodeType === 3 ? textRange(child) : child, -1)
side = 'left'
}
if ((!rect || rect.top === rect.bottom) && offset) {
const child = node.childNodes[offset - 1]
rect = singleRect(child.nodeType === 3 ? textRange(child) : child, 1)
side = 'right'
}
} else {
rect = node.getBoundingClientRect()
side = 'left'
}
const x = rect[side]
return {
top: rect.top,
bottom: rect.bottom,
left: x,
right: x,
}
}
class Menu {
constructor({ options, editorView }) {
this.options = {
...{
element: null,
keepInBounds: true,
onUpdate: () => false,
},
...options,
}
this.editorView = editorView
this.isActive = false
this.left = 0
this.bottom = 0
this.top = 0
this.preventHide = false
// the mousedown event is fired before blur so we can prevent it
this.mousedownHandler = this.handleClick.bind(this)
this.options.element.addEventListener('mousedown', this.mousedownHandler, { capture: true })
this.focusHandler = ({ view }) => {
this.update(view)
}
this.options.editor.on('focus', this.focusHandler)
this.blurHandler = ({ event }) => {
if (this.preventHide) {
this.preventHide = false
return
}
this.hide(event)
}
this.options.editor.on('blur', this.blurHandler)
}
handleClick() {
this.preventHide = true
}
update(view, lastState) {
const { state } = view
if (view.composing) {
return
}
// Don't do anything if the document/selection didn't change
if (lastState && lastState.doc.eq(state.doc) && lastState.selection.eq(state.selection)) {
return
}
// Hide the tooltip if the selection is empty
if (state.selection.empty) {
this.hide()
return
}
// Otherwise, reposition it and update its content
const { from, to } = state.selection
// These are in screen coordinates
// We can't use EditorView.cordsAtPos here because it can't handle linebreaks correctly
// See: https://github.com/ProseMirror/prosemirror-view/pull/47
const start = coordsAtPos(view, from)
const end = coordsAtPos(view, to, true)
// The box in which the tooltip is positioned, to use as base
const parent = this.options.element.offsetParent
if (!parent) {
this.hide()
return
}
const box = parent.getBoundingClientRect()
const el = this.options.element.getBoundingClientRect()
// Find a center-ish x position from the selection endpoints (when
// crossing lines, end may be more to the left)
const left = ((start.left + end.left) / 2) - box.left
// Keep the menuBubble in the bounding box of the offsetParent i
this.left = Math.round(this.options.keepInBounds
? Math.min(box.width - (el.width / 2), Math.max(left, el.width / 2)) : left)
this.bottom = Math.round(box.bottom - start.top)
this.top = Math.round(end.bottom - box.top)
this.isActive = true
this.sendUpdate()
}
sendUpdate() {
this.options.onUpdate({
isActive: this.isActive,
left: this.left,
bottom: this.bottom,
top: this.top,
})
}
hide(event) {
if (event
&& event.relatedTarget
&& this.options.element.parentNode
&& this.options.element.parentNode.contains(event.relatedTarget)
) {
return
}
this.isActive = false
this.sendUpdate()
}
destroy() {
this.options.element.removeEventListener('mousedown', this.mousedownHandler)
this.options.editor.off('focus', this.focusHandler)
this.options.editor.off('blur', this.blurHandler)
}
}
export default function (options) {
return new Plugin({
key: new PluginKey('menu_bubble'),
view(editorView) {
return new Menu({ editorView, options })
},
})
}