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undo-plugin.js
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undo-plugin.js
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import { Plugin, PluginKey } from 'prosemirror-state' // eslint-disable-line
import { getRelativeSelection } from './sync-plugin.js'
import { UndoManager, Item, ContentType, XmlElement, Text } from 'yjs'
import { yUndoPluginKey, ySyncPluginKey } from './keys.js'
export const undo = state => {
const undoManager = yUndoPluginKey.getState(state).undoManager
if (undoManager != null) {
undoManager.undo()
return true
}
}
export const redo = state => {
const undoManager = yUndoPluginKey.getState(state).undoManager
if (undoManager != null) {
undoManager.redo()
return true
}
}
export const yUndoPlugin = ({ protectedNodes = new Set(['paragraph']), trackedOrigins = [] } = {}) => new Plugin({
key: yUndoPluginKey,
state: {
init: (initargs, state) => {
// TODO: check if plugin order matches and fix
const ystate = ySyncPluginKey.getState(state)
const undoManager = new UndoManager(ystate.type, {
trackedOrigins: new Set([ySyncPluginKey].concat(trackedOrigins)),
deleteFilter: item => !(item instanceof Item) ||
!(item.content instanceof ContentType) ||
!(item.content.type instanceof Text ||
(item.content.type instanceof XmlElement && protectedNodes.has(item.content.type.nodeName))) ||
item.content.type._length === 0
})
return {
undoManager,
prevSel: null,
hasUndoOps: undoManager.undoStack.length > 0,
hasRedoOps: undoManager.redoStack.length > 0
}
},
apply: (tr, val, oldState, state) => {
const binding = ySyncPluginKey.getState(state).binding
const undoManager = val.undoManager
const hasUndoOps = undoManager.undoStack.length > 0
const hasRedoOps = undoManager.redoStack.length > 0
if (binding) {
return {
undoManager,
prevSel: getRelativeSelection(binding, oldState),
hasUndoOps,
hasRedoOps
}
} else {
if (hasUndoOps !== val.hasUndoOps || hasRedoOps !== val.hasRedoOps) {
return Object.assign({}, val, {
hasUndoOps: undoManager.undoStack.length > 0,
hasRedoOps: undoManager.redoStack.length > 0
})
} else { // nothing changed
return val
}
}
}
},
view: view => {
const ystate = ySyncPluginKey.getState(view.state)
const undoManager = yUndoPluginKey.getState(view.state).undoManager
undoManager.on('stack-item-added', ({ stackItem }) => {
const binding = ystate.binding
if (binding) {
stackItem.meta.set(binding, yUndoPluginKey.getState(view.state).prevSel)
}
})
undoManager.on('stack-item-popped', ({ stackItem }) => {
const binding = ystate.binding
if (binding) {
binding.beforeTransactionSelection = stackItem.meta.get(binding) || binding.beforeTransactionSelection
}
})
return {
destroy: () => {
undoManager.destroy()
}
}
}
})