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Add EditHistory, wire META+Z to undo last change
refs #149 * Tests for walkAllLeafSections, undo. fixes bug in walkAllLeafSections when markup section follows list section * add FixedQueue * Used FixedQueue in EditHistory, undo and redo stacks * Editor uses undoDepth option to configure depth of undo stack * Document undoDepth option
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| import mobiledocParsers from 'mobiledoc-kit/parsers/mobiledoc'; | ||
| import Range from 'mobiledoc-kit/utils/cursor/range'; | ||
| import Position from 'mobiledoc-kit/utils/cursor/position'; | ||
| import FixedQueue from 'mobiledoc-kit/utils/fixed-queue'; | ||
|
|
||
| function findLeafSectionAtIndex(post, index) { | ||
| let section; | ||
| post.walkAllLeafSections((_section, _index) => { | ||
| if (index === _index) { | ||
| section = _section; | ||
| } | ||
| }); | ||
| return section; | ||
| } | ||
|
|
||
| export class Snapshot { | ||
| constructor(editor) { | ||
| this.mobiledoc = editor.serialize(); | ||
| this.editor = editor; | ||
|
|
||
| this.snapshotRange(); | ||
| } | ||
|
|
||
| snapshotRange() { | ||
| let { range, cursor } = this.editor; | ||
| if (cursor.hasCursor()) { | ||
| let { head, tail } = range; | ||
| this.range = { | ||
| head: [head.leafSectionIndex, head.offset], | ||
| tail: [tail.leafSectionIndex, tail.offset] | ||
| }; | ||
| } | ||
| } | ||
|
|
||
| getRange(post) { | ||
| if (this.range) { | ||
| let { head, tail } = this.range; | ||
| let [headLeafSectionIndex, headOffset] = head; | ||
| let [tailLeafSectionIndex, tailOffset] = tail; | ||
| let headSection = findLeafSectionAtIndex(post, headLeafSectionIndex); | ||
| let tailSection = findLeafSectionAtIndex(post, tailLeafSectionIndex); | ||
|
|
||
| return new Range(new Position(headSection, headOffset), | ||
| new Position(tailSection, tailOffset)); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| export default class EditHistory { | ||
| constructor(editor, queueLength) { | ||
| this.editor = editor; | ||
| this._undoStack = new FixedQueue(queueLength); | ||
| this._redoStack = new FixedQueue(queueLength); | ||
|
|
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| this._pendingSnapshot = null; | ||
| } | ||
|
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| snapshot() { | ||
| // update the current snapshot with the range read from DOM | ||
| if (this._pendingSnapshot) { | ||
| this._pendingSnapshot.snapshotRange(); | ||
| } | ||
| } | ||
|
|
||
| storeSnapshot() { | ||
| // store pending snapshot | ||
| if (this._pendingSnapshot) { | ||
| this._undoStack.push(this._pendingSnapshot); | ||
| this._redoStack.clear(); | ||
| } | ||
|
|
||
| // take new pending snapshot to store next time `storeSnapshot` is called | ||
| this._pendingSnapshot = new Snapshot(this.editor); | ||
| } | ||
|
|
||
| stepBackward(postEditor) { | ||
| // Throw away the pending snapshot | ||
| this._pendingSnapshot = null; | ||
|
|
||
| let snapshot = this._undoStack.pop(); | ||
| if (snapshot) { | ||
| this._redoStack.push(new Snapshot(this.editor)); | ||
| this._restoreFromSnapshot(snapshot, postEditor); | ||
| } | ||
| } | ||
|
|
||
| stepForward(postEditor) { | ||
| let snapshot = this._redoStack.pop(); | ||
| if (snapshot) { | ||
| this._undoStack.push(new Snapshot(this.editor)); | ||
| this._restoreFromSnapshot(snapshot, postEditor); | ||
| } | ||
| postEditor.cancelSnapshot(); | ||
| } | ||
|
|
||
| _restoreFromSnapshot(snapshot, postEditor) { | ||
| let { mobiledoc } = snapshot; | ||
| let { editor } = this; | ||
| let { builder, post } = editor; | ||
| let restoredPost = mobiledocParsers.parse(builder, mobiledoc); | ||
|
|
||
| // remove existing sections | ||
| post.sections.toArray().forEach(section => { | ||
| postEditor.removeSection(section); | ||
| }); | ||
|
|
||
| // append restored sections | ||
| restoredPost.sections.toArray().forEach(section => { | ||
| restoredPost.sections.remove(section); | ||
| postEditor.insertSectionBefore(post.sections, section, null); | ||
| }); | ||
|
|
||
| // resurrect snapshotted range if it exists | ||
| let newRange = snapshot.getRange(post); | ||
| if (newRange) { | ||
| postEditor.setRange(newRange); | ||
| } | ||
| } | ||
| } |
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