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Improve performance of body <> bodyEditorValue by making both mutations lazy

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This commit is contained in:
Ben Gotow 2019-06-16 16:47:40 -05:00
parent 60c613fe7d
commit cfef571559
1 changed files with 49 additions and 24 deletions
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73
app/src/flux/stores/draft-editing-session.ts
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@ -26,61 +26,86 @@ let DraftStore = null;
function hotwireDraftBodyState(draft: any, session: DraftEditingSession): MessageWithEditorState {
// Populate the bodyEditorState and override the draft properties
// so that they're kept in sync with minimal recomputation
let _bodyHTMLCache = draft.body;
let _bodyEditorState = null;
// so that they're kept in sync with minimal recomputation.
let _bodyHTMLValue = draft.body;
let _bodyEditorValue = null;
draft.__bodyPropDescriptor = {
configurable: true,
get: function() {
if (!_bodyHTMLCache) {
console.log('building HTML body cache');
_bodyHTMLCache = convertToHTML(_bodyEditorState);
if (!_bodyHTMLValue) {
_bodyHTMLValue = convertToHTML(_bodyEditorValue);
}
return _bodyHTMLCache;
return _bodyHTMLValue;
},
set: function(inHTML) {
let nextValue = convertFromHTML(inHTML);
if (_bodyHTMLValue === inHTML) return;
_bodyHTMLValue = inHTML;
if (session._mountedEditor) {
nextValue = session._mountedEditor
// compute it now and apply it, preserving the document history
_bodyEditorValue = session._mountedEditor
.moveToRangeOfDocument()
.delete()
.insertFragment(convertFromHTML(inHTML).document)
.moveToRangeOfDocument()
.moveToStart()
.deleteForward(1).value;
.moveToStart().value;
// occasionally inserting the new document adds a new line at the beginning of the value.
// It's unclaer why this happens...
const firstBlock = _bodyEditorValue.document.getBlocks().first();
if (firstBlock.text === '') {
_bodyEditorValue = session._mountedEditor.removeNodeByKey(firstBlock.key).value;
}
} else {
// compute it again when it's asked for
_bodyEditorValue = null;
}
_bodyEditorState = nextValue;
},
};
draft.__bodyEditorStatePropDescriptor = {
draft.__bodyEditorValuePropDescriptor = {
configurable: true,
get: function() {
return _bodyEditorState;
},
set: function(next) {
if (_bodyEditorState !== next) {
_bodyHTMLCache = null;
if (!_bodyEditorValue) {
_bodyEditorValue = convertFromHTML(_bodyHTMLValue);
}
_bodyEditorState = next;
return _bodyEditorValue;
},
set: function(inValue) {
if (_bodyEditorValue === inValue) return;
_bodyHTMLValue = null;
_bodyEditorValue = inValue;
},
};
Object.defineProperty(draft, 'body', draft.__bodyPropDescriptor);
Object.defineProperty(draft, 'bodyEditorState', draft.__bodyEditorStatePropDescriptor);
draft.body = _bodyHTMLCache;
Object.defineProperty(draft, 'bodyEditorState', draft.__bodyEditorValuePropDescriptor);
draft.body = _bodyHTMLValue;
return draft as MessageWithEditorState;
}
function fastCloneDraft(draft) {
/**
* Note: This method is intended to return a new Mesasge object so that lazy people doing
* shallow equals get the correct basic behavior as the draft is modified in the session.
*
* However, this method does not deep clone array values (To:, etc.) and the hot-wired body
* and bodyEditorValue are linked through the same internal state. Changing the body of
* the cloned draft changes the body of the old draft too.
*
* At the moment these tradeoffs seem OK because we're really just trying to make
* "props.draft !== nextProps.draft" work.
*/
function fastCloneDraft(draft: MessageWithEditorState) {
const next = new Message({});
for (const key of Object.getOwnPropertyNames(draft)) {
if (key === 'body' || key === 'bodyEditorState') continue;
next[key] = draft[key];
}
Object.defineProperty(next, 'body', (next as any).__bodyPropDescriptor);
Object.defineProperty(next, 'bodyEditorState', (next as any).__bodyEditorStatePropDescriptor);
Object.defineProperty(next, 'bodyEditorState', (next as any).__bodyEditorValuePropDescriptor);
return next as MessageWithEditorState;
}
@ -342,7 +367,6 @@ export class DraftEditingSession extends MailspringStore {
// be made through the editing session and we don't want to overwrite the user's
// work under any scenario.
const lockedFields = this.changes.dirtyFields();
let changed = false;
for (const [key] of Object.entries(Message.attributes)) {
if (key === 'headerMessageId') continue;
@ -356,6 +380,7 @@ export class DraftEditingSession extends MailspringStore {
}
this._draft[key] = nextDraft[key];
}
if (changed) {
this.trigger();
}