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Cache ICoreBrowserService.isFocused per task

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This is called for every selected cell when rendering which ends up
consuming a bunch of CPU due to the DOM calls.
This commit is contained in:
Daniel Imms
2022-10-27 16:50:45 -07:00
parent a4f8b07a7f
commit b5cd4f1492
1 changed files with 10 additions and 2 deletions
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src/browser/services/CoreBrowserService.ts
+10 -2
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@@ -8,10 +8,15 @@ import { ICoreBrowserService } from './Services';
export class CoreBrowserService implements ICoreBrowserService {
public serviceBrand: undefined;
private _isFocused = false;
private _cachedIsFocused: boolean | undefined = undefined;
constructor(
private _textarea: HTMLTextAreaElement,
public readonly window: Window & typeof globalThis
) {
this._textarea.addEventListener('focus', () => this._isFocused = true);
this._textarea.addEventListener('blur', () => this._isFocused = false);
}
public get dpr(): number {
@@ -19,7 +24,10 @@ export class CoreBrowserService implements ICoreBrowserService {
}
public get isFocused(): boolean {
const docOrShadowRoot = this._textarea.getRootNode ? this._textarea.getRootNode() as Document | ShadowRoot : this._textarea.ownerDocument;
return docOrShadowRoot.activeElement === this._textarea && this._textarea.ownerDocument.hasFocus();
if (this._cachedIsFocused === undefined) {
this._cachedIsFocused = this._isFocused && this._textarea.ownerDocument.hasFocus();
queueMicrotask(() => this._cachedIsFocused = undefined);
}
return this._cachedIsFocused;
}
}