Daniel Imms
b5cd4f1492
This is called for every selected cell when rendering which ends up consuming a bunch of CPU due to the DOM calls.
34 lines
967 B
TypeScript
34 lines
967 B
TypeScript
/**
|
|
* Copyright (c) 2019 The xterm.js authors. All rights reserved.
|
|
* @license MIT
|
|
*/
|
|
|
|
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 {
|
|
return this.window.devicePixelRatio;
|
|
}
|
|
|
|
public get isFocused(): boolean {
|
|
if (this._cachedIsFocused === undefined) {
|
|
this._cachedIsFocused = this._isFocused && this._textarea.ownerDocument.hasFocus();
|
|
queueMicrotask(() => this._cachedIsFocused = undefined);
|
|
}
|
|
return this._cachedIsFocused;
|
|
}
|
|
}
|