64 lines
1.8 KiB
TypeScript
64 lines
1.8 KiB
TypeScript
/**
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* Copyright (c) 2018 The xterm.js authors. All rights reserved.
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* @license MIT
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*/
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import { IDisposable } from 'common/Types';
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/**
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* Debounces calls to render terminal rows using animation frames.
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*/
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export class RenderDebouncer implements IDisposable {
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private _rowStart: number | undefined;
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private _rowEnd: number | undefined;
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private _rowCount: number | undefined;
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private _animationFrame: number | undefined;
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constructor(
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private _renderCallback: (start: number, end: number) => void
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) {
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}
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public dispose(): void {
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if (this._animationFrame) {
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window.cancelAnimationFrame(this._animationFrame);
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this._animationFrame = undefined;
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}
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}
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public refresh(rowStart: number, rowEnd: number, rowCount: number): void {
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this._rowCount = rowCount;
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// Get the min/max row start/end for the arg values
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rowStart = rowStart !== undefined ? rowStart : 0;
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rowEnd = rowEnd !== undefined ? rowEnd : this._rowCount - 1;
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// Set the properties to the updated values
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this._rowStart = this._rowStart !== undefined ? Math.min(this._rowStart, rowStart) : rowStart;
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this._rowEnd = this._rowEnd !== undefined ? Math.max(this._rowEnd, rowEnd) : rowEnd;
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if (this._animationFrame) {
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return;
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}
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this._animationFrame = window.requestAnimationFrame(() => this._innerRefresh());
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}
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private _innerRefresh(): void {
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// Make sure values are set
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if (this._rowStart === undefined || this._rowEnd === undefined || this._rowCount === undefined) {
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return;
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}
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// Clamp values
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this._rowStart = Math.max(this._rowStart, 0);
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this._rowEnd = Math.min(this._rowEnd, this._rowCount - 1);
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// Run render callback
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this._renderCallback(this._rowStart, this._rowEnd);
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// Reset debouncer
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this._rowStart = undefined;
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this._rowEnd = undefined;
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this._animationFrame = undefined;
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}
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}
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