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