From b52feccdcc58c1f4583c8542632d6c026335dea7 Mon Sep 17 00:00:00 2001
From: Anthony Schneider <tonyschneider3@gmail.com>
Date: Fri, 11 Feb 2022 19:40:35 -0600
Subject: Changed javascript to be in its own file. Began (messy) setup for
 terminal.

---
 node_modules/xterm/src/browser/RenderDebouncer.ts | 63 +++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 node_modules/xterm/src/browser/RenderDebouncer.ts

(limited to 'node_modules/xterm/src/browser/RenderDebouncer.ts')

diff --git a/node_modules/xterm/src/browser/RenderDebouncer.ts b/node_modules/xterm/src/browser/RenderDebouncer.ts
new file mode 100644
index 0000000..0252107
--- /dev/null
+++ b/node_modules/xterm/src/browser/RenderDebouncer.ts
@@ -0,0 +1,63 @@
+/**
+ * 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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