Pull common parts into BaseRenderLayer

2017-08-31 17:13:15 -07:00
parent fd18f7cba7
commit a91380a76f
7 changed files with 47 additions and 64 deletions
@@ -0,0 +1,23 @@
+import { IRenderLayer } from './Interfaces';
+import { ITerminal } from '../Interfaces';
+
+export abstract class BaseRenderLayer implements IRenderLayer {
+  protected _canvas: HTMLCanvasElement;
+  protected _ctx: CanvasRenderingContext2D;
+
+  constructor(container: HTMLElement, id: string, zIndex: number) {
+    this._canvas = document.createElement('canvas');
+    this._canvas.id = `xterm-${id}-layer`;
+    this._canvas.style.zIndex = zIndex.toString();
+    this._ctx = this._canvas.getContext('2d');
+    this._ctx.scale(window.devicePixelRatio, window.devicePixelRatio);
+    container.appendChild(this._canvas);
+  }
+
+  public resize(terminal: ITerminal, canvasWidth: number, canvasHeight: number, charSizeChanged: boolean): void {
+    this._canvas.width = canvasWidth * window.devicePixelRatio;
+    this._canvas.height = canvasHeight * window.devicePixelRatio;
+    this._canvas.style.width = `${canvasWidth}px`;
+    this._canvas.style.height = `${canvasHeight}px`;
+  }
+}