xterm

[VSoRC/.git] / node_modules / xterm / src / browser / ScreenDprMonitor.ts

diff --git a/node_modules/xterm/src/browser/ScreenDprMonitor.ts b/node_modules/xterm/src/browser/ScreenDprMonitor.ts
new file mode 100644 (file)
index 0000000..ec8c6d8
--- /dev/null
+++ b/node_modules/xterm/src/browser/ScreenDprMonitor.ts
@@ -0,0 +1,69 @@
+/**
+ * Copyright (c) 2017 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import { Disposable } from 'common/Lifecycle';
+
+export type ScreenDprListener = (newDevicePixelRatio?: number, oldDevicePixelRatio?: number) => void;
+
+/**
+ * The screen device pixel ratio monitor allows listening for when the
+ * window.devicePixelRatio value changes. This is done not with polling but with
+ * the use of window.matchMedia to watch media queries. When the event fires,
+ * the listener will be reattached using a different media query to ensure that
+ * any further changes will register.
+ *
+ * The listener should fire on both window zoom changes and switching to a
+ * monitor with a different DPI.
+ */
+export class ScreenDprMonitor extends Disposable {
+  private _currentDevicePixelRatio: number = window.devicePixelRatio;
+  private _outerListener: ((this: MediaQueryList, ev: MediaQueryListEvent) => any) | undefined;
+  private _listener: ScreenDprListener | undefined;
+  private _resolutionMediaMatchList: MediaQueryList | undefined;
+
+  public setListener(listener: ScreenDprListener): void {
+    if (this._listener) {
+      this.clearListener();
+    }
+    this._listener = listener;
+    this._outerListener = () => {
+      if (!this._listener) {
+        return;
+      }
+      this._listener(window.devicePixelRatio, this._currentDevicePixelRatio);
+      this._updateDpr();
+    };
+    this._updateDpr();
+  }
+
+  public dispose(): void {
+    super.dispose();
+    this.clearListener();
+  }
+
+  private _updateDpr(): void {
+    if (!this._resolutionMediaMatchList || !this._outerListener) {
+      return;
+    }
+
+    // Clear listeners for old DPR
+    this._resolutionMediaMatchList.removeListener(this._outerListener);
+
+    // Add listeners for new DPR
+    this._currentDevicePixelRatio = window.devicePixelRatio;
+    this._resolutionMediaMatchList = window.matchMedia(`screen and (resolution: ${window.devicePixelRatio}dppx)`);
+    this._resolutionMediaMatchList.addListener(this._outerListener);
+  }
+
+  public clearListener(): void {
+    if (!this._resolutionMediaMatchList || !this._listener || !this._outerListener) {
+      return;
+    }
+    this._resolutionMediaMatchList.removeListener(this._outerListener);
+    this._resolutionMediaMatchList = undefined;
+    this._listener = undefined;
+    this._outerListener = undefined;
+  }
+}