1 files changed, 84 insertions, 0 deletions
diff --git a/browser/components/downloads/DownloadsMacFinderProgress.sys.mjs b/browser/components/downloads/DownloadsMacFinderProgress.sys.mjs
new file mode 100644
index 0000000000..64e1dc4b8d
--- /dev/null
+++ b/browser/components/downloads/DownloadsMacFinderProgress.sys.mjs
@@ -0,0 +1,84 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80 filetype=javascript: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Handles the download progress indicator of the macOS Finder.
+ */
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  Downloads: "resource://gre/modules/Downloads.sys.mjs",
+});
+
+export var DownloadsMacFinderProgress = {
+  /**
+   * Maps the path of the download, to the according progress indicator instance.
+   */
+  _finderProgresses: null,
+
+  /**
+   * This method is called after a new browser window on macOS is opened, it
+   * registers for receiving download events for the progressbar of the Finder.
+   */
+  register() {
+    // Ensure to register only once per process and not for every window.
+    if (!this._finderProgresses) {
+      this._finderProgresses = new Map();
+      lazy.Downloads.getList(lazy.Downloads.ALL).then(list =>
+        list.addView(this)
+      );
+    }
+  },
+
+  onDownloadAdded(download) {
+    if (download.stopped) {
+      return;
+    }
+
+    let finderProgress = Cc[
+      "@mozilla.org/widget/macfinderprogress;1"
+    ].createInstance(Ci.nsIMacFinderProgress);
+
+    let path = download.target.path;
+
+    finderProgress.init(path, () => {
+      download.cancel().catch(console.error);
+      download.removePartialData().catch(console.error);
+    });
+
+    if (download.hasProgress) {
+      finderProgress.updateProgress(download.currentBytes, download.totalBytes);
+    } else {
+      finderProgress.updateProgress(0, 0);
+    }
+    this._finderProgresses.set(path, finderProgress);
+  },
+
+  onDownloadChanged(download) {
+    let path = download.target.path;
+    let finderProgress = this._finderProgresses.get(path);
+    if (!finderProgress) {
+      // The download is not tracked, it may have been restarted,
+      // thus forward the call to onDownloadAdded to check if it should be tracked.
+      this.onDownloadAdded(download);
+    } else if (download.stopped) {
+      finderProgress.end();
+      this._finderProgresses.delete(path);
+    } else {
+      finderProgress.updateProgress(download.currentBytes, download.totalBytes);
+    }
+  },
+
+  onDownloadRemoved(download) {
+    let path = download.target.path;
+    let finderProgress = this._finderProgresses.get(path);
+    if (finderProgress) {
+      finderProgress.end();
+      this._finderProgresses.delete(path);
+    }
+  },
+};