From 4492b5f8e774bf3b4f21e4e468fc052cbcbb468a Mon Sep 17 00:00:00 2001
From: Thomas Groman <tgroman@nuegia.net>
Date: Mon, 16 Dec 2019 19:48:42 -0800
Subject: initial commit

---
 modules/RecentWindow.jsm | 68 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 modules/RecentWindow.jsm

(limited to 'modules/RecentWindow.jsm')

diff --git a/modules/RecentWindow.jsm b/modules/RecentWindow.jsm
new file mode 100644
index 0000000..0018b50
--- /dev/null
+++ b/modules/RecentWindow.jsm
@@ -0,0 +1,68 @@
+/* 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/. */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = ["RecentWindow"];
+
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/PrivateBrowsingUtils.jsm");
+
+#ifndef XP_WIN
+#define BROKEN_WM_Z_ORDER
+#endif
+
+this.RecentWindow = {
+  /*
+   * Get the most recent browser window.
+   *
+   * @param aOptions an object accepting the arguments for the search.
+   *        * private: true to restrict the search to private windows
+   *            only, false to restrict the search to non-private only.
+   *            Omit the property to search in both groups.
+   *        * allowPopups: true if popup windows are permissable.
+   */
+  getMostRecentBrowserWindow: function RW_getMostRecentBrowserWindow(aOptions) {
+    let checkPrivacy = typeof aOptions == "object" &&
+                       "private" in aOptions;
+
+    let allowPopups = typeof aOptions == "object" && !!aOptions.allowPopups;
+
+    function isSuitableBrowserWindow(win) {
+      return (!win.closed &&
+              (allowPopups || win.toolbar.visible) &&
+              (!checkPrivacy ||
+               PrivateBrowsingUtils.permanentPrivateBrowsing ||
+               PrivateBrowsingUtils.isWindowPrivate(win) == aOptions.private));
+    }
+
+#ifdef BROKEN_WM_Z_ORDER
+    let win = Services.wm.getMostRecentWindow("navigator:browser");
+
+    // if we're lucky, this isn't a popup, and we can just return this
+    if (win && !isSuitableBrowserWindow(win)) {
+      win = null;
+      let windowList = Services.wm.getEnumerator("navigator:browser");
+      // this is oldest to newest, so this gets a bit ugly
+      while (windowList.hasMoreElements()) {
+        let nextWin = windowList.getNext();
+        if (isSuitableBrowserWindow(nextWin))
+          win = nextWin;
+      }
+    }
+    return win;
+#else
+    let windowList = Services.wm.getZOrderDOMWindowEnumerator("navigator:browser", true);
+    while (windowList.hasMoreElements()) {
+      let win = windowList.getNext();
+      if (isSuitableBrowserWindow(win))
+        return win;
+    }
+    return null;
+#endif
+  }
+};
+
-- 
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