1 files changed, 98 insertions, 0 deletions
diff --git a/docshell/base/BrowsingContextWebProgress.h b/docshell/base/BrowsingContextWebProgress.h
new file mode 100644
index 0000000000..b39fb2545d
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+++ b/docshell/base/BrowsingContextWebProgress.h
@@ -0,0 +1,98 @@
+/* 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/. */
+
+#ifndef mozilla_dom_BrowsingContextWebProgress_h
+#define mozilla_dom_BrowsingContextWebProgress_h
+
+#include "nsIWebProgress.h"
+#include "nsIWebProgressListener.h"
+#include "nsTObserverArray.h"
+#include "nsWeakReference.h"
+#include "nsCycleCollectionParticipant.h"
+
+namespace mozilla::dom {
+
+class CanonicalBrowsingContext;
+
+/// Object acting as the nsIWebProgress instance for a BrowsingContext over its
+/// lifetime.
+///
+/// An active toplevel CanonicalBrowsingContext will always have a
+/// BrowsingContextWebProgress, which will be moved between contexts as
+/// BrowsingContextGroup-changing loads are performed.
+///
+/// Subframes will only have a `BrowsingContextWebProgress` if they are loaded
+/// in a content process, and will use the nsDocShell instead if they are loaded
+/// in the parent process, as parent process documents cannot have or be
+/// out-of-process iframes.
+class BrowsingContextWebProgress final : public nsIWebProgress,
+                                         public nsIWebProgressListener {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(BrowsingContextWebProgress,
+                                           nsIWebProgress)
+  NS_DECL_NSIWEBPROGRESS
+  NS_DECL_NSIWEBPROGRESSLISTENER
+
+  explicit BrowsingContextWebProgress(
+      CanonicalBrowsingContext* aBrowsingContext);
+
+  struct ListenerInfo {
+    ListenerInfo(nsIWeakReference* aListener, unsigned long aNotifyMask)
+        : mWeakListener(aListener), mNotifyMask(aNotifyMask) {}
+
+    bool operator==(const ListenerInfo& aOther) const {
+      return mWeakListener == aOther.mWeakListener;
+    }
+    bool operator==(const nsWeakPtr& aOther) const {
+      return mWeakListener == aOther;
+    }
+
+    // Weak pointer for the nsIWebProgressListener...
+    nsWeakPtr mWeakListener;
+
+    // Mask indicating which notifications the listener wants to receive.
+    unsigned long mNotifyMask;
+  };
+
+  void ContextDiscarded();
+  void ContextReplaced(CanonicalBrowsingContext* aNewContext);
+
+  void SetLoadType(uint32_t aLoadType) { mLoadType = aLoadType; }
+
+ private:
+  virtual ~BrowsingContextWebProgress();
+
+  void UpdateAndNotifyListeners(
+      uint32_t aFlag,
+      const std::function<void(nsIWebProgressListener*)>& aCallback);
+
+  using ListenerArray = nsAutoTObserverArray<ListenerInfo, 4>;
+  ListenerArray mListenerInfoList;
+
+  // The current BrowsingContext which owns this BrowsingContextWebProgress.
+  // This context may change during navigations and may not be fully attached at
+  // all times.
+  RefPtr<CanonicalBrowsingContext> mCurrentBrowsingContext;
+
+  // The current request being actively loaded by the BrowsingContext. Only set
+  // while mIsLoadingDocument is true, and is used to fire STATE_STOP
+  // notifications if the BrowsingContext is discarded while the load is
+  // ongoing.
+  nsCOMPtr<nsIRequest> mLoadingDocumentRequest;
+
+  // The most recent load type observed for this BrowsingContextWebProgress.
+  uint32_t mLoadType = 0;
+
+  // Are we currently in the process of loading a document? This is true between
+  // the `STATE_START` notification from content and the `STATE_STOP`
+  // notification being received. Duplicate `STATE_START` events may be
+  // discarded while loading a document to avoid noise caused by process
+  // switches.
+  bool mIsLoadingDocument = false;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_BrowsingContextWebProgress_h