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+/* 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_a11y_FocusManager_h_
+#define mozilla_a11y_FocusManager_h_
+
+#include "mozilla/RefPtr.h"
+
+class nsINode;
+class nsISupports;
+
+namespace mozilla {
+namespace dom {
+class Document;
+}
+
+namespace a11y {
+
+class Accessible;
+class AccEvent;
+class LocalAccessible;
+class DocAccessible;
+class DocAccessibleParent;
+
+/**
+ * Manage the accessible focus. Used to fire and process accessible events.
+ */
+class FocusManager {
+ public:
+ virtual ~FocusManager();
+
+ /**
+ * Return the currently focused LocalAccessible. If a remote document has
+ * focus, this will return null.
+ */
+ LocalAccessible* FocusedLocalAccessible() const;
+
+ /**
+ * Return the currently focused Accessible, local or remote.
+ */
+ Accessible* FocusedAccessible() const;
+
+ /**
+ * Return true if given accessible is focused.
+ */
+ bool IsFocused(const Accessible* aAccessible) const {
+ return FocusedAccessible() == aAccessible;
+ }
+
+ /**
+ * Return true if the given accessible is an active item, i.e. an item that
+ * is current within the active widget.
+ */
+ inline bool IsActiveItem(const LocalAccessible* aAccessible) {
+ return aAccessible == mActiveItem;
+ }
+
+ /**
+ * Return DOM node having DOM focus.
+ */
+ nsINode* FocusedDOMNode() const;
+
+ /**
+ * Return true if given DOM node has DOM focus.
+ */
+ inline bool HasDOMFocus(const nsINode* aNode) const {
+ return aNode == FocusedDOMNode();
+ }
+
+ /**
+ * Return true if focused accessible is within the given container.
+ */
+ bool IsFocusWithin(const Accessible* aContainer) const;
+
+ /**
+ * Return whether the given accessible is focused or contains the focus or
+ * contained by focused accessible.
+ */
+ enum FocusDisposition { eNone, eFocused, eContainsFocus, eContainedByFocus };
+ FocusDisposition IsInOrContainsFocus(
+ const LocalAccessible* aAccessible) const;
+
+ /**
+ * Return true if the given accessible was the last accessible focused.
+ * This is useful to detect the case where the last focused accessible was
+ * removed before something else was focused. This can happen in one of two
+ * ways:
+ * 1. The DOM focus was removed. DOM doesn't fire a blur event when this
+ * happens; see bug 559561.
+ * 2. The accessibility focus was an active item (e.g. aria-activedescendant)
+ * and that item was removed.
+ */
+ bool WasLastFocused(const LocalAccessible* aAccessible) const;
+
+ //////////////////////////////////////////////////////////////////////////////
+ // Focus notifications and processing (don't use until you know what you do).
+
+ /**
+ * Called when DOM focus event is fired.
+ */
+ void NotifyOfDOMFocus(nsISupports* aTarget);
+
+ /**
+ * Called when DOM blur event is fired.
+ */
+ void NotifyOfDOMBlur(nsISupports* aTarget);
+
+ /**
+ * Called when active item is changed. Note: must be called when accessible
+ * tree is up to date.
+ */
+ void ActiveItemChanged(LocalAccessible* aItem, bool aCheckIfActive = true);
+
+ /**
+ * Dispatch delayed focus event for the current focus accessible.
+ */
+ void ForceFocusEvent();
+
+ /**
+ * Dispatch delayed focus event for the given target.
+ */
+ void DispatchFocusEvent(DocAccessible* aDocument, LocalAccessible* aTarget);
+
+ /**
+ * Process DOM focus notification.
+ */
+ void ProcessDOMFocus(nsINode* aTarget);
+
+ /**
+ * Process the delayed accessible event.
+ * do.
+ */
+ void ProcessFocusEvent(AccEvent* aEvent);
+
+#ifdef ANDROID
+ void SetFocusedRemoteDoc(DocAccessibleParent* aDoc) {
+ mFocusedRemoteDoc = aDoc;
+ }
+ bool IsFocusedRemoteDoc(DocAccessibleParent* aDoc) {
+ return mFocusedRemoteDoc == aDoc;
+ }
+#endif
+
+ protected:
+ FocusManager();
+
+ private:
+ FocusManager(const FocusManager&);
+ FocusManager& operator=(const FocusManager&);
+
+ /**
+ * Return DOM document having DOM focus.
+ */
+ dom::Document* FocusedDOMDocument() const;
+
+ private:
+ RefPtr<LocalAccessible> mActiveItem;
+ RefPtr<LocalAccessible> mLastFocus;
+ RefPtr<LocalAccessible> mActiveARIAMenubar;
+#ifdef ANDROID
+ DocAccessibleParent* mFocusedRemoteDoc = nullptr;
+#endif
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif