From d18faf81938c947f1d02feab2c394b8135f88d8f Mon Sep 17 00:00:00 2001
From: Lootyhoof <lootyhoofer@gmail.com>
Date: Sat, 6 Jun 2020 00:37:29 +0100
Subject: Issue MoonchildProductions/UXP#1578 - Add global menubar support for
 GTK

---
 widget/gtk/nsMenu.h | 120 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 widget/gtk/nsMenu.h

(limited to 'widget/gtk/nsMenu.h')

diff --git a/widget/gtk/nsMenu.h b/widget/gtk/nsMenu.h
new file mode 100644
index 000000000..a198a8e72
--- /dev/null
+++ b/widget/gtk/nsMenu.h
@@ -0,0 +1,120 @@
+/* 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 __nsMenu_h__
+#define __nsMenu_h__
+
+#include "mozilla/Attributes.h"
+#include "mozilla/UniquePtr.h"
+#include "nsCOMPtr.h"
+
+#include "nsDbusmenu.h"
+#include "nsMenuContainer.h"
+#include "nsMenuObject.h"
+
+#include <glib.h>
+
+class nsIAtom;
+class nsIContent;
+class nsITimer;
+class nsStyleContext;
+
+#define NSMENU_NUMBER_OF_POPUPSTATE_BITS 2U
+#define NSMENU_NUMBER_OF_FLAGS           4U
+
+// This class represents a menu
+class nsMenu final : public nsMenuContainer {
+public:
+    nsMenu(nsMenuContainer* aParent, nsIContent* aContent);
+    ~nsMenu();
+
+    nsMenuObject::EType Type() const override;
+
+    bool IsBeingDisplayed() const override;
+    bool NeedsRebuild() const override;
+
+    // Tell the desktop shell to display this menu
+    void OpenMenu();
+
+    // Normally called via the shell, but it's public so that child
+    // menuitems can do the shells work. Sigh....
+    void OnClose();
+
+private:
+    friend class nsMenuContentInsertedEvent;
+    friend class nsMenuContentRemovedEvent;
+
+    enum EPopupState {
+        ePopupState_Closed,
+        ePopupState_Showing,
+        ePopupState_Open,
+        ePopupState_Hiding
+    };
+
+    void SetPopupState(EPopupState aState);
+
+    static void DoOpenCallback(nsITimer* aTimer, void* aClosure);
+    static void menu_event_cb(DbusmenuMenuitem* menu,
+                              const gchar* name,
+                              GVariant* value,
+                              guint timestamp,
+                              gpointer user_data);
+
+    // We add a placeholder item to empty menus so that Unity actually treats
+    // us as a proper menu, rather than a menuitem without a submenu
+    void MaybeAddPlaceholderItem();
+
+    // Removes a placeholder item if it exists and asserts that this succeeds
+    void EnsureNoPlaceholderItem();
+
+    void OnOpen();
+    void Build();
+    void InitializePopup();
+    void RemoveChildAt(size_t aIndex);
+    void RemoveChild(nsIContent* aChild);
+    void InsertChildAfter(mozilla::UniquePtr<nsMenuObject> aChild,
+                          nsIContent* aPrevSibling);
+    void AppendChild(mozilla::UniquePtr<nsMenuObject> aChild);
+    bool IsInBatchedUpdate() const;
+    void StructureMutated();
+    bool CanOpen() const;
+
+    void HandleContentInserted(nsIContent* aContainer,
+                               nsIContent* aChild,
+                               nsIContent* aPrevSibling);
+    void HandleContentRemoved(nsIContent* aContainer,
+                              nsIContent* aChild);
+
+    void InitializeNativeData() override;
+    void Update(nsStyleContext* aStyleContext) override;
+    nsMenuObject::PropertyFlags SupportedProperties() const override;
+
+    void OnAttributeChanged(nsIContent* aContent, nsIAtom* aAttribute) override;
+    void OnContentInserted(nsIContent* aContainer, nsIContent* aChild,
+                           nsIContent* aPrevSibling) override;
+    void OnContentRemoved(nsIContent* aContainer, nsIContent* aChild) override;
+    void OnBeginUpdates(nsIContent* aContent) override;
+    void OnEndUpdates() override;
+
+    bool mNeedsRebuild;
+    bool mNeedsUpdate;
+
+    DbusmenuMenuitem* mPlaceholderItem;
+
+    EPopupState mPopupState;
+
+    enum EBatchedUpdateState {
+        eBatchedUpdateState_Inactive,
+        eBatchedUpdateState_Active,
+        eBatchedUpdateState_DidMutate
+    };
+
+    EBatchedUpdateState mBatchedUpdateState;
+
+    nsCOMPtr<nsIContent> mPopupContent;
+
+    nsCOMPtr<nsITimer> mOpenDelayTimer;
+};
+
+#endif /* __nsMenu_h__ */
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