Issue MoonchildProductions/UXP#1578 - Add global menubar support for GTK

widget/gtk/nsMenuContainer.cpp

@@ -0,0 +1,156 @@
+/* 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/. */
+
+#include "mozilla/DebugOnly.h"
+#include "mozilla/Move.h"
+#include "nsGkAtoms.h"
+#include "nsIAtom.h"
+#include "nsIContent.h"
+
+#include "nsDbusmenu.h"
+#include "nsMenu.h"
+#include "nsMenuItem.h"
+#include "nsMenuSeparator.h"
+
+#include "nsMenuContainer.h"
+
+using namespace mozilla;
+
+const nsMenuContainer::ChildTArray::index_type nsMenuContainer::NoIndex = nsMenuContainer::ChildTArray::NoIndex;
+
+typedef UniquePtr<nsMenuObject> (*nsMenuObjectConstructor)(nsMenuContainer*,
+                                                           nsIContent*);
+
+template<class T>
+static UniquePtr<nsMenuObject> CreateMenuObject(nsMenuContainer* aContainer,
+                                                nsIContent* aContent) {
+    return UniquePtr<T>(new T(aContainer, aContent));
+}
+
+static nsMenuObjectConstructor
+GetMenuObjectConstructor(nsIContent* aContent) {
+    if (aContent->IsXULElement(nsGkAtoms::menuitem)) {
+        return CreateMenuObject<nsMenuItem>;
+    } else if (aContent->IsXULElement(nsGkAtoms::menu)) {
+        return CreateMenuObject<nsMenu>;
+    } else if (aContent->IsXULElement(nsGkAtoms::menuseparator)) {
+        return CreateMenuObject<nsMenuSeparator>;
+    }
+
+    return nullptr;
+}
+
+static bool
+ContentIsSupported(nsIContent* aContent) {
+    return GetMenuObjectConstructor(aContent) ? true : false;
+}
+
+nsMenuContainer::nsMenuContainer(nsMenuContainer* aParent,
+                                 nsIContent* aContent) :
+    nsMenuObject(aParent, aContent) {
+}
+
+nsMenuContainer::nsMenuContainer(nsNativeMenuDocListener* aListener,
+                                 nsIContent* aContent) :
+    nsMenuObject(aListener, aContent) {
+}
+
+UniquePtr<nsMenuObject>
+nsMenuContainer::CreateChild(nsIContent* aContent) {
+    nsMenuObjectConstructor ctor = GetMenuObjectConstructor(aContent);
+    if (!ctor) {
+        // There are plenty of node types we might stumble across that
+        // aren't supported
+        return nullptr;
+    }
+
+    UniquePtr<nsMenuObject> res = ctor(this, aContent);
+    return Move(res);
+}
+
+size_t
+nsMenuContainer::IndexOf(nsIContent* aChild) const {
+    if (!aChild) {
+        return NoIndex;
+    }
+
+    size_t count = ChildCount();
+    for (size_t i = 0; i < count; ++i) {
+        if (ChildAt(i)->ContentNode() == aChild) {
+            return i;
+        }
+    }
+
+    return NoIndex;
+}
+
+void
+nsMenuContainer::RemoveChildAt(size_t aIndex, bool aUpdateNative) {
+    MOZ_ASSERT(aIndex < ChildCount());
+
+    if (aUpdateNative) {
+        MOZ_ALWAYS_TRUE(
+            dbusmenu_menuitem_child_delete(GetNativeData(),
+                                           ChildAt(aIndex)->GetNativeData()));
+    }
+
+    mChildren.RemoveElementAt(aIndex);
+}
+
+void
+nsMenuContainer::RemoveChild(nsIContent* aChild, bool aUpdateNative) {
+    size_t index = IndexOf(aChild);
+    if (index == NoIndex) {
+        return;
+    }
+
+    RemoveChildAt(index, aUpdateNative);
+}
+
+void
+nsMenuContainer::InsertChildAfter(UniquePtr<nsMenuObject> aChild,
+                                  nsIContent* aPrevSibling,
+                                  bool aUpdateNative) {
+    size_t index = IndexOf(aPrevSibling);
+    MOZ_ASSERT(!aPrevSibling || index != NoIndex);
+
+    ++index;
+
+    if (aUpdateNative) {
+        aChild->CreateNativeData();
+        MOZ_ALWAYS_TRUE(
+            dbusmenu_menuitem_child_add_position(GetNativeData(),
+                                                 aChild->GetNativeData(),
+                                                 index));
+    }
+
+    MOZ_ALWAYS_TRUE(mChildren.InsertElementAt(index, Move(aChild)));
+}
+
+void
+nsMenuContainer::AppendChild(UniquePtr<nsMenuObject> aChild,
+                             bool aUpdateNative) {
+    if (aUpdateNative) {
+        aChild->CreateNativeData();
+        MOZ_ALWAYS_TRUE(
+            dbusmenu_menuitem_child_append(GetNativeData(),
+                                           aChild->GetNativeData()));
+    }
+
+    MOZ_ALWAYS_TRUE(mChildren.AppendElement(Move(aChild)));
+}
+
+bool
+nsMenuContainer::NeedsRebuild() const {
+    return false;
+}
+
+/* static */ nsIContent*
+nsMenuContainer::GetPreviousSupportedSibling(nsIContent* aContent) {
+    do {
+        aContent = aContent->GetPreviousSibling();
+    } while (aContent && !ContentIsSupported(aContent));
+
+    return aContent;
+}