dom/xul/XULMenuBarElement.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "XULMenuBarElement.h"
   8 #include "MenuBarListener.h"
   9 #include "XULButtonElement.h"
  10 #include "nsXULPopupManager.h"
  11 #include "mozilla/Assertions.h"
  12 #include "mozilla/dom/BindContext.h"
  13 #include "mozilla/AsyncEventDispatcher.h"
  14 #include "mozilla/Try.h"
  15
  16 namespace mozilla::dom {
  17
  18 NS_IMPL_CYCLE_COLLECTION_CLASS(XULMenuBarElement)
  19 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(XULMenuBarElement,
  20                                                 XULMenuParentElement)
  21   if (tmp->mListener) {
  22     tmp->mListener->Detach();
  23     tmp->mListener = nullptr;
  24   }
  25 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
  26 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(XULMenuBarElement,
  27                                                   XULMenuParentElement)
  28   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mListener)
  29 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
  30 NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(XULMenuBarElement,
  31                                                XULMenuParentElement)
  32
  33 XULMenuBarElement::XULMenuBarElement(
  34     already_AddRefed<class NodeInfo>&& aNodeInfo)
  35     : XULMenuParentElement(std::move(aNodeInfo)) {}
  36
  37 XULMenuBarElement::~XULMenuBarElement() { MOZ_DIAGNOSTIC_ASSERT(!mListener); }
  38
  39 void XULMenuBarElement::SetActive(bool aActiveFlag) {
  40   // If the activity is not changed, there is nothing to do.
  41   if (mIsActive == aActiveFlag) {
  42     return;
  43   }
  44
  45   // We can't activate a menubar outside of the document.
  46   if (!IsInComposedDoc()) {
  47     MOZ_ASSERT(!mIsActive, "How?");
  48     return;
  49   }
  50
  51   if (!aActiveFlag) {
  52     // If there is a request to deactivate the menu bar, check to see whether
  53     // there is a menu popup open for the menu bar. In this case, don't
  54     // deactivate the menu bar.
  55     if (auto* activeChild = GetActiveMenuChild()) {
  56       if (activeChild->IsMenuPopupOpen()) {
  57         return;
  58       }
  59     }
  60   }
  61
  62   mIsActive = aActiveFlag;
  63   if (nsXULPopupManager* pm = nsXULPopupManager::GetInstance()) {
  64     pm->SetActiveMenuBar(this, aActiveFlag);
  65   }
  66   if (!aActiveFlag) {
  67     mActiveByKeyboard = false;
  68     SetActiveMenuChild(nullptr);
  69   }
  70
  71   RefPtr dispatcher = new AsyncEventDispatcher(
  72       this, aActiveFlag ? u"DOMMenuBarActive"_ns : u"DOMMenuBarInactive"_ns,
  73       CanBubble::eYes, ChromeOnlyDispatch::eNo);
  74   DebugOnly<nsresult> rv = dispatcher->PostDOMEvent();
  75   NS_ASSERTION(NS_SUCCEEDED(rv), "AsyncEventDispatcher failed to dispatch");
  76 }
  77
  78 nsresult XULMenuBarElement::BindToTree(BindContext& aContext,
  79                                        nsINode& aParent) {
  80   MOZ_TRY(XULMenuParentElement::BindToTree(aContext, aParent));
  81   MOZ_DIAGNOSTIC_ASSERT(!mListener);
  82   if (aContext.InComposedDoc()) {
  83     mListener = new MenuBarListener(*this);
  84   }
  85   return NS_OK;
  86 }
  87
  88 void XULMenuBarElement::UnbindFromTree(UnbindContext& aContext) {
  89   if (mListener) {
  90     mListener->Detach();
  91     mListener = nullptr;
  92   }
  93   if (NS_WARN_IF(mIsActive)) {
  94     // Clean up silently when getting removed from the document while active.
  95     mIsActive = false;
  96     if (nsXULPopupManager* pm = nsXULPopupManager::GetInstance()) {
  97       pm->SetActiveMenuBar(this, false);
  98     }
  99   }
 100   return XULMenuParentElement::UnbindFromTree(aContext);
 101 }
 102
 103 }  // namespace mozilla::dom