Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 435 insertions, 0 deletions

diff --git a/dom/xul/nsXULCommandDispatcher.cpp b/dom/xul/nsXULCommandDispatcher.cpp
new file mode 100644
index 0000000000..0b07086914
--- /dev/null
+++ b/dom/xul/nsXULCommandDispatcher.cpp
@@ -0,0 +1,435 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 sw=2 et tw=80: */
+/* 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/. */
+
+/*
+
+  This file provides the implementation for the XUL Command Dispatcher.
+
+ */
+
+#include "nsIContent.h"
+#include "nsFocusManager.h"
+#include "nsIControllers.h"
+#include "mozilla/dom/Document.h"
+#include "nsPresContext.h"
+#include "nsIScriptGlobalObject.h"
+#include "nsPIDOMWindow.h"
+#include "nsPIWindowRoot.h"
+#include "nsXULCommandDispatcher.h"
+#include "mozilla/Logging.h"
+#include "nsContentUtils.h"
+#include "nsReadableUtils.h"
+#include "nsCRT.h"
+#include "nsError.h"
+#include "mozilla/BasicEvents.h"
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/ElementBinding.h"
+
+using namespace mozilla;
+using mozilla::dom::Document;
+using mozilla::dom::Element;
+
+#ifdef DEBUG
+static LazyLogModule gCommandLog("nsXULCommandDispatcher");
+#endif
+
+////////////////////////////////////////////////////////////////////////
+
+nsXULCommandDispatcher::nsXULCommandDispatcher(Document* aDocument)
+    : mDocument(aDocument), mUpdaters(nullptr), mLocked(false) {}
+
+nsXULCommandDispatcher::~nsXULCommandDispatcher() { Disconnect(); }
+
+// QueryInterface implementation for nsXULCommandDispatcher
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsXULCommandDispatcher)
+  NS_INTERFACE_MAP_ENTRY(nsIDOMXULCommandDispatcher)
+  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMXULCommandDispatcher)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsXULCommandDispatcher)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(nsXULCommandDispatcher)
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsXULCommandDispatcher)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsXULCommandDispatcher)
+  tmp->Disconnect();
+  NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsXULCommandDispatcher)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
+  Updater* updater = tmp->mUpdaters;
+  while (updater) {
+    cb.NoteXPCOMChild(updater->mElement);
+    updater = updater->mNext;
+  }
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+void nsXULCommandDispatcher::Disconnect() {
+  while (mUpdaters) {
+    Updater* doomed = mUpdaters;
+    mUpdaters = mUpdaters->mNext;
+    delete doomed;
+  }
+  mDocument = nullptr;
+}
+
+already_AddRefed<nsPIWindowRoot> nsXULCommandDispatcher::GetWindowRoot() {
+  if (mDocument) {
+    if (nsCOMPtr<nsPIDOMWindowOuter> window = mDocument->GetWindow()) {
+      return window->GetTopWindowRoot();
+    }
+  }
+
+  return nullptr;
+}
+
+Element* nsXULCommandDispatcher::GetRootFocusedContentAndWindow(
+    nsPIDOMWindowOuter** aWindow) {
+  *aWindow = nullptr;
+
+  if (!mDocument) {
+    return nullptr;
+  }
+
+  if (nsCOMPtr<nsPIDOMWindowOuter> win = mDocument->GetWindow()) {
+    if (nsCOMPtr<nsPIDOMWindowOuter> rootWindow = win->GetPrivateRoot()) {
+      return nsFocusManager::GetFocusedDescendant(
+          rootWindow, nsFocusManager::eIncludeAllDescendants, aWindow);
+    }
+  }
+
+  return nullptr;
+}
+
+NS_IMETHODIMP
+nsXULCommandDispatcher::GetFocusedElement(Element** aElement) {
+  *aElement = nullptr;
+
+  nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
+  RefPtr<Element> focusedContent =
+      GetRootFocusedContentAndWindow(getter_AddRefs(focusedWindow));
+  if (focusedContent) {
+    // Make sure the caller can access the focused element.
+    if (!nsContentUtils::SubjectPrincipalOrSystemIfNativeCaller()->Subsumes(
+            focusedContent->NodePrincipal())) {
+      // XXX This might want to return null, but we use that return value
+      // to mean "there is no focused element," so to be clear, throw an
+      // exception.
+      return NS_ERROR_DOM_SECURITY_ERR;
+    }
+  }
+
+  focusedContent.forget(aElement);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXULCommandDispatcher::GetFocusedWindow(mozIDOMWindowProxy** aWindow) {
+  *aWindow = nullptr;
+
+  nsCOMPtr<nsPIDOMWindowOuter> window;
+  GetRootFocusedContentAndWindow(getter_AddRefs(window));
+  if (!window) return NS_OK;
+
+  // Make sure the caller can access this window. The caller can access this
+  // window iff it can access the document.
+  nsCOMPtr<Document> doc = window->GetDoc();
+
+  // Note: If there is no document, then this window has been cleared and
+  // there's nothing left to protect, so let the window pass through.
+  if (doc && !nsContentUtils::CanCallerAccess(doc))
+    return NS_ERROR_DOM_SECURITY_ERR;
+
+  window.forget(aWindow);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXULCommandDispatcher::SetFocusedElement(Element* aElement) {
+  RefPtr<nsFocusManager> fm = nsFocusManager::GetFocusManager();
+  NS_ENSURE_TRUE(fm, NS_ERROR_FAILURE);
+
+  if (aElement) {
+    return fm->SetFocus(aElement, 0);
+  }
+
+  // if aElement is null, clear the focus in the currently focused child window
+  nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
+  GetRootFocusedContentAndWindow(getter_AddRefs(focusedWindow));
+  return fm->ClearFocus(focusedWindow);
+}
+
+NS_IMETHODIMP
+nsXULCommandDispatcher::SetFocusedWindow(mozIDOMWindowProxy* aWindow) {
+  NS_ENSURE_TRUE(aWindow, NS_OK);  // do nothing if set to null
+
+  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(aWindow);
+  NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
+
+  RefPtr<nsFocusManager> fm = nsFocusManager::GetFocusManager();
+  NS_ENSURE_TRUE(fm, NS_ERROR_FAILURE);
+
+  // get the containing frame for the window, and set it as focused. This will
+  // end up focusing whatever is currently focused inside the frame. Since
+  // setting the command dispatcher's focused window doesn't raise the window,
+  // setting it to a top-level window doesn't need to do anything.
+  RefPtr<Element> frameElement = window->GetFrameElementInternal();
+  if (frameElement) {
+    return fm->SetFocus(frameElement, 0);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXULCommandDispatcher::AdvanceFocus() {
+  return AdvanceFocusIntoSubtree(nullptr);
+}
+
+NS_IMETHODIMP
+nsXULCommandDispatcher::AdvanceFocusIntoSubtree(Element* aElt) {
+  return MoveFocusIntoSubtree(aElt, /* aForward = */ true);
+}
+
+NS_IMETHODIMP
+nsXULCommandDispatcher::RewindFocus() {
+  return MoveFocusIntoSubtree(nullptr, /* aForward = */ false);
+}
+
+nsresult nsXULCommandDispatcher::MoveFocusIntoSubtree(Element* aElt,
+                                                      bool aForward) {
+  nsCOMPtr<nsPIDOMWindowOuter> win;
+  GetRootFocusedContentAndWindow(getter_AddRefs(win));
+
+  RefPtr<Element> result;
+  nsFocusManager* fm = nsFocusManager::GetFocusManager();
+  if (!fm) {
+    return NS_OK;
+  }
+  auto flags = nsFocusManager::ProgrammaticFocusFlags(dom::FocusOptions()) |
+               nsIFocusManager::FLAG_BYMOVEFOCUS;
+  auto type = aForward ? nsIFocusManager::MOVEFOCUS_FORWARD
+                       : nsIFocusManager::MOVEFOCUS_BACKWARD;
+  return fm->MoveFocus(win, aElt, type, flags, getter_AddRefs(result));
+}
+
+NS_IMETHODIMP
+nsXULCommandDispatcher::AddCommandUpdater(Element* aElement,
+                                          const nsAString& aEvents,
+                                          const nsAString& aTargets) {
+  MOZ_ASSERT(aElement != nullptr, "null ptr");
+  if (!aElement) return NS_ERROR_NULL_POINTER;
+
+  NS_ENSURE_TRUE(mDocument, NS_ERROR_UNEXPECTED);
+
+  nsresult rv = nsContentUtils::CheckSameOrigin(mDocument, aElement);
+
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  Updater* updater = mUpdaters;
+  Updater** link = &mUpdaters;
+
+  while (updater) {
+    if (updater->mElement == aElement) {
+#ifdef DEBUG
+      if (MOZ_LOG_TEST(gCommandLog, LogLevel::Debug)) {
+        nsAutoCString eventsC, targetsC, aeventsC, atargetsC;
+        LossyCopyUTF16toASCII(updater->mEvents, eventsC);
+        LossyCopyUTF16toASCII(updater->mTargets, targetsC);
+        CopyUTF16toUTF8(aEvents, aeventsC);
+        CopyUTF16toUTF8(aTargets, atargetsC);
+        MOZ_LOG(gCommandLog, LogLevel::Debug,
+                ("xulcmd[%p] replace %p(events=%s targets=%s) with (events=%s "
+                 "targets=%s)",
+                 this, aElement, eventsC.get(), targetsC.get(), aeventsC.get(),
+                 atargetsC.get()));
+      }
+#endif
+
+      // If the updater was already in the list, then replace
+      // (?) the 'events' and 'targets' filters with the new
+      // specification.
+      updater->mEvents = aEvents;
+      updater->mTargets = aTargets;
+      return NS_OK;
+    }
+
+    link = &(updater->mNext);
+    updater = updater->mNext;
+  }
+#ifdef DEBUG
+  if (MOZ_LOG_TEST(gCommandLog, LogLevel::Debug)) {
+    nsAutoCString aeventsC, atargetsC;
+    CopyUTF16toUTF8(aEvents, aeventsC);
+    CopyUTF16toUTF8(aTargets, atargetsC);
+
+    MOZ_LOG(gCommandLog, LogLevel::Debug,
+            ("xulcmd[%p] add     %p(events=%s targets=%s)", this, aElement,
+             aeventsC.get(), atargetsC.get()));
+  }
+#endif
+
+  // If we get here, this is a new updater. Append it to the list.
+  *link = new Updater(aElement, aEvents, aTargets);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXULCommandDispatcher::RemoveCommandUpdater(Element* aElement) {
+  MOZ_ASSERT(aElement != nullptr, "null ptr");
+  if (!aElement) return NS_ERROR_NULL_POINTER;
+
+  Updater* updater = mUpdaters;
+  Updater** link = &mUpdaters;
+
+  while (updater) {
+    if (updater->mElement == aElement) {
+#ifdef DEBUG
+      if (MOZ_LOG_TEST(gCommandLog, LogLevel::Debug)) {
+        nsAutoCString eventsC, targetsC;
+        LossyCopyUTF16toASCII(updater->mEvents, eventsC);
+        LossyCopyUTF16toASCII(updater->mTargets, targetsC);
+        MOZ_LOG(gCommandLog, LogLevel::Debug,
+                ("xulcmd[%p] remove  %p(events=%s targets=%s)", this, aElement,
+                 eventsC.get(), targetsC.get()));
+      }
+#endif
+
+      *link = updater->mNext;
+      delete updater;
+      return NS_OK;
+    }
+
+    link = &(updater->mNext);
+    updater = updater->mNext;
+  }
+
+  // Hmm. Not found. Oh well.
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXULCommandDispatcher::UpdateCommands(const nsAString& aEventName) {
+  if (mLocked) {
+    if (!mPendingUpdates.Contains(aEventName)) {
+      mPendingUpdates.AppendElement(aEventName);
+    }
+
+    return NS_OK;
+  }
+
+  nsAutoString id;
+  RefPtr<Element> element;
+  GetFocusedElement(getter_AddRefs(element));
+  if (element) {
+    element->GetAttr(nsGkAtoms::id, id);
+  }
+
+  nsCOMArray<nsIContent> updaters;
+
+  for (Updater* updater = mUpdaters; updater != nullptr;
+       updater = updater->mNext) {
+    // Skip any nodes that don't match our 'events' or 'targets'
+    // filters.
+    if (!Matches(updater->mEvents, aEventName)) continue;
+
+    if (!Matches(updater->mTargets, id)) continue;
+
+    nsIContent* content = updater->mElement;
+    NS_ASSERTION(content != nullptr, "mElement is null");
+    if (!content) return NS_ERROR_UNEXPECTED;
+
+    updaters.AppendObject(content);
+  }
+
+  for (nsIContent* content : updaters) {
+#ifdef DEBUG
+    if (MOZ_LOG_TEST(gCommandLog, LogLevel::Debug)) {
+      nsAutoCString aeventnameC;
+      CopyUTF16toUTF8(aEventName, aeventnameC);
+      MOZ_LOG(
+          gCommandLog, LogLevel::Debug,
+          ("xulcmd[%p] update %p event=%s", this, content, aeventnameC.get()));
+    }
+#endif
+
+    WidgetEvent event(true, eXULCommandUpdate);
+    EventDispatcher::Dispatch(MOZ_KnownLive(content), nullptr, &event);
+  }
+  return NS_OK;
+}
+
+bool nsXULCommandDispatcher::Matches(const nsString& aList,
+                                     const nsAString& aElement) {
+  if (aList.EqualsLiteral("*")) return true;  // match _everything_!
+
+  int32_t indx = aList.Find(PromiseFlatString(aElement));
+  if (indx == -1) return false;  // not in the list at all
+
+  // okay, now make sure it's not a substring snafu; e.g., 'ur'
+  // found inside of 'blur'.
+  if (indx > 0) {
+    char16_t ch = aList[indx - 1];
+    if (!nsCRT::IsAsciiSpace(ch) && ch != char16_t(',')) return false;
+  }
+
+  if (indx + aElement.Length() < aList.Length()) {
+    char16_t ch = aList[indx + aElement.Length()];
+    if (!nsCRT::IsAsciiSpace(ch) && ch != char16_t(',')) return false;
+  }
+
+  return true;
+}
+
+NS_IMETHODIMP
+nsXULCommandDispatcher::GetControllers(nsIControllers** aResult) {
+  nsCOMPtr<nsPIWindowRoot> root = GetWindowRoot();
+  NS_ENSURE_TRUE(root, NS_ERROR_FAILURE);
+
+  return root->GetControllers(false /* for any window */, aResult);
+}
+
+NS_IMETHODIMP
+nsXULCommandDispatcher::GetControllerForCommand(const char* aCommand,
+                                                nsIController** _retval) {
+  nsCOMPtr<nsPIWindowRoot> root = GetWindowRoot();
+  NS_ENSURE_TRUE(root, NS_ERROR_FAILURE);
+
+  return root->GetControllerForCommand(aCommand, false /* for any window */,
+                                       _retval);
+}
+
+NS_IMETHODIMP
+nsXULCommandDispatcher::Lock() {
+  // Since locking is used only as a performance optimization, we don't worry
+  // about nested lock calls. If that does happen, it just means we will unlock
+  // and process updates earlier.
+  mLocked = true;
+  return NS_OK;
+}
+
+// TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230)
+MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHODIMP nsXULCommandDispatcher::Unlock() {
+  if (mLocked) {
+    mLocked = false;
+
+    // Handle any pending updates one at a time. In the unlikely case where a
+    // lock is added during the update, break out.
+    while (!mLocked && mPendingUpdates.Length() > 0) {
+      nsString name = mPendingUpdates.ElementAt(0);
+      mPendingUpdates.RemoveElementAt(0);
+      UpdateCommands(name);
+    }
+  }
+
+  return NS_OK;
+}