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-rw-r--r--dom/commandhandler/nsCommandManager.cpp240
1 files changed, 240 insertions, 0 deletions
diff --git a/dom/commandhandler/nsCommandManager.cpp b/dom/commandhandler/nsCommandManager.cpp
new file mode 100644
index 0000000000..1c8d7d79d2
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+++ b/dom/commandhandler/nsCommandManager.cpp
@@ -0,0 +1,240 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 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/. */
+
+#include "nsString.h"
+
+#include "nsIController.h"
+#include "nsIControllers.h"
+#include "nsIObserver.h"
+
+#include "nsServiceManagerUtils.h"
+
+#include "nsContentUtils.h"
+#include "nsPIDOMWindow.h"
+#include "nsPIWindowRoot.h"
+
+#include "nsCOMArray.h"
+
+#include "nsCommandManager.h"
+
+nsCommandManager::nsCommandManager(mozIDOMWindowProxy* aWindow)
+ : mWindow(aWindow) {
+ MOZ_DIAGNOSTIC_ASSERT(mWindow);
+}
+
+nsCommandManager::~nsCommandManager() = default;
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsCommandManager)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsCommandManager)
+ tmp->mObserversTable.Clear();
+ NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsCommandManager)
+ for (const auto& entry : tmp->mObserversTable) {
+ nsCommandManager::ObserverList* observers = entry.GetWeak();
+ int32_t numItems = observers->Length();
+ for (int32_t i = 0; i < numItems; ++i) {
+ cb.NoteXPCOMChild(observers->ElementAt(i));
+ }
+ }
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsCommandManager)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(nsCommandManager)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsCommandManager)
+ NS_INTERFACE_MAP_ENTRY(nsICommandManager)
+ NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
+ NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsICommandManager)
+NS_INTERFACE_MAP_END
+
+void nsCommandManager::CommandStatusChanged(const char* aCommandName) {
+ ObserverList* commandObservers;
+ mObserversTable.Get(aCommandName, &commandObservers);
+
+ if (commandObservers) {
+ // XXX Should we worry about observers removing themselves from Observe()?
+ int32_t i, numItems = commandObservers->Length();
+ for (i = 0; i < numItems; ++i) {
+ nsCOMPtr<nsIObserver> observer = commandObservers->ElementAt(i);
+ // should we get the command state to pass here? This might be expensive.
+ observer->Observe(NS_ISUPPORTS_CAST(nsICommandManager*, this),
+ aCommandName, u"command_status_changed");
+ }
+ }
+}
+
+#if 0
+# pragma mark -
+#endif
+
+NS_IMETHODIMP
+nsCommandManager::AddCommandObserver(nsIObserver* aCommandObserver,
+ const char* aCommandToObserve) {
+ NS_ENSURE_ARG(aCommandObserver);
+
+ // XXX todo: handle special cases of aCommandToObserve being null, or empty
+
+ // for each command in the table, we make a list of observers for that command
+ auto* const commandObservers =
+ mObserversTable.GetOrInsertNew(aCommandToObserve);
+
+ // need to check that this command observer hasn't already been registered
+ int32_t existingIndex = commandObservers->IndexOf(aCommandObserver);
+ if (existingIndex == -1) {
+ commandObservers->AppendElement(aCommandObserver);
+ } else {
+ NS_WARNING("Registering command observer twice on the same command");
+ }
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsCommandManager::RemoveCommandObserver(nsIObserver* aCommandObserver,
+ const char* aCommandObserved) {
+ NS_ENSURE_ARG(aCommandObserver);
+
+ // XXX todo: handle special cases of aCommandToObserve being null, or empty
+
+ ObserverList* commandObservers;
+ if (!mObserversTable.Get(aCommandObserved, &commandObservers)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ commandObservers->RemoveElement(aCommandObserver);
+
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsCommandManager::IsCommandSupported(const char* aCommandName,
+ mozIDOMWindowProxy* aTargetWindow,
+ bool* aResult) {
+ NS_ENSURE_ARG_POINTER(aResult);
+
+ nsCOMPtr<nsIController> controller;
+ GetControllerForCommand(aCommandName, aTargetWindow,
+ getter_AddRefs(controller));
+ *aResult = (controller.get() != nullptr);
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+nsCommandManager::IsCommandEnabled(const char* aCommandName,
+ mozIDOMWindowProxy* aTargetWindow,
+ bool* aResult) {
+ NS_ENSURE_ARG_POINTER(aResult);
+ if (!aCommandName) {
+ *aResult = false;
+ return NS_OK;
+ }
+ *aResult = IsCommandEnabled(nsDependentCString(aCommandName), aTargetWindow);
+ return NS_OK;
+}
+
+bool nsCommandManager::IsCommandEnabled(const nsCString& aCommandName,
+ mozIDOMWindowProxy* aTargetWindow) {
+ nsCOMPtr<nsIController> controller;
+ GetControllerForCommand(aCommandName.get(), aTargetWindow,
+ getter_AddRefs(controller));
+ if (!controller) {
+ return false;
+ }
+
+ bool enabled = false;
+ controller->IsCommandEnabled(aCommandName.get(), &enabled);
+ return enabled;
+}
+
+NS_IMETHODIMP
+nsCommandManager::GetCommandState(const char* aCommandName,
+ mozIDOMWindowProxy* aTargetWindow,
+ nsICommandParams* aCommandParams) {
+ nsCOMPtr<nsIController> controller;
+ nsAutoString tValue;
+ nsresult rv = GetControllerForCommand(aCommandName, aTargetWindow,
+ getter_AddRefs(controller));
+ if (!controller) {
+ return NS_ERROR_FAILURE;
+ }
+
+ nsCOMPtr<nsICommandController> commandController =
+ do_QueryInterface(controller);
+ if (commandController) {
+ rv = commandController->GetCommandStateWithParams(aCommandName,
+ aCommandParams);
+ } else {
+ rv = NS_ERROR_NOT_IMPLEMENTED;
+ }
+ return rv;
+}
+
+NS_IMETHODIMP
+nsCommandManager::DoCommand(const char* aCommandName,
+ nsICommandParams* aCommandParams,
+ mozIDOMWindowProxy* aTargetWindow) {
+ nsCOMPtr<nsIController> controller;
+ nsresult rv = GetControllerForCommand(aCommandName, aTargetWindow,
+ getter_AddRefs(controller));
+ if (!controller) {
+ return NS_ERROR_FAILURE;
+ }
+
+ nsCOMPtr<nsICommandController> commandController =
+ do_QueryInterface(controller);
+ if (commandController && aCommandParams) {
+ rv = commandController->DoCommandWithParams(aCommandName, aCommandParams);
+ } else {
+ rv = controller->DoCommand(aCommandName);
+ }
+ return rv;
+}
+
+nsresult nsCommandManager::GetControllerForCommand(
+ const char* aCommand, mozIDOMWindowProxy* aTargetWindow,
+ nsIController** aResult) {
+ nsresult rv = NS_ERROR_FAILURE;
+ *aResult = nullptr;
+
+ // check if we're in content or chrome
+ // if we're not chrome we must have a target window or we bail
+ if (!nsContentUtils::LegacyIsCallerChromeOrNativeCode()) {
+ if (!aTargetWindow) {
+ return rv;
+ }
+
+ // if a target window is specified, it must be the window we expect
+ if (aTargetWindow != mWindow) {
+ return NS_ERROR_FAILURE;
+ }
+ }
+
+ if (auto* targetWindow = nsPIDOMWindowOuter::From(aTargetWindow)) {
+ // get the controller for this particular window
+ nsCOMPtr<nsIControllers> controllers;
+ rv = targetWindow->GetControllers(getter_AddRefs(controllers));
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ if (!controllers) {
+ return NS_ERROR_FAILURE;
+ }
+
+ // dispatch the command
+ return controllers->GetControllerForCommand(aCommand, aResult);
+ }
+
+ auto* window = nsPIDOMWindowOuter::From(mWindow);
+ NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
+ nsCOMPtr<nsPIWindowRoot> root = window->GetTopWindowRoot();
+ NS_ENSURE_TRUE(root, NS_ERROR_FAILURE);
+
+ // no target window; send command to focus controller
+ return root->GetControllerForCommand(aCommand, false /* for any window */,
+ aResult);
+}