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Diffstat (limited to '')
| -rw-r--r-- | dom/commandhandler/nsCommandManager.cpp | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/dom/commandhandler/nsCommandManager.cpp b/dom/commandhandler/nsCommandManager.cpp new file mode 100644 index 0000000000..6a8259e9ff --- /dev/null +++ b/dom/commandhandler/nsCommandManager.cpp @@ -0,0 +1,242 @@ +/* -*- 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 (auto iter = tmp->mObserversTable.Iter(); !iter.Done(); iter.Next()) { + nsCommandManager::ObserverList* observers = iter.UserData(); + 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 + const auto& commandObservers = + mObserversTable.LookupForAdd(aCommandToObserve).OrInsert([]() { + return new ObserverList; + }); + + // 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); +} |