gecko-dev/dom/commandhandler/nsControllerCommandTable.cpp

/* -*- 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 "nsIControllerCommand.h"
#include "nsControllerCommandTable.h"
#include "nsGlobalWindowCommands.h"
#include "mozilla/EditorController.h"
#include "mozilla/HTMLEditorController.h"

// this value is used to size the hash table. Just a sensible upper bound
#define NUM_COMMANDS_LENGTH 32

nsControllerCommandTable::nsControllerCommandTable()
    : mCommandsTable(NUM_COMMANDS_LENGTH), mMutable(true) {}

nsControllerCommandTable::~nsControllerCommandTable() {}

NS_IMPL_ISUPPORTS(nsControllerCommandTable, nsIControllerCommandTable,
                  nsISupportsWeakReference)

NS_IMETHODIMP
nsControllerCommandTable::MakeImmutable(void) {
  mMutable = false;
  return NS_OK;
}

NS_IMETHODIMP
nsControllerCommandTable::RegisterCommand(const char* aCommandName,
                                          nsIControllerCommand* aCommand) {
  NS_ENSURE_TRUE(mMutable, NS_ERROR_FAILURE);

  mCommandsTable.Put(nsDependentCString(aCommandName), aCommand);

  return NS_OK;
}

NS_IMETHODIMP
nsControllerCommandTable::UnregisterCommand(const char* aCommandName,
                                            nsIControllerCommand* aCommand) {
  NS_ENSURE_TRUE(mMutable, NS_ERROR_FAILURE);

  nsDependentCString commandKey(aCommandName);
  if (!mCommandsTable.Get(commandKey, nullptr)) {
    return NS_ERROR_FAILURE;
  }

  mCommandsTable.Remove(commandKey);
  return NS_OK;
}

NS_IMETHODIMP
nsControllerCommandTable::FindCommandHandler(const char* aCommandName,
                                             nsIControllerCommand** aResult) {
  NS_ENSURE_ARG_POINTER(aResult);

  *aResult = nullptr;

  nsCOMPtr<nsIControllerCommand> foundCommand;
  mCommandsTable.Get(nsDependentCString(aCommandName),
                     getter_AddRefs(foundCommand));
  if (!foundCommand) {
    return NS_ERROR_FAILURE;
  }

  foundCommand.forget(aResult);
  return NS_OK;
}

NS_IMETHODIMP
nsControllerCommandTable::IsCommandEnabled(const char* aCommandName,
                                           nsISupports* aCommandRefCon,
                                           bool* aResult) {
  NS_ENSURE_ARG_POINTER(aResult);

  *aResult = false;

  nsCOMPtr<nsIControllerCommand> commandHandler;
  FindCommandHandler(aCommandName, getter_AddRefs(commandHandler));
  if (!commandHandler) {
    NS_WARNING(
        "Controller command table asked about a command that it does "
        "not handle");
    return NS_OK;
  }

  return commandHandler->IsCommandEnabled(aCommandName, aCommandRefCon,
                                          aResult);
}

NS_IMETHODIMP
nsControllerCommandTable::UpdateCommandState(const char* aCommandName,
                                             nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIControllerCommand> commandHandler;
  FindCommandHandler(aCommandName, getter_AddRefs(commandHandler));
  if (!commandHandler) {
    NS_WARNING(
        "Controller command table asked to update the state of a "
        "command that it does not handle");
    return NS_OK;
  }

  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
nsControllerCommandTable::SupportsCommand(const char* aCommandName,
                                          nsISupports* aCommandRefCon,
                                          bool* aResult) {
  NS_ENSURE_ARG_POINTER(aResult);

  // XXX: need to check the readonly and disabled states

  *aResult = false;

  nsCOMPtr<nsIControllerCommand> commandHandler;
  FindCommandHandler(aCommandName, getter_AddRefs(commandHandler));

  *aResult = (commandHandler.get() != nullptr);
  return NS_OK;
}

NS_IMETHODIMP
nsControllerCommandTable::DoCommand(const char* aCommandName,
                                    nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIControllerCommand> commandHandler;
  FindCommandHandler(aCommandName, getter_AddRefs(commandHandler));
  if (!commandHandler) {
    NS_WARNING(
        "Controller command table asked to do a command that it does "
        "not handle");
    return NS_OK;
  }

  return commandHandler->DoCommand(aCommandName, aCommandRefCon);
}

NS_IMETHODIMP
nsControllerCommandTable::DoCommandParams(const char* aCommandName,
                                          nsICommandParams* aParams,
                                          nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIControllerCommand> commandHandler;
  FindCommandHandler(aCommandName, getter_AddRefs(commandHandler));
  if (!commandHandler) {
    NS_WARNING(
        "Controller command table asked to do a command that it does "
        "not handle");
    return NS_OK;
  }
  return commandHandler->DoCommandParams(aCommandName, aParams, aCommandRefCon);
}

NS_IMETHODIMP
nsControllerCommandTable::GetCommandState(const char* aCommandName,
                                          nsICommandParams* aParams,
                                          nsISupports* aCommandRefCon) {
  nsCOMPtr<nsIControllerCommand> commandHandler;
  FindCommandHandler(aCommandName, getter_AddRefs(commandHandler));
  if (!commandHandler) {
    NS_WARNING(
        "Controller command table asked to do a command that it does "
        "not handle");
    return NS_OK;
  }
  return commandHandler->GetCommandStateParams(aCommandName, aParams,
                                               aCommandRefCon);
}

NS_IMETHODIMP
nsControllerCommandTable::GetSupportedCommands(nsTArray<nsCString>& aCommands) {
  aCommands.SetCapacity(mCommandsTable.Count());

  for (auto iter = mCommandsTable.Iter(); !iter.Done(); iter.Next()) {
    aCommands.AppendElement(iter.Key());
  }
  return NS_OK;
}

typedef nsresult (*CommandTableRegistrar)(nsControllerCommandTable*);

static already_AddRefed<nsControllerCommandTable>
CreateCommandTableWithCommands(CommandTableRegistrar aRegistrar) {
  RefPtr<nsControllerCommandTable> commandTable =
      new nsControllerCommandTable();

  nsresult rv = aRegistrar(commandTable);
  if (NS_FAILED(rv)) return nullptr;

  // we don't know here whether we're being created as an instance,
  // or a service, so we can't become immutable

  return commandTable.forget();
}

// static
already_AddRefed<nsControllerCommandTable>
nsControllerCommandTable::CreateEditorCommandTable() {
  return CreateCommandTableWithCommands(
      EditorController::RegisterEditorCommands);
}

// static
already_AddRefed<nsControllerCommandTable>
nsControllerCommandTable::CreateEditingCommandTable() {
  return CreateCommandTableWithCommands(
      EditorController::RegisterEditingCommands);
}

// static
already_AddRefed<nsControllerCommandTable>
nsControllerCommandTable::CreateHTMLEditorCommandTable() {
  return CreateCommandTableWithCommands(
      HTMLEditorController::RegisterHTMLEditorCommands);
}

// static
already_AddRefed<nsControllerCommandTable>
nsControllerCommandTable::CreateHTMLEditorDocStateCommandTable() {
  return CreateCommandTableWithCommands(
      HTMLEditorController::RegisterEditorDocStateCommands);
}

// static
already_AddRefed<nsControllerCommandTable>
nsControllerCommandTable::CreateWindowCommandTable() {
  return CreateCommandTableWithCommands(
      nsWindowCommandRegistration::RegisterWindowCommands);
}