tor-browser

The Tor Browser
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nsControllerCommandTable.cpp (3880B)

      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 "nsControllerCommandTable.h"
      8 
      9 #include "mozilla/ClearOnShutdown.h"
     10 #include "mozilla/ControllerCommand.h"
     11 #include "mozilla/EditorController.h"
     12 #include "mozilla/HTMLEditorController.h"
     13 #include "mozilla/StaticPtr.h"
     14 #include "nsGlobalWindowCommands.h"
     15 #include "nsString.h"
     16 
     17 using mozilla::ControllerCommand;
     18 
     19 // this value is used to size the hash table. Just a sensible upper bound
     20 #define NUM_COMMANDS_LENGTH 32
     21 
     22 nsControllerCommandTable::nsControllerCommandTable()
     23    : mCommandsTable(NUM_COMMANDS_LENGTH) {}
     24 
     25 nsControllerCommandTable::~nsControllerCommandTable() = default;
     26 
     27 void nsControllerCommandTable::RegisterCommand(const nsACString& aName,
     28                                               ControllerCommand* aCommand) {
     29  MOZ_DIAGNOSTIC_ASSERT(mMutable);
     30  mCommandsTable.InsertOrUpdate(aName, aCommand);
     31 }
     32 
     33 void nsControllerCommandTable::UnregisterCommand(const nsACString& aCommandName,
     34                                                 ControllerCommand* aCommand) {
     35  MOZ_DIAGNOSTIC_ASSERT(mMutable);
     36  mCommandsTable.Remove(aCommandName);
     37 }
     38 
     39 ControllerCommand* nsControllerCommandTable::FindCommandHandler(
     40    const nsACString& aCommandName) const {
     41  return mCommandsTable.GetWeak(aCommandName);
     42 }
     43 
     44 bool nsControllerCommandTable::IsCommandEnabled(const nsACString& aCommandName,
     45                                                nsISupports* aContext) const {
     46  RefPtr handler = FindCommandHandler(aCommandName);
     47  if (!handler) {
     48    NS_WARNING(
     49        "Controller command table asked about a command that it does "
     50        "not handle");
     51    return false;
     52  }
     53  return handler->IsCommandEnabled(aCommandName, aContext);
     54 }
     55 
     56 void nsControllerCommandTable::GetSupportedCommands(
     57    nsTArray<nsCString>& aCommands) const {
     58  mozilla::AppendToArray(aCommands, mCommandsTable.Keys());
     59 }
     60 
     61 using CommandTableRegistrar = void (*)(nsControllerCommandTable*);
     62 
     63 static nsControllerCommandTable* EnsureCommandTableWithCommands(
     64    mozilla::StaticRefPtr<nsControllerCommandTable>& aTable,
     65    CommandTableRegistrar aRegistrar) {
     66  if (!aTable) {
     67    aTable = new nsControllerCommandTable();
     68    aRegistrar(aTable);
     69    aTable->MakeImmutable();
     70    ClearOnShutdown(&aTable);
     71  }
     72  return aTable;
     73 }
     74 
     75 // static
     76 nsControllerCommandTable* nsControllerCommandTable::EditorCommandTable() {
     77  static mozilla::StaticRefPtr<nsControllerCommandTable> sTable;
     78  return EnsureCommandTableWithCommands(
     79      sTable, mozilla::EditorController::RegisterEditorCommands);
     80 }
     81 
     82 // static
     83 nsControllerCommandTable* nsControllerCommandTable::EditingCommandTable() {
     84  static mozilla::StaticRefPtr<nsControllerCommandTable> sTable;
     85  return EnsureCommandTableWithCommands(
     86      sTable, mozilla::EditorController::RegisterEditingCommands);
     87 }
     88 
     89 // static
     90 nsControllerCommandTable* nsControllerCommandTable::HTMLEditorCommandTable() {
     91  static mozilla::StaticRefPtr<nsControllerCommandTable> sTable;
     92  return EnsureCommandTableWithCommands(
     93      sTable, mozilla::HTMLEditorController::RegisterHTMLEditorCommands);
     94 }
     95 
     96 // static
     97 nsControllerCommandTable*
     98 nsControllerCommandTable::HTMLEditorDocStateCommandTable() {
     99  static mozilla::StaticRefPtr<nsControllerCommandTable> sTable;
    100  return EnsureCommandTableWithCommands(
    101      sTable, mozilla::HTMLEditorController::RegisterEditorDocStateCommands);
    102 }
    103 
    104 // static
    105 nsControllerCommandTable* nsControllerCommandTable::WindowCommandTable() {
    106  static mozilla::StaticRefPtr<nsControllerCommandTable> sTable;
    107  return EnsureCommandTableWithCommands(
    108      sTable, nsWindowCommandRegistration::RegisterWindowCommands);
    109 }