chrome/browser/command_updater.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/command_updater.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/logging.h"
  10 #include "base/observer_list.h"
  11 #include "base/stl_util.h"
  12 #include "chrome/browser/command_observer.h"
  13 #include "chrome/browser/command_updater_delegate.h"
  14
  15 class CommandUpdater::Command {
  16  public:
  17   bool enabled;
  18   base::ObserverList<CommandObserver> observers;
  19
  20   Command() : enabled(true) {}
  21 };
  22
  23 CommandUpdater::CommandUpdater(CommandUpdaterDelegate* delegate)
  24     : delegate_(delegate) {
  25 }
  26
  27 CommandUpdater::~CommandUpdater() {
  28   STLDeleteContainerPairSecondPointers(commands_.begin(), commands_.end());
  29 }
  30
  31 bool CommandUpdater::SupportsCommand(int id) const {
  32   return commands_.find(id) != commands_.end();
  33 }
  34
  35 bool CommandUpdater::IsCommandEnabled(int id) const {
  36   const CommandMap::const_iterator command(commands_.find(id));
  37   if (command == commands_.end())
  38     return false;
  39   return command->second->enabled;
  40 }
  41
  42 bool CommandUpdater::ExecuteCommand(int id) {
  43   return ExecuteCommandWithDisposition(id, CURRENT_TAB);
  44 }
  45
  46 bool CommandUpdater::ExecuteCommandWithDisposition(
  47     int id,
  48     WindowOpenDisposition disposition) {
  49   if (SupportsCommand(id) && IsCommandEnabled(id)) {
  50     delegate_->ExecuteCommandWithDisposition(id, disposition);
  51     return true;
  52   }
  53   return false;
  54 }
  55
  56 void CommandUpdater::AddCommandObserver(int id, CommandObserver* observer) {
  57   GetCommand(id, true)->observers.AddObserver(observer);
  58 }
  59
  60 void CommandUpdater::RemoveCommandObserver(int id, CommandObserver* observer) {
  61   GetCommand(id, false)->observers.RemoveObserver(observer);
  62 }
  63
  64 void CommandUpdater::RemoveCommandObserver(CommandObserver* observer) {
  65   for (CommandMap::const_iterator it = commands_.begin();
  66        it != commands_.end();
  67        ++it) {
  68     Command* command = it->second;
  69     if (command)
  70       command->observers.RemoveObserver(observer);
  71   }
  72 }
  73
  74 void CommandUpdater::UpdateCommandEnabled(int id, bool enabled) {
  75   Command* command = GetCommand(id, true);
  76   if (command->enabled == enabled)
  77     return;  // Nothing to do.
  78   command->enabled = enabled;
  79   FOR_EACH_OBSERVER(CommandObserver, command->observers,
  80                     EnabledStateChangedForCommand(id, enabled));
  81 }
  82
  83 CommandUpdater::Command* CommandUpdater::GetCommand(int id, bool create) {
  84   bool supported = SupportsCommand(id);
  85   if (supported)
  86     return commands_[id];
  87   DCHECK(create);
  88   Command* command = new Command;
  89   commands_[id] = command;
  90   return command;
  91 }