1 // Copyright (c) 2006-2008 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-inl.h"
12
~CommandUpdaterDelegate()13 CommandUpdater::CommandUpdaterDelegate::~CommandUpdaterDelegate() {
14 }
15
16 class CommandUpdater::Command {
17 public:
18 bool enabled;
19 ObserverList<CommandObserver> observers;
20
Command()21 Command() : enabled(true) {}
22 };
23
CommandUpdater(CommandUpdaterDelegate * handler)24 CommandUpdater::CommandUpdater(CommandUpdaterDelegate* handler)
25 : delegate_(handler) {
26 }
27
~CommandUpdater()28 CommandUpdater::~CommandUpdater() {
29 STLDeleteContainerPairSecondPointers(commands_.begin(), commands_.end());
30 }
31
IsCommandEnabled(int id) const32 bool CommandUpdater::IsCommandEnabled(int id) const {
33 const CommandMap::const_iterator command(commands_.find(id));
34 if (command == commands_.end())
35 return false;
36 return command->second->enabled;
37 }
38
SupportsCommand(int id) const39 bool CommandUpdater::SupportsCommand(int id) const {
40 return commands_.find(id) != commands_.end();
41 }
42
ExecuteCommand(int id)43 void CommandUpdater::ExecuteCommand(int id) {
44 if (IsCommandEnabled(id))
45 delegate_->ExecuteCommand(id);
46 }
47
~CommandObserver()48 CommandUpdater::CommandObserver::~CommandObserver() {
49 }
50
UpdateCommandEnabled(int id,bool enabled)51 void CommandUpdater::UpdateCommandEnabled(int id, bool enabled) {
52 Command* command = GetCommand(id, true);
53 if (command->enabled == enabled)
54 return; // Nothing to do.
55 command->enabled = enabled;
56 FOR_EACH_OBSERVER(CommandObserver, command->observers,
57 EnabledStateChangedForCommand(id, enabled));
58 }
59
GetCommand(int id,bool create)60 CommandUpdater::Command* CommandUpdater::GetCommand(int id, bool create) {
61 bool supported = SupportsCommand(id);
62 if (supported)
63 return commands_[id];
64 DCHECK(create);
65 Command* command = new Command;
66 commands_[id] = command;
67 return command;
68 }
69
AddCommandObserver(int id,CommandObserver * observer)70 void CommandUpdater::AddCommandObserver(int id, CommandObserver* observer) {
71 GetCommand(id, true)->observers.AddObserver(observer);
72 }
73
RemoveCommandObserver(int id,CommandObserver * observer)74 void CommandUpdater::RemoveCommandObserver(int id, CommandObserver* observer) {
75 GetCommand(id, false)->observers.RemoveObserver(observer);
76 }
77
RemoveCommandObserver(CommandObserver * observer)78 void CommandUpdater::RemoveCommandObserver(CommandObserver* observer) {
79 for (CommandMap::const_iterator it = commands_.begin();
80 it != commands_.end();
81 ++it) {
82 Command* command = it->second;
83 if (command)
84 command->observers.RemoveObserver(observer);
85 }
86 }
87