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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/command_updater.h"
#include <algorithm>
#include "base/logging.h"
#include "base/observer_list.h"
#include "base/stl_util-inl.h"
CommandUpdater::CommandUpdaterDelegate::~CommandUpdaterDelegate() {
}
class CommandUpdater::Command {
public:
bool enabled;
ObserverList<CommandObserver> observers;
Command() : enabled(true) {}
};
CommandUpdater::CommandUpdater(CommandUpdaterDelegate* handler)
: delegate_(handler) {
}
CommandUpdater::~CommandUpdater() {
STLDeleteContainerPairSecondPointers(commands_.begin(), commands_.end());
}
bool CommandUpdater::IsCommandEnabled(int id) const {
const CommandMap::const_iterator command(commands_.find(id));
if (command == commands_.end())
return false;
return command->second->enabled;
}
bool CommandUpdater::SupportsCommand(int id) const {
return commands_.find(id) != commands_.end();
}
void CommandUpdater::ExecuteCommand(int id) {
if (IsCommandEnabled(id))
delegate_->ExecuteCommand(id);
}
CommandUpdater::CommandObserver::~CommandObserver() {
}
void CommandUpdater::UpdateCommandEnabled(int id, bool enabled) {
Command* command = GetCommand(id, true);
if (command->enabled == enabled)
return; // Nothing to do.
command->enabled = enabled;
FOR_EACH_OBSERVER(CommandObserver, command->observers,
EnabledStateChangedForCommand(id, enabled));
}
CommandUpdater::Command* CommandUpdater::GetCommand(int id, bool create) {
bool supported = SupportsCommand(id);
if (supported)
return commands_[id];
DCHECK(create);
Command* command = new Command;
commands_[id] = command;
return command;
}
void CommandUpdater::AddCommandObserver(int id, CommandObserver* observer) {
GetCommand(id, true)->observers.AddObserver(observer);
}
void CommandUpdater::RemoveCommandObserver(int id, CommandObserver* observer) {
GetCommand(id, false)->observers.RemoveObserver(observer);
}
void CommandUpdater::RemoveCommandObserver(CommandObserver* observer) {
for (CommandMap::const_iterator it = commands_.begin();
it != commands_.end();
++it) {
Command* command = it->second;
if (command)
command->observers.RemoveObserver(observer);
}
}
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