Split a part of code managing accelerators from views::FocusManager.

ui/base/accelerator_manager.cc

+// Copyright (c) 2011 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 "ui/base/accelerator_manager.h"
+
+#include <algorithm>
+
+#include "base/logging.h"
+
+namespace ui {
+
+AcceleratorManager::AcceleratorManager() {
+}
+
+AcceleratorManager::~AcceleratorManager() {
+}
+
+void AcceleratorManager::Register(const Accelerator& accelerator,
+                                  AcceleratorTarget* target) {
+  AcceleratorTargetList& targets = accelerators_[accelerator];
+  DCHECK(std::find(targets.begin(), targets.end(), target) == targets.end())
+      << "Registering the same target multiple times";
+  targets.push_front(target);
+}
+
+void AcceleratorManager::Unregister(const Accelerator& accelerator,
+                                    AcceleratorTarget* target) {
+  AcceleratorMap::iterator map_iter = accelerators_.find(accelerator);
+  if (map_iter == accelerators_.end()) {
+    NOTREACHED() << "Unregistering non-existing accelerator";
+    return;
+  }
+
+  AcceleratorTargetList* targets = &map_iter->second;
+  AcceleratorTargetList::iterator target_iter =
+      std::find(targets->begin(), targets->end(), target);
+  if (target_iter == targets->end()) {
+    NOTREACHED() << "Unregistering accelerator for wrong target";
+    return;
+  }
+
+  targets->erase(target_iter);
+}
+
+void AcceleratorManager::UnregisterAll(AcceleratorTarget* target) {
+  for (AcceleratorMap::iterator map_iter = accelerators_.begin();
+       map_iter != accelerators_.end(); ++map_iter) {
+    AcceleratorTargetList* targets = &map_iter->second;
+    targets->remove(target);
+  }
+}
+
+bool AcceleratorManager::Process(const Accelerator& accelerator) {
+  AcceleratorMap::iterator map_iter = accelerators_.find(accelerator);
+  if (map_iter != accelerators_.end()) {
+    // We have to copy the target list here, because an AcceleratorPressed
+    // event handler may modify the list.
+    AcceleratorTargetList targets(map_iter->second);
+    for (AcceleratorTargetList::iterator iter = targets.begin();
+         iter != targets.end(); ++iter) {
+      if ((*iter)->AcceleratorPressed(accelerator))
+        return true;
+    }
+  }
+  return false;
+}
+
+AcceleratorTarget* AcceleratorManager::GetCurrentTarget(
+    const Accelerator& accelerator) const {
+  AcceleratorMap::const_iterator map_iter = accelerators_.find(accelerator);
+  if (map_iter == accelerators_.end() || map_iter->second.empty())
+    return NULL;
+  return map_iter->second.front();
+}
+
+}  // namespace ui