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      1 // Copyright (c) 2013 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/extensions/global_shortcut_listener.h"
      6 #include "chrome/browser/profiles/profile.h"
      7 #include "ui/base/accelerators/accelerator.h"
      8 
      9 namespace extensions {
     10 
     11 GlobalShortcutListener::GlobalShortcutListener() {
     12 }
     13 
     14 GlobalShortcutListener::~GlobalShortcutListener() {
     15   DCHECK(accelerator_map_.empty());  // Make sure we've cleaned up.
     16 }
     17 
     18 void GlobalShortcutListener::RegisterAccelerator(
     19     const ui::Accelerator& accelerator, Observer* observer) {
     20   AcceleratorMap::const_iterator it = accelerator_map_.find(accelerator);
     21   if (it == accelerator_map_.end()) {
     22     if (accelerator_map_.empty())
     23       GlobalShortcutListener::GetInstance()->StartListening();
     24     Observers* observers = new Observers;
     25     observers->AddObserver(observer);
     26     accelerator_map_[accelerator] = observers;
     27   } else {
     28     // Make sure we don't register the same accelerator twice.
     29     DCHECK(!accelerator_map_[accelerator]->HasObserver(observer));
     30     accelerator_map_[accelerator]->AddObserver(observer);
     31   }
     32 }
     33 
     34 void GlobalShortcutListener::UnregisterAccelerator(
     35     const ui::Accelerator& accelerator, Observer* observer) {
     36   AcceleratorMap::iterator it = accelerator_map_.find(accelerator);
     37   DCHECK(it != accelerator_map_.end());
     38   DCHECK(it->second->HasObserver(observer));
     39   it->second->RemoveObserver(observer);
     40   if (!it->second->might_have_observers()) {
     41     accelerator_map_.erase(it);
     42     if (accelerator_map_.empty())
     43       GlobalShortcutListener::GetInstance()->StopListening();
     44   }
     45 }
     46 
     47 void GlobalShortcutListener::NotifyKeyPressed(
     48     const ui::Accelerator& accelerator) {
     49   AcceleratorMap::iterator iter = accelerator_map_.find(accelerator);
     50   if (iter == accelerator_map_.end()) {
     51     // This should never occur, because if it does, we have failed to unregister
     52     // or failed to clean up the map after unregistering the shortcut.
     53     NOTREACHED();
     54     return;  // No-one is listening to this key.
     55   }
     56   // The observer list should not be empty.
     57   DCHECK(iter->second->might_have_observers());
     58 
     59   FOR_EACH_OBSERVER(Observer, *(iter->second), OnKeyPressed(accelerator));
     60 }
     61 
     62 }  // namespace extensions
     63