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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_chromeos.h"
      6 
      7 #include "ash/accelerators/accelerator_controller.h"
      8 #include "ash/shell.h"
      9 #include "content/public/browser/browser_thread.h"
     10 
     11 using content::BrowserThread;
     12 
     13 namespace extensions {
     14 
     15 // static
     16 GlobalShortcutListener* GlobalShortcutListener::GetInstance() {
     17   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     18   static GlobalShortcutListenerChromeOS* instance =
     19       new GlobalShortcutListenerChromeOS();
     20   return instance;
     21 }
     22 
     23 GlobalShortcutListenerChromeOS::GlobalShortcutListenerChromeOS()
     24     : is_listening_(false) {
     25   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     26 }
     27 
     28 GlobalShortcutListenerChromeOS::~GlobalShortcutListenerChromeOS() {
     29   if (is_listening_)
     30     StopListening();
     31 }
     32 
     33 void GlobalShortcutListenerChromeOS::StartListening() {
     34   DCHECK(!is_listening_);  // Don't start twice.
     35   is_listening_ = true;
     36 }
     37 
     38 void GlobalShortcutListenerChromeOS::StopListening() {
     39   DCHECK(is_listening_);  // No point if we are not already listening.
     40   is_listening_ = false;
     41 }
     42 
     43 bool GlobalShortcutListenerChromeOS::RegisterAcceleratorImpl(
     44     const ui::Accelerator& accelerator) {
     45   ash::AcceleratorController* controller =
     46       ash::Shell::GetInstance()->accelerator_controller();
     47   if (controller->IsRegistered(accelerator))
     48     return false;
     49 
     50   // TODO(dtseng): Support search key mapping.
     51   controller->Register(accelerator, this);
     52   return controller->IsRegistered(accelerator);
     53 }
     54 
     55 void GlobalShortcutListenerChromeOS::UnregisterAcceleratorImpl(
     56     const ui::Accelerator& accelerator) {
     57   // This code path gets called during object destruction.
     58   if (!ash::Shell::HasInstance())
     59     return;
     60   ash::Shell::GetInstance()->accelerator_controller()->Unregister(accelerator,
     61                                                                   this);
     62 }
     63 
     64 bool GlobalShortcutListenerChromeOS::AcceleratorPressed(
     65     const ui::Accelerator& accelerator) {
     66   DCHECK(is_listening_);
     67   ash::AcceleratorController* controller =
     68       ash::Shell::GetInstance()->accelerator_controller();
     69   ash::AcceleratorController::AcceleratorProcessingRestriction restriction =
     70       controller->GetCurrentAcceleratorRestriction();
     71   if (restriction == ash::AcceleratorController::RESTRICTION_NONE) {
     72     NotifyKeyPressed(accelerator);
     73     return true;
     74   }
     75   return restriction == ash::AcceleratorController::
     76                             RESTRICTION_PREVENT_PROCESSING_AND_PROPAGATION;
     77 }
     78 
     79 bool GlobalShortcutListenerChromeOS::CanHandleAccelerators() const {
     80   return is_listening_;
     81 }
     82 
     83 }  // namespace extensions
     84