InputManager/AcceleratorManager for athena

athena/input/accelerator_manager_impl.cc

+// Copyright 2014 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 "athena/input/accelerator_manager_impl.h"
+
+#include "athena/input/public/input_manager.h"
+#include "base/logging.h"
+#include "ui/aura/window.h"
+#include "ui/base/accelerators/accelerator_manager.h"
+#include "ui/events/event.h"
+#include "ui/events/event_target.h"
+#include "ui/wm/core/accelerator_delegate.h"
+#include "ui/wm/core/accelerator_filter.h"
+#include "ui/wm/core/nested_accelerator_controller.h"
+#include "ui/wm/core/nested_accelerator_delegate.h"
+#include "ui/wm/public/dispatcher_client.h"
+
+namespace athena {
+
+namespace {
+
+// Accelerators inside nested message loop are handled by
+// wm::NestedAcceleratorController while accelerators in normal case are
+// handled by wm::AcceleratorFilter. These delegates act bridges in these
+// two different environment so that AcceleratorManagerImpl can handle
+// accelerators in an uniform way.
+
+class NestedAcceleratorDelegate : public wm::NestedAcceleratorDelegate {
+ public:
+  explicit NestedAcceleratorDelegate(
+      AcceleratorManagerImpl* accelerator_manager)
+      : accelerator_manager_(accelerator_manager) {}
+  virtual ~NestedAcceleratorDelegate() {}
+
+ private:
+  // wm::NestedAcceleratorDelegate:
+  virtual Result ProcessAccelerator(
+      const ui::Accelerator& accelerator) OVERRIDE {
+    return accelerator_manager_->ProcessAccelerator(accelerator)
+               ? RESULT_PROCESSED
+               : RESULT_NOT_PROCESSED;
+  }
+
+  AcceleratorManagerImpl* accelerator_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(NestedAcceleratorDelegate);
+};
+
+class AcceleratorDelegate : public wm::AcceleratorDelegate {
+ public:
+  explicit AcceleratorDelegate(AcceleratorManagerImpl* accelerator_manager)
+      : accelerator_manager_(accelerator_manager) {}
+  virtual ~AcceleratorDelegate() {}
+
+ private:
+  // wm::AcceleratorDelegate:
+  virtual bool ProcessAccelerator(const ui::KeyEvent& event,
+                                  const ui::Accelerator& accelerator,
+                                  KeyType key_type) OVERRIDE {
+    aura::Window* target = static_cast<aura::Window*>(event.target());
+    if (!target->IsRootWindow() &&
+        !accelerator_manager_->IsReservedAccelerator(accelerator)) {
+      // TODO(oshima): do the same when the active window is in fullscreen.
+      return false;
+    }
+    return accelerator_manager_->ProcessAccelerator(accelerator);
+  }
+
+  AcceleratorManagerImpl* accelerator_manager_;
+  DISALLOW_COPY_AND_ASSIGN(AcceleratorDelegate);
+};
+
+}  // namespace
+
+class AcceleratorManagerImpl::InternalData {
+ public:
+  InternalData(int command_id, AcceleratorHandler* handler, int flags)
+      : command_id_(command_id), handler_(handler), flags_(flags) {}
+
+  bool IsNonAutoRepeatable() const { return flags_ & AF_NON_AUTO_REPEATABLE; }
+  bool IsDebug() const { return flags_ & AF_DEBUG; }
+  bool IsReserved() const { return flags_ & AF_RESERVED; }
+
+  bool IsCommandEnabled() const {
+    return handler_->IsCommandEnabled(command_id_);
+  }
+
+  bool OnAcceleratorFired(const ui::Accelerator& accelerator) {
+    return handler_->OnAcceleratorFired(command_id_, accelerator);
+  }
+
+ private:
+  int command_id_;
+  AcceleratorHandler* handler_;
+  int flags_;
+
+  // This class is copyable by design.
+};
+
+AcceleratorManagerImpl::AcceleratorManagerImpl()
+    : accelerator_manager_(new ui::AcceleratorManager) {
+}
+
+AcceleratorManagerImpl::~AcceleratorManagerImpl() {
+  nested_accelerator_controller_.reset();
+  accelerator_filter_.reset();
+}
+
+void AcceleratorManagerImpl::Init() {
+  ui::EventTarget* toplevel = InputManager::Get()->GetTopmostEventTarget();
+  nested_accelerator_controller_.reset(
+      new wm::NestedAcceleratorController(new NestedAcceleratorDelegate(this)));
+
+  scoped_ptr<wm::AcceleratorDelegate> accelerator_delegate(
+      new AcceleratorDelegate(this));
+
+  accelerator_filter_.reset(
+      new wm::AcceleratorFilter(accelerator_delegate.Pass()));
+  toplevel->AddPreTargetHandler(accelerator_filter_.get());
+}
+
+void AcceleratorManagerImpl::OnRootWindowCreated(aura::Window* root_window) {
+  aura::client::SetDispatcherClient(root_window,
+                                    nested_accelerator_controller_.get());
+}
+
+bool AcceleratorManagerImpl::IsReservedAccelerator(
+    const ui::Accelerator& accelerator) const {
+  std::map<ui::Accelerator, InternalData>::const_iterator iter =
+      accelerators_.find(accelerator);
+  if (iter == accelerators_.end())
+    return false;
+  return iter->second.IsReserved();
+}
+
+bool AcceleratorManagerImpl::ProcessAccelerator(
+    const ui::Accelerator& accelerator) {
+  return accelerator_manager_->Process(accelerator);
+}
+
+void AcceleratorManagerImpl::RegisterAccelerators(
+    const AcceleratorData accelerators[],
+    size_t num_accelerators,
+    AcceleratorHandler* handler) {
+  for (size_t i = 0; i < num_accelerators; ++i)
+    RegisterAccelerator(accelerators[i], handler);
+}
+
+void AcceleratorManagerImpl::EnableDebugAccelerators() {
+  debug_accelerators_enabled_ = true;
+}
+
+bool AcceleratorManagerImpl::AcceleratorPressed(
+    const ui::Accelerator& accelerator) {
+  std::map<ui::Accelerator, InternalData>::iterator iter =
+      accelerators_.find(accelerator);
+  DCHECK(iter != accelerators_.end());
+  if (iter == accelerators_.end())
+    return false;
+  InternalData& data = iter->second;
+  if (data.IsDebug() && !debug_accelerators_enabled_)
+    return false;
+  if (accelerator.IsRepeat() && data.IsNonAutoRepeatable())
+    return false;
+  return data.IsCommandEnabled() ? data.OnAcceleratorFired(accelerator) : false;
+}
+
+bool AcceleratorManagerImpl::CanHandleAccelerators() const {
+  return true;
+}
+
+void AcceleratorManagerImpl::RegisterAccelerator(
+    const AcceleratorData& accelerator_data,
+    AcceleratorHandler* handler) {
+  ui::Accelerator accelerator(accelerator_data.keycode,
+                              accelerator_data.keyevent_flags);
+  accelerator.set_type(accelerator_data.trigger_event == TRIGGER_ON_PRESS
+                           ? ui::ET_KEY_PRESSED
+                           : ui::ET_KEY_RELEASED);
+  accelerator_manager_->Register(
+      accelerator, ui::AcceleratorManager::kNormalPriority, this);
+  accelerators_.insert(
+      std::make_pair(accelerator,
+                     InternalData(accelerator_data.command_id,
+                                  handler,
+                                  accelerator_data.accelerator_flags)));
+}
+
+}  // namespace athena