Automatically remap Command key on an Apple keyboard to Control [part 1 of 2 - Ash part]

ash/shell.cc

 // Copyright (c) 2012 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 "ash/shell.h"
 
 #include <algorithm>
 
 #include "ash/app_list/app_list.h"
 #include "ash/ash_switches.h"
@@ skipping 25 matching lines @@
 #include "ash/system/tray/tray_empty.h"
 #include "ash/system/tray_accessibility.h"
 #include "ash/system/tray_caps_lock.h"
 #include "ash/system/user/tray_user.h"
 #include "ash/tooltips/tooltip_controller.h"
 #include "ash/wm/activation_controller.h"
 #include "ash/wm/base_layout_manager.h"
 #include "ash/wm/custom_frame_view_ash.h"
 #include "ash/wm/dialog_frame_view.h"
 #include "ash/wm/event_client_impl.h"
+#include "ash/wm/key_rewriter_event_filter.h"
 #include "ash/wm/panel_window_event_filter.h"
 #include "ash/wm/panel_layout_manager.h"
 #include "ash/wm/partial_screenshot_event_filter.h"
 #include "ash/wm/power_button_controller.h"
 #include "ash/wm/resize_shadow_controller.h"
 #include "ash/wm/root_window_event_filter.h"
 #include "ash/wm/root_window_layout_manager.h"
 #include "ash/wm/shadow_controller.h"
 #include "ash/wm/shelf_layout_manager.h"
 #include "ash/wm/stacking_controller.h"
@@ skipping 460 matching lines @@
       root_filter_(NULL),
       delegate_(delegate),
       shelf_(NULL),
       root_window_layout_(NULL),
       status_widget_(NULL) {
   gfx::Screen::SetInstance(screen_);
   ui_controls::InstallUIControlsAura(CreateUIControlsAura(root_window_.get()));
 }
 
 Shell::~Shell() {
+  RemoveRootWindowEventFilter(key_rewriter_filter_.get());
   RemoveRootWindowEventFilter(partial_screenshot_filter_.get());
   RemoveRootWindowEventFilter(input_method_filter_.get());
   RemoveRootWindowEventFilter(window_modality_controller_.get());
 #if !defined(OS_MACOSX)
   RemoveRootWindowEventFilter(accelerator_filter_.get());
 #endif
 
   // Close background widget now so that the focus manager of the
   // widget gets deleted in the final message loop run.
   root_window_layout_->SetBackgroundWidget(NULL);
@@ skipping 77 matching lines @@
 void Shell::Init() {
   aura::RootWindow* root_window = GetRootWindow();
   root_filter_ = new internal::RootWindowEventFilter(root_window);
 #if !defined(OS_MACOSX)
   nested_dispatcher_controller_.reset(new NestedDispatcherController);
   accelerator_controller_.reset(new AcceleratorController);
 #endif
   // Pass ownership of the filter to the root window.
   GetRootWindow()->SetEventFilter(root_filter_);
 
+  // KeyRewriterEventFilter must be the first one.
   DCHECK(!GetRootWindowEventFilterCount());
+  key_rewriter_filter_.reset(new internal::KeyRewriterEventFilter);
+  AddRootWindowEventFilter(key_rewriter_filter_.get());
 
-  // PartialScreenshotEventFilter must be the first one to capture key
+  // PartialScreenshotEventFilter must be the second one to capture key
   // events when the taking partial screenshot UI is there.
+  DCHECK_EQ(1U, GetRootWindowEventFilterCount());
   partial_screenshot_filter_.reset(new internal::PartialScreenshotEventFilter);
   AddRootWindowEventFilter(partial_screenshot_filter_.get());
 
   // Then AcceleratorFilter and InputMethodEventFilter must be added (in this
   // order) since they have the second highest priority.
-  DCHECK_EQ(1U, GetRootWindowEventFilterCount());
+  DCHECK_EQ(2U, GetRootWindowEventFilterCount());
 #if !defined(OS_MACOSX)
   accelerator_filter_.reset(new internal::AcceleratorFilter);
   AddRootWindowEventFilter(accelerator_filter_.get());
-  DCHECK_EQ(2U, GetRootWindowEventFilterCount());
+  DCHECK_EQ(3U, GetRootWindowEventFilterCount());
 #endif
   input_method_filter_.reset(new internal::InputMethodEventFilter);
   AddRootWindowEventFilter(input_method_filter_.get());
 
   root_window->SetCursor(aura::kCursorPointer);
   if (initially_hide_cursor_)
     root_window->ShowCursor(false);
 
   activation_controller_.reset(new internal::ActivationController);
 
@@ skipping 259 matching lines @@
   desktop_background_controller_->SetDesktopBackgroundImageMode(
       GetWallpaper(index), GetWallpaperInfo(index).layout);
 }
 
 void Shell::DisableWorkspaceGridLayout() {
   if (workspace_controller_.get())
     workspace_controller_->workspace_manager()->set_grid_size(0);
 }
 
 }  // namespace ash