Track the active ExtensionKeybindingRegistry and make it available to EventRewriter.

chrome/browser/chromeos/events/event_rewriter.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 "chrome/browser/chromeos/events/event_rewriter.h"
 
 #include <vector>
 
 #include "ash/sticky_keys/sticky_keys_controller.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_util.h"
 #include "base/sys_info.h"
 #include "chrome/browser/chromeos/login/ui/login_display_host_impl.h"
 #include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_window.h"
 #include "chrome/common/pref_names.h"
 #include "chromeos/chromeos_switches.h"
 #include "chromeos/ime/ime_keyboard.h"
 #include "chromeos/ime/input_method_manager.h"
 #include "components/user_manager/user_manager.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/keycodes/keyboard_code_conversion.h"
 #include "ui/wm/core/window_util.h"
 
@@ skipping 67 matching lines @@
 bool IsISOLevel5ShiftUsedByCurrentInputMethod() {
   // Since both German Neo2 XKB layout and Caps Lock depend on Mod3Mask,
   // it's not possible to make both features work. For now, we don't remap
   // Mod3Mask when Neo2 is in use.
   // TODO(yusukes): Remove the restriction.
   input_method::InputMethodManager* manager =
       input_method::InputMethodManager::Get();
   return manager->IsISOLevel5ShiftUsedByCurrentInputMethod();
 }
 
+bool IsExtensionCommandRegistered(const ui::KeyEvent& key_event) {
+  // Some keyboard events for ChromeOS get rewritten, such as:
+  // Search+Shift+Left gets converted to Shift+Home (BeginDocument).
+  // This doesn't make sense if the user has assigned that shortcut
+  // to an extension. Because:
+  // 1) The extension would, upon seeing a request for Ctrl+Shift+Home have
+  //    to register for Shift+Home, instead.
+  // 2) The conversion is unnecessary, because Shift+Home (BeginDocument) isn't
+  //    going to be executed.
+  // Therefore, we skip converting the accelerator if an extension has
+  // registered for this shortcut.
+  const BrowserList* ash_browser_list =
+      BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
+  for (BrowserList::const_reverse_iterator browser_iterator =
+           ash_browser_list->begin_last_active();
+       browser_iterator != ash_browser_list->end_last_active();
+       ++browser_iterator) {
+    BrowserWindow* window = (*browser_iterator)->window();
+
+    if (window->IsActive()) {
+      int modifiers = ui::EF_NONE;
+      if (key_event.IsShiftDown())
+        modifiers |= ui::EF_SHIFT_DOWN;
+      if (key_event.IsControlDown())
+        modifiers |= ui::EF_CONTROL_DOWN;
+      if (key_event.IsAltDown())
+        modifiers |= ui::EF_ALT_DOWN;
+      if (key_event.IsCommandDown())
+        modifiers |= ui::EF_COMMAND_DOWN;
+      ui::Accelerator accelerator(key_event.key_code(), modifiers);
+      if (window->IsExtensionCommandRegistered(accelerator))
+        return true;
+    }
+  }
+  return false;
+}
+
 EventRewriter::DeviceType GetDeviceType(const std::string& device_name) {
   std::vector<std::string> tokens;
   Tokenize(device_name, " .", &tokens);
 
   // If the |device_name| contains the two words, "apple" and "keyboard", treat
   // it as an Apple keyboard.
   bool found_apple = false;
   bool found_keyboard = false;
   for (size_t i = 0; i < tokens.size(); ++i) {
     if (!found_apple && LowerCaseEqualsASCII(tokens[i], "apple"))
@@ skipping 236 matching lines @@
     remapped_state->key_code = map.output_key_code;
     remapped_state->flags = (input.flags & ~map.input_flags) | map.output_flags;
     return true;
   }
   return false;
 }
 
 ui::EventRewriteStatus EventRewriter::RewriteKeyEvent(
     const ui::KeyEvent& key_event,
     scoped_ptr<ui::Event>* rewritten_event) {
+  if (IsExtensionCommandRegistered(key_event))
+    return ui::EVENT_REWRITE_CONTINUE;
   if (key_event.source_device_id() != ui::ED_UNKNOWN_DEVICE)
     DeviceKeyPressedOrReleased(key_event.source_device_id());
   MutableKeyState state = {key_event.flags(), key_event.key_code()};
   // Do not rewrite an event sent by ui_controls::SendKeyPress(). See
   // crbug.com/136465.
   if (!(key_event.flags() & ui::EF_FINAL)) {
     RewriteModifierKeys(key_event, &state);
     RewriteNumPadKeys(key_event, &state);
   }
   ui::EventRewriteStatus status = ui::EVENT_REWRITE_CONTINUE;
@@ skipping 488 matching lines @@
     KeyboardDeviceAddedInternal(device_info[i].deviceid, device_info[i].name);
   }
 
   XIFreeDeviceInfo(device_info);
 #else
   KeyboardDeviceAddedInternal(device_id, "keyboard");
 #endif
 }
 
 }  // namespace chromeos