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      1 // Copyright (c) 2011 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/extension_input_api.h"
      6 
      7 #include <string>
      8 
      9 #include "base/string_util.h"
     10 #include "base/values.h"
     11 #include "chrome/browser/extensions/extension_tabs_module.h"
     12 #include "chrome/browser/extensions/key_identifier_conversion_views.h"
     13 #include "chrome/browser/ui/browser.h"
     14 #include "chrome/browser/ui/browser_window.h"
     15 #include "chrome/browser/ui/views/frame/browser_view.h"
     16 #include "content/browser/renderer_host/render_view_host.h"
     17 #include "content/common/native_web_keyboard_event.h"
     18 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
     19 #include "views/events/event.h"
     20 #include "views/ime/input_method.h"
     21 #include "views/widget/root_view.h"
     22 #include "views/widget/widget.h"
     23 
     24 namespace {
     25 
     26 // Keys.
     27 const char kType[] = "type";
     28 const char kKeyIdentifier[] = "keyIdentifier";
     29 const char kAlt[] = "altKey";
     30 const char kCtrl[] = "ctrlKey";
     31 const char kMeta[] = "metaKey";
     32 const char kShift[] = "shiftKey";
     33 const char kKeyDown[] = "keydown";
     34 const char kKeyUp[] = "keyup";
     35 
     36 // Errors.
     37 const char kUnknownEventTypeError[] = "Unknown event type.";
     38 const char kUnknownOrUnsupportedKeyIdentiferError[] = "Unknown or unsupported "
     39     "key identifier.";
     40 const char kUnsupportedModifier[] = "Unsupported modifier.";
     41 const char kNoValidRecipientError[] = "No valid recipient for event.";
     42 const char kKeyEventUnprocessedError[] = "Event was not handled.";
     43 
     44 ui::EventType GetTypeFromString(const std::string& type) {
     45   if (type == kKeyDown) {
     46     return ui::ET_KEY_PRESSED;
     47   } else if (type == kKeyUp) {
     48     return ui::ET_KEY_RELEASED;
     49   }
     50   return ui::ET_UNKNOWN;
     51 }
     52 
     53 }  // namespace
     54 
     55 void InputFunction::Run() {
     56   SendResponse(RunImpl());
     57 }
     58 
     59 views::RootView* SendKeyboardEventInputFunction::GetRootView() {
     60   Browser* browser = GetCurrentBrowser();
     61   if (!browser)
     62     return NULL;
     63 
     64   BrowserWindow* window = browser->window();
     65   if (!window)
     66     return NULL;
     67 
     68   BrowserView* browser_view = BrowserView::GetBrowserViewForNativeWindow(
     69       window->GetNativeHandle());
     70   if (!browser_view)
     71     return NULL;
     72 
     73   return browser_view->GetRootView();
     74 }
     75 
     76 bool SendKeyboardEventInputFunction::RunImpl() {
     77   DictionaryValue* args;
     78   EXTENSION_FUNCTION_VALIDATE(args_->GetDictionary(0, &args));
     79 
     80   std::string type_name;
     81   EXTENSION_FUNCTION_VALIDATE(args->GetString(kType, &type_name));
     82   ui::EventType type = GetTypeFromString(type_name);
     83   if (type == ui::ET_UNKNOWN) {
     84     error_ = kUnknownEventTypeError;
     85     return false;
     86   }
     87 
     88   std::string identifier;
     89   EXTENSION_FUNCTION_VALIDATE(args->GetString(kKeyIdentifier, &identifier));
     90   TrimWhitespaceASCII(identifier, TRIM_ALL, &identifier);
     91 
     92   const views::KeyEvent& prototype_event =
     93       KeyEventFromKeyIdentifier(identifier);
     94   if (prototype_event.key_code() == ui::VKEY_UNKNOWN) {
     95     error_ = kUnknownOrUnsupportedKeyIdentiferError;
     96     return false;
     97   }
     98 
     99   int flags = prototype_event.flags();
    100   bool alt = false;
    101   if (args->GetBoolean(kAlt, &alt))
    102     flags |= alt ? ui::EF_ALT_DOWN : 0;
    103   bool ctrl = false;
    104   if (args->GetBoolean(kCtrl, &ctrl))
    105     flags |= ctrl ? ui::EF_CONTROL_DOWN : 0;
    106   bool shift = false;
    107   if (args->GetBoolean(kShift, &shift))
    108     flags |= shift ? ui::EF_SHIFT_DOWN : 0;
    109   bool meta = false;
    110   if (args->GetBoolean(kMeta, &meta)) {
    111     // Views does not have a Meta event flag, so return an error for now.
    112     if (meta) {
    113       error_ = kUnsupportedModifier;
    114       return false;
    115     }
    116   }
    117 
    118   views::RootView* root_view = GetRootView();
    119   if (!root_view) {
    120     error_ = kNoValidRecipientError;
    121     return false;
    122   }
    123 
    124   views::KeyEvent event(type, prototype_event.key_code(), flags);
    125   views::InputMethod* ime = root_view->GetWidget()->GetInputMethod();
    126   if (ime) {
    127     ime->DispatchKeyEvent(event);
    128   } else if (!root_view->ProcessKeyEvent(event)) {
    129     error_ = kKeyEventUnprocessedError;
    130     return false;
    131   }
    132 
    133   return true;
    134 }
    135