src/remoting/host/input_injector_win.cc

   1 // Copyright (c) 2012 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 "remoting/host/input_injector.h"
   6
   7 #include <windows.h>
   8
   9 #include "base/bind.h"
  10 #include "base/compiler_specific.h"
  11 #include "base/location.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "base/single_thread_task_runner.h"
  14 #include "base/strings/string16.h"
  15 #include "base/strings/utf_string_conversions.h"
  16 #include "remoting/base/util.h"
  17 #include "remoting/host/clipboard.h"
  18 #include "remoting/proto/event.pb.h"
  19 #include "ui/events/keycodes/dom4/keycode_converter.h"
  20
  21 namespace remoting {
  22
  23 namespace {
  24
  25 // Helper used to call SendInput() API.
  26 void SendKeyboardInput(uint32_t flags, uint16_t scancode) {
  27   // Populate a Windows INPUT structure for the event.
  28   INPUT input;
  29   memset(&input, 0, sizeof(input));
  30   input.type = INPUT_KEYBOARD;
  31   input.ki.time = 0;
  32   input.ki.dwFlags = flags;
  33   input.ki.wScan = scancode;
  34
  35   if ((flags & KEYEVENTF_UNICODE) == 0) {
  36     // Windows scancodes are only 8-bit, so store the low-order byte into the
  37     // event and set the extended flag if any high-order bits are set. The only
  38     // high-order values we should see are 0xE0 or 0xE1. The extended bit
  39     // usually distinguishes keys with the same meaning, e.g. left & right
  40     // shift.
  41     input.ki.wScan &= 0xFF;
  42     if ((scancode & 0xFF00) != 0x0000)
  43       input.ki.dwFlags |= KEYEVENTF_EXTENDEDKEY;
  44   }
  45
  46   if (SendInput(1, &input, sizeof(INPUT)) == 0)
  47     PLOG(ERROR) << "Failed to inject a key event";
  48 }
  49
  50 using protocol::ClipboardEvent;
  51 using protocol::KeyEvent;
  52 using protocol::TextEvent;
  53 using protocol::MouseEvent;
  54
  55 // A class to generate events on Windows.
  56 class InputInjectorWin : public InputInjector {
  57  public:
  58   InputInjectorWin(scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
  59                    scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
  60   virtual ~InputInjectorWin();
  61
  62   // ClipboardStub interface.
  63   virtual void InjectClipboardEvent(const ClipboardEvent& event) OVERRIDE;
  64
  65   // InputStub interface.
  66   virtual void InjectKeyEvent(const KeyEvent& event) OVERRIDE;
  67   virtual void InjectTextEvent(const TextEvent& event) OVERRIDE;
  68   virtual void InjectMouseEvent(const MouseEvent& event) OVERRIDE;
  69
  70   // InputInjector interface.
  71   virtual void Start(
  72       scoped_ptr<protocol::ClipboardStub> client_clipboard) OVERRIDE;
  73
  74  private:
  75   // The actual implementation resides in InputInjectorWin::Core class.
  76   class Core : public base::RefCountedThreadSafe<Core> {
  77    public:
  78     Core(scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
  79          scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
  80
  81     // Mirrors the ClipboardStub interface.
  82     void InjectClipboardEvent(const ClipboardEvent& event);
  83
  84     // Mirrors the InputStub interface.
  85     void InjectKeyEvent(const KeyEvent& event);
  86     void InjectTextEvent(const TextEvent& event);
  87     void InjectMouseEvent(const MouseEvent& event);
  88
  89     // Mirrors the InputInjector interface.
  90     void Start(scoped_ptr<protocol::ClipboardStub> client_clipboard);
  91
  92     void Stop();
  93
  94    private:
  95     friend class base::RefCountedThreadSafe<Core>;
  96     virtual ~Core();
  97
  98     void HandleKey(const KeyEvent& event);
  99     void HandleText(const TextEvent& event);
 100     void HandleMouse(const MouseEvent& event);
 101
 102     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
 103     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
 104     scoped_ptr<Clipboard> clipboard_;
 105
 106     DISALLOW_COPY_AND_ASSIGN(Core);
 107   };
 108
 109   scoped_refptr<Core> core_;
 110
 111   DISALLOW_COPY_AND_ASSIGN(InputInjectorWin);
 112 };
 113
 114 InputInjectorWin::InputInjectorWin(
 115     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
 116     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
 117   core_ = new Core(main_task_runner, ui_task_runner);
 118 }
 119
 120 InputInjectorWin::~InputInjectorWin() {
 121   core_->Stop();
 122 }
 123
 124 void InputInjectorWin::InjectClipboardEvent(const ClipboardEvent& event) {
 125   core_->InjectClipboardEvent(event);
 126 }
 127
 128 void InputInjectorWin::InjectKeyEvent(const KeyEvent& event) {
 129   core_->InjectKeyEvent(event);
 130 }
 131
 132 void InputInjectorWin::InjectTextEvent(const TextEvent& event) {
 133   core_->InjectTextEvent(event);
 134 }
 135
 136 void InputInjectorWin::InjectMouseEvent(const MouseEvent& event) {
 137   core_->InjectMouseEvent(event);
 138 }
 139
 140 void InputInjectorWin::Start(
 141     scoped_ptr<protocol::ClipboardStub> client_clipboard) {
 142   core_->Start(client_clipboard.Pass());
 143 }
 144
 145 InputInjectorWin::Core::Core(
 146     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
 147     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner)
 148     : main_task_runner_(main_task_runner),
 149       ui_task_runner_(ui_task_runner),
 150       clipboard_(Clipboard::Create()) {
 151 }
 152
 153 void InputInjectorWin::Core::InjectClipboardEvent(const ClipboardEvent& event) {
 154   if (!ui_task_runner_->BelongsToCurrentThread()) {
 155     ui_task_runner_->PostTask(
 156         FROM_HERE, base::Bind(&Core::InjectClipboardEvent, this, event));
 157     return;
 158   }
 159
 160   // |clipboard_| will ignore unknown MIME-types, and verify the data's format.
 161   clipboard_->InjectClipboardEvent(event);
 162 }
 163
 164 void InputInjectorWin::Core::InjectKeyEvent(const KeyEvent& event) {
 165   if (!main_task_runner_->BelongsToCurrentThread()) {
 166     main_task_runner_->PostTask(FROM_HERE,
 167                                 base::Bind(&Core::InjectKeyEvent, this, event));
 168     return;
 169   }
 170
 171   HandleKey(event);
 172 }
 173
 174 void InputInjectorWin::Core::InjectTextEvent(const TextEvent& event) {
 175   if (!main_task_runner_->BelongsToCurrentThread()) {
 176     main_task_runner_->PostTask(
 177         FROM_HERE, base::Bind(&Core::InjectTextEvent, this, event));
 178     return;
 179   }
 180
 181   HandleText(event);
 182 }
 183
 184 void InputInjectorWin::Core::InjectMouseEvent(const MouseEvent& event) {
 185   if (!main_task_runner_->BelongsToCurrentThread()) {
 186     main_task_runner_->PostTask(
 187         FROM_HERE, base::Bind(&Core::InjectMouseEvent, this, event));
 188     return;
 189   }
 190
 191   HandleMouse(event);
 192 }
 193
 194 void InputInjectorWin::Core::Start(
 195     scoped_ptr<protocol::ClipboardStub> client_clipboard) {
 196   if (!ui_task_runner_->BelongsToCurrentThread()) {
 197     ui_task_runner_->PostTask(
 198         FROM_HERE,
 199         base::Bind(&Core::Start, this, base::Passed(&client_clipboard)));
 200     return;
 201   }
 202
 203   clipboard_->Start(client_clipboard.Pass());
 204 }
 205
 206 void InputInjectorWin::Core::Stop() {
 207   if (!ui_task_runner_->BelongsToCurrentThread()) {
 208     ui_task_runner_->PostTask(FROM_HERE, base::Bind(&Core::Stop, this));
 209     return;
 210   }
 211
 212   clipboard_->Stop();
 213 }
 214
 215 InputInjectorWin::Core::~Core() {}
 216
 217 void InputInjectorWin::Core::HandleKey(const KeyEvent& event) {
 218   // HostEventDispatcher should filter events missing the pressed field.
 219   DCHECK(event.has_pressed() && event.has_usb_keycode());
 220
 221   // Reset the system idle suspend timeout.
 222   SetThreadExecutionState(ES_SYSTEM_REQUIRED);
 223
 224   int scancode =
 225       ui::KeycodeConverter::UsbKeycodeToNativeKeycode(event.usb_keycode());
 226   VLOG(3) << "Converting USB keycode: " << std::hex << event.usb_keycode()
 227           << " to scancode: " << scancode << std::dec;
 228
 229   // Ignore events which can't be mapped.
 230   if (scancode == ui::KeycodeConverter::InvalidNativeKeycode())
 231     return;
 232
 233   uint32_t flags = KEYEVENTF_SCANCODE | (event.pressed() ? 0 : KEYEVENTF_KEYUP);
 234   SendKeyboardInput(flags, scancode);
 235 }
 236
 237 void InputInjectorWin::Core::HandleText(const TextEvent& event) {
 238   // HostEventDispatcher should filter events missing the pressed field.
 239   DCHECK(event.has_text());
 240
 241   base::string16 text = base::UTF8ToUTF16(event.text());
 242   for (base::string16::const_iterator it = text.begin();
 243        it != text.end(); ++it)  {
 244     SendKeyboardInput(KEYEVENTF_UNICODE, *it);
 245     SendKeyboardInput(KEYEVENTF_UNICODE | KEYEVENTF_KEYUP, *it);
 246   }
 247 }
 248
 249 void InputInjectorWin::Core::HandleMouse(const MouseEvent& event) {
 250   // Reset the system idle suspend timeout.
 251   SetThreadExecutionState(ES_SYSTEM_REQUIRED);
 252
 253   INPUT input;
 254   memset(&input, 0, sizeof(input));
 255   input.type = INPUT_MOUSE;
 256
 257   if (event.has_delta_x() && event.has_delta_y()) {
 258     input.mi.dx = event.delta_x();
 259     input.mi.dy = event.delta_y();
 260     input.mi.dwFlags |= MOUSEEVENTF_MOVE | MOUSEEVENTF_VIRTUALDESK;
 261   } else if (event.has_x() && event.has_y()) {
 262     int width = GetSystemMetrics(SM_CXVIRTUALSCREEN);
 263     int height = GetSystemMetrics(SM_CYVIRTUALSCREEN);
 264     if (width > 1 && height > 1) {
 265       int x = std::max(0, std::min(width, event.x()));
 266       int y = std::max(0, std::min(height, event.y()));
 267       input.mi.dx = static_cast<int>((x * 65535) / (width - 1));
 268       input.mi.dy = static_cast<int>((y * 65535) / (height - 1));
 269       input.mi.dwFlags |=
 270           MOUSEEVENTF_MOVE | MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_VIRTUALDESK;
 271     }
 272   }
 273
 274   int wheel_delta_x = 0;
 275   int wheel_delta_y = 0;
 276   if (event.has_wheel_delta_x() && event.has_wheel_delta_y()) {
 277     wheel_delta_x = static_cast<int>(event.wheel_delta_x());
 278     wheel_delta_y = static_cast<int>(event.wheel_delta_y());
 279   }
 280
 281   if (wheel_delta_x != 0 || wheel_delta_y != 0) {
 282     if (wheel_delta_x != 0) {
 283       input.mi.mouseData = wheel_delta_x;
 284       input.mi.dwFlags |= MOUSEEVENTF_HWHEEL;
 285     }
 286     if (wheel_delta_y != 0) {
 287       input.mi.mouseData = wheel_delta_y;
 288       input.mi.dwFlags |= MOUSEEVENTF_WHEEL;
 289     }
 290   }
 291
 292   if (event.has_button() && event.has_button_down()) {
 293     MouseEvent::MouseButton button = event.button();
 294     bool down = event.button_down();
 295
 296     // If the host is configured to swap left & right buttons, inject swapped
 297     // events to un-do that re-mapping.
 298     if (GetSystemMetrics(SM_SWAPBUTTON)) {
 299       if (button == MouseEvent::BUTTON_LEFT) {
 300         button = MouseEvent::BUTTON_RIGHT;
 301       } else if (button == MouseEvent::BUTTON_RIGHT) {
 302         button = MouseEvent::BUTTON_LEFT;
 303       }
 304     }
 305
 306     if (button == MouseEvent::BUTTON_LEFT) {
 307       input.mi.dwFlags |= down ? MOUSEEVENTF_LEFTDOWN : MOUSEEVENTF_LEFTUP;
 308     } else if (button == MouseEvent::BUTTON_MIDDLE) {
 309       input.mi.dwFlags |= down ? MOUSEEVENTF_MIDDLEDOWN : MOUSEEVENTF_MIDDLEUP;
 310     } else if (button == MouseEvent::BUTTON_RIGHT) {
 311       input.mi.dwFlags |= down ? MOUSEEVENTF_RIGHTDOWN : MOUSEEVENTF_RIGHTUP;
 312     } else {
 313       input.mi.dwFlags |= down ? MOUSEEVENTF_LEFTDOWN : MOUSEEVENTF_LEFTUP;
 314     }
 315   }
 316
 317   if (input.mi.dwFlags) {
 318     if (SendInput(1, &input, sizeof(INPUT)) == 0)
 319       PLOG(ERROR) << "Failed to inject a mouse event";
 320   }
 321 }
 322
 323 }  // namespace
 324
 325 scoped_ptr<InputInjector> InputInjector::Create(
 326     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
 327     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
 328   return scoped_ptr<InputInjector>(
 329       new InputInjectorWin(main_task_runner, ui_task_runner));
 330 }
 331
 332 }  // namespace remoting