remoting/host/input_injector_mac.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 <ApplicationServices/ApplicationServices.h>
   8 #include <Carbon/Carbon.h>
   9 #include <algorithm>
  10
  11 #include "base/basictypes.h"
  12 #include "base/bind.h"
  13 #include "base/compiler_specific.h"
  14 #include "base/location.h"
  15 #include "base/mac/scoped_cftyperef.h"
  16 #include "base/memory/ref_counted.h"
  17 #include "base/single_thread_task_runner.h"
  18 #include "base/strings/utf_string_conversions.h"
  19 #include "remoting/host/clipboard.h"
  20 #include "remoting/proto/internal.pb.h"
  21 #include "remoting/protocol/message_decoder.h"
  22 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
  23 #include "third_party/webrtc/modules/desktop_capture/mac/desktop_configuration.h"
  24 #include "ui/events/keycodes/dom4/keycode_converter.h"
  25
  26 namespace remoting {
  27
  28 namespace {
  29
  30 void SetOrClearBit(uint64_t &value, uint64_t bit, bool set_bit) {
  31   value = set_bit ? (value | bit) : (value & ~bit);
  32 }
  33
  34 void CreateAndPostKeyEvent(int keycode,
  35                            bool pressed,
  36                            int flags,
  37                            const base::string16& unicode) {
  38   base::ScopedCFTypeRef<CGEventRef> eventRef(
  39       CGEventCreateKeyboardEvent(NULL, keycode, pressed));
  40   if (eventRef) {
  41     CGEventSetFlags(eventRef, flags);
  42     if (!unicode.empty())
  43       CGEventKeyboardSetUnicodeString(eventRef, unicode.size(), &(unicode[0]));
  44     CGEventPost(kCGSessionEventTap, eventRef);
  45   }
  46 }
  47
  48 // This value is not defined. Give it the obvious name so that if it is ever
  49 // added there will be a handy compilation error to remind us to remove this
  50 // definition.
  51 const int kVK_RightCommand = 0x36;
  52
  53 using protocol::ClipboardEvent;
  54 using protocol::KeyEvent;
  55 using protocol::TextEvent;
  56 using protocol::MouseEvent;
  57
  58 // A class to generate events on Mac.
  59 class InputInjectorMac : public InputInjector {
  60  public:
  61   explicit InputInjectorMac(
  62       scoped_refptr<base::SingleThreadTaskRunner> task_runner);
  63   virtual ~InputInjectorMac();
  64
  65   // ClipboardStub interface.
  66   virtual void InjectClipboardEvent(const ClipboardEvent& event) OVERRIDE;
  67
  68   // InputStub interface.
  69   virtual void InjectKeyEvent(const KeyEvent& event) OVERRIDE;
  70   virtual void InjectTextEvent(const TextEvent& event) OVERRIDE;
  71   virtual void InjectMouseEvent(const MouseEvent& event) OVERRIDE;
  72
  73   // InputInjector interface.
  74   virtual void Start(
  75       scoped_ptr<protocol::ClipboardStub> client_clipboard) OVERRIDE;
  76
  77  private:
  78   // The actual implementation resides in InputInjectorMac::Core class.
  79   class Core : public base::RefCountedThreadSafe<Core> {
  80    public:
  81     explicit Core(scoped_refptr<base::SingleThreadTaskRunner> task_runner);
  82
  83     // Mirrors the ClipboardStub interface.
  84     void InjectClipboardEvent(const ClipboardEvent& event);
  85
  86     // Mirrors the InputStub interface.
  87     void InjectKeyEvent(const KeyEvent& event);
  88     void InjectTextEvent(const TextEvent& event);
  89     void InjectMouseEvent(const MouseEvent& event);
  90
  91     // Mirrors the InputInjector interface.
  92     void Start(scoped_ptr<protocol::ClipboardStub> client_clipboard);
  93
  94     void Stop();
  95
  96    private:
  97     friend class base::RefCountedThreadSafe<Core>;
  98     virtual ~Core();
  99
 100     scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 101     webrtc::DesktopVector mouse_pos_;
 102     uint32 mouse_button_state_;
 103     scoped_ptr<Clipboard> clipboard_;
 104     CGEventFlags left_modifiers_;
 105     CGEventFlags right_modifiers_;
 106
 107     DISALLOW_COPY_AND_ASSIGN(Core);
 108   };
 109
 110   scoped_refptr<Core> core_;
 111
 112   DISALLOW_COPY_AND_ASSIGN(InputInjectorMac);
 113 };
 114
 115 InputInjectorMac::InputInjectorMac(
 116     scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
 117   core_ = new Core(task_runner);
 118 }
 119
 120 InputInjectorMac::~InputInjectorMac() {
 121   core_->Stop();
 122 }
 123
 124 void InputInjectorMac::InjectClipboardEvent(const ClipboardEvent& event) {
 125   core_->InjectClipboardEvent(event);
 126 }
 127
 128 void InputInjectorMac::InjectKeyEvent(const KeyEvent& event) {
 129   core_->InjectKeyEvent(event);
 130 }
 131
 132 void InputInjectorMac::InjectTextEvent(const TextEvent& event) {
 133   core_->InjectTextEvent(event);
 134 }
 135
 136 void InputInjectorMac::InjectMouseEvent(const MouseEvent& event) {
 137   core_->InjectMouseEvent(event);
 138 }
 139
 140 void InputInjectorMac::Start(
 141     scoped_ptr<protocol::ClipboardStub> client_clipboard) {
 142   core_->Start(client_clipboard.Pass());
 143 }
 144
 145 InputInjectorMac::Core::Core(
 146     scoped_refptr<base::SingleThreadTaskRunner> task_runner)
 147     : task_runner_(task_runner),
 148       mouse_button_state_(0),
 149       clipboard_(Clipboard::Create()),
 150       left_modifiers_(0),
 151       right_modifiers_(0) {
 152   // Ensure that local hardware events are not suppressed after injecting
 153   // input events.  This allows LocalInputMonitor to detect if the local mouse
 154   // is being moved whilst a remote user is connected.
 155   // This API is deprecated, but it is needed when using the deprecated
 156   // injection APIs.
 157   // If the non-deprecated injection APIs were used instead, the equivalent of
 158   // this line would not be needed, as OS X defaults to _not_ suppressing local
 159   // inputs in that case.
 160 #pragma clang diagnostic push
 161 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
 162   CGSetLocalEventsSuppressionInterval(0.0);
 163 #pragma clang diagnostic pop
 164 }
 165
 166 void InputInjectorMac::Core::InjectClipboardEvent(const ClipboardEvent& event) {
 167   if (!task_runner_->BelongsToCurrentThread()) {
 168     task_runner_->PostTask(
 169         FROM_HERE, base::Bind(&Core::InjectClipboardEvent, this, event));
 170     return;
 171   }
 172
 173   // |clipboard_| will ignore unknown MIME-types, and verify the data's format.
 174   clipboard_->InjectClipboardEvent(event);
 175 }
 176
 177 void InputInjectorMac::Core::InjectKeyEvent(const KeyEvent& event) {
 178   // HostEventDispatcher should filter events missing the pressed field.
 179   if (!event.has_pressed() || !event.has_usb_keycode())
 180     return;
 181
 182   int keycode =
 183       ui::KeycodeConverter::UsbKeycodeToNativeKeycode(event.usb_keycode());
 184
 185   VLOG(3) << "Converting USB keycode: " << std::hex << event.usb_keycode()
 186           << " to keycode: " << keycode << std::dec;
 187
 188   // If we couldn't determine the Mac virtual key code then ignore the event.
 189   if (keycode == ui::KeycodeConverter::InvalidNativeKeycode())
 190     return;
 191
 192   // If this is a modifier key, remember its new state so that it can be
 193   // correctly applied to subsequent events.
 194   if (keycode == kVK_Command) {
 195     SetOrClearBit(left_modifiers_, kCGEventFlagMaskCommand, event.pressed());
 196   } else if (keycode == kVK_Shift) {
 197     SetOrClearBit(left_modifiers_, kCGEventFlagMaskShift, event.pressed());
 198   } else if (keycode == kVK_Control) {
 199     SetOrClearBit(left_modifiers_, kCGEventFlagMaskControl, event.pressed());
 200   } else if (keycode == kVK_Option) {
 201     SetOrClearBit(left_modifiers_, kCGEventFlagMaskAlternate, event.pressed());
 202   } else if (keycode == kVK_RightCommand) {
 203     SetOrClearBit(right_modifiers_, kCGEventFlagMaskCommand, event.pressed());
 204   } else if (keycode == kVK_RightShift) {
 205     SetOrClearBit(right_modifiers_, kCGEventFlagMaskShift, event.pressed());
 206   } else if (keycode == kVK_RightControl) {
 207     SetOrClearBit(right_modifiers_, kCGEventFlagMaskControl, event.pressed());
 208   } else if (keycode == kVK_RightOption) {
 209     SetOrClearBit(right_modifiers_, kCGEventFlagMaskAlternate, event.pressed());
 210   }
 211
 212   // In addition to the modifier keys pressed right now, we also need to set
 213   // AlphaShift if caps lock was active at the client (Mac ignores NumLock).
 214   uint64_t flags = left_modifiers_ | right_modifiers_;
 215   if (event.lock_states() & protocol::KeyEvent::LOCK_STATES_CAPSLOCK)
 216     flags |= kCGEventFlagMaskAlphaShift;
 217
 218   CreateAndPostKeyEvent(keycode, event.pressed(), flags, base::string16());
 219 }
 220
 221 void InputInjectorMac::Core::InjectTextEvent(const TextEvent& event) {
 222   DCHECK(event.has_text());
 223   base::string16 text = base::UTF8ToUTF16(event.text());
 224
 225   // Applications that ignore UnicodeString field will see the text event as
 226   // Space key.
 227   CreateAndPostKeyEvent(kVK_Space, true, 0, text);
 228   CreateAndPostKeyEvent(kVK_Space, false, 0, text);
 229 }
 230
 231 void InputInjectorMac::Core::InjectMouseEvent(const MouseEvent& event) {
 232   if (event.has_x() && event.has_y()) {
 233     // On multi-monitor systems (0,0) refers to the top-left of the "main"
 234     // display, whereas our coordinate scheme places (0,0) at the top-left of
 235     // the bounding rectangle around all the displays, so we need to translate
 236     // accordingly.
 237
 238     // Set the mouse position assuming single-monitor.
 239     mouse_pos_.set(event.x(), event.y());
 240
 241     // Fetch the desktop configuration.
 242     // TODO(wez): Optimize this out, or at least only enumerate displays in
 243     // response to display-changed events. VideoFrameCapturer's VideoFrames
 244     // could be augmented to include native cursor coordinates for use by
 245     // MouseClampingFilter, removing the need for translation here.
 246     webrtc::MacDesktopConfiguration desktop_config =
 247         webrtc::MacDesktopConfiguration::GetCurrent(
 248             webrtc::MacDesktopConfiguration::TopLeftOrigin);
 249
 250     // Translate the mouse position into desktop coordinates.
 251     mouse_pos_ = mouse_pos_.add(
 252         webrtc::DesktopVector(desktop_config.pixel_bounds.left(),
 253                               desktop_config.pixel_bounds.top()));
 254
 255     // Constrain the mouse position to the desktop coordinates.
 256     mouse_pos_.set(
 257        std::max(desktop_config.pixel_bounds.left(),
 258            std::min(desktop_config.pixel_bounds.right(), mouse_pos_.x())),
 259        std::max(desktop_config.pixel_bounds.top(),
 260            std::min(desktop_config.pixel_bounds.bottom(), mouse_pos_.y())));
 261
 262     // Convert from pixel to Density Independent Pixel coordinates.
 263     mouse_pos_.set(mouse_pos_.x() / desktop_config.dip_to_pixel_scale,
 264                    mouse_pos_.y() / desktop_config.dip_to_pixel_scale);
 265
 266     VLOG(3) << "Moving mouse to " << mouse_pos_.x() << "," << mouse_pos_.y();
 267   }
 268   if (event.has_button() && event.has_button_down()) {
 269     if (event.button() >= 1 && event.button() <= 3) {
 270       VLOG(2) << "Button " << event.button()
 271               << (event.button_down() ? " down" : " up");
 272       int button_change = 1 << (event.button() - 1);
 273       if (event.button_down())
 274         mouse_button_state_ |= button_change;
 275       else
 276         mouse_button_state_ &= ~button_change;
 277     } else {
 278       VLOG(1) << "Unknown mouse button: " << event.button();
 279     }
 280   }
 281   // We use the deprecated CGPostMouseEvent API because we receive low-level
 282   // mouse events, whereas CGEventCreateMouseEvent is for injecting higher-level
 283   // events. For example, the deprecated APIs will detect double-clicks or drags
 284   // in a way that is consistent with how they would be generated using a local
 285   // mouse, whereas the new APIs expect us to inject these higher-level events
 286   // directly.
 287   CGPoint position = CGPointMake(mouse_pos_.x(), mouse_pos_.y());
 288   enum {
 289     LeftBit = 1 << (MouseEvent::BUTTON_LEFT - 1),
 290     MiddleBit = 1 << (MouseEvent::BUTTON_MIDDLE - 1),
 291     RightBit = 1 << (MouseEvent::BUTTON_RIGHT - 1)
 292   };
 293 #pragma clang diagnostic push
 294 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
 295   CGError error = CGPostMouseEvent(position, true, 3,
 296                                    (mouse_button_state_ & LeftBit) != 0,
 297                                    (mouse_button_state_ & RightBit) != 0,
 298                                    (mouse_button_state_ & MiddleBit) != 0);
 299 #pragma clang diagnostic pop
 300   if (error != kCGErrorSuccess)
 301     LOG(WARNING) << "CGPostMouseEvent error " << error;
 302
 303   if (event.has_wheel_delta_x() && event.has_wheel_delta_y()) {
 304     int delta_x = static_cast<int>(event.wheel_delta_x());
 305     int delta_y = static_cast<int>(event.wheel_delta_y());
 306     base::ScopedCFTypeRef<CGEventRef> event(CGEventCreateScrollWheelEvent(
 307         NULL, kCGScrollEventUnitPixel, 2, delta_y, delta_x));
 308     if (event)
 309       CGEventPost(kCGSessionEventTap, event);
 310   }
 311 }
 312
 313 void InputInjectorMac::Core::Start(
 314     scoped_ptr<protocol::ClipboardStub> client_clipboard) {
 315   if (!task_runner_->BelongsToCurrentThread()) {
 316     task_runner_->PostTask(
 317         FROM_HERE,
 318         base::Bind(&Core::Start, this, base::Passed(&client_clipboard)));
 319     return;
 320   }
 321
 322   clipboard_->Start(client_clipboard.Pass());
 323 }
 324
 325 void InputInjectorMac::Core::Stop() {
 326   if (!task_runner_->BelongsToCurrentThread()) {
 327     task_runner_->PostTask(FROM_HERE, base::Bind(&Core::Stop, this));
 328     return;
 329   }
 330
 331   clipboard_->Stop();
 332 }
 333
 334 InputInjectorMac::Core::~Core() {}
 335
 336 }  // namespace
 337
 338 scoped_ptr<InputInjector> InputInjector::Create(
 339     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
 340     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
 341   return scoped_ptr<InputInjector>(new InputInjectorMac(main_task_runner));
 342 }
 343
 344 }  // namespace remoting