remoting/protocol/input_event_tracker.h

   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 #ifndef REMOTING_PROTOCOL_INPUT_EVENT_TRACKER_H_
   6 #define REMOTING_PROTOCOL_INPUT_EVENT_TRACKER_H_
   7
   8 #include <set>
   9
  10 #include "base/basictypes.h"
  11 #include "base/compiler_specific.h"
  12 #include "remoting/protocol/input_stub.h"
  13 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
  14
  15 namespace remoting {
  16 namespace protocol {
  17
  18 // Filtering InputStub which tracks mouse and keyboard input events before
  19 // passing them on to |input_stub|, and can dispatch release events to
  20 // |input_stub| for all currently-pressed keys and buttons when necessary.
  21 class InputEventTracker : public InputStub {
  22  public:
  23   explicit InputEventTracker(protocol::InputStub* input_stub);
  24   ~InputEventTracker() override;
  25
  26   // Returns true if the key with the specified USB code is currently pressed.
  27   bool IsKeyPressed(uint32 usb_keycode) const;
  28
  29   // Returns the count of keys currently pressed.
  30   int PressedKeyCount() const;
  31
  32   // Dispatch release events for all currently-pressed keys, mouse buttons, and
  33   // touch points to the InputStub.
  34   void ReleaseAll();
  35
  36   // Similar to ReleaseAll, but conditional on a modifier key tracked by this
  37   // class being pressed without the corresponding parameter indicating that it
  38   // should be.
  39   void ReleaseAllIfModifiersStuck(bool alt_expected, bool ctrl_expected,
  40                                   bool meta_expected, bool shift_expected);
  41
  42   // InputStub interface.
  43   void InjectKeyEvent(const KeyEvent& event) override;
  44   void InjectTextEvent(const TextEvent& event) override;
  45   void InjectMouseEvent(const MouseEvent& event) override;
  46   void InjectTouchEvent(const TouchEvent& event) override;
  47
  48  private:
  49   protocol::InputStub* input_stub_;
  50
  51   std::set<uint32> pressed_keys_;
  52
  53   webrtc::DesktopVector mouse_pos_;
  54   uint32 mouse_button_state_;
  55
  56   std::set<uint32> touch_point_ids_;
  57
  58   DISALLOW_COPY_AND_ASSIGN(InputEventTracker);
  59 };
  60
  61 }  // namespace protocol
  62 }  // namespace remoting
  63
  64 #endif  // REMOTING_PROTOCOL_INPUT_EVENT_TRACKER_H_