remoting/client/plugin/pepper_input_handler.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_CLIENT_PLUGIN_PEPPER_INPUT_HANDLER_H_
   6 #define REMOTING_CLIENT_PLUGIN_PEPPER_INPUT_HANDLER_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9
  10 namespace pp {
  11 class InputEvent;
  12 }  // namespace pp
  13
  14 namespace remoting {
  15
  16 namespace protocol {
  17 class InputStub;
  18 class InputEventTracker;
  19 } // namespace protocol
  20
  21 class PepperInputHandler {
  22  public:
  23   // Create a PepperInputHandler using the specified InputEventTracker to
  24   // handle auto-release. The InputEventTracker instance must remain valid
  25   // for the lifetime of the PepperInputHandler.
  26   explicit PepperInputHandler(protocol::InputEventTracker* input_tracker);
  27
  28   // Sets the input stub to which processed events will be passed.
  29   void set_input_stub(protocol::InputStub* input_stub) {
  30     input_stub_ = input_stub;
  31   }
  32
  33   // Enable or disable sending mouse input when the plugin does not have input
  34   // focus.
  35   void set_send_mouse_input_when_unfocused(bool send) {
  36     send_mouse_input_when_unfocused_ = send;
  37   }
  38
  39   void set_send_mouse_move_deltas(bool enable) {
  40     send_mouse_move_deltas_ = enable;
  41   }
  42
  43   // Enable or disable detection of stuck modifier keys.
  44   void set_detect_stuck_modifiers(bool detect) {
  45     detect_stuck_modifiers_ = detect;
  46   }
  47
  48   // Processes PPAPI events and dispatches them to |input_stub_|.
  49   bool HandleInputEvent(const pp::InputEvent& event);
  50
  51   // Must be called when the plugin receives or loses focus.
  52   void DidChangeFocus(bool has_focus);
  53
  54  private:
  55   // Check for any missed "keyup" events for modifiers. These can sometimes be
  56   // missed due to OS-level keyboard shortcuts such as "lock screen" that cause
  57   // focus to switch to another application. If any modifier keys are held that
  58   // are not indicated as active on |event|, release all keys.
  59   void ReleaseAllIfModifiersStuck(const pp::InputEvent& event);
  60
  61   // Receives input events generated from PPAPI input.
  62   protocol::InputStub* input_stub_;
  63
  64   // Tracks input events to manage auto-release in ReleaseAllIfModifiersStuck.
  65   protocol::InputEventTracker* input_tracker_;
  66
  67   // True if the plugin has focus.
  68   bool has_focus_;
  69
  70   // True if the plugin should respond to mouse input even if it does not have
  71   // keyboard focus.
  72   bool send_mouse_input_when_unfocused_;
  73
  74   // True if the plugin should include mouse move deltas, in addition to
  75   // absolute position information, in mouse events.
  76   bool send_mouse_move_deltas_;
  77
  78   // Accumulated sub-pixel and sub-tick deltas from wheel events.
  79   float wheel_delta_x_;
  80   float wheel_delta_y_;
  81   float wheel_ticks_x_;
  82   float wheel_ticks_y_;
  83
  84   // Whether or not to check for stuck modifier keys on keyboard input events.
  85   bool detect_stuck_modifiers_;
  86
  87   DISALLOW_COPY_AND_ASSIGN(PepperInputHandler);
  88 };
  89
  90 }  // namespace remoting
  91
  92 #endif  // REMOTING_CLIENT_PLUGIN_PEPPER_INPUT_HANDLER_H_