remoting/client/plugin/pepper_mouse_locker.cc

   1 // Copyright 2014 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/client/plugin/pepper_mouse_locker.h"
   6
   7 #include "base/logging.h"
   8 #include "remoting/client/plugin/empty_cursor_filter.h"
   9 #include "remoting/proto/control.pb.h"
  10
  11 namespace remoting {
  12
  13 PepperMouseLocker::PepperMouseLocker(
  14     pp::Instance* instance,
  15     const base::Callback<void(bool)>& enable_mouse_deltas,
  16     protocol::CursorShapeStub* cursor_stub)
  17     : pp::MouseLock(instance),
  18       enable_mouse_deltas_(enable_mouse_deltas),
  19       cursor_stub_(cursor_stub),
  20       cursor_shape_(new protocol::CursorShapeInfo),
  21       callback_factory_(this),
  22       has_focus_(false),
  23       mouse_lock_state_(MouseLockOff) {
  24   *cursor_shape_ = EmptyCursorShape();
  25 }
  26
  27 PepperMouseLocker::~PepperMouseLocker() {}
  28
  29 void PepperMouseLocker::DidChangeFocus(bool has_focus) {
  30   has_focus_ = has_focus;
  31   if (has_focus_)
  32     RequestMouseLock();
  33 }
  34
  35 void PepperMouseLocker::SetCursorShape(
  36     const protocol::CursorShapeInfo& cursor_shape) {
  37   *cursor_shape_ = cursor_shape;
  38   if (IsCursorShapeEmpty(*cursor_shape_)) {
  39     RequestMouseLock();
  40   } else {
  41     CancelMouseLock();
  42   }
  43 }
  44
  45 void PepperMouseLocker::MouseLockLost() {
  46   DCHECK(mouse_lock_state_ == MouseLockOn ||
  47          mouse_lock_state_ == MouseLockCancelling);
  48
  49   OnMouseLockOff();
  50 }
  51
  52 void PepperMouseLocker::OnMouseLocked(int error) {
  53   DCHECK(mouse_lock_state_ == MouseLockRequestPending ||
  54          mouse_lock_state_ == MouseLockCancelling);
  55
  56   bool should_cancel = (mouse_lock_state_ == MouseLockCancelling);
  57
  58   // See if the operation succeeded.
  59   if (error == PP_OK) {
  60     mouse_lock_state_ = MouseLockOn;
  61     enable_mouse_deltas_.Run(true);
  62   } else {
  63     OnMouseLockOff();
  64   }
  65
  66   // Cancel as needed.
  67   if (should_cancel)
  68     CancelMouseLock();
  69 }
  70
  71 void PepperMouseLocker::OnMouseLockOff() {
  72   mouse_lock_state_ = MouseLockOff;
  73   cursor_stub_->SetCursorShape(*cursor_shape_);
  74   enable_mouse_deltas_.Run(false);
  75 }
  76
  77 void PepperMouseLocker::RequestMouseLock() {
  78   // Request mouse lock only if the plugin is focused, the host-supplied cursor
  79   // is empty and no callback is pending.
  80   if (!has_focus_)
  81     return;
  82   if (!IsCursorShapeEmpty(*cursor_shape_))
  83     return;
  84   if (mouse_lock_state_ != MouseLockOff)
  85     return;
  86
  87   pp::CompletionCallback callback =
  88       callback_factory_.NewCallback(&PepperMouseLocker::OnMouseLocked);
  89   int result = pp::MouseLock::LockMouse(callback);
  90   if (result != PP_OK_COMPLETIONPENDING) {
  91     LOG(ERROR) << "Unexpected MouseLock result:" << result;
  92     return;
  93   }
  94   mouse_lock_state_ = MouseLockRequestPending;
  95
  96   // Hide cursor to avoid it becoming a black square (see crbug.com/285809).
  97   cursor_stub_->SetCursorShape(EmptyCursorShape());
  98 }
  99
 100 void PepperMouseLocker::CancelMouseLock() {
 101   switch (mouse_lock_state_) {
 102     case MouseLockOff:
 103       OnMouseLockOff();
 104       break;
 105
 106     case MouseLockCancelling:
 107       break;
 108
 109     case MouseLockRequestPending:
 110       // The mouse lock request is pending. Delay UnlockMouse() call until
 111       // the callback is called.
 112       mouse_lock_state_ = MouseLockCancelling;
 113       break;
 114
 115     case MouseLockOn:
 116       pp::MouseLock::UnlockMouse();
 117
 118       // Note that mouse-lock has been cancelled. We will continue to receive
 119       // locked events until MouseLockLost() is called back.
 120       mouse_lock_state_ = MouseLockCancelling;
 121       break;
 122
 123     default:
 124       NOTREACHED();
 125   }
 126 }
 127
 128 }  // namespace remoting