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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/local_input_monitor.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/stringprintf.h"
#include "base/threading/non_thread_safe.h"
#include "base/win/wrapped_window_proc.h"
#include "remoting/host/mouse_move_observer.h"
#include "third_party/skia/include/core/SkPoint.h"
namespace remoting {
namespace {
const wchar_t kWindowClassFormat[] = L"Chromoting_LocalInputMonitorWin_%p";
// From the HID Usage Tables specification.
const USHORT kGenericDesktopPage = 1;
const USHORT kMouseUsage = 2;
class LocalInputMonitorWin : public base::NonThreadSafe,
public LocalInputMonitor {
public:
LocalInputMonitorWin();
~LocalInputMonitorWin();
virtual void Start(MouseMoveObserver* mouse_move_observer,
const base::Closure& disconnect_callback) OVERRIDE;
virtual void Stop() OVERRIDE;
private:
// Handles WM_CREATE messages.
LRESULT OnCreate(HWND hwnd);
// Handles WM_INPUT messages.
LRESULT OnInput(HRAWINPUT input_handle);
// Window procedure invoked by the OS to process window messages.
static LRESULT CALLBACK WindowProc(HWND hwnd, UINT message,
WPARAM wparam, LPARAM lparam);
// Atom representing the input window class.
ATOM atom_;
// Instance of the module containing the window procedure.
HINSTANCE instance_;
// Handle of the input window.
HWND window_;
// Observer to dispatch mouse event notifications to.
MouseMoveObserver* observer_;
DISALLOW_COPY_AND_ASSIGN(LocalInputMonitorWin);
};
LocalInputMonitorWin::LocalInputMonitorWin()
: atom_(0),
instance_(NULL),
window_(NULL),
observer_(NULL) {
}
LocalInputMonitorWin::~LocalInputMonitorWin() {
DCHECK(CalledOnValidThread());
DCHECK(!atom_);
DCHECK(!instance_);
DCHECK(!window_);
DCHECK(!observer_);
}
void LocalInputMonitorWin::Start(MouseMoveObserver* mouse_move_observer,
const base::Closure& disconnect_callback) {
DCHECK(CalledOnValidThread());
DCHECK(!observer_);
DCHECK(mouse_move_observer);
observer_ = mouse_move_observer;
// Create a window for receiving raw input.
string16 window_class_name = base::StringPrintf(kWindowClassFormat, this);
WNDCLASSEX window_class;
base::win::InitializeWindowClass(
window_class_name.c_str(),
&base::win::WrappedWindowProc<WindowProc>,
0, 0, 0, NULL, NULL, NULL, NULL, NULL,
&window_class);
instance_ = window_class.hInstance;
atom_ = RegisterClassEx(&window_class);
if (atom_ == 0) {
LOG_GETLASTERROR(ERROR)
<< "Failed to register the window class '" << window_class_name << "'";
return;
}
window_ = CreateWindow(MAKEINTATOM(atom_), 0, 0, 0, 0, 0, 0, HWND_MESSAGE, 0,
instance_, this);
if (window_ == NULL) {
LOG_GETLASTERROR(ERROR) << "Failed to create the raw input window";
return;
}
}
void LocalInputMonitorWin::Stop() {
DCHECK(CalledOnValidThread());
DCHECK(observer_);
if (window_ != NULL) {
DestroyWindow(window_);
window_ = NULL;
}
if (atom_ != 0) {
UnregisterClass(MAKEINTATOM(atom_), instance_);
atom_ = 0;
instance_ = NULL;
}
observer_ = NULL;
}
LRESULT LocalInputMonitorWin::OnCreate(HWND hwnd) {
DCHECK(CalledOnValidThread());
// Register to receive raw mouse input.
RAWINPUTDEVICE device = {0};
device.dwFlags = RIDEV_INPUTSINK;
device.usUsagePage = kGenericDesktopPage;
device.usUsage = kMouseUsage;
device.hwndTarget = hwnd;
if (!RegisterRawInputDevices(&device, 1, sizeof(device))) {
LOG_GETLASTERROR(ERROR) << "RegisterRawInputDevices() failed";
return -1;
}
return 0;
}
LRESULT LocalInputMonitorWin::OnInput(HRAWINPUT input_handle) {
DCHECK(CalledOnValidThread());
// Get the size of the input record.
UINT size = 0;
UINT result = GetRawInputData(input_handle,
RID_INPUT,
NULL,
&size,
sizeof(RAWINPUTHEADER));
if (result == -1) {
LOG_GETLASTERROR(ERROR) << "GetRawInputData() failed";
return 0;
}
// Retrieve the input record itself.
scoped_array<uint8> buffer(new uint8[size]);
RAWINPUT* input = reinterpret_cast<RAWINPUT*>(buffer.get());
result = GetRawInputData(input_handle,
RID_INPUT,
buffer.get(),
&size,
sizeof(RAWINPUTHEADER));
if (result == -1) {
LOG_GETLASTERROR(ERROR) << "GetRawInputData() failed";
return 0;
}
// Notify the observer about mouse events generated locally. Remote (injected)
// mouse events do not specify a device handle (based on observed behavior).
if (input->header.dwType == RIM_TYPEMOUSE &&
input->header.hDevice != NULL) {
POINT position;
if (!GetCursorPos(&position)) {
position.x = 0;
position.y = 0;
}
observer_->OnLocalMouseMoved(SkIPoint::Make(position.x, position.y));
}
return DefRawInputProc(&input, 1, sizeof(RAWINPUTHEADER));
}
// static
LRESULT CALLBACK LocalInputMonitorWin::WindowProc(
HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
// Store |this| to the window's user data.
if (message == WM_CREATE) {
CREATESTRUCT* cs = reinterpret_cast<CREATESTRUCT*>(lparam);
SetLastError(ERROR_SUCCESS);
LONG_PTR result = SetWindowLongPtr(
hwnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(cs->lpCreateParams));
CHECK(result != 0 || GetLastError() == ERROR_SUCCESS);
}
LocalInputMonitorWin* self = reinterpret_cast<LocalInputMonitorWin*>(
GetWindowLongPtr(hwnd, GWLP_USERDATA));
switch (message) {
case WM_CREATE:
return self->OnCreate(hwnd);
case WM_INPUT:
return self->OnInput(reinterpret_cast<HRAWINPUT>(lparam));
default:
return DefWindowProc(hwnd, message, wparam, lparam);
}
}
} // namespace
scoped_ptr<LocalInputMonitor> LocalInputMonitor::Create() {
return scoped_ptr<LocalInputMonitor>(new LocalInputMonitorWin());
}
} // namespace remoting
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