app如何从底层监听Win8系统的鼠标消息和键盘消息

// Keyboard and mouse navigation only apply when occupying the entire window
if (this.ActualHeight == Window.Current.Bounds.Height &&
this.ActualWidth == Window.Current.Bounds.Width)
{
// Listen to the window directly so focus isn't required
Window.Current.CoreWindow.Dispatcher.AcceleratorKeyActivated +=
CoreDispatcher_AcceleratorKeyActivated;
Window.Current.CoreWindow.PointerPressed +=
this.CoreWindow_PointerPressed;
}

/// <summary>
/// Invoked on every keystroke, including system keys such as Alt key combinations, when
/// this page is active and occupies the entire window.  Used to detect keyboard navigation
/// between pages even when the page itself doesn't have focus.
/// </summary>
/// <param name="sender">Instance that triggered the event.</param>
/// <param name="args">Event data describing the conditions that led to the event.</param>
private void CoreDispatcher_AcceleratorKeyActivated(CoreDispatcher sender,
AcceleratorKeyEventArgs args)
{
var virtualKey = args.VirtualKey;

// Only investigate further when Left, Right, or the dedicated Previous or Next keys
// are pressed
if ((args.EventType == CoreAcceleratorKeyEventType.SystemKeyDown ||
args.EventType == CoreAcceleratorKeyEventType.KeyDown) &&
(virtualKey == VirtualKey.Left || virtualKey == VirtualKey.Right ||
(int)virtualKey == 166 || (int)virtualKey == 167))
{
var coreWindow = Window.Current.CoreWindow;
var downState = CoreVirtualKeyStates.Down;
bool menuKey = (coreWindow.GetKeyState(VirtualKey.Menu) & downState) == downState;
bool controlKey = (coreWindow.GetKeyState(VirtualKey.Control) & downState) == downState;
bool shiftKey = (coreWindow.GetKeyState(VirtualKey.Shift) & downState) == downState;
bool noModifiers = !menuKey && !controlKey && !shiftKey;
bool onlyAlt = menuKey && !controlKey && !shiftKey;

if (((int)virtualKey == 166 && noModifiers) ||
(virtualKey == VirtualKey.Left && onlyAlt))
{
// When the previous key or Alt+Left are pressed navigate back
args.Handled = true;
this.GoBack(this, new RoutedEventArgs());
}
else if (((int)virtualKey == 167 && noModifiers) ||
(virtualKey == VirtualKey.Right && onlyAlt))
{
// When the next key or Alt+Right are pressed navigate forward
args.Handled = true;
this.GoForward(this, new RoutedEventArgs());
}
}
}

/// <summary>
/// Invoked on every mouse click, touch screen tap, or equivalent interaction when this
/// page is active and occupies the entire window.  Used to detect browser-style next and
/// previous mouse button clicks to navigate between pages.
/// </summary>
/// <param name="sender">Instance that triggered the event.</param>
/// <param name="args">Event data describing the conditions that led to the event.</param>
private void CoreWindow_PointerPressed(CoreWindow sender,
PointerEventArgs args)
{
var properties = args.CurrentPoint.Properties;

// Ignore button chords with the left, right, and middle buttons
if (properties.IsLeftButtonPressed || properties.IsRightButtonPressed ||
properties.IsMiddleButtonPressed) return;

// If back or foward are pressed (but not both) navigate appropriately
bool backPressed = properties.IsXButton1Pressed;
bool forwardPressed = properties.IsXButton2Pressed;
if (backPressed ^ forwardPressed)
{
args.Handled = true;
if (backPressed) this.GoBack(this, new RoutedEventArgs());
if (forwardPressed) this.GoForward(this, new RoutedEventArgs());
}
}