private static void SubscribeToKeyboardEvents()
{
if (keyboardHookHandle != 0) // Already subscribed.
{
return;
}
keyboardDelegate = KeyboardHookProc;
keyboardHookHandle = Win.SetWindowsHookEx(Win.WH_KEYBOARD_LL, keyboardDelegate, IntPtr.Zero, 0);
HandleAnyErrors(keyboardHookHandle);
}
private static void SubscribeToMouseEvents()
{
if (mouseHookHandle != 0) // Already subscribed.
{
return;
}
mouseDelegate = MouseHookProc;
mouseHookHandle = Win.SetWindowsHookEx(Win.WH_MOUSE_LL, mouseDelegate, IntPtr.Zero, 0);
HandleAnyErrors(mouseHookHandle);
}
private static void UnsubscribeFromKeyboardEvents()
{
if (keyboardHookHandle == 0) // Already unsubscribed.
{
return;
}
if (keyDownHandler != null || keyUpHandler != null) // We have listeners.
{
return;
}
int result = Win.UnhookWindowsHookEx(keyboardHookHandle);
keyboardHookHandle = 0;
keyboardDelegate = null;
HandleAnyErrors(result);
}
private static void TryUnsubscribeFromMouseEvents()
{
if (mouseHookHandle == 0) // Already unsubscribed.
{
return;
}
if (WeHaveMouseEventListeners)
{
return;
}
int result = Win.UnhookWindowsHookEx(mouseHookHandle);
mouseHookHandle = 0;
mouseDelegate = null;
HandleAnyErrors(result);
}
