// Let all observers know which keys are currently pressed
// (after some activity happened).
private void TriggerKeyActivityDetectedEvent(KeyActivity keyActivity)
{
EventHandler<KeyActivityEventArgs> temp = KeyActivityDetected;
if (temp != null)
{
temp(this, new KeyActivityEventArgs(CurrentlyPressed, keyActivity));
}
}
public KeyActivityEventArgs(IEnumerable<int> keys, KeyActivity keyActivity)
{
_keys = keys;
_keyActivity = keyActivity;
}
/// <summary>
/// Extracts the required key press information and triggers an event
/// for KeyActivity.
/// </summary>
/// <returns>false if keyboard activity should be ignored,
/// true otherwise</returns>
private bool ProcessKeyActivity(RAWKEYBOARD rawKeyboard)
{
ushort key = rawKeyboard.VirtualKey;
// Skip the extra key messages for "extended keys"
if (key >= EXTENDED_KEY_FLAG)
{
return false;
}
// Pack the correct left/right information into the key value for
// modifier keys.
FixModifierKeys(ref key, rawKeyboard.Flags, rawKeyboard.MakeCode);
KeyActivity keyActivity = new KeyActivity(key, rawKeyboard.Message);
// TODO: figure out which keyboard it came from??
// http://www.codeproject.com/Articles/17123/
// pass in some sort of id or whatnot into TriggerKeyActivity...
// so that subscribers can distinguish keyboards
// TODO: Handle the pause key better...
if (rawKeyboard.Message == KEYINPUTTYPES.WM_KEYDOWN
|| rawKeyboard.Message == KEYINPUTTYPES.WM_SYSKEYDOWN)
{
// Only trigger activity for new keydown's
if (CurrentlyPressed.Add(key))
{
History.Enqueue(key);
TriggerKeyActivityDetectedEvent(keyActivity);
}
}
else if (rawKeyboard.Message == KEYINPUTTYPES.WM_KEYUP
|| rawKeyboard.Message == KEYINPUTTYPES.WM_SYSKEYUP)
{
CurrentlyPressed.Remove(key);
// always trigger activity for keyup's
TriggerKeyActivityDetectedEvent(keyActivity);
}
return true;
}
