/// <summary>
/// Receives notificaton from a logical key that it has been pressed. The keyboard control
/// uses this notificatoin to monitor and reset modifier keys if necessary.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void LogicalKeyPressed(object sender, LogicalKeyEventArgs e)
{
if (sender is ModifierKeyBase modifierKey)
{
RaiseModifierChangedEvent((VirtualKeyCode)modifierKey.KeyCode, modifierKey.IsInEffect);
}
else // not a modifier key
{
ResetInstantaneousModifierKeys();
}
modifierKeys.OfType <InstantaneousModifierKey>().ToList().ForEach(x => x.SynchroniseKeyState());
}
internal override void ScreenKeyPress()
{
ModifiedKeyStrokes(modifierKeys);
List <WindowsInput.Native.VirtualKeyCode> pressedKeys = new List <WindowsInput.Native.VirtualKeyCode>
{
KeyCode
};
pressedKeys.AddRange(modifierKeys);
LogicalKeyEventArgs args = new LogicalKeyEventArgs(pressedKeys);
OnKeyPress(args);
}
/// <summary>
/// Raises the KeyPressed event.
/// </summary>
/// <param name="args"></param>
protected virtual void OnKeyPress(LogicalKeyEventArgs args)
{
// Get the event handler containing the registered listeners.
EventHandler <LogicalKeyEventArgs> handler = KeyPressed;
// If there are no listeners,
if (handler == null)
{
// Nothing to do.
return;
}
// Extract the list of registered listeners.
Delegate[] listeners = handler.GetInvocationList();
EventHandler <LogicalKeyEventArgs> stateChangeListener;
// For each registered listener in the list,
foreach (Delegate listener in listeners)
{
try
{
// Get the state change listener.
stateChangeListener = listener as EventHandler <LogicalKeyEventArgs>;
// Broadcast the event with the arguments provided.
stateChangeListener?.Invoke(this, args);
}
#pragma warning disable CA1031 // Do not catch general exception types
catch (Exception ex)
#pragma warning restore CA1031 // Do not catch general exception types
{
System.Diagnostics.Trace.WriteLine(string.Format(CultureInfo.CurrentCulture, "KeyPressed listener threw exception: {0}", ex));
// Don't rethrow the exception .
}
}
}