public override object ConvertFrom(ITypeDescriptorContext typeDescriptorContext,
CultureInfo cultureInfo, object value)
{
KeyModifierCollection result = new KeyModifierCollection();
string stringValue = value as string;
// convert null as None
if (value == null ||
(stringValue != null && stringValue.Trim() == string.Empty))
{
result.Add(KeyModifier.None);
}
else
{
// respect the following separators: '+', ' ', '|', or ','
foreach (string token in stringValue.Split(new char[] { '+', ' ', '|', ',' },
StringSplitOptions.RemoveEmptyEntries))
{
result.Add((KeyModifier)_keyModifierConverter.ConvertFrom(typeDescriptorContext, cultureInfo, token));
}
// if nothing added, assume None
if (result.Count == 0)
{
result.Add(KeyModifier.None);
}
}
return(result);
}
private bool IsExactMatch()
{
HashSet <KeyModifier> modifiers = this.GetKeyModifiers();
HashSet <Key> keys = this.GetKeysPressed();
// No key must be pressed for the modifier None.
if (this.Contains(KeyModifier.None))
{
return((modifiers.Count == 0) &&
(keys.Count == 0));
}
// Make sure every modifier has a matching key pressed.
foreach (KeyModifier modifier in modifiers)
{
if (!KeyModifierCollection.IsKeyPressed(modifier, keys))
{
return(false);
}
}
// Make sure every key pressed has a matching modifier.
foreach (Key key in keys)
{
if (!KeyModifierCollection.HasModifier(key, modifiers))
{
return(false);
}
}
return(true);
}
private bool MatchAny()
{
if (this.Contains(KeyModifier.None))
{
return(true);
}
HashSet <KeyModifier> modifiers = this.GetKeyModifiers();
HashSet <Key> keys = this.GetKeysPressed();
foreach (KeyModifier modifier in modifiers)
{
if (KeyModifierCollection.IsKeyPressed(modifier, keys))
{
return(true);
}
}
return(false);
}