public void VerifyEscapeChar()
{
var maskedTextProvider = new MaskedTextProvider
(TestSimpleDigitMask, '*', true)
{
ResetOnSpace = true
};
Assert.True(maskedTextProvider.VerifyEscapeChar(' ', 0));
Assert.True(maskedTextProvider.VerifyEscapeChar('_', 0));
Assert.False(maskedTextProvider.VerifyEscapeChar('T', 0));
}
private static bool CanReplace(MaskedTextProvider provider, string text, int startPosition, int selectionLength, bool rejectInputOnFirstFailure, out int tentativeCaretIndex)
{
var endPosition = startPosition + selectionLength - 1;
tentativeCaretIndex = -1;
var success = false;
foreach (var character in text)
{
if (!provider.VerifyEscapeChar(character, startPosition))
{
var editPositionFrom = provider.FindEditPositionFrom(startPosition, true);
if (editPositionFrom == MaskedTextProvider.InvalidIndex)
{
break;
}
startPosition = editPositionFrom;
}
var length = endPosition >= startPosition ? 1 : 0;
var overwrite = length > 0;
if (PlaceChar(provider, character, startPosition, length, overwrite, out tentativeCaretIndex))
{
// Only one successfully inserted character is enough to declare the replace operation successful.
success = true;
startPosition = tentativeCaretIndex + 1;
}
else if (rejectInputOnFirstFailure)
{
return(false);
}
}
if ((selectionLength > 0) && (startPosition <= endPosition))
{
// Erase the remaining of the assigned edit character.
int notUsed;
MaskedTextResultHint notUsedHint;
if (!provider.RemoveAt(startPosition, endPosition, out notUsed, out notUsedHint))
{
success = false;
}
}
return(success);
}