/// <summary>
/// Parse the input string, if the input string is a valid date, return the Date, else return null
/// </summary>
/// <param name="text">the input string</param>
/// <remarks>
/// If the input entry equals NullValueText, Value will be set to null
/// If the input entry is a valid date, Value will be set to the input date
/// If the input entry isn't a valid date, InvalidEntry event will be fired, Value will still keep the old value (don't set to null)
/// </remarks>
/// <returns>true if the parsing was successful</returns>
private bool DoParse(string text)
{
if (GetFlag(Flags.IsParsing))
{
return false;
}
DateTime? date = null;
bool isValidDate = true;
SetFlag(Flags.IsTextChanged, false);
SetFlag(Flags.IsParsing, true);
if (text == NullValueText)
{
SetFlag(Flags.IsParsing, false);
}
else
{
//If user provides DateConverter, use it to parse; if not, use default converter
object ret = null;
try
{
CultureInfo cultureInfo = Language != null ? Language.GetSpecificCulture() : null;
if (DateConverter != null)
{
ret = DateConverter.ConvertBack(text, typeof(DateTime), null, cultureInfo);
}
else
{
ret = _defaultDateConverter.ConvertBack(text, typeof(DateTime), null, cultureInfo);
}
}
catch (FormatException)
{
isValidDate = false;
}
finally
{
SetFlag(Flags.IsParsing, false);
}
if (ret is DateTime)
{
date = new DateTime?((DateTime)ret);
}
}
if (isValidDate)
{
//If the input entry is a valid date
//Note: Since DatePicker use coercion for Value/MaxDate/MinDate
//Value = date can't change the Value if date exceeds the range of Max/MinDate
//But in this case, we need to update the EditableTextBox.Text to Value(call UpdateEditableTextBox(DoFormat(Value)))
DateTime? oldValue = Value;
Value = date;
if (oldValue == Value)
{
DoFormat();
}
}
else
{
//If the input entry isn't a valid date, fire InvalidEntry event
SetFlag(Flags.IgnoreUpdateEditableTextBox, true);
try
{
Value = null;
}
finally
{
SetFlag(Flags.IgnoreUpdateEditableTextBox, false);
}
if (EditableTextBoxSite != null)
{
if (!EditableTextBoxSite.IsFocused)
{
EditableTextBoxSite.Focus();
}
EditableTextBoxSite.SelectAll();
}
InvalidEntryEventArgs args = new InvalidEntryEventArgs(InvalidEntryEvent, text);
OnInvalidEntry(args);
}
return isValidDate;
}
/// <summary>
/// This event is invoked when datepicker can't parse the input string correctly
/// </summary>
protected virtual void OnInvalidEntry(InvalidEntryEventArgs e)
{
RaiseEvent(e);
}