/// <summary>
/// Raise the UnitsChanged event when the units change.
/// </summary>
/// <param name="sender">The TermLength</param>
/// <param name="eventArgs">The event arguments.</param>
private static void OnUnitsChanged(DependencyObject sender, DependencyPropertyChangedEventArgs eventArgs)
{
TermLength termLength = sender as TermLength;
termLength.Text = String.Format("{0:0.###} {1}", termLength.Length, termLength.Units == null ? "" : (Object)(TimeUnitList.Default.Find(termLength.Units.Value).TimeUnitCode));
(sender as TermLength).RaiseEvent(new RoutedEventArgs(TermLength.UnitsChangedEvent));
}
/// <summary>
/// Handles a change in the text. Updates the bindings with Length and Units.
/// </summary>
/// <param name="eventArgs">The event arguments</param>
protected override void OnTextChanged(TextChangedEventArgs eventArgs)
{
string[] valueAndUnits = this.Text.Split(new char[] { ' ' }, StringSplitOptions.None);
// BindingExpression binding;
base.OnTextChanged(eventArgs);
#if false
binding = this.GetBindingExpression(TermLength.LengthProperty);
if (binding != null)
{
binding.UpdateTarget();
}
binding = this.GetBindingExpression(TermLength.UnitsProperty);
if (binding != null)
{
binding.UpdateTarget();
}
if (this.SelectionStart == this.Text.Length && this.Units == null && valueAndUnits.Length > 1 && valueAndUnits[1] != "" && !eventArgs.Changes.Any(c => c.RemovedLength > 0))
{
string rest = TermLength.CompleteUnit(valueAndUnits[1]);
this.SelectionLength = rest.Length;
this.Text += rest;
}
#endif
}
/// <summary>
/// Handle the LostFocus event. If necessary, swap in the last valid value.
/// </summary>
/// <param name="eventArgs">The event arguments.</param>
protected override void OnLostKeyboardFocus(KeyboardFocusChangedEventArgs eventArgs)
{
// When the user is done editing, making sure we have valid values for Length and Units.
if (!this.IsReadOnly)
{
string[] valueAndUnits = this.Text.Split(new char[] { ' ' });
if (valueAndUnits.Length > 1)
{
string unitText = TermLength.CompleteUnit(valueAndUnits[1]);
if (!String.IsNullOrEmpty(unitText))
{
try
{
this.Units = TimeUnitList.Default.Find((TimeUnit)Enum.Parse(typeof(TimeUnit), unitText, true)).TimeUnitId;
}
catch
{
this.Units = null;
}
}
}
if (Regex.Match(valueAndUnits[0], @"^[-+]?\d*\.?\d").Success)
{
Boolean parsed = false;
Decimal parsedValue = 0m;
parsed = Decimal.TryParse(valueAndUnits[0], out parsedValue);
this.Length = parsed ? (Decimal?)Math.Abs(parsedValue) : null;
}
if (this.Length == null)
{
this.Length = this.lastValue;
}
if (this.Units == null)
{
this.Units = TimeUnitList.Default.Find(this.lastUnits).TimeUnitId;
}
this.Text = String.Format("{0:0.###} {1}", this.Length, this.Units == null ? "" : (Object)(TimeUnitList.Default.Find(this.Units.Value).TimeUnitCode));
}
base.OnLostKeyboardFocus(eventArgs);
}
/// <summary>
/// Handle the text of the control changing. Maintain the number-space-unit formatting as much as is possible. If the user is typing in the
/// units, try to complete it for them.
/// </summary>
/// <param name="sender">The TermLength.</param>
/// <param name="newText">The event arguments.</param>
private static object CoerceText(DependencyObject sender, object newText)
{
#if false
TermLength termLength = sender as TermLength;
string text = newText as string;
string[] valueAndUnits = text.Split(new char[] { ' ' }, StringSplitOptions.None);
if (!String.IsNullOrEmpty(text) && !Regex.Match(text, @"^[-+]?\d*\.?\d+ +(Days|Weeks|Months)$").Success)
{
string value = "";
string units = "";
int caret = termLength.SelectionStart;
if (valueAndUnits.Length >= 2)
{
value = TermLength.VerifyDecimal(valueAndUnits[0]);
units = TermLength.VerifyUnit(valueAndUnits[1]);
text = value + " " + units;
}
else if (valueAndUnits.Length == 1)
{
if (Regex.Match(valueAndUnits[0], @"\d|\.").Success)
{
value = TermLength.VerifyDecimal(valueAndUnits[0]);
text = value;
}
else
{
units = TermLength.VerifyUnit(valueAndUnits[0]);
text = units;
}
}
if (caret < text.Length && caret >= 0)
{
termLength.SelectionStart = caret;
}
else
{
termLength.SelectionStart = text.Length;
}
}
#endif
return(newText);
}
/// <summary>
/// Create a converter and bind it to a TermLength.
/// </summary>
/// <param name="termLength">The TermLength object this converter is associated with.</param>
public TermLengthConverter(TermLength termLength)
{
this.termLength = termLength;
}
