private void UpdateBinding()
{
// the CurrentIndex is coerced, so is always valid.
var source = Items.OfType <object>().ElementAtOrDefault(CurrentIndex);
// update CurrentItem, only used for data binding
CurrentItem = source;
if (ElementTitleTextBlock != null)
{
var b = new Binding(TitlePath)
{
Source = source
};
ElementTitleTextBlock.SetBinding(TextBlock.TextProperty, b);
}
if (ElementMessageTextBlock != null)
{
var b = new Binding(MessagePath)
{
Source = source
};
ElementMessageTextBlock.SetBinding(TextBlock.TextProperty, b);
}
if (ElementDetailTextBlock != null)
{
var b = new Binding(DetailPath)
{
Source = source
};
ElementDetailTextBlock.SetBinding(TextBlock.TextProperty, b);
// check if current item has detail value
var e = new BindingEvaluator <string>(b);
string d = e.GetBindingValue(source);
_hasDetail = !string.IsNullOrWhiteSpace(d);
}
else
{
_hasDetail = false;
}
if (_isMouseOver)
{
if (_hasDetail)
{
ShowDetail();
}
else
{
HideDetail();
}
}
}
public override string ToString()
{
var binding = new Binding(Path)
{
Converter = Converter,
ConverterCulture = ConverterCulture,
ConverterParameter = ConverterParameter,
Mode = BindingMode.OneTime,
FallbackValue = FallbackValue,
StringFormat = StringFormat,
TargetNullValue = TargetNullValue
};
Value = BindingEvaluator <object> .GetBindingValue(binding, Source);
return(Value.ToString());
}
private string UndoPop()
{
if (_undoIndex == 0)
{
// try getting binding value
var binding = GetBindingExpression(TextProperty);
if (binding != null)
{
return(BindingEvaluator <string> .GetBindingValue(binding));
}
return(DEFAULT_VALUE);
}
string text = _undoStack[--_undoIndex];
_undoStack[_undoIndex] = null;
return(text);
}
/// <summary>
/// Evaluates the specified source.
/// </summary>
/// <param name="source">The object used as a source for the evaluation.</param>
/// <param name="binding">The binding.</param>
/// <returns>The evaluated binding.</returns>
public static T GetBindingValue(Binding binding, object source)
{
var eval = new BindingEvaluator <T>(binding);
return(eval.GetBindingValue(source));
}
/// <summary>
/// Evaluates the specified source.
/// </summary>
/// <param name="bindingExpression">The binding.</param>
/// <returns>The evaluated binding.</returns>
public static T GetBindingValue(BindingExpression bindingExpression)
{
var eval = new BindingEvaluator <T>(bindingExpression.ParentBinding);
return(eval.GetBindingValue(bindingExpression.DataItem));
}