/// <summary>
/// Gets the view model path expression.
/// </summary>
public override string GetViewModelPathExpression(RedwoodBindableControl control, RedwoodProperty property)
{
// find the parent markup control and calculate number of DataContext changes
int numberOfDataContextChanges;
var current = control.GetClosestControlBindingTarget(out numberOfDataContextChanges) as RedwoodBindableControl;
current.EnsureControlHasId();
return string.Join(".", Enumerable.Range(0, numberOfDataContextChanges).Select(i => "_parent").Concat(new[] { "_controlState_" + current.ID, Expression }));
}
/// <summary>
/// Evaluates the specified expression.
/// </summary>
public override object Evaluate(RedwoodBindableControl control, RedwoodProperty property)
{
ValidateExpression(Expression);
// find the parent markup control and calculate number of DataContext changes
int numberOfDataContextChanges;
var current = control.GetClosestControlBindingTarget(out numberOfDataContextChanges) as RedwoodBindableControl;
if (current == null || !current.RequiresControlState)
{
throw new Exception("The {controlState: ...} binding can only be used in a markup control that supports ControlState!"); // TODO: exception handling
}
else
{
object value;
return current.ControlState.TryGetValue(Expression, out value) ? value : DefaultValue;
}
}
/// <summary>
/// Finds the binding of the specified type on the specified viewmodel path.
/// </summary>
private CommandBindingExpression FindCommandBinding(string[] path, string command, RedwoodControl viewRootControl, ref string validationTargetPath, out RedwoodBindableControl targetControl, out RedwoodProperty targetProperty)
{
// walk the control tree and find the path
CommandBindingExpression result = null;
RedwoodBindableControl resultControl = null;
RedwoodProperty resultProperty = null;
string resultValidationTargetPath = validationTargetPath;
var walker = new NonEvaluatingControlTreeWalker(viewRootControl);
walker.ProcessControlTree((ViewModel, control) =>
{
// compare path
if (result == null && control is RedwoodBindableControl && ViewModelPathComparer.AreEqual(path, walker.CurrentPathArray))
{
// find bindings of current control
var bindableControl = (RedwoodBindableControl)control;
var binding = bindableControl.GetAllBindings().Where(p => p.Value is CommandBindingExpression)
.FirstOrDefault(b => b.Value.Expression == command);
if (binding.Key != null)
{
// we have found the binding, now get the validation path
var currentValidationTargetPath = KnockoutHelper.GetValidationTargetExpression(bindableControl, true);
if (currentValidationTargetPath == resultValidationTargetPath)
{
// the validation path is equal, we have found the binding
result = (CommandBindingExpression)binding.Value;
resultControl = bindableControl;
resultProperty = binding.Key;
resultValidationTargetPath = KnockoutHelper.GetValidationTargetExpression(bindableControl, false);
}
}
}
});
validationTargetPath = resultValidationTargetPath;
targetControl = resultControl;
targetProperty = resultProperty;
return result;
}
/// <summary>
/// Translates the expression to client script.
/// </summary>
public override string TranslateToClientScript(RedwoodBindableControl control, RedwoodProperty property)
{
ValidateExpression(Expression);
// find the parent markup control and calculate number of DataContext changes
int numberOfDataContextChanges;
var current = control.GetClosestControlBindingTarget(out numberOfDataContextChanges) as RedwoodBindableControl;
current.EnsureControlHasId();
return string.Join(".", Enumerable.Range(0, numberOfDataContextChanges).Select(i => "$parent").Concat(new[] { "$controlState()", current.ID + "()", Expression }));
}
/// <summary>
/// Updates the value.
/// </summary>
public override void UpdateSource(object value, RedwoodBindableControl control, RedwoodProperty property)
{
control.ControlState[property.Name] = value;
}
/// <summary>
/// Evaluates the binding.
/// </summary>
public override object Evaluate(RedwoodBindableControl control, RedwoodProperty property)
{
// TODO: implement server evaluation
throw new NotImplementedException();
}
/// <summary>
/// Translates the binding to client script.
/// </summary>
/// <param name="control"></param>
/// <param name="property"></param>
public override string TranslateToClientScript(RedwoodBindableControl control, RedwoodProperty property)
{
return translator.Translate(Expression);
}
/// <summary> /// Translates the binding to client script. /// </summary> /// <param name="control"></param> /// <param name="property"></param> public abstract string TranslateToClientScript(RedwoodBindableControl control, RedwoodProperty property);
/// <summary> /// Evaluates the binding. /// </summary> public abstract object Evaluate(RedwoodBindableControl control, RedwoodProperty property);
/// <summary>
/// Updates the viewModel with the new value.
/// </summary>
public virtual void UpdateSource(object value, RedwoodBindableControl control, RedwoodProperty property)
{
object target;
var propertyInfo = evaluator.EvaluateProperty(this, property, control, out target);
propertyInfo.SetValue(target, ReflectionUtils.ConvertValue(value, propertyInfo.PropertyType));
}
/// <summary>
/// Gets the view model path expression.
/// </summary>
public virtual string GetViewModelPathExpression(RedwoodBindableControl control, RedwoodProperty property)
{
return Expression;
}
/// <summary>
/// Evaluates the binding.
/// </summary>
public override object Evaluate(RedwoodBindableControl control, RedwoodProperty property)
{
return evaluator.Evaluate(this, property, control);
}