/// <summary>
/// Called to end an edit operation
/// </summary>
/// <param name="vm"></param>
/// <param name="success">True for persist, False to cancel edits</param>
public void OnEndEdit(ValidatingViewModel vm, bool success)
{
if (!success)
{
RestoreFieldValues(vm, _savedState);
}
_savedState = null;
}
/// <summary>
/// Returns the fields to capture
/// </summary>
/// <param name="target"></param>
/// <returns></returns>
private IEnumerable <FieldInfo> GetFieldsToSerialize(ValidatingViewModel target)
{
EditingViewModel evm = target as EditingViewModel;
Predicate <FieldInfo> testField = (evm != null && evm.FieldPredicate != null) ? evm.FieldPredicate : f => true;
return(target.GetType()
.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)
.Where(f => f.GetType() != typeof(ShallowCopyEditableObject) && testField(f)));
}
public void ReturnsTrueForOutdatedValidationContext()
{
var vm = new ValidatingViewModel();
vm.FirstName = "some value";
var lastUpdated = vm.ValidationContext.LastModifiedTicks;
vm.FirstName = null;
Assert.IsTrue(vm.IsValidationSummaryOutdated(lastUpdated, true));
}
public void ReturnsTrueForOutdatedValidationContext()
{
var vm = new ValidatingViewModel();
vm.FirstName = "some value";
var lastUpdated = vm.ValidationContext.LastModifiedTicks;
vm.FirstName = null;
Assert.IsTrue(vm.IsValidationSummaryOutdated(lastUpdated, true));
}
private List <string> CaptureErrorChanges(ValidatingViewModel obj, Action action)
{
var changes = new List <string>();
obj.ErrorsChanged += (sender, e) =>
{
changes.Add(e.PropertyName);
};
action();
return(changes);
}
public void ReturnsFalseForNotOutdatedValidationContext()
{
var vm = new ValidatingViewModel();
vm.FirstName = "some value";
var lastUpdated = DateTime.Now.Ticks + 1;
// Only full .NET supports reliable stopwatch, all other frameworks always assume outdated
#if NET
Assert.IsFalse(vm.IsValidationSummaryOutdated(lastUpdated, true));
#else
Assert.IsTrue(vm.IsValidationSummaryOutdated(lastUpdated, true));
#endif
}
public void ReturnsFalseForNotOutdatedValidationContext()
{
var vm = new ValidatingViewModel();
vm.FirstName = "some value";
var lastUpdated = DateTime.Now.Ticks + 1;
// Only full .NET supports reliable stopwatch, all other frameworks always assume outdated
#if NET
Assert.IsFalse(vm.IsValidationSummaryOutdated(lastUpdated, true));
#else
Assert.IsTrue(vm.IsValidationSummaryOutdated(lastUpdated, true));
#endif
}
/// <summary>
/// This restores the state of the current object from the passed clone object.
/// </summary>
/// <param name="target"></param>
/// <param name="fieldValues">Object to restore state from</param>
private void RestoreFieldValues(ValidatingViewModel target, Dictionary <string, object> fieldValues)
{
foreach (FieldInfo fi in GetFieldsToSerialize(target))
{
object value;
if (fieldValues.TryGetValue(fi.Name, out value))
{
fi.SetValue(target, value);
}
else
{
Debug.WriteLine("Failed to restore field " + fi.Name + " from cloned values, field not found in Dictionary.");
}
}
}
private void DialogHost_Closing(object sender, CancelEventArgs e)
{
string errorIfInvalidIdentifier = this.Model.GetErrorIfInvalidIdentifier(this.AreaName);
if (!string.IsNullOrEmpty(errorIfInvalidIdentifier))
{
ValidatingViewModel.DisplayErrorMessage(this.DialogHost, errorIfInvalidIdentifier);
e.Cancel = true;
return;
}
if (this.Model.AreaExists(this.AreaName))
{
ValidatingViewModel.DisplayErrorMessage(this.DialogHost, Resources.AreaExistsMessage);
e.Cancel = true;
}
}
/// <summary>
/// This is used to clone the object. Override the method to provide a more efficient clone. The
/// default implementation simply reflects across the object copying every field.
/// </summary>
/// <returns>Clone of current object</returns>
private Dictionary <string, object> GetFieldValues(ValidatingViewModel target)
{
return(GetFieldsToSerialize(target)
.Select(fi => new { Key = fi.Name, Value = fi.GetValue(target) })
.ToDictionary(k => k.Key, k => k.Value));
}
/// <summary>
/// Called to begin an edit operation
/// </summary>
public void OnBeginEdit(ValidatingViewModel vm)
{
_savedState = GetFieldValues(vm);
}
