/// <summary>
/// Updates the framework element based on the given property change.
/// Subclasses can override this method, but typically they can override
/// individual methods for each particular type of property change.
/// </summary>
/// <param name="change">The property change.</param>
protected virtual void UpdateElement(PropertyChange change)
{
if (property == null)
{
return;
}
property.Row = row;
if (change.IncludesEditable())
{
UpdateEditability();
}
if (change.IncludesVisible())
{
UpdateVisibility();
}
if (change.IncludesRequired() || change.IncludesEditable())
{
UpdateRequired();
}
if (change.IncludesValidation() || change.IncludesEditable() || change.IncludesVisible())
{
UpdateValidation();
}
}
/// <summary>
/// Constructs property change event arguments.
/// </summary>
/// <param name="change">The change or combination of changes that took place.</param>
/// <param name="oldValue">The old value before the change.</param>
/// <param name="newValue">The new value after the change.</param>
/// <param name="row">The data row context, if any.</param>
public PropertyChangeEventArgs(PropertyChange change, object oldValue, object newValue, DataRow row)
{
Change = change;
OldValue = oldValue;
NewValue = newValue;
Row = row;
}
/// <summary>
/// Stores specified change to the given property to listen to,
/// or adds the change to the stored property, if one already exists.
/// </summary>
/// <param name="prop">The property to listen to.</param>
/// <param name="change">The property change to listen to.</param>
protected void AddPropertyChange(BaseProperty prop, PropertyChange change)
{
if (properties.ContainsKey(prop))
{
properties[prop] = properties[prop] + change;
}
else
{
properties[prop] = change;
}
}
/// <summary>
/// Get a list of property states for the given property using current descriptions.
/// </summary>
/// <param name="property">The data property to get the states for.</param>
/// <param name="states">The combination of property states to return.</param>
/// <param name="row">Specific data row for list objects, or null for regular data objects.</param>
public virtual IEnumerable <string> GetStates(DataProperty property, PropertyChange states, DataRow row)
{
var state = new HashSet <string>();
if (property.Visible)
{
if (property.Editable)
{
if (property.Required && states.IncludesRequired())
{
state.Add(Required);
}
if (property.Modified == true && states.IncludesValue())
{
state.Add(Modified);
}
if (states.IncludesValidation())
{
var err = property.GetValidationErrors(row);
if (err?.Errors != null)
{
if (err.HasErrors())
{
state.Add(Invalid);
}
else if (err.Errors.Any(e => e.Severity == ErrorSeverity.Warning))
{
state.Add(Warning);
}
else if (err.Errors.Any() || // info?
// don't mark as valid blank or enum and bool properties, since it's not helpful
!property.IsNull(row) && !(property is EnumProperty) && !(property is BooleanProperty))
{
state.Add(Valid);
}
}
}
}
else if (states.IncludesEditable())
{
state.Add(Readonly);
}
}
else if (states.IncludesVisible())
{
state.Add(Hidden);
}
return(state);
}
/// <summary>
/// Asynchronously updates the framework element based on the given property change.
/// Invokes the synchronous version by default, but subclasses can override this method.
/// </summary>
/// <param name="change">The property change.</param>
protected virtual async Task UpdateElementAsync(PropertyChange change)
{
UpdateElement(change);
await Task.CompletedTask;
}
/// <summary>
/// Updates the framework element based on the given property change.
/// Subclasses can override this method, but typically they can override
/// individual methods for each particular type of property change.
/// </summary>
/// <param name="change">The property change.</param>
protected virtual void UpdateElement(PropertyChange change)
{
if (property == null) return;
property.Row = row;
if (change.IncludesEditable()) UpdateEditability();
if (change.IncludesVisible()) UpdateVisibility();
if (change.IncludesRequired() || change.IncludesEditable()) UpdateRequired();
if (change.IncludesValidation() || change.IncludesEditable() || change.IncludesVisible())
UpdateValidation();
}
/// <summary>
/// Constructs property change event arguments.
/// </summary>
/// <param name="change">The change or combination of changes that took place.</param>
/// <param name="oldValue">The old value before the change.</param>
/// <param name="newValue">The new value after the change.</param>
public PropertyChangeEventArgs(PropertyChange change, object oldValue, object newValue)
{
this.change = change;
this.oldValue = oldValue;
this.newValue = newValue;
}
/// <summary>
/// Get space-delimited string with the property states using current descriptions.
/// </summary>
/// <param name="property">The data property to get the states for.</param>
/// <param name="states">The combination of property states to return.</param>
/// <param name="row">Specific data row for list objects, or null for regular data objects.</param>
public virtual string GetStateDescription(DataProperty property, PropertyChange states, DataRow row)
{
var propertyStates = GetStates(property, states, row);
return(string.Join(" ", propertyStates));
}
/// <summary>
/// Constructs property change event arguments.
/// </summary>
/// <param name="change">The change or combination of changes that took place.</param>
/// <param name="oldValue">The old value before the change.</param>
/// <param name="newValue">The new value after the change.</param>
public PropertyChangeEventArgs(PropertyChange change, object oldValue, object newValue)
{
this.change = change;
this.oldValue = oldValue;
this.newValue = newValue;
}