/// <summary>
/// Binds the framework element to the given property.
/// </summary>
/// <param name="property">The data property to bind the framework element to.</param>
public virtual void BindTo(DataProperty property)
{
if (this.property != null) this.property.Change -= OnPropertyChange;
this.property = property;
this.row = property != null ? property.Row : -1;
if (property != null)
{
OnPropertyBound();
OnPropertyChange(property, new PropertyChangeEventArgs(PropertyChange.All, null, null));
// don't listen for data list properties, as it gets dispatched to the entire column
// and significantly degrades performance
if (property.Column < 0) property.Change += OnPropertyChange;
}
}
/// <summary>
/// Binds the framework element to the given property.
/// </summary>
/// <param name="property">The data property to bind the framework element to.</param>
/// <param name="row">The data row in a list to use as a context.</param>
public virtual void BindTo(DataProperty property, DataRow row)
{
if (this.property != null)
{
this.property.Change -= OnPropertyChange;
}
this.property = property;
this.row = row;
if (property != null)
{
OnPropertyBound();
OnPropertyChange(property, new PropertyChangeEventArgs(PropertyChange.All, null, null, row));
// don't listen for data list properties, as it gets dispatched to the entire column
// and significantly degrades performance
if (!(property.GetParent() is DataListObject))
{
property.Change += OnPropertyChange;
}
}
}
/// <summary>
/// Binds the framework element to the given property.
/// </summary>
/// <param name="property">The data property to bind the framework element to.</param>
public virtual void BindTo(DataProperty property)
{
if (this.property != null)
{
this.property.Change -= OnPropertyChange;
}
this.property = property;
this.row = property != null ? property.Row : -1;
if (property != null)
{
OnPropertyBound();
OnPropertyChange(property, new PropertyChangeEventArgs(PropertyChange.All, null, null));
// don't listen for data list properties, as it gets dispatched to the entire column
// and significantly degrades performance
if (property.Column < 0)
{
property.Change += OnPropertyChange;
}
}
}
/// <summary>
/// A handler of the data context change that finds the data property in the context data object
/// and binds the framework element to it.
/// </summary>
private void OnDataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
{
DependencyObject element = sender as DependencyObject;
if (element == null)
{
return;
}
DataObject obj = element.GetValue(FrameworkElement.DataContextProperty) as DataObject;
string childPath = Property.GetChildObject(element);
obj = FindChildObject(obj, childPath) as DataObject;
string propertyName = Property.GetName(element);
DataProperty dp = null;
if (obj != null && propertyName != null)
{
dp = obj[propertyName];
}
BindTo(dp);
}
/// <summary>
/// Sets the values of the given data row or, if the row is null,
/// the data object from the given data contract object
/// by copying the values of the data contract object fields to the
/// data object properties or child objects with the same names.
/// If there is no exact match between some data contract field names
/// and the data object property names, this method can be overridden
/// in the subclass to address each such case.
/// </summary>
/// <param name="dataContract">The data contract object to copy the values from.</param>
/// <param name="options">Additional options for the operation.</param>
/// <param name="row">The row to set the values for.
/// <param name="token">Cancellation token.</param>
/// Null to set values of the current data object.</param>
protected async Task FromDataContractAsync(object dataContract, object options, DataRow row,
CancellationToken token = default)
{
if (dataContract == null)
{
return;
}
SetModified(false, false);
foreach (PropertyInfo pi in dataContract.GetType().GetProperties())
{
object val = pi.GetValue(dataContract, null);
DataProperty dp = this[pi.Name];
DataObject child;
if (dp != null)
{
dp.Modified = null;
await dp.SetValueAsync(val, row, token);
}
else if ((child = GetChildObject(pi.Name)) != null)
{
await child.FromDataContractAsync(val, options, token);
}
else if (val != null)
{
foreach (PropertyInfo cpi in pi.PropertyType.GetProperties())
{
DataProperty cdp = this[pi.Name + "_" + cpi.Name];
if (cdp != null)
{
cdp.Modified = null;
await cdp.SetValueAsync(cpi.GetValue(val, null), row, token);
}
}
}
}
}
/// <summary>
/// Exports the data object property values and child object values
/// to the given data contract object by setting the specified properties
/// of the data contract to the values of the corresponding properties
/// or child objects with the same names.
/// This method can be used to partially export data object values
/// to a data contract object.
/// </summary>
/// <param name="dataContract">The data contract object to export
/// the current data object values to.</param>
/// <param name="props">The data contract object fields to set.</param>
/// <param name="options">Additional options for the operation.</param>
protected void ToDataContractProperties(object dataContract, PropertyInfo[] props, object options)
{
if (dataContract == null)
{
return;
}
foreach (PropertyInfo pi in props)
{
DataProperty dp = this[pi.Name];
if (dp != null)
{
if (dp.IsValid(true))
{
if (dp.IsMultiValued)
{
IList lst = null;
IEnumerable valLst = dp.TransportValue as IEnumerable;
if (valLst != null)
{
// create the right type of list and copy the values rather than directly assign
lst = CreateInstance(pi.PropertyType) as IList;
if (lst != null)
{
foreach (object o in valLst)
{
lst.Add(o);
}
}
}
pi.SetValue(dataContract, lst, null);
}
else
{
pi.SetValue(dataContract, dp.TransportValue, null);
}
}
continue;
}
object obj = null;
try { obj = CreateInstance(pi.PropertyType); }
catch { continue; }
DataObject child = GetChildObject(pi.Name);
if (child != null)
{
child.ToDataContract(obj, options);
}
else
{
foreach (PropertyInfo cpi in pi.PropertyType.GetProperties())
{
DataProperty cdp = this[pi.Name + "_" + cpi.Name];
if (cdp != null && cdp.IsValid(true))
{
cpi.SetValue(obj, cdp.TransportValue, null);
}
}
}
pi.SetValue(dataContract, obj, null);
}
}
/// <summary>
/// Adds the specified property to the data object.
/// </summary>
/// <param name="property">The property to add to the data object.</param>
internal void AddProperty(DataProperty property)
{
properties[property.Name] = property;
}
/// <summary>
/// Adds the specified property to the data object.
/// </summary>
/// <param name="property">The property to add to the data object.</param>
internal void AddProperty(DataProperty property)
{
properties[property.Name] = property;
}
/// <summary>
/// Adds the specified property to the data object.
/// </summary>
/// <param name="property">The property to add to the data object.</param>
internal void AddProperty(DataProperty property)
{
properties[property.Name] = property;
property.Change += OnDataPropertyChange;
}
/// <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>
/// Returns a list of current field criteria settings.
/// </summary>
public List <FieldCriteriaSetting> GetFieldCriteriaSettings()
{
// get a map of properties
Dictionary <string, DataProperty> map = new Dictionary <string, DataProperty>();
foreach (DataProperty p in Properties)
{
map.Add(p.Name, p);
}
// clear the map from properties that are associated with operators
OperatorProperty op;
foreach (DataProperty p in Properties)
{
if ((op = p as OperatorProperty) == null)
{
continue;
}
if (op.AdditionalPropertyName != null)
{
map.Remove(op.AdditionalPropertyName);
}
if (op.AdditionalPropertyName2 != null)
{
map.Remove(op.AdditionalPropertyName2);
}
}
// export visible non-null settings
List <FieldCriteriaSetting> res = new List <FieldCriteriaSetting>();
foreach (DataProperty p in map.Values)
{
if (p.IsNull() || !p.Visible)
{
continue;
}
if ((op = p as OperatorProperty) != null)
{
List <string> value = new List <string>();
foreach (var apn in new string[] { op.AdditionalPropertyName, op.AdditionalPropertyName2 })
{
DataProperty v = apn != null ? this[apn] : null;
if (v != null && !v.IsNull() && v.Visible)
{
value.Add(v.DisplayStringValue);
}
}
res.Add(new FieldCriteriaSetting
{
Label = p.Label,
Operator = op.DisplayStringValue,
Value = value.ToArray()
});
}
else
{
res.Add(new FieldCriteriaSetting
{
Label = p.Label,
Operator = null,
Value = new string[] { p.DisplayStringValue }
});
}
}
return(res);
}
/// <summary>
/// Binds the framework element to the given property.
/// </summary>
/// <param name="property">The data property to bind the framework element to.</param>
public override void BindTo(DataProperty property)
{
base.BindTo(property);
if (property == null)
{
element.SetValue(Property.ValidationProperty, null);
BindingOperations.ClearBinding(element, ValidationExpressionProperty);
}
}
/// <summary>
/// Copy value and state from another property (presumably of the same type).
/// </summary>
/// <param name="p">The property to copy the state from.</param>
public virtual void CopyFrom(DataProperty p)
{
if (p == null) return;
SetValue(p.InternalValue);
Editable = p.Editable;
Required = p.Required;
AccessLevel = p.AccessLevel;
Visible = p.Visible;
}
/// <summary>
/// A standard validation function that checks for null if the value is required.
/// </summary>
/// <param name="dp">Data property being validated.</param>
/// <param name="value">The value to validate.</param>
public static void ValidateRequired(DataProperty dp, object value)
{
if (dp != null && dp.Required && dp.IsValueNull(value, ValueFormat.Internal))
dp.ValidationErrors.AddError("{0} is required.", dp);
}
