// If a DataGridCollectionViewBase is used, get the ItemProperties it defines to be able to retreive DataGridForeignKeyDescription for each of them
// to get the auto-detected ForeignKey ItemsSource (if any).
// If a DataGridCollectionViewBase is not used, the ItemsSource must be manually specified on each Column in order to correctly display/edit the Data
internal static void UpdateColumnsForeignKeyConfigurationsFromDataGridCollectionView(
ObservableColumnCollection columns,
DataGridItemPropertyCollection itemProperties,
bool autoCreateForeignKeyConfigurations)
{
if (itemProperties == null)
{
return;
}
foreach (var itemProperty in itemProperties)
{
var description = itemProperty.ForeignKeyDescription;
if (description != null)
{
var columnName = PropertyRouteParser.Parse(itemProperty);
var column = (columnName != null) ? columns[columnName] as Column : null;
if (column != null)
{
ForeignKeyConfiguration.SynchronizeForeignKeyConfigurationFromForeignKeyDescription(column, description, autoCreateForeignKeyConfigurations);
}
}
if (itemProperty.ItemPropertiesInternal != null)
{
ForeignKeyConfiguration.UpdateColumnsForeignKeyConfigurationsFromDataGridCollectionView(
columns,
itemProperty.ItemPropertiesInternal,
autoCreateForeignKeyConfigurations);
}
}
}
internal override void OnEditCanceled(DataGridItemEventArgs e)
{
var item = e.Item;
var pageManager = this.RootGroup.GetVirtualPageManager();
// Compare cached values with current values. If they are the same, we can clear the old values which in turn will
// make the item non dirty.
var clearIsDirty = true;
var cachedValues = pageManager.GetCachedValuesForItem(item);
Debug.Assert(cachedValues != null);
var itemProperties = this.ItemProperties;
foreach (var itemProperty in itemProperties)
{
var currentValue = ItemsSourceHelper.GetValueFromItemProperty(itemProperty, item);
if (!(object.Equals(currentValue, cachedValues[PropertyRouteParser.Parse(itemProperty)])))
{
clearIsDirty = false;
break;
}
}
if (clearIsDirty)
{
pageManager.ClearCachedValuesForItem(item);
}
base.OnEditCanceled(e);
}
internal override void OnEditBegun(DataGridItemEventArgs e)
{
var item = e.Item;
var pageManager = this.RootGroup.GetVirtualPageManager();
if (!pageManager.IsItemDirty(item))
{
// First time we enter edit on this item.
var itemProperties = this.ItemProperties;
var count = itemProperties.Count;
var propertyNames = new string[count];
var cachedValues = new object[count];
for (int i = 0; i < count; i++)
{
var itemProperty = itemProperties[i];
propertyNames[i] = PropertyRouteParser.Parse(itemProperty);
cachedValues[i] = ItemsSourceHelper.GetValueFromItemProperty(itemProperty, item);
}
// Cache the values of the never edited before row. This will help the developer find the corresponding row
// in the source when times comes to commit the changes to the data source.
pageManager.SetCachedValuesForItem(item, propertyNames, cachedValues);
}
base.OnEditBegun(e);
}
internal virtual PropertyRouteSegment ToPropertyRouteSegment()
{
var route = PropertyRouteParser.Parse(this.Name);
if ((route == null) || (route.Parent != null))
{
return(new PropertyRouteSegment(PropertyRouteSegmentType.Property, this.Name));
}
return(route.Current);
}
internal static PropertyRoute Combine(PropertyRouteSegment segment, PropertyRoute ancestors)
{
if (ancestors == null)
{
return(new PropertyRoute(segment));
}
if (ancestors.Current.Type != PropertyRouteSegmentType.Other)
{
return(new PropertyRoute(segment, ancestors));
}
var path = PropertyRouteParser.Parse(new PropertyRoute(segment, new PropertyRoute(ancestors.Current)));
Debug.Assert(!string.IsNullOrEmpty(path));
return(new PropertyRoute(new PropertyRouteSegment(PropertyRouteSegmentType.Other, path), ancestors.Parent));
}
private static PropertyRouteSegment ToSegment(DataGridItemPropertyBase itemProperty)
{
Debug.Assert(itemProperty != null);
var route = PropertyRouteParser.Parse(itemProperty.Name);
if (route == null)
{
throw new ArgumentException("Unexpected DataGridItemPropertyBase.Name property value.", "itemProperty");
}
if (route.Parent == null)
{
return(route.Current);
}
return(new PropertyRouteSegment(PropertyRouteSegmentType.Other, itemProperty.Name));
}
private static void UpdateColumnsForeignKeyConfigurationsFromPropertyDescriptions(
ObservableColumnCollection columns,
PropertyDescriptionRouteDictionary propertyDescriptions,
bool autoCreateForeignKeyConfigurations)
{
if ((columns == null) || (propertyDescriptions == null))
{
return;
}
foreach (var column in columns)
{
var targetColumn = column as Column;
if (targetColumn == null)
{
continue;
}
var key = PropertyRouteParser.Parse(targetColumn.FieldName);
if (key == null)
{
continue;
}
var propertyDescription = propertyDescriptions[key];
if (propertyDescription == null)
{
continue;
}
var foreignKeyDescription = propertyDescription.Current.ForeignKeyDescription;
if (foreignKeyDescription == null)
{
continue;
}
ForeignKeyConfiguration.SynchronizeForeignKeyConfigurationFromForeignKeyDescription(targetColumn, foreignKeyDescription, autoCreateForeignKeyConfigurations);
}
}
internal static string Parse(DataGridItemPropertyBase itemProperty)
{
return(PropertyRouteParser.Parse(PropertyRouteBuilder.ToPropertyRoute(DataGridItemPropertyRoute.Create(itemProperty))));
}
