/// <summary>
/// Raises the <see cref="CurrentItemChanging"/> event.
/// </summary>
/// <param name="args"></param>
protected virtual void OnCurrentItemChanging(CurrentItemChangingEventArgs args)
{
if (this.currentItemChangingEvent != null)
{
this.currentItemChangingEvent(this, args);
}
}
/// <summary>
/// Performs the core logic of updating the current item.
/// </summary>
/// <param name="item">The item that needs to be set as current.</param>
/// <param name="synchronizeOriginal">True to apply the change to the original <see cref="System.ComponentModel.ICollectionView"/> instance (if any), false otherwise.</param>
/// <returns>True if operation was successful, false otherwise.</returns>
protected virtual bool SetCurrentItemCore(IDataSourceItem item, bool synchronizeOriginal)
{
if (this[UpdatingCurrentStateKey])
{
return(false);
}
if (!this.IsNewCurrentItem(item))
{
return(false);
}
CurrentItemChangingEventArgs args = new CurrentItemChangingEventArgs(item, synchronizeOriginal);
this.OnCurrentItemChanging(args);
if (args.Cancel)
{
return(false);
}
this[UpdatingCurrentStateKey] = true;
bool success = true;
if (synchronizeOriginal &&
this.currencyMode == CurrencyManagementMode.LocalAndExternal &&
this.sourceCollectionAsCollectionView != null)
{
success = this.sourceCollectionAsCollectionView.MoveCurrentTo(item == null ? null : item.Value);
}
if (success)
{
this.currentItem = item;
// do not raise CurrentItemChanged if we are currently refreshing the source
if (!this[RefreshingStateKey])
{
this.OnCurrentItemChanged(EventArgs.Empty);
}
}
this[UpdatingCurrentStateKey] = false;
return(success);
}
