private void HookContext(DependencyObject oldOwner, DependencyObject newOwner)
{
if (newOwner != null)
{
foreach (var column in this._stableColumns)
{
InheritanceContextHelper.ProvideContextForObject(newOwner, column);
}
}
else
{
foreach (var column in this._stableColumns)
{
InheritanceContextHelper.RemoveContextFromObject(oldOwner, column);
}
}
}
private TreeGridColumnCollectionChangedEventArgs RemoveAtPreprocess(int index)
{
this.VerifyIndexInRange(index, "index");
int actualIndex = this._stableIndices[index];
var column = this._stableColumns[actualIndex];
column.ResetPrivateData();
column.PropertyChanged -= this.ColumnPropertyChanged;
this._stableColumns.RemoveAt(actualIndex);
this.UpdateIndicesOnRemoved(actualIndex, index);
InheritanceContextHelper.RemoveContextFromObject(this._owner, column);
return(new TreeGridColumnCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, column, index, actualIndex));
}
private TreeGridColumnCollectionChangedEventArgs ClearPreprocess()
{
var array = new TreeGridColumn[base.Count];
if (base.Count > 0)
{
base.CopyTo(array, 0);
}
foreach (var column in this._stableColumns)
{
column.ResetPrivateData();
column.PropertyChanged -= this.ColumnPropertyChanged;
InheritanceContextHelper.RemoveContextFromObject(this._owner, column);
}
this._stableColumns.Clear();
this._stableIndices.Clear();
return(new TreeGridColumnCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset, array));
}