protected override void SavingVisit(DataGridContext sourceContext)
{
if (sourceContext.ParentDataGridContext == m_rootDataGridContext)
{
// Ensure to get a reference to the System.Data.DataRow when doing a
// save/restore of a System.Data.DataRowView since the view is recreated
// for every detail views
object parentItem = ItemsSourceHelper.TryGetDataRowFromDataItem(sourceContext.ParentItem);
m_itemsToExpand.Add(new WeakReference(parentItem));
}
}
public WeakDataGridContextKey(DataGridContext dataGridContext)
{
DataGridContext parentDataGridContext = dataGridContext.ParentDataGridContext;
int level = 0;
while (parentDataGridContext != null)
{
level++;
parentDataGridContext = parentDataGridContext.ParentDataGridContext;
}
System.Diagnostics.Debug.Assert(((level == 0) || (dataGridContext.SourceDetailConfiguration != null)),
"A child dataGridContext must have a SourceDetailConfiguration.");
m_sourceDetailConfigurationRelationName = (dataGridContext.SourceDetailConfiguration != null) ?
dataGridContext.SourceDetailConfiguration.RelationName : string.Empty;
if (level > 0)
{
// We are NOT dealing with the root DataGridContext.
// Build the tree of master items.
m_weakItemsTree = new WeakReference[level];
DataGridContext tempDataGridContext = dataGridContext;
for (int i = level - 1; i >= 0; i--)
{
// Ensure to get a reference to the System.Data.DataRow when doing a
// save/restore of a System.Data.DataRowView since the view is recreated
// for every detail views
object parentItem = ItemsSourceHelper.TryGetDataRowFromDataItem(tempDataGridContext.ParentItem);
m_weakItemsTree[i] = new WeakReference(parentItem);
tempDataGridContext = tempDataGridContext.ParentDataGridContext;
}
}
this.Initialize();
}
internal WeakDataGridContextKey(DataGridContext dataGridContext)
{
var parentDataGridContext = dataGridContext.ParentDataGridContext;
var level = 0;
while (parentDataGridContext != null)
{
level++;
parentDataGridContext = parentDataGridContext.ParentDataGridContext;
}
Debug.Assert(((level == 0) || (dataGridContext.SourceDetailConfiguration != null)), "A child dataGridContext must have a SourceDetailConfiguration.");
m_sourceDetailConfigurationRelationName = (dataGridContext.SourceDetailConfiguration != null) ? dataGridContext.SourceDetailConfiguration.RelationName : string.Empty;
if (level > 0)
{
// We are NOT dealing with the root DataGridContext.
// Build the tree of master items.
m_weakItemsTree = new WeakReference[level];
var tempDataGridContext = dataGridContext;
for (int i = level - 1; i >= 0; i--)
{
// Ensure to get a reference to the System.Data.DataRow when doing a
// save/restore of a System.Data.DataRowView since the view is recreated
// for every detail views
var parentItem = ItemsSourceHelper.TryGetDataRowFromDataItem(tempDataGridContext.ParentItem);
m_weakItemsTree[i] = new WeakReference(parentItem);
tempDataGridContext = tempDataGridContext.ParentDataGridContext;
}
}
m_hashCode = WeakDataGridContextKey.CalculateHashCode(m_sourceDetailConfigurationRelationName, m_weakItemsTree);
}