private void ChangeCurrentDataGridContext()
{
if ((m_dataGridContext.ParentDataGridContext == null) ||
(m_dataGridContext.ParentItem == null))
{
return;
}
List <DataGridContext> childContexts = this.GetParentItemChildContexts();
int currentContextIndex = childContexts.IndexOf(m_dataGridContext);
if (childContexts.Count > 1)
{
if (currentContextIndex < (childContexts.Count - 1))
{
// We are not the last context, we'll search for a
// non-empty context after us.
for (int i = currentContextIndex + 1; i < childContexts.Count; i++)
{
DataGridContext childContext = childContexts[i];
if (childContext.Items.Count == 0)
{
continue;
}
childContext.SetCurrentItemCore(childContext.Items.GetItemAt(0), false, this.ShouldSynchronizeSelectionWithCurrent, AutoScrollCurrentItemSourceTriggers.CollectionViewCurrentItemChanged);
return;
}
}
// No context have been found. We'll search for a
// non-empty context before us.
for (int i = currentContextIndex - 1; i >= 0; i--)
{
DataGridContext childContext = childContexts[i];
int count = childContext.Items.Count;
if (count == 0)
{
continue;
}
childContext.SetCurrentItemCore(childContext.Items.GetItemAt(count - 1), false, this.ShouldSynchronizeSelectionWithCurrent, AutoScrollCurrentItemSourceTriggers.CollectionViewCurrentItemChanged);
return;
}
}
// No context after or before us have been found, we will set the CurrentItem to our ParentItem.
m_dataGridContext.ParentDataGridContext.SetCurrentItemCore(m_dataGridContext.ParentItem, false, this.ShouldSynchronizeSelectionWithCurrent, AutoScrollCurrentItemSourceTriggers.CollectionViewCurrentItemChanged);
}
