internal void SetRowSelectorPosition(DependencyObject container, Rect containerRect, FrameworkElement referenceElement)
{
Debug.Assert(( Visibility )this.GetValue(RowSelectorPane.VisibilityProperty) == Visibility.Visible, "We should not be creating RowSelectors if we are not Visible.");
// Try to re-use the RowSelector already assigned to the container.
if (this.TryReUseVisibleRowSelector(container, containerRect))
{
return;
}
var decorator = this.RecycleOrCreateRowSelector(container);
Debug.Assert(decorator != null, "An attempt was made to set the position of a row selector that does not exist.");
RowSelectorPane.PrepareRowSelector(decorator, container, containerRect, referenceElement);
m_visibleSelectors.Add(container, decorator);
this.InvalidateMeasure();
}
private static void OnParentGridControlChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
RowSelectorPane rowSelectorPane = ( RowSelectorPane )sender;
DataGridControl newGrid = e.NewValue as DataGridControl;
DataGridControl oldGrid = e.OldValue as DataGridControl;
if (oldGrid != null)
{
// The RowSelectorPane must clear its internal state when the ParentGridControl changes
rowSelectorPane.m_pendingCleanup.Clear();
rowSelectorPane.m_recyclingQueue.Clear();
rowSelectorPane.m_visibleSelectors.Clear();
rowSelectorPane.InternalChildren.Clear();
}
if (newGrid != null)
{
rowSelectorPane.PrepareDefaultStyleKey(newGrid.GetView());
}
rowSelectorPane.InvalidateMeasure();
}
private void CleanUpUnusedRowSelectors()
{
m_pendingCleanupOperation = null;
for (int i = m_pendingCleanup.Count - 1; i >= 0; i--)
{
var decorator = m_pendingCleanup[i];
RowSelectorPane.ClearRowSelector(decorator);
if (decorator.RowSelector != null)
{
m_recyclingQueue.Enqueue(decorator);
}
else
{
// The RowSelector has become useless, so we destroy it.
this.InternalChildren.Remove(decorator);
}
}
m_pendingCleanup.Clear();
}
