protected override Size MeasureOverride(Size availableSize)
{
Panel panel = this.GroupLevelIndicatorPaneHost;
if (panel != null)
{
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
if (dataGridContext != null)
{
if (this.GroupLevelIndicatorPaneNeedsRefresh)
{
//clear all the panel's children!
panel.Children.Clear();
DataGridContext previousContext = dataGridContext;
DataGridContext runningDataGridContext = dataGridContext.ParentDataGridContext;
while (runningDataGridContext != null)
{
//create a GroupLevelIndicator to create indentation between the GLIPs
FrameworkElement newGroupMargin = null;
newGroupMargin = new DetailIndicator();
newGroupMargin.DataContext = dataGridContext;
object bindingSource = dataGridContext.GetDefaultDetailConfigurationForContext();
if (bindingSource == null)
{
bindingSource = dataGridContext.SourceDetailConfiguration;
}
//Bind the GroupLevelIndicator`s style to the running DataGridContext`s GroupLevelIndicatorStyle.
Binding groupLevelIndicatorStyleBinding = new Binding();
groupLevelIndicatorStyleBinding.Path = new PropertyPath(DetailConfiguration.DetailIndicatorStyleProperty);
groupLevelIndicatorStyleBinding.Source = bindingSource;
newGroupMargin.SetBinding(StyleProperty, groupLevelIndicatorStyleBinding);
//insert the Spacer GroupLevelIndicator in the panel
panel.Children.Insert(0, newGroupMargin);
//then create the GLIP for the running DataGridContext
GroupLevelIndicatorPane newSubGLIP = new GroupLevelIndicatorPane();
DataGridControl.SetDataGridContext(newSubGLIP, runningDataGridContext);
newSubGLIP.SetIsLeaf(false);
GroupLevelIndicatorPane.SetGroupLevel(newSubGLIP, -1);
//and insert it in the panel.
panel.Children.Insert(0, newSubGLIP);
previousContext = runningDataGridContext;
runningDataGridContext = runningDataGridContext.ParentDataGridContext;
} //end of the loop to cycle through the parent contexts.
} // end if GroupLevelIndicatorPaneNeedsRefresh
} // end if dataGridContext != null
} //end if panel is not null
return(base.MeasureOverride(availableSize));
}
