private void PrepareContainerWorker()
{
DependencyObject visualTree = this.AsVisual();
this.SetContainer(visualTree);
// If the root of a HeaderFooterItem is not a IDataGridItemContainer,
// drill down the VisualTree to ensure there are none
var container = HeaderFooterItem.FindIDataGridItemContainerInChildren(this, visualTree, true);
// Loop to prepare all IDataGridContainer found along the way.
while (container != null)
{
// Row based objects apply their template though their implementation of PrepareContainer.
// No need to call ApplyTemplate beforehand.
if (!(container is Row))
{
var frameworkElement = container as FrameworkElement;
if (frameworkElement != null)
{
frameworkElement.ApplyTemplate();
}
}
container.PrepareContainer(m_initializingDataGridContext, m_initializingDataItem);
container = HeaderFooterItem.FindIDataGridItemContainerInChildren(this, ( DependencyObject )container, false);
}
m_initializingDataGridContext = null;
m_initializingDataItem = null;
}
protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
{
base.OnPropertyChanged(e);
if (e.Property == RowSelector.DataContextProperty)
{
Type rowType = null;
Row row = this.DataContext as Row;
if (row != null)
{
rowType = row.GetType();
}
else
{
HeaderFooterItem hfi = this.DataContext as HeaderFooterItem;
if (hfi != null)
{
row = hfi.AsVisual() as Row;
if (row != null)
{
rowType = row.GetType();
}
}
}
this.SetRowType(rowType);
}
}
internal static IDataGridItemContainer FindIDataGridItemContainerInChildren(HeaderFooterItem headerFooterItem, DependencyObject currentChild, bool checkRoot)
{
if (currentChild == null)
{
return(null);
}
IDataGridItemContainer container = currentChild as IDataGridItemContainer;
if (checkRoot)
{
if (container != null)
{
return(container);
}
}
int childCount = VisualTreeHelper.GetChildrenCount(currentChild);
for (int i = 0; i < childCount; i++)
{
DependencyObject child = VisualTreeHelper.GetChild(currentChild, i);
if (child == null)
{
continue;
}
if (!HeaderFooterItem.IsPartOfHeaderFooterItemTemplate(child, headerFooterItem))
{
// We don't want to parse further the DataTemplate
return(null);
}
container = child as IDataGridItemContainer;
if (container != null)
{
return(container);
}
int innerChildCount = VisualTreeHelper.GetChildrenCount(child);
if (innerChildCount > 0)
{
container = HeaderFooterItem.FindIDataGridItemContainerInChildren(headerFooterItem, child, false);
}
if (container != null)
{
return(container);
}
}
return(null);
}
protected internal void ClearContainer()
{
Visual visual = this.AsVisual();
// If the root of a HeaderFooterItem is not a IDataGridItemContainer,
// drill down the VisualTree to ensure there are none
var container = HeaderFooterItem.FindIDataGridItemContainerInChildren(this, visual);
while (container != null)
{
container.ClearContainer();
container = HeaderFooterItem.FindIDataGridItemContainerInChildren(this, ( DependencyObject )container, false);
}
// Ensure we removed the HeaderFooterItem_Loaded event handler if
// it was not yet loaded
if (m_loadedHandler != null)
{
this.Loaded -= m_loadedHandler;
m_loadedHandler = null;
}
}
private DependencyObject CreateHeaderFooterContainer( object dataItem )
{
if( this.IsRecyclingEnabled )
{
DependencyObject recycledContainer = null;
recycledContainer = this.DequeueHeaderFooterContainer( dataItem );
if( recycledContainer != null )
return recycledContainer;
}
//If the container cannot be recycled, then create a new one.
object realDataItem = dataItem;
if( dataItem.GetType() == typeof( GroupHeaderFooterItem ) )
{
realDataItem = ( ( GroupHeaderFooterItem )dataItem ).Template;
}
DataTemplate template = realDataItem as DataTemplate;
if( template == null )
{
GroupHeaderFooterItemTemplate vwc = realDataItem as GroupHeaderFooterItemTemplate;
if( vwc != null )
{
vwc.Seal();
template = vwc.Template;
}
if( template == null )
throw new DataGridInternalException();
}
HeaderFooterItem newItem = new HeaderFooterItem();
BindingOperations.SetBinding( newItem, HeaderFooterItem.ContentProperty, m_headerFooterDataContextBinding );
newItem.ContentTemplate = template;
return newItem;
}
private static bool IsPartOfHeaderFooterItemTemplate(DependencyObject element, HeaderFooterItem headerFooterItem)
{
while (element != null)
{
DependencyObject templatedParent = null;
var frameworkElement = element as FrameworkElement;
if (frameworkElement != null)
{
templatedParent = frameworkElement.TemplatedParent;
}
else
{
var frameworkContentElement = element as FrameworkContentElement;
if (frameworkContentElement != null)
{
templatedParent = frameworkContentElement.TemplatedParent;
}
}
if (templatedParent == headerFooterItem)
{
return(true);
}
element = templatedParent;
}
return(false);
}
internal static IDataGridItemContainer FindIDataGridItemContainerInChildren(HeaderFooterItem headerFooterItem, DependencyObject currentChild)
{
return(HeaderFooterItem.FindIDataGridItemContainerInChildren(headerFooterItem, currentChild, true));
}
private static bool IsPartOfHeaderFooterItemTemplate( DependencyObject element, HeaderFooterItem headerFooterItem )
{
while( element != null )
{
DependencyObject templatedParent = null;
var frameworkElement = element as FrameworkElement;
if( frameworkElement != null )
{
templatedParent = frameworkElement.TemplatedParent;
}
else
{
var frameworkContentElement = element as FrameworkContentElement;
if( frameworkContentElement != null )
{
templatedParent = frameworkContentElement.TemplatedParent;
}
}
if( templatedParent == headerFooterItem )
return true;
element = templatedParent;
}
return false;
}
internal static IDataGridItemContainer FindIDataGridItemContainerInChildren( HeaderFooterItem headerFooterItem, DependencyObject currentChild, bool checkRoot )
{
if( currentChild == null )
return null;
IDataGridItemContainer container = currentChild as IDataGridItemContainer;
if( checkRoot )
{
if( container != null )
return container;
}
int childCount = VisualTreeHelper.GetChildrenCount( currentChild );
for( int i = 0; i < childCount; i++ )
{
DependencyObject child = VisualTreeHelper.GetChild( currentChild, i );
if( child == null )
continue;
if( !HeaderFooterItem.IsPartOfHeaderFooterItemTemplate( child, headerFooterItem ) )
{
// We don't want to parse further the DataTemplate
return null;
}
container = child as IDataGridItemContainer;
if( container != null )
return container;
int innerChildCount = VisualTreeHelper.GetChildrenCount( child );
if( innerChildCount > 0 )
container = HeaderFooterItem.FindIDataGridItemContainerInChildren( headerFooterItem, child, false );
if( container != null )
return container;
}
return null;
}
internal static IDataGridItemContainer FindIDataGridItemContainerInChildren( HeaderFooterItem headerFooterItem, DependencyObject currentChild )
{
return HeaderFooterItem.FindIDataGridItemContainerInChildren( headerFooterItem, currentChild, true );
}
private static bool IsContainerQualifying(
FrameworkElement container,
DataGridControl gridControl,
double offset,
double viewportSize,
double opposedOffset,
double opposedViewportSize,
Orientation panelOrientation)
{
bool retval = true;
HeaderFooterItem headerFooterItemContainer = container as HeaderFooterItem;
Row rowContainer = container as Row;
//Determine if the Element is Focusable or Navigable
if (headerFooterItemContainer != null)
{
rowContainer = headerFooterItemContainer.AsVisual() as Row;
if (rowContainer == null)
{
//If the HeaderFooter Item is not a Row and is Not focusable, then the item does not qualify.
UIElement uiElementContainer = headerFooterItemContainer.AsVisual() as UIElement;
if ((uiElementContainer == null) || (!uiElementContainer.Focusable))
{
retval = false;
}
}
}
//If the container is a Row (in the headers footers region or not )
if ((retval) && (rowContainer != null))
{
//and the Row is not navigable, then it does not qualify.
if (rowContainer.NavigationBehavior == NavigationBehavior.None)
{
retval = false;
}
}
//If the container still qualifies after first verification, check for the scrolling axis.
if (retval)
{
//if the PrimaryAxis requires the opposed axis to be fully visible.
if (((panelOrientation == Orientation.Vertical) && ((gridControl.ItemsPrimaryAxis == PrimaryAxis.Horizontal) || (gridControl.ItemsPrimaryAxis == PrimaryAxis.Both))) ||
((panelOrientation == Orientation.Horizontal) && ((gridControl.ItemsPrimaryAxis == PrimaryAxis.Vertical) || (gridControl.ItemsPrimaryAxis == PrimaryAxis.Both))))
{
FrameworkElement frameworkElementContainer = container as FrameworkElement;
//Somehow, I decided that a container that is not a FrameworkElement (extremelly highly unprobable) was automaticaly NOT to qualify if opposed axis was required.
if (frameworkElementContainer != null)
{
Vector rowOffset = VisualTreeHelper.GetOffset(frameworkElementContainer);
double computedOffset = (panelOrientation == Orientation.Vertical) ? rowOffset.X : rowOffset.Y;
double computedSize = (panelOrientation == Orientation.Vertical) ? frameworkElementContainer.ActualWidth : frameworkElementContainer.ActualHeight;
//if the coordinates of the Row are NOT inside the Scrolling Axis' viewport... then the item is not qualifyable.
if ((computedOffset < opposedOffset) || ((computedOffset + computedSize) > (opposedViewportSize + opposedOffset)))
{
retval = false;
}
}
else
{
retval = false;
}
}
}
return(retval);
}
private static void RefreshFixedHeaderFooter( DataGridControl dataGrid, Panel targetPanel, ObservableCollection<DataTemplate> collection )
{
TableViewScrollViewer tableViewScrollViewer = dataGrid.ScrollViewer as TableViewScrollViewer;
RowSelectorPane rowSelectorPane = ( tableViewScrollViewer != null ) ? tableViewScrollViewer.RowSelectorPane : null;
foreach( HeaderFooterItem element in targetPanel.Children )
{
if( rowSelectorPane != null )
{
rowSelectorPane.FreeRowSelector( element );
}
dataGrid.ClearItemContainer( element, GetFixedItem( element ) );
DataGridControl.SetDataGridContext( element, null );
}
targetPanel.Children.Clear();
DataGridContext dataGridContext = dataGrid.DataGridContext;
foreach( DataTemplate template in collection )
{
HeaderFooterItem control = new HeaderFooterItem();
control.Content = dataGrid.DataContext;
control.ContentTemplate = template;
DataGridControl.SetDataGridContext( control, dataGridContext );
dataGrid.PrepareItemContainer( control, template );
DataGridControl.SetFixedItem( control, template );
GroupLevelIndicatorPane.SetGroupLevel( control, -1 );
targetPanel.Children.Add( control );
}
}
private static void ProcessUnrealizedEndEdit( DataGridContext dataGridContext )
{
Row row;
object currentItemInEdition = dataGridContext.DataGridControl.m_currentItemInEdition;
//first, determine if the item currently in edition is an Item or a [Group]Header/Footer
if( dataGridContext.Items.Contains( currentItemInEdition ) )
{
//the item currently in edition is a data item.
DependencyObject container = dataGridContext.DataGridControl.CreateContainerForItem();
Debug.Assert( container != null, "CreateContainerForItem() returned null" );
row = container as Row;
}
else
{
DataTemplate template = DataGridControl.GetTemplateForItem( currentItemInEdition );
Debug.Assert( template != null, "DataTemplate for [Group]Header/Footer is null" );
HeaderFooterItem headerFooterItem = new HeaderFooterItem();
headerFooterItem.ContentTemplate = template;
headerFooterItem.Measure( new Size( double.PositiveInfinity, double.PositiveInfinity ) );
row = headerFooterItem.AsVisual() as Row;
}
if( row != null )
{
// Ensure to set the DataGridContext on the Container for the
// PrepareItemContainer to correctly fetch the DataGridContext
DataGridControl.SetDataGridContext( row, dataGridContext );
dataGridContext.DataGridControl.PrepareItemContainer( row, currentItemInEdition );
try
{
row.EndEdit();
}
finally
{
dataGridContext.DataGridControl.ClearItemContainer( row, currentItemInEdition );
}
}
}