// Measure horizontally.
protected override Size MeasureOverride(Size constraint)
{
Size desiredSize = new Size();
DataGridContext dataGridContext = this.DataGridContext;
// DataGridContext can be null when a the parent Row was not prepared
if (dataGridContext == null)
{
return(this.DesiredSize);
}
TableViewColumnVirtualizationManager columnVirtualizationManager = dataGridContext.ColumnVirtualizationManager as TableViewColumnVirtualizationManager;
foreach (Cell cell in this.GetVisibleCells())
{
Debug.Assert(!Row.GetIsTemplateCell(cell), "No template Cells should be added to FixedCellPanel");
cell.Measure(new Size(columnVirtualizationManager.FieldNameToWidth[cell.FieldName], constraint.Height));
if (cell.DesiredSize.Height > desiredSize.Height)
{
desiredSize.Height = cell.DesiredSize.Height;
}
}
desiredSize.Width = columnVirtualizationManager.FixedColumnsWidth;
return(desiredSize);
}
private static void OnColumnReordering(object sender, ColumnReorderingEventArgs e)
{
FixedCellPanel panel = sender as FixedCellPanel;
if (panel == null)
{
return;
}
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(panel);
if (dataGridContext == null)
{
return;
}
TableViewColumnVirtualizationManager columnVirtualizationManager =
dataGridContext.ColumnVirtualizationManager as TableViewColumnVirtualizationManager;
if (columnVirtualizationManager == null)
{
return;
}
int currentFixedColumnCount = columnVirtualizationManager.FixedColumnCount;
// We must be sure the VisiblePosition is converted to visible index since some Columns can be Visible = false
int oldVisiblePosition = FixedCellPanel.CalculateVisibleIndex(e.OldVisiblePosition, dataGridContext);
int newVisiblePosition = FixedCellPanel.CalculateVisibleIndex(e.NewVisiblePosition, dataGridContext);
if ((oldVisiblePosition < columnVirtualizationManager.FixedColumnCount) && (newVisiblePosition >= columnVirtualizationManager.FixedColumnCount))
{
// A column was moved from the fixedPanel to the scrollingPanel
// Do not increment version, it will be done by the FixedColumnCount changed
TableView.SetFixedColumnCount(columnVirtualizationManager.DataGridContext, columnVirtualizationManager.FixedColumnCount - 1);
}
else if ((oldVisiblePosition >= columnVirtualizationManager.FixedColumnCount) && (newVisiblePosition < columnVirtualizationManager.FixedColumnCount))
{
// A column was moved from the scrollingPanel to the fixedPanel
// Do not increment version, it will be done by the FixedColumnCount changed
TableView.SetFixedColumnCount(columnVirtualizationManager.DataGridContext, columnVirtualizationManager.FixedColumnCount + 1);
}
else
{
columnVirtualizationManager.IncrementVersion(new UpdateMeasureRequiredEventArgs(UpdateMeasureTriggeredAction.ColumnReordering));
}
// This must be done to stop progation of the event even
// if only 1 ColumnManagerCell will raise it.
e.Handled = true;
}
private static void OnFirstColumnCompensationOffsetChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
TableViewColumnVirtualizationManager manager = sender as TableViewColumnVirtualizationManager;
if (manager == null)
{
return;
}
manager.m_firstColumnCompensationOffset = ( double )e.NewValue;
manager.IncrementVersion(new UpdateMeasureRequiredEventArgs(UpdateMeasureTriggeredAction.Unspecified));
}
protected override void StopListening(object source)
{
TableViewColumnVirtualizationManager columnVirtualizationManager = source as TableViewColumnVirtualizationManager;
if (columnVirtualizationManager != null)
{
columnVirtualizationManager.UpdateMeasureRequired -= this.OnUpdateMeasureRequired;
return;
}
throw new InvalidOperationException("An attempt was made to use a source other than a ColumnVirtualizationManager.");
}
protected virtual IEnumerable <string> GetVisibleFieldsName()
{
DataGridContext dataGridContext = this.DataGridContext;
if (dataGridContext == null)
{
return(new string[0]);
}
TableViewColumnVirtualizationManager columnVirtualizationManager =
dataGridContext.ColumnVirtualizationManager as TableViewColumnVirtualizationManager;
return(columnVirtualizationManager.FixedFieldNames);
}
private static void OnIsVirtualizingChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
TableViewColumnVirtualizationManager columnVirtualizationManager = o as TableViewColumnVirtualizationManager;
if (columnVirtualizationManager == null)
{
return;
}
if (e.NewValue != null)
{
columnVirtualizationManager.m_flags[( int )TableViewColumnVirtualizationManagerFlags.IsVirtualizing] = ( bool )e.NewValue;
columnVirtualizationManager.IncrementVersion(new UpdateMeasureRequiredEventArgs(UpdateMeasureTriggeredAction.VirtualizationStateChanged));
}
}
private static void OnFixedColumnCountChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
TableViewColumnVirtualizationManager columnVirtualizationManager = o as TableViewColumnVirtualizationManager;
if (columnVirtualizationManager == null)
{
return;
}
if (e.NewValue != null)
{
columnVirtualizationManager.m_fixedColumnCount = ( int )e.NewValue;
// We want to be sure the cells won't be inserted in ScrollingPanel, but added to it
columnVirtualizationManager.IncrementVersion(new UpdateMeasureRequiredEventArgs(UpdateMeasureTriggeredAction.ColumnReordering));
}
}
// Arrange horizontally.
protected override Size ArrangeOverride(Size arrangeSize)
{
DataGridContext dataGridContext = this.DataGridContext;
// DataGridContext can be null when the parent Row was not prepared
if (dataGridContext == null)
{
return(this.DesiredSize);
}
TableViewColumnVirtualizationManager columnVirtualizationManager = dataGridContext.ColumnVirtualizationManager as TableViewColumnVirtualizationManager;
Dictionary <string, double> columnToVisibleOffset = columnVirtualizationManager.FieldNameToOffset;
ScrollViewer parentScrollViewer = dataGridContext.DataGridControl.ScrollViewer;
double horizontalOffset = parentScrollViewer.HorizontalOffset;
double fixedColumnVisibleWidth = columnVirtualizationManager.FixedColumnsWidth;
double firstColumnCompensationOffset = columnVirtualizationManager.FirstColumnCompensationOffset;
Rect finalRect = new Rect(arrangeSize);
foreach (Cell cell in this.GetCellsToLayout())
{
// Calculate the offset of the Cell:
// The original offset of the Column
// - the horizontal offset of the ScrollViewer to scroll to the right
// - the width of the fixed columns since we are in the Scrolling FixedCellSubPanel
// + the compensation offset used in master detail to avoid scrolling when not required
double cellOffset = columnToVisibleOffset[cell.FieldName]
- horizontalOffset
- fixedColumnVisibleWidth
+ firstColumnCompensationOffset;
finalRect.X = cellOffset;
finalRect.Width = cell.DesiredSize.Width;
finalRect.Height = Math.Max(arrangeSize.Height, cell.DesiredSize.Height);
cell.Arrange(finalRect);
}
return(arrangeSize);
}
// Measure horizontally.
protected override Size MeasureOverride(Size constraint)
{
Size desiredSize = new Size();
DataGridContext dataGridContext = this.DataGridContext;
// DataGridContext can be null when a the parent Row was not prepared
if (dataGridContext == null)
{
return(this.DesiredSize);
}
TableViewColumnVirtualizationManager columnVirtualizationManager = dataGridContext.ColumnVirtualizationManager as TableViewColumnVirtualizationManager;
Dictionary <string, double> columnToVisibleWidth = columnVirtualizationManager.FieldNameToWidth;
foreach (Cell cell in this.GetCellsToLayout())
{
double width;
if (columnToVisibleWidth.TryGetValue(cell.FieldName, out width))
{
cell.Measure(new Size(width, constraint.Height));
}
else
{
// The cell will be hidden.
cell.Measure(Size.Empty);
}
if (cell.DesiredSize.Height > desiredSize.Height)
{
desiredSize.Height = cell.DesiredSize.Height;
}
}
desiredSize.Width = columnVirtualizationManager.ScrollingColumnsWidth;
return(desiredSize);
}
internal void UpdateReorderingInfo( TableViewColumnVirtualizationManager columnVirtualizationManager )
{
// Do not create another instance since we want to keep the NewFixedColumnCount
RequiredAnimationsInfo animationState = this.RequiredAnimations;
animationState.AnimateToLeft.Clear();
animationState.AnimateToRight.Clear();
animationState.RollbackAnimation.Clear();
List<ColumnBase> columnsByVisiblePosition = this.InitialColumnsByVisiblePosition;
List<ColumnBase> reorderedColumnsByVisiblePosition = this.ReorderedColumnsByVisiblePosition;
Debug.Assert( this.InitialColumnVisiblePosition < this.InitialColumnsByVisiblePosition.Count );
ColumnBase draggedColumn = this.InitialColumnsByVisiblePosition[ this.InitialColumnVisiblePosition ];
bool draggedColumnReached = false;
int visibleColumnCount = columnsByVisiblePosition.Count;
Dictionary<string, object> columnsInView = columnVirtualizationManager.FixedAndScrollingFieldNamesLookupDictionary;
for( int i = 0; i < visibleColumnCount; i++ )
{
ColumnBase originalColumn = columnsByVisiblePosition[ i ];
ColumnBase reorderedColumn = reorderedColumnsByVisiblePosition[ i ];
if( reorderedColumn == draggedColumn )
{
draggedColumnReached = true;
continue;
}
if( !reorderedColumn.Visible )
continue;
if( originalColumn == reorderedColumn )
{
animationState.RollbackAnimation.Add( reorderedColumn );
continue;
}
if( columnsInView.ContainsKey( reorderedColumn.FieldName ) )
{
if( !draggedColumnReached )
{
animationState.AnimateToLeft.Add( reorderedColumn );
}
else
{
animationState.AnimateToRight.Add( reorderedColumn );
}
}
}
animationState.DraggedColumnNewVisiblePosition = reorderedColumnsByVisiblePosition.IndexOf( draggedColumn );
}
private void AdjustCellTabIndex( TableViewColumnVirtualizationManager columnVirtualizationManager )
{
// The order of the children in the panel is not guaranteed to be good. We do not
// reorder children because we will have to remove and add them at a different location.
// Doing that will cause more calculations to occur, so we only change the TabIndex.
VirtualizingCellCollection collection = this.ParentRowCells;
if( collection == null )
return;
HashSet<string> bindedFields = new HashSet<string>();
foreach( Cell cell in collection.BindedCells )
{
bindedFields.Add( cell.FieldName );
this.AdjustCellTabIndex( columnVirtualizationManager, cell );
}
List<string> targetFields = new List<string>();
targetFields.AddRange( columnVirtualizationManager.FixedFieldNames );
targetFields.AddRange( columnVirtualizationManager.ScrollingFieldNames );
targetFields.AddRange( m_permanentScrollingFieldNames );
foreach( string fieldName in targetFields )
{
if( bindedFields.Contains( fieldName ) )
continue;
Cell cell = collection[ fieldName ];
Debug.Assert( cell != null );
this.AdjustCellTabIndex( columnVirtualizationManager, cell );
}
}
private void UpdateChildren( DataGridContext dataGridContext, TableViewColumnVirtualizationManager columnVirtualizationManager, VirtualizingCellCollection parentRowCells )
{
//Prevent reentrance
if( m_parentRowCells.AlreadyUpdating )
return;
m_parentRowCells.AlreadyUpdating = true;
if( dataGridContext == null )
throw new DataGridInternalException( "DataGridContext is null for FixedCellPanel" );
if( columnVirtualizationManager == null )
throw new DataGridInternalException( "ColumnVirtualizationManager is null for FixedCellPanel" );
if( parentRowCells == null )
return;
this.ClearPermanentScrollingFieldNames();
List<string> currentFieldsName = new List<string>();
currentFieldsName.AddRange( columnVirtualizationManager.FixedFieldNames );
currentFieldsName.AddRange( columnVirtualizationManager.ScrollingFieldNames );
HashSet<Cell> unusedCells = new HashSet<Cell>( parentRowCells.BindedCells );
//Idenfity the binded cells that aren't needed anymore.
foreach( string fieldName in currentFieldsName )
{
ColumnBase column = dataGridContext.Columns[ fieldName ];
Cell cell;
if( parentRowCells.TryGetCell( column, out cell ) )
{
//Certain non recyclable cells like StatCells need their content binding to be updated when they become (or stay) in view.
cell.AddContentBinding();
unusedCells.Remove( cell );
}
}
currentFieldsName.Clear();
currentFieldsName.TrimExcess();
//Release the unused binded cells now in order to minimize the number of cell's creation.
foreach( Cell cell in unusedCells )
{
bool release = this.CanReleaseCell( cell );
//We move the unused cell into the scrolling panel since there is more chance it will be reused there in the future.
this.MoveCellToScrollingPanel( cell, release );
if( release )
{
parentRowCells.Release( cell );
}
//Since the cell cannot be released, it will not be collapsed. We must keep the field name in order to let the scrolling sub-panel measure and arrange the cell out of view.
else
{
//Certain non recyclable cells like StatCells needs their content binding to be removed when they become out of view.
cell.RemoveContentBinding();
this.AddPermanentScrollingFieldNames( cell.FieldName );
}
}
unusedCells.Clear();
unusedCells.TrimExcess();
//Add the missing cells to the fixed region.
foreach( string fieldName in columnVirtualizationManager.FixedFieldNames )
{
//The cell is created if it is missing.
Cell cell = parentRowCells[ fieldName ];
//Make sure the cell is in the appropriate panel.
this.MoveCellToFixedPanel( cell );
}
//Add the missing cells to the scrolling region.
foreach( string fieldName in columnVirtualizationManager.ScrollingFieldNames )
{
//The cell is created if it is missing.
Cell cell = parentRowCells[ fieldName ];
//Make sure the cell is in the appropriate panel.
this.MoveCellToScrollingPanel( cell );
}
if( m_clearUnusedCellsDispatcherOperation == null )
{
m_clearUnusedCellsDispatcherOperation = this.Dispatcher.BeginInvoke( new Action( this.ClearUnusedCells ), DispatcherPriority.ApplicationIdle );
}
m_fixedPanel.InvalidateMeasure();
m_scrollingCellsDecorator.InvalidateMeasure();
m_scrollingPanel.InvalidateMeasure();
m_parentRowCells.AlreadyUpdating = false;
}
private void AdjustCellTabIndex( TableViewColumnVirtualizationManager columnVirtualizationManager, Cell targetCell )
{
int tabIndex;
if( columnVirtualizationManager.FieldNameToPosition.TryGetValue( targetCell.FieldName, out tabIndex ) )
{
if( tabIndex != KeyboardNavigation.GetTabIndex( targetCell ) )
{
KeyboardNavigation.SetTabIndex( targetCell, tabIndex );
}
}
else
{
targetCell.ClearValue( Cell.TabIndexProperty );
}
}
