private static object OnCoerceHeaderStyle(DependencyObject d, object baseValue)
{
var row = (DataGridRow)d;
return(DataGridHelper.GetCoercedTransferPropertyValue(
row,
baseValue,
HeaderStyleProperty,
row.DataGridOwner,
DataGrid.RowHeaderStyleProperty));
}
private static object OnCoerceValidationErrorTemplate(DependencyObject d, object baseValue)
{
var row = (DataGridRow)d;
return(DataGridHelper.GetCoercedTransferPropertyValue(
row,
baseValue,
ValidationErrorTemplateProperty,
row.DataGridOwner,
DataGrid.RowValidationErrorTemplateProperty));
}
/// <summary>
/// Called when a cell's value is to be cancelled, just before it exits edit mode.
/// </summary>
/// <param name="editingElement">A reference to element returned by GenerateEditingElement.</param>
/// <param name="uneditedValue">UneditedValue</param>
protected override void CancelCellEdit(FrameworkElement editingElement, object uneditedValue)
{
ComboBox comboBox = editingElement as ComboBox;
if (comboBox != null)
{
DataGridHelper.UpdateTarget(comboBox, ComboBox.SelectedValueProperty);
DataGridHelper.UpdateTarget(comboBox, ComboBox.SelectedItemProperty);
DataGridHelper.UpdateTarget(comboBox, ComboBox.TextProperty);
}
}
private static object OnCoerceDetailsTemplateSelector(DependencyObject d, object baseValue)
{
var row = (DataGridRow)d;
return(DataGridHelper.GetCoercedTransferPropertyValue(
row,
baseValue,
DetailsTemplateSelectorProperty,
row.DataGridOwner,
DataGrid.RowDetailsTemplateSelectorProperty));
}
/// <summary>
/// Called when a cell's value is to be committed, just before it exits edit mode.
/// </summary>
/// <param name="editingElement">A reference to element returned by GenerateEditingElement.</param>
/// <returns>false if there is a validation error. true otherwise.</returns>
protected override bool CommitCellEdit(FrameworkElement editingElement)
{
TextBox textBox = editingElement as TextBox;
if (textBox != null)
{
DataGridHelper.UpdateSource(textBox, TextBox.TextProperty);
return(!Validation.GetHasError(textBox));
}
return(true);
}
/// <summary>
/// Called when a cell's value is to be committed, just before it exits edit mode.
/// </summary>
/// <param name="editingElement">A reference to element returned by GenerateEditingElement.</param>
/// <returns>false if there is a validation error. true otherwise.</returns>
protected override bool CommitCellEdit(FrameworkElement editingElement)
{
CheckBox checkBox = editingElement as CheckBox;
if (checkBox != null)
{
DataGridHelper.UpdateSource(checkBox, CheckBox.IsCheckedProperty);
return(!Validation.GetHasError(checkBox));
}
return(true);
}
private static object OnCoerceSortMemberPath(DependencyObject d, object baseValue)
{
var column = (DataGridComboBoxColumn)d;
var sortMemberPath = (string)baseValue;
if (string.IsNullOrEmpty(sortMemberPath))
{
sortMemberPath = DataGridHelper.GetPathFromBinding(column.EffectiveBinding as Binding);
}
return(sortMemberPath);
}
protected internal override void RefreshCellContent(FrameworkElement element, string propertyName)
{
DataGridCell cell = element as DataGridCell;
if (cell != null)
{
bool isCellEditing = cell.IsEditing;
if ((string.Compare(propertyName, "ElementStyle", StringComparison.Ordinal) == 0 && !isCellEditing) ||
(string.Compare(propertyName, "EditingElementStyle", StringComparison.Ordinal) == 0 && isCellEditing))
{
cell.BuildVisualTree();
}
else
{
ComboBox comboBox = cell.Content as ComboBox;
switch (propertyName)
{
case "SelectedItemBinding":
ApplyBinding(SelectedItemBinding, comboBox, ComboBox.SelectedItemProperty);
break;
case "SelectedValueBinding":
ApplyBinding(SelectedValueBinding, comboBox, ComboBox.SelectedValueProperty);
break;
case "TextBinding":
ApplyBinding(TextBinding, comboBox, ComboBox.TextProperty);
break;
case "SelectedValuePath":
DataGridHelper.SyncColumnProperty(this, comboBox, ComboBox.SelectedValuePathProperty, SelectedValuePathProperty);
break;
case "DisplayMemberPath":
DataGridHelper.SyncColumnProperty(this, comboBox, ComboBox.DisplayMemberPathProperty, DisplayMemberPathProperty);
break;
case "ItemsSource":
DataGridHelper.SyncColumnProperty(this, comboBox, ComboBox.ItemsSourceProperty, ItemsSourceProperty);
break;
default:
base.RefreshCellContent(element, propertyName);
break;
}
}
}
else
{
base.RefreshCellContent(element, propertyName);
}
}
private static void OnAnyGotFocus(object sender, RoutedEventArgs e)
{
DataGridCell cell = DataGridHelper.FindVisualParent <DataGridCell>(e.OriginalSource as UIElement);
if (cell != null && cell == sender)
{
DataGrid owner = cell.DataGridOwner;
if (owner != null)
{
owner.FocusedCell = cell;
}
}
}
private static object OnCoerceStyle(DependencyObject d, object baseValue)
{
var cell = d as DataGridCell;
return(DataGridHelper.GetCoercedTransferPropertyValue(
cell,
baseValue,
StyleProperty,
cell.Column,
DataGridColumn.CellStyleProperty,
cell.DataGridOwner,
DataGrid.CellStyleProperty));
}
/// <summary>
/// OnRender. Overriden to draw a vertical line on the right.
/// </summary>
/// <param name="drawingContext"></param>
protected override void OnRender(DrawingContext drawingContext)
{
base.OnRender(drawingContext);
if (DataGridHelper.IsGridLineVisible(DataGridOwner, /*isHorizontal = */ false))
{
double thickness = DataGridOwner.VerticalGridLineThickness;
Rect rect = new Rect(new Size(thickness, RenderSize.Height));
rect.X = RenderSize.Width - thickness;
drawingContext.DrawRectangle(DataGridOwner.VerticalGridLinesBrush, null, rect);
}
}
/// <summary>
/// Called when a cell's value is to be committed, just before it exits edit mode.
/// </summary>
/// <param name="editingElement">A reference to element returned by GenerateEditingElement.</param>
/// <returns>false if there is a validation error. true otherwise.</returns>
protected override bool CommitCellEdit(FrameworkElement editingElement)
{
ComboBox comboBox = editingElement as ComboBox;
if (comboBox != null)
{
DataGridHelper.UpdateSource(comboBox, ComboBox.SelectedValueProperty);
DataGridHelper.UpdateSource(comboBox, ComboBox.SelectedItemProperty);
DataGridHelper.UpdateSource(comboBox, ComboBox.TextProperty);
return(!Validation.GetHasError(comboBox));
}
return(true);
}
private static object OnCoerceIsReadOnly(DependencyObject d, object baseValue)
{
var cell = d as DataGridCell;
var column = cell.Column;
var dataGrid = cell.DataGridOwner;
// We dont use the cell & 'baseValue' here because this property is read only on cell.
// the column may coerce a default value to 'true', so we'll use it's effective value for IsReadOnly
// as the baseValue.
return(DataGridHelper.GetCoercedTransferPropertyValue(
column,
column.IsReadOnly,
DataGridColumn.IsReadOnlyProperty,
dataGrid,
DataGrid.IsReadOnlyProperty));
}
private static void OnAnyLostFocus(object sender, RoutedEventArgs e)
{
// Get the ancestor cell of old focused element.
// Set DataGrid.FocusedCell to null, if the cell doesn't
// have keyboard focus.
DataGridCell cell = DataGridHelper.FindVisualParent <DataGridCell>(e.OriginalSource as UIElement);
if (cell != null && cell == sender)
{
DataGrid owner = cell.DataGridOwner;
if (owner != null && !cell.IsKeyboardFocusWithin && owner.FocusedCell == cell)
{
owner.FocusedCell = null;
}
}
}
/// <summary>
/// Arrange. This is overriden so that the cell can position its content to account for a grid line on the right.
/// </summary>
/// <param name="arrangeSize">Arrange size</param>
protected override Size ArrangeOverride(Size arrangeSize)
{
// We don't need to adjust the Arrange position of the content. By default it is arranged at 0,0 and we're
// adding a line to the right. All we have to do is compress and extend the size, just like Measure.
if (DataGridHelper.IsGridLineVisible(DataGridOwner, /*isHorizontal = */ false))
{
double thickness = DataGridOwner.VerticalGridLineThickness;
Size returnSize = base.ArrangeOverride(DataGridHelper.SubtractFromSize(arrangeSize, thickness, /*height = */ false));
returnSize.Width += thickness;
return(returnSize);
}
else
{
return(base.ArrangeOverride(arrangeSize));
}
}
/// <summary>
/// General notification for DependencyProperty changes from the grid or from columns.
/// </summary>
internal void NotifyPropertyChanged(DependencyObject d, string propertyName, DependencyPropertyChangedEventArgs e, NotificationTarget target)
{
DataGridColumn column = d as DataGridColumn;
if ((column != null) && (column != Column))
{
// This notification does not apply to this cell
return;
}
// All the notifications which are to be handled by the cell
if (DataGridHelper.ShouldNotifyCells(target))
{
if (e.Property == DataGridColumn.WidthProperty)
{
DataGridHelper.OnColumnWidthChanged(this, e);
}
else if (e.Property == DataGrid.CellStyleProperty || e.Property == DataGridColumn.CellStyleProperty || e.Property == StyleProperty)
{
DataGridHelper.TransferProperty(this, StyleProperty);
}
else if (e.Property == DataGrid.IsReadOnlyProperty || e.Property == DataGridColumn.IsReadOnlyProperty || e.Property == IsReadOnlyProperty)
{
DataGridHelper.TransferProperty(this, IsReadOnlyProperty);
}
else if (e.Property == DataGridColumn.DisplayIndexProperty)
{
TabIndex = column.DisplayIndex;
}
}
// All the notifications which needs forward to columns
if (DataGridHelper.ShouldRefreshCellContent(target))
{
if (column != null && NeedsVisualTree)
{
if (!string.IsNullOrEmpty(propertyName))
{
column.RefreshCellContent(this, propertyName);
}
else if (e != null && e.Property != null)
{
column.RefreshCellContent(this, e.Property.Name);
}
}
}
}
// Different parts of the DataGrid draw different pieces of the GridLines.
// Cells draw a single line on their right side.
/// <summary>
/// Measure. This is overridden so that the cell can extend its size to account for a grid line on the right.
/// </summary>
protected override Size MeasureOverride(Size constraint)
{
// Make space for the GridLine on the right:
// Remove space from the constraint (since it implicitly includes the GridLine's thickness),
// call the base implementation, and add the thickness back for the returned size.
if (DataGridHelper.IsGridLineVisible(DataGridOwner, /*isHorizontal = */ false))
{
double thickness = DataGridOwner.VerticalGridLineThickness;
Size desiredSize = base.MeasureOverride(DataGridHelper.SubtractFromSize(constraint, thickness, /*height = */ false));
desiredSize.Width += thickness;
return(desiredSize);
}
else
{
return(base.MeasureOverride(constraint));
}
}
/// <summary>
/// Prepares a cell for use.
/// </summary>
/// <remarks>
/// Updates the column reference.
/// </remarks>
internal void PrepareCell(object item, DataGridRow ownerRow, int index)
{
Debug.Assert(_owner == null || _owner == ownerRow, "_owner should be null before PrepareCell is called or the same value as the ownerRow.");
_owner = ownerRow;
DataGrid dataGrid = _owner.DataGridOwner;
if (dataGrid != null)
{
// The index of the container should correspond to the index of the column
if ((index >= 0) && (index < dataGrid.Columns.Count))
{
// Retrieve the column definition and pass it to the cell container
DataGridColumn column = dataGrid.Columns[index];
Column = column;
TabIndex = column.DisplayIndex;
}
if (IsEditing)
{
// If IsEditing was left on and this container was recycled, reset it here.
// Setting this property will result in BuildVisualTree being called.
IsEditing = false;
}
else if ((Content as FrameworkElement) == null)
{
// If there isn't already a visual tree, then create one.
BuildVisualTree();
if (!NeedsVisualTree)
{
Content = item;
}
}
// Update cell Selection
bool isSelected = dataGrid.SelectedCellsInternal.Contains(this);
SyncIsSelected(isSelected);
}
DataGridHelper.TransferProperty(this, StyleProperty);
DataGridHelper.TransferProperty(this, IsReadOnlyProperty);
CoerceValue(ClipProperty);
}
/// <summary>
/// Coercion call back for clip property which ensures that the cell overlapping with frozen
/// column gets clipped appropriately.
/// </summary>
/// <param name="d"></param>
/// <param name="baseValue"></param>
/// <returns></returns>
private static object OnCoerceClip(DependencyObject d, object baseValue)
{
DataGridCell cell = (DataGridCell)d;
Geometry geometry = baseValue as Geometry;
Geometry frozenGeometry = DataGridHelper.GetFrozenClipForCell(cell);
if (frozenGeometry != null)
{
if (geometry == null)
{
return(frozenGeometry);
}
geometry = new CombinedGeometry(GeometryCombineMode.Intersect, geometry, frozenGeometry);
}
return(geometry);
}
protected internal override void RefreshCellContent(FrameworkElement element, string propertyName)
{
DataGridCell cell = element as DataGridCell;
if (cell != null)
{
FrameworkElement textElement = cell.Content as FrameworkElement;
if (textElement != null)
{
switch (propertyName)
{
case "FontFamily":
DataGridHelper.SyncColumnProperty(this, textElement, TextElement.FontFamilyProperty, FontFamilyProperty);
break;
case "FontSize":
DataGridHelper.SyncColumnProperty(this, textElement, TextElement.FontSizeProperty, FontSizeProperty);
break;
case "FontStyle":
DataGridHelper.SyncColumnProperty(this, textElement, TextElement.FontStyleProperty, FontStyleProperty);
break;
case "FontWeight":
DataGridHelper.SyncColumnProperty(this, textElement, TextElement.FontWeightProperty, FontWeightProperty);
break;
case "Foreground":
DataGridHelper.SyncColumnProperty(this, textElement, TextElement.ForegroundProperty, ForegroundProperty);
break;
}
}
}
base.RefreshCellContent(element, propertyName);
}
private static object OnCoerceDetailsVisibility(DependencyObject d, object baseValue)
{
var row = (DataGridRow)d;
object visibility = DataGridHelper.GetCoercedTransferPropertyValue(
row,
baseValue,
DetailsVisibilityProperty,
row.DataGridOwner,
DataGrid.RowDetailsVisibilityModeProperty);
if (visibility is DataGridRowDetailsVisibilityMode)
{
var visibilityMode = (DataGridRowDetailsVisibilityMode)visibility;
var hasDetailsTemplate = row.DetailsTemplate != null || row.DetailsTemplateSelector != null;
var isRealItem = row.Item != CollectionView.NewItemPlaceholder;
switch (visibilityMode)
{
case DataGridRowDetailsVisibilityMode.Collapsed:
visibility = Visibility.Collapsed;
break;
case DataGridRowDetailsVisibilityMode.Visible:
visibility = hasDetailsTemplate && isRealItem ? Visibility.Visible : Visibility.Collapsed;
break;
case DataGridRowDetailsVisibilityMode.VisibleWhenSelected:
visibility = row.IsSelected && hasDetailsTemplate && isRealItem ? Visibility.Visible : Visibility.Collapsed;
break;
default:
visibility = Visibility.Collapsed;
break;
}
}
return(visibility);
}
/// <summary>
/// General notification for DependencyProperty changes from the grid or from columns.
/// </summary>
internal void NotifyPropertyChanged(DependencyObject d, string propertyName, DependencyPropertyChangedEventArgs e, NotificationTarget target)
{
if (DataGridHelper.ShouldNotifyRows(target))
{
if (e.Property == DataGrid.RowBackgroundProperty || e.Property == DataGrid.AlternatingRowBackgroundProperty ||
e.Property == BackgroundProperty || e.Property == AlternationIndexProperty)
{
DataGridHelper.TransferProperty(this, BackgroundProperty);
}
else if (e.Property == DataGrid.RowHeaderStyleProperty || e.Property == HeaderStyleProperty)
{
DataGridHelper.TransferProperty(this, HeaderStyleProperty);
}
else if (e.Property == DataGrid.RowHeaderTemplateProperty || e.Property == HeaderTemplateProperty)
{
DataGridHelper.TransferProperty(this, HeaderTemplateProperty);
}
else if (e.Property == DataGrid.RowHeaderTemplateSelectorProperty || e.Property == HeaderTemplateSelectorProperty)
{
DataGridHelper.TransferProperty(this, HeaderTemplateSelectorProperty);
}
else if (e.Property == DataGrid.RowValidationErrorTemplateProperty || e.Property == ValidationErrorTemplateProperty)
{
DataGridHelper.TransferProperty(this, ValidationErrorTemplateProperty);
}
else if (e.Property == DataGrid.RowDetailsTemplateProperty || e.Property == DetailsTemplateProperty)
{
DataGridHelper.TransferProperty(this, DetailsTemplateProperty);
DataGridHelper.TransferProperty(this, DetailsVisibilityProperty);
}
else if (e.Property == DataGrid.RowDetailsTemplateSelectorProperty || e.Property == DetailsTemplateSelectorProperty)
{
DataGridHelper.TransferProperty(this, DetailsTemplateSelectorProperty);
DataGridHelper.TransferProperty(this, DetailsVisibilityProperty);
}
else if (e.Property == DataGrid.RowDetailsVisibilityModeProperty || e.Property == DetailsVisibilityProperty || e.Property == IsSelectedProperty)
{
DataGridHelper.TransferProperty(this, DetailsVisibilityProperty);
}
else if (e.Property == ItemProperty)
{
OnItemChanged(e.OldValue, e.NewValue);
}
else if (e.Property == HeaderProperty)
{
OnHeaderChanged(e.OldValue, e.NewValue);
}
else if (e.Property == BindingGroupProperty)
{
// Re-run validation, but wait until Binding has occured.
Dispatcher.BeginInvoke(new DispatcherOperationCallback(DelayedValidateWithoutUpdate), DispatcherPriority.DataBind, e.NewValue);
}
}
if (DataGridHelper.ShouldNotifyDetailsPresenter(target))
{
if (DetailsPresenter != null)
{
DetailsPresenter.NotifyPropertyChanged(d, e);
}
}
if (DataGridHelper.ShouldNotifyCellsPresenter(target) ||
DataGridHelper.ShouldNotifyCells(target) ||
DataGridHelper.ShouldRefreshCellContent(target))
{
DataGridCellsPresenter cellsPresenter = CellsPresenter;
if (cellsPresenter != null)
{
cellsPresenter.NotifyPropertyChanged(d, propertyName, e, target);
}
}
if (DataGridHelper.ShouldNotifyRowHeaders(target) && RowHeader != null)
{
RowHeader.NotifyPropertyChanged(d, e);
}
}
/// <summary>
/// Searchs up the visual parent chain from the given element until
/// a DataGridRow element is found.
/// </summary>
/// <param name="element">The descendent of a DataGridRow.</param>
/// <returns>
/// The first ancestor DataGridRow of the element parameter.
/// Returns null of none is found.
/// </returns>
public static DataGridRow GetRowContainingElement(FrameworkElement element)
{
return(DataGridHelper.FindVisualParent <DataGridRow>(element));
}