Interface ICellRenderer

Defines the interface for a cell renderer in a VirtualizingCellsControl. A default implementation of this interface is provided by the CellRendererBase<S> class from which you should derive custom cell renderer classes. There is however no dependency on CellRendererBase inside the VirtualizingCellsControl, the VirtualizingCellsControl base class only depends on this interface.

Namespace: Syncfusion.Windows.Controls.Cells

Assembly: Syncfusion.GridCommon.Wpf.dll

Syntax

public interface ICellRenderer

Properties

UnloadUIElementsWhenScrolledOutOfView

Called from ArrangeCellUIElements(Size) to determine whether the parent control should unload visuals when the cell is scrolled out of the viewable area.

Declaration

bool UnloadUIElementsWhenScrolledOutOfView { get; }

Property Value

Type	Description
System.Boolean	true if visuals should be unloaded when scrolled out of view; otherwise, false.

Methods

Arrange(ArrangeCellArgs)

Called OnArrangeCell(ArrangeCellArgs) to arrange the cells UIElement children. CellRendererBase<S> implements this method and calls the virtual OnArrange(ArrangeCellArgs, S) method.

Declaration

void Arrange(ArrangeCellArgs aca)

Parameters

Type	Name	Description
ArrangeCellArgs	aca	The arange cell layout information.

CancelMouseCapture(UIElement)

This method is called from Syncfusion.Windows.Controls.Cells.CellMouseCaptureInfo to take away mouse capture when context of mouse operation changes (e.g. from selecting text inside one cell to selecting multiple cells in a grid)

CellRendererBase<S> implements this method and calls the virtual OnCancelMouseCapture(UIElement) method.

Declaration

void CancelMouseCapture(UIElement element)

Parameters

Type	Name	Description
System.Windows.UIElement	element	The UIElement child

Hide(UIElement)

Hides the specified UIElement. You should implement this method in your renderer and call e.Arrange(new Rect(0, 0, 0, 0)); If this however causes problems then you can instead call e.Visibility = Visibility.Hidden;. Using Arrange has one benefit for example that capture state of a textbox does not get affected.

Declaration

void Hide(UIElement e)

Parameters

Type	Name	Description
System.Windows.UIElement	e	The e.

PrepareUIElements(ArrangeCellArgs, List<UIElement>, ScrollControlChildFrame)

Called from PrepareCellUIElements(ArrangeCellArgs, List<UIElement>, ScrollControlChildFrame) to prepare the cells UIElement children. CellRendererBase<S> implements this method and calls the virtual OnPrepareUIElements(ArrangeCellArgs, List<UIElement>, ScrollControlChildFrame, S) method. VirtualizingCellRendererBase<T> overrides this method and creates new UIElements and wires them with the parent cells control.

Declaration

void PrepareUIElements(ArrangeCellArgs aca, List<UIElement> uiElements, ScrollControlChildFrame canvas)

Parameters

Type	Name	Description
ArrangeCellArgs	aca	The arrange cell layout information.
System.Collections.Generic.List<System.Windows.UIElement>	uiElements	The UI elements.
ScrollControlChildFrame	canvas	The canvas to which any UIElement elements should be added.

RecaptureMouse(UIElement)

This method is called from Syncfusion.Windows.Controls.Cells.CellMouseCaptureInfo to restore mouse capture when context of mouse operation changes back to original context.

CellRendererBase<S> implements this method and calls the virtual OnRecaptureMouse(UIElement) method.

Declaration

void RecaptureMouse(UIElement element)

Parameters

Type	Name	Description
System.Windows.UIElement	element	The UIElement child

RefreshCellUIElementsContent(VirtualizingCellsControl, CellUIElements, RowColumnIndex)

Determine if cell at given cells row and column index is associated with UIElement. If yes, reintialize the cells UIElement. You should implement this method in the cell renderer and redirect the call to RefreshCellUIElementsContent(RowColumnIndex) on the supplied cellsControl. If you have a complex renderer (e.g. a nested grid) for which there is no need to reinitalize contents you can override this method and do nothing. This usually is called as a response to an earlier InvalidateCell(RowColumnIndex). call.

Declaration

void RefreshCellUIElementsContent(VirtualizingCellsControl cellsControl, CellUIElements cellUIElements, RowColumnIndex rowColumnIndex)

Parameters

Type	Name	Description
VirtualizingCellsControl	cellsControl	The cells control.
CellUIElements	cellUIElements	The cell visuals.
RowColumnIndex	rowColumnIndex	Index of the row column.

Render(DrawingContext, RenderCellArgs)

Called from OnRenderCell(DrawingContext, RenderCellArgs) to manually render graphics that do not belong to live controls (e.g. static text). CellRendererBase<S> implements this method and calls the virtual OnRender(DrawingContext, RenderCellArgs, S) method.

Declaration

void Render(DrawingContext dc, RenderCellArgs rca)

Parameters

Type	Name	Description
System.Windows.Media.DrawingContext	dc	The drawing context.
RenderCellArgs	rca	The render cell layout information.

UnloadUIElements(VirtualizingCellsControl, RowColumnIndex, CellUIElements)

This method is called after a cell is scrolled out of view. CellRendererBase<S> implements this method and calls the virtual OnUnloadUIElements(VirtualizingCellsControl, RowColumnIndex, CellUIElements) method. VirtualizingCellRendererBase<T> overrides this method and creates either removes the cell renderer visuals from the parent canvas or hide them and reuse it later in same canvas depending on whether AllowRecycle was set.

Declaration

void UnloadUIElements(VirtualizingCellsControl host, RowColumnIndex cellRowColumnIndex, CellUIElements visuals)

Parameters

Type	Name	Description
VirtualizingCellsControl	host	The host.
RowColumnIndex	cellRowColumnIndex	Index of the cell row column.
CellUIElements	visuals	The visuals.