Class DataGridCellRenderer<T1, T2>

A abstract base class for cell renderer classes that need live views displayed in a cell. You can derive from this class and provide the type of the UIElement you want to show inside cells as type parameter. The class provides strong typed virtual methods for initializing Content of the cell and arranging the cell visuals. See DataGridCellRenderer<T1, T2> for more details.

The idea behind this class is to provide a place where we can add general code that should be shared for all cell renderer classes in the tree derived from GridVirtualizingCellRendererBase. While this class does at the moment not add meaningful functionality to DataGridCellRenderer we created this extra layer of inheritance to make it easy to share code for the DataGridCellRenderer base class between grid and common assemblies and keep grid control specific code out of the base class. It is currently not possible with C# to the base class as template type parameter.

Inheritance

System.Object

DataGridCellRenderer<T1, T2>

DataGridCaptionSummaryCellRenderer

DataGridCellTemplateRenderer

DataGridCheckBoxCellRenderer

DataGridComboBoxRenderer

DataGridDateCellRenderer

DataGridGroupSummaryCellRenderer

DataGridHeaderCellRenderer

DataGridImageCellRenderer

DataGridNumericCellRenderer

DataGridRowHeaderCellRenderer

DataGridStackedHeaderCellRenderer

DataGridTableSummaryCellRenderer

DataGridTextBoxCellRenderer

DataGridUnboundCellRenderer

DataGridUnboundRowCellRenderer

DetailsViewExpanderCellRenderer

Implements

IDataGridCellRenderer

System.IDisposable

Namespace: Syncfusion.Maui.DataGrid

Assembly: Syncfusion.Maui.DataGrid.dll

Syntax

public abstract class DataGridCellRenderer<T1, T2> : Object, IDataGridCellRenderer, IDisposable where T1 : View where T2 : View

Type Parameters

Name
T1
T2

Constructors

DataGridCellRenderer()

Declaration

protected DataGridCellRenderer()

Properties

CurrentCellElement

Gets the view of the current cell.

Declaration

public DataGridCell CurrentCellElement { get; }

Property Value

Type	Description
DataGridCell	The view of the current cell.

CurrentCellIndex

Gets the index of the current cell.

Declaration

public RowColumnIndex CurrentCellIndex { get; set; }

Property Value

Type
RowColumnIndex

CurrentCellRendererElement

Gets the view of the current cell element.

Declaration

public View CurrentCellRendererElement { get; }

Property Value

Type
Microsoft.Maui.Controls.View

DataGrid

Gets the SfDataGrid

Declaration

public SfDataGrid DataGrid { get; set; }

Property Value

Type
SfDataGrid

HasCurrentCellState

Gets a value indicating whether the cell state for the current cell has been set.

Declaration

public bool HasCurrentCellState { get; }

Property Value

Type	Description
System.Boolean	True if the cell state for the current cell is set, otherwise false.

IsEditable

ToDo

Declaration

public bool IsEditable { get; set; }

Property Value

Type
System.Boolean

IsFocusable

Gets or sets a value indicating whether the grid cell is focusable.

Declaration

public bool IsFocusable { get; set; }

Property Value

Type	Description
System.Boolean	True if the current cell is focusable, otherwise false. The default value is true.

IsInEditing

Gets or sets a value indicating whether the current cell is in editing.

Declaration

public bool IsInEditing { get; set; }

Property Value

Type
System.Boolean

SupportsRenderOptimization

Gets or sets a value indicating whether the renderer supports rendering itself directly to the drawing context. When this is possible the UIElement will only be created when the user moves the mouse over the cell or if the UIElement is needed for other reasons, e.g. animate after change. The benefit of rendering directly to the DrawingContext instead of creating the UIElement is a much improved scrolling performance.

Declaration

public bool SupportsRenderOptimization { get; set; }

Property Value

Type	Description
System.Boolean	True if the renderer supports optimization, otherwise false. The default value is true.

Methods

BeginEdit(RowColumnIndex, DataGridCell, DataGridColumn, Object)

This method fires when editing in the current cell begins.

Declaration

public virtual bool BeginEdit(RowColumnIndex rowColumnIndex, DataGridCell cellElement, DataGridColumn column, object rowData)

Parameters

Type	Name	Description
RowColumnIndex	rowColumnIndex	The row column index of the cell which is in edit mode.
DataGridCell	cellElement	The UIElement of the cell which is in edit mode.
DataGridColumn	column	The corresponding grid column of the cell which is in edit mode.
System.Object	rowData	The corresponding record of the row which is in edit mode.

Returns

Type	Description
System.Boolean	Returns a value indicating whether the cell enters into the editing mode or not.

CanUpdateBinding(DataColumnBase)

Determines whether the binding for the column can be updated. Implement this method to update binding on particular renderer when the data context is set.

Declaration

public virtual bool CanUpdateBinding(DataColumnBase dataColumnBase)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumnBase	The corresponding column for which the binding update should be determined.

Returns

Type	Description
System.Boolean	True if the binding is updated for the column, otherwise false.

ClearRecycleBin()

Clears the recycle bin. The cell element will be stored for recycling purpose, when the cell element is scrolled out of view. This method clears all the cell elements which are stored for recycling purpose.

Declaration

public void ClearRecycleBin()

CommitCellValue(Boolean)

Commits the edited value to the underlying data.

Declaration

public virtual void CommitCellValue(bool isNewValue)

Parameters

Type	Name	Description
System.Boolean	isNewValue	A value indicating whether the edited value is new value.

Dispose()

Disposes the cell renderer and its elements.

Declaration

public void Dispose()

Dispose(Boolean)

Releases the unmanaged resources used by the component and optionally releases the managed resources

Declaration

protected virtual void Dispose(bool disposing)

Parameters

Type	Name	Description
System.Boolean	disposing

EndEdit(DataColumnBase, Object, Boolean)

This method fires when the editing in the current cell is ended.

Declaration

public virtual bool EndEdit(DataColumnBase dataColumn, object record, bool canResetBinding = false)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn	The corresponding data column of the cell, which leaves the edit mode.
System.Object	record	The underlying data of the cell, which leaves the edit mode.
System.Boolean	canResetBinding	The value indicating whether to reset the binding or not.

Returns

Type	Description
System.Boolean	A boolean value indicating whether the current cell has focus.

GetControlValue()

Returns the current cell value, only if the renderer's HasCurrentCellState is true.

Declaration

public virtual object GetControlValue()

Returns

Type	Description
System.Object	The current cell value.

OnCreateDisplayUIView()

Creates the view for the display UI.

Declaration

protected virtual T1 OnCreateDisplayUIView()

Returns

Type
T1

OnCreateEditUIView()

Creates a new view for the edit mode of cell.

Declaration

protected virtual T2 OnCreateEditUIView()

Returns

Type	Description
T2	Returns the new view for edit mode of cell.

OnEnteredEditMode(DataColumnBase, View)

Invoked when the cell is being entered on the edit mode.

Declaration

protected virtual void OnEnteredEditMode(DataColumnBase dataColumn, View currentRendererElement)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn	The corresponding data column being entered on the edit mode.
Microsoft.Maui.Controls.View	currentRendererElement	The corresponding renderer element in edit mode.

OnInitializeDisplayView(DataColumnBase, T1)

Initializes settings of the display view.

Declaration

protected virtual void OnInitializeDisplayView(DataColumnBase dataColumn, T1 view)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn
T1	view

OnInitializeEditView(DataColumnBase, T2)

Initializes the edit column element of a Syncfusion.Maui.DataGrid.DataColumn object with the given view and required values.

Declaration

public virtual void OnInitializeEditView(DataColumnBase dataColumn, T2 view)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn	The data column containing the details of the column.
T2	view	The child view to be hosted inside the column element.

OnPrepareViews(DataColumnBase)

Prepares the view for the display for the reusing while virtualization.

Declaration

protected virtual DataGridCell OnPrepareViews(DataColumnBase dataColumn)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn

Returns

Type
DataGridCell

OnSetCellStyle(DataColumnBase)

Called when the cell style is set.

Declaration

protected virtual void OnSetCellStyle(DataColumnBase dataColumn)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn

OnUnloadViews(DataColumnBase)

Called from UnloadViews(DataColumnBase) after a cell is scrolled out of view. VirtualizingCellRendererBase overrides this method and either removes the cell renderer visuals from the parent canvas or hide them and reuse it later in same canvas depending on whether GridVirtualizingCellRendererBase.AllowRecycle was set.

Declaration

protected virtual void OnUnloadViews(DataColumnBase dataColumn)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn	The DataColumn containing the details of the column.

OnUpdateCellValue(DataColumnBase)

Called when the cell value is updated.

Declaration

protected virtual void OnUpdateCellValue(DataColumnBase dataColumn)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn

PrepareViews(DataColumnBase)

ToDo

Declaration

public DataGridCell PrepareViews(DataColumnBase dataColumn)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn

Returns

Type
DataGridCell

RefreshDisplayValue(DataColumnBase)

ToDo

Declaration

public void RefreshDisplayValue(DataColumnBase dataColumn)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn

ResetCurrentCellState()

Resets the current cell information in renderer, when the current cell is deactivated.

Declaration

public void ResetCurrentCellState()

ResumeBinding(DataColumnBase, T1)

Resumes the binding value.

Declaration

protected virtual void ResumeBinding(DataColumnBase dataColumn, T1 view)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn	DataColumnBase instance.
T1	view	current view.

SetCellStyle(DataColumnBase)

Called when set the cell style

Declaration

public void SetCellStyle(DataColumnBase dataColumn)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn

SetControlValue(Object)

Set the current cell value, only if the renderer's HasCurrentCellState is true.

Declaration

public virtual void SetControlValue(object value)

Parameters

Type	Name	Description
System.Object	value	The value to be set to the current cell.

SetCurrentCellState(RowColumnIndex, DataGridCell, Boolean)

Update the current cell information in the renderer while current cell was activated.

Declaration

public void SetCurrentCellState(RowColumnIndex currentCellIndex, DataGridCell currentCellElement, bool isInEditing)

Parameters

Type	Name	Description
RowColumnIndex	currentCellIndex	The row column index of the current cell.
DataGridCell	currentCellElement	The UIElement of the current cell.
System.Boolean	isInEditing	The value indicating whether the view is in edit mode or not.

SetFocus(View, Boolean)

Sets the focus for the editing view.

Declaration

protected virtual void SetFocus(View view, bool needToFocus)

Parameters

Type	Name	Description
Microsoft.Maui.Controls.View	view	Current cell renderer element.
System.Boolean	needToFocus	Returns whether focus has to be set or not.

SetFocus(Boolean)

Sets the focus to the current cell renderer element.

Declaration

public void SetFocus(bool setFocus)

Parameters

Type	Name	Description
System.Boolean	setFocus	The value indicating whether the current cell renderer element is focusable or not.

SuspendBinding(DataColumnBase, T1)

Suspends the binding value.

Declaration

protected virtual void SuspendBinding(DataColumnBase dataColumn, T1 view)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn	DataColumnBase instance.
T1	view	current view.

UnloadViews(DataColumnBase)

ToDo

Declaration

public void UnloadViews(DataColumnBase dataColumn)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn

UnwireEditUIElement(T2)

Unwire the edit element to the view.

Declaration

protected virtual void UnwireEditUIElement(T2 editElement)

Parameters

Type	Name	Description
T2	editElement	The edit element .

UpdateCellValue(DataColumnBase)

ToDo

Declaration

public void UpdateCellValue(DataColumnBase dataColumn)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn

UpdateColumnInfo(DataColumnBase)

ToDo

Declaration

public void UpdateColumnInfo(DataColumnBase dataColumn)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn

UpdateCurrentCellState(View, Boolean)

Updates the current cell state for the specified current cell renderer element.

Declaration

protected void UpdateCurrentCellState(View currentRendererElement, bool isInEdit)

Parameters

Type	Name	Description
Microsoft.Maui.Controls.View	currentRendererElement	Specifies the current cell UIElement to update the current cell state.
System.Boolean	isInEdit	Specifies whether the current cell is editable.

UpdateEditViewCellStyle(DataColumnBase, T2)

ToDo

Declaration

protected virtual void UpdateEditViewCellStyle(DataColumnBase dataColumn, T2 editView)

Parameters

Type	Name	Description
Syncfusion.Maui.DataGrid.DataColumnBase	dataColumn
T2	editView

WireEditUIElement(T2)

Wires the edit element to the view.

Declaration

protected virtual void WireEditUIElement(T2 editElement)

Parameters

Type	Name	Description
T2	editElement	The edit element.

Implements

IDataGridCellRenderer

System.IDisposable