Class GridCellRendererBase

This is a base class for the renderer part of a cell type.

Inheritance

System.Object

NonFinalizeDisposable

GridCellRendererBase

XhtmlCellRenderer

GridCheckBoxCellRenderer

GridDataBoundRowExpandCellRenderer

GridPushButtonCellRenderer

GridRichTextBoxCellRenderer

GridStaticCellRenderer

GridTableIndentCellRenderer

PivotRowExpandCellRenderer

Implements

System.IDisposable

Inherited Members

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

Namespace: Syncfusion.Windows.Forms.Grid

Assembly: Syncfusion.Grid.Windows.dll

Syntax

public class GridCellRendererBase : NonFinalizeDisposable, IQueryFocusInside, IGridDropDownCell, IPopupParent, IPopupItem, IDisposable

Remarks

A renderer is created for each GridCellModelBase and GridControlBase. There can be several renderers associated with one GridCellModelBase if several views display the same GridModel.

You typically access cell renderers through the CellRenderers property of the GridControlBase class.

Constructors

GridCellRendererBase(GridControlBase, GridCellModelBase)

Initializes a new instance of the GridCellRendererBase class for the given GridControlBase and GridCellModelBase

Declaration

public GridCellRendererBase(GridControlBase grid, GridCellModelBase cellModel)

Parameters

Type	Name	Description
GridControlBase	grid	The GridControlBase that displays this cell renderer.
GridCellModelBase	cellModel	The GridCellModelBase that holds data for this cell renderer that should be shared among views.

Remarks

References to GridControlBase, and GridCellModelBase will be saved.

Properties

AlwaysRaiseCellClick

Gets or sets a value indicating whether a CellClick event should always be raised. If this property is false, it depends on Clickable if CellClick is raised.

Declaration

public bool AlwaysRaiseCellClick { get; set; }

Property Value

Type
System.Boolean

ClickOverImage

Gets or sets a value indicating whether the mouse was over an image (see ImageIndex) in static cell when the mouse was released.

Declaration

protected bool ClickOverImage { get; set; }

Property Value

Type
System.Boolean

ColIndex

Gets or sets the column id of the current cell.

Declaration

public int ColIndex { get; set; }

Property Value

Type
System.Int32

Remarks

This value is only valid if GridControlBase::Init has been called and intrinsic state is initialized; if the control is currently not used as current cell, the value is undetermined.

Control

Gets a reference to the associated control. If no control is associated with the cell type, NULL will be returned.

Declaration

public Control Control { get; }

Property Value

Type	Description
System.Windows.Forms.Control	Reference to the associated control. Can be NULL.

ControlText

Gets or sets the active text that is displayed for the current cell, e.g. TextBox.Text.

Declaration

public virtual string ControlText { get; set; }

Property Value

Type
System.String

ControlValue

Gets or sets the cell value for the current cell.

Declaration

public virtual object ControlValue { get; set; }

Property Value

Type
System.Object

CurrentCell

Gets a reference to GridCurrentCell implementation of the GridControlBase this cell renderer is associated with.

Declaration

public GridCurrentCell CurrentCell { get; }

Property Value

Type
GridCurrentCell

CurrentStyle

Gets the current view style for the current cell.

Declaration

public GridStyleInfo CurrentStyle { get; }

Property Value

Type
GridStyleInfo

DropDownButton

Gets or sets the drop-down button.

Declaration

public GridCellButton DropDownButton { get; set; }

Property Value

Type
GridCellButton

DropDownContainer

Gets the container where you can insert child controls to be displayed as drop-down part for your cell.

Declaration

public IGridDropDownContainer DropDownContainer { get; }

Property Value

Type
IGridDropDownContainer

DropDownImp

Gets or sets a helper object for drop-down cell functionality.

Declaration

public IGridDropDownCellImp DropDownImp { get; set; }

Property Value

Type
IGridDropDownCellImp

DropDownPart

Gets or sets the IGridDropDownCellImp that provides drop-down logic for this renderer.

Declaration

public IGridDropDownCellImp DropDownPart { get; set; }

Property Value

Type
IGridDropDownCellImp

ForceRefreshOnActivateCell

Gets or sets a value indicating whether your control needs to be refreshed when it becomes the current cell in the grid.

Declaration

public bool ForceRefreshOnActivateCell { get; set; }

Property Value

Type
System.Boolean

Remarks

If you set this attribute to be true, some grid internal optimizations with outlining the current cell are turned off. These optimizations assume that the style of a cell does not change when it has become the current cell. If your control's appearance depends on whether it is a current cell or not, you should set this attribute True ( default is False). For example, if you have a password control which should be drawn with plain text only when it is the current cell, you may set the ForceRefreshOnActivateCell attribute of the specific control to be true.

Grid

Gets a reference to the parent grid.

Declaration

public GridControlBase Grid { get; }

Property Value

Type
GridControlBase

HasControlText

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

Declaration

public bool HasControlText { get; }

Property Value

Type
System.Boolean

HasControlValue

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

Declaration

public bool HasControlValue { get; }

Property Value

Type
System.Boolean

HasFocusControl

Gets a value indicating whether the cell renderer has the focus (is in-place edit mode).

Declaration

public bool HasFocusControl { get; }

Property Value

Type
System.Boolean

InBeginEdit

Gets a value indicating whether OnBeginEdit() was called.

Declaration

public bool InBeginEdit { get; }

Property Value

Type
System.Boolean

InInitialize

Gets a value indicating whether is in initialize method. True while in initialize method.

Declaration

protected bool InInitialize { get; }

Property Value

Type
System.Boolean

Initalized

Gets a value indicating whether this cell type serves as current cell or if the current cell is at the specified row and column id.

Declaration

public bool Initalized { get; }

Property Value

Type	Description
System.Boolean	True if control is used as current cell; False if control is not current cell.

InSetControlText

Gets a value indicating whether ControlText setter was called. True when ControlText setter was called.

Declaration

public bool InSetControlText { get; }

Property Value

Type
System.Boolean

InSetControlValue

Gets a value indicating whether the ControlValue setter was called. True if ControlValue setter was called.

Declaration

public bool InSetControlValue { get; }

Property Value

Type
System.Boolean

InSetSetControlValue

Gets a value indicating whether SetControlValue(Object, Boolean) method was called. True when SetControlValue(Object, Boolean) method was called.

Declaration

public bool InSetSetControlValue { get; }

Property Value

Type
System.Boolean

IsDisposed

Gets a value indicating whether object has been disposed.

Declaration

public bool IsDisposed { get; }

Property Value

Type
System.Boolean

IsDisposing

Gets a value indicating whether object is executing Dispose() method call. Returns true if object is executing Dispose() method call.

Declaration

public bool IsDisposing { get; }

Property Value

Type
System.Boolean

IsDroppedDown

Gets a value indicating whether the current cell is in a dropped-down state.

Declaration

protected virtual bool IsDroppedDown { get; }

Property Value

Type
System.Boolean

IsEditing

Gets a value indicating whether BeginEdit has been called.

Declaration

protected bool IsEditing { get; }

Property Value

Type
System.Boolean

Model

Gets or sets a reference to the GridCellModelBase that this cell renderer is associated with.

Declaration

public GridCellModelBase Model { get; set; }

Property Value

Type
GridCellModelBase

MouseDownPoint

Gets or sets the cached mouse position of the last MouseDown event.

Declaration

protected Point MouseDownPoint { get; set; }

Property Value

Type
System.Drawing.Point

MouseDownTick

Gets or sets the cached Environment.TickCount of the last MouseDown event.

Declaration

protected int MouseDownTick { get; set; }

Property Value

Type
System.Int32

RowIndex

Gets or sets the row id of the current cell.

Declaration

public int RowIndex { get; set; }

Property Value

Type
System.Int32

Remarks

This value is only valid if GridControlBase::Init has been called and an intrinsic state is initialized; if the control is currently not used as current cell, the value is undetermined.

ScaleFactor

Gets the scale factor based on current DPI.

Declaration

protected float ScaleFactor { get; }

Property Value

Type
System.Single

StyleInfo

Gets a reference to the style object associated with the current cell.

Declaration

public GridStyleInfo StyleInfo { get; }

Property Value

Type
GridStyleInfo

SupportsEditing

Gets or sets a value indicating whether the cell renderer supports being switched into edit mode. Default is true, only for GridStaticCellRenderer and GridHeaderCellRenderer it is false.

Declaration

public bool SupportsEditing { get; set; }

Property Value

Type
System.Boolean

SupportsFocusControl

Gets or sets a value indicating whether the cell renderer supports in-place editing with focus

Declaration

public bool SupportsFocusControl { get; set; }

Property Value

Type
System.Boolean

Methods

AddButton(GridCellButton)

Adds a GridCellButton to the cell renderers list of cell buttons.

Declaration

protected void AddButton(GridCellButton button)

Parameters

Type	Name	Description
GridCellButton	button	The GridCellButton to add.

CanCopy()

Determines whether current cell can be copied to clipboard.

Declaration

public virtual bool CanCopy()

Returns

Type	Description
System.Boolean	True if copy is supported; otherwise False.

CanCut()

Determines whether current cell can be cut to clipboard.

Declaration

public virtual bool CanCut()

Returns

Type	Description
System.Boolean	True if cut is supported; otherwise False.

CanPaste()

Determines whether current cell can be pasted from clipboard.

Declaration

public virtual bool CanPaste()

Returns

Type	Description
System.Boolean	True if paste is supported; otherwise False.

ChildClosing(IPopupChild, PopupCloseType)

Will be called to indicate that the popup child was closed in the specified mode.

Declaration

public virtual void ChildClosing(IPopupChild childUI, PopupCloseType popupCloseType)

Parameters

Type	Name	Description
IPopupChild	childUI	The child that was closed.
PopupCloseType	popupCloseType	A PopupCloseType value.

ControlDoubleClick(Object, EventArgs)

Handles the DoubleClick event of the embedded control and raises the CurrentCellControlDoubleClick event.

Declaration

protected virtual void ControlDoubleClick(object sender, EventArgs e)

Parameters

Type	Name	Description
System.Object	sender	The source of the event.
System.EventArgs	e	Event data.

ControlGotFocus(Object, EventArgs)

Handles the GotFocus event of the embedded control and raises the CurrentCellControlGotFocus event.

Declaration

protected virtual void ControlGotFocus(object sender, EventArgs e)

Parameters

Type	Name	Description
System.Object	sender	The source of the event.
System.EventArgs	e	An System.EventArgs that contains event data.

ControlLostFocus(Object, EventArgs)

Handles the LostFocus event of the embedded control and raises the CurrentCellControlLostFocus event.

Declaration

protected virtual void ControlLostFocus(object sender, EventArgs e)

Parameters

Type	Name	Description
System.Object	sender	The source of the event.
System.EventArgs	e	An System.EventArgs that contains event data.

ControlMouseDown(Object, MouseEventArgs)

Handles the Control.MouseDown event of the attached cell control.

Declaration

protected void ControlMouseDown(object sender, MouseEventArgs e)

Parameters

Type	Name	Description
System.Object	sender	Source of the event.
System.Windows.Forms.MouseEventArgs	e	The MouseEventArgs with mouse position relative to top-left corner of cell.

Copy()

Called when user initiates a clipboard copy and the grid has a current cell but no range is selected.

Declaration

public virtual bool Copy()

Returns

Type	Description
System.Boolean	True if successful; False if failed.

Remarks

Copy() performs the following tasks:

a) Copy selected text as formatted in the cell.

b) Only if cell is inactive copy the GridStyleInfo info for the cell.

CreateDropDownContainer()

Creates a GridDropDownContainer and associates it with the cell's parent grid.

Declaration

protected virtual IGridDropDownContainer CreateDropDownContainer()

Returns

Type	Description
IGridDropDownContainer	The container where you can insert child controls to be displayed as drop-down part for your cell.

Cut()

Called when user initiates a clipboard cut and the grid has a current cell but no range is selected.

Declaration

public virtual bool Cut()

Returns

Type	Description
System.Boolean	True if successful; False if failed.

Dispose()

Releases the all resources used by the component.

Declaration

public void Dispose()

Dispose(Boolean)

Unwire any events subscribed from GridControlBase and releases cell buttons.

Declaration

protected override void Dispose(bool disposing)

Parameters

Type	Name	Description
System.Boolean	disposing	true to release both managed and unmanaged resources; false to release only unmanaged resources.

Overrides

NonFinalizeDisposable.Dispose(Boolean)

Remarks

See the documentation for the System.ComponentModel.Component class and its Dispose member.

Draw(Graphics, Rectangle, Int32, Int32, GridStyleInfo)

Draw the contents of the specified cell.

Declaration

public virtual void Draw(Graphics g, Rectangle cellRectangle, int rowIndex, int colIndex, GridStyleInfo style)

Parameters

Type	Name	Description
System.Drawing.Graphics	g	Points to the device context.
System.Drawing.Rectangle	cellRectangle	Specifies the cell rectangle.
System.Int32	rowIndex	Specifies the row id.
System.Int32	colIndex	Specifies the column id.
GridStyleInfo	style	A reference to the style of the cell.

Remarks

When drawing cells, it is necessary to determine if the specified cell (with rowIndex and colIndex) is the current cell and if it is active.

If your control is associated with a control and supports in-place editing and the specified cell is the current cell, you should position the control. Take a look at the GridTextBoxCellRenderer implementation of this method for an example.

Otherwise, you can simply draw the cell.

Please note that you should first call DrawBackground to draw the background and borders as specified in the style object.

The base-class version of this method first calls PerformLayout and then the cell renderers OnDraw method. After the inner cell has been drawn, it will draw each cell button for the cell.

note

Overriding this method is normally not necessary. In most cases, it is sufficient to override the OnDraw method.

DrawBackground(Graphics, Rectangle, GridStyleInfo, Boolean)

Checks if the background for a cell needs drawing and optionally calls OnDrawCellBackground(GridDrawCellBackgroundEventArgs) and also draws the frame for the cell as specified in the style object.

Declaration

protected virtual void DrawBackground(Graphics g, Rectangle rect, GridStyleInfo style, bool fillBackground)

Parameters

Type	Name	Description
System.Drawing.Graphics	g	The System.Drawing.Graphics context of the canvas.
System.Drawing.Rectangle	rect	The Rectangle
GridStyleInfo	style	The GridStyleInfo object that holds cell information.
System.Boolean	fillBackground	True if background needs to be redrawn.

Remarks

The method will call OnDrawCellBackground(GridDrawCellBackgroundEventArgs) for covered cells and bannered cells. For regular cells, you can force OnDrawCellBackground(GridDrawCellBackgroundEventArgs) to be called by assigning BrushInfo.Empty to the Interior property of a GridStyleInfo. You can do this in OnPrepareViewStyleInfo(GridPrepareViewStyleInfoEventArgs), for example.

Otherwise OnDrawCellBackground(GridDrawCellBackgroundEventArgs) will not be called for regular cells because of internal drawing optimizations within the grid. By default the grid optimizes drawing such that the background of neighboring cells with the same color is drawn in one operation.

After the background of a cell has been drawn (either by a call to OnDrawCellBackground(GridDrawCellBackgroundEventArgs) or because of earlier drawing inside the grid) the cells frame is drawn as specified with CellAppearance by calling DrawCellAppearance(Graphics, Rectangle, GridStyleInfo).

DrawCellAppearance(Graphics, Rectangle, GridStyleInfo)

Draws the frame for the cells appearance (sunken or raised).

Declaration

protected virtual void DrawCellAppearance(Graphics g, Rectangle rect, GridStyleInfo style)

Parameters

Type	Name	Description
System.Drawing.Graphics	g	The System.Drawing.Graphics context of the canvas.
System.Drawing.Rectangle	rect	The System.Drawing.Rectangle with the bounds.
GridStyleInfo	style	The GridStyleInfo object that holds cell information.

Remarks

If you want to draw custom borders around a cell, be sure to reserve space for the extra area occupied by your borders. See BorderMargins.

DrawSingleCell(Graphics, Rectangle, Int32, Int32, GridStyleInfo, Boolean)

Draw the contents of the specified cell including cell background and optionally also the borders. Call this method if you want to draw a stand-alone cell and you want to ensure that also the background of the cell and also the borders are painted.

Declaration

public void DrawSingleCell(Graphics g, Rectangle cellRectangle, int rowIndex, int colIndex, GridStyleInfo style, bool includeBorders)

Parameters

Type	Name	Description
System.Drawing.Graphics	g	Points to the device context.
System.Drawing.Rectangle	cellRectangle	Specifies the cell rectangle.
System.Int32	rowIndex	Specifies the row id.
System.Int32	colIndex	Specifies the column id.
GridStyleInfo	style	A reference to the style of the cell.
System.Boolean	includeBorders	Specifies whether borders should also be drawn or excluded.

Remarks

The method calls DrawBackground to draw the background as specified in the style object.

If includeBorders is false the area covered by borders is excluded when the rectangle is passed to the DrawBackground method.

DropDownContainerCloseDropDown(Object, PopupClosedEventArgs)

Will be called to indicate that the popup child was closed.

Declaration

public virtual void DropDownContainerCloseDropDown(object sender, PopupClosedEventArgs e)

Parameters

Type	Name	Description
System.Object	sender	The child that was closed.
PopupClosedEventArgs	e	The event data with a PopupCloseType value.

DropDownContainerShowedDropDown(Object, EventArgs)

Occurs after the popup has been dropped-down and made visible.

Declaration

public virtual void DropDownContainerShowedDropDown(object sender, EventArgs e)

Parameters

Type	Name	Description
System.Object	sender	The source of the event.
System.EventArgs	e	Event data.

DropDownContainerShowingDropDown(Object, CancelEventArgs)

Occurs when the drop-down container is about to be shown.

Declaration

public virtual void DropDownContainerShowingDropDown(object sender, CancelEventArgs e)

Parameters

Type	Name	Description
System.Object	sender	The source of the event.
System.ComponentModel.CancelEventArgs	e	Event data.

EnsureDropDownContainer()

Ensures the container is valid and initialized.

Declaration

public void EnsureDropDownContainer()

FindText(String, Int32, Int32, GridFindTextOptions, Boolean)

Searches the specified text and optionally moves the current cell to the cell if the text was found.

Declaration

public virtual bool FindText(string find, int rowIndex, int colIndex, GridFindTextOptions options, bool bSetCell)

Parameters

Type	Name	Description
System.String	find	The text to be searched.
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
GridFindTextOptions	options	Search criteria.
System.Boolean	bSetCell	True if current cell should be moved after text was found.

Returns

Type	Description
System.Boolean	True if text was found; False otherwise.

GetButton(Int32)

Returns a reference to the GridCellButton at the specified index.

Declaration

protected GridCellButton GetButton(int index)

Parameters

Type	Name	Description
System.Int32	index	The index of the GridCellButton.

Returns

Type	Description
GridCellButton	The GridCellButton at the index.

GetCellBoundsCore(Int32, Int32)

Returns a rectangle with cell bounds for the specified cell. For covered cell, the total of all covered cells will be returned.

Declaration

public Rectangle GetCellBoundsCore(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.

Returns

Type	Description
System.Drawing.Rectangle	The System.Drawing.Rectangle with the bounds.

GetCellBoundsCore(Int32, Int32, Boolean)

Returns a rectangle with cell bounds for the specified cell. For covered cell, the total of all covered cells will be returned.

Declaration

public Rectangle GetCellBoundsCore(int rowIndex, int colIndex, bool includeFloated)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Boolean	includeFloated	Specifies if the range covered by a floating cell should be returned

Returns

Type	Description
System.Drawing.Rectangle	The System.Drawing.Rectangle with the bounds.

GetCellBoundsCoreInt(Int32, Int32, Boolean)

For internal use.

Declaration

public Rectangle GetCellBoundsCoreInt(int rowIndex, int colIndex, bool nonClientIfVisible)

Parameters

Type	Name	Description
System.Int32	rowIndex	Index of the row.
System.Int32	colIndex	Index of the col.
System.Boolean	nonClientIfVisible	if set to `true` [non client if visible].

Returns

Type	Description
System.Drawing.Rectangle	returns Rectangle

GetCellClientRectangle(Int32, Int32, GridStyleInfo, Boolean)

Declaration

public Rectangle GetCellClientRectangle(int rowIndex, int colIndex, GridStyleInfo style, bool floatedCells)

Parameters

Type	Name	Description
System.Int32	rowIndex
System.Int32	colIndex
GridStyleInfo	style
System.Boolean	floatedCells

Returns

Type
System.Drawing.Rectangle

GetCellLayout(Int32, Int32, GridStyleInfo)

Declaration

public GridCellLayout GetCellLayout(int rowIndex, int colIndex, GridStyleInfo style)

Parameters

Type	Name	Description
System.Int32	rowIndex
System.Int32	colIndex
GridStyleInfo	style

Returns

Type
GridCellLayout

GetCellText(GridStyleInfo, GridFindTextOptions)

Get the text of particular cell

Declaration

protected virtual string GetCellText(GridStyleInfo style, GridFindTextOptions options)

Parameters

Type	Name	Description
GridStyleInfo	style	style of the cell
GridFindTextOptions	options	GridFindTextOptions

Returns

Type	Description
System.String	Text

GetCellValue()

Returns ControlValue.

Declaration

public virtual object GetCellValue()

Returns

Type	Description
System.Object	Cell value.

GetDisplayText()

Returns ControlText.

Declaration

public virtual string GetDisplayText()

Returns

Type	Description
System.String	Display text.

GetEditState()

Returns state information that lets you restore the current editing state (e.g. caret position or other cell-type specific information) at a later point with SetEditState(Object).

Declaration

public virtual object GetEditState()

Returns

Type	Description
System.Object	A cell-type specific object with editing state information.

Remarks

You need to override this method in a derived cell-type class. Otherwise calling this method will have no effect.

Examples

This example shows how to get the edit state of the cell.

//Scroll position based on the column index.
public override object GetEditState()
{
    if (this.gridControl1.CurrentCell.IsEditing)
    {
        return new int[] { 0, this.gridControl1[this.gridControl1.CurrentCell.RowIndex,this.gridControl1.CurrentCell.ColIndex].Text.Length };
    }
    return null;
}

Public Overrides Function GetEditState() As Object
    If Me.gridControl1.CurrentCell.IsEditing Then
        Return New Integer(){ 0, Me.gridControl1(Me.gridControl1.CurrentCell.RowIndex, Me.gridControl1.CurrentCell.ColIndex).Text.Length }
    End If
    Return Nothing
End Function

GetMarkHeaderState(Int32, Int32, GridStyleInfo)

Checks if this is a header cell that should indicate current cell position.

Declaration

protected virtual bool GetMarkHeaderState(int rowIndex, int colIndex, GridStyleInfo style)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
GridStyleInfo	style	The GridStyleInfo object that holds cell information.

Returns

Type	Description
System.Boolean	True if header shall be outlined; False otherwise.

GetNestedCurrentCell()

Returns a nested current cell if this cell type hosts a GridControl by itself (for example GridNestedTableControlCellRenderer with a GridGroupingControl overrides this method).

Declaration

public virtual GridCurrentCell GetNestedCurrentCell()

Returns

Type	Description
GridCurrentCell	A nested current cell object.

GetSelectedText(out String)

Return the selected text in the current cell.

Declaration

public virtual bool GetSelectedText(out string strResult)

Parameters

Type	Name	Description
System.String	strResult	The resulting string with the selected text

Returns

Type	Description
System.Boolean	True if successful; False if failed.

Hide()

If there is a control associated with the cell type (for in-place editing), override this method to hide the control.

Declaration

public virtual void Hide()

InitalizedAt(Int32, Int32)

Determines whether this cell type serves as current cell or if the current cell is at the specified row and column id.

Declaration

[Obsolete("Use InitializedAt method instead")]
public bool InitalizedAt(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.

Returns

Type	Description
System.Boolean	True if control is used as current cell; False if control is not current cell.

Initialize(Int32, Int32)

Initializes the intrinsic state of the control for the current cell.

Declaration

public void Initialize(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	Specifies the row id.
System.Int32	colIndex	Specifies the column id.

Remarks

Initializes the intrinsic state (e.g., row, column, style) of the control for the current cell. This method is called when the current cell has moved. The operations that follow all depend on the intrinsic state of the control.

Initialize calculates the cell layout (inner, client rectangle bounds) and then calls OnInitialize.

InitializeControlText(Object)

Initializes ControlText based on the specified cell value.

Declaration

protected virtual void InitializeControlText(object controlValue)

Parameters

Type	Name	Description
System.Object	controlValue	The cell value. See the CellValue of the GridStyleInfo class.

Remarks

The default behavior of this method is to call GetFormattedText(Object) of the StyleInfo object and then raise a CurrentCellInitializeControlText event.

The user can catch the event and change the ControlText property of the GridCurrentCellInitializeControlTextEventArgs object.

InitializedAt(Int32, Int32)

Determines whether this cell type serves as current cell or if the current cell is at the specified row and column id.

Declaration

public bool InitializedAt(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.

Returns

Type	Description
System.Boolean	True if control is used as current cell; False if control is not current cell.

InitializeDropDownContainer()

Called to initialize contents of the drop-down container for the first time.

Declaration

protected virtual void InitializeDropDownContainer()

IsControlVisible()

Determines if there is a control associated with the cell type (for in-place editing) and if it is visible.

Declaration

public virtual bool IsControlVisible()

Returns

Type	Description
System.Boolean	True if it is visible; False otherwise.

IsPointOverImage(Int32, Int32, Point)

Checks if the specified point is over an image (see ImageIndex) .

Declaration

protected virtual bool IsPointOverImage(int rowIndex, int colIndex, Point pt)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Drawing.Point	pt	The point to be tested.

Returns

Type	Description
System.Boolean	True if inside image; False otherwise.

IsReadOnly()

Returns whether the current cell is Read-only.

Declaration

public virtual bool IsReadOnly()

Returns

Type	Description
System.Boolean	True if Read-only; False otherwise.

IsRelatedControl(Control, Boolean)

Called to find out whether a specified control is part of the popup hierarchy.

Declaration

public virtual bool IsRelatedControl(Control control, bool askPopupParent)

Parameters

Type	Name	Description
System.Windows.Forms.Control	control	A control instance.
System.Boolean	askPopupParent	True indicates this query should be passed to the IPopupParent, if any; False indicates you should not query the popup parent.

Returns

Type	Description
System.Boolean	True if the control is part of the popup hierarchy; False if not.

NotifyCurrentCellChanged()

Raises the GridCurrentCell.CellChanged event indicating the contents of the current cell have been changed (e.g. in response to a TextBox.Changed event).

Declaration

protected virtual void NotifyCurrentCellChanged()

Remarks

If you have implemented a custom cell type you should call this method from your derived renderer if you support modifying the cell contents.

NotifyCurrentCellChanging()

Raises the GridCurrentCell.CellChanging event indicating the contents of the current cell are about to be changed by the user.

Declaration

protected virtual bool NotifyCurrentCellChanging()

Returns

Type	Description
System.Boolean	True if cell contents can be modified; False if cell contents should not be changed.

Remarks

Call this method from your derived renderer if you support modifying the cell contents the first time before the user edits the cell.

NotifyCurrentCellControlDoubleClick(Control)

Raises the GridCurrentCell.ControlDoubleClick event indicating the cell has in-place editing mode and the user double-clicked inside the control associated with the current cell.

Declaration

protected void NotifyCurrentCellControlDoubleClick(Control control)

Parameters

Type	Name	Description
System.Windows.Forms.Control	control	A reference to the control associated with the current cell.

Remarks

GridCurrentCell.ControlDoubleClick lets you detect a double click inside a cell for any CurrentCellActivateBehavior. If for example the focus is set to the renderers control after the first click, the grid will listen for a MouseDown on the newly focused control and raise this event on a second click.

NotifyCurrentCellControlGotFocus(Control)

Raises the GridCurrentCell.ControlGotFocus event indicating the cell has switched to in-place editing and the control associated with the current cell has received the focus.

Declaration

protected void NotifyCurrentCellControlGotFocus(Control control)

Parameters

Type	Name	Description
System.Windows.Forms.Control	control	A reference to the control associated with the current cell.

Remarks

No derived renderer currently calls this method.

NotifyCurrentCellControlLostFocus(Control)

Raises the GridCurrentCell.ControlLostFocus event indicating the cell has switched to in-place editing and the control associated with the current cell has lost the focus.

Declaration

protected void NotifyCurrentCellControlLostFocus(Control control)

Parameters

Type	Name	Description
System.Windows.Forms.Control	control	Control associated with the current cell.

Remarks

No derived renderer currently calls this method.

NotifyShowedDropDown()

Raises the OnCurrentCellShowedDropDown(EventArgs) for the parent grid.

Declaration

protected void NotifyShowedDropDown()

NotifyShowingDropDown(ref Size)

Raises the OnCurrentCellShowingDropDown(GridCurrentCellShowingDropDownEventArgs) for the parent grid.

Declaration

protected bool NotifyShowingDropDown(ref Size size)

Parameters

Type	Name	Description
System.Drawing.Size	size	The suggested size of the drop-down.

Returns

Type	Description
System.Boolean	True if drop-down should be shown; False if operation should be canceled.

OnActivated()

This is called after the activating event and notifies that at this time the current cell has now become the active current cell.

Declaration

protected virtual void OnActivated()

OnActivating(Int32, Int32)

This is called from GridCurrentCell.Activate after the activating event has been raised and allows interception of cell activation.

Declaration

protected virtual bool OnActivating(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.

Returns

Type	Description
System.Boolean	True is cell can be activated; False otherwise.

Remarks

When the current cell is moved from one position to another, Essential Grid will first deactivate the current cell and afterwards activate the current cell at the new position. At the time activate is called, the old current cell is deactivated and Essential Grid has no active current cell.

OnBeginEdit()

Called from GridCurrentCell.BeginEdit. Checks if cell renderer support in place editing. If in-place editing is supported, Syncfusion.Windows.Forms.Grid.GridCellRendererBase.SetHasFocusControl(System.Boolean) is called which triggers OnHasFocusControlChanged() and initiates repainting the cell. In your overridden OnDraw(Graphics, Rectangle, Int32, Int32, GridStyleInfo) method, you should then check ShouldDrawFocused(Int32, Int32).

Declaration

protected virtual void OnBeginEdit()

OnButtonClicked(Int32, Int32, Int32)

This method is called when the user clicks a cell button inside cell.

Declaration

protected virtual void OnButtonClicked(int rowIndex, int colIndex, int button)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Int32	button	The button

Remarks

In your overridden version of this method, you can activate the current cell for the given row and column index and then drop-down a list.

OnCancelMode(Int32, Int32)

This is called from GridClickCellsMouseController or GridSelectCellsMouseController when your cell renderer has indicated in its OnHitTest override that it wants to receive mouse events and the mouse operation is canceled.

Declaration

protected virtual void OnCancelMode(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.

OnCellLayoutChanged()

Called when the ViewLayout of the parent grid is changed, for example if grid is scrolled or row height is changed.

Declaration

protected virtual void OnCellLayoutChanged()

OnClick(Int32, Int32, MouseEventArgs)

This is called from GridSelectCellsMouseController when the user clicked inside a cell.

Declaration

protected virtual void OnClick(int rowIndex, int colIndex, MouseEventArgs e)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Windows.Forms.MouseEventArgs	e	A System.Windows.Forms.MouseEventArgs with data about the mouse event.

OnCloseDropDown(PopupCloseType)

This is called from GridCurrentCell.CloseDropDown.

Declaration

protected virtual void OnCloseDropDown(PopupCloseType reason)

Parameters

Type	Name	Description
PopupCloseType	reason

Remarks

If your renderer supports dropped-down state, the drop-down window should be made closed at this time.

OnControlDoubleClick(Control)

Occurs when the current cell has in-place editing mode and the user double-clicked inside the control associated with the current cell.

Declaration

protected virtual void OnControlDoubleClick(Control control)

Parameters

Type	Name	Description
System.Windows.Forms.Control	control

Remarks

Raising this event is only optional for the cell renderer that manages the active cell.

A text box will usually send this event when the associated System.Windows.Forms.TextBox control has received the focus after the cell was switched into edit mode and the user double-clicked. Other cell renderers may or may not send this event.

OnDeactivating()

Called from GridCurrentCell.Deactivate after GridCurrentCell.Deactivating event and before the current cell is deactivated.

Declaration

protected virtual bool OnDeactivating()

Returns

Type	Description
System.Boolean	True if renderer can be deactivated; False if deactivation should be aborted.

OnDeactived(Int32, Int32)

Called from GridCurrentCell.Deactivated after the current cell is deactivated and before the GridCurrentCell.Deactivated event.

Declaration

protected virtual void OnDeactived(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex
System.Int32	colIndex

OnDeleting()

Occurs before the text box contents are deleted when user presses key in cell.

Declaration

protected virtual bool OnDeleting()

Returns

Type	Description
System.Boolean	True if cell contents can be cleared.

OnDoubleClick(Int32, Int32, MouseEventArgs)

This is called from GridSelectCellsMouseController when the user double-clicks inside a cell.

Declaration

protected virtual void OnDoubleClick(int rowIndex, int colIndex, MouseEventArgs e)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Windows.Forms.MouseEventArgs	e	A System.Windows.Forms.MouseEventArgs with data about the mouse event.

OnDraw(Graphics, Rectangle, Int32, Int32, GridStyleInfo)

This method is called from the cell renderer's draw method to draw the contents of the client bounds for the cell, e.g. the text for a static cell.

Declaration

protected virtual void OnDraw(Graphics g, Rectangle clientRectangle, int rowIndex, int colIndex, GridStyleInfo style)

Parameters

Type	Name	Description
System.Drawing.Graphics	g	Points to the device context.
System.Drawing.Rectangle	clientRectangle	Specifies the client rectangle. It is the cell rectangle without buttons and borders.
System.Int32	rowIndex	Specifies the row id.
System.Int32	colIndex	Specifies the column id.
GridStyleInfo	style	A reference to the style object of the cell.

Remarks

When drawing cells, it is necessary to determine if the specified cell (with rowIndex and colIndex) is the current cell and if it is active.

Otherwise, you can simply draw the cell.

OnDrawCellBackground(GridDrawCellBackgroundEventArgs)

Called to draw / erase the background for a cell.

Declaration

protected virtual void OnDrawCellBackground(GridDrawCellBackgroundEventArgs e)

Parameters

Type	Name	Description
GridDrawCellBackgroundEventArgs	e	A GridDrawCellBackgroundEventArgs that contains the event data.

Remarks

This method is called for covered cells and bannered cells. For regular cells, you can force OnDrawCellBackground(GridDrawCellBackgroundEventArgs) to be called by assigning BrushInfo.Empty to the Interior property of a GridStyleInfo. You can do this for example in OnPrepareViewStyleInfo(GridPrepareViewStyleInfoEventArgs).

The method will also not be called if you handle the DrawCellBackground event of GridControlBase and set e.Cancel = true.

The default version of this method fills the entire background as specified with Interior and also draws the image specified with BackgroundImage.

OnDrawCellButton(GridCellButton, Graphics, Int32, Int32, Boolean, GridStyleInfo)

Draws the cell button element at the specified row and column index.

Declaration

protected virtual void OnDrawCellButton(GridCellButton button, Graphics g, int rowIndex, int colIndex, bool bActive, GridStyleInfo style)

Parameters

Type	Name	Description
GridCellButton	button	The GridCellButton to be drawn.
System.Drawing.Graphics	g	The System.Drawing.Graphics context of the canvas.
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Boolean	bActive	True if this is the active current cell; False otherwise.
GridStyleInfo	style	The GridStyleInfo object that holds cell information.

OnDrawCellButtonBackground(GridCellButton, Graphics, Rectangle, ButtonState, GridStyleInfo)

Draws a button using System.Windows.Forms.ControlPaint.DrawButton(System.Drawing.Graphics,System.Drawing.Rectangle,System.Windows.Forms.ButtonState); if XP Themes are enabled, button will be drawn themed.

Declaration

protected virtual void OnDrawCellButtonBackground(GridCellButton button, Graphics g, Rectangle rect, ButtonState buttonState, GridStyleInfo style)

Parameters

Type	Name	Description
GridCellButton	button	The GridCellButton to be drawn.
System.Drawing.Graphics	g	The System.Drawing.Graphics context of the canvas.
System.Drawing.Rectangle	rect	The System.Drawing.Rectangle with the bounds.
System.Windows.Forms.ButtonState	buttonState	A System.Windows.Forms.ButtonState that specifies the current state.
GridStyleInfo	style	The GridStyleInfo object that holds cell information.

Remarks

Override this method if you want to have buttons with a customized color, e.g. a push button drawn with the back color as specified with the interior property.

Examples

This example draws a custom button element background.

        public static void Draw3dFrame(Graphics g, int x0, int y0, int x1, int y1, int w, Color rgbTopLeft, Color rgbBottomRight)
        {
            Rectangle rc;
            for (int i = 0; i != w; i++)
            {
                // Top
                Brush brTL = new SolidBrush(rgbTopLeft);
                rc = Rectangle.FromLTRB(x0, y0, x1, y0+1);
                g.FillRectangle(brTL, rc);
                // Left
                rc = Rectangle.FromLTRB(x0, y0, x0+1, y1);
                g.FillRectangle(brTL, rc);
                brTL.Dispose();
                Brush brBR = new SolidBrush(rgbBottomRight);
                // Bottom
                rc = Rectangle.FromLTRB(x0, y1, x1+1, y1+1);
                g.FillRectangle(brBR, rc);
                // Right
                rc = Rectangle.FromLTRB(x1, y0, x1+1, y1);
                g.FillRectangle(brBR, rc);
                brBR.Dispose();
                if (i != w-1)
                {
                    x0++;
                    y0++;
                    x1--;
                    y1--;
                }
            }
        }
        protected override void OnDrawCellButtonBackground(GridCellButton button, Graphics g, Rectangle rect, ButtonState buttonState, GridStyleInfo style)
        {
            bool drawPressed = (buttonState & ButtonState.Pushed) != 0;
            Color hilight = SystemColors.ControlLightLight;
            Color shadow = SystemColors.ControlDarkDark;
            if (!drawPressed)
            {
                GridPaint.Draw3dFrame(g, rect.Left, rect.Top, rect.Right-1, rect.Bottom-1, 1,
                    hilight, shadow);
            }
            else
            {
                Brush br = new SolidBrush(shadow);
                g.FillRectangle(br, Rectangle.FromLTRB(rect.Left, rect.Bottom-1, rect.Right-1, rect.Bottom));
                g.FillRectangle(br, Rectangle.FromLTRB(rect.Right-1, rect.Top, rect.Right, rect.Bottom));
                br.Dispose();
            }
        }

Public Shared Sub Draw3dFrame(g As Graphics, x0 As Integer, y0 As Integer, x1 As Integer, y1 As Integer, w As Integer, rgbTopLeft As Color, rgbBottomRight As Color)
    Dim rc As Rectangle
    Dim i As Integer
    While i <> w
        ' Top
        Dim brTL = New SolidBrush(rgbTopLeft)
        rc = Rectangle.FromLTRB(x0, y0, x1, y0 + 1)
        g.FillRectangle(brTL, rc)
        ' Left
        rc = Rectangle.FromLTRB(x0, y0, x0 + 1, y1)
        g.FillRectangle(brTL, rc)
        brTL.Dispose()
        Dim brBR = New SolidBrush(rgbBottomRight)
        ' Bottom
        rc = Rectangle.FromLTRB(x0, y1, x1 + 1, y1 + 1)
        g.FillRectangle(brBR, rc)
        ' Right
        rc = Rectangle.FromLTRB(x1, y0, x1 + 1, y1)
        g.FillRectangle(brBR, rc)
        brBR.Dispose()
        If i <> w - 1 Then
            x0 += 1
            y0 += 1
            x1 -= 1
            y1 -= 1
        End If
        i += 1
    End While
End Sub 'Draw3dFrame

Protected Overrides Sub OnDrawCellButtonBackground(button As GridCellButton, g As Graphics, rect As Rectangle, buttonState As ButtonState, style As GridStyleInfo)
    Dim drawPressed As Boolean = (buttonState And ButtonState.Pushed) <> 0
    Dim hilight As Color = SystemColors.ControlLightLight
    Dim shadow As Color = SystemColors.ControlDarkDark
    If Not drawPressed Then
        GridPaint.Draw3dFrame(g, rect.Left, rect.Top, rect.Right - 1, rect.Bottom - 1, 1, hilight, shadow)
    Else
        Dim br = New SolidBrush(shadow)
        g.FillRectangle(br, Rectangle.FromLTRB(rect.Left, rect.Bottom - 1, rect.Right - 1, rect.Bottom))
        g.FillRectangle(br, Rectangle.FromLTRB(rect.Right - 1, rect.Top, rect.Right, rect.Bottom))
        br.Dispose()
    End If
End Sub 'OnDrawCellButtonBackground

OnEditingComplete()

Occurs when the grid completes editing mode for the active current cell.

Declaration

protected virtual void OnEditingComplete()

Remarks

The grid raises this event when the CurrentCell objects EndEdit() or CancelEdit() method is called. The event occurs after CurrentCellRejectedChanges or CurrentCellAcceptedChanges is raised.

You can determine if Deactivate(Boolean) was called stand-alone or as result of a MoveTo(Int32, Int32, GridSetCurrentCellOptions, Boolean) call by checking the IsInMoveTo property.

You can find out about the current cell's position by querying the RowIndex and ColIndex properties of the CurrentCell object in GridControlBase.

See MoveTo(Int32, Int32, GridSetCurrentCellOptions, Boolean) for a discussion about the order of events that you receive when the current cell is moved.

OnEndEdit()

Called from GridCurrentCell.EndEdit. If render had focus, Syncfusion.Windows.Forms.Grid.GridCellRendererBase.SetHasFocusControl(System.Boolean) is called which triggers OnHasFocusControlChanged() and initiates repainting the cell. In your overridden OnDraw(Graphics, Rectangle, Int32, Int32, GridStyleInfo) method, you should then check ShouldDrawFocused(Int32, Int32) which will return False.

Declaration

protected virtual void OnEndEdit()

OnGetCursor(Int32, Int32)

Override this method if you want to change the cursor for this cell.

Declaration

protected virtual Cursor OnGetCursor(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.

Returns

Type	Description
System.Windows.Forms.Cursor	The System.Windows.Forms.Cursor to be displayed.

OnGridGotFocus(EventArgs)

Called when the parent grid of this cell renderer gets the focus.

Declaration

protected virtual void OnGridGotFocus(EventArgs e)

Parameters

Type	Name	Description
System.EventArgs	e	An System.EventArgsthat contains event data.

OnHasFocusControlChanged()

Override this method if your cell renderer supports in-place editing and you want to do any custom initialization at this point before cell gets redrawn.

Declaration

protected virtual void OnHasFocusControlChanged()

Remarks

The default behavior of this virtual method is to force a redraw of the current cell. A cell can then initialize an edit control and set focus in the OnDraw method call.

OnHitTest(Int32, Int32, MouseEventArgs, IMouseController)

This method is called to determine whether the cell renderer wants to receive mouse events for the give cell at the given coordinates.

Declaration

protected virtual int OnHitTest(int rowIndex, int colIndex, MouseEventArgs e, IMouseController controller)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Windows.Forms.MouseEventArgs	e	A System.Windows.Forms.MouseEventArgs with data about the mouse event.
IMouseController	controller	The current controller requested to handle this mouse event.

Returns

Type	Description
System.Int32	Non-zero hit context value if you request to handle the mouse event; zero if you vote not to handle the mouse event.

Remarks

Override this method and return GridHitTestContext.Cell (or any other non-zero value) to force mouse messages (OnMouseDown, OnMouseHover, OnMouseUp) being called for the cell renderer.

OnInitialize(Int32, Int32)

This method gets called from the cell renderer's initialize method. Override this method if you need to any initialization for the current cell.

Declaration

protected virtual void OnInitialize(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.

OnKeyDown(KeyEventArgs)

Raises the event when user pressed key down (similar to Control.OnKeyDown).

Declaration

protected virtual void OnKeyDown(KeyEventArgs e)

Parameters

Type	Name	Description
System.Windows.Forms.KeyEventArgs	e	A System.Windows.Forms.KeyEventArgs with data of the keyboard event.

OnKeyPress(KeyPressEventArgs)

Raises the event when user pressed key (similar to Control.OnKeyPress).

Declaration

protected virtual void OnKeyPress(KeyPressEventArgs e)

Parameters

Type	Name	Description
System.Windows.Forms.KeyPressEventArgs	e	A System.Windows.Forms.KeyEventArgs with data of the keyboard event.

OnKeyUp(KeyEventArgs)

Raises the event when user released key (similar to Control.OnKeyUp).

Declaration

protected virtual void OnKeyUp(KeyEventArgs e)

Parameters

Type	Name	Description
System.Windows.Forms.KeyEventArgs	e	A System.Windows.Forms.KeyEventArgs with data of the keyboard event.

OnLayout(Int32, Int32, GridStyleInfo, Rectangle, Rectangle[])

This method is called from PerformLayout to calculate the client rectangle given the inner rectangle of a cell and any boundaries of cell buttons.

Declaration

protected virtual Rectangle OnLayout(int rowIndex, int colIndex, GridStyleInfo style, Rectangle innerBounds, Rectangle[] buttonsBounds)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
GridStyleInfo	style	The GridStyleInfo object that holds cell information.
System.Drawing.Rectangle	innerBounds	The System.Drawing.Rectangle with the inner bounds of a cell.
System.Drawing.Rectangle[]	buttonsBounds	An array of System.Drawing.Rectangle with bounds for each cell button element.

Returns

Type	Description
System.Drawing.Rectangle	A System.Drawing.Rectangle with the bounds.

OnModelChanged(EventArgs)

Override this method if you need to know when reference to cell model is changed. This method is called after the reference to cell model has been changed.

Declaration

protected virtual void OnModelChanged(EventArgs e)

Parameters

Type	Name	Description
System.EventArgs	e	Always EventArgs.Empty.

OnMouseDown(Int32, Int32, MouseEventArgs)

Declaration

protected virtual void OnMouseDown(int rowIndex, int colIndex, MouseEventArgs e)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Windows.Forms.MouseEventArgs	e	A System.Windows.Forms.MouseEventArgs with event data.

OnMouseHover(Int32, Int32, MouseEventArgs)

Declaration

protected virtual void OnMouseHover(int rowIndex, int colIndex, MouseEventArgs e)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Windows.Forms.MouseEventArgs	e	A System.Windows.Forms.MouseEventArgs with event data.

Remarks

OnMouseHover will only be called after OnMouseHoveEnter. When the user moves the mouse out of the MouseHoverLeave is called.

OnMouseHoverEnter(Int32, Int32)

Declaration

protected virtual void OnMouseHoverEnter(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index of current cell.
System.Int32	colIndex	The column index of current cell.

Remarks

OnMouseHoverLeave(Int32, Int32, EventArgs)

Declaration

protected virtual void OnMouseHoverLeave(int rowIndex, int colIndex, EventArgs e)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.EventArgs	e	An System.EventArgs with event data.

Remarks

Once OnMouseHoveEnter has been called you are guaranteed to receive a OnMouseHoverLeave call either if the user moves the mouse of the cell boundaries or presses a button or if the mouse operation is canceled.

OnMouseMove(Int32, Int32, MouseEventArgs)

Declaration

protected virtual void OnMouseMove(int rowIndex, int colIndex, MouseEventArgs e)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Windows.Forms.MouseEventArgs	e	A System.Windows.Forms.MouseEventArgs with event data.

OnMouseUp(Int32, Int32, MouseEventArgs)

Declaration

protected virtual void OnMouseUp(int rowIndex, int colIndex, MouseEventArgs e)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Windows.Forms.MouseEventArgs	e	A System.Windows.Forms.MouseEventArgs with event data.

OnNotifyMsg(ref Message)

Called from OnVScroll, OnHScroll before grid is scrolled.

Declaration

public virtual void OnNotifyMsg(ref Message pMsg)

Parameters

Type	Name	Description
System.Windows.Forms.Message	pMsg	The Message

Remarks

Will deactivate the current cell when the user scrolls to the right and the current cell is a floating or covered cell which spans the freeze columns / row line.

Also, any dropped-down windows will be closed.

OnOutlineCurrentCell(Graphics, Rectangle)

Highlights the current cell by inverting the cells border or drawing a thick border.

Declaration

protected virtual void OnOutlineCurrentCell(Graphics g, Rectangle r)

Parameters

Type	Name	Description
System.Drawing.Graphics	g	Points to the device context.
System.Drawing.Rectangle	r	Specifies the cell rectangle.

Remarks

Override this method if you don't want the default highlighting of your cell.

OnPrepareViewStyleInfo(GridPrepareViewStyleInfoEventArgs)

Allows custom formatting of a cell by changing its style object.

Declaration

public virtual void OnPrepareViewStyleInfo(GridPrepareViewStyleInfoEventArgs e)

Parameters

Type	Name	Description
GridPrepareViewStyleInfoEventArgs	e	Event data

Remarks

OnPrepareViewStyleInfo(GridPrepareViewStyleInfoEventArgs) is called from PrepareViewStyleInfo in order to allow custom formatting of a cell by changing its style object.

Set the cancel property true if you want to avoid the associated cell renderers object OnPrepareViewStyleInfo(GridPrepareViewStyleInfoEventArgs) method to be called.

Changes made to the style object will not be saved in the grid nor cached. This event is called every time a portion of the grid is repainted and the specified cell belongs to the invalidated region of the window that needs to be redrawn.

Changes to the style object done at this time will also not be reflected when accessing cells though the models indexer. See QueryCellInfo.

note

Do not change base style or cell type at this time.

OnQueryShowButtons(Int32, Int32, GridStyleInfo)

Determines whether the cell buttons shall be drawn for the specific row and column index.

Declaration

protected virtual bool OnQueryShowButtons(int rowIndex, int colIndex, GridStyleInfo style)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
GridStyleInfo	style	The GridStyleInfo object that holds cell information.

Returns

Type	Description
System.Boolean	returns boolean value to indicate the cell buttons shall be drawn for the specific row and column index.

OnRejectChanges()

This is called from GridCurrentCell.RejectChanges. Any drop-downs have been closed at this time.

Declaration

protected virtual void OnRejectChanges()

OnSaveChanges()

This method is called from GridCurrentCell.ConfirmChanges when the current cell was marked as modified. Any drop-downs have been closed at this time. It saves changes for the current cell.

Declaration

protected virtual bool OnSaveChanges()

Returns

Type	Description
System.Boolean	True if changes were saved successfully; False if no changes were saved.

OnScrollInView(GridScrollCurrentCellReason)

Called from GridCurrentCell.ScrollInView to determine if cell should be scrolled into view when GridCurrentCell.ScrollInView is called.

Declaration

public virtual bool OnScrollInView(GridScrollCurrentCellReason reason)

Parameters

Type	Name	Description
GridScrollCurrentCellReason	reason	The reason for scrolling current cell into view.

Returns

Type	Description
System.Boolean	True if cell supports scrolling into view.

OnSetControlText(String)

Called right after ControlText was set.

Declaration

protected virtual void OnSetControlText(string text)

Parameters

Type	Name	Description
System.String	text	The ControlText

OnShowDropDown()

This is called from GridCurrentCell.ShowDropDown after BeginEdit has been called.

Declaration

protected virtual void OnShowDropDown()

Remarks

If your renderer supports dropped-down state, the drop-down window should be made visible at this time.

OnStartEditing()

Occurs before the current cell switches into editing mode.

Declaration

protected virtual bool OnStartEditing()

Returns

Type	Description
System.Boolean	True if editing the cell is allowed; false otherwise.

Remarks

The grid will switch into editing mode when the user presses a key while the cell is not in editing mode or when you call BeginEdit(). You can cancel the operation by overriding this method and returning false.

You can find out about the current cell's position by querying the RowIndex and ColIndex properties of the CurrentCell object in GridControlBase.

See MoveTo(Int32, Int32, GridSetCurrentCellOptions, Boolean) for a discussion about the order of events you receive when the current cell is moved.

OnValidate()

This method is called from GridCurrentCell.Validate after GridCurrentCell.Validating event has been fired. The default version checks if the active text fits any criteria as specified in the style object: It can be parsed into a cell value and meets GridCellValidateValueInfo criteria.

Declaration

protected virtual bool OnValidate()

Returns

Type	Description
System.Boolean	True if the modified text is valid; False otherwise.

Remarks

If you throw an exception in your override, the exception message will be stored in the GridCurrentCell.ErrorMessage string and if specified, a message box will be shown.

OnValidate will call ValidateString, which you can also override.

OnValidated()

This method is called from GridCurrentCell.Validate after the current cell contents were successfully validated and before GridCurrentCell.Validated event is. fired.

Declaration

protected virtual void OnValidated()

Paste()

Called when user initiates a clipboard paste and the grid has a current cell but no range is selected.

Declaration

public virtual bool Paste()

Returns

Type	Description
System.Boolean	True if successful; False if failed.

PerformLayout(Int32, Int32)

Calculates the CellLayout for the specified cell using cell state information as specified in the style object.

Declaration

public GridCellLayout PerformLayout(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.

Returns

Type	Description
GridCellLayout	The GridCellLayout with layout information.

PerformLayout(Int32, Int32, GridStyleInfo)

Calculates the CellLayout for the specified cell using cell state information as specified in the style object.

Declaration

public GridCellLayout PerformLayout(int rowIndex, int colIndex, GridStyleInfo style)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
GridStyleInfo	style	The GridStyleInfo object that holds cell information.

Returns

Type	Description
GridCellLayout	The GridCellLayout with layout information.

PerformLayout(Int32, Int32, GridStyleInfo, Rectangle)

Calculates the CellLayout for the specified cell using cell state information as specified in the style object.

Declaration

public GridCellLayout PerformLayout(int rowIndex, int colIndex, GridStyleInfo style, Rectangle cellRectangle)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
GridStyleInfo	style	The GridStyleInfo object that holds cell information.
System.Drawing.Rectangle	cellRectangle	The Rectangle.

Returns

Type	Description
GridCellLayout	The GridCellLayout with layout information.

ProcessKeyEventArgs(ref Message)

This is called from GridControlBase.ProcessKeyEventArgs and allows your customized cell renderer to process keyboard events before the GridControlBase gets the actual KeyDown / KeyUp event.

Declaration

protected virtual bool ProcessKeyEventArgs(ref Message m)

Parameters

Type	Name	Description
System.Windows.Forms.Message	m	The System.Windows.Forms.Message with data of the keyboard event.

Returns

Type	Description
System.Boolean	True if key was handled; False otherwise.

ProcessMouseWheel(MouseEventArgs)

Lets you customize and redirect mouse wheel behavior to a cell renderer, e.g. if you have a drop-down displayed. Returns true if parent grid should not be scrolled; False if parent grid should scroll.

Declaration

public virtual bool ProcessMouseWheel(MouseEventArgs e)

Parameters

Type	Name	Description
System.Windows.Forms.MouseEventArgs	e	The mouse event arguments.

Returns

Type	Description
System.Boolean	returns False.

QueryFocusInside()

Determines if this control contains focus. Override this method if you want to show drop-down windows and indicate the control has not lost focus when the drop-down is shown.

Declaration

public virtual bool QueryFocusInside()

Returns

Type	Description
System.Boolean	True if the control or any child control has focus; False otherwise.

RaiseCancelMode(Int32, Int32)

Raises a CellCancelMode event and initiates a call to the virtual OnCancelMode(Int32, Int32) method.

Declaration

public void RaiseCancelMode(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.

RaiseClick(Int32, Int32, MouseEventArgs)

Raises a CellClick event and initiates a call to the virtual OnClick(Int32, Int32, MouseEventArgs) method.

Declaration

public void RaiseClick(int rowIndex, int colIndex, MouseEventArgs e)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Windows.Forms.MouseEventArgs	e	A System.Windows.Forms.MouseEventArgs with data about the mouse event.

RaiseDoubleClick(Int32, Int32, MouseEventArgs)

Raises a CellDoubleClick event and initiates a call to the virtual OnDoubleClick(Int32, Int32, MouseEventArgs) method.

Declaration

public void RaiseDoubleClick(int rowIndex, int colIndex, MouseEventArgs e)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Windows.Forms.MouseEventArgs	e	A System.Windows.Forms.MouseEventArgs with data about the mouse event.

RaiseGetCursor(Int32, Int32)

This is called from GridClickCellsMouseController or GridSelectCellsMouseController. Returns the cursor to be displayed at the given row or column.

Declaration

public Cursor RaiseGetCursor(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.

Returns

Type	Description
System.Windows.Forms.Cursor	returns Cursor

RaiseHitTest(Int32, Int32, MouseEventArgs, IMouseController)

This is called from GridClickCellsMouseController or GridSelectCellsMouseController. Checks if the mouse is over a cell button element and if the cell is click-able.

Declaration

public int RaiseHitTest(int rowIndex, int colIndex, MouseEventArgs mouseEventArgs, IMouseController controller)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Windows.Forms.MouseEventArgs	mouseEventArgs	A System.Windows.Forms.MouseEventArgs with data about the mouse event.
IMouseController	controller	The current controller requested to handle this mouse event.

Returns

Type	Description
System.Int32	Non-zero hit context value if you request to handle the mouse event; zero if you vote not to handle the mouse event.

Remarks

Override OnHitTest in your derived cell renderer if you want to catch mouse events.

RaiseMouseDown(Int32, Int32, MouseEventArgs)

Raises a CellMouseDown event and initiates a call to the virtual OnMouseDown(Int32, Int32, MouseEventArgs) method.

Declaration

public void RaiseMouseDown(int rowIndex, int colIndex, MouseEventArgs e)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Windows.Forms.MouseEventArgs	e	A System.Windows.Forms.MouseEventArgs with event data.

RaiseMouseHover(Int32, Int32, MouseEventArgs)

Raises a CellMouseHover event and initiates a call to the virtual OnMouseHoverEnter(Int32, Int32) method.

Declaration

public void RaiseMouseHover(int rowIndex, int colIndex, MouseEventArgs e)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Windows.Forms.MouseEventArgs	e	A System.Windows.Forms.MouseEventArgs with event data.

RaiseMouseHoverEnter(Int32, Int32)

This is called from GridClickCellsMouseController or GridSelectCellsMouseController when HitTest has indicated it wants to receive mouse events and the user has moved the mouse into the cell.

Declaration

public void RaiseMouseHoverEnter(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index of the current cell.
System.Int32	colIndex	The column index of the current cell.

Remarks

RaiseMouseHoverLeave(Int32, Int32, EventArgs)

Raises a CellMouseHoverLeave event and initiates a call to the virtual OnMouseHoverLeave(Int32, Int32, EventArgs) method.

Declaration

public void RaiseMouseHoverLeave(int rowIndex, int colIndex, EventArgs e)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.EventArgs	e	An System.EventArgs with event data.

RaiseMouseMove(Int32, Int32, MouseEventArgs)

Raises a CellMouseMove event and initiates a call to the virtual OnMouseMove(Int32, Int32, MouseEventArgs) method.

Declaration

public void RaiseMouseMove(int rowIndex, int colIndex, MouseEventArgs e)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Windows.Forms.MouseEventArgs	e	A System.Windows.Forms.MouseEventArgs with event data.

RaiseMouseUp(Int32, Int32, MouseEventArgs)

Raises a CellMouseUp event and initiates a call to the virtual OnMouseUp(Int32, Int32, MouseEventArgs) method.

Declaration

public void RaiseMouseUp(int rowIndex, int colIndex, MouseEventArgs e)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
System.Windows.Forms.MouseEventArgs	e	A System.Windows.Forms.MouseEventArgs with event data.

RaiseProcessKeyEventArgs(ref Message)

Calls protected virtual ProcessKeyEventArgs(ref Message) method.

Declaration

public bool RaiseProcessKeyEventArgs(ref Message m)

Parameters

Type	Name	Description
System.Windows.Forms.Message	m	The System.Windows.Forms.Message with data of the keyboard event.

Returns

Type	Description
System.Boolean	True if key was handled; False otherwise.

RemoveButton(GridCellButton)

Removes a GridCellButton from the cell renderer's list of cell buttons.

Declaration

protected void RemoveButton(GridCellButton button)

Parameters

Type	Name	Description
GridCellButton	button	The GridCellButton to remove.

RemoveMargins(Rectangle, GridStyleInfo)

Removes TextMargins from the specified client bounds.

Declaration

protected virtual Rectangle RemoveMargins(Rectangle clientRectangle, GridStyleInfo style)

Parameters

Type	Name	Description
System.Drawing.Rectangle	clientRectangle	The Rectangle
GridStyleInfo	style	The GridStyleInfo object that holds cell information.

Returns

Type	Description
System.Drawing.Rectangle	A System.Drawing.Rectangle with the bounds.

ReplaceSel(String)

Replaces the selected text in the current cell.

Declaration

public virtual void ReplaceSel(string replacement)

Parameters

Type	Name	Description
System.String	replacement	The string to replace the current selected text.

ReplaceText(String, String, Int32, Int32, GridFindTextOptions, Boolean)

Searches the specified text and optionally moves the current cell to the cell if the text was found.

Declaration

public virtual bool ReplaceText(string find, string replace, int rowIndex, int colIndex, GridFindTextOptions options, bool bSetCell)

Parameters

Type	Name	Description
System.String	find	The text to be searched.
System.String	replace	The replace text.
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.
GridFindTextOptions	options	Search criteria.
System.Boolean	bSetCell	True if current cell should be moved after text was found.

Returns

Type	Description
System.Boolean	True if text was found; False otherwise.

ResetCellLayout()

Reset window coordinates (cell bounds) of the cell.

Declaration

public void ResetCellLayout()

ResetControlText()

Resets the ControlText to its original state.

Declaration

public void ResetControlText()

ResetControlValue()

Resets the cell value of the current cell to its original state.

Declaration

public void ResetControlValue()

SetControl(Control)

Sets a reference to the associated control.

Declaration

protected void SetControl(Control control)

Parameters

Type	Name	Description
System.Windows.Forms.Control	control	The Control to be associated with.

SetControlValue(Object, Boolean)

Sets the cell value for the current cell and optionally initializes the ControlText based on the value.

Declaration

protected void SetControlValue(object value, bool initControlText)

Parameters

Type	Name	Description
System.Object	value	The cell value.
System.Boolean	initControlText	True if InitializeControlText should be called.

SetEditState(Object)

Restores previously retrieved editing state information from a GetEditState() call.

Declaration

public virtual void SetEditState(object state)

Parameters

Type	Name	Description
System.Object	state	The cell-type specific object with editing state information.

Remarks

You need to override this method in a derived cell-type class. Otherwise calling this method will have no effect.

ShouldDrawEditing(Int32, Int32)

Determines if the cell at the specified row and column should be drawn in "editing" mode.

Declaration

public bool ShouldDrawEditing(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.

Returns

Type	Description
System.Boolean	True if the cell should be drawn in "editing" mode; False otherwise.

ShouldDrawFocused(Int32, Int32)

Determines if the cell at the specified row and column should be drawn "focused".

Declaration

public bool ShouldDrawFocused(int rowIndex, int colIndex)

Parameters

Type	Name	Description
System.Int32	rowIndex	The row index.
System.Int32	colIndex	The column index.

Returns

Type	Description
System.Boolean	True if the cell should be drawn "focused".

ShouldRefreshCurrentCell()

Called to determine whether the cell needs to be repainted when it becomes the active current cell.

Declaration

public virtual bool ShouldRefreshCurrentCell()

Returns

Type	Description
System.Boolean	True if cell needs to be repainted; False otherwise.

ToString()

Returns a System.String that represents the current System.Object.

Declaration

public override string ToString()

Returns

Type	Description
System.String	A System.String that represents the current System.Object.

Overrides

System.Object.ToString()

UnwireModel(GridCellModelBase)

Override this method if you are subscribing to events from a cell model. It is called before the reference to the cell model is reset or when dispose has been called.

Declaration

protected virtual void UnwireModel(GridCellModelBase cellModel)

Parameters

Type	Name	Description
GridCellModelBase	cellModel	The GridCellModelBase.

UpdateControlValue()

Forces the ControlValue to reflect current control contents. Call this method if you want to know the value that will be saved in CellValue if user would accept current cells contents.

Declaration

public virtual void UpdateControlValue()

Remarks

This method requires that ControlText contains most recent value. Override this method and derived cell renderers if you need to get the text from the embedded control.

TextBoxCellRenderer does for example get the value from TextBoxText instead.

ValidateString(String)

Called from OnValidate and checks whether the specified text is valid.

Declaration

public virtual bool ValidateString(string text)

Parameters

Type	Name	Description
System.String	text	Text to be validated.

Returns

Type	Description
System.Boolean	True if text if valid; False otherwise.

Remarks

This also works for limiting the keyboard input, e.g. only digits. Called after the user pressed a key and before it is accepted.

Examples

Don't allow "-" to be typed.

          public override bool ValidateString(string text)
          {
               TraceUtil.TraceCurrentMethodInfoIf(Switches.CellRenderer.TraceVerbose, text);
               if (text.IndexOf("-") != -1)
                    return false;
               return true;
          }

WireModel(GridCellModelBase)

Override this method if you are subscribing to events from a cell model. It is called after the reference to the cell model has been initialized.

Declaration

protected virtual void WireModel(GridCellModelBase cellModel)

Parameters

Type	Name	Description
GridCellModelBase	cellModel	The GridCellModelBase.

Explicit Interface Implementations

IPopupItem.GetPopupParentControl()

Declaration

Control IPopupItem.GetPopupParentControl()

Returns

Type
System.Windows.Forms.Control

IPopupParent.GetBorderOverlapCue(PopupRelativeAlignment)

Declaration

Point[] IPopupParent.GetBorderOverlapCue(PopupRelativeAlignment relativeAlignment)

Parameters

Type	Name	Description
PopupRelativeAlignment	relativeAlignment

Returns

Type
System.Drawing.Point[]

IPopupParent.GetLocationForPopupAlignment(PopupRelativeAlignment, out PopupRelativeAlignment)

Declaration

Point IPopupParent.GetLocationForPopupAlignment(PopupRelativeAlignment prevAlign, out PopupRelativeAlignment newAlign)

Parameters

Type	Name	Description
PopupRelativeAlignment	prevAlign
PopupRelativeAlignment	newAlign

Returns

Type
System.Drawing.Point

IPopupParent.IsRightToLeft

Gets a value indicates whether control's elements should be rendered right-to-left.

Declaration

bool IPopupParent.IsRightToLeft { get; }

Returns

Type
System.Boolean

Implements

IQueryFocusInside

IGridDropDownCell

IPopupParent

IPopupItem

System.IDisposable