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SelectionStrategyFilter Property

Returns or sets the selection strategy filter for the control.
Syntax
'Declaration
 
Public Property SelectionStrategyFilter As Infragistics.Win.ISelectionStrategyFilter
public Infragistics.Win.ISelectionStrategyFilter SelectionStrategyFilter {get; set;}
Remarks

You can specify what type of selection is allowed for various types of objects by using the properties of the UltraGridOverride object. The properties UltraGridOverride.SelectTypeCell, UltraGridOverride.SelectTypeCol, UltraGridOverride.SelectTypeGroupByRow and UltraGridOverride.SelectTypeRow are used to specify a selection strategy for the corresponding type of object.

UltraWinGrid uses selection strategies to control the types of selection the user can perform in the control. A selection strategy is an extended set of attributes covering options such as multiple vs. single selection, range vs. discrete selection, non-contiguous selection, what types of objects may be selected and how selection is initiated and completed using the keyboard and mouse. Selection strategies are implemented using the SelectionManager object and the ISelectionFilter interface. Selection strategies are defined in the Infragistics.Win assembly.

UltraWinGrid includes pre-defined strategies for the most common types of selection that are performed in a grid. You can also create your own selection strategies by deriving your own selection filter classes from those supplied and overriding selected virtual methods.

Since selection is primarily a function of the user interface, selection logic is based off of the UIElement for an object. The Selectable property of the UIElement determines whether the object can be selected.

The following table lists the default key mappings for the UltraGrid control:

KeyCode ActionCode StateRequired StateDisallowed SpecialKeysRequired SpecialKeysDisallowed
Right NextCell Cell InEdit None AltCtrl
Tab NextCellByTab Cell None None All
Left PrevCell Cell InEdit None AltCtrl
Tab PrevCellByTab Cell None Shift AltCtrl
Up AboveCell Cell InEdit None Alt
Down BelowCell Cell InEdit None Alt
Home FirstRowInBand Row Cell None AltCtrl
End LastRowInBand Row Cell None AltCtrl
Right FirstRowInGrid None Row None Alt
Down FirstRowInGrid None Row None Alt
Home FirstRowInGrid Row Cell Ctrl Alt
End LastRowInGrid Row Cell Ctrl Alt
Right ExpandRow RowExpandable Cell, RowExpanded None Alt
Left CollapseRow RowExpanded Cell None Alt
Right NextRow Row Cell, RowExpandable None Alt
Right NextRow Row, RowExpanded Cell None Alt
Tab NextRowByTab Row Cell None All
Left PrevRow Row Cell, RowExpanded None Alt
Tab PrevRowByTab Row Cell Shift AltCtrl
Up AboveRow Row Cell None Alt
Down BelowRow Row Cell None Alt
Space ToggleCheckbox InEdit, IsCheckbox None None All
Space ToggleCellSel Cell InEdit None All
Space ToggleRowSel Row Cell None All
Space DeactivateCell Cell None Ctrl AltShift
Space ActivateCell Row Cell Ctrl AltShift
Right NextCellInBand Cell InEdit Ctrl Alt
Left PrevCellInBand Cell InEdit Ctrl Alt
Home FirstCellInRow Cell CellFirst, InEdit None AltCtrl
End LastCellInRow Cell CellLast, InEdit None AltCtrl
Home FirstCellInBand CellFirst InEdit None AltCtrl
End LastCellInBand CellLast InEdit None AltCtrl
Home FirstCellInGrid Cell InEdit Ctrl Alt
End LastCellInGrid Cell InEdit Ctrl Alt
Prior PageUpCell Cell InEdit None Alt
Next PageDownCell Cell InEdit None Alt
Prior PageUpRow Row Cell None Alt
Next PageDownRow Row Cell None Alt
Escape UndoCell InEdit IsDroppedDown None Alt
Escape UndoRow Row InEdit None Alt
Escape CloseDropdown IsDroppedDown None None Alt
Enter CloseDropdown IsDroppedDown None None Alt
Enter ExpandRow GroupByRow IsDroppedDown, RowExpanded None Alt
Enter CollapseRow RowExpanded, GroupByRow IsDroppedDown None Alt
F4 ToggleDropdown HasDropdown, InEdit None None Alt
Up ToggleDropdown HasDropdown, InEdit None Alt None
Down ToggleDropdown HasDropdown, InEdit None Alt None
F2 ToggleEditMode Cell None None Alt
F4 EnterEditModeAndDropdown HasDropdown InEdit None Alt
Up EnterEditModeAndDropdown HasDropdown InEdit Alt None
Down EnterEditModeAndDropdown HasDropdown InEdit Alt None
F6 NextRegion None InEdit None All
F6 PrevRegion None InEdit Shift AltCtrl
Delete DeleteRows Row InEdit None All
F2 EnterEditMode Cell InEdit None Alt
F2 ExitEditMode InEdit None None Alt

Example

The following sample code illustrates how to supply a custom selection strategy for cells in an UltraGridControl.


Note: this is not usually necessary. Normally, the selection strategy for cells is based on the setting of the 'SelectTypeCell' property of the UltraGridOverride object.



Imports Infragistics.Win
    Imports Infragistics.Win.UltraWinGrid


' Implement the ISelectionStrategyFilter interface on a class
' (in this case the form)
Public Class Form1
    Inherits System.Windows.Forms.Form
    Implements Infragistics.Win.ISelectionStrategyFilter

    Private cellSelectionStrategy As MyCustomSelectionStrategy

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 
        ' Create the custom selection strategy
        Me.cellSelectionStrategy = New MyCustomSelectionStrategy(Me.UltraGrid1)

        ' Set the grid’s SelectionStrategyFilter property to the object that
        ' implements the ISelectionStrategyFilter interface.
        Me.UltraGrid1.SelectionStrategyFilter = Me

    End Sub

    Public Function GetSelectionStrategy(ByVal item As Infragistics.Shared.ISelectableItem) As Infragistics.Win.ISelectionStrategy Implements Infragistics.Win.ISelectionStrategyFilter.GetSelectionStrategy

        ' If the item is a cell return the custom strategy
        If TypeOf (item) Is UltraGridCell Then
            Return Me.cellSelectionStrategy
        End If

        ' Return null to have the grid provide an appropriate strategy
        Return Nothing

    End Function
End Class

' derive a class from one of the selection
' strategies defines in the PLF 
Friend Class MyCustomSelectionStrategy
    Inherits Infragistics.Win.SelectionStrategyExtended

    Public Sub New(ByVal manager As ISelectionManager)

        MyBase.New(manager)

    End Sub

    Public Overloads Overrides Function OnMouseDown(ByVal item As Infragistics.Shared.ISelectableItem, ByRef msginfo As Infragistics.Win.MouseMessageInfo) As Boolean

        ' Do some custom mouse down processing
        ' ...
        Return MyBase.OnMouseDown(item, msginfo)

    End Function
End Class
using System.Diagnostics;
	using Infragistics.Win;
	using Infragistics.Win.UltraWinGrid;

// Implement the ISelectionStrategyFilter interface on a class
// (in this case the form)
public class Form1 : 
		System.Windows.Forms.Form, 
		Infragistics.Win.ISelectionStrategyFilter
{

	private ISelectionStrategy cellSelectionStrategy;


	private void Form1_Load(object sender, System.EventArgs e)
	{

		// Set the grid’s SelectionStrategyFilter property to the object that
		// implements the ISelectionStrategyFilter interface.

		this.ultraGrid1.SelectionStrategyFilter = this;

		// Create the custom selection strategy

		this.cellSelectionStrategy = new MyCustomSelectionStrategy( this.ultraGrid1 );

	}

	public Infragistics.Win.ISelectionStrategy GetSelectionStrategy(Infragistics.Shared.ISelectableItem item)
	{

		// If the item is a cell return the custom strategy
		if ( item is UltraGridCell )
			return this.cellSelectionStrategy;

		return null;

	}

	// derive a class from one of the selection
	// strategies defines in the PLF 
	internal class MyCustomSelectionStrategy 
					: SelectionStrategyExtended
	{
		internal MyCustomSelectionStrategy( ISelectionManager manager ) 
			: base( manager )
		{
		}

		public override bool OnMouseDown(Infragistics.Shared.ISelectableItem item, ref Infragistics.Win.MouseMessageInfo msginfo)
		{

			// Do some custom mouse down processing
			// ...
			return base.OnMouseDown( item, ref msginfo );

		}
	}
}
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also