How to use Inking in a WinForms application

Product Version	Product	Author	Last modified
2017.2.502	RadGridView for WinForms	Dimitar Karamfilov	January 11, 2018

The below example demonstrates how one can use the InkEdit control which comes with the Microsoft Tablet PC Platform SDK, to enter data in RadGridView using a pen device.

First, you need to add a reference to the Microsft.Ink.dll. This assembly is part of the Microsoft Tablet PC Platform SDK (1.7 is the latest version).

Detailed information about the ink support in WinForms and WPF can be found in the following article: https://docs.microsoft.com/en-us/dotnet/framework/wpf/advanced/the-ink-object-model-windows-forms-and-com-versus-wpf#enabling-ink-in-an-application

Let’s start with the example.

To use pen input, we will first need a custom editor which will host the InkEdit control. The InkEdit control inherits the standard RichTextBox, therefore we need RadHostItem in order to add it inside RadGridView.

• C#
• VB.NET

class GridInkEditor : BaseGridEditor
{
    InkEdit inkEdit1;
    public override object Value
    {
        get
        {
            return inkEdit1.Text;
        }

        set
        {
            inkEdit1.Text = value == null ? "" : value.ToString();
        }
    }
    protected override RadElement CreateEditorElement()
    {
        this.inkEdit1 = new InkEdit();
        this.inkEdit1.RecoTimeout = 1000;


        this.inkEdit1.UseMouseForInput = true;

        var host = new RadHostItem(inkEdit1);
        host.BackColor = System.Drawing.Color.White;
        return host;
    }
}

Class GridInkEditor
    Inherits BaseGridEditor

    Private inkEdit1 As InkEdit

    Public Overrides Property Value As Object
        Get
            Return inkEdit1.Text
        End Get
        Set(ByVal value As Object)

          inkEdit1.Text = If(value Is Nothing, "", value.ToString())
        End Set
    End Property

    Protected Overrides Function CreateEditorElement() As RadElement
        Me.inkEdit1 = New InkEdit()
        Me.inkEdit1.RecoTimeout = 1000
        Me.inkEdit1.UseMouseForInput = True
        Dim host = New RadHostItem(inkEdit1)
        host.BackColor = System.Drawing.Color.White
        Return host
    End Function
End Class

When the editor is created we should add a GridViewTextBoxColumn which will display the text. Once the users start editing operation, the InkControl will appear and the user will be able to enter the data using a pen.

• C#
• VB.NET

public RadForm1()
{
    InitializeComponent();
    radGridView1.Columns.Add(new GridViewTextBoxColumn() { Name = "InkColumn" });
    radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
    radGridView1.EnableGrouping = false;
    radGridView1.AllowAddNewRow = false;

    for (int i = 0; i < 10; i++)
    {
        radGridView1.Rows.Add("Row Index" + i);

    }
    radGridView1.Font = new Font("Segoe UI", 16, FontStyle.Regular);
    radGridView1.TableElement.RowHeight = 50;
    radGridView1.EditorRequired += RadGridView1_EditorRequired;
}

private void RadGridView1_EditorRequired(object sender, EditorRequiredEventArgs e)
{
    if (radGridView1.CurrentColumn.Name == "InkColumn")
    {
        e.EditorType = typeof(GridInkEditor);
    }
}

Class SurroundingClass
    Public Sub New()
        InitializeComponent()
        radGridView1.Columns.Add(New GridViewTextBoxColumn() With {
            .Name = "InkColumn"
        })
        radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill
        radGridView1.EnableGrouping = False
        radGridView1.AllowAddNewRow = False

        For i As Integer = 0 To 10 - 1
            radGridView1.Rows.Add("Row Index" & i)
        Next

        radGridView1.Font = New Font("Segoe UI", 16, FontStyle.Regular)
        radGridView1.TableElement.RowHeight = 50
        AddHandler radGridView1.EditorRequired, AddressOf RadGridView1_EditorRequired
    End Sub

    Private Sub RadGridView1_EditorRequired(ByVal sender As Object, ByVal e As EditorRequiredEventArgs)
        If radGridView1.CurrentColumn.Name = "InkColumn" Then
            e.EditorType = GetType(GridInkEditor)
        End If
    End Sub
End Class

You can download a VB and C# project from the following link.