TreeListOptionsBehavior.HyperlinkClickMode Property

Gets or sets whether and how hyperlinks in column and band headers are activated.

Namespace: DevExpress.XtraTreeList

Assembly: DevExpress.XtraTreeList.v24.2.dll

Declaration

C#

[DefaultValue(HyperlinkClickMode.Default)]
[XtraSerializableProperty]
public virtual HyperlinkClickMode HyperlinkClickMode { get; set; }

VB.NET

<DefaultValue(HyperlinkClickMode.Default)>
<XtraSerializableProperty>
Public Overridable Property HyperlinkClickMode As HyperlinkClickMode

Property Value

Type	Default	Description
HyperlinkClickMode	Default	A value that specifies whether and how hyperlinks in column and band headers are activated.

Available values:

Name	Description
Default	The same as the None option.
CtrlClick	A hyperlink is activated on a mouse click when the CTRL key is pressed down.
Click	A hyperlink is activated on a mouse click.
None	Do not activate a hyperlink on a mouse pointer hover or click event.

Property Paths

You can access this nested property as listed below:

Object Type	Path to HyperlinkClickMode
TreeList	.OptionsBehavior .HyperlinkClickMode

Remarks

You can use HTML tags to insert hyperlinks in column headers (TreeListColumn.Caption) and band headers (TreeListBand.Caption). See TreeListOptionsView.AllowHtmlDrawHeaders for information on how to enable these tags.

The default behavior is to display hyperlinks, but restrict their activation on mouse events. Set the control’s HyperlinkClickMode property to one of the following values to allow users to activate hyperlinks:

• Click value — A hyperlink is activated on a mouse click.
• CtrlClick value — A hyperlink is activated on a mouse click when the CTRL key is pressed down.

Hyperlinks are never activated if the HyperlinkClickMode property is set to Default or None.

Handle the TreeList.HyperlinkClick event to perform actions on hyperlink activation.

Example

The following example displays a hyperlink in the header of the ‘Change’ Tree List column. The TreeList.HyperlinkClick event is handled to respond to a link click — which toggles the display mode of this column’s values.

C#

private void Form1_Load(object sender, EventArgs e) {
    BindingList<Ticker> list = new BindingList<Ticker>();
    list.Add(new Ticker() { Symbol = "AVR", Price = 101.4m, AbsoluteChange = 2.3m });
    list.Add(new Ticker() { Symbol = "RVA", Price = 414.1m, AbsoluteChange = 3.2m });
    list.Add(new Ticker() { Symbol = "ARBV", Price = 532.7m, AbsoluteChange = -18.0m });

    treeList1.DataSource = list;
    treeList1.OptionsView.AllowHtmlDrawHeaders = true;
    treeList1.OptionsBehavior.HyperlinkClickMode = DevExpress.Utils.Drawing.HyperlinkClickMode.CtrlClick;
    treeList1.HyperlinkClick += TreeList1_HyperlinkClick; ;

    treeList1.Columns["AbsoluteChange"].Visible = false;
    treeList1.Columns["PercentageChange"].Visible = false;

    TreeListColumn changeColumn = treeList1.Columns.AddVisible("Change");
    changeColumn.UnboundDataType = typeof(decimal);
    changeColumn.OptionsColumn.AllowEdit = false;
    updateChangeColumnDisplayMode();

    treeList1.Columns["Price"].Format.FormatType = DevExpress.Utils.FormatType.Numeric;
    treeList1.Columns["Price"].Format.FormatString = "c2";
}

bool usePercentageFormat = false;

private void TreeList1_HyperlinkClick(object sender, DevExpress.XtraTreeList.TreeListHyperlinkClickEventArgs e) {
    if (e.Link == "toggle-display-mode") {
        usePercentageFormat = !usePercentageFormat;
        updateChangeColumnDisplayMode();
    }
}

void updateChangeColumnDisplayMode() {
    TreeListColumn column = treeList1.Columns["Change"];
    if (column == null) return;
    column.Format.FormatType = DevExpress.Utils.FormatType.Numeric;
    if (usePercentageFormat) {
        column.Caption = "Change <a href=toggle-display-mode>(%)</a>";
        column.Format.FormatString = "p2";
        // Display values from the PercentageChange field.
        column.UnboundExpression = "PercentageChange";
    }
    else {
        column.Caption = "Change <a href=toggle-display-mode>($)</a>";
        column.Format.FormatString = "c2";
        // Display values from the AbsoluteChange field.
        column.UnboundExpression = "AbsoluteChange";
    }
}

public class Ticker {
    public string Symbol { get; set; }
    public decimal Price { get; set; }
    public decimal AbsoluteChange { get; set; }
    public decimal PercentageChange {
        get {
            if (Price > 0) return AbsoluteChange / Price;
            else return 0;
        }
    }
}

VB.NET

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Dim list As New BindingList(Of Ticker)()
    list.Add(New Ticker() With {
        .Symbol = "AVR",
        .Price = 101.4D,
        .AbsoluteChange = 2.3D
    })
    list.Add(New Ticker() With {
        .Symbol = "RVA",
        .Price = 414.1D,
        .AbsoluteChange = 3.2D
    })
    list.Add(New Ticker() With {
        .Symbol = "ARBV",
        .Price = 532.7D,
        .AbsoluteChange = -18D
    })

    TreeList1.DataSource = list
    TreeList1.OptionsView.AllowHtmlDrawHeaders = True
    TreeList1.OptionsBehavior.HyperlinkClickMode = DevExpress.Utils.Drawing.HyperlinkClickMode.CtrlClick
    AddHandler TreeList1.HyperlinkClick, AddressOf TreeList1_HyperlinkClick

    TreeList1.Columns("AbsoluteChange").Visible = False
    TreeList1.Columns("PercentageChange").Visible = False

    Dim changeColumn As TreeListColumn = TreeList1.Columns.AddVisible("Change")
    changeColumn.UnboundDataType = GetType(Decimal)
    changeColumn.OptionsColumn.AllowEdit = False
    updateChangeColumnDisplayMode()

    TreeList1.Columns("Price").Format.FormatType = DevExpress.Utils.FormatType.Numeric
    TreeList1.Columns("Price").Format.FormatString = "c2"
End Sub

Private usePercentageFormat As Boolean = False

Private Sub TreeList1_HyperlinkClick(sender As Object, e As TreeListHyperlinkClickEventArgs)
    If e.Link = "toggle-display-mode" Then
        usePercentageFormat = Not usePercentageFormat
        updateChangeColumnDisplayMode()
    End If
End Sub

Private Sub updateChangeColumnDisplayMode()
    Dim column As TreeListColumn = TreeList1.Columns("Change")
    If column Is Nothing Then
        Return
    End If
    column.Format.FormatType = DevExpress.Utils.FormatType.Numeric
    If usePercentageFormat Then
        column.Caption = "Change <a href=toggle-display-mode>(%)</a>"
        column.Format.FormatString = "p2"
        ' Display values from the PercentageChange field.
        column.UnboundExpression = "PercentageChange"
    Else
        column.Caption = "Change <a href=toggle-display-mode>($)</a>"
        column.Format.FormatString = "c2"
        ' Display values from the AbsoluteChange field.
        column.UnboundExpression = "AbsoluteChange"
    End If
End Sub

Public Class Ticker
    Public Property Symbol() As String
    Public Property Price() As Decimal
    Public Property AbsoluteChange() As Decimal
    Public ReadOnly Property PercentageChange() As Decimal
        Get
            If Price > 0 Then
                Return AbsoluteChange / Price
            Else
                Return 0
            End If
        End Get
    End Property
End Class