BaseRow.AllowCollapse Property

Gets or sets whether users can click the header or collapse button to collapse the row.

Namespace: DevExpress.XtraVerticalGrid.Rows

Assembly: DevExpress.XtraVerticalGrid.v21.2.dll

Declaration

C#

[DefaultValue(DefaultBoolean.Default)]
[DXCategory("Behavior")]
[XtraSerializableProperty]
public DefaultBoolean AllowCollapse { get; set; }

VB.NET

<DXCategory("Behavior")>
<DefaultValue(DefaultBoolean.Default)>
<XtraSerializableProperty>
Public Property AllowCollapse As DefaultBoolean

Property Value

Type	Default	Description
DefaultBoolean	Default	True if users can collapse the row; False if not; Default if this functionality depends on the control’s AllowCollapseRows option.

Available values:

Name	Description
True	true. DefaultBoolean.True has a constant value of 0, while the standard true value corresponds to a value of 1. In Visual Basic, do not use implicit conversion of Boolean values to DefaultBoolean, and vice versa, as the conversion may produce incorrect results.
False	false. DefaultBoolean.False has a constant value of 1, while the standard false value corresponds to a value of 0. In Visual Basic, do not use implicit conversion of Boolean values to DefaultBoolean, and vice versa, as the conversion may produce incorrect results.
Default	The default behavior determined by the control’s logic.

Remarks

You can group rows into categories and display rows as children of other rows. See the following topic for more information on how to create categories and nested rows: Rows.

Users can click the collapse/expand button in a category or row, double-click a category or row header, or press the plus (+) or minus (-) sign on the numeric keypad to collapse or expand a category or row.

Disable the control’s AllowCollapseRows option to prohibit users from collapsing rows. You can also use a row’s AllowCollapse property to override this setting for an individual row.

Disable the control’s ShowCollapseButtons option to hide collapse/expand buttons. You can also use a row’s ShowCollapseButton property to hide the buttons in an individual row. If users are not allowed to collapse rows, the buttons are not displayed regardless of these settings.

The code below allows users to collapse all rows except a specific row.

C#

using DevExpress.Utils;

vGridControl1.OptionsBehavior.AllowCollapseRows = true;
rowAddress.AllowCollapse = DefaultBoolean.False;

vGridControl1.OptionsView.ShowCollapseButtons = true;
rowAddress.ShowCollapseButton = DefaultBoolean.False;

VB.NET

Imports DevExpress.Utils

vGridControl1.OptionsBehavior.AllowCollapseRows = True
rowAddress.AllowCollapse = DefaultBoolean.False

vGridControl1.OptionsView.ShowCollapseButtons = True
rowAddress.ShowCollapseButton = DefaultBoolean.False

The control raises the RowCollapsing, RowCollapsed, RowExpanding, and RowExpanded events before and after the corresponding operation. Use the Row event argument to determine the processed row. You can set the Cancel argument to true to discard an operation before it is completed.

The handler below prohibits users from collapsing a row if a specific record is focused.

C#

private void vGridControl1_RowCollapsing(object sender, DevExpress.XtraVerticalGrid.Events.RowCollapsingEventArgs e) {
    VGridControl gridControl = sender as VGridControl;
    if (e.Row == rowAddress && gridControl.FocusedRecord == 0)
        e.Cancel = true;
}

VB.NET

Private Sub vGridControl1_RowCollapsing(ByVal sender As Object, ByVal e As Events.RowCollapsingEventArgs)
    Dim gridControl As VGridControl = TryCast(sender, VGridControl)
    If e.Row Is rowAddress AndAlso gridControl.FocusedRecord = 0 Then e.Cancel = True
End Sub