We recommend that you use the xamDataGrid control instead of the xamGrid control. The xamGrid is being planned for retirement over the next few years and will not receive any new features. We will continue to provide support and critical bug fixes for the xamGrid during this time. For help or questions on migrating your codebase to the xamDataGrid, please contact support.
This section will show you how to auto expand data rows as well as the child band header rows of the xamGrid™ control..
The xamGrid control allows you to auto expand data rows as well as ChildBand header rows by setting their IsExpanded property to True. This topic will show you how to use the xamGrid control’s RowExpansionChanged event to auto-expand data rows as well as the ChildBand header rows.
The following code assumes that you know how to set up your WPF project for the xamGrid control.
Add the following namespace declarations.
In XAML:
xmlns:ig="http://schemas.infragistics.com/xaml"
In Visual Basic:
Imports Infragistics.Controls.Grids Imports Infragistics.Controls.Grids.Primitives
In C#:
using Infragistics.Controls.Grids; using Infragistics.Controls.Grids.Primitives;
Add the xamGrid control along with the event handler for the RowExpansionChanged event and set the control’s ColumnLayoutHeaderVisibility property to Always.
In XAML:
<ig:XamGrid x:Name="xamGrid" ColumnLayoutHeaderVisibility="Always"
RowExpansionChanged="xamGrid_RowExpansionChanged"
ItemsSource="{Binding Source={StaticResource DataUtil}, Path=CategoriesAndProducts}" />
In Visual Basic:
Private xamGrid As XamGrid ' ... InitializeComponent() ' ... xamGrid = New XamGrid() xamGrid.ColumnLayoutHeaderVisibility = ColumnLayoutHeaderVisibility.Always xamGrid.ItemsSource = DataUtil.CategoriesAndProducts AddHandler xamGrid.RowExpansionChanged, AddressOf xamGrid_RowExpansionChanged Me.LayoutRoot.Children.Add(xamGrid)
In C#:
private XamGrid xamGrid; //... InitializeComponent(); // ... xamGrid = new XamGrid(); xamGrid.ColumnLayoutHeaderVisibility = ColumnLayoutHeaderVisibility.Always; xamGrid.RowExpansionChanged += xamGrid_RowExpansionChanged; xamGrid.ItemsSource = DataUtil.CategoriesAndProducts; this.LayoutRoot.Children.Add(xamGrid);
Add the following method for auto-expanding a Row object.
In Visual Basic:
Private Sub AutoExpandAllChildRows(ByVal parentRow As Row)
For Each cb As ChildBand In parentRow.ChildBands
cb.IsExpanded = True
If cb.HasChildren Then
AutoExpandAllChildBands(cb)
End If
Next
End Sub
In C#:
private void AutoExpandAllChildRows(Row parentRow)
{
foreach (ChildBand cb in parentRow.ChildBands)
{
cb.IsExpanded = true;
if (cb.HasChildren)
AutoExpandAllChildBands(cb);
}
}
Add the following method for auto-expanding a ChildBand object
In Visual Basic:
Private Sub AutoExpandAllChildBands(ByVal parentBand As ChildBand)
For Each r As Row In parentBand.Rows
r.IsExpanded = True
If r.HasChildren Then
AutoExpandAllChildRows(r)
End If
Next
End Sub
In C#:
private void AutoExpandAllChildBands(ChildBand parentBand)
{
foreach (Row r in parentBand.Rows)
{
r.IsExpanded = true;
if (r.HasChildren)
AutoExpandAllChildRows(r);
}
}
Add a Boolean AutoExpanding flag and implement the event handler for the xamGrid control’s RowExpansionChanged event.
In Visual Basic:
Private AutoExpanding As Boolean = False
' ...
Private Sub xamGrid_RowExpansionChanged(ByVal sender As System.Object, ByVal e As RowExpansionChangedEventArgs)
If Not AutoExpanding Then
' expand child rows only if parent row is expaned
If e.Row.IsExpanded Then
AutoExpanding = True
If (e.Row.RowType = RowType.DataRow) Then
AutoExpandAllChildRows(TryCast(e.Row, Row))
End If
If (e.Row.RowType = RowType.ColumnLayoutHeaderRow) Then
AutoExpandAllChildBands(TryCast(e.Row, ChildBand))
End If
AutoExpanding = False
End If
End If
End Sub
In C#:
private bool AutoExpanding = false;
// ...
private void xamGrid_RowExpansionChanged(object sender, RowExpansionChangedEventArgs e)
{
if (!AutoExpanding)
{
// expand child rows only if parent row is expanded
if (e.Row.IsExpanded)
{
AutoExpanding = true;
if (e.Row.RowType == RowType.DataRow)
AutoExpandAllChildRows((Row)e.Row);
if (e.Row.RowType == RowType.ColumnLayoutHeaderRow)
AutoExpandAllChildBands((ChildBand)e.Row);
AutoExpanding = false;
}
}
}
Run the application. All child Rows as well as ChildBand objects of the xamGrid control will auto expand whenever the RowExpansionChanged event occurs.