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.NET and JavaScript UI Controls
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Lasso Selection Support

The phrase “Lasso Selection” refers to the selection rectangle that is dragged by the end user around one or more items in the view, resulting in them being selected. This feature is similar to the Windows Explorer style selection, which allows dragging selection of multiple items, which is now available with the WinListView™ control. The drag operation is initiated when the user presses the left or right mouse button while the cursor is positioned over an area of the control that does not contain an item. As the cursor is moved, the selection rectangle is updated to include the area from the original drag point and the current cursor position. Any items whose bounds intersect with this rectangle are selected.

The Lasso select effect can be enabled by simply setting the LassoSelectMode property of the UltraListViewItemSettings class to any of the mouse buttons like LeftMouseButton, RightMouseButton or LeftAndRightMouseButtons. Also, to get this effect the UltraListView.ItemSettings.SelectionType property must be set to ‘Extended’.

Note
Note

When the View property of ultraListView is set to Details and ViewSettingsDetails.FullRowSelect is set to true, lasso selection will be supported but will be difficult to utilize it. For an easier way of selection, the FullRowSelect property can be set to false.

In Visual Basic:

'Load data into the 'northwindDataSet.Customers' table.
Me.customersTableAdapter.Fill(Me.northwindDataSet.Customers)
For i As Integer = 0 To Me.northwindDataSet.Tables("Customers").Rows.Count- 1
     Dim row As DataRow = Me.northwindDataSet.Tables("Customers").Rows(i)
     ' Break out the field values for this row
     Dim customerID As String = TryCast(row("CustomerID"), String)
     Dim companyName As String = TryCast(row("CompanyName"), String)
     'Adding Items to the ultraListView
     Me.ultraListView1.Items.Add(customerID, companyName)
     ' Allow extended selection for items
     Me.ultraListView1.ItemSettings.SelectionType = SelectionType.Extended
     'Setting LeftMouseButton to perform Lasso Selection
      ultraListView1.ItemSettings.LassoSelectMode= LassoSelectMode.LeftMouseButton
Next

In C#:

//Load data into the 'northwindDataSet.Customers' table.
this.customersTableAdapter.Fill(this.northwindDataSet.Customers);
for (int i = 0; i < this.northwindDataSet.Tables["Customers"].Rows.Count; i++)
 {
     DataRow row = this.northwindDataSet.Tables["Customers"].Rows[i];
     // Break out the field values for this row
     string customerID = row["CustomerID"] as string;
     string companyName = row["CompanyName"] as string;
     //Adding Items to the ultraListView
     this.ultraListView1.Items.Add(customerID, companyName);
     //Allow extended selection for items
     this.ultraListView1.ItemSettings.SelectionType = SelectionType.Extended;
     //Setting LeftMouseButton to perform Lasso Selection
     ultraListView1.ItemSettings.LassoSelectMode = LassoSelectMode.LeftMouseButton;
  }