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     TreeListNodesIterator Members
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 End-User Documentation
View this topic on docs.devexpress.com (Learn more)

TreeListNodesIterator.DoVisibleNodesOperation Method

Performs the specified operation over a range of nodes that are not hidden within collapsed groups.

Namespace:DevExpress.XtraTreeList.Nodes.Operations
Assembly:DevExpress.XtraTreeList.v19.2.dll

Expanded Syntax

Parameters

operation
Type: TreeListVisibleNodeOperation
A TreeListVisibleNodeOperation descendant that specifies the operation to be performed.
visibleNodeFrom
Type: TreeListNode
A TreeListNode object representing the node from which the iteration begins.
visibleNodeTo
Type: TreeListNode
A TreeListNode object representing the node at which the iteration ends.

Expanded Remarks

Use the DoVisibleNodesOperation method to traverse through the visible nodes in a specified range. The range of processed nodes is specified by the visibleNodeFrom and visibleNodeTo parameters. If at least one of these parameters represents a node hidden within a collapsed group, no iteration is performed. If these parameters represent the same node, the method performs the specified operation over this node.

The operation performed over the range of nodes is specified by a TreeListVisibleNodeOperation descendant passed as the operation parameter. It is up to you to create the desired descendant and implement the operation logic. Please see the TreeListVisibleNodeOperation class description for details on how to create a custom operation.

For visited nodes the TreeListOperation.Execute method is called if the TreeListOperation.CanContinueIteration property returns True.

Expanded See Also

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