SAMPLE: Manipulating and Saving the Nodes in a TreeView Control

• Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, version 5.0

SUMMARY

This sample illustrates how to manipulate nodes with the TreeView control. It also illustrates how to save the node information to an Access database, and then restore them. Additionally, this sample implements the drag-and- drop feature for TreeView control nodes.

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The following file is available for download from the Microsoft Software Library:

 ~ Treeview.exe (size: 29611 bytes) 

   ARTICLE-ID: Q119591
   TITLE     : How to Obtain Microsoft Support Files from Online Services

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The purpose of this TreeView sample is to demonstrate the basics of using and manipulating the TreeView control. This example shows how to add Nodes using the five different relationship settings of the Nodes Collection Add Method. It will also allow you to remove a selected Node or branch.

The main focus of the example is to show how to save and restore the Nodes into an Access Database. The algorithm that you use saves the Nodes in viewing order. This allows you to save and restore the TreeView control with the Nodes in the same order as they appeared to the user when the user closed the application.

The sample also shows how to drag and drop Nodes. You can also drag and drop a Node on top of a different Node so that the dragged Node is now the child of the Node it was dropped on.

For more information on the TreeView control please see Help or page 453 of the Professional Features Custom Control Reference.

To use this sample, open Treeview.vbp in the VB IDE and press the F5 key or choose Start from the Run menu.

The following files are included with this sample.

Readme.txt Treeview.vbp Bldtree.frm Bldtree.frx

(c) Microsoft Corporation 1997, All Rights Reserved. Contributions by Brian Combs, Microsoft Corporation