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- TreeAdd function: Adding an element at any position
- Code samples
- TreeInsert function: Inserting an element at a specific position
- Code example
How to fill a TreeView control?
A TreeView control is used to represent data hierarchically (on several levels). For example, a TreeView control can represent products groupd by Family then Sub-family. To populate a TreeView control programmatically, you must use: TreeAdd function: Adding an element at any position TreeAdd is used to add an element into a TreeView control. An element is made of: - Root: represents the first level of the element
- Branch(es): represents the intermediate level(s)
- Leaf: represents the data to classify
An element is represented in the following format:
Root + TAB + Branch 1 + TAB + Branch 2 + TAB + ... + TAB + Leaf
The syntax of TreeAdd is as follows:
TreeAdd(<TreeView name>, <Element>, <Collapsed image>, <Expanded image>, <Identifier>)
For more details, see the help page on the TreeAdd function. Code samples - Fill through programming:
TreeAdd(TREE_City, "France")
TreeAdd(TREE_City, "Italy")
TreeAdd(TREE_City, "France" + TAB + "Paris")
TreeAdd(TREE_City, "France" + TAB + "Marseille")
TreeAdd(TREE_City, "France" + TAB + "Lyon")
TreeAdd(TREE_City, "France" + TAB + "Montpellier")
TreeAdd(TREE_City, "Italy" + TAB + "Rome")
TreeAdd(TREE_City, "Italy" + TAB + "Pisa")
TreeAdd(TREE_City, "Italy" + TAB + "Milan")
TreeAdd(TREE_City, "Spain" + TAB + "Barcelona")
TreeAdd(TREE_City, "Spain" + TAB + "Madrid")
TreeAdd(TREE_City, "Spain" + TAB + "Valence")
- Fill from a data file:
// Read families
FOR EACH Family
// Add the family into the treeview (level 1: root)
TreeAdd(TREE_Products, Family.Caption)
// Read sub-families
FOR EACH SubFam WITH FamilyID = Family.FamilyID
// Add the sub-family (level 2: branch 1)
TreeAdd(TREE_Products, Family.Caption + TAB + SubFam.Caption)
// Read products
FOR EACH PRODUCT WITH SubsFamID = SubFam.SubFamID
// Add the product: (leaf)
TreeAdd(TREE_Products,
Family.Caption + TAB + SubFam.Caption + TAB + PRODUCT.ProdCap)
END
END
END
TreeInsert function: Inserting an element at a specific position TreeInsert is used to insert a leaf in relation to another leaf (brother leaf).
TreeInsert(<TreeView name>, <Brother leaf>, <New leaf>,
<Collapsed image>, <Expanded image>, <Identifier>)
For more details, see the help page on the TreeInsert function. Code example
TreeAdd(TREE_City, "France")
TreeAdd(TREE_City, "Italy")
TreeAdd(TREE_City, "France" + TAB + "Paris")
TreeAdd(TREE_City, "France" + TAB + "Marseille")
TreeAdd(TREE_City, "France" + TAB + "Lyon")
// Inserts the cities of Montpellier and Bordeaux on the same level as Lyon
TreeInsert(TREE_City, "France" + TAB + "Lyon", "Montpellier")
TreeInsert(TREE_City, "France" + TAB + "Lyon", "Bordeaux")
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