Handling a TreeView control through programming

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Help / Developing an application or site / Controls, windows and pages / Controls: Available types / TreeView control

Overview
Initializing a TreeView control
Populating a TreeView control
WLanguage properties associated with the TreeView controls
Using properties on a TreeView control

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Handling a TreeView control through programming

Overview

WINDEV and WEBDEV allow you to handle a TreeView control through programming. To do so, use the variable of the TreeView control in the code.

The variable of the TreeView control corresponds to the name of the TreeView control.

This help page explains how to handle a TreeView control through programming.

Remarks:

Several WLanguage functions are specific to the management of TreeView controls. For more details, see the functions for managing TreeView controls.
You also have the ability to handle an element found in a TreeView control through programming. For more details, see Handling an element of a TreeView control programmatically.
A TreeView control can also be linked to a data file or variable.

Initializing a TreeView control

Populating a TreeView control

To initialize a TreeView control, all you have to do is describe all the treeview elements with TreeAdd.

TreeAdd(TREE_TVRecipe, "Recipe" + TAB + "Dessert", "CAKE-.BMP", "CAKE-.BMP")
TreeAdd(TREE_TVRecipe ,"Recipe" + TAB + "Dessert" + TAB + "Ice cream")
TreeAdd(TREE_TVRecipe, "Recipe" + TAB + "Dessert" + TAB + "Ice cream" + TAB + ...
"Vanilla", "NEXT5-.BMP")
TreeAdd(TREE_TVRecipe, "Recipe" + TAB + "Dessert" + TAB + "Ice cream" + TAB + ...
"Strawberry", "NEXT5-.BMP")
TreeAdd(TREE_TVRecipe, "Recipe" + TAB + "Dessert" + TAB + "Ice cream" + TAB + ...
"Chocolate", "NEXT5-.BMP")
TreeAdd(TREE_TVRecipe, "Recipe" + TAB + "Dessert" + TAB + "Cup")
TreeAdd(TREE_TVRecipe, "Recipe" + TAB + "Dessert" + TAB + "Cup" + TAB + ...
"Peach Melba", "NEXT5-.BMP")
TreeAdd(TREE_TVRecipe, "Recipe" + TAB + "Dessert" + TAB + "Cup" + TAB + ...
"Cherry Garcia", ...
"NEXT5-.BMP")
TreeAdd(TREE_TVRecipe, "Recipe" + TAB + "Dessert" + TAB + "Cup" + TAB + ...
"Colonel", "NEXT5-.BMP")
TreeAdd(TREE_TVRecipe, "Recipe" + TAB + "Dessert" + TAB + "Apple pie")
TreeAdd(TREE_TVRecipe, "Recipe" + TAB + "Dessert" + TAB + "Apple pie" + TAB + ...
"with whipped cream", "NEXT5-.BMP")
TreeAdd(TREE_TVRecipe, "Recipe" + TAB + "Dessert" + TAB + "Apple pie" + TAB + ...
"with apple brandy", "NEXT5-.BMP")
TreeAdd(TREE_TVRecipe, "Recipe" + TAB + "Dessert" + TAB + "Crème brûlée", ...
"NEXT5-.BMP")
TreeAdd(TREE_TVRecipe, "Recipe" + TAB + "Dessert" + TAB + "Meringue with cream", ...
"NEXT5-.BMP")
TreeExpand(TREE_TVRecipe, "Recipe")

Remark: To properly fill a TreeView control, you can use the AddChildDelayed property on the rows of the TreeView control. This property is used to define the procedure that will be run to fill the level to expand. The search for children and the fill of children are performed only when the user wants to see them.

WLanguage properties associated with the TreeView controls

Several WLanguage properties can be used on the TreeView control. For a complete list of WLanguage properties that can be used with a TreeView control, see Properties associated with TreeView controls.

Using properties on a TreeView control

Example: How to find out the number of elements in a TreeView control:

Trace(TREE_MyTreeView.Count)

Example: How to modify the size of the font for all the elements of a TreeView control:

TREE_MyTreeView.FontSize = 14