Manipulating TreeView controls programmatically

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

Overview
Initializing a TreeView control
Populating a TreeView control
WLanguage properties of TreeView controls
Using properties on a TreeView control

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Manipulating TreeView controls programmatically

Overview

WINDEV and WEBDEV allow you to programmatically manipulate TreeView controls. 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 programmatically manipulate TreeView controls.

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 manipulate an element found in a TreeView control programmatically. 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(ARBRE_RecetteTV, "Recette" + TAB + "Dessert", "GATEAU-.BMP", "GATEAU-.BMP")
TreeAdd(ARBRE_RecetteTV ,"Recette" + TAB + "Dessert" + TAB + "Glace")
TreeAdd(ARBRE_RecetteTV, "Recette" + TAB + "Dessert" + TAB + "Glace" + TAB + ...
		"Vanille", "SUIVAN5-.BMP")
TreeAdd(ARBRE_RecetteTV, "Recette" + TAB + "Dessert" + TAB + "Glace" + TAB + ...
		"Fraise", "SUIVAN5-.BMP")
TreeAdd(ARBRE_RecetteTV, "Recette" + TAB + "Dessert" + TAB + "Glace" + TAB + ...
		"Chocolat", "SUIVAN5-.BMP")
TreeAdd(ARBRE_RecetteTV, "Recette" + TAB + "Dessert" + TAB + "Coupe")
TreeAdd(ARBRE_RecetteTV, "Recette" + TAB + "Dessert" + TAB + "Coupe" + TAB + ...
		"Pêche Melba", "SUIVAN5-.BMP")
TreeAdd(ARBRE_RecetteTV, "Recette" + TAB + "Dessert" + TAB + "Coupe" + TAB + ...
		"Poire belle hélène", ...
	"SUIVAN5-.BMP")
TreeAdd(ARBRE_RecetteTV, "Recette" + TAB + "Dessert" + TAB + "Coupe" + TAB + ...
		"Colonel", "SUIVAN5-.BMP")
TreeAdd(ARBRE_RecetteTV, "Recette" + TAB + "Dessert" + TAB + "Tarte aux pommes")
TreeAdd(ARBRE_RecetteTV, "Recette" + TAB + "Dessert" + TAB + "Tarte aux pommes" + TAB + ...
	"à la crème fraîche", "SUIVAN5-.BMP")
TreeAdd(ARBRE_RecetteTV, "Recette" + TAB + "Dessert" + TAB + "Tarte aux pommes" + TAB + ...
	"au calvados", "SUIVAN5-.BMP")
TreeAdd(ARBRE_RecetteTV, "Recette" + TAB + "Dessert" + TAB + "Crème brûlée", ...
	 "SUIVAN5-.BMP")
TreeAdd(ARBRE_RecetteTV, "Recette" + TAB + "Dessert" + TAB + "Vacherin", ...
	"SUIVAN5-.BMP")
TreeExpand(ARBRE_RecetteTV, "Recette")

Note: To optimize the filling of a TreeView control, you can use the AddChildDelayed property on the TreeView control rows.. 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 of TreeView controls

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

Using properties on a TreeView control

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

Trace(ARBRE_MonArbre.Occurrence)

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

ARBRE_MonArbre.PoliceTaille = 14