Handling an element of a TreeView control programmatically

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

Overview
Handling the elements of a TreeView control directly
WLanguage functions
Direct operation
Initializing an element in a TreeView control
Initializing an element
Associating a tooltip with an element
Selecting an element in a TreeView control
Selecting an element at row
Positioning on the last element of the TreeView control
Retrieving the element selected in the TreeView control
WLanguage properties associated with the elements of a TreeView control
Using properties on an element of a TreeView control
Examples

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See also

Handling an element of a TreeView control programmatically

Overview

This help page explains how to handle the elements of a TreeView control either directly or via the WLanguage functions.

You can:

Handling an element of a TreeView control,
Initializing an element in a TreeView control,
Selecting an element in a TreeView control,
Retrieving the element selected in the TreeView control,
Use the WLanguage properties on an element of a Treeview control.

Handling the elements of a TreeView control directly

WLanguage functions

In the WLanguage functions for managing TreeView controls, the element of the TreeView control is handled via its full path (from the root of the TreeView control). This path has the following format:

"<Root name>" + TAB + ["<Name of 1st node>" + TAB + ...
["<Name of 2nd node>" + TAB + [...]]]"<Leaf name>"

The different elements that constitute the path of characters strings are separated by TAB characters.

Direct operation

To manipulate an element of a TreeView control directly (with the WLanguage properties for example), two notations are available:

Operation performed via the index of the element:
Just use the following notation: <Tree Field> [ <Item Index>].
Please note: The specified indices only take into account visible elements..
Example: Changing the color of the 5th element displayed in a TreeView control:
TREE_MyTreeView[5].Color = LightRed
Operation performed via the full path of the element:
Just use the following notation: <Tree Field> [ <Element Path>].
The path of the element is a character string in the following format:
"<Root name>" + TAB + ["<Name of 1st node>" + TAB + ...
["<Name of 2nd node>" + TAB + [...]]]"<Leaf name>"
Example: Changing the color of the "Pineapple" element.
TREE_MyTreeView["Recipe" + TAB + "Dessert" + TAB + "Pineapple"].Color = LightRed

Note: It is also possible to use the following notation to designate the current element of a TreeView control:

MySelf[TreeSelect(MySelf)]

Initializing an element in a TreeView control

Initializing an element

To initialize an element found in a TreeView control, use TreeAdd.

During this addition, you can:

Associating a tooltip with an element

To associate a tooltip with an element in a Treeview control, you can use:

the WLanguage functions used to add or modify an element of a TreeView control (TreeAdd, TreeInsert, TreeModify),
the ToolTip property on the desired element.

If the element's tooltip text is not specified, the text displayed will be that of the TreeView control's tooltip (if it exists).

Reminder: By default, the tooltips associated with the various fields are displayed.. To specify whether the tooltips must be displayed or not, use ShowToolTip.

Selecting an element in a TreeView control

Selecting an element at row <Index>

To select the element at row <Index>, use:

direct assignment:
<TreeView control> = Index

If the row is displayed in the TreeView control, the corresponding element is selected.
the TreeSelectPlus function:
TreeSelectPlus(<TreeView control>, <Full element name>)

Positioning on the last element of the TreeView control

To set the position on the last element of the TreeView control, use the Count property:

<TreeView control> = <TreeView control>.Count

Retrieving the element selected in the TreeView control

To retrieve:

the index of the selected element, use the direct reading of the element:
Index = <TreeView control>
the full path of the selected element, use TreeSelect:
<Path> = TreeSelect(<TreeView control>)
the identifier of the selected element, use TreeIdentifier.

WLanguage properties associated with the elements of a TreeView control

Using properties on an element of a TreeView control

Several WLanguage properties can be used on the elements of a TreeView control.

For a complete list of WLanguage properties that can be used on an element of a TreeView control, see Properties associated with a row of a TreeView control.

Examples

Example: How to modify the color of an element in a TreeView control:

TREE_MyTreeView[5].Color = LightRed

Example: How to modify the size of the font used for an element of a TreeView control:

TREE_MyTreeView["Recipe" + TAB + "Dessert" + TAB + "Pineapple"].FontSize = 14