Handling an element of a TreeView control by programming

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Handling an element of a TreeView control by programming

Overview

Handling the elements of a TreeView control directly

Initializing an element in a TreeView control

Selecting an element in a TreeView control

Retrieving the element selected in the TreeView control

WLanguage properties associated with the elements of a TreeView control

Associating an image with the elements of a TreeView control

Events associated with TreeView controls

Handling a TreeView control at run time

Handling a TreeView control by programming

Handling a TreeView control by programming (prefixed syntax)

Handling an element found in a TreeView control by programming (prefixed syntax)

Handling an element of a TreeView control by programming

How to fill a TreeView control from a data file? (prefixed syntax)

How to fill a Treeview control from a data file?

Managing duplicates in the TreeView controls

Managing duplicates in the TreeView controls (prefixed syntax)

Properties associated with the TreeView control

Properties associated with the rows of a TreeView control

The TreeView control

TreeView control linked to a data file

Winding/unrolling a TreeView control by programming

Winding/unrolling a TreeView control by programming (prefixed syntax)

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 the element of row whose subscript is
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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Handling an element of a TreeView control by programming

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 the 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:

"<Name of root>" + 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 handle an element of a TreeView control directly (with the WLanguage properties for example), two notations are available:

Operation performed via the subscript of the element:
All you have to do is use the following notation: <Name of TreeView control> [ <Element subscript>].
Caution: The specified subscripts only take the visible elements into account.
Example: Modifying 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:
All you have to do is use the following notation: <Name of TreeView control> [ <Element path>].
The path of the element is a character string in the following format:

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

Example: Modifying the color of the "Pineapple" element.

TREE_MyTreeView["Recipe" + TAB + "Dessert" + TAB + "Pineapple"]..Color = LightRed

Remark: You also have the ability to use the following notation to identify the current element in 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),
..ToolTip applied to the requested element.

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

Reminder: By default, the tooltip associated with the different controls is displayed. To specify whether the tooltips must be displayed or not, use ShowToolTip.

Selecting an element in a TreeView control

Selecting the element of row whose subscript is <Subscript>

To select the element found at <Subscript> row, use:

the direct assignment:

<Name of TreeView control> = Subscript

If the row is displayed in the TreeView control, the corresponding element is selected.
TreeSelectPlus:

TreeSelectPlus(<Name of TreeView control>, <Full element name>)

Positioning on the last element of the TreeView control

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

<Name of TreeView control> = <Name of TreeView control>..Count

Retrieving the element selected in the TreeView control

To retrieve:

the subscript of the selected element, use the direct reading of the element:

Subscript = <Name of TreeView control>
the full path of the selected element, use TreeSelect:

<Path> = TreeSelect(<Name of 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.

To find out the entire 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