Scrollbar Annotation Behavior

Jul 05, 2019

Overview

You can display scrollbar annotations in a list box control to indicate the following items’ location:

focused item
selected items
checked items (the checked list box control only)
items corresponding to a search query (a search control should be attached to the list box control)

Supported Controls

Options

Type — a set of flags that specify the enabled annotation types
Color — the annotation color (the default value depends on the current skin)
Alignment — the annotation alignment (the default value depends on the current skin)

How to Attach the Behavior in Code

The code below shows how to enable scrollbar annotations for focused and selected rows in an image list box.

C#
VB.NET

csharp

using DevExpress.Utils.Behaviors;

behaviorManager1.Attach<ScrollAnnotationsBehavior>(imageListBoxControl1, behavior => {
    behavior.Properties.Type = ScrollAnnotationType.Focus | ScrollAnnotationType.Selection;
});

Imports DevExpress.Utils.Behaviors

behaviorManager1.Attach(Of ScrollAnnotationsBehavior)(imageListBoxControl1, Sub(behavior)
    behavior.Properties.Type = ScrollAnnotationType.Focus Or ScrollAnnotationType.Selection
End Sub)

Tip

You can handle the BaseListBoxControl.CustomDrawScroll event to draw custom annotations for specific scrollbar positions.