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 End-User Documentation

TaskbarAssistant Class

Provides methods to manipulate an application taskbar button, Jump List and thumbnail preview.

Namespace:DevExpress.Utils.Taskbar
Assembly:DevExpress.Utils.v17.1.dll

Expanded Syntax

Expanded Remarks

Windows 7 has introduced a new look and new features for application buttons displayed within the system taskbar. The TaskbarAssistant component is designed to facilitate the customization of an application's taskbar button, its Jump List and thumbnail preview.

The Jump List is opened on right-clicking an application taskbar button:

The Jump List can contain:

  • General application commands (painted against the gray background in the image above)
  • The Tasks category with custom commands.
  • Either the Frequent or Recent category (containing recently used files). The contents of these categories are managed by the Windows shell.
  • Custom categories with custom commands (see the Scheduler category in the image above).

When you hover over an application taskbar button, a live thumbnail preview is displayed. The preview window can contain a toolbar with up to seven buttons below the preview image, as in the figure below:

More information on these taskbar features can be found in MSDN at: Taskbar Extensions

The TaskbarAssistant component supports the following taskbar customization features:

Feature Property/Properties
Add custom items to the Tasks category in the Jump List. JumpListTasksCategory
Add custom categories to the Jump List. JumpListCustomCategories
Enable either the Recent or Frequent category in the Jump List. JumpListKnownCategoryVisibility, JumpListKnownCategoryPosition
Add buttons to the toolbar in the thumbnail preview. ThumbnailButtons, ThumbnailButton.Click
Display a progress indicator in the taskbar button. The following progress styles are supported:

Indeterminate marquee-style:

Determinate Normal Style (Reflects the completed percentage of an operation):

Determinate Paused Style (The progress indicator turns yellow to show that progress is currently stopped in one of the windows but can be resumed by the user):

Determinate Error Style (The progress indicator turns red to show that an error has occurred):

ProgressMode, ProgressCurrentValue, ProgressMaximumValue
Display a small overlay icon over the application icon.

OverlayIcon
Use a specific area of the application window as a thumbnail. ThumbnailClipRegion

Expanded Inheritance Hierarchy

System.Object
    System.MarshalByRefObject
       System.ComponentModel.Component
          TaskbarAssistant

Expanded See Also

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