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WinExplorerView.GetThumbnailImage Event

Allows you to asynchronously assign an image to a WinExplorerView record.

Namespace: DevExpress.XtraGrid.Views.WinExplorer

Assembly: DevExpress.XtraGrid.v19.2.dll

Declaration

[DXCategory("Data")]
public event ThumbnailImageEventHandler GetThumbnailImage

Event Data

The GetThumbnailImage event's data class is ThumbnailImageEventArgs. The following properties provide information specific to this event:

Property Description
DataSourceIndex Gets the index of the currently processed item among other items in the source (the item's index in the bound data source for data-aware controls, e.g., GridControl).
DesiredThumbnailSize Stores the desired size of thumbnail images, generated using the ThumbnailImageEventArgs.CreateThumbnailImage method.
ThumbnailImage Gets or sets the image that will be assigned to an item that fired this event.

The event data class exposes the following methods:

Method Description
CreateThumbnailImage(Image) Creates a thumbnail image that will be assigned to an item that supports the asynchronous image load feature.
CreateThumbnailImage(Image, Size) Creates a thumbnail image of the specific size. This image will be later assigned to an item that supports the asynchronous image load feature.
ResetImageCache() Resets the image cache and causes all items that are not currently visible to reload their images when displayed again.

Remarks

The GetThumbnailImage event is raised each time a WinExplorerView record needs to display its image and both of the following conditions are met:

The event allows you to create a required image by using the ThumbnailImageEventArgs.CreateThumbnailImage method and assign the generated image to the ThumbnailImageEventArgs.ThumbnailImage property. See the Asynchronous Image Load in WinExplorer and Tile Views topic to learn more.

IMPORTANT

The GetThumbnailImage event is raised from a non-UI thread.

See Also