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IVisualTreeServiceCallback2::OnElementStateChanged method

Communicates the state of an element in the visual tree when it changes.

Syntax

virtual HRESULT OnElementStateChanged(
   InstanceHandle     element,
   VisualElementState elementState,
   LPCWSTR            context
) = 0;

Parameters

element

The XAML element in the visual tree.

elementState

The state of the element.

context

The path to the element.

Return value

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

When any XAML diagnostics API results in a resource reference becoming invalid, this callback will be notified of the invalid reference. An instance handle will be given that corresponds to an element in the tree, and a string representation of the path to the invalid reference. The grammar for the syntax is: PropertyName:Full.Dotted.TypeName[Indexer] and paths can be separated with a forward slash ("/") to be chained together.

See also

IVisualTreeServiceCallback2