adding-editor-adornments

To add editor adornments to a Visual Studio extension, implement an IWpfTextViewCreationListener and use an AdornmentLayer to render WPF UI elements directly on the text editor surface. Use MEF exports to attach the adornments.

Viewport-relative adornments in Visual Studio overlay fixed positions on the editor screen, while text-relative adornments anchor to specific code regions and move with the text. Both are rendered using the AdornmentLayer without modifying source text.

To handle view changes when rendering VSSDK editor adornments, handle LayoutChanged events to redraw the WPF visuals whenever the text view updates. This ensures performance-conscious synchronization of overlays with the editor state.

Yes, you need MEF asset type declarations in the .vsixmanifest for editor adornments to ensure reliable loading and lifecycle management. Combining MEF-based components with proper asset declarations enables the VSSDK to correctly register and activate the adornment.

You can highlight specific code regions in Visual Studio without modifying the source text by creating text-relative editor adornments. This technique uses the AdornmentLayerDefinition to render visual highlights and inline decorations over the existing code.

Visual Studio in-process editor adornments may fail to load if the MEF asset type is not properly declared in the .vsixmanifest. Ensure your IWpfTextViewCreationListener uses correct MEF exports for reliable lifecycle management.