WinUI COM Interop
To develop with COM interop APIs for WinUI, you need these headers:
- microsoft.ui.xaml.hosting.desktopwindowxamlsource.h
- microsoft.ui.xaml.hosting.referencetracker.h
- microsoft.ui.xaml.media.dxinterop.h
- microsoft.ui.xaml.window.h
- xamlom.winui.h
For programming guidance for this technology, see WinUI 3.
Enumerations
| XAML_REFERENCETRACKER_DISCONNECT |
Functions
| AddMemoryPressure Informs the host of increased memory allocations since the last notification. |
| AddRefFromReferenceTracker Indicates that the reference tracker is returning the target XAML object(s) from previous calls to FindTrackerTargets. |
| AddRefFromTrackerSource Indicates each time that a tracker source calls IUnknown::AddRef on the reference tracker (called after AddRef). |
| BeginDraw |
| BeginDraw |
| ConnectFromTrackerSource Indicates that a reference tracker source has created its first COM reference on a reference tracker object. |
| CreateTrackerHandle |
| DeleteTrackerHandle |
| DisconnectFromTrackerSource Indicates that a reference tracker source has stopped tracking a reference tracker. |
| DisconnectUnusedReferenceSources Requests that the host perform garbage collection and remove all unnecessary reference sources. |
| EndDraw |
| EndDraw |
| FindTrackerTargets Finds the reference tracker targets that are reachable from a reference tracker source. |
| FindTrackerTargetsCompleted Indicates that a garbage collection system has finished making all the calls it needs to IReferenceTracker::FindTrackerTargets (by this time, XAML has pegged all reference tracker targets that it wants to protect). |
| FlushAllSurfacesWithDevice |
| FoundTrackerTarget Called whenever a XAML object reference tracker target is found. |
| get_WindowHandle Retrieves the window handle (HWND) of the window represented by the object that implements IWindowNative. |
| GetReferenceTrackerManager Gets an IReferenceTrackerManager interface from a XAML object. |
| GetTrackerTarget Requests the host provide a reference tracker target that references a reference tracker source. This tracker target then controls the lifetime of the tracker source. |
| GetUiLayerForXamlRoot Gets the visual diagnostics root that can be used to draw on for highlighting elements in the tree. |
| GetUpdateRectCount |
| GetUpdateRects |
| GetVisibleBounds |
| HitTestForXamlRoot Gets all elements in the visual tree that fall within the specified rectangle. |
| Invalidate |
| NotifyEndOfReferenceTrackingOnThread Notifies the host that reference tracking is no longer available on the calling thread; XAML calls this when the FrameworkView is uninitialized. |
| OnXamlRootChange Communicates when a XamlRoot root is added or removed. |
| Peg Marks that the reference tracker target is in use by the XAML framework, and should not be collected. |
| PegFromTrackerSource Indicates that a tracker source is unable to protected a reference tracker object. |
| ReferenceTrackingCompleted Indicates that a garbage collection system has finished with its collection process (at this point, XAML unblocks threads attempting to update tracked references). |
| ReferenceTrackingStarted Indicates that a garbage collector is performing a collection. |
| RegisterForUpdatesNeeded |
| ReleaseDisconnectedReferenceSources Requests that the host call IUnknown::Release on any reference tracker objects that have been disconnected by a reference source. |
| ReleaseFromReferenceTracker Releases the XAML object reference marked in a previous call to AddRefFromReferenceTracker. |
| ReleaseFromTrackerSource Indicates each time that a tracker source calls IUnknown::Release on the reference tracker (must be called before the Release call). |
| RemoveMemoryPressure Informs the host of reduced memory allocations since the last notification. |
| Resize |
| ResumeDraw |
| SetDevice |
| SetDevice |
| SetReferenceTrackerHost Registers an IReferenceTrackerHost interface with XAML. |
| SetSwapChain |
| SetSwapChain |
| SetSwapChainHandle |
| SetTrackerValue |
| SuspendDraw |
| TryGetSafeTrackerValue |
| Unpeg Marks that the reference tracker target is no longer in use by the XAML framework and can be collected. |
| UpdatesNeeded |
Interfaces
| IFindReferenceTargetsCallback Defines the interface for callbacks from FindTrackerTargets. |
| IReferenceTracker Defines the interface implemented by the XAML framework for managing XAML object references. |
| IReferenceTrackerExtension |
| IReferenceTrackerHost Defines an interface that provides the global services used by the garbage collection (GC) system used by the XAML framework. |
| IReferenceTrackerManager Defines the interface for a XAML object reference manager. Implement this interface to manage instances of IReferenceTracker on XAML objects. |
| IReferenceTrackerTarget Defines an interface implemented by a garbage collector object referenced from XAML. |
| ISurfaceImageSourceManagerNative |
| ISurfaceImageSourceNative |
| ISurfaceImageSourceNativeWithD2D |
| ISwapChainBackgroundPanelNative |
| ISwapChainPanelNative |
| ISwapChainPanelNative2 |
| ITrackerOwner |
| IVirtualSurfaceImageSourceNative |
| IVirtualSurfaceUpdatesCallbackNative |
| IVisualTreeServiceCallback3 Represents additional capabilities of an IVisualTreeServiceCallback2 object. |
| IWindowNative Enables interoperability between XAML and a native window. |
| IXamlDiagnostics2 Represents additional capabilities of an IXamlDiagnostics object. |
Structures
| TrackerHandle__ |