Third party libraries

Avalonia XPF implements WPF's API surface, however a variety of third party libraries also depend on various win32 APIs which are obviously not available cross-platform.

To deal with this problem, Avalonia XPF implements a win32 API emulation layer that allows 3rd party libraries to work on non-windows platforms. This emulation layer needs to be enabled explictly in your XPF application.

This feature must be enabled before any assembly attempts to call a win32 API, so the constructor of your App class or Program.Main is a good place to enable it.

To enable win32 API emulation application-wide you can add the following call:

  AvaloniaUI.Xpf.WinApiShim.WinApiShimSetup.AutoEnable();

You can exclude libraries that are known to provide non-windows platform support like this:

AvaloniaUI.Xpf.WinApiShim.WinApiShimSetup.
  .AutoEnable(asm =>
  {
    var name = asm.GetName().Name.ToLowerInvariant();
    if (name is "sqlite" or "jint" or "esprima" or "magick.net" or "magick.net.core")
      return true;
    return false;
  });

Alternatively the layer can be enabled on per-library basis:

AvaloniaUI.Xpf.WinApiShim.WinApiShimSetup
  .AddLibrary(typeof(Type.In.Third.Party.Library).Assembly);

Compatibility Database

We maintain a comprehensive compatibility database for third-party controls. This database provides up-to-date status information for controls from major vendors.

к сведению

If you find that a control marked as Fix In Progress or Untested is mission-critical for your application, please contact our support team. We're committed to working with you to ensure compatibility.

Compatibility Notes

• Pure WPF Controls: Third-party controls that are implemented purely in WPF typically work without any issues, even if not listed in our compatibility database.
• Unlisted Vendors: The absence of a control vendor from our database doesn't indicate incompatibility. We encourage you to test any controls you need.
• Known Challenges: Issues most commonly arise with controls that utilize GDI or WinForms components.

WinAPI Shim APIs

Below is an overview of the Windows API (WinAPI) shims available in Avalonia XPF. These shims allow for native Windows functionality while maintaining cross-platform compatibility. Some APIs may not be fully implemented.

Window Management

Window Creation and Manipulation

// Window Creation
IntPtr CreateWindowEx(uint dwExStyle, void* lpClassName, void* lpWindowName, uint dwStyle, 
    int x, int y, int nWidth, int nHeight, IntPtr hWndParent, IntPtr hMenu, 
    IntPtr hInstance, IntPtr lpParam);
IntPtr CreateWindowExW(uint dwExStyle, void* lpClassName, void* lpWindowName, uint dwStyle, 
    int x, int y, int nWidth, int nHeight, IntPtr hWndParent, IntPtr hMenu, 
    IntPtr hInstance, IntPtr lpParam);
short RegisterClass(void* wc);
short RegisterClassExW(WNDCLASSEX* lpwcx);

// Window State and Properties
int GetWindowPlacement(IntPtr hWnd, IntPtr lpwndpl);
int GetWindowRect(IntPtr hWnd, RECT* lpRect);
int GetClientRect(IntPtr hWnd, RECT* lpRect);
int IsWindowEnabled(IntPtr hWnd);
int IsWindowVisible(IntPtr hWnd);
int IsWindow(IntPtr hWnd);
int GetWindowInfo(IntPtr hwnd, WINDOWINFO* pwi);

// Window Position and Layout
IntPtr BeginDeferWindowPos(int nNumWindows);
int EndDeferWindowPos(IntPtr hWinPosInfo);
int SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, int uFlags);
uint AdjustWindowRectEx(RECT* lpRect, uint dwStyle, uint bMenu, uint dwExStyle);

// Window Properties
int GetWindowLong(IntPtr hWnd, int nIndex);
int SetWindowLong(IntPtr hWnd, int nIndex, int newVal);
IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex);
IntPtr GetWindowLongPtrW(IntPtr hWnd, int nIndex);
IntPtr SetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr newVal);

// Window Hierarchy and Relations
IntPtr GetActiveWindow();
IntPtr GetTopWindow(IntPtr hWnd);
IntPtr GetWindow(IntPtr hWnd, uint uCmd);
IntPtr GetDesktopWindow();
IntPtr WindowFromPoint(long p);
IntPtr FindWindow(void* lpClassName, void* lpWindowName);
int EnumChildWindows(IntPtr window, IntPtr callback, IntPtr lParam);

// Window Display and Region
int SetWindowDisplayAffinity(IntPtr hWnd, int* dwAffinity);
int SetWindowRgn(IntPtr hWnd, IntPtr hRgn, int bRedraw);
int RedrawWindow(IntPtr hWnd, RECT* lprcUpdate, IntPtr hrgnUpdate, uint flags);
int InvalidateRect(IntPtr hWnd, RECT* lpRect, int bErase);

// System Menu
IntPtr GetSystemMenu(IntPtr hWnd, int bRevert);

Focus and Input Management

IntPtr GetFocus();
IntPtr GetCapture();
int ReleaseCapture();
int SetForegroundWindow(IntPtr hWnd);
short GetKeyState(int vKey);
int GetMessagePos();
int GetMessageTime();
int GetCursorPos(POINT* lpPoint);

Graphics and Device Context

Device Context Management

IntPtr GetDC(IntPtr hWnd);
IntPtr CreateCompatibleDC(IntPtr hdc);
int DeleteDC(IntPtr hdc);
int GetDeviceCaps(IntPtr hdc, int nIndex);
int ReleaseDC(IntPtr hWnd, IntPtr hDC);

Region and Drawing Objects

IntPtr CreateRectRgn(int x1, int y1, int x2, int y2);
IntPtr CreateRoundRectRgn(int x1, int y1, int x2, int y2, int cx, int cy);
IntPtr CreateRectRgnIndirect(RECT* lprc);
int DeleteObject(IntPtr obj);
IntPtr GetStockObject(int i);

Coordinate System and Mapping

int GetMapMode(IntPtr hdc);
int SetMapMode(IntPtr hdc, int fnMapMode);
int SetWindowExtEx(IntPtr hdc, int x, int y, SIZE* lpsz);
int SetViewportExtEx(IntPtr hdc, int x, int y, SIZE* lpsz);
int OffsetRect(IntPtr lprc, int x, int y);

Desktop Window Manager (DWM)

int DwmIsCompositionEnabled(int* enabled);
int DwmExtendFrameIntoClientArea(IntPtr hWnd, MARGINS* pMarInset);
uint DwmGetWindowAttribute(IntPtr hwnd, int attribute, uint* pvAttribute, uint cbAttribute);
uint DwmSetWindowAttribute(IntPtr hwnd, int attribute, uint* pvAttribute, uint cbAttribute);

Monitor and Display

IntPtr MonitorFromPoint(long point, uint dwFlags);
IntPtr MonitorFromRect(IntPtr lprc, uint dwFlags);
IntPtr MonitorFromWindow(IntPtr handle, uint flags);
int GetMonitorInfo(IntPtr hMonitor, IntPtr lpmi);
int EnumDisplayMonitors(IntPtr hdc, IntPtr lprcClip, IntPtr lpfnEnum, IntPtr data);
int GetDpiForMonitor(IntPtr hMonitor, int dpiType, uint* dpiX, uint* dpiY);
int GetDpiForWindow(IntPtr hWnd);
int GetProcessDpiAwareness(IntPtr hWnd, int* value);

Input Method Editor (IME)

IntPtr ImmCreateContext();
int ImmDestroyContext(IntPtr hIMC);
IntPtr ImmGetContext(IntPtr hWnd);
int ImmReleaseContext(IntPtr hWnd, IntPtr hIMC);
IntPtr ImmAssociateContext(IntPtr hWnd, IntPtr hIMC);
int ImmSetOpenStatus(IntPtr hIMC, int open);
int ImmGetOpenStatus(IntPtr hIMC);
int ImmNotifyIME(IntPtr hIMC, int dwAction, int dwIndex, int dwValue);
int ImmGetProperty(IntPtr hkl, int flags);
int ImmGetCompositionString(IntPtr hIMC, int dwIndex, void* lpBuf, int dwBufLen);
int ImmGetCompositionStringW(IntPtr hIMC, int dwIndex, void* lpBuf, int dwBufLen);
int ImmSetCompositionFont(IntPtr hIMC, void* lf);
int ImmSetCompositionFontW(IntPtr hIMC, void* lf);
int ImmConfigureIMEW(IntPtr hkl, IntPtr hwnd, int dwData, void* registerWord);
int ImmSetCompositionWindow(IntPtr hIMC, void* compform);
int ImmSetCandidateWindow(IntPtr hIMC, void* candform);
IntPtr ImmGetDefaultIMEWnd(IntPtr hwnd);

System Information and Settings

int GetSysColor(int nIndex);
int SystemParametersInfo(uint uiAction, uint uiParam, void* pvParam, uint fWinIni);
int SystemParametersInfoW(uint uiAction, uint uiParam, void* pvParam, uint fWinIni);
uint GetDoubleClickTime();
int GetSystemMetrics(int index);
int RtlGetVersion(RTL_OSVERSIONINFOW* lpVersionInformation);
uint GetCaretBlinkTime();

Messages and Window Procedures

IntPtr SendMessage(IntPtr hWnd, int uMsg, IntPtr wParam, IntPtr lParam);
int PostMessage(IntPtr hWnd, int uMsg, IntPtr wParam, IntPtr lParam);
IntPtr DefWindowProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);
IntPtr DefWindowProcW(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);
uint FormatMessageW(int dwFlags, IntPtr lpSource, int dwMessageId, int dwLanguageId, 
    IntPtr* lpBuffer, int nSize, IntPtr Arguments);

Hooks and Thread Management

IntPtr SetWindowsHookEx(int idHook, IntPtr lpfn, IntPtr hMod, uint dwThreadId);
int UnhookWindowsHookEx(IntPtr hWnd);
int GetCurrentThreadId();
int EnumThreadWindows(int dwThreadId, IntPtr lpfn, IntPtr lParam);

File and Resource Management

IntPtr LoadLibrary(void* lpLib);
IntPtr LoadLibraryW(void* lpLib);
int LoadString(IntPtr hInstance, uint uID, void* lpBuffer, int cchBufferMax);
int LoadStringW(IntPtr hInstance, uint uID, void* lpBuffer, int cchBufferMax);
IntPtr CreateFileMapping(IntPtr hFile, IntPtr lpFileMappingAttributes, uint flProtect, 
    uint dwMaximumSizeHigh, uint dwMaximumSizeLow, char* lpName);
IntPtr MapViewOfFile(IntPtr hFileMappingObject, uint dwDesiredAccess, uint dwFileOffsetHigh, 
    uint dwFileOffsetLow, IntPtr dwNumberOfBytesToMap);
int UnmapViewOfFile(IntPtr lpBaseAddress);
int CloseHandle(IntPtr hObject);
IntPtr FindFirstFile(char* lpFilename, IntPtr findData);
int FindNextFile(IntPtr findHandle, IntPtr findData);
int FindClose(IntPtr findHandle);
int GetModuleFileName(IntPtr module, char* lpFilename, int nSize);
IntPtr GetModuleHandle(char* lpModuleName);
IntPtr GetModuleHandleW(char* lpModuleName);

UI Elements and Theming

// Caret
int CreateCaret(IntPtr hWnd, IntPtr hBitmap, int width, int height);
int ShowCaret(IntPtr hWnd);
int HideCaret(IntPtr hWnd);
int DestroyCaret();
int SetCaretPos(int x, int y);

// Menus
uint TrackPopupMenuEx(IntPtr hmenu, uint fuFlags, int x, int y, IntPtr hwnd, IntPtr lptpm);
int EnableMenuItem(IntPtr hMenu, int uIDEnableItem, int uEnable);

// Theming
int IsThemeActive();
int SetWindowThemeAttribute(IntPtr hWnd, uint wtype, WTA_OPTIONS* attributes, uint size);

Shell and Icons

int AddClipboardFormatListener(IntPtr hwnd);
IntPtr SHGetFileInfo(void* pszPath, uint dwFileAttributes, SHFILEINFOA* psfi, 
    uint cbFileInfo, uint uFlags);
IntPtr SHGetFileInfoW(void* pszPath, uint dwFileAttributes, SHFILEINFOW* psfi, 
    uint cbFileInfo, uint uFlags);
int ExtractIconEx(void* lpszFile, int nIconIndex, void* phiconLarge, void* phiconSmall, int nIcons);
int ExtractIconExW(void* lpszFile, int nIconIndex, void* phiconLarge, void* phiconSmall, int nIcons);

Memory Operations

void RtlMoveMemory(IntPtr destination, IntPtr source, uint length);

Text Services

int TF_CreateThreadMgr(void* threadMgr);

Notes

• Functions with 'W' suffix are Unicode versions
• Most functions return non-zero for success, zero for failure
• IntPtr parameters typically represent handles (HWND, HDC, etc.)
• void* parameters are typically for strings or structures in unmanaged code

Usage Example

// Example of getting window dimensions and position
var hwnd = window.PlatformImpl.Handle.Handle;
var rect = new RECT();
if (GetWindowRect(hwnd, &rect) != 0)
{
    int width = rect.right - rect.left;
    int height = rect.bottom - rect.top;
    int x = rect.left;
    int y = rect.top;
}