Integrate with Text Services Framework on Windows

Cargo.toml

@@ -88,6 +88,16 @@ scopeguard = "1.1.0"
 wio = "0.2.2"
 accesskit_windows = { version = "0.10.0", optional = true }
 
+[target.'cfg(target_os="windows")'.dependencies.windows]
+version = "0.36.1"
+features = [
+    "implement",
+    "Win32_Foundation",
+    "Win32_UI_TextServices",
+    "Win32_System_Ole",
+    "Win32_System_Com"
+]
+
 [target.'cfg(target_os="windows")'.dependencies.winapi]
 version = "0.3.9"
 features = ["d2d1_1", "dwrite", "winbase", "libloaderapi", "errhandlingapi", "winuser",

src/backend/windows/error.rs

@@ -38,6 +38,13 @@ pub enum Error {
     OldWindows,
     /// The `hwnd` pointer was null.
     NullHwnd,
+    WindowsResult(windows::core::Error),
+}
+
+impl From<windows::core::Error> for Error {
+    fn from(v: windows::core::Error) -> Self {
+        Self::WindowsResult(v)
+    }
 }
 
 fn hresult_description(hr: HRESULT) -> Option<String> {
@@ -78,6 +85,7 @@ impl fmt::Display for Error {
             Error::Direct2D => write!(f, "Direct2D error"),
             Error::OldWindows => write!(f, "Attempted newer API on older Windows"),
             Error::NullHwnd => write!(f, "Window handle is Null"),
+            Error::WindowsResult(e) => e.fmt(f),
         }
     }
 }

src/backend/windows/mod.rs

@@ -27,6 +27,7 @@ pub mod screen;
 mod timers;
 pub mod util;
 pub mod window;
+mod text_input;
 
 // https://docs.microsoft.com/en-us/windows/win32/direct2d/render-targets-overview
 // ID2D1RenderTarget is the interface. The other resources inherit from it.