feat: Implements WebViewExtWindows::hwnd and InnerWebView::hwnd handler (#1712)

Author: cod3rkane

.changes/forward-hwnd-handler.md

@@ -0,0 +1,5 @@
+---
+"wry": minor
+---
+
+On Windows, Add `WebViewExtWindows::hwnd` getter to access the child HWND containing the webview.

src/lib.rs

@@ -2255,6 +2255,9 @@ pub trait WebViewExtWindows {
 
   /// Attaches this webview to the given HWND and removes it from the current one.
   fn reparent(&self, hwnd: isize) -> Result<()>;
+
+  /// Returns the child HWND hosting this webview.
+  fn hwnd(&self) -> windows::Win32::Foundation::HWND;
 }
 
 #[cfg(target_os = "windows")]
@@ -2282,6 +2285,11 @@ impl WebViewExtWindows for WebView {
   fn reparent(&self, hwnd: isize) -> Result<()> {
     self.webview.reparent(hwnd)
   }
+
+  /// Returns the child HWND hosting this webview.
+  fn hwnd(&self) -> windows::Win32::Foundation::HWND {
+    self.webview.hwnd()
+  }
 }
 
 /// Additional methods on `WebView` that are specific to Linux.

src/webview2/mod.rs

@@ -1372,6 +1372,11 @@ impl InnerWebView {
     &self.id
   }
 
+  #[inline]
+  pub fn hwnd(&self) -> HWND {
+    self.hwnd
+  }
+
   pub fn eval(
     &self,
     js: &str,