Handle wkwebview web content process termination

src/lib.rs

@@ -792,6 +792,13 @@ pub struct WebViewAttributes<'a> {
 
   /// Whether JavaScript should be disabled.
   pub javascript_disabled: bool,
+
+  /// Set a handler closure to respond to web content process termination.
+  ///
+  /// ## Platform-specific:
+  ///
+  /// - **Linux / Windows / Android**: Unsupported.
+  pub on_web_content_process_terminate_handler: Option<Box<dyn Fn()>>,
 }
 
 impl Default for WebViewAttributes<'_> {
@@ -834,6 +841,7 @@ impl Default for WebViewAttributes<'_> {
       }),
       background_throttling: None,
       javascript_disabled: false,
+      on_web_content_process_terminate_handler: None,
     }
   }
 }
@@ -1405,6 +1413,15 @@ impl<'a> WebViewBuilder<'a> {
     self
   }
 
+  /// Set a handler to respond to web content process termination.
+  pub fn with_on_web_content_process_terminate_handler(
+    mut self,
+    handler: impl Fn() + 'static,
+  ) -> Self {
+    self.attrs.on_web_content_process_terminate_handler = Some(Box::new(handler));
+    self
+  }
+
   /// Consume the builder and create the [`WebView`] from a type that implements [`HasWindowHandle`].
   ///
   /// # Platform-specific:

src/wkwebview/class/wry_navigation_delegate.rs

@@ -22,6 +22,7 @@ use crate::{
     download::{navigation_download_action, navigation_download_response},
     navigation::{
       did_commit_navigation, did_finish_navigation, navigation_policy, navigation_policy_response,
+      web_content_process_did_terminate,
     },
   },
   PageLoadEvent, WryWebView,
@@ -35,6 +36,7 @@ pub struct WryNavigationDelegateIvars {
   pub navigation_policy_function: Box<dyn Fn(String) -> bool>,
   pub download_delegate: Option<Retained<WryDownloadDelegate>>,
   pub on_page_load_handler: Option<Box<dyn Fn(PageLoadEvent)>>,
+  pub on_web_content_process_terminate_handler: Option<Box<dyn Fn()>>,
 }
 
 define_class!(
@@ -96,6 +98,11 @@ define_class!(
     ) {
       navigation_download_response(self, webview, response, download);
     }
+
+    #[unsafe(method(webViewWebContentProcessDidTerminate:))]
+    fn web_content_process_did_terminate(&self, webview: &WKWebView) {
+      web_content_process_did_terminate(self, webview);
+    }
   }
 );
 
@@ -108,6 +115,7 @@ impl WryNavigationDelegate {
     navigation_handler: Option<Box<dyn Fn(String) -> bool>>,
     download_delegate: Option<Retained<WryDownloadDelegate>>,
     on_page_load_handler: Option<Box<dyn Fn(PageLoadEvent, String)>>,
+    on_web_content_process_terminate_handler: Option<Box<dyn Fn()>>,
     mtm: MainThreadMarker,
   ) -> Retained<Self> {
     let navigation_policy_function = Box::new(move |url: String| -> bool {
@@ -125,6 +133,15 @@ impl WryNavigationDelegate {
       None
     };
 
+    let on_web_content_process_terminate_handler = if let Some(handler) = on_web_content_process_terminate_handler {
+      let custom_handler = Box::new(move || {
+        handler();
+      }) as Box<dyn Fn()>;
+      Some(custom_handler)
+    } else {
+      None
+    };
+
     let delegate = mtm
       .alloc::<WryNavigationDelegate>()
       .set_ivars(WryNavigationDelegateIvars {
@@ -133,6 +150,7 @@ impl WryNavigationDelegate {
         has_download_handler,
         download_delegate,
         on_page_load_handler,
+        on_web_content_process_terminate_handler,
       });
 
     unsafe { msg_send![super(delegate), init] }

src/wkwebview/mod.rs

@@ -542,6 +542,7 @@ impl InnerWebView {
         attributes.navigation_handler,
         download_delegate.clone(),
         attributes.on_page_load_handler,
+        attributes.on_web_content_process_terminate_handler,
         mtm,
       );
 

src/wkwebview/navigation.rs

@@ -102,3 +102,12 @@ pub(crate) fn navigation_policy_response(
     (*handler).call((WKNavigationResponsePolicy::Allow,));
   }
 }
+
+pub(crate) fn web_content_process_did_terminate(
+  this: &WryNavigationDelegate,
+  _webview: &WKWebView,
+) {
+  if let Some(on_web_content_process_terminate) = &this.ivars().on_web_content_process_terminate_handler {
+    on_web_content_process_terminate();
+  }
+}