fix: restore macOS navigation with unsaved forms

2026-10-15 08:56:29 +02:00
parent ba12e65e81
commit 1082b6ac82
9 changed files with 152 additions and 12 deletions
@@ -1,6 +1,55 @@
+#import <AppKit/AppKit.h>
 #import <WebKit/WebKit.h>
+#import <objc/runtime.h>
+
+@interface KanbanWorkspaceUIDelegate : NSObject <WKUIDelegate>
+@property(nonatomic, strong) id<WKUIDelegate> originalDelegate;
+@end
+
+@implementation KanbanWorkspaceUIDelegate
+- (BOOL)respondsToSelector:(SEL)selector {
+    return [super respondsToSelector:selector] || [self.originalDelegate respondsToSelector:selector];
+}
+
+- (id)forwardingTargetForSelector:(SEL)selector {
+    if ([self.originalDelegate respondsToSelector:selector]) {
+        return self.originalDelegate;
+    }
+    return [super forwardingTargetForSelector:selector];
+}
+
+- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message
+        initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler {
+    NSWindow *window = webView.window;
+    if (!window || window.attachedSheet) {
+        completionHandler(NO);
+        return;
+    }
+
+    NSAlert *alert = [NSAlert new];
+    alert.alertStyle = NSAlertStyleWarning;
+    alert.messageText = frame.request.URL.host ?: @"KanbanGit";
+    alert.informativeText = message;
+    [alert addButtonWithTitle:@"OK"];
+    [alert addButtonWithTitle:@"Cancel"];
+    [alert beginSheetModalForWindow:window completionHandler:^(NSModalResponse response) {
+        completionHandler(response == NSAlertFirstButtonReturn);
+    }];
+}
+@end
+
+static char workspaceUIDelegateKey;

 void install_workspace_navigation(void *pointer) {
    WKWebView *webview = (__bridge WKWebView *)pointer;
    webview.allowsBackForwardNavigationGestures = YES;
+    if ([webview.UIDelegate isKindOfClass:KanbanWorkspaceUIDelegate.class]) {
+        return;
+    }
+
+    KanbanWorkspaceUIDelegate *delegate = [KanbanWorkspaceUIDelegate new];
+    delegate.originalDelegate = webview.UIDelegate;
+    // WKWebView keeps a weak UI delegate, so retain the forwarding adapter with its view.
+    objc_setAssociatedObject(webview, &workspaceUIDelegateKey, delegate, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    webview.UIDelegate = delegate;
 }