From c93457a4911ee4225702a9b50b703fdc71d2cba4 Mon Sep 17 00:00:00 2001
From: Robert Lillack <rob@lillack.net>
Date: Tue, 14 May 2024 09:14:39 +0200
Subject: [PATCH] application: Add RunOnMainLoop

---
 application.go | 14 ++++++++++++++
 application.h  |  4 +++-
 application.m  |  7 +++++++
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/application.go b/application.go
index 6e503d2..2aa03a9 100644
--- a/application.go
+++ b/application.go
@@ -4,6 +4,7 @@ package gocoa
 // #cgo LDFLAGS: -framework Cocoa
 // #include "application.h"
 import "C"
+import "runtime/cgo"
 
 var appDidFinishLaunchingFunc func()
 
@@ -34,3 +35,16 @@ func callOnApplicationDidFinishLaunchingHandler() {
 		appDidFinishLaunchingFunc()
 	}
 }
+
+//export go_callback
+func go_callback(h C.uintptr_t) {
+	hnd := cgo.Handle(h)
+	fn := hnd.Value().(func())
+	fn()
+	hnd.Delete()
+}
+
+func RunOnMainLoop(fn func()) {
+	h := cgo.NewHandle(fn)
+	C.RunOnMainLoop(C.uintptr_t(h))
+}
diff --git a/application.h b/application.h
index 01dbfd1..876e7fb 100644
--- a/application.h
+++ b/application.h
@@ -1,5 +1,7 @@
+#include <stdint.h>
 #import <Cocoa/Cocoa.h>
 
 void InitSharedApplication();
 void RunApplication();
-void TerminateApplication();
\ No newline at end of file
+void TerminateApplication();
+void RunOnMainLoop(uintptr_t h);
\ No newline at end of file
diff --git a/application.m b/application.m
index 7e05f56..572b03b 100644
--- a/application.m
+++ b/application.m
@@ -31,4 +31,11 @@ void RunApplication() {
 
 void TerminateApplication() {
     [NSApp terminate:nil];
+}
+
+extern void go_callback(uintptr_t h);
+void RunOnMainLoop(uintptr_t h) {
+    dispatch_async(dispatch_get_main_queue(), ^{
+        go_callback(h);
+    });
 }
\ No newline at end of file