app: [macOS] implement custom event dispatching

To get rid of app.Main, we need to control the main thread. The macOS
[NSApp run] must be called on the main goroutine and never yields control.

Implement the escape hatch which is calling [NSApp stop] to force
[NSApp run] to return and allow us to fetch and dispatch events one at a
time.

This change is separate from the larger change removing app.Main to ease
bisecting.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/os_darwin.go

@@ -15,8 +15,8 @@ __attribute__ ((visibility ("hidden"))) void gio_hideCursor();
 __attribute__ ((visibility ("hidden"))) void gio_showCursor();
 __attribute__ ((visibility ("hidden"))) void gio_setCursor(NSUInteger curID);
 
-static bool isMainThread() {
-	return [NSThread isMainThread];
+static int isMainThread() {
+	return [NSThread isMainThread] ? 1 : 0;
 }
 
 static NSUInteger nsstringLength(CFTypeRef cstr) {
@@ -77,7 +77,7 @@ var mainFuncs = make(chan func(), 1)
 
 // runOnMain runs the function on the main thread.
 func runOnMain(f func()) {
-	if C.isMainThread() {
+	if isMainThread() {
 		f()
 		return
 	}
@@ -87,6 +87,10 @@ func runOnMain(f func()) {
 	}()
 }
 
+func isMainThread() bool {
+	return C.isMainThread() != 0
+}
+
 //export gio_dispatchMainFuncs
 func gio_dispatchMainFuncs() {
 	for {
@@ -259,10 +263,3 @@ func windowSetCursor(from, to pointer.Cursor) pointer.Cursor {
 	C.gio_setCursor(C.NSUInteger(macosCursorID[to]))
 	return to
 }
-
-func (w *window) wakeup() {
-	runOnMain(func() {
-		w.loop.Wakeup()
-		w.loop.FlushEvents()
-	})
-}

app/os_darwin.m

@@ -1,11 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-#import <Foundation/Foundation.h>
-
-#include "_cgo_export.h"
-
-void gio_wakeupMainThread(void) {
-	dispatch_async(dispatch_get_main_queue(), ^{
-		gio_dispatchMainFuncs();
-	});
-}

app/os_ios.go

@@ -396,5 +396,12 @@ func gio_runMain() {
 	runMain()
 }
 
+func (w *window) wakeup() {
+	runOnMain(func() {
+		w.loop.Wakeup()
+		w.loop.FlushEvents()
+	})
+}
+
 func (UIKitViewEvent) implementsViewEvent() {}
 func (UIKitViewEvent) ImplementsEvent()     {}

app/os_ios.m

@@ -276,3 +276,9 @@ void gio_viewSetHandle(CFTypeRef viewRef, uintptr_t handle) {
 	GioView *v = (__bridge GioView *)viewRef;
 	v.handle = handle;
 }
+
+void gio_wakeupMainThread(void) {
+	dispatch_async(dispatch_get_main_queue(), ^{
+		gio_dispatchMainFuncs();
+	});
+}

app/os_macos.go

@@ -39,7 +39,7 @@ import (
 #define MOUSE_DOWN 3
 #define MOUSE_SCROLL 4
 
-__attribute__ ((visibility ("hidden"))) void gio_main(void);
+__attribute__ ((visibility ("hidden"))) void gio_initApp(void);
 __attribute__ ((visibility ("hidden"))) CFTypeRef gio_createView(void);
 __attribute__ ((visibility ("hidden"))) CFTypeRef gio_createWindow(CFTypeRef viewRef, CGFloat width, CGFloat height, CGFloat minWidth, CGFloat minHeight, CGFloat maxWidth, CGFloat maxHeight);
 __attribute__ ((visibility ("hidden"))) void gio_viewSetHandle(CFTypeRef viewRef, uintptr_t handle);
@@ -289,6 +289,16 @@ static void invalidateCharacterCoordinates(CFTypeRef viewRef) {
 		}
 	}
 }
+
+static void dispatchEvent(void) {
+	@autoreleasepool {
+		NSEvent *event = [NSApp nextEventMatchingMask:NSEventMaskAny
+		                                        untilDate:[NSDate distantFuture]
+		                                           inMode:NSDefaultRunLoopMode
+		                                          dequeue:YES];
+		[NSApp sendEvent:event];
+	}
+}
 */
 import "C"
 
@@ -323,13 +333,16 @@ type window struct {
 	config Config
 }
 
-// launched is closed when applicationDidFinishLaunching is called.
+// launched is closed after gio_initApp returns.
 var launched = make(chan struct{})
 
 // nextTopLeft is the offset to use for the next window's call to
 // cascadeTopLeftFromPoint.
 var nextTopLeft C.NSPoint
 
+// mainThreadWindow is the window currently in control of the main thread.
+var mainThreadWindow *window
+
 func windowFor(h C.uintptr_t) *window {
 	return cgo.Handle(h).Value().(*window)
 }
@@ -822,23 +835,51 @@ func (w *window) draw() {
 
 func (w *window) ProcessEvent(e event.Event) {
 	w.w.ProcessEvent(e)
-	w.loop.FlushEvents()
+	// The main thread window deliver events in Event.
+	if w != mainThreadWindow {
+		w.loop.FlushEvents()
+	}
 }
 
 func (w *window) Event() event.Event {
-	return w.loop.Event()
+	if !isMainThread() {
+		return w.loop.Event()
+	}
+	mainThreadWindow = w
+	defer func() { mainThreadWindow = nil }()
+	for {
+		if evt, ok := w.loop.win.nextEvent(); ok {
+			return evt
+		}
+		C.dispatchEvent()
+		gio_dispatchMainFuncs()
+	}
 }
 
 func (w *window) Invalidate() {
+	if isMainThread() {
+		mainThreadWindow = w
+		defer func() { mainThreadWindow = nil }()
+	}
 	w.loop.Invalidate()
 }
 
 func (w *window) Run(f func()) {
+	if isMainThread() {
+		mainThreadWindow = w
+		defer func() { mainThreadWindow = nil }()
+	}
 	w.loop.Run(f)
 }
 
 func (w *window) Frame(frame *op.Ops) {
-	w.loop.Frame(frame)
+	if !isMainThread() {
+		w.loop.Frame(frame)
+		return
+	}
+	mainThreadWindow = w
+	defer func() { mainThreadWindow = nil }()
+	w.loop.win.ProcessFrame(frame, nil)
 }
 
 func configFor(scale float32) unit.Metric {
@@ -898,20 +939,27 @@ func gio_onWindowed(h C.uintptr_t) {
 	w.ProcessEvent(ConfigEvent{Config: w.config})
 }
 
-//export gio_onFinishLaunching
-func gio_onFinishLaunching() {
-	close(launched)
-}
-
 func newWindow(win *callbacks, options []Option) {
-	<-launched
-	res := make(chan struct{})
-	runOnMain(func() {
-		w := &window{
-			redraw: make(chan struct{}, 1),
-			w:      win,
+	w := &window{
+		redraw: make(chan struct{}, 1),
+		w:      win,
+	}
+	w.loop = newEventLoop(w.w, w.wakeup)
+	if isMainThread() {
+		mainThreadWindow = w
+		defer func() { mainThreadWindow = nil }()
+		select {
+		case <-launched:
+		default:
+			// If we're the main thread, initialize the GUI.
+			C.gio_initApp()
+			close(launched)
 		}
-		w.loop = newEventLoop(w.w, w.wakeup)
+	} else {
+		<-launched
+	}
+	res := make(chan struct{}, 1)
+	runOnMain(func() {
 		win.SetDriver(w)
 		res <- struct{}{}
 		if err := w.init(); err != nil {
@@ -965,7 +1013,12 @@ func (w *window) init() error {
 }
 
 func osMain() {
-	C.gio_main()
+	C.gio_initApp()
+	close(launched)
+	for {
+		C.dispatchEvent()
+		gio_dispatchMainFuncs()
+	}
 }
 
 func convertKey(k rune) (key.Name, bool) {
@@ -1052,5 +1105,14 @@ func convertMods(mods C.NSUInteger) key.Modifiers {
 	return kmods
 }
 
+func (w *window) wakeup() {
+	runOnMain(func() {
+		w.loop.Wakeup()
+		if w != mainThreadWindow {
+			w.loop.FlushEvents()
+		}
+	})
+}
+
 func (AppKitViewEvent) implementsViewEvent() {}
 func (AppKitViewEvent) ImplementsEvent()     {}

app/os_macos.m

@@ -348,7 +348,6 @@ static BOOL isEqualNSCursor(NSCursor *c1, SEL name2) {
 	// Don't pass commands up the responder chain.
 	// They will end up in a beep.
 }
-
 - (BOOL)hasMarkedText {
 	int res = gio_hasMarkedText(self.handle);
 	return res ? YES : NO;
@@ -613,11 +612,22 @@ void gio_viewSetHandle(CFTypeRef viewRef, uintptr_t handle) {
 - (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
 	[NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
 	[NSApp activateIgnoringOtherApps:YES];
-	gio_onFinishLaunching();
+	// Force the [NSApp run] call to return.
+	[NSApp stop:nil];
+	NSEvent *dummy = [NSEvent otherEventWithType:NSEventTypeApplicationDefined
+	              location:NSZeroPoint
+	         modifierFlags:0
+	             timestamp:0
+	          windowNumber:0
+	               context:nil
+	               subtype:0
+	                 data1:0
+	                 data2:0];
+	[NSApp postEvent:dummy atStart:YES];
 }
 @end
 
-void gio_main() {
+void gio_initApp() {
 	@autoreleasepool {
 		[GioApplication sharedApplication];
 		GioAppDelegate *del = [[GioAppDelegate alloc] init];
@@ -641,6 +651,22 @@ void gio_main() {
 
 		globalWindowDel = [[GioWindowDelegate alloc] init];
 
+		// Runs until stopped by applicationDidFinishLaunching.
 		[NSApp run];
 	}
 }
+
+void gio_wakeupMainThread(void) {
+	@autoreleasepool {
+		NSEvent *dummy = [NSEvent otherEventWithType:NSEventTypeApplicationDefined
+		              location:NSZeroPoint
+		         modifierFlags:0
+		             timestamp:0
+		          windowNumber:0
+		               context:nil
+		               subtype:0
+		                 data1:0
+		                 data2:0];
+		[NSApp postEvent:dummy atStart:YES];
+	}
+}