qt-everywhere-src-5.15.1/qtmacextras/examples/macextras/embeddedqwindow/main.mm

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#include <Cocoa/Cocoa.h>

#include "window.h"

#include <QtGui>
#include <qpa/qplatformnativeinterface.h>


NSView *myGetEmbeddableView(QWindow *qtWindow)
{
    // Make sure the platform window is created
    qtWindow->create();

    QPlatformNativeInterface *platformNativeInterface = QGuiApplication::platformNativeInterface();

    // Inform the window that it's a "guest" of a non-QWindow
    typedef void (*SetEmbeddedInForeignViewFunction)(QPlatformWindow *window, bool embedded);
    reinterpret_cast<SetEmbeddedInForeignViewFunction>(platformNativeInterface->
        nativeResourceFunctionForIntegration("setEmbeddedInForeignView"))(qtWindow->handle(), true);

    // Get the Qt content NSView for the QWindow from the Qt platform plugin
    NSView *qtView = (NSView *)platformNativeInterface->nativeResourceForWindow("nsview", qtWindow);
    return qtView; // qtView is ready for use.
}

@interface WindowCreator : NSObject {}
- (void)createWindow;
@end

@implementation WindowCreator
- (void)createWindow {	

    // Create the NSWindow
    NSRect frame = NSMakeRect(500, 500, 500, 500);
    NSWindow* window  = [[NSWindow alloc] initWithContentRect:frame
                        styleMask:NSTitledWindowMask |  NSClosableWindowMask | NSMiniaturizableWindowMask | NSResizableWindowMask
                        backing:NSBackingStoreBuffered
                        defer:NO];

    [window setTitle:@"NSWindow"];
    [window setBackgroundColor:[NSColor blueColor]]; // if you see blue something is wrong

    // Create the QWindow and embed its view.
    Window *qtWindow = new Window(); // ### who owns this window?
    NSView *qtView = myGetEmbeddableView(qtWindow);
    [window setContentView:qtView];

    // Show the NSWindow
    [window makeKeyAndOrderFront:NSApp];
}
@end

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    // Start Cocoa. Create NSApplicaiton.
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    [NSApplication sharedApplication];

    // Schedule call to create the UI using a timer.
    WindowCreator *windowCreator= [WindowCreator alloc];
    [NSTimer scheduledTimerWithTimeInterval:0 target:windowCreator selector:@selector(createWindow) userInfo:nil repeats:NO];

    // Starte the Cocoa event loop.
    [(NSApplication *)NSApp run];
    [NSApp release];
    [pool release];
    exit(0);
    return 0;
}