In macOS, when a window is in full-screen mode and the mouse is moved to the top, the window toolbar will appear. How can I prevent it from displaying?

[Linlccc]

In macOS, when a window is in full-screen mode and the mouse is moved to the top, the window toolbar will appear. How can I prevent it from displaying?

[Linlccc]

I want the effect to be like Safari in full-screen mode.

[maxkatz6]

You need to call MacOS APIs for that https://developer.apple.com/documentation/appkit/nsmenu/setmenubarvisible(_:)?language=objc

Something like:

internal class MacOSInterop
{
    public static void SetNSMenuBarVisible(bool visible)
    {
        // Get the NSMenu class
        var nsMenuClass = GetClass("NSMenu");
        // Get the selector for the setMenuBarVisible: method
        var setMenuBarVisibleSelector = GetSelector("setMenuBarVisible:");
        // Call the setMenuBarVisible: method.
        ObjcMsgSend(nsMenuClass, setMenuBarVisibleSelector, visible);
    }

    [DllImport("/usr/lib/libobjc.A.dylib", EntryPoint = "objc_getClass")]
    private static extern IntPtr GetClass(string name);

    [DllImport("/usr/lib/libobjc.A.dylib", EntryPoint = "sel_registerName")]
    private static extern IntPtr GetSelector(string name);

    [DllImport("/usr/lib/libobjc.A.dylib", EntryPoint = "objc_msgSend")]
    private static extern void ObjcMsgSend(IntPtr receiver, IntPtr selector, bool arg);
}

[Linlccc]

Thank you for your reply 🙏

The result is not quite what I wanted. After calling the above method, the entire menu bar is hidden, and I just didn't want the toolbar of the three buttons to be displayed.

I am a beginner on the macOS platform and don't know which API to use, 🙏