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Interesting question I found on the Lazarus Forum for which I found an answer:
In macOS the green button (upper left corner of each window) makes a window FULLSCREEN and not (like with other operating systems) just maximizes the window.
There is a trick to change this behavior though, so here 2 functions I made to disable and enable the fullscreen behavior.
You can disable the fullscreen behavior (becomes maximize) and enable it again if needed.
procedure DisableFullscreenButton(theForm: TForm); var theWindow: NSWindow; begin theWindow := NSView(theForm.Handle).window; // Form1 is the name of the main form - adjust as necessary theWindow.setCollectionBehavior(theWindow.collectionBehavior or NSWindowCollectionBehaviorFullScreenAuxiliary); end; procedure EnableFullscreenButton(theForm: TForm); var theWindow: NSWindow; begin theWindow := NSView(theForm.Handle).window; // Form1 is the name of the main form - adjust as necessary theWindow.setCollectionBehavior(theWindow.collectionBehavior and NSWindowCollectionBehaviorFullScreenPrimary); end;
