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Lazarus Pascal - macOS - Make FullScreen button (green) only maximize the window (not fullscreen)


 Hans
(@hans)
Noble Member Admin
Joined: 8 years ago
Posts: 1891
Topic starter  

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;

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