How to Override Delphi Form's Restore Operation?

in Delphi TIPS :: The WM_SYSCOMAND can be used to trap the restore window operation. When the form is maximized the "Maximize" button changes its look and operation. Clicking the restore button restores the window to its previous (normal, before it was maximized) position and size. By overriding (changing) the default "restore" action, you can for example, create a Delphi form that can be only mimimized or maximized.

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Related:

• Handling Windows Messages
• Capture Maximize/Minimize Menu button click
• Display a Password Dialog when Restoring a Delphi Application from the TaskBar