In TRichEdit component, we can do some “Zoom-In” or “Zoom-Out” effect for the Text inside like we see in MS-Word application. So, the text inside our application (TRichEdit) will looks giant “bigger” or tiny “smaller” with a certain key/mouse combination.
Actually, those text zoom-in or zoom-out feature is already supported by TRichEdit by default.
And how we use those feature ???
for further reading, please read this article : http://delphimiracles.blogspot.com/2007/01/zoom-in-and-zoom-out-text-in-trichedit_21.html