How to display "watermark" on top of all applications in OSX?

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YourChief2013-04-02 17:24:48

macOS

YourChief, 2013-04-02 17:24:48

Hello.
I had a task to write a tiny application for OS X, which is a component with some kind of picture (jpg/png) displayed in the corner of the screen and on top of all windows.

I haven't developed anything for OSX/iOS and I can't even choose the right components for the solution. It would be great if you showed me the direction of movement, because it’s impossible to google something sane.
Thank you.

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3 answer(s)

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vk2, 2013-04-02
@vk2

The XCode examples have a RoundTransparentWindow showing how to display an arbitrary shaped window with arbitrary transparency; plus examples in Google "xcode always on top window" (so that it is always on top), you can handle the rest as you go :)

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Alexey Akulovich, 2013-04-02
@AterCattus

If you need it to record a screencast, can you just put any watermark on the resulting video?

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iStyx, 2013-04-03
@iStyx

You need to track windowWillAppear/windowDidAppear, windowWillMove/windowDidMove, etc. alerts. Having received information about the window, draw your own watermark over it.