David Barth wrote: > However, using the XScreenSaver extension, the X server is maintaining > this information for us, so that we can track the idle time, without > doing any polling, in particular when no notification is on display.
Yes, this gives us a binary "it has moved" or "it has been idle", which is fine for the screensaver because the screensaver only cares if you have been COMPLETELY idle. We might care about a little more detail, like, "is your attention in this part of the screen", which is not the same. For example, if I left the cursor in the top right of the screen after closing a window and my attention is now somewhere else, but I just nudge the touchpad a *little*, the XScreenSaver API will say "not idle", while we probably want to infer that the users attention is not there. Attention is a factor of amount of movement and other activity like clicking. Finally, does the XScreenSaver API separate out mouse movement from keyboard movement? If I leave a mouse pointer in the top right of the screen, but am typing into a window in the bottom left, we want to treat that mouse pointer as idle even though I am busy typing precisely because we are interested in a different region to where the typing is happening. Mark
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