Detect screen switching....IDCMP_ACTIVEWINDOW and IDCMP_INACTIVEWINDOW

NovaCoder · 13 August 2011, 01:43

Is it possible to detect when your screen is not longer the visible screen (eg the user has switched to a new screen).

I tried catching 'IDCMP_ACTIVEWINDOW and IDCMP_INACTIVEWINDOW' but they are only sent if the user actually clicks with the mouse on a different screen.

Minuous · 13 August 2011, 07:16

You could probably look at some fields of GfxBase or similar to get the frontmost screen. Bear in mind of course that a screen can be visible and yet not frontmost though.
Maybe screennotify.library has some useful functionality for this, I haven't investigated that possibility.

DrCinicus · 13 August 2011, 23:27

Quote:

Originally Posted by NovaCoder

Is it possible to detect when your screen is not longer the visible screen (eg the user has switched to a new screen).

I tried catching 'IDCMP_ACTIVEWINDOW and IDCMP_INACTIVEWINDOW' but they are only sent if the user actually clicks with the mouse on a different screen.

You can check the ib_FirstScreen in IntuitionBase, comparing the value with your screen pointer. You have to check regularly so you can use an INTUI_TICK event or a vbl interrupt (I saw this on a demo startup code).

Bye

NovaCoder · 14 August 2011, 05:06

yep it looks like there's no easy way to do it via an event, oh well never mind

Shadowfire · 14 August 2011, 18:17

That kind of user activity is meant to be transparent to the application.

13 August 2011, 01:43	#1
NovaCoder Registered User Join Date: Sep 2007 Location: Melbourne/Australia Posts: 4,411	Detect screen switching....IDCMP_ACTIVEWINDOW and IDCMP_INACTIVEWINDOW Is it possible to detect when your screen is not longer the visible screen (eg the user has switched to a new screen). I tried catching 'IDCMP_ACTIVEWINDOW and IDCMP_INACTIVEWINDOW' but they are only sent if the user actually clicks with the mouse on a different screen.

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13 August 2011, 07:16	#2
Minuous Coder/webmaster/gamer Join Date: Oct 2001 Location: Canberra/Australia Posts: 2,673	You could probably look at some fields of GfxBase or similar to get the frontmost screen. Bear in mind of course that a screen can be visible and yet not frontmost though. Maybe screennotify.library has some useful functionality for this, I haven't investigated that possibility.

14 August 2011, 05:06	#4
NovaCoder Registered User Join Date: Sep 2007 Location: Melbourne/Australia Posts: 4,411	yep it looks like there's no easy way to do it via an event, oh well never mind

14 August 2011, 18:17	#5
Shadowfire Registered User Join Date: Aug 2001 Location: Connecticut USA Posts: 617	That kind of user activity is meant to be transparent to the application.

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