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- AutoIdle Documentation 12/21/87
- Larry Rosenstein
-
- This is yet another of those automatic screen blanking utilities, called
- AutoIdle. It should be compatible with all versions of the Macintosh,
- including a Mac II with multiple screens. It is also compatible with Multifinder.
-
- To use it, you place the AutoIdle file in your System Folder and reboot the
- machine. After 5 minutes of inactivity, the screen will be blanked and an
- icon will appear at random places of the screen. In general, AutoIdle tries
- to display the icon of the application that is running. You can modify this
- as described below. The name of the application will appear under the
- icon.
-
- To restore the screen, move the mouse, click the mouse, hit a key, or
- insert a diskette. The screen will also be restored if a window is created
- or removed from the screen. (This is useful when downloading a file, for
- example, since you will notice when the download finished.) Any of these actions
- also resets the 5 minute delay.
-
- If you move the mouse in a special rectangle of the screen, it will be
- blanked immediately. Initially this is defined by the coordinates (0, 0) and
- (2, 2), but can be changed. You must leave the mouse in that position for
- about 1/2 second before the screen will be blanked.
-
- The advantage of AutoIdle is that it doesn't take over the machine when it
- blanks the screen. In fact you can be downloading a file from a BBS and the
- screen can be blanked, yet the download will continue. The same is true of
- printing.
-
- The downside of this is that AutoIdle does not save the original screen
- display and relies on the application to regenerate it. Also, it doesn't try
- to prevent the application from changing the display. If the application
- does change the display the utility will just blank the screen again. (You
- can see why it doesn't make sense for the utility to save the screen
- display, since the application might be changing it.)
-
- AutoIdle works by intercepting the GetNextEvent and TickCount traps in the
- Macintosh, and blanking/restoring the screen when the application calls those
- traps. This design makes it very unobtrusive, but it also means that AutoIdle
- won't get control unless the application calls one of these traps. So if you are
- doing a long computation, the screen might never be blanked.
-
- You can customize AutoIdle using ResEdit. Inside the file is a resource of
- type 'idle'. The first 4 bytes of the resource is the delay (in 1/60 seconds)
- until blanking the screen; the next 4 bytes the delay between moving the
- icon; the next 8 bytes is the magic rectangle (in screen coordinates). The
- rest of the resource is a list of possible icons to use.
-
- The icon list starts with 2 bytes which is the number of icons. Then comes
- a series of pairs (resource type, resource ID). To choose the icon, AutoIdle
- just runs down the list until it finds one of those resources. The default
- list consists of:
-
- ICN# 128 usually the application's icon
- ICN# 131 folder icon in Finder
- ICN# 3 Mac icon in System file
-
- If AutoIdle doesn't find an icon, it uses a gray rectangle. This will never
- happen in the default case because ICN# 3 will always be found.
-
- Accompanying AutoIdle should be a file called AutoIdle TMPL. If you open
- this file in ResEdit you will find a resource of type TMPL. If you paste this
- resource into ResEdit itself, then you will be able to edit the 'idle'
- resource in a convenient way (rather than as hex). If you do this, make
- sure that the ID of the AutoIdle TMPL resource doesn't conflict with
- another TMPL in your version of ResEdit.
-
- Please send all your comments & suggestions to me. One things I would
- like to do is write an application that allows you to customize the 'idle'
- resource without using ResEdit, but I haven't done it yet.
-
- Send those cards & letters to:
-
- Larry Rosenstein
- Apple Computer, Inc.
- 20525 Mariani M/S 32-E
- Cupertino, CA 95014
-
- Usenet: {sun, nsc}!apple!lsr
- CSNet: lsr@Apple.com
- AppleLink: Rosenstein1
-
-
- Change History:
-
- 1.0a7 11/6/87: First version posted to Usenet & beyond.
- 1.0a10 12/21/87: Second version posted to Usenet.
- Fixed bug with not preserving the current port
- (some applications would get a funny font in its
- menus, or start using the wrong port).
- Made mouse move restore the screen.
- Clicking is not required to blank the screen immediately.
- Use a patch to PostEvent to tell when an event comes in.
- Calls to TickCount can cause screen blanking.
- Preserve most of the registers.
- Fixed problem with color support; needed to set the
- current GDevice before calling Index2Color.
- Shrink the GrayRgn to nothing when blanking to prevent
- "behaved" applications from drawing on the screen.
-
-