[Oberon] PO2013 - System.CloseTrack / System.ExtendDisplay

Jörg joerg.straube at iaeth.ch
Wed Apr 24 05:55:46 CEST 2019

Let‘s assume you made the following steps:
- open two files in the user track: viewer 1 and viewer 2
- System.Grow on viewer 2.
- Open an additional file: viewer 3

Now mark viewer3 and call System.CloseTrack
- It closes viewer 3 and grown viewer 2 and restores viewer 1 and 2


Am 24.04.2019 um 05:28 schrieb Andreas Pirklbauer <andreas_pirklbauer at yahoo.com>:

>> can anyone explain me how the *commands* System.CloseTrack
>> and System.ExtendDisplay are supposed to be used?
> System.CloseTrack with a viewer selected does the same
> as System.Close *after* the user has executed System.Grow
> on that viewer: it closes the overlaying track created by
> System.Grow and restores the one below it.
> System.ExtendDisplay was implemented on Ceres to use
> multiple physical monitors attached to the same computer.
> It is not implemented in FPGA Oberon (one would need to
> add memory for another frame buffer).
> --
> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> https://lists.inf.ethz.ch/mailman/listinfo/oberon

More information about the Oberon mailing list