Am 12.08.26 um 17:49 schrieb Robin Gareus:
On 2026-08-12 5:30 PM, Hermann Meyer wrote:
Am 11.08.26 um 14:10 schrieb Fons Adriaensen:
Hello all,
Some more questions on my way to grok LV2
1. Should hosts echo parameter changes to the GUI if
the change came from the GUI ?
Jalv doesn't, Ardour does. That can make continuous
changes (e.g. a fader) look erratic as the echo will
probably arrive when the widget has already moved
to the a new value.
You should at least be prepared for such a behave and break the loop
on your side.
Remember, the host is the house keeper and the plug is the guest.
The reason for this is that the parameter may be automated. Active
automation overrides user manual control, unless the automation mode
is "Touch" and the plugin sends a touch event for the given control
3. A GUI may want to show an optional second window
Don't do that. This is frowned upon and causes problems on systems
without z-axis positioning API for windows.
The only system with a z-axis window stacking API specifically
mentions that plugins SHOULD NOT open additional windows in their
human interface guidelines.
libxputty take care of that, and, keep any separate window as child of
the main window, regardless if it is created on root or on parent
window. I never see a issue with that, nor do I ever get a report about.
--
robin
