The software I am designing has properties panel and some selectable objects. When selecting a single object, its a straight forward design since the knobs and buttons will show the value of the selected item. But what about when a multi select has been made?
The current version of the software shows the values of the first selected item, no matter how many items selection have been selected.
The image below shows 3 scenarios in the software, with the first, the second and last, both objects selected:
There is a standard on how to show check box states in this scenario - Adobe uses this (watch the "Align to pixel grid" property in the bottom right corner):
The yellow don't align, the red align, both selected shows a line as "multi state".
How can this design language be translated to a on/off button or a knob?