OL3-ext: control Toggle
is an ol.control.Button
with an active/deactive state.
If can be created with an ol.interaction
and controls its activation.
It can be grouped into an ol.control.Bar
with a toggleOne
propertie to have only one activated at a time.
You can compose toolbars with it (see the control bar example
When adding Toggle control to a bar, an option bar can be nested to add a subbar visible when the control is active (see the sub-bar example