Widget that monitors the value of a parameter and appears whenever it change to display its value.
A destructor is present on this object, but not explicitly documented in the source.
Redraws the whole widget without consideration for drawing only in dirty rects. That is a lot of maps to fill. On the plus side, this happen quite infrequently.
Called when a parameter value was changed, from an UI control or through the host. You'll probably want to call setDirtyWhole() or setDirty() in it to make the graphics respond to host changing a parameter.
Called when a parameter value _starts_ being changed due to an UI element.
Called when a parameter value _stops_ being changed.