System layers are used in the background and foreground of each row. A background layer gets drawn before the activities
are drawn while a foreground layer gets drawn after the activities are drawn. Each layer is specialized on drawing one
type of information: current time, selected time intervals, grid lines, and so on. The graphics view manages the layers
in two lists and provides convenience methods to easily look them up.
System layers are used in the background and foreground of each row. A background layer gets drawn before the activities are drawn while a foreground layer gets drawn after the activities are drawn. Each layer is specialized on drawing one type of information: current time, selected time intervals, grid lines, and so on. The graphics view manages the layers in two lists and provides convenience methods to easily look them up.
1.0
typescript GraphicsBase.getForegroundSystemLayers(),GraphicsBase.getBackgroundSystemLayers(),GraphicsBase.getForegroundSystemLayer(Class),GraphicsBase.getBackgroundSystemLayer(Class)