Unit 'layers' Package
[Overview][Constants][Types][Procedures and functions][Variables][Index] [#amunits]

Reference for unit 'layers'

Layer handling





This unit contains the types and wrapper functions for the exec.library.



Native Amiga graphic functions (graphics.library)



Tag Handling, Date routines in utility.library


provides routines that are used to manage overlapping rectangular drawing areas that share a common display. Intuition uses the layers library to manage its system of windows.

The concept of a layer is closely tied to Intuition windows. A layer is a rectangular drawing area. A layer can overlap other layers and has a display priority that determines whether it will appear in front or behind other layers. Every Intuition window has an associated Layer structure. Layers allow Intuition and application programs to :

The layers library takes care of housekeeping: the low level, repetitive tasks which are required to keep track of where to place bits. The layers library also provides a locking mechanism which coordinates display updating when multiple tasks are drawing graphics to layers. The windowing environment provided by the Intuition library is largely based on layers.


Layers may not be created or used directly with Intuition screens. Intuition windows are the only supported method of adding layers to Intuition screens. Only the layer locking and unlocking functions are safe to use with Intuition. An application must create and manage its own View if it will be creating layers directly on the display.

Documentation generated on: 2021-07-30