Amiga ROM Kernel Reference Manual: Devices by Inc. Commodore-Amiga

By Inc. Commodore-Amiga

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Gadgets, menus, requesters are the nuts and bolts of the Intuition GUI toolkit. Much of the code in an application that uses Intuition deals with the set up and operation of these important data objects. No matter how simple, complex, or fanciful your program design, it will fit within the basic Intuition framework of windows and screens, gadgets, menus and requesters. The users of the Amiga understand these basic Intuition elements and trust that the building blocks remain constant. This consistency ensures that a well-designed program will be understandable to the naive user as well as to the sophisticate.

All required data must be copied, including the name of the screen which is not part of the structure. Pointers that reference the list or structures attached to the list are not valid after releasing the lock. Once the lock is released, the screen pointers in the list (psn_Screen) may be tested for equality against other screen pointers, but referencing any part of the screen structure from this pointer is strictly illegal.

Table 3-1: Basic Amiga Display Modes With Release 2 of the operating system, many other display modes are available (these usually require a special monitor or ECS). All these display modes, including the specialized modes, are integrated through the graphics library display database. See the "Graphics Primitives" chapter for a complete list of all Amiga display modes. Intuition Screens 37 MULTIPLE SCREENS All Intuition display objects (such as windows and menus) take graphical characteristics from the screen.

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