Download The official GEOS programmer's reference guide by Michael Farr, Berkeley Softworks PDF

By Michael Farr, Berkeley Softworks

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Additional info for The official GEOS programmer's reference guide

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J I In the following sections we show exactly what programming under GEOS is like by building the first part of a sample application using a simple initialization routine which clears the screen and puts up a few icons. Each of the icons when activated will dispatch a ! I service routine which will again clear the screen and then put up a different menu structure. We describe how icons and menus are defined under the GEOS Kernal. After this we include a short section that explains one way of getting your test application onto disk and running it with GEOS.

J ^ n THE OFFICIAL GEOS PROGRAMMER'S REFERENCE GUIDE An event is defined as 1. a user initiated action or 2. a user defined time based process. An example of a process would be a routine which is run every second to update a n _ I ) clock. The application programmer provides the routine and tells the GEOS Kernal how often to run it. user Every time that amount of time elapses an event is triggered. When there are no actions place only the applications can run entirely event driven. GEOS Kernal code is running.

The various routines and options for menu support including DYNAMICSUB_MENU are summarized in the following. ^ U U u u u u n n 35 THE OFFICIAL GEOS PROGRAMMER'S REFERENCE GUIDE Menu Constants Menu Type Values HORIZONTAL Indicates that the items of the menu will be arranged horizontally: | Item 1 | Item 2 | VERTICAL Item 3 | Indicates that the items of the menu will be arranged vertically: CONSTRAINED Indicates that mouse is constrained to the area of the menu. Mouse can still be moved off the top of the menu to cancel the menu and avoid any menu action.

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