![]() While systems to deal with a complex graphical user interface could be written in standard Pascal or almost any other programming language, it is much easier to use an object-oriented system, in which each graphical object on the screen can have all its properties and the procedures and functions associated with its use kept together in a common structure.Ĭonsider the analogy of a blood sample collected in a hospital or a doctor's office. The user is expected to move a mouse or other pointer/selection tool over the screen, to select actions which are to be performed in response to a mouse button click or a key-press.
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