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Dialog Control Language
Dialog Control Language (DCL) is a high-level description language and interpreter within AutoCAD for creating simple graphical dialogs. AutoLISP extensions use it to interact with the user in the AutoCAD environment.
==Features and usage==
Unlike other major GUI APIs, DCL is not a complete GUI toolkit for application programming. It is only intended for providing simple dialogs within AutoCAD. It includes basic form widgets such as text boxes, buttons, checkboxes and list boxes. DCL is object-oriented; it allows re-use through inheritance and composition.
DCL syntax is based on defining and using 'tiles'. A 'tile' represents a GUI widget such as a text box or a text label. Tiles also represent widgets that hold other widgets, such as columns, radio button groups and the dialogs themselves. DCL provides built-in tiles for all major widgets, and new tiles can be defined through inheritance and composition of other tiles.
DCL allows interactions with the dialog at run-time by Lisp code. Certain widgets can have actions associated with them by naming an AutoLISP function to be run, and values to be passed to it. Unlike other types of GUIs, DCL dialogs cannot be changed substantially at run time. The contents of certain widgets such as text boxes and list boxes can be changed, but widgets cannot be removed from or added to the dialog.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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