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Overview

MrEd is implemented in two layers. While it is not necessary to think of these layers as separate, the names of built-in classes, procedures, and constants indicate the source layer of the value through the wx: or mred: prefix; identifiers prefixed with wx: are part of MrEd's low-level GUI engine, while identifers prefixed with mred: are part of the high-level system that is loaded at start-up time.

Functionally, the toolbox can be divided into six parts:

support for building complete applications,
the core toolbox provides, which primitive windows and drawing tools.
the media toolbox, which provides primitives for text and graphics editing,
the geometry management toolbox, which provides window and control classes with automatic sizing and placement,
the application toolbox, which provides classes for building complete applications with mulitple windows, menu bars, key bindings, and preferences, and
the test suite engine, which provides support for implementing whole applications.

PLT