Hyper-text

A hyper-text browser is built into MrEd's system. Hyper-text files contain links which can be clicked to move the cursor position to a tag in the same file or in another file.

There are three main frame classes for hyper-text files:

• mred:hyper-basic-frame% -- Implements the basic hyper-text functionality. Buttons at the top of the frame provide the standard ``Backward'', ``Forward'', and ``Home'' facilities of a hyper-text viewer.
• mred:hyper-view-frame% No editing is permitted. This is useful, for example, for a help facility inside an application.
• mred:hyper-make-frame% -- Provides tools for editing hyper-text files, including creating new tags and links among a group of hyper-text files.

The procedure mred:open-url accepts a url and creates a new mred:hyper-view-frame% object with the contents of the url.

The frame classes use mred:hyper-canvas% for the canvas and mred:hyper-edit% for the edit buffer.