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About This Reference

This chapter includes:

What you'll find in this guide

The Photon Widget Reference describes the global data structures and the widgets defined in the Photon toolkit, along with their resources and any associated convenience functions. It's intended for developers of Photon applications.

Note: If you're familiar with earlier versions of Photon, you should read the What's New appendix to find out how the widgets have changed in this release.

For information about: See:
Data structures Global Data Structures
Widget classes Widgets
What is new or changed in this release What's New
Explanations of Photon terms Glossary

Since widgets inherit a lot of behavior from their parent classes, you should make yourself familiar with the fundamental classes, especially PtWidget, PtBasic, and PtContainer.

Note: This reference doesn't include contributed widgets. You'll find the documentation for them (if any) in their source files.

Typographical conventions

Throughout this manual, we use certain typographical conventions to distinguish technical terms. In general, the conventions we use conform to those found in IEEE POSIX publications. The following table summarizes our conventions:

Reference Example
Code examples if( stream == NULL )
Command options -lR
Commands make
Environment variables PATH
File and pathnames /dev/null
Function names exit()
Keyboard chords Ctrl-Alt-Delete
Keyboard input something you type
Keyboard keys Enter
Program output login:
Programming constants NULL
Programming data types unsigned short
Programming literals 0xFF, "message string"
Variable names stdin
User-interface components Cancel

We use an arrow (→) in directions for accessing menu items, like this:

You'll find the Other... menu item under Perspective-->Show View.

We use notes, cautions, and warnings to highlight important messages:

Note: Notes point out something important or useful.

Caution: Cautions tell you about commands or procedures that may have unwanted or undesirable side effects.

WARNING: Warnings tell you about commands or procedures that could be dangerous to your files, your hardware, or even yourself.

Note to Windows users

In our documentation, we use a forward slash (/) as a delimiter in all pathnames, including those pointing to Windows files.

We also generally follow POSIX/UNIX filesystem conventions.

Navigation buttons

At the top and bottom of our HTML docs, you'll see some or all of these buttons:

Use this button: To move:
Previous To the previous part of the document.
Contents “Up” in the document:
  • In a prose book, this typically takes you to About This Guide.
  • In a reference book, it takes you to the listing of items that start with a given letter. For example, if you're looking at the docs for abs(), this button takes you to the listing of the functions that start with A.
Keyword index To the keyword index.
Next To the next part of the document.

Technical support

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