Preface

This manual describes the Fast Light Tool Kit ("FLTK") version 1.3.8, a C++ Graphical User Interface ("GUI") toolkit for UNIX, Microsoft Windows and Apple OS X.

Each of the chapters in this manual is designed as a tutorial for using FLTK, while the appendices provide a convenient reference for all FLTK widgets, functions, and operating system interfaces.

This manual may be printed, modified, and/or used under the terms of the FLTK license provided in Software License.

Organization

This manual is organized into the following chapters and appendices:

• Introduction to FLTK
• FLTK Basics
• Common Widgets and Attributes
• Designing a Simple Text Editor
• Drawing Things in FLTK
• Handling Events
• Adding and Extending Widgets
• Using OpenGL
• Programming with FLUID
• Advanced FLTK
• Unicode and UTF-8 Support
• FLTK Enumerations
• GLUT Compatibility
• Forms Compatibility
• Operating System Issues
• Migrating Code from FLTK 1.0 to 1.1
• Migrating Code from FLTK 1.1 to 1.3
• Developer Information
• Software License
• Example Source Code

Conventions

This manual was generated using Doxygen (see http://www.doxygen.org/) to process the source code itself, special comments in the code, and additional documentation files. In general, Doxygen recognizes and denotes the following entities as shown:

• classes, such as Fl_Widget,
• methods, such as Fl_Widget::callback(Fl_Callback* cb, void* p),
• functions, such as fl_draw(const char *str, int x, int y),
• internal links, such as Conventions,
• external links, such as http://www.stack.nl/~dimitri/doxygen/

Other code samples and commands are shown in regular courier type.

Abbreviations

The following abbreviations are used in this manual:

X11

The X Window System version 11.

Xlib

The X Window System interface library.

MS Windows, WIN32

The Microsoft Windows Application Programmer's Interface for Windows 2000, Windows XP, Windows Vista, and Windows 7. FLTK uses the preprocessor definition WIN32 for the 32 bit and 64 bit MS Windows API.

OS X, APPLE

The Apple desktop operating sytem OS X 10.0 and later. MacOS 8 and 9 support was dropped after FLTK 1.0.10. FLTK uses the preprocessor definition APPLE for OS X.

Copyrights and Trademarks

FLTK is Copyright 1998-2021 by Bill Spitzak and others. Use and distribution of FLTK is governed by the GNU Library General Public License with 4 exceptions, located in Software License.

UNIX is a registered trademark of the X Open Group, Inc. Microsoft and Windows are registered trademarks of Microsoft Corporation. OpenGL is a registered trademark of Silicon Graphics, Inc. Apple, Macintosh, MacOS, and Mac OS X are registered trademarks of Apple Computer, Inc.

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