FLUID

Short description: Graphical editor and GUI builder

FLUID

FLUID's code view window shows how the C++ output would look like if written on the disk.

Stable release| 1.3.8 (November 20, 2021; 4 years ago (2021-11-20)[1]) [±]
Type|

* GUI builder
* Linux on the desktop
* Human interface guidelines

License| GNU Lesser General Public Licence
Website| www.fltk.org
FLUID widget list window

FLUID (Fast Light User Interface Designer) is a graphical editor and GUI builder that is used to produce FLTK source code. FLUID edits and saves its state in text .fl files, which can be edited in a text editor for finer control over display and behavior.[2]

After designing the application, FLUID compiles the .fl file into a .cxx file, which defines all the objects from the .fl file, and an .h file, which declares all the global ones.[3] FLUID also supports localization of label strings using message files and the GNU gettext or POSIX catgets interfaces.[4]

A flowchart showing the steps needed to compile FLUID-generated code

A simple program can be made by putting all non-interface code (including a `main` function) into the .fl file, thus making the .cxx file a single source file to compile. Most programs are more complex than this, so other .cxx files can be written that call the FLUID functions. These .cxx files must `#include` the .h file, or they can #include the .cxx file so it still appears to be a single source file.

Normally the FLUID file defines one or more functions or classes, which output C++ code. Each function defines one or more FLTK windows, and all the widgets that go inside those windows.

Widgets created by FLUID are "named", "complex named", or "unnamed". A named widget has a legal C++ variable identifier as its name (i.e. only alphanumeric and underscore), and is defined by a global variable or class member that will point at the widget after the function defining it is called. A complex named object has punctuation such as '.' or '->' or any other symbols in its name. In this case, FLUID assigns a pointer to the widget to the name, but does not attempt to declare it. This can be used to get the widgets into structures. An unnamed widget has a blank name and no pointer is stored.

Widgets may either call a named callback function that one writes in another source file, or one can supply a small piece of C++ source and FLUID will write a private callback function into the .cxx file.

## Contents

* 1 Code View window
* 2 Widget bin window
* 3 See also
* 4 References
* 5 External links

## Code View window

While editing the program FLUID the user can look at the Code View window which shows exactly how the C++ output of the program would look. The Code View window supports auto refreshing (when something in the program is changed, Code View will automatically change the source code being shown) which can be disabled by the user. It won't let the user change the code being shown through it. Code View is part of FLUID and is not automatically shown on startup. It can be enabled through FLUID's menu.

## Widget bin window

FLUID's widget bin window

## See also

* Glade Interface Designer
* Qt Creator
* Rapid application development
* Linux on the desktop

## References

1. ↑ https://www.fltk.org/articles.php?L1782+I0+T+P1+Q
2. ↑ Reference, from the FLTK documentation
3. ↑ FLTK 1.3.3: Programming with FLUID, from the FLTK manual.
4. ↑ fltk.org/doc-1.3/fluid.html#fluid_i18n FLTK 1.3.3: Programming with FLUID, FLTK manual

## External links

* FLTK & FLUID in motion - A FLUID tutorial
* Video tutorial on FLUID covering only the basics
* Erco's FLTK Cheat Page
* The flPhoto user-interface was done completely with FLUID.

* v
* t
* e

List of widget toolkits

Low-level|

| On AmigaOS|

* Intuition

|

On Classic Mac OS,
macOS|

| Unknown, native|

* Macintosh Toolbox

|

* Carbon

On Windows|

* Windows API

On Unix,
under X11|

* Xlib
* XCB
* X Toolkit Intrinsics, Xt, X-Toolkit

On BeOS, Haiku|

* BeOS, ZETA, Haiku

On cross-platform|

| CLI|

* OpenTK

|

* GDK
* SDL

Java|

* JOGL

On Android|

| CLI|

* Xamarin.Android

|

High-level|

| On AmigaOS|

* BOOPSI
* MUI
* ReAction GUI
* Zune

|

On Classic Mac OS,
macOS|

| Object Pascal|

* MacApp (v1, v2)

|

Objective-C,
Swift|

| Desktop|

* Cocoa

|

Mobile|

* Cocoa Touch

C++|

* MacApp (v3)
* PowerPlant
* THINK Class Library

CLI|

| Desktop|

* Xamarin.Mac

|

Mobile|

* Xamarin.iOS

On Windows|

| CLI|

| Desktop|

* Windows Forms
* XAML (Silverlight, WinRT XAML, WPF)
* XNA Framework

|

Web|

* XAML (Silverlight)

Mobile|

* XNA Framework

C++|

* MFC
* ATL
* WTL
* OWL

Object Pascal|

* VCL

On Unix,
under X11|

* Athena (Xaw)
* LessTif
* Motif
* OLIT
* XForms

On Android|

| C++|

* Qt for Android

|

Cross-platform,
by language|

| C|

* GTK
* IUP
* Tk
* wxC
* XForms
* XVT

|

C++|

* CEGUI
* CLX
* FLTK
* FOX toolkit
* GLUI
* Gtkmm
* JUCE
* Nana
* Qt
* Rogue Wave Views
* TnFOX
* Ultimate++
* VCF
* Wt
* wxWidgets
* YAAF
* SFML

Objective-C|

* GNUstep

CLI|

| Desktop|

* Gtk#
* Tao (OpenTK, TaoClassic)
* wx.NET
* UIML.NET
* MonoGame

|

Web|

* Moonlight

Mobile|

* MonoGame
* Xamarin.Forms

* DFL
* DlangUI
* DWT
* GtkD
* QtD
* wxD

Flash|

* Apache Flex (MXML)

Haskell|

* Gtk2Hs
* wxHaskell

Java|

| Desktop|

* AWT
* FXML (JavaFX)
* Qt Jambi
* Swing
* SWT
* wx4j
* jUIML

|

Web|

* GWT
* FXML (JavaFX)

Mobile|

* LWUIT

JavaScript|

* Dojo Toolkit
* Echo
* Ext JS
* Google Closure
* jQuery UI
* Qooxdoo
* YUI

Common Lisp|

* CAPI
* CLIM
* Common Graphics
* Ltk
* McCLIM

Lua|

* IUP
* wxLua

Pascal|

| Desktop|

* LCL

|

Mobile|

* LCL

Object Pascal|

| Desktop|

* CLX
* fpGUI
* IP Pascal
* LCL

|

Mobile|

* LCL

Perl|

* Perl/Tk
* wxPerl

PHP|

* PHP-GTK
* PHP-Qt
* wxPHP

Python|

* PyGObject
* PyGTK
* Pyjs
* PyQt
* PySide
* Tkinter
* wxPython

Ruby|

* Shoes
* FXRuby
* Ruby-GNOME2
* qtbindings
* QtRuby
* wxRuby

Tcl|

* Tcl/Tk

XML|

* GladeXML
* Lively Kernel
* Pyjs
* Rialto Toolkit
* XAML
* XUL
* UXP
* Wt

shell|

* whiptail
* dialog

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