Posted on December 2, 2019


This a tutorial can be used by the absolute FLTK beginner. In the course of the tutorial the most common widgets will be explained and you will gain a good. As you go through this tutorial, keep in mind that these are specific examples to help you see and learn FLTK. The most important piece of information you. I have posted the first (probably of several) tutorials about C++ and FlTk to help you do the project. These will be under Tutorials and the first.

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Some things to note: If you want to use the standard C main function as the entry point, FLTK includes a WinMain function that will call your main function for you. Newly created groups and their derived tutoriao implicitly call begin in the constructor, effectively adding all subsequently created widgets to itself until end is called. The console window is where you will see all of your output from your program that you generate using cout or printf.

Most importantly you need to understand classes, inheritance, pointers and tutorisl memory allocation before you can attempt to learn GUI programming. As you go through this tutorial, keep in mind that these are specific examples to help you see and learn FLTK.


The most basic interface consists of just a window by itself. Let’s look at another example. Although it’s already pretty stable this tutorial is about 1. Also, notice I don’t have to put a pointer in front of begin or end or show etc They are the method for having member function callbacks. Notice the second parameter is optional. Tutorjal inheritance, you can flt, certain functionalities of each widget, and configure it to suit your own application, without the need to code everything from scratch.

How to display a simulation of a circle bouncing against the walls of a 2D container in real-time. First I would like to say tutoriao callbacks in a class can only be static.

Callbacks are functions that are called when the value of a widget, a button in this case, changes. Doing so will automatically delete all the children of the window. This chapter teaches you the basics of compiling programs that use FLTK.

I have tried it with Mozilla, Firefox, Konqueror and Opera browsers. Hence, I have access to both the calling tutoorial and the input widget. Hence, the next line. Expand if necessary the source files folder. However, the button continues to exist in the main scope. The application may then ignore the events or respond to the user, typically by redrawing a button in the “down” position, adding the text to an input field, and so forth.


Beginner FLTK Tutorial

Also, compare how clean and efficient this sinlge line of communication is compared to the two ugly lines in the first example of talking widgets.

Therefore, I have access to the entire class in the callback with only the tiny overhead of passing an address!! More on this in the next section. What occurs as you minimize and restore the window? A complete list of all label options can be found in the section on Labels and Label Types.

FLTK Tutorial by Xu

I think it’s an acquired taste. This is the basis for GUI programming.

We feably rely upon exit 0 to clean up for us. But I personally don’t like declaring objects globally anyway.

I don’t want to duplicate too much stuff from the FLTK documentation, so at this point goto the above link. Firstly, you will learn to compile things by hand from a shell console.

C++ / FlTK Tutorial

Until you reach win. Mouse events are extremely important to handle because it is the most common input device used to interface with GUIs.

I generally try to name the callback function something intuitive.