FLUID edits and saves its state in text. A simple program can be made by putting all non-interface code including a main function into the. Most programs are more complex than this, so other. Each function defines one or more FLTK windows, and all the widgets that go inside those windows. A complex named object has punctuation such as '. This can be used to get the widgets into structures.
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This library is one of the fastest graphic libraries available, supports OpenGL and should be source compatible with different platforms Windows, Linux, Unix and Mac OS. FLTK Containers are widgets that contain other widgets such as panels, windows, etc. Csound provides the following container objects:. These objects allow the user to vary synthesis parameter values in real-time. Csound provides the following valuator objects:. There are other FTLK widgets that are not valuators nor containers:.
Also there are some other opcodes useful to modify the widget appearance :. There are also these general opcodes that allow the following actions:. Below is a simple example of Csound code to create a window. Notice that all opcodes are init-rate and must be called only once per session. The best way to use them is to place them in the header section of an orchestra, before any instrument.
Even though placing them inside an instrument is not prohibited, unpredictable results can occur if that instrument is called more than once. Each container is made up of a couple of opcodes: the first indicating the start of the container block and the last indicating the end of that container block.
Some container blocks can be nested but they must not be crossed. After defining all containers, a widget thread must be run by using the special FLrun opcode that takes no arguments. The previous code simply creates a panel an empty window because no widgets are defined inside the container. All widget opcodes are init-rate opcodes, even if valuators output k-rate variables.
This happens because an independent thread is run based on a callback mechanism. It consumes very few processing resources since there is no need of polling. This differs from other MIDI based controller opcodes. So you can use any number of windows and valuators without degrading the real-time performance. Buttons Button banks Labels Keyboard and Mouse sensing.
Updating widget value. Setting primary and selection colors of a widget. Setting font type, size and color of widgets. Resizing a widget. Hiding and showing a widget. FLTK Containers.
pyFLTK - Python Module for the FLTK GUI Toolkit
It was originally developed by Mr. Bill Spitzak and is currently maintained by a small group of developers across the world with a central repository in the US. Toolkits even FLTK are not what should be provided and documented as part of an operating system. The system only has to provide arbitrary shaped but featureless windows, a powerful set of graphics drawing calls, and a simple unalterable method of delivering events to the owners of the windows.
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