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Miloslav Ciz 2021-12-27 00:21:13 -06:00
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# Graphical User Interface
Graphical user interface (GUI) is a visual [user interface](ui.md) that uses images; basically this includes icons, colors, shapes, mouse cursor, windows, buttons, pictures etc. This stands in contrast with [text user interface](tui.md) (TUI) which is also visual but only uses text for communication.
Expert computer users normally frown upon GUI because it is the "noobish", inefficient, limiting, hard to automate way of interacting with computer. GUI brings [complexity](complexity.md) and [bloat](bloat.md), they are slow, inefficient and distracting. We try no to use them and prefer the [command line](cli.md).
GUIs mostly use [callback](callback.md)-based programming, which again is more complicated than standard polling non-interactive I/O.
## How and When to Do GUI
GUI is not forbidden, it has its place, but today it's way too overused -- it should be used only if completely necessary (e.g. in a painting program) or as a completely optional thing build upon a more [suckless](suckless.md) text interface or [API](api.md). So remember: first create a program working without GUI and only then consider creating an optional GUI [frontend](frontend.md).
Still, when making a GUI, you can make it [suckless](suckless.md) and lighthweight. Do your buttons need to have reflections, soft shadows and rounded anti-aliased borders? No. Do your windows need to be transparent with light-refraction simulation? No. Do you need to introduce many MB of dependencies and pain such as [QT](qt.md)? No.
The ergonomics and aesthetic design of GUIs has its own field and can't be covered here, but just keep in mind some basic things:
- Don't have too many elements (buttons etc.) at the screen at once, it's confusing as hell and drives noobs away.
- Things must be intuitive, i.e. behave in a way that they normally do (e.g. main menu should be at the top of the window, not the bottom etc.).
- Just use your brain. If a button is important and often used, it should probably be bigger than a button that's used almost never, etc.