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Xlib (also known as libX11) is an X Window System protocol client library written in the C programming language. It contains functions for interacting with an X server . These functions allow programmers to write programs without knowing the details of the X protocol .
For example, if a client wishes a window to be created, it requests the server to create one and (in case of success) gets in return an identifier the server associated with the newly created window. The identifier can be later used by the client to request, for example, a string to be drawn in the window.
X Toolkit Intrinsics (also known as Xt, for X toolkit) is a library that implements an API to facilitate the development of programs with a graphical user interface (GUI) for the X Window System.
the Xlib functions that send requests block until the appropriate replies, if any is expected, are received; in other words, an X Window client not using Xlib can send a request to the server and then do other operations while waiting for the reply, but a client using Xlib can only call an Xlib function that sends the request and wait for the ...
For example, a resource can specify that the background of every component of the xmail program must be red: xmail*background: red. However, when a program (e.g., the xmail program itself, when it wants to find out which background color to use) accesses the resource database via Xlib functions, it can only request the value of a specific resource.
XCB (X protocol C-language Binding) is a library implementing the client-side of the X11 display server protocol. XCB is written in the C programming language and distributed under the MIT License. The project was started in 2001 by Bart Massey and aims to replace Xlib.
Its graphics are GPU-accelerated and it supports styling, and mixing its own implementation controls with native system controls, which lets apps use native behaviour where it's important (for example, for IME text input.) IP Pascal uses a graphics library built on top of standard language constructs. Also unusual for being a procedural toolkit ...
For example, the SlowKey control can be used to ignore short keypresses. Another control is the MouseKeys , which makes some keypresses to simulate mouse movements. The control only indicates whether this simulation is active or not; which keys produce the movement is not considered a part of the control, but is specified by attaching actions ...