\chapter{Commonly used libraries}		\label{sec:libraries}

In this chapter we document some of the libraries from the
\metafile{<pcehome>/prolog/lib} \productpl{} library. The libraries
described here are only the commonly used ones. For more information
check the file \file{Overview} in the library directory and the
source-code of the library.

\begin{itemize}
\newcommand{\secoverview}[2]{\item[\ref{sec:#1}]{\bf #2}\\}

    \secoverview{findfile}{Asking a filename}
This library defines the object @finder, instance of \class{finder}. The
finder allows for asking filenames.

    \secoverview{balloon}{Show help-balloon}
The library \pllib{help_message} registers balloon-text with graphical
objects.

    \secoverview{libdia}{Dialog utilities}
Toolbars and reporting facilities.  Includes example code for an
application framework.

    \secoverview{toc}{Table-of-content like hierarchies}
This library extends class \class{tree}, displaying a modern-style
hierarchy inside a window.  This library is used for displaying the
VisualHierachy and ClassHierarchy tools of the \product{} manual
toolkit.  See \chapref{online}.

    \secoverview{tabular}{Tabular layout}
Primitives for dealing with tables.

    \secoverview{libplot}{Plotting graphs and barcharts}
This section describes a number of libraries providing primitives for
drawing graphs and barcharts.

    \secoverview{mlingual}{Multi-lingual applications}
Discusses support for multi-lingual applications.

    \secoverview{dragdrop}{Drag and Drop Interface}
This library allows for drapping objects within one \product{}
application.

    \secoverview{httpd}{Playing WEB (HTTP) server}
Class \class{httpd} is a subclass of \class{socket} that deals with
the HTTP protocol.  It allows \product{} to act as a web-server.

    \secoverview{docrender}{Document rendering}
Primitives for rendering mixed text/graphics, handling fonts, alignment,
tables and other common text-layout primitives.
\end{itemize}

\newcommand{\libinput}[1]{\cleardoublepage\input{#1}}

\libinput{findfile.tex}
\libinput{balloon.tex}
\libinput{libdia.tex}
\libinput{toc.tex}
\libinput{tabular}
\libinput{libplot}
\libinput{mlingual.tex}
\libinput{dragdrop.tex}
\libinput{httpd}
\libinput{docrender}