From the Gtk2Hs web site: Gtk2Hs is a GUI library for Haskell based on Gtk+. +Gtk+ is an extensive and mature multi-platform toolkit for creating graphical user interfaces.
+This tutorial is aimed at the intermediate level Haskell programmer, and covers what is +needed to write the most common GUI interfaces. This is summed up by the table of contents of this +tutorial. For advanced users, however, the Gtk2Hs API documentation contains much more.
+Gtk+ is largely a library of components called 'widgets', which are organized in an object +oriented hierarchy. In Gtk2Hs this is implemented by giving each widget both a Haskell type and a Haskell +type class. Thus the Haskell type system is rigorously preserved, and the programmer has all +the advantages of Haskell type checking by the Glasgow Haskell compiler and interpreter. Gtk2Hs also +has many functions for type casting.
+Widgets have attributes which control their behavior and appearance. There are two general functions +to get and to set attributes.
+To set one or more attributes of a widget use:
+set widget [widgetAttr1 := foo, widgetAttr2 := fie, widgetAttr3 := bar]+
To get an attribute of a widget use:
+x <- get widget widgetAttr1+
Almost always there are specific functions to set and get widget attributes too, but in future +these will be deprecated. For now, however, use of the functions is more common.
+What happens in a Gtk2Hs application is determined by user actions, like mouse clicks, button
+presses, selection of radio buttons and so on. These are called events and may result in signals
+ being emitted. Information about events, for example whether the user clicked a right or left
+ mouse button, may be captured in data fields that can be queried by the Gtk2Hs programmer.
+ Signals are usually handled by specific functions for that type of widget. They are listed
+ in the Signals section of the API documentation for that widget.
+ Most take a function of type IO () as parameter, but many have some result.
+ The Gtk2Hs programmer, of course, must write these parameter functions, which determine the response
+ to the user action.
Finally, setting up a widget tree for your application and determining the visual + layout (packing) can be done visually with the Glade interface designer. Gtk2Hs fully + supports Glade and there is an introductory tutorial on the Gtk2Hs web site. Using Glade + is actually recommended over the programmatic approach which is described in this tutorial.
+ + + + hunk ./docs/tutorial/Tutorial_Port/chap2.xhtml 14 - + hunk ./docs/tutorial/Tutorial_Port/chap2.xhtml 183 - + hunk ./docs/tutorial/Tutorial_Port/chap7-2.xhtml 21 - Next + hunk ./docs/tutorial/Tutorial_Port/chap7-2.xhtml 333 - Next -