X11 Libraries (X11 package)Source codeContentsIndex
Graphics.X11.Xlib
Portabilityportable
Stabilityprovisional
Maintainerlibraries@haskell.org
Contents
Conventions
Types
X11 library functions
Description

A collection of FFI declarations for interfacing with Xlib.

The library aims to provide a direct translation of the X binding into Haskell so the most important documentation you should read is The Xlib Programming Manual, available online at http://tronche.com/gui/x/xlib/. Let me say that again because it is very important. Get hold of this documentation and read it: it tells you almost everything you need to know to use this library.

Synopsis
module Graphics.X11.Types
data Display
data Screen
data Visual
data GC
data SetWindowAttributes
data Point = Point {
pt_x :: Position
pt_y :: Position
}
data Rectangle = Rectangle {
rect_x :: Position
rect_y :: Position
rect_width :: Dimension
rect_height :: Dimension
}
data Arc = Arc {
arc_x :: Position
arc_y :: Position
arc_width :: Dimension
arc_height :: Dimension
arc_angle1 :: Angle
arc_angle2 :: Angle
}
data Segment = Segment {
seg_x1 :: Position
seg_y1 :: Position
seg_x2 :: Position
seg_y2 :: Position
}
data Color = Color {
color_pixel :: Pixel
color_red :: Word16
color_green :: Word16
color_blue :: Word16
color_flags :: Word8
}
type Pixel = Word32
type Position = Int32
type Dimension = Word32
type Angle = Int
type ScreenNumber = Word32
type Buffer = Int
module Graphics.X11.Xlib.Event
module Graphics.X11.Xlib.Display
module Graphics.X11.Xlib.Screen
module Graphics.X11.Xlib.Window
module Graphics.X11.Xlib.Context
module Graphics.X11.Xlib.Color
module Graphics.X11.Xlib.Font
module Graphics.X11.Xlib.Atom
module Graphics.X11.Xlib.Region
module Graphics.X11.Xlib.Misc
Conventions

In translating the library, we had to change names to conform with Haskell's lexical syntax: function names and names of constants must start with a lowercase letter; type names must start with an uppercase letter. The case of the remaining letters is unchanged.

In addition, we chose to take advantage of Haskell's module system to allow us to drop common prefixes (X, XA_, etc.) attached to X11 identifiers.

We named enumeration types so that function types would be easier to understand. For example, we added Status, WindowClass, etc. Note that the types are synonyms for Int so no extra typesafety was obtained.

We consistently raise exceptions when a function returns an error code. In practice, this only affects the following functions because most Xlib functions do not return error codes: allocColor, allocNamedColor, fetchBuffer, fetchBytes, fontFromGC, getGeometry, getIconName, iconifyWindow, loadQueryFont, lookupColor, openDisplay, parseColor, queryBestCursor, queryBestSize, queryBestStipple, queryBestTile, rotateBuffers, selectInput, storeBuffer, storeBytes, withdrawWindow.

Types
module Graphics.X11.Types
data Display
pointer to an X11 Display structure
show/hide Instances
data Screen
pointer to an X11 Screen structure
show/hide Instances
data Visual
pointer to an X11 Visual structure
show/hide Instances
data GC
pointer to an X11 GC structure
show/hide Instances
data SetWindowAttributes
pointer to an X11 XSetWindowAttributes structure
show/hide Instances
data Point
counterpart of an X11 XPoint structure
Constructors
Point
pt_x :: Position
pt_y :: Position
show/hide Instances
data Rectangle
counterpart of an X11 XRectangle structure
Constructors
Rectangle
rect_x :: Position
rect_y :: Position
rect_width :: Dimension
rect_height :: Dimension
show/hide Instances
data Arc
counterpart of an X11 XArc structure
Constructors
Arc
arc_x :: Position
arc_y :: Position
arc_width :: Dimension
arc_height :: Dimension
arc_angle1 :: Angle
arc_angle2 :: Angle
show/hide Instances
data Segment
counterpart of an X11 XSegment structure
Constructors
Segment
seg_x1 :: Position
seg_y1 :: Position
seg_x2 :: Position
seg_y2 :: Position
show/hide Instances
data Color
counterpart of an X11 XColor structure
Constructors
Color
color_pixel :: Pixel
color_red :: Word16
color_green :: Word16
color_blue :: Word16
color_flags :: Word8
show/hide Instances
type Pixel = Word32
type Position = Int32
type Dimension = Word32
type Angle = Int
type ScreenNumber = Word32
type Buffer = Int
X11 library functions
module Graphics.X11.Xlib.Event
module Graphics.X11.Xlib.Display
module Graphics.X11.Xlib.Screen
module Graphics.X11.Xlib.Window
module Graphics.X11.Xlib.Context
module Graphics.X11.Xlib.Color
module Graphics.X11.Xlib.Font
module Graphics.X11.Xlib.Atom
module Graphics.X11.Xlib.Region
module Graphics.X11.Xlib.Misc
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