Graphics.UI.GLUT.DeviceControl

GLUT-2.5.1.1: A binding for the OpenGL Utility Toolkit

Copyright | (c) Sven Panne 2002-2013
License | BSD3
Maintainer | Sven Panne <svenpanne@gmail.com>
Stability | stable
Portability | portable
Safe Haskell | None
Language | Haskell98

Graphics.UI.GLUT.DeviceControl

Description

GLUT offers some routines for controlling the key repeat and polling the joystick.

Synopsis

- data GlobalKeyRepeat
  - = GlobalKeyRepeatOff
  - | GlobalKeyRepeatOn
  - | GlobalKeyRepeatDefault
- globalKeyRepeat :: StateVar GlobalKeyRepeat
- data PerWindowKeyRepeat
  - = PerWindowKeyRepeatOff
  - | PerWindowKeyRepeatOn
- perWindowKeyRepeat :: StateVar PerWindowKeyRepeat
- forceJoystickCallback :: IO ()

# Documentation

data GlobalKeyRepeat

The state of the global key repeat

Constructors

GlobalKeyRepeatOff |
GlobalKeyRepeatOn |
GlobalKeyRepeatDefault |

Instances

Eq GlobalKeyRepeat |
Ord GlobalKeyRepeat |
Show GlobalKeyRepeat |

globalKeyRepeat :: StateVar GlobalKeyRepeat

Controls the key repeat mode for the window system on a global basis if possible. If supported by the window system, the key repeat can either be disabled, enabled, or set to the window system's default key repeat state.

X Implementation Notes: X11 sends `KeyPress` events repeatedly when the window system's global auto repeat is enabled. `perWindowKeyRepeat` can prevent these auto repeated keystrokes from being reported as keyboard or special callbacks, but there is still some minimal overhead by the X server to continually stream `KeyPress` events to the GLUT application. The `globalKeyRepeat` state variable can be used to actually disable the global sending of auto repeated `KeyPress` events. Note that `globalKeyRepeat` affects the global window system auto repeat state so other applications will not auto repeat if you disable auto repeat globally through `globalKeyRepeat`. GLUT applications using the X11 GLUT implementation should disable key repeat with `globalKeyRepeat` to disable key repeats most efficiently, but are responsible for explicitly restoring the default key repeat state on exit.

Win32 Implementation Notes: The Win32 implementation of `globalKeyRepeat` does nothing. The `perWindowKeyRepeat` can be used in the Win32 GLUT implementation to ignore repeated keys on a per-window basis without changing the global window system key repeat.

data PerWindowKeyRepeat

The state of the per-window key repeat

Constructors

PerWindowKeyRepeatOff |
PerWindowKeyRepeatOn |

Instances

Eq PerWindowKeyRepeat |
Ord PerWindowKeyRepeat |
Show PerWindowKeyRepeat |

perWindowKeyRepeat :: StateVar PerWindowKeyRepeat

Controls if auto repeat keystrokes are reported to the current window. Ignoring auto repeated keystrokes is generally done in conjunction with using the `keyboardMouseCallback`. If you do not ignore auto repeated keystrokes, your GLUT application will experience repeated release/press callbacks. Games using the keyboard will typically want to ignore key repeat.

forceJoystickCallback :: IO ()

Execute the joystick callback set by `joystickCallback` once (if one exists). This is done in a synchronous fashion within the current context, i.e. when `forceJoystickCallback` returns, the callback will have already happened.