Michael Conrad
and 1 contributors

NAME

X11::Xlib::XEvent - Polymorphic class for XEvent structures

DESCRiPTION

This object wraps an XEvent. XEvent is a union of many different C structs, though they all share a few common fields. The storage space of an XEvent is constant regardless of type, and so this class is backed by a simple scalar ref.

The active struct of the union is determined by the "type" field. This object heirarchy attempts to help you make correct usage of the union with respect to the current type, so as you change the value of type the object will automatically re-bless itself into the appropriate subclass, giving you access to new struct fields.

Most of the "magic" occurs from Perl code, not XS, so it is possible to define new event types if this module lacks any in your local copy of Xlib. You can also access the "bytes" directly any time you want. And, you don't even have to use this object at all; any scalar or scalarref of the correct length can be passed to the X11::Xlib methods that expect an XEvent pointer.

METHODS

new

  my $xevent= X11::Xlib::XEvent->new();
  my $xevent= X11::Xlib::XEvent->new( %fields );
  my $xevent= X11::Xlib::XEvent->new( \%fields );

You can construct XEvent as an empty buffer, or initialize it with a hash or hashref of fields. Initialization is performed via "pack". Un-set fields are initialized to zero, and the "bytes" is always padded to the length of an XEvent.

bytes

Direct access to the bytes of the XEvent.

apply

  $xevent->apply( %fields );

Alias for pack( \%fields, 1, 1 )

pack

  $xevent->pack( \%fields, $consume, $warn );

Assign a set of fields to the packed struct, optionally removing them from the hashref ($consume) and warning about un-known names ($warn). If you supply a new value for "type", the XEvent will get re-blessed to the appropriate type and all union-specific fields will be zeroed before applying the rest of the supplied fields.

unpack

  my $field_hashref= $xevent->unpack;

Unpack the fields of an XEvent into a hashref. The Display field gets inflated to an X11::Xlib object.

summarize

Return a human-readable string describing the Event. The format is intended to be readable by humans, and is subject to change.

COMMON ATTRIBUTES

All XEvent subclasses have the following attributes:

type

This is the key attribute that determines all the rest. Setting this value will re-bless the object to the relevant sub-class. If the type is unknown, it becomes X11::Xlib::XEvent.

display

The handle to the X11 connection that this message came from.

serial

The X11 serial number

send_event

Boolean indicating whether the event was sent with XSendEvent

SUBCLASS ATTRIBUTES

For detailed information about these structures, consult the official documentation

XButtonEvent

Used for event type: ButtonPress, ButtonRelease

  button            - unsigned int
  root              - Window
  same_screen       - Bool
  state             - unsigned int
  subwindow         - Window
  time              - Time
  window            - Window
  x                 - int
  x_root            - int
  y                 - int
  y_root            - int

XCirculateEvent

Used for event type: CirculateNotify

  event             - Window
  place             - int
  window            - Window

XCirculateRequestEvent

Used for event type: CirculateRequest

  parent            - Window
  place             - int
  window            - Window

XClientMessageEvent

Used for event type: ClientMessage

  b                 - char [ 20 ]
  l                 - long [ 5 ]
  s                 - short [ 10 ]
  format            - int
  message_type      - Atom
  window            - Window

XColormapEvent

Used for event type: ColormapNotify

  colormap          - Colormap
  new               - Bool
  state             - int
  window            - Window

XConfigureEvent

Used for event type: ConfigureNotify

  above             - Window
  border_width      - int
  event             - Window
  height            - int
  override_redirect - Bool
  width             - int
  window            - Window
  x                 - int
  y                 - int

XConfigureRequestEvent

Used for event type: ConfigureRequest

  above             - Window
  border_width      - int
  detail            - int
  height            - int
  parent            - Window
  value_mask        - unsigned long
  width             - int
  window            - Window
  x                 - int
  y                 - int

XCreateWindowEvent

Used for event type: CreateNotify

  border_width      - int
  height            - int
  override_redirect - Bool
  parent            - Window
  width             - int
  window            - Window
  x                 - int
  y                 - int

XCrossingEvent

Used for event type: EnterNotify, LeaveNotify

  detail            - int
  focus             - Bool
  mode              - int
  root              - Window
  same_screen       - Bool
  state             - unsigned int
  subwindow         - Window
  time              - Time
  window            - Window
  x                 - int
  x_root            - int
  y                 - int
  y_root            - int

XDestroyWindowEvent

Used for event type: DestroyNotify

  event             - Window
  window            - Window

XErrorEvent

Used for event type: 0

  error_code        - unsigned char
  minor_code        - unsigned char
  request_code      - unsigned char
  resourceid        - XID

XExposeEvent

Used for event type: Expose

  count             - int
  height            - int
  width             - int
  window            - Window
  x                 - int
  y                 - int

XFocusChangeEvent

Used for event type: FocusIn, FocusOut

  detail            - int
  mode              - int
  window            - Window

XGenericEvent

Used for event type: GenericEvent

  evtype            - int
  extension         - int

XGraphicsExposeEvent

Used for event type: GraphicsExpose

  count             - int
  drawable          - Drawable
  height            - int
  major_code        - int
  minor_code        - int
  width             - int
  x                 - int
  y                 - int

XGravityEvent

Used for event type: GravityNotify

  event             - Window
  window            - Window
  x                 - int
  y                 - int

XKeyEvent

Used for event type: KeyPress, KeyRelease

  keycode           - unsigned int
  root              - Window
  same_screen       - Bool
  state             - unsigned int
  subwindow         - Window
  time              - Time
  window            - Window
  x                 - int
  x_root            - int
  y                 - int
  y_root            - int

XKeymapEvent

Used for event type: KeymapNotify

  key_vector        - char [ 32 ]
  window            - Window

XMapEvent

Used for event type: MapNotify

  event             - Window
  override_redirect - Bool
  window            - Window

XMapRequestEvent

Used for event type: MapRequest

  parent            - Window
  window            - Window

XMappingEvent

Used for event type: MappingNotify

  count             - int
  first_keycode     - int
  request           - int
  window            - Window

XMotionEvent

Used for event type: MotionNotify

  is_hint           - char
  root              - Window
  same_screen       - Bool
  state             - unsigned int
  subwindow         - Window
  time              - Time
  window            - Window
  x                 - int
  x_root            - int
  y                 - int
  y_root            - int

XNoExposeEvent

Used for event type: NoExpose

  drawable          - Drawable
  major_code        - int
  minor_code        - int

XPropertyEvent

Used for event type: PropertyNotify

  atom              - Atom
  state             - int
  time              - Time
  window            - Window

XReparentEvent

Used for event type: ReparentNotify

  event             - Window
  override_redirect - Bool
  parent            - Window
  window            - Window
  x                 - int
  y                 - int

XResizeRequestEvent

Used for event type: ResizeRequest

  height            - int
  width             - int
  window            - Window

XSelectionClearEvent

Used for event type: SelectionClear

  selection         - Atom
  time              - Time
  window            - Window

XSelectionEvent

Used for event type: SelectionNotify

  property          - Atom
  requestor         - Window
  selection         - Atom
  target            - Atom
  time              - Time

XSelectionRequestEvent

Used for event type: SelectionRequest

  owner             - Window
  property          - Atom
  requestor         - Window
  selection         - Atom
  target            - Atom
  time              - Time

XUnmapEvent

Used for event type: UnmapNotify

  event             - Window
  from_configure    - Bool
  window            - Window

XVisibilityEvent

Used for event type: VisibilityNotify

  state             - int
  window            - Window

AUTHOR

Olivier Thauvin, <nanardon@nanardon.zarb.org>

Michael Conrad, <mike@nrdvana.net>

COPYRIGHT AND LICENSE

Copyright (C) 2009-2010 by Olivier Thauvin

Copyright (C) 2017 by Michael Conrad

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.10.0 or, at your option, any later version of Perl 5 you may have available.