10.1 Event Types
An event is data generated asynchronously by the X server as a result of some
device activity or as side effects of a request sent by an Xlib function.
Device-related events propagate from the source window to ancestor windows
until some client application has selected that event type
or until the event is explicitly discarded.
The X server generally sends an event to a client application
only if the client has specifically asked to be informed of that event type,
typically by setting the event-mask attribute of the window.
The mask can also be set when you create a window
or by changing the window's
event-mask.
You can also mask out events that would propagate to ancestor windows
by manipulating the
do-not-propagate mask of the window's attributes.
However,
MappingNotify
events are always sent to all clients.
An event type describes a specific event generated by the X server.
For each event type,
a corresponding constant name is defined in
X11/X.h,
which is used when referring to an event type.
The following table lists the event category
and its associated event type or types.
The processing associated with these events is discussed in section "Event Processing Overview".
|
| Event Category | Event Type
| | Keyboard events
|
KeyPress,
KeyRelease
| | Pointer events
|
ButtonPress,
ButtonRelease,
MotionNotify
| | Window crossing events
|
EnterNotify,
LeaveNotify
| | Input focus events
|
FocusIn,
FocusOut
| | Keymap state notification event
|
KeymapNotify
| | Exposure events
|
Expose,
GraphicsExpose,
NoExpose
| | Structure control events
|
CirculateRequest,
ConfigureRequest,
MapRequest,
ResizeRequest
| | Window state notification events
|
CirculateNotify,
ConfigureNotify,
CreateNotify,
DestroyNotify,
GravityNotify,
MapNotify,
MappingNotify,
ReparentNotify,
UnmapNotify,
VisibilityNotify
| | Colormap state notification event
|
ColormapNotify
| | Client communication events
|
ClientMessage,
PropertyNotify,
SelectionClear,
SelectionNotify,
SelectionRequest
|
| |
Christophe Tronche, ch@tronche.com