Name
Expose — xexpose
When Generated
An Expose
event is generated when a window
becomes visible or a previously invisible part of a window becomes
visible. Only InputOutput
windows generate or
need to respond to Expose
events;
InputOnly
windows never generate or need to
respond to them. The Expose
event provides the
position and size of the exposed area within the window and a rough
count of the number of remaining exposure events for the current
window.
Select With
This event is selected with
ExposureMask
.
XEvent Structure Name
typedef union _XEvent { ... XExposeEvent xexpose; ... } XEvent;
Event Structure
typedef struct { int type; unsigned long serial; /* # of last request processed by server */ Bool send_event; /* True if this came from SendEvent request */ Display *display; /* Display the event was read from */ Window window; int x, y; int width, height; int count; /* If nonzero, at least this many more */ } XExposeEvent;
Event Structure Members
x
,y
The coordinates of the upper-left corner of the exposed region relative to the origin of the window.
width
,height
The width and height in pixels of the exposed region.
count
The approximate number of remaining contiguous
Expose
events that were generated as a result of a single function call.
Notes
A single action such as a window movement or a function call can generate several exposure events on one window or on several windows. The server guarantees that all exposure events generated from a single action will be sent contiguously, so that they ...
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