X Window System core protocol: Difference between revisions

Revision as of 15:58, 11 May 2020

Revision as of 12:02, 27 June 2020

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A client can request the server to send an event to another client; this is used for communication between clients. Such an event is for example generated when a client requests the text that is currently selected: this event is sent to the client that is currently handling the window that holds the selection.

The <code>Expose</code> event is sent when an area of a window of destroyed and content is made visible. The content of a window may be destroyed in some conditions, for example, if the window is covered and the server is not maintaining a backing store. The server generates an <code>Expose</code> event to notify the client that a part of the window has to be drawn.

[[Image:Xevents.svg|thumb|450px|An example of event: when a key is pressed in a window, an event is generated and sent to a client depending on its window event mask, which the client can change.]]