XLIB Programming Manual, Rel. 5, Third Edition

Name

VisibilityNotify — xvisibility

When Generated

A VisibilityNotify event reports any change in the visibility of the specified window. This event type is never generated on windows whose class is InputOnly. All of the window’s subwindows are ignored when calculating the visibility of the window.

Select With

This event is selected with VisibilityChangeMask.

XEvent Structure Name

typedef union _XEvent {
    ...
    XVisibilityEvent xvisibility;
    ...
} 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 state;               /* VisibilityFullyObscured,
                   VisibilityPartiallyObscured,
                   VisibilityUnobscured */
} XVisibilityEvent;

Event Structure Members

state

A symbol indicating the final visibility status of the window: VisibilityFullyObscured, VisibilityPartiallyObscured, or VisibilityUnobscured.

Notes

Table E-5 lists the transitions that generate VisibilityNotify events and the corresponding state member of the XVisibilityEvent structure.

Table E-5. State Element of the XVisibilityEvent Structure

Visibility Status Before	Visibility Status After	State Member
Partially obscured, fully obscured, or not viewable.	Viewable and completely unobscured.	VisibilityUnobscured
Viewable and completely unobscured, viewable and fully obscured, or not viewable.	Viewable and partially obscured.	VisibilityPartiallyObscured
Viewable and completely ...