Xlib â C Language X Interface

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<strong>Xlib</strong> − C LibraryX11, Release 6.7 DRAFTThe structure for these event types contains:typedef struct {int type; /* FocusIn or FocusOut */unsigned long serial; /* # of last request processed by server */Bool send_event; /* true if this came from a SendEvent request */Display *display; /* Display the event was read from */Window window; /* window ofevent */int mode; /* NotifyNormal, NotifyGrab, NotifyUngrab */int detail;/**NotifyAncestor, NotifyVirtual, NotifyInferior,*NotifyNonlinear,NotifyNonlinearVirtual, NotifyPointer,*NotifyPointerRoot, NotifyDetailNone*/}XFocusChangeEvent;typedef XFocusChangeEvent XFocusInEvent;typedef XFocusChangeEvent XFocusOutEvent;The window member is set to the window onwhich the FocusIn or FocusOut event was generated.This is the window used by the X server to report the event. The mode member is set toindicate whether the focus events are normal focus events, focus events while grabbed, focusevents when a grab activates, or focus events when a grab deactivates. The Xserver can set themode member to NotifyNormal, NotifyWhileGrabbed, NotifyGrab, or NotifyUngrab.All FocusOut events caused by a window unmap are generated after any UnmapNotify event;however, the X protocol does not constrain the ordering of FocusOut events with respect to generatedEnterNotify, LeaveNotify, VisibilityNotify, and Expose events.Depending on the event mode, the detail member is set to indicate the notify detail and can beNotifyAncestor, NotifyVirtual, NotifyInferior, NotifyNonlinear, NotifyNonlinearVirtual,NotifyPointer, NotifyPointerRoot, or NotifyDetailNone.10.7.1. Normal Focus Events and Focus Events While GrabbedNormal focus events are identified by XFocusInEvent or XFocusOutEvent structures whosemode member is set to NotifyNormal. Focus events while grabbed are identified by XFocusIn-Event or XFocusOutEvent structures whose mode member is set to NotifyWhileGrabbed.The X server processes normal focus and focus events while grabbed according to the following:• When the focus moves from window Atowindow B,Aisaninferior of B, and the pointeris in window P,the X server does the following:−Itgenerates a FocusOut event on window A,with the detail member of the XFocusOutEventstructure set to NotifyAncestor.− Itgenerates a FocusOut event on each window between window Aand window B,exclusive, with the detail member of each XFocusOutEvent structure set to NotifyVirtual.−Itgenerates a FocusIn event on window B,with the detail member of the XFocusOutEventstructure set to NotifyInferior.211
<strong>Xlib</strong> − C LibraryX11, Release 6.7 DRAFT−Ifwindow Pisaninferior of window Bbut window Pisnot window Aoraninferioror ancestor of window A,itgenerates a FocusIn event on each window below windowB,down toand including window P,with the detail member of each XFocusIn-Event structure set to NotifyPointer.• When the focus moves from window Atowindow B,Bisaninferior of A, and the pointeris in window P,the X server does the following:−−Ifwindow Pisaninferior of window Abut P is not an inferior of window Boranancestor of B, it generates a FocusOut event on each window from window Puptobut not including window A,with the detail member of each XFocusOutEventstructure set to NotifyPointer.Itgenerates a FocusOut event on window A,with the detail member of the XFocusOutEventstructure set to NotifyInferior.− Itgenerates a FocusIn event on each window between window Aand window B,exclusive, with the detail member of each XFocusInEvent structure set to NotifyVirtual.−Itgenerates a FocusIn event on window B,with the detail member of the XFocusIn-Event structure set to NotifyAncestor.• When the focus moves from window Atowindow B,window Cistheir least commonancestor, and the pointer is in window P,the X server does the following:−−Ifwindow Pisaninferior of window A,itgenerates a FocusOut event on each windowfrom window Puptobut not including window A,with the detail member of theXFocusOutEvent structure set to NotifyPointer.Itgenerates a FocusOut event on window A,with the detail member of the XFocusOutEventstructure set to NotifyNonlinear.− Itgenerates a FocusOut event on each window between window Aand window C,exclusive, with the detail member of each XFocusOutEvent structure set to NotifyNonlinearVirtual.−−−Itgenerates a FocusIn event on each window between C and B, exclusive, with thedetail member of each XFocusInEvent structure set to NotifyNonlinearVirtual.Itgenerates a FocusIn event on window B,with the detail member of the XFocusIn-Event structure set to NotifyNonlinear.Ifwindow Pisaninferior of window B,itgenerates a FocusIn event on each windowbelow window Bdown toand including window P,with the detail member ofthe XFocusInEvent structure set to NotifyPointer.• When the focus moves from window Atowindow Bondifferent screens and the pointer isin window P,the X server does the following:−−−Ifwindow Pisaninferior of window A,itgenerates a FocusOut event on each windowfrom window Puptobut not including window A,with the detail member ofeach XFocusOutEvent structure set to NotifyPointer.Itgenerates a FocusOut event on window A,with the detail member of the XFocusOutEventstructure set to NotifyNonlinear.Ifwindow Aisnot a root window, itgenerates a FocusOut event on each windowabove window Auptoand including its root, with the detail member of each XFocusOutEventstructure set to NotifyNonlinearVirtual.212
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AcknowledgmentsThe design and imple
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Release 6Stephen Gildea (X Consorti
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Xlib − C LibraryX11, Release 6.7
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4.2. Translating Screen Coordinates
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10.7. Input Focus Events . . . . .
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13.5.6.1. Input Style . . . . . . .
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