Xlib â C Language X Interface

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<strong>Xlib</strong> − C LibraryX11, Release 6.7 DRAFTButton5Mask, ShiftMask, LockMask, ControlMask, Mod1Mask, Mod2Mask,Mod3Mask, Mod4Mask, Mod5Mask.The mode member is set to indicate whether the events are normal events, pseudo-motion eventswhen a grab activates, or pseudo-motion events when a grab deactivates. The Xserver can setthis member to NotifyNormal, NotifyGrab, or NotifyUngrab.The detail member is set to indicate the notify detail and can be NotifyAncestor, NotifyVirtual,NotifyInferior, NotifyNonlinear, or NotifyNonlinearVirtual.10.6.1. Normal Entry/Exit EventsEnterNotify and LeaveNotify events are generated when the pointer moves from one window toanother window. Normal events are identified by XEnterWindowEvent or XLeaveWindow-Event structures whose mode member is set to NotifyNormal.• When the pointer moves from window Atowindow Band A is an inferior of B, the Xserver does the following:−−−Itgenerates a LeaveNotify event on window A,with the detail member of theXLeaveWindowEvent structure set to NotifyAncestor.Itgenerates a LeaveNotify event on each window between window Aand windowB, exclusive, with the detail member of each XLeaveWindowEvent structure set toNotifyVirtual.Itgenerates an EnterNotify event on window B,with the detail member of the XEnterWindowEventstructure set to NotifyInferior.• When the pointer moves from window Atowindow Band B is an inferior of A, the Xserver does the following:−−−Itgenerates a LeaveNotify event on window A,with the detail member of theXLeaveWindowEvent structure set to NotifyInferior.Itgenerates an EnterNotify event on each window between window Aand windowB, exclusive, with the detail member of each XEnterWindowEvent structure set toNotifyVirtual.Itgenerates an EnterNotify event on window B,with the detail member of the XEnterWindowEventstructure set to NotifyAncestor.• When the pointer moves from window Atowindow Band window Cistheir least commonancestor, the X server does the following:−−−−Itgenerates a LeaveNotify event on window A,with the detail member of theXLeaveWindowEvent structure set to NotifyNonlinear.Itgenerates a LeaveNotify event on each window between window Aand windowC, exclusive, with the detail member of each XLeaveWindowEvent structure set toNotifyNonlinearVirtual.Itgenerates an EnterNotify event on each window between window Cand windowB, exclusive, with the detail member of each XEnterWindowEvent structure set toNotifyNonlinearVirtual.Itgenerates an EnterNotify event on window B,with the detail member of the XEnterWindowEventstructure set to NotifyNonlinear.• When the pointer moves from window Atowindow Bondifferent screens, the X serverdoes the following:209
<strong>Xlib</strong> − C LibraryX11, Release 6.7 DRAFT−−−−Itgenerates a LeaveNotify event on window A,with the detail member of theXLeaveWindowEvent structure set to NotifyNonlinear.Ifwindow Aisnot a root window, itgenerates a LeaveNotify event on each windowabove window Auptoand including its root, with the detail member of eachXLeaveWindowEvent structure set to NotifyNonlinearVirtual.Ifwindow Bisnot a root window, itgenerates an EnterNotify event on each windowfrom window B’s root down to but not including window B,with the detailmember of each XEnterWindowEvent structure set to NotifyNonlinearVirtual.Itgenerates an EnterNotify event on window B,with the detail member of the XEnterWindowEventstructure set to NotifyNonlinear.10.6.2. Grab and Ungrab Entry/Exit EventsPseudo-motion mode EnterNotify and LeaveNotify events are generated when a pointer grabactivates or deactivates. Events in which the pointer grab activates are identified by XEnterWindowEventor XLeaveWindowEvent structures whose mode member is set to NotifyGrab.Events in which the pointer grab deactivates are identified by XEnterWindowEvent orXLeaveWindowEvent structures whose mode member is set to NotifyUngrab (see XGrab-Pointer).• When a pointer grab activates after any initial warp into a confine_to window and beforegenerating any actual ButtonPress event that activates the grab, G is the grab_window forthe grab, and P is the window the pointer is in, the X server does the following:−Itgenerates EnterNotify and LeaveNotify events (see section 10.6.1) with the modemembers of the XEnterWindowEvent and XLeaveWindowEvent structures set toNotifyGrab. These events are generated as if the pointer were to suddenly warpfrom its current position in P to some position in G. However, the pointer does notwarp, and the X server uses the pointer position as both the initial and final positionsfor the events.• When a pointer grab deactivates after generating any actual ButtonRelease event thatdeactivates the grab, G is the grab_window for the grab, and P is the window the pointer isin, the X server does the following:−Itgenerates EnterNotify and LeaveNotify events (see section 10.6.1) with the modemembers of the XEnterWindowEvent and XLeaveWindowEvent structures set toNotifyUngrab. These events are generated as if the pointer were to suddenly warpfrom some position in G to its current position in P. However, the pointer does notwarp, and the X server uses the current pointer position as both the initial and finalpositions for the events.10.7. Input Focus EventsThis section describes the processing that occurs for the input focus events FocusIn and FocusOut.The X server can report FocusIn or FocusOut events to clients wanting informationabout when the input focus changes. The keyboard is always attached to some window (typically,the root window oratop-level window), which is called the focus window. The focus windowand the position of the pointer determine the window that receives keyboard input. Clients mayneed to know when the input focus changes to control highlighting of areas on the screen.To receive FocusIn or FocusOut events, set the FocusChangeMask bit in the event-maskattribute of the window.210
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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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