Xlib â C Language X Interface

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<strong>Xlib</strong> − C LibraryX11, Release 6.7 DRAFTXUngrabKeyboard (display, time)Display *display;Time time;displaytimeSpecifies the connection to the X server.Specifies the time. Youcan pass either a timestamp or CurrentTime.The XUngrabKeyboard function releases the keyboard and any queued events if this client hasit actively grabbed from either XGrabKeyboard or XGrabKey. XUngrabKeyboard does notrelease the keyboard and any queued events if the specified time is earlier than the last-keyboardgrabtime or is later than the current X server time. It also generates FocusIn and FocusOutevents. The Xserver automatically performs an UngrabKeyboard request if the event windowfor an active keyboard grab becomes not viewable.To passively grab a single key of the keyboard, use XGrabKey.XGrabKey (display, keycode, modifiers, grab_window, owner_events, pointer_mode,keyboard_mode)Display *display;int keycode;unsigned int modifiers;Window grab_window;Bool owner_events;int pointer_mode, keyboard_mode;displaykeycodemodifiersgrab_windowowner_eventspointer_modekeyboard_modeSpecifies the connection to the X server.Specifies the KeyCode or AnyKey.Specifies the set of keymasks or AnyModifier. The mask is the bitwise inclusiveOR of the valid keymask bits.Specifies the grab window.Specifies a Boolean value that indicates whether the keyboard events are to bereported as usual.Specifies further processing of pointer events. You can pass GrabModeSync orGrabModeAsync.Specifies further processing of keyboard events. You can pass GrabModeSyncor GrabModeAsync.The XGrabKey function establishes a passive grab on the keyboard. In the future, the keyboardis actively grabbed (as for XGrabKeyboard), the last-keyboard-grab time is set to the time atwhich the key was pressed (as transmitted in the KeyPress event), and the KeyPress event isreported if all of the following conditions are true:• The keyboard is not grabbed and the specified key (which can itself be a modifier key) islogically pressed when the specified modifier keys are logically down, and no other modifierkeys are logically down.• Either the grab_window isanancestor of (or is) the focus window, orthe grab_window isadescendant of the focus window and contains the pointer.255
<strong>Xlib</strong> − C LibraryX11, Release 6.7 DRAFT• A passive grab on the same key combination does not exist on any ancestor of grab_window.The interpretation of the remaining arguments is as for XGrabKeyboard. The active grab is terminatedautomatically when the logical state of the keyboard has the specified key released (independentof the logical state of the modifier keys).Note that the logical state of a device (as seen by client applications) may lag the physical state ifdevice event processing is frozen.Amodifiers argument of AnyModifier is equivalent to issuing the request for all possible modifiercombinations (including the combination of no modifiers). It is not required that all modifiersspecified have currently assigned KeyCodes. A keycode argument of AnyKey is equivalent toissuing the request for all possible KeyCodes. Otherwise, the specified keycode must be in therange specified by min_keycode and max_keycode in the connection setup, or a BadValue errorresults.If some other client has issued a XGrabKey with the same key combination on the same window,a BadAccess error results. When using AnyModifier or AnyKey, the request fails completely,and a BadAccess error results (no grabs are established) if there is a conflicting grab forany combination.XGrabKey can generate BadAccess, BadValue, and BadWindow errors.To ungrab a key, use XUngrabKey.XUngrabKey (display, keycode, modifiers, grab_window)Display *display;int keycode;unsigned int modifiers;Window grab_window;displaykeycodemodifiersgrab_windowSpecifies the connection to the X server.Specifies the KeyCode or AnyKey.Specifies the set of keymasks or AnyModifier. The mask is the bitwise inclusiveOR of the valid keymask bits.Specifies the grab window.The XUngrabKey function releases the key combination on the specified window ifitwasgrabbed by this client. It has no effect on an active grab. Amodifiers of AnyModifier is equivalentto issuing the request for all possible modifier combinations (including the combination ofno modifiers). Akeycode argument of AnyKey is equivalent to issuing the request for all possiblekey codes.XUngrabKey can generate BadValue and BadWindow errors.12.3. Resuming Event ProcessingThe previous sections discussed grab mechanisms with which processing of events by the servercan be temporarily suspended. This section describes the mechanism for resuming event processing.To allow further events to be processed when the device has been frozen, use XAllowEvents.256
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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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