238 lines
9.0 KiB
Plaintext
238 lines
9.0 KiB
Plaintext
XIGRABBUTTON(libmansuffix)
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==========================
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NAME
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----
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XIGrabButton, XIUngrabButton, XIGrabKeycode, XIUngrabKeycode, XIGrabTouchBegin, XIUngrabTouchBegin - grab/ungrab buttons or keys
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SYNOPSIS
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--------
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#include <X11/extensions/XInput2.h>
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int XIGrabButton( Display *display,
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int deviceid,
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int button,
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Window grab_window,
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Cursor cursor,
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int grab_mode,
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int paired_device_mode,
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Bool owner_events,
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XIEventMask *mask,
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int num_modifiers,
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XIGrabModifiers *modifiers_inout);
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int XIUngrabButton( Display *display,
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int deviceid,
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int button,
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Window grab_window,
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int num_modifiers,
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XIGrabModifiers *modifiers);
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int XIGrabKeycode( Display *display,
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int deviceid,
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int keycode,
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Window grab_window,
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int grab_mode,
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int paired_device_mode,
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Bool owner_events,
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XIEventMask *mask,
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int num_modifiers,
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XIGrabModifiers *modifiers_inout);
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int XIUngrabKeycode( Display *display,
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int deviceid,
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int keycode,
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Window grab_window,
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int num_modifiers,
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XIGrabModifiers *modifiers);
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int XIGrabTouchBegin( Display *display,
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int deviceid,
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Window grab_window,
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Bool owner_events,
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XIEventMask *mask,
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int num_modifiers,
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XIGrabModifiers *modifiers_inout);
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int XIUngrabTouchBegin( Display *display,
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int deviceid,
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Window grab_window,
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int num_modifiers,
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XIGrabModifiers *modifiers);
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display
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Specifies the connection to the X server.
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device
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Specifies the device that is to be grabbed or released
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button
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Specifies the device button that is to be grabbed or
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released or XIAnyButton.
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keycode
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Specifies the keycode that is to be grabbed or released
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or XIAnyKeycode.
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num_modifiers
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Number of elements in modifiers or modifiers_inout.
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modifiers
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Specifies the set of latched and base modifiers or
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XIAnyModifier to ungrab. The data type is for
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consistency with the respective grab request and the
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status code of the XIGrabModifiers struct is ignored.
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modifiers_inout
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Specifies the set of latched and base modifiers or
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XIAnyModifier to grab. Returns the modifiers that could
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not be grabbed and their error code.
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grab_window
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Specifies the grab window.
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owner_events
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Specifies a Boolean value that indicates whether the are
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to be reported as usual or reported with respect to the
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grab window.
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mask
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Specifies the event mask.
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grab_mode
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Specifies further processing of events from this device.
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You can pass XIGrabModeSync or XIGrabModeAsync.
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paired_device_mode
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Specifies further processing of events from the paired
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master device. You can pass XIGrabModeSync or
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XIGrabModeAsync. If deviceid specifies a floating slave
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device, this parameter is ignored.
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DESCRIPTION
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-----------
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XIGrabButton, XIGrabKeycode and XIGrabTouchBegin establish a passive
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grab. The modifier device for a button grab is the paired master device
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if deviceid specifies a master pointer. Otherwise, the modifier
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device is the device specified with deviceid. In the future,
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the device is actively grabbed (as for XIGrabDevice, the
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last-grab time is set to the time at which the button or keycode
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was pressed and the XI_ButtonPress or XI_KeyPress event is
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reported if all of the following conditions are true:
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* The device is not grabbed, and the specified button or
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keycode is logically pressed or a touch event occurs when the
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specified modifier keys are logically down on the modifier device
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and no other buttons or modifier keys are logically down.
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* Either the grab window is an ancestor of (or is) the focus
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window, OR the grab window is a descendent of the focus
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window and contains the device.
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* A passive grab on the same button/modifier combination does
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not exist on any ancestor of grab_window.
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The interpretation of the remaining arguments is as for
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XIGrabDevice. The active grab is terminated automatically when
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the logical state of the device has all buttons or keys
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released (independent of the logical state of the modifier
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keys).
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If the device is an attached slave device, the device is
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automatically detached from the master device when the grab
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activates and reattached to the same master device when the
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grab deactivates. If the master device is removed while the
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device is floating as a result of a grab, the device remains
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floating once the grab deactivates.
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Note that the logical state of a device (as seen by client
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applications) may lag the physical state if device event
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processing is frozen.
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This request overrides all previous grabs by the same client on
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the same button/modifier or keycode/modifier combinations on the
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same window. A modifiers of XIAnyModifier is equivalent to
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issuing the grab request for all possible modifier combinations
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(including the combination of no modifiers). It is not required
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that all modifiers specified have currently assigned KeyCodes.
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A button of XIAnyButton is equivalent to issuing the request
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for all possible buttons. Otherwise, it is not required that
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the specified button currently be assigned to a physical
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button.
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If some other client has already issued a XIGrabButton or
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XIGrabKeycode with the same button/modifier or keycode/modifier
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combination on the same window, a BadAccess error results. When
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using XIAnyModifier or XIAnyButton , the request fails
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completely, and a XIBadAccess error results (no grabs are
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established) if there is a conflicting grab for any
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combination. XIGrabButton and XIGrabKeycode have no effect on an
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active grab.
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On success, XIGrabButton, XIGrabKeycode and XIGrabTouchBegin return 0;
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If one or more modifier combinations could not be grabbed,
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XIGrabButton, XIGrabKeycode and XIGrabTouchBegin return the number of
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failed combinations and modifiers_inout contains the failed combinations
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and their respective error codes.
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XIGrabButton, XIGrabKeycode and XIGrabTouchBegin can generate BadClass,
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BadDevice, BadMatch, BadValue, and BadWindow errors.
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XIUngrabButton, XIUngrabKeycode and XIUngrabTouchBegin release the
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passive grab for a button/modifier, keycode/modifier or touch/modifier
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combination on the specified window if it was grabbed by this client. A
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modifier of XIAnyModifier is equivalent to issuing the ungrab request
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for all possible modifier combinations, including the
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combination of no modifiers. A button of XIAnyButton is
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equivalent to issuing the request for all possible buttons.
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XIUngrabButton and XIUngrabKeycode have no effect on an active
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grab.
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XIUngrabButton, XIUngrabKeycode and XIUngrabTouchBegin can generate
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BadDevice, BadMatch, BadValue and BadWindow errors.
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RETURN VALUE
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------------
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XIGrabButton, XIGrabKeycode and XIGrabTouchBegin return the number of
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modifier combination that could not establish a passive grab. The
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modifiers are returned in modifiers_inout, along with the respective
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error for this modifier combination. If XIGrabButton, XIGrabKeycode
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or XIGrabTouchBegin return zero, passive grabs with all requested
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modifier combinations were established successfully.
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DIAGNOSTICS
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-----------
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BadDevice
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An invalid deviceid was specified.
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BadMatch
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This error may occur if XIGrabButton specified a device
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that has no buttons, or XIGrabKeycode specified a device
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that has no keys, or XIGrabTouchBegin specified a device
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that is not touch-capable.
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BadValue
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Some numeric value falls outside the range of values
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accepted by the request. Unless a specific range is
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specified for an argument, the full range defined by the
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argument's type is accepted. Any argument defined as a
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set of alternatives can generate this error.
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BadWindow
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A value for a Window argument does not name a defined
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Window.
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BUGS
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----
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The protocol headers for XI 2.0 did not provide
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XIGrabModeAsync or XIGrabModeSync. Use GrabModeSync and
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GrabModeAsync instead, respectively.
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SEE ALSO
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--------
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XIAllowEvents(libmansuffix)
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