Return to ch12c.t CVS log

Up to [CSRG BSD Unix] / 43BSD / contrib / X / doc / Xlib

Annotation of 43BSD/contrib/X/doc/Xlib/ch12c.t, revision 1.1

1.1     ! root        1: .NH 2
        !             2: Mouse, Button and Server Grabbing
        !             3: .PP
        !             4: Some programs need to  gain exclusive access to the mouse,
        !             5: a single mouse button under some circumstances,
        !             6: or the entire X server for the duration of some operation.
        !             7: .FD
        !             8: .IN "Definitions" "XGrabMouse"
        !             9: .IN "XGrabMouse"
        !            10: .IN "Mouse" "Grabbing"
        !            11: Status XGrabMouse (w, cursor, mask)
        !            12:        Window w;
        !            13:        Cursor cursor;
        !            14:        int mask;       /* event mask */
        !            15: .FN
        !            16: After \fIXGrabMouse\fP is called, all future mouse events will only go to
        !            17: .IN "XSelectInput"
        !            18: windows for which the client has previously called \fIXSelectInput\fP.  The
        !            19: \fIButtonPressed\fP, \fIButtonReleased\fP, \fIEnterWindow\fP,
        !            20: \fILeaveWindow\fP, \fIMouseMoved\fP,
        !            21: \fILeftDownMotion\fP, \fIMiddleDownMotion\fP,
        !            22: and \fIRightDownMotion\fP bits of the \fImask\fP
        !            23: parameter temporarily override the corresponding bits in any mask
        !            24: previously passed to \fIXSelectInput\fP; other bits in \fImask\fP are ignored.
        !            25: .PP
        !            26: .IN "XSelectInput"
        !            27: If one of the above-mentioned events occurs, and the client has not
        !            28: called \fIXSelectInput\fP on the window where the event would normally be
        !            29: sent, then the event will be sent to the window \fIw\fP, provided that the
        !            30: event is specified in 
        !            31: \fImask\fP and is not \fIEnterWindow\fP or \fILeaveWindow\fP.
        !            32: .PP
        !            33: .IN "Grabbing Error"
        !            34: An error will occur if a different client has already grabbed the mouse
        !            35: and has not ungrabbed it.  It is not an error for the same client to
        !            36: grab the mouse more than once without ungrabbing it in between.  A
        !            37: mouse-grabbing client may want to do this in order to change the cursor
        !            38: or event mask without ungrabbing the mouse.
        !            39: .PP
        !            40: Grabbing the mouse overrides any \fIXGrabButton\fP calls previously issued by
        !            41: this or any other client, until the mouse is ungrabbed.
        !            42: .PP
        !            43: Note that this procedure returns a status and is therefore synchronous,
        !            44: even though no other values are returned.
        !            45: It returns 0 if the mouse could not be grabbed, non-zero if the
        !            46: mouse was successfully grabbed.
        !            47: .FD
        !            48: .IN "Definitions" "XGrabMouse"
        !            49: .IN "XGrabMouse"
        !            50: XUngrabMouse ()
        !            51: .FN
        !            52: \fIXUngrabMouse\fP releases hold of the mouse if it was grabbed by 
        !            53: \fIXGrabMouse\fP.
        !            54: .FD
        !            55: .IN "Definitions" "XGrabButton"
        !            56: .IN "XGrabButton"
        !            57: Status XGrabButton (w, cursor, buttonMask, eventMask)
        !            58:        Window w;
        !            59:        Cursor cursor;
        !            60:        int buttonMask;
        !            61:        int eventMask;
        !            62: .FN
        !            63: After \fIXGrabButton\fP has been called, the mouse will automatically be
        !            64: grabbed whenever a particular mouse button is pressed while certain keys are
        !            65: down.
        !            66: .IN "Button Mask"
        !            67: The combination is specified in \fIbuttonMask\fP;  this mask must
        !            68: have exactly one of the \fILeftMask\fP, \fIMiddleMask\fP, and \fIRightMask\fP
        !            69: bits set,
        !            70: and may have some combination of the \fIControlMask\fP, \fIMetaMask\fP,
        !            71: \fIShiftLockMask\fP and
        !            72: \fIShiftMask\fP bits set as well.
        !            73: .PP
        !            74: If the specified button is pressed while exactly the specified keys are down,
        !            75: this and all future mouse events are grabbed until all buttons are
        !            76: .IN "XGrabMouse"
        !            77: released, with events sent to windows as described under \fIXGrabMouse\fP
        !            78: above.
        !            79: .IN "Event Mask"
        !            80: The \fIeventMask\fP determines what mouse events are reported while the
        !            81: mouse is grabbed.
        !            82: .PP
        !            83: An error will occur if another client has already grabbed the same
        !            84: button/key combination and has not ungrabbed it.
        !            85: .PP
        !            86: Note that this procedure returns a status and is therefore synchronous,
        !            87: It returns 0 if the button could not be grabbed, non-zero if the
        !            88: the button was grabbed successfully.
        !            89: .FD
        !            90: .IN "Definitions" "XUngrabButton"
        !            91: .IN "XGrabButton"
        !            92: XUngrabButton (mask)
        !            93:        int mask;       /* button mask;  see XGrabButton */
        !            94: .FN
        !            95: \fIXUngrabButton\fP notifies the server that the client is no longer
        !            96: interested in grabbing the mouse when the specified button/key
        !            97: combination occurs.
        !            98: See \fIXGrabButton\fP for the meaning of the button
        !            99: mask bits.
        !           100: This grab is overridden by a grab mouse request.
        !           101: .FD
        !           102: .IN "XGrabServer"
        !           103: .IN "Definitions" "XGrabServer"
        !           104: .IN "Grabbing" "Server"
        !           105: XGrabServer()
        !           106: 
        !           107: XUngrabServer()
        !           108: .FN
        !           109: These requests can be used to control processing of output on other
        !           110: connections by the window system server.
        !           111: No processing of requests or close downs on all other connections
        !           112: will occur while the server is grabbed.
        !           113: .PP
        !           114: .IN "Menus"
        !           115: .IN "Window" "Managers"
        !           116: This may be useful for menus or window manager programs who may want to
        !           117: preserve bits on the screen while temporarily suspending processing
        !           118: on other connections.

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.