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Annotation of 43BSDTahoe/new/X/uwm/MoveOpaque.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char *rcsid_MoveOpaque_c = "$Header: MoveOpaque.c,v 10.4 86/11/19 16:24:08 jg Rel $";
        !             3: #endif lint
        !             4: 
        !             5: /*
        !             6:  *                     COPYRIGHT 1985, 1986
        !             7:  *                DIGITAL EQUIPMENT CORPORATION
        !             8:  *                    MAYNARD, MASSACHUSETTS
        !             9:  *                     ALL RIGHTS RESERVED.
        !            10:  *
        !            11:  * THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE AND
        !            12:  * SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT CORPORATION.
        !            13:  * DIGITAL MAKES NO REPRESENTATIONS ABOUT THE SUITIBILITY OF THIS SOFTWARE FOR
        !            14:  * ANY PURPOSE.  IT IS SUPPLIED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY.
        !            15:  *
        !            16:  * IF THE SOFTWARE IS MODIFIED IN A MANNER CREATING DERIVATIVE COPYRIGHT RIGHTS,
        !            17:  * APPROPRIATE LEGENDS MAY BE PLACED ON THE DERIVATIVE WORK IN ADDITION TO THAT
        !            18:  * SET FORTH ABOVE.
        !            19:  *
        !            20:  *
        !            21:  * Permission to use, copy, modify, and distribute this software and its
        !            22:  * documentation for any purpose and without fee is hereby granted, provided
        !            23:  * that the above copyright notice appear in all copies and that both that
        !            24:  * copyright notice and this permission notice appear in supporting documentation,
        !            25:  * and that the name of Digital Equipment Corporation not be used in advertising
        !            26:  * or publicity pertaining to distribution of the software without specific, 
        !            27:  * written prior permission.
        !            28:  *
        !            29:  */
        !            30: 
        !            31: 
        !            32: /*
        !            33:  * MODIFICATION HISTORY
        !            34:  *
        !            35:  * 000 -- M. Gancarz, DEC Ultrix Engineering Group
        !            36:  */
        !            37: 
        !            38: #ifndef lint
        !            39: static char *sccsid = "@(#)MoveOpaque.c        1.7     1/24/86";
        !            40: #endif
        !            41: 
        !            42: #include "uwm.h"
        !            43: 
        !            44: Bool MoveOpaque(window, mask, button, x, y)
        !            45: Window window;                         /* Event window. */
        !            46: int mask;                              /* Button/key mask. */
        !            47: short button;                          /* Button event detail. */
        !            48: int x, y;                              /* Event mouse position. */
        !            49: {
        !            50:     int prev_x, prev_y;                        /* Previous mouse location. */
        !            51:     int cur_x, cur_y;                  /* Current mouse location. */
        !            52:     int win_x, win_y;                  /* Current window location. */
        !            53:     WindowInfo window_info;            /* Event window information. */
        !            54:     Window sub_window;                 /* Query mouse event sub-window. */
        !            55:     XButtonEvent button_event;         /* Button event packet. */
        !            56: 
        !            57:     /*
        !            58:      * Do not try to move the root window.
        !            59:      */
        !            60:     if (window == RootWindow)
        !            61:         return(FALSE);
        !            62: 
        !            63:     /*
        !            64:      * Change the cursor.
        !            65:      */
        !            66:     status = XGrabButton(RootWindow, ArrowCrossCursor, mask, EVENTMASK);
        !            67:     if (status == FAILURE)
        !            68:         Error("MoveOpaque -> Unable to grab button and change cursor.");
        !            69: 
        !            70:     /*
        !            71:      * Gather info on the event window.
        !            72:      */
        !            73:     status = XQueryWindow(window, &window_info);
        !            74:     if (status == FAILURE) return(FALSE);
        !            75: 
        !            76:     /*
        !            77:      * Initialize movement variables.
        !            78:      */
        !            79:     prev_x = cur_x = x;
        !            80:     prev_y = cur_y = y;
        !            81:     win_x = window_info.x;
        !            82:     win_y = window_info.y;
        !            83: 
        !            84:     /*
        !            85:      * Main loop.
        !            86:      */
        !            87:     while (TRUE) {
        !            88: 
        !            89:        /*
        !            90:         * Check to see if we have a change in mouse button status.
        !            91:         * This is how we get out of this "while" loop.
        !            92:         */
        !            93:        if (XPending() && GetButton(&button_event)) {
        !            94: 
        !            95:            /*
        !            96:             * If the button event was something other than the
        !            97:              * release of the original button pressed, then move the
        !            98:              * window back to where it was originally.
        !            99:             */
        !           100:             if ((button_event.type != ButtonReleased) ||
        !           101:                 ((button_event.detail & ValueMask) != button))
        !           102:                 XMoveWindow(window, window_info.x, window_info.y);
        !           103: 
        !           104:             /*
        !           105:              * Reset the cursor and return.
        !           106:              */
        !           107:             Grab(mask);
        !           108:             return(TRUE);
        !           109:        }
        !           110: 
        !           111:         /*
        !           112:          * Take care of all the little things that have changed; 
        !           113:          * i.e., move the window, if necessary.
        !           114:          */
        !           115:         XUpdateMouse(RootWindow, &cur_x, &cur_y, &sub_window);
        !           116:         if ((cur_x != prev_x) || (cur_y != prev_y)) {
        !           117:             win_x += (cur_x - prev_x);
        !           118:             win_y += (cur_y - prev_y);
        !           119:             XMoveWindow(window, win_x, win_y);
        !           120:            prev_x = cur_x;
        !           121:            prev_y = cur_y;
        !           122:        }
        !           123:     }
        !           124: }

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