move.c

最简单的窗口管理器

#ifndef lint
static char *rcsid_Move_c = "$Header: Move.c  88/08/09 08:57:55 Xusr Exp $";
#endif

/*
 * Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
 *
 *                         All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and that
 * both that copyright notice and this permission notice appear in
 * supporting documentation, and that the name of Digital Equipment
 * Corporation not be used in advertising or publicity pertaining to
 * distribution of the software without specific, written prior permission.
 *
 *
 * DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
 * DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
 * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

/*
 * MODIFICATION HISTORY
 *
 * 000 -- M. Gancarz, DEC Ultrix Engineering Group
 * 001 -- Loretta Guarino Reid, DEC Ultrix Engineering Group, 
 *	  Western Software Lab. Port to X11
 */

#ifndef lint
static char *sccsid = "@(#)Move.c	3.8	1/24/86";
#endif

#include "uwm.h"

Bool Move(window, mask, button, x, y)
Window window;				/* Event window. */
int mask;				/* Button/key mask. */
int button;				/* Button event detail. */
int x, y;				/* Event mouse position. */
{
    register int prev_x;		/* Previous event window X location. */
    register int prev_y;		/* Previous event window Y location. */
    XWindowAttributes window_info;	/* Event window information. */
    int cur_x;				/* Current event window X location. */
    int cur_y;				/* Current event window Y location. */
    int root_x;				/* Root window X location. */
    int root_y;				/* Root window Y location. */
    int ulx, uly;			/* Event window upper left X and Y. */
    int lrx, lry;			/* Event window lower right X and Y. */
    int init_ulx, init_uly;		/* Init window upper left X and Y. */
    int init_lrx, init_lry;		/* Init window lower right X and Y. */
    int num_vectors;			/* Number of vectors in box. */
    unsigned int ptrmask;			/* state of ptr when queried */
    Window sub_window;			/* Query mouse event sub-window. */
    Window root;			/* Query mouse event root. */
    XEvent button_event;		/* Button event packet. */
    XSegment box[MAX_BOX_VECTORS];	/* Box vertex buffer. */
    XSegment zap[MAX_ZAP_VECTORS];	/* Zap effect verted buffer. */

    /*
     * Do not try to move the root window.
     */
    if (window == RootWindow(dpy, scr))
        return(FALSE);

    /*
     * Change the cursor.
     */
    XChangeActivePointerGrab(dpy, EVENTMASK, ArrowCrossCursor, CurrentTime);

    /*
     * Clear the vector buffers.
     */
    memset(box, 0, sizeof(box));
    if (Zap) memset(zap, 0, sizeof(zap));
    
    /*
     * Gather info on the event window.
     */
    status = XGetWindowAttributes(dpy, window, &window_info);
    if (status == FAILURE) return(FALSE);

    /*
     * Initialize movement variables.
     */
    init_ulx = ulx = window_info.x;
    init_uly = uly = window_info.y;
    init_lrx = lrx = window_info.x + window_info.width +
                     (window_info.border_width << 1) - 1;
    init_lry = lry = window_info.y + window_info.height +
                     (window_info.border_width << 1) - 1;

    /*
     * Store the box.
     */
    if (Grid)
        num_vectors = StoreGridBox(box, ulx, uly, lrx, lry);
    else num_vectors = StoreBox(box, ulx, uly, lrx, lry);

    /*
     * Initialize the previous location variables.
     */
    prev_x = x;
    prev_y = y;

    /*
     * Freeze the server, if requested by the user.
     * This results in a solid box instead of a flickering one.
     */
    if (Freeze) XGrabServer(dpy);

    /*
     * Process any pending exposure events before drawing the box.
     */
    while (QLength(dpy) > 0) {
        XPeekEvent(dpy, &button_event);
        if (((XAnyEvent *)&button_event)->window == RootWindow(dpy, scr))
            break;
        GetButton(&button_event);
    }

    /*
     * Now draw the box.
     */
    DrawBox();
    Frozen = window;

    /*
     * Main loop.
     */
    while (TRUE) {

    	/*
	 * Check to see if we have a change in mouse button status.
	 * This is how we get out of this "while" loop.
	 */
	if (XPending(dpy) && !ProcessRequests(box, num_vectors) && GetButton(&button_event)) {
	    /*
	     * Process the pending events, this sequence is the only
	     * way out of the loop and the routine.
	     */

            if ((button_event.type != ButtonPress) && 
	        (button_event.type != ButtonRelease)) {
                continue; /* spurious menu event... */
            }

            /*
             * If we froze the server, then erase the last lines drawn.
             */
            if (Freeze) {
                DrawBox();
                Frozen = (Window)0;
                XUngrabServer(dpy);
            }

	    if ((button_event.type == ButtonRelease) &&
		(((XButtonReleasedEvent *)&button_event)->button == button)) {

		/*
		 * The button was released, so move the window.
		 */

		if (Zap) {
                    num_vectors = StoreZap(zap,
                                           init_ulx, init_uly,
                                           init_lrx, init_lry,
                                           ulx, uly,
                                           lrx, lry);
                    DrawZap();
                    DrawZap();
                }
		XMoveWindow(dpy, window, ulx, uly);
		return(TRUE);
	    }
	    else {

		/*
		 * Some other button event occured, this aborts the
		 * current operation.
		 */

		ResetCursor(button);
		return(TRUE);
	    }
	}

        /*
         * Take care of all the little things that have changed.
         */
        XQueryPointer(dpy, 
		      RootWindow(dpy, scr), &root,  &sub_window,
		      &root_x, &root_y, &cur_x, &cur_y, &ptrmask);
        if ((cur_x != prev_x) || (cur_y != prev_y)) {

            /*
             * If we've frozen the server, then erase the old box first!
             */
            if (Freeze)
                DrawBox();

            /*
             * Box position has changed.
             */
            ulx += cur_x - prev_x;
            uly += cur_y - prev_y;
            lrx += cur_x - prev_x;
            lry += cur_y - prev_y;

            /*
             * Box needs to be restored.
             */
            if (Grid)
                num_vectors = StoreGridBox(box, ulx, uly, lrx, lry);
            else num_vectors = StoreBox(box, ulx, uly, lrx, lry);


            /*
             * Draw the new box.
             */
            if (Freeze)
                DrawBox();
    	}

    	/* 
    	 * Save old box position.
    	 */
    	prev_x = cur_x;
    	prev_y = cur_y;

        /*
         * If server is not frozen, then draw the "flicker" box.
         */
        if (!Freeze) {
            DrawBox();
            DrawBox();
        }
    }
}