RubberBand.c

/* $XConsortium: RubberBand.c,v 1.33 88/10/22 15:19:00 jim Exp $ */
/* derived from XCreateTerm.c */

/*
 * 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.
 */

/* $XConsortium: copyright.h,v 1.5 89/12/22 16:11:28 rws Exp $ */
/*

Copyright 1985, 1986, 1987, 1988, 1989 by the
Massachusetts Institute of Technology

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, 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 M.I.T. not be used in advertising or
publicity pertaining to distribution of the software without specific,
written prior permission.  M.I.T. makes no representations about the
suitability of this software for any purpose.  It is provided "as is"
without express or implied warranty.

*/

/*
 * MODIFICATION HISTORY
 *
 * 000 -- Loretta Guarino Reid, DEC Ultrix Engineering Group
 * 001 -- Ralph R. Swick, DEC/MIT Project Athena
 *	  tailor to uwm; use global resources created by uwm
 */

#include "uwm.h"
#include <X11/cursorfont.h>

#define max(a,b) ( (a) > (b) ? (a) : (b) )
#define min(a,b) ( (a) > (b) ? (b) : (a) )
#define abs(a) ( (a) > 0 ? (a) : -(a))
#define makemult(a, b) ((b==1) ? (a) : (((int)((a) / (b))) * (b)) )

#define LARGEST_DIMENSION 0xffff	/* largest unsigned 16 bit number */

#define DCOUNT 2
#define PCOUNT 1 + (4 * 2 * DCOUNT)

#define BW	PBorderWidth		/* pop-up window border width */
#define IBW	PPadding		/* internal border width for pop-up */

AskUser(dpy, scr, window, x, y, width, height, hints)
	Display *dpy;
	int scr;
	Window window;
	int *x, *y, *width, *height;
	XSizeHints *hints;
	{
	/* XFontStruct *pfont; */
#define pfont	PFontInfo		/* text font for pop-up */
	Cursor ur, ul, ll, lr;          /* cursors for rubber banding    */
	int change_cursor = FALSE;
        int current_cursor;
        char *text;			/* text for prompt string       */
        int nz;                         /* count where zeros are        */
        int popw, poph;                 /* width and height of prompt window*/
        /* int pfore, pback; */         /* prompt foreground and background */
#define pbord	 PBorder
#define pback	 PTextBackground
#define pfore	 PTextForeground
	/* GC popGC, invertGC; */
	/* XGCValues xgc; */
#define popGC	 PopGC
#define invertGC DrawGC
        int x1, y1;                     /* location of mouse            */
        int x2, y2;                     /* other corner of box          */
        int rootx, rooty, mask;         /* for XQueryPointer          */
	Window root, subw;		/* for XQueryPointer */
        int xa = -1, ya = -1, xb = -1, yb = -1;
        int xinc = 1, yinc = 1;
        int minwidth, minheight;
        int maxwidth, maxheight;
        int defwidth, defheight;
        int chosen = -1;
        int stop;
        int changed;
        int dx, dy;
	int delta;
	XPoint box[PCOUNT];
        int hsize, vsize;
        XEvent e;                 /* someplace to put the event   */
        int events;                     /* what events we want.             */
        Window pop;                     /* pop up prompt window         */
	int i;
	char *name;
	Bool free_name;
	int width_offset, height_offset; /* to subtract if resize increments */
	XSetWindowAttributes attr;	/* for setting save unders flag */
	int border_width;		/* width of border around window */
	int two_borders;		/* twice border_width */
	int Rhsize, Rvsize, Rdx, Rdy;	/* real sizes */

	if (hints->flags & USPosition) {
	  *x = hints->x;
	  *y = hints->y;
	  *width = hints->width;
	  *height = hints->height;
          if (hints->flags & PMinSize) {
	      if (*width < hints->min_width) *width = hints->min_width;
	      if (*height < hints->min_height) *height = hints->min_height;
	  }
	  return;
	}

	free_name = False;		/* kludge for broken XFetchNames */
        if (!XFetchName(dpy, window, &name)) {	/* if failure */
	    name = "unnamed window";
	} else if (!name) {			/* if success but no name */
	    name = "";
	} else {				/* if has name */
	    free_name = True;
	}

	ur = XCreateFontCursor(dpy, XC_ur_angle);
	ul = XCreateFontCursor(dpy, XC_ul_angle);
	ll = XCreateFontCursor(dpy, XC_ll_angle);
	lr = XCreateFontCursor(dpy, XC_lr_angle);
	current_cursor = ul;

	events = ButtonPressMask | ButtonReleaseMask;
	/* pfont = XLoadQueryFont(dpy, "fixed"); */

	/* 
	 * go get the mouse as soon as you can 
	 */

	while (1) {
	        int res;
		if ((res = XGrabPointer (dpy, RootWindow(dpy, scr), FALSE, events, 
		  GrabModeAsync, GrabModeAsync, None, ul, CurrentTime )) == 
		    GrabSuccess)
		  break;
		sleep (1);
	}
	nz = strlen(name);		/* compute number of characters */
	text = (char *)malloc (nz + 13);
	(void) strcpy(text, name);
	(void) strcat(text, ": 0000x0000");
	nz += 11;
	popw = XTextWidth (pfont, text, nz) + 2 * IBW;
	poph = pfont->ascent+pfont->descent + 2 * IBW;

	/* pfore = WhitePixel(dpy, scr);
	 * pback = BlackPixel(dpy, scr);
         * xgc.foreground = pfore;
         * xgc.background = pback;
	 * xgc.font = pfont->fid;
	 * popGC = XCreateGC(dpy, RootWindow(dpy, scr),
	 *    GCForeground+GCBackground+GCFont, &xgc);
	 * xgc.function = GXinvert;
	 * xgc.subwindow_mode = IncludeInferiors;
	 * invertGC = XCreateGC(dpy, RootWindow(dpy, scr),
	 *   GCForeground+GCBackground+GCFont+GCFunction+GCSubwindowMode, &xgc);
	 */

	pop = XCreateSimpleWindow(dpy, RootWindow(dpy, scr), 
		0, 0, popw, poph, BW, pbord, pback);
	attr.save_under = True;
	attr.event_mask = (VisibilityChangeMask | ExposureMask);
	XChangeWindowAttributes (dpy, pop, (CWSaveUnder | CWEventMask), &attr);
	XMapWindow (dpy, pop);

	/*
	 * get the current size and border width to use as defaults
	 */
	{
	    Window root;
	    unsigned int dummyint;

	    XGetGeometry (dpy, window, &root, &dummyint, &dummyint,
			  &defwidth, &defheight, &border_width, &dummyint);
	    two_borders = border_width * 2;
	}

	if (hints->flags&PMinSize) {
	  minwidth = hints->min_width;
	  minheight = hints->min_height;
	} else {
	  minwidth = 0;
	  minheight = 0;
	}
	minwidth += two_borders;
	minheight += two_borders;

	if (hints->flags&PMaxSize) {
	  maxwidth = max(hints->max_width+two_borders, minwidth);
	  maxheight = max(hints->max_height+two_borders, minheight);
	} else {
	  maxwidth = LARGEST_DIMENSION;
	  maxheight = LARGEST_DIMENSION;
	}
	if (hints->flags&PResizeInc) {
	  xinc = hints->width_inc;
	  yinc = hints->height_inc;
	}
	if (xinc <= 0) xinc = 1;
	if (yinc <= 0) yinc = 1;

	if (hints->flags&PSize || hints->flags&USSize) {
	  defwidth = hints->width;
	  defheight = hints->height;
	} else if (hints->flags&PMinSize) {
	  defwidth = hints->min_width;
	  defheight = hints->min_height;
	} else if (hints->flags&PMaxSize) {
	  defwidth = hints->max_width;
	  defheight = hints->max_height;
        }
	defwidth += two_borders;
	defheight += two_borders;

      /* until there are better WM_HINTS, we'll assume that the client's
       * minimum width and height are the appropriate offsets to subtract
       * when resizing with an explicit resize increment.
       */
      if (hints->flags&PMinSize && hints->flags&PResizeInc) {
	  width_offset = hints->min_width;
	  height_offset = hints->min_height;
      } else
	  width_offset = height_offset = 0;

	width_offset += two_borders;
	height_offset += two_borders;

	XQueryPointer (dpy, RootWindow(dpy, scr), &root, &subw, 
	  &rootx, &rooty, &x1, &y1, &mask);
	hsize = defwidth;		/* already includes border_width */
	vsize = defheight;		/* already includes border_width */
	x2 = x1+hsize; 
	y2 = y1+vsize;
	stop = FALSE;
	changed = TRUE;

	while (stop == FALSE) {
	    if ( (xb != max (x1, x2)) || (yb != max (y1, y2))
		||(xa != min (x1, x2)) || (ya != min (y1, y2)) ) {
		xa = min (x1, x2);
		ya = min (y1, y2);
		xb = max (x1, x2);
		yb = max (y1, y2);
		for ( i = 0; i < PCOUNT; i += 4) {
                    box[i].x = xa; box[i].y = ya;
                    if (i+1 == PCOUNT) break;
                    box[i+1].x = xb; box[i+1].y = ya;
                    box[i+2].x = xb; box[i+2].y = yb;
                    box[i+3].x = xa; box[i+3].y = yb;
                }
	    }
	    if (XPending (dpy) &&
		XCheckWindowEvent (dpy, pop, ~NoEventMask, &e)) {
		switch (e.type) {
		  case VisibilityNotify:
		    if (((XVisibilityEvent *)&e)->state != 
		        VisibilityUnobscured) 
		      XRaiseWindow (dpy, pop);
		    continue;		/* go to top of while loop */
		  case Expose:
		    changed = TRUE;
		    break;		/* but go to next if statement */
		  default:
		    break;		/* ignore it */
		}
	    }
	    if (changed) {
	        int Hsize = (hsize - width_offset) / xinc;
		int Vsize = (vsize - height_offset) / yinc;
		int pos = 4;
		int n, digits;

		/* text consists of strcat (name, ": 0000x0000"), nz = len */

		changed = FALSE;
		n = digits = 0;
		if (Hsize > 999) {
		    text[nz - 9] = (n = (Hsize / 1000)) + '0';
		    Hsize -= n * 1000; n = 0; digits++;
		} else {
		    text[nz - 9] = ' ';
		}
		if (Hsize > 99 || digits) {
		    text[nz - 8] = (n = (Hsize / 100)) + '0';
		    Hsize -= n * 100; n = 0; digits++;
		} else {
		    text[nz - 8] = ' ';
		}
		if (Hsize > 9 || digits) {
		    text[nz - 7] = (n = (Hsize / 10)) + '0';
		    Hsize -= n * 10; n = 0; digits++;
		} else {
		    text[nz - 7] = ' ';
		}
		text[nz - 6] = Hsize + '0';

		n = digits = 0;
		if (Vsize > 999) {
		    text[nz - pos--] = (n = (Vsize / 1000)) + '0';
		    Vsize -= n * 1000; n = 0; digits++;
		} 
		if (Vsize > 99 || digits) {
		    text[nz - pos--] = (n = (Vsize / 100)) + '0';
		    Vsize -= n * 100; n = 0; digits++;
		} 
		if (Vsize > 9 || digits) {
		    text[nz - pos--] = (n = (Vsize / 10)) + '0';
		    Vsize -= n * 10; n = 0; digits++;
		} 
		text[nz - pos--] = Vsize + '0';

		while (pos > 0) text[nz - pos--] = ' ';

		XDrawImageString(dpy, pop, popGC, IBW, IBW+pfont->ascent,
			text, nz);
	    }
	    XDrawLines (dpy, RootWindow(dpy, scr), invertGC, box, PCOUNT, 
			CoordModeOrigin);
            if (XPending(dpy) &&
		XCheckMaskEvent(dpy, ButtonPressMask|ButtonReleaseMask, &e)) {
                if ((chosen < 0) && (e.type == ButtonPress)) {
			x1 = x2 = ((XButtonEvent *)&e)->x;
                        y1 = y2 = ((XButtonEvent *)&e)->y;
                        chosen = ((XButtonEvent *)&e)->button;
			if (chosen == Button2)
				change_cursor = TRUE;
                }
                else if ((e.type == ButtonRelease) &&
                        ((((XButtonEvent *)&e)->button) == chosen)) {
                	x2 = ((XButtonEvent *)&e)->x;
                	y2 = ((XButtonEvent *)&e)->y;
                        stop = TRUE;
                }
		else
                        XQueryPointer (dpy, RootWindow(dpy, scr), &root, 
			  &subw, &rootx, &rooty, &x2, &y2, &mask);
            }
            else        XQueryPointer (dpy, RootWindow(dpy, scr), &root, 
	    		  &subw, &rootx, &rooty, &x2, &y2, &mask);
	    if (change_cursor) {
                if ((x2 >= x1) && (y2 >= y1) &&
                    current_cursor != lr) {
                    XChangeActivePointerGrab (dpy, events, lr, CurrentTime );
                    current_cursor = lr;
               }
                else if ((x2 >= x1) && (y2 < y1) &&
                         current_cursor != ur) {
                    XChangeActivePointerGrab (dpy, events, ur, CurrentTime );
                    current_cursor = ur;
                }
                else if ((x2 < x1) && (y2 >= y1) &&
                         current_cursor != ll) {
                    XChangeActivePointerGrab (dpy, events, ll, CurrentTime );
                    current_cursor = ll;
                }
                else if ((x2 < x1) && (y2 < y1) &&
                         (current_cursor != ul)) {
                    XChangeActivePointerGrab (dpy, events, ul, CurrentTime );
                    current_cursor = ul;
                }
	    }
	    if (chosen != Button2) {
		x1 = x2;
		y1 = y2;
		if (chosen >= 0) {
			x2 = defwidth;
			if (chosen == Button1)
				y2 = defheight;
			else
				y2 = (DisplayHeight(dpy, scr) - y1);
			x2 = x1 + x2;
			y2 = y1 + y2;
		} else {
		    x2 = x1 + defwidth;
		    y2 = y1 + defheight;
		}
	    }

	    dx = max(min(abs (x2 - x1), maxwidth), minwidth);
	    dx = makemult(dx-minwidth, xinc)+minwidth; 
	    Rdx = dx - two_borders;

	    dy = max(min(abs(y2 - y1), maxheight), minheight);
	    dy = makemult(dy-minheight, yinc)+minheight; 
	    Rdy = dy - two_borders;
	    
	    if (hints->flags & PAspect) {
                if ((Rdx * hints->max_aspect.y > Rdy * hints->max_aspect.x)) {
		   delta = makemult( 
		       (Rdx*hints->max_aspect.y/hints->max_aspect.x) - Rdy, 
		       yinc); 
		   if ((dy+delta) <= maxheight)  dy += delta;
		   else {
		     delta = makemult(
		        Rdx - hints->max_aspect.x * Rdy/hints->max_aspect.y, 
			xinc);
		     if ((dx-delta) >= minwidth) dx -= delta;
		   }
		}
                if (Rdx * hints->min_aspect.y < Rdy * hints->min_aspect.x) {
		   delta = makemult( 
		        (hints->min_aspect.x * Rdy/hints->min_aspect.y) - Rdx,
			xinc);
		   if (dx+delta <= maxwidth) dx += delta;
		   else {
		     delta = makemult(
		       Rdy - (Rdx*hints->min_aspect.y / hints->min_aspect.x), 
		       yinc); 
		     if ((dy-delta) >= minheight) dy -= delta;
		   }
		}
		  
	    }

	    if (dx != hsize) {
	    	hsize = dx;
		changed = TRUE;
	    }
	    if (dy != vsize) {
	    	vsize = dy;
		changed = TRUE;
	    }
	    if (x2 < x1)
		x2 = x1 - dx;
	    else
		x2 = x1 + dx;

	    if (y2 < y1)
		y2 = y1 - dy;
	    else
	    	y2 = y1 + dy;
	}
	XUngrabPointer(dpy, CurrentTime);

	XDestroyWindow (dpy, pop);
	/* XFreeFont(dpy, pfont); */
	XFreeCursor (dpy, ur);
	XFreeCursor (dpy, ul);
	XFreeCursor (dpy, lr);
	XFreeCursor (dpy, ll);
	if (free_name) free(name);
	free(text);
	*x = min(x1, x2);
	*y = min(y1, y2);
	*width = hsize - two_borders;
	*height = vsize - two_borders;
	XSync(dpy, False);
	}