ngspice/xgraph/xtb.c

/*LINTLIBRARY*/
/*
 * Mini-Toolbox
 *
 * David Harrison
 * University of California, Berkeley
 * 1988, 1989
 *
 * This file contains routines which implement simple display widgets
 * which can be used to construct simple dialog boxes.
 * A mini-toolbox has been written here (overkill but I didn't
 * want to use any of the standards yet -- they are too unstable).
 */

#include <stdio.h>  /* for printf() */
#include <X11/Xos.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <string.h>  /* for strcpy() and strlen() */
#include "xtb.h"

extern void abort();

#define MAXKEYS		10

#ifdef __STDC__
#define FNPTR(fname, rtn, args)	rtn (*fname)args
#include <stdarg.h>
#define VARARGS(func, rtn, args)	rtn func args
#else
#define FNPTR(fname, rtn, args)	rtn (*fname)()
#include <varargs.h>
#define VARARGS(func, rtn, args)	/*VARARGS1*/ rtn func(va_alist) va_dcl
#endif

struct h_info {
    FNPTR(func, xtb_hret, (XEvent * evt, xtb_data info));	/* Function to call */
    xtb_data info;		/* Additional info  */
};

static Display *t_disp;		/* Display          */
static int t_scrn;		/* Screen           */

static unsigned long norm_pix;	/* Foreground color */
static unsigned long back_pix;	/* Background color */

static XFontStruct *norm_font;	/* Normal font      */

extern char *Malloc();

#define STRDUP(str)	(strcpy(Malloc((unsigned) (strlen(str)+1)), (str)))
extern void Free();



void
xtb_init(disp, scrn, foreground, background, font)
Display *disp;			/* Display          */
int     scrn;			/* Screen number    */
unsigned long foreground;	/* Foreground color */
unsigned long background;	/* Background color */
XFontStruct *font;		/* Normal font      */

/*
 * Sets default parameters used by the mini-toolbox.
 */
{
    t_disp = disp;
    t_scrn = scrn;
    norm_pix = foreground;
    back_pix = background;
    norm_font = font;
}


#define gray_width 32
#define gray_height 32
static char gray_bits[] =
{
    0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
    0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa,
    0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
    0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa,
    0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
    0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa,
    0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
    0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa,
    0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
    0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa,
    0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa};

static  Pixmap
make_stipple(disp, able, bits, width, height)
Display *disp;
Drawable able;
char   *bits;
unsigned int     width,
        height;
{
    unsigned int     w,
            h;
    Pixmap  stipple;
    int     bitmap_pad;
    GC      image_gc;
    XGCValues image_vals;
    XImage *stip_image;

    if (!XQueryBestStipple(disp, able, width, height, &w, &h)) {
	/* Can't query best stipple */
	return (Pixmap) 0;
    }
    if ((w > width) || (h > height)) {
	/* Given pattern is too small */
	return (Pixmap) 0;
    }
    if (!(stipple = XCreatePixmap(disp, able, w, h, 1))) {
	/* Can't create pixmap image */
	return (Pixmap) 0;
    }
    bitmap_pad = 8;
    stip_image = XCreateImage(disp, DefaultVisual(disp, DefaultScreen(disp)),
			      1, XYPixmap, 0, bits, width, height,
			      bitmap_pad, 0);
    if (!stip_image)
	return (Pixmap) 0;
    image_gc = XCreateGC(disp, stipple, (unsigned long) 0, &image_vals);
    XPutImage(disp, stipple, image_gc, stip_image, 0, 0, 0, 0, w, h);
    return stipple;
}


static  Pixmap
gray_map(win)
Window  win;

/*
 * Returns a gray pixmap suitable for stipple fill.
 */
{
    static Pixmap map = (Pixmap) 0;

    if (!map) {
	map = make_stipple(t_disp, win, gray_bits, gray_width, gray_height);
    }
    return map;
}

static  GC
set_gc(win, fg, bg, font, gray_p)
Window  win;			/* For creating GC  */
unsigned long fg;		/* Foreground pixel */
unsigned long bg;		/* Background pixel */
Font    font;			/* Font             */
int     gray_p;			/* Gray if set      */

/*
 * Sets and returns the fields listed above in a global graphics context.
 * If graphics context does not exist,  it is created.
 */
{
    static GC t_gc = (GC) 0;
    XGCValues gcvals;
    unsigned long gcmask;

    gcvals.foreground = fg;
    gcvals.background = bg;
    gcvals.font = font;
    gcvals.stipple = gray_map(win);
    gcvals.fill_style = (gray_p ? FillStippled : FillSolid);
    gcmask = GCForeground | GCBackground | GCFont | GCFillStyle | GCStipple;
    if (t_gc == (GC) 0) {
	t_gc = XCreateGC(t_disp, win, gcmask, &gcvals);
    }
    else {
	XChangeGC(t_disp, t_gc, gcmask, &gcvals);
    }
    return t_gc;
}



static XContext h_context = (XContext) 0;

void
xtb_register(win, func, info)
Window  win;

FNPTR(func, xtb_hret, (XEvent * evt, xtb_data info));
xtb_data info;

/*
 * Associates the event handling function `func' with the window
 * `win'.  Additional information `info' will be passed to `func'.
 * The routine should return one of the return codes given above.
 */
{
    struct h_info *new_info;

    if (h_context == (XContext) 0) {
	h_context = XUniqueContext();
    }
    new_info = (struct h_info *) Malloc(sizeof(struct h_info));
    new_info->func = func;
    new_info->info = info;
    XSaveContext(t_disp, win, h_context, (caddr_t) new_info);
}

xtb_data
xtb_lookup(win)
Window  win;

/*
 * Returns the associated data with window `win'.
 */
{
    xtb_data data;

    if (!XFindContext(t_disp, win, h_context, (XPointer*) &data)) {
	return ((struct h_info *) data)->info;
    }
    else {
	return (xtb_data) 0;
    }
}

xtb_hret
xtb_dispatch(evt)
XEvent *evt;

/*
 * Dispatches an event to a handler if its ours.  Returns one of
 * the return codes given above (XTB_NOTDEF, XTB_HANDLED, or XTB_STOP).
 */
{
    struct h_info *info;

    if (!XFindContext(t_disp, evt->xany.window, h_context, (caddr_t *) & info)) {
	if (info->func)
	    return info->func (evt, info->info);
	else
	    return XTB_NOTDEF;
    }
    else
	return XTB_NOTDEF;
}

int
xtb_unregister(win, info)
Window  win;
xtb_data *info;

/*
 * Removes `win' from the dialog association table.  `info' is
 * returned to allow the user to delete it (if desired).  Returns
 * a non-zero status if the association was found and properly deleted.
 */
{
    struct h_info *hi;

    if (!XFindContext(t_disp, win, h_context, (caddr_t *) & hi)) {
	(void) XDeleteContext(t_disp, win, h_context);
	*info = hi->info;
	Free((char *) hi);
	return 1;
    }
    else
	return 0;
}



#define BT_HPAD	3
#define BT_VPAD	2
#define BT_LPAD	3
#define BT_BRDR	1

struct b_info {
    FNPTR(func, xtb_hret, (Window win, int state, xtb_data val));
    /* Function to call */
    char   *text;		/* Text of button   */
    int     flag;		/* State of button  */
    int     na;			/* Non-zero if not active */
    int     line_y,
            line_w;		/* Entry/Exit line  */
    xtb_data val;		/* User defined info */
};

static void
bt_draw(win, ri)
Window  win;
struct b_info *ri;

/*
 * Draws a button window
 */
{
    if (ri->flag) {
	XDrawImageString(t_disp, win,
			 set_gc(win, back_pix, norm_pix, norm_font->fid, 0),
			 BT_HPAD, BT_VPAD + norm_font->ascent,
			 ri->text, strlen(ri->text));
    }
    else {
	XDrawImageString(t_disp, win,
			 set_gc(win, norm_pix, back_pix, norm_font->fid, 0),
			 BT_HPAD, BT_VPAD + norm_font->ascent,
			 ri->text, strlen(ri->text));
    }
    if (ri->na) {
	Window  root;
	int     x,
	        y;
	unsigned int w,
	        h,
	        b,
	        d;

	XGetGeometry(t_disp, win, &root, &x, &y, &w, &h, &b, &d);
	XFillRectangle(t_disp, win,
		       set_gc(win, (ri->flag ? norm_pix : back_pix),
			      back_pix, norm_font->fid, 1),
		       0, 0, w, h);
    }
}

static void
bt_line(win, ri, pix)
Window  win;
struct b_info *ri;
unsigned long pix;

/*
 * Draws a status line beneath the text to indicate the
 * user has moved into the button.
 */
{
    XDrawLine(t_disp, win,
	      set_gc(win, pix, back_pix, norm_font->fid, ri->na),
	      BT_HPAD, ri->line_y, BT_HPAD + ri->line_w, ri->line_y);
}

static  xtb_hret
bt_h(evt, info)
XEvent *evt;
xtb_data info;

/*
 * Handles button events.
 */
{
    Window  win = evt->xany.window;
    struct b_info *ri = (struct b_info *) info;
    xtb_hret rtn = 0;

    switch (evt->type) {
    case Expose:
	bt_draw(win, ri);
	rtn = XTB_HANDLED;
	break;
    case EnterNotify:
	if (!ri->na)
	    bt_line(win, ri, norm_pix);
	rtn = XTB_HANDLED;
	break;
    case LeaveNotify:
	if (!ri->na)
	    bt_line(win, ri, back_pix);
	rtn = XTB_HANDLED;
	break;
    case ButtonPress:
	/* Nothing - just wait for button up */
	rtn = XTB_HANDLED;
	break;
    case ButtonRelease:
	if (!ri->na)
	    rtn = ri->func (win, ri->flag, ri->val);
	break;
    default:
	rtn = XTB_NOTDEF;
    }
    return rtn;
}

void
xtb_bt_new(win, text, func, val, frame)
Window  win;			/* Parent window     */
char   *text;			/* Text in button    */

FNPTR(func, xtb_hret, (Window, int, xtb_data));	/* Callback */
xtb_data val;			/* User data         */
xtb_frame *frame;		/* Size (RETURN)     */

/*
 * Makes a new button under `win' with the text `text'.  The
 * window, size, and position of the button are returned in `frame'.
 * The initial position is always (0, 0).  When the
 * button is pressed,  `func' will be called with the button
 * window,  the current state of the button,  and `val'.
 * It is up to `func' to change the state of the button (if desired).
 * The routine should return XTB_HANDLED normally and XTB_STOP if the
 * dialog should stop.  The window will be automatically mapped.
 */
{
    XCharStruct bb;
    struct b_info *info;
    int     dir,
            ascent,
            descent;

    XTextExtents(norm_font, text, strlen(text), &dir, &ascent, &descent, &bb);
    frame->width = bb.width + 2 * BT_HPAD;
    frame->height = norm_font->ascent + norm_font->descent + BT_VPAD + BT_LPAD;
    frame->x_loc = frame->y_loc = 0;
    frame->win = XCreateSimpleWindow(t_disp, win,
				     frame->x_loc, frame->y_loc,
				     frame->width, frame->height,
				     BT_BRDR, norm_pix, back_pix);
    XSelectInput(t_disp, frame->win, ExposureMask |
		 ButtonPressMask | ButtonReleaseMask |
		 EnterWindowMask | LeaveWindowMask);
    info = (struct b_info *) Malloc(sizeof(struct b_info));
    info->func = func;
    info->text = STRDUP(text);
    info->flag = 0;
    info->na = 0;
    info->val = val;
    info->line_y = frame->height - 2;
    info->line_w = frame->width - 2 * BT_HPAD;
    xtb_register(frame->win, bt_h, (xtb_data) info);
    XMapWindow(t_disp, frame->win);
    frame->width += (2 * BT_BRDR);
    frame->height += (2 * BT_BRDR);
}

int
xtb_bt_get(win, stuff, na)
Window  win;
xtb_data *stuff;
int    *na;

/*
 * Returns the state of button `win'.  If provided,  the button
 * specific info is returned in `info' and the active state
 * of the button is returned in `na'.
 */
{
    struct b_info *info = (struct b_info *) xtb_lookup(win);

    if (stuff)
	*stuff = info->val;
    if (na)
	*na = info->na;
    return info->flag;
}

int
xtb_bt_set(win, val, stuff, na)
Window  win;
int     val;
xtb_data stuff;
int     na;

/*
 * Changes the value of a button and returns the new state.
 * The button is drawn.  If set,  the button specific info
 * will be set to `info'.  This doesn't allow you to set
 * the state to zero, but that may not be important.  If
 * `na' is non-zero,  the button will be deactivated (no
 * activity will be allowed). The change in button appearance
 * will be immediate.
 */
{
    struct b_info *info = (struct b_info *) xtb_lookup(win);

    info->flag = (val != 0);
    info->na = (na != 0);
    if (stuff)
	info->val = stuff;
    bt_draw(win, info);
    XFlush(t_disp);
    return info->flag;
}

void
xtb_bt_del(win, info)
Window  win;
xtb_data *info;

/*
 * Deletes the button `win' and returns the user defined information
 * in `info' for destruction.
 */
{
    struct b_info *bi;

    if (xtb_unregister(win, (xtb_data *) & bi)) {
	*info = bi->val;
	Free((char *) bi->text);
	Free((char *) bi);
	XDestroyWindow(t_disp, win);
    }
}



#define BR_XPAD		2
#define BR_YPAD		2
#define BR_INTER	2

struct br_info {
    Window  main_win;		/* Main button row    */
    int     which_one;		/* Which button is on */
    int     btn_cnt;		/* How many buttons   */
            FNPTR(func, xtb_hret, (Window win, int prev, int this, xtb_data val));
    xtb_data val;		/* User data          */
    Window *btns;		/* Button windows     */
};

/*ARGSUSED*/
static  xtb_hret
br_h(win, val, info)
Window  win;
int     val;
xtb_data info;

/*
 * This handles events for button rows.  When a button is pressed,
 * it turns off the button selected in `which_one' and turns itself
 * on.
 */
{
    struct br_info *real_info = (struct br_info *) info;
    int     i,
            prev;

    prev = real_info->which_one;
    if ((prev >= 0) && (prev < real_info->btn_cnt)) {
	(void) xtb_bt_set(real_info->btns[prev], 0, (xtb_data) 0, 0);
    }
    for (i = 0; i < real_info->btn_cnt; i++) {
	if (win == real_info->btns[i]) {
	    real_info->which_one = i;
	    break;
	}
    }
    (void) xtb_bt_set(win, 1, (xtb_data) 0, 0);
    /* Callback */
    if (real_info->func) {
	return real_info->func (real_info->main_win,
				   prev, real_info->which_one,
				   real_info->val);
    }
    else {
	return XTB_HANDLED;
    }
}


void
xtb_br_new(win, cnt, lbls, init, func, val, frame)
Window  win;			/* Parent window    */
int     cnt;			/* Count of buttons */
char   *lbls[];			/* Button labels    */
int     init;			/* Initial button   */

FNPTR(func, xtb_hret, (Window, int, int, xtb_data));	/* Callback */
xtb_data val;			/* User data        */
xtb_frame *frame;		/* Returned size    */

/*
 * This routine makes a new row of buttons in the window `win'
 * and returns a frame containing all of these buttons.  These
 * buttons are designed so that only one of them will be active
 * at a time.  Initially,  button `init' will be activated (if
 * init is less than zero,  none will be initially activated).
 * Whenever a button is pushed, `func' will be called with the
 * button row window,  the index of the previous button (-1 if
 * none),  the index of the current button,  and the user data, `val'.
 * The function is optional (if zero,  no function will be called).
 * The size of the row is returned in `frame'.  The window
 * will be automatically mapped.  Initially,  the window containing
 * the buttons will be placed at 0,0 in the parent window.
 */
{
    struct br_info *info;
    xtb_frame sub_frame;
    int     i,
            x,
            y;

    frame->width = frame->height = 0;
    frame->x_loc = frame->y_loc = 0;
    frame->win = XCreateSimpleWindow(t_disp, win, 0, 0, 1, 1,
				     0, back_pix, back_pix);
    info = (struct br_info *) Malloc(sizeof(struct br_info));
    info->main_win = frame->win;
    info->btns = (Window *) Malloc((unsigned) (sizeof(Window) * cnt));
    info->btn_cnt = cnt;
    info->which_one = init;
    info->func = func;
    info->val = val;
    /* the handler is used simply to get information out */
    xtb_register(frame->win, (xtb_hret(*) ()) 0, (xtb_data) info);
    x = BR_XPAD;
    y = BR_YPAD;
    for (i = 0; i < cnt; i++) {
	xtb_bt_new(frame->win, lbls[i], br_h, (xtb_data) info, &sub_frame);
	info->btns[i] = sub_frame.win;
	XMoveWindow(t_disp, info->btns[i], x, y);
	x += (BR_INTER + sub_frame.width);
	if (sub_frame.height > frame->height)
	    frame->height = sub_frame.height;
	if (i == init)
	    (void) xtb_bt_set(info->btns[i], 1, (xtb_data) 0, 0);
    }
    frame->width = x - BR_INTER + BR_XPAD;
    frame->height += (2 * BR_YPAD);
    XResizeWindow(t_disp, frame->win, frame->width, frame->height);
    XMapWindow(t_disp, frame->win);
}

int
xtb_br_get(win)
Window  win;

/*
 * This routine returns the index of the currently selected item of
 * the button row given by the window `win'.  Note:  no checking
 * is done to make sure `win' is a button row.
 */
{
    struct br_info *info = (struct br_info *) xtb_lookup(win);

    return info->which_one;
}

void
xtb_br_del(win)
Window  win;

/*
 * Deletes a button row.  All resources are reclaimed.
 */
{
    struct br_info *info;
    int     i;

    if (xtb_unregister(win, (xtb_data *) & info)) {
	for (i = 0; i < info->btn_cnt; i++) {
	    xtb_bt_del(info->btns[i], (xtb_data *) & info);
	}
	Free((char *) info->btns);
	Free((char *) info);
	XDestroyWindow(t_disp, win);
    }
}



/* Text widget */

#define TO_HPAD	1
#define TO_VPAD	1

struct to_info {
    char   *text;		/* Text to display */
    XFontStruct *ft;		/* Font to use     */
};

static void
to_draw(win, ri)
Window  win;
struct to_info *ri;

/*
 * Draws the text for a widget
 */
{
    XDrawImageString(t_disp, win,
		     set_gc(win, norm_pix, back_pix, ri->ft->fid, 0),
		     TO_HPAD, TO_VPAD + ri->ft->ascent,
		     ri->text, strlen(ri->text));
}

static  xtb_hret
to_h(evt, info)
XEvent *evt;
xtb_data info;

/*
 * Handles text widget events
 */
{
    Window  win = evt->xany.window;
    struct to_info *ri = (struct to_info *) info;

    switch (evt->type) {
    case Expose:
	to_draw(win, ri);
	return XTB_HANDLED;
    default:
	return XTB_NOTDEF;
    }
}

void
xtb_to_new(win, text, ft, frame)
Window  win;			/* Parent window */
char   *text;			/* Text          */
XFontStruct *ft;		/* Font to use   */
xtb_frame *frame;		/* Returned size */

/*
 * Makes a new text widget under `win' with the text `text'.
 * The size of the widget is returned in `w' and `h'.  The
 * window is created and mapped at 0,0 in `win'.  The font
 * used for the text is given in `ft'.
 */
{
    struct to_info *info;

    frame->width = XTextWidth(ft, text, strlen(text)) + 2 * TO_HPAD;
    frame->height = ft->ascent + ft->descent + 2 * TO_VPAD;
    frame->x_loc = frame->y_loc = 0;
    frame->win = XCreateSimpleWindow(t_disp, win, 0, 0,
				     frame->width, frame->height, 0,
				     back_pix, back_pix);
    XSelectInput(t_disp, frame->win, ExposureMask);
    info = (struct to_info *) Malloc(sizeof(struct to_info));
    info->text = STRDUP(text);
    info->ft = ft;
    xtb_register(frame->win, to_h, (xtb_data) info);
    XMapWindow(t_disp, frame->win);
}

void
xtb_to_del(win)
Window  win;

/*
 * Deletes an output only text widget.
 */
{
    struct to_info *info;

    if (xtb_unregister(win, (xtb_data *) & info)) {
	if (info->text)
	    Free((char *) info->text);
	Free((char *) info);
	XDestroyWindow(t_disp, win);
    }
}


/*
 * Input text widget
 */

#define TI_HPAD	2
#define TI_VPAD	2
#define TI_LPAD	3
#define TI_BRDR 2
#define TI_CRSP	1

struct ti_info {
    FNPTR(func, xtb_hret, (Window win, int ch, char *textcopy, xtb_data * val));
    /* Function to call   */
    int     maxlen;		/* Maximum characters */
    int     curidx;		/* Current index pos  */
    int     curxval;		/* Current draw loc   */
    char    text[MAXCHBUF];	/* Current text array */
    int     line_y,
            line_w;		/* Entry/Exit line    */
    int     focus_flag;		/* If on, we have focus */
    xtb_data val;		/* User info          */
};

static int
text_width(font, str, len)
XFontStruct *font;		/* What font       */
char   *str;			/* Character array */
int     len;			/* Length of array */

/*
 * Returns the width of a string using XTextExtents.
 */
{
    XCharStruct bb;
    int     dir,
            ascent,
            descent;

    XTextExtents(font, str, len, &dir, &ascent, &descent, &bb);
    return bb.width;
}

static void
ti_cursor_on(win, ri)
Window  win;
struct ti_info *ri;

/*
 * Draws the cursor for the window.  Uses pixel `pix'.
 */
{
    XFillRectangle(t_disp, win,
		   set_gc(win, norm_pix, back_pix, norm_font->fid, 0),
		   ri->curxval + TI_HPAD + TI_CRSP, TI_VPAD,
		   (ri->focus_flag ? 2 : 1),
		   norm_font->ascent + norm_font->descent - 1);
}

static void
ti_cursor_off(win, ri)
Window  win;
struct ti_info *ri;

/*
 * Draws the cursor for the window.  Uses pixel `pix'.
 */
{
    XFillRectangle(t_disp, win,
		   set_gc(win, back_pix, back_pix, norm_font->fid, 0),
		   ri->curxval + TI_HPAD + TI_CRSP, TI_VPAD,
		   (ri->focus_flag ? 2 : 1),
		   norm_font->ascent + norm_font->descent - 1);
}

static void
ti_draw(win, ri, c_flag)
Window  win;
struct ti_info *ri;
int     c_flag;

/*
 * Draws the indicated text widget.  This includes drawing the
 * text and cursor.  If `c_flag' is set,  the window will
 * be cleared first.
 */
{
    if (c_flag)
	XClearWindow(t_disp, win);
    /* Text */
    XDrawImageString(t_disp, win,
		     set_gc(win, norm_pix, back_pix, norm_font->fid, 0),
		     TI_HPAD, TI_VPAD + norm_font->ascent,
		     ri->text, strlen(ri->text));
    /* Cursor */
    ti_cursor_on(win, ri);
}

static void
ti_line(win, ri, pix)
Window  win;
struct ti_info *ri;
unsigned long pix;

/*
 * Draws a status line beneath the text in a text widget to indicate
 * the user has moved into the text field.
 */
{
    XDrawLine(t_disp, win,
	      set_gc(win, pix, back_pix, norm_font->fid, 0),
	      TI_HPAD, ri->line_y, TI_HPAD + ri->line_w, ri->line_y);
}

/* For debugging */
focus_evt(evt)
XEvent *evt;
{
    switch (evt->xfocus.mode) {
    case NotifyNormal:
	printf("NotifyNormal");
	break;
    case NotifyGrab:
	printf("NotifyGrab");
	break;
    case NotifyUngrab:
	printf("NotifyUngrab");
	break;
    }
    printf(", detail = ");
    switch (evt->xfocus.detail) {
    case NotifyAncestor:
	printf("NotifyAncestor");
	break;
    case NotifyVirtual:
	printf("NotifyVirtual");
	break;
    case NotifyInferior:
	printf("NotifyInferior");
	break;
    case NotifyNonlinear:
	printf("NotifyNonLinear");
	break;
    case NotifyNonlinearVirtual:
	printf("NotifyNonLinearVirtual");
	break;
    case NotifyPointer:
	printf("NotifyPointer");
	break;
    case NotifyPointerRoot:
	printf("NotifyPointerRoot");
	break;
    case NotifyDetailNone:
	printf("NotifyDetailNone");
	break;
    }
    printf("\n");
}



static  xtb_hret
ti_h(evt, info)
XEvent *evt;
xtb_data info;

/*
 * Handles text input events.
 */
{
    Window  win = evt->xany.window;
    struct ti_info *ri = (struct ti_info *) info;
    char    keys[MAXKEYS],
            textcopy[MAXCHBUF];
    xtb_hret rtn = 0;
    int     nbytes,
            i;

    switch (evt->type) {
    case Expose:
	ti_draw(win, ri, 0);
	rtn = XTB_HANDLED;
	break;
    case KeyPress:
	nbytes = XLookupString(&evt->xkey, keys, MAXKEYS,
			       (KeySym *) 0, (XComposeStatus *) 0);
	for (i = 0; i < nbytes; i++) {
	    (void) strcpy(textcopy, ri->text);
	    if ((rtn = ri->func (win, (int) keys[i],
				    textcopy, ri->val)) == XTB_STOP)
		break;
	}
	break;
    case FocusIn:
	focus_evt(evt);
	if (evt->xfocus.detail != NotifyPointer) {
	    ti_cursor_off(win, ri);
	    ri->focus_flag = 1;
	    ti_cursor_on(win, ri);
	}
	break;
    case FocusOut:
	focus_evt(evt);
	if (evt->xfocus.detail != NotifyPointer) {
	    ti_cursor_off(win, ri);
	    ri->focus_flag = 0;
	    ti_cursor_on(win, ri);
	}
	break;
    case EnterNotify:
	ti_line(win, ri, norm_pix);
	rtn = XTB_HANDLED;
	break;
    case LeaveNotify:
	ti_line(win, ri, back_pix);
	rtn = XTB_HANDLED;
	break;
    case ButtonPress:
	/* Wait for release */
	break;
    case ButtonRelease:
	/* Set input focus */
	XSetInputFocus(t_disp, win, RevertToParent, CurrentTime);
	break;
    default:
	rtn = XTB_NOTDEF;
	break;
    }
    return rtn;
}

void
xtb_ti_new(win, text, maxchar, func, val, frame)
Window  win;			/* Parent window      */
char   *text;			/* Initial text       */
int     maxchar;		/* Maximum characters */

FNPTR(func, xtb_hret, (Window, int, char *, xtb_data *));	/* Callback */
xtb_data val;			/* User data          */
xtb_frame *frame;		/* Returned size      */

/*
 * This routine creates a new editable text widget under `win'
 * with the initial text `text'.  The widget contains only
 * one line of text which cannot exceed `maxchar' characters.
 * The size of the widget is returned in `frame'.  Each
 * time a key is pressed in the window,  `func' will be called
 * with the window, the character, a copy of the text, and `val'.
 * The state of the widget can be changed by the routines below.
 * May set window to zero if the maximum overall character width
 * (MAXCHBUF) is exceeded.
 */
{
    struct ti_info *info;

    if (maxchar >= MAXCHBUF) {
	frame->win = (Window) 0;
	return;
    }
    frame->width = XTextWidth(norm_font, "8", 1) * maxchar + 2 * TI_HPAD;
    frame->height = norm_font->ascent + norm_font->descent + TI_VPAD + TI_LPAD;
    frame->x_loc = frame->y_loc = 0;
    frame->win = XCreateSimpleWindow(t_disp, win, 0, 0,
				     frame->width, frame->height, TI_BRDR,
				     norm_pix, back_pix);
    XSelectInput(t_disp, frame->win, ExposureMask | KeyPressMask |
		 EnterWindowMask | LeaveWindowMask |
		 FocusChangeMask | ButtonPressMask |
		 ButtonReleaseMask);
    info = (struct ti_info *) Malloc(sizeof(struct ti_info));
    info->func = func;
    info->val = val;
    info->maxlen = maxchar;
    if (text)
	(void) strcpy(info->text, text);
    else
	info->text[0] = '\0';
    info->curidx = strlen(info->text);
    info->curxval = text_width(norm_font, info->text, info->curidx);
    info->line_y = frame->height - 2;
    info->line_w = frame->width - 2 * TI_HPAD;
    info->focus_flag = 0;
    xtb_register(frame->win, ti_h, (xtb_data) info);
    XMapWindow(t_disp, frame->win);
    frame->width += (2 * TI_BRDR);
    frame->height += (2 * TI_BRDR);
}

void
xtb_ti_get(win, text, val)
Window  win;			/* Widget widnow  */
char    text[MAXCHBUF];		/* Filled in text */
xtb_data *val;			/* User info      */

/*
 * This routine returns the information associated with text
 * widget `win'.  The text is filled into the passed buffer
 * `text' which should be MAXCHBUF characters in size.  If
 * `val' is non-zero,  the user supplied info is returned there.
 */
{
    struct ti_info *info = (struct ti_info *) xtb_lookup(win);

    if (val)
	*val = info->val;
    (void) strcpy(text, info->text);
}

int
xtb_ti_set(win, text, val)
Window  win;			/* Widget window    */
char   *text;			/* Replacement text */
xtb_data val;			/* User info        */

/*
 * This routine sets the text of a text widget.  The widget
 * will be redrawn.  Note:  for incremental changes,  ti_ins and
 * ti_dch should be used.  If `val' is non-zero,  it will replace
 * the user information for the widget.  The widget is redrawn.
 * Will return zero if `text' is too long.
 */
{
    struct ti_info *info = (struct ti_info *) xtb_lookup(win);
    int     newlen;

    if (text) {
	if ((newlen = strlen(text)) >= info->maxlen)
	    return 0;
    }
    else {
	newlen = 0;
    }
    info->curidx = newlen;
    if (text)
	(void) strcpy(info->text, text);
    else
	info->text[0] = '\0';
    info->curxval = text_width(norm_font, info->text, info->curidx);
    if (val)
	info->val = val;
    ti_draw(win, info, 1);
    return 1;
}

int
xtb_ti_ins(win, ch)
Window  win;			/* Widget window */
int     ch;			/* Character     */

/*
 * Inserts the character `ch' onto the end of the text for `win'.
 * Will return zero if there isn't any more room left.  Does
 * all appropriate display updates.
 */
{
    struct ti_info *info = (struct ti_info *) xtb_lookup(win);
    char    lstr[1];

    if (info->curidx >= info->maxlen - 1)
	return 0;
    info->text[info->curidx] = ch;
    info->text[info->curidx + 1] = '\0';
    /* Turn off cursor */
    ti_cursor_off(win, info);
    /* Text */
    lstr[0] = (char) ch;
    XDrawImageString(t_disp, win,
		     set_gc(win, norm_pix, back_pix, norm_font->fid, 0),
		     info->curxval + TI_HPAD, TI_VPAD + norm_font->ascent,
		     lstr, 1);
    info->curidx += 1;
    info->curxval += text_width(norm_font, lstr, 1);
    ti_cursor_on(win, info);
    return 1;
}

int
xtb_ti_dch(win)
Window  win;			/* Widget window */

/*
 * Deletes the character at the end of the text for `win'.  Will
 * return zero if there aren't any characters to delete.  Does
 * all appropriate display updates.
 */
{
    struct ti_info *info = (struct ti_info *) xtb_lookup(win);
    int     chw;

    if (info->curidx == 0)
	return 0;
    /* Wipe out cursor */
    ti_cursor_off(win, info);
    info->curidx -= 1;
    chw = text_width(norm_font, &(info->text[info->curidx]), 1);
    info->curxval -= chw;
    /* Wipe out character */
    XClearArea(t_disp, win, info->curxval + TI_HPAD, TI_VPAD,
	       (unsigned int) chw + 1,
	       (unsigned int) norm_font->ascent + norm_font->descent,
	       False);
    info->text[info->curidx] = '\0';
    ti_cursor_on(win, info);
    return 1;
}

void
xtb_ti_del(win, info)
Window  win;
xtb_data *info;

/*
 * Deletes an input text widget.  User defined data is returned in `info'.
 */
{
    struct ti_info *ti;

    if (xtb_unregister(win, (xtb_data *) & ti)) {
	*info = ti->val;
	Free((char *) ti);
	XDestroyWindow(t_disp, win);
    }
}


/*
 * Simple colored output frame - usually used for drawing lines
 */

void
xtb_bk_new(win, width, height, frame)
Window  win;			/* Parent window */
unsigned width,
        height;			/* Size          */
xtb_frame *frame;		/* Returned size */

/*
 * This routine creates a new frame that displays a block
 * of color whose size is given by `width' and `height'.
 * It is usually used to draw lines.  No user interaction
 * is defined for the frame.  The color used is the default
 * foreground color set in xtb_init().
 */
{
    frame->x_loc = frame->y_loc = 0;
    frame->width = width;
    frame->height = height;
    frame->win = XCreateSimpleWindow(t_disp, win,
				     frame->x_loc, frame->y_loc,
				     frame->width, frame->height,
				     0, norm_pix, norm_pix);
    XMapWindow(t_disp, frame->win);
}


void
xtb_bk_del(win)
Window  win;

/*
 * Deletes a block frame.
 */
{
    XDestroyWindow(t_disp, win);
}




/*
 * Formatting support
 */

#define ERROR(msg) printf("%s\n", msg); abort();

xtb_fmt *
xtb_w(w)
xtb_frame *w;

/*
 * Returns formatting structure for a widget.
 */
{
    xtb_fmt *ret;

    ret = (xtb_fmt *) Malloc((unsigned) sizeof(xtb_fmt));
    ret->wid.type = W_TYPE;
    ret->wid.w = w;
    return ret;
}

VARARGS(xtb_hort, xtb_fmt *, (xtb_just just, int padding, int interspace,...))
/*
 * Builds a horizontal structure
 */
{
    va_list ap;
    xtb_fmt *ret,
           *val;

#ifdef __STDC__
    va_start(ap, interspace);
#else
    xtb_just just;
    int     padding,
            interspace;

    va_start(ap);
    just = va_arg(ap, xtb_just);
    padding = va_arg(ap, int);
    interspace = va_arg(ap, int);
#endif
    ret = (xtb_fmt *) Malloc((unsigned) sizeof(xtb_fmt));
    ret->align.type = A_TYPE;
    ret->align.dir = HORIZONTAL;
    ret->align.just = just;
    ret->align.padding = padding;
    ret->align.interspace = interspace;
    /* Build array of incoming xtb_fmt structures */
    ret->align.ni = 0;
    while ((val = va_arg(ap, xtb_fmt *)) != (xtb_fmt *) 0) {
	if (ret->align.ni < MAX_BRANCH) {
	    ret->align.items[ret->align.ni] = val;
	    ret->align.ni++;
	}
	else {
	    ERROR("too many branches\n");
	}
    }
    return ret;
}


VARARGS(xtb_vert, xtb_fmt *, (xtb_just just, int padding, int interspace,...))
/*
 * Builds a vertical structure
 */
{
    va_list ap;
    xtb_fmt *ret,
           *val;

#ifdef __STDC__
    va_start(ap, interspace);
#else
    xtb_just just;
    int     padding,
            interspace;

    va_start(ap);
    just = va_arg(ap, xtb_just);
    padding = va_arg(ap, int);
    interspace = va_arg(ap, int);
#endif
    ret = (xtb_fmt *) Malloc((unsigned) sizeof(xtb_fmt));
    ret->align.type = A_TYPE;
    ret->align.dir = VERTICAL;
    ret->align.just = just;
    ret->align.padding = padding;
    ret->align.interspace = interspace;
    /* Build array of incoming xtb_fmt structures */
    ret->align.ni = 0;
    while ((val = va_arg(ap, xtb_fmt *)) != (xtb_fmt *) 0) {
	if (ret->align.ni < MAX_BRANCH) {
	    ret->align.items[ret->align.ni] = val;
	    ret->align.ni++;
	}
	else {
	    ERROR("too many branches\n");
	}
    }
    return ret;
}


static void
xtb_fmt_setpos(def, x, y)
xtb_fmt *def;
int     x,
        y;

/*
 * Sets all position fields of widgets in `def' to x,y.
 */
{
    int     i;

    switch (def->type) {
    case W_TYPE:
	def->wid.w->x_loc = x;
	def->wid.w->y_loc = y;
	break;
    case A_TYPE:
	for (i = 0; i < def->align.ni; i++) {
	    xtb_fmt_setpos(def->align.items[i], x, y);
	}
	break;
    default:
	ERROR("bad type");
    }
}


static void
xtb_fmt_addpos(def, x, y)
xtb_fmt *def;
int     x,
        y;

/*
 * Adds the offset specified to all position fields of widgets in `def'.
 */
{
    int     i;

    switch (def->type) {
    case W_TYPE:
	def->wid.w->x_loc += x;
	def->wid.w->y_loc += y;
	break;
    case A_TYPE:
	for (i = 0; i < def->align.ni; i++) {
	    xtb_fmt_addpos(def->align.items[i], x, y);
	}
	break;
    default:
	ERROR("bad type");
    }
}

static void
xtb_fmt_hort(nd, defs, widths, heights, just, pad, inter, rw, rh)
int     nd;			/* Number of children     */
xtb_fmt *defs[];		/* Definitions themselves */
unsigned int     widths[];		/* Widths of children     */
unsigned int     heights[];		/* Heights of children    */
xtb_just just;			/* Justification          */
int     pad,
        inter;			/* Padding and interspace */
unsigned int    *rw,
       *rh;			/* Returned size          */

/*
 * Formats items horizontally subject to the widths and heights
 * of the items passed.
 */
{
    int     i;
    int     max_height = 0;
    int     tot_width = 0;
    int     xspot;

    /* Find parameters */
    for (i = 0; i < nd; i++) {
	if (heights[i] > max_height)
	    max_height = heights[i];
	tot_width += widths[i];
    }
    /* Place items -- assumes center justification */
    xspot = pad;
    for (i = 0; i < nd; i++) {
	switch (just) {
	case XTB_TOP:
	    xtb_fmt_addpos(defs[i], xspot, pad);
	    break;
	case XTB_BOTTOM:
	    xtb_fmt_addpos(defs[i], xspot, max_height - heights[i] + pad);
	    break;
	case XTB_CENTER:
	default:
	    /* Everyone else center */
	    xtb_fmt_addpos(defs[i], xspot, (max_height - heights[i]) / 2 + pad);
	    break;
	}
	xspot += (widths[i] + inter);
    }
    /* Figure out resulting size */
    *rw = tot_width + (nd - 1) * inter + (2 * pad);
    *rh = max_height + (2 * pad);
}


static void
xtb_fmt_vert(nd, defs, widths, heights, just, pad, inter, rw, rh)
int     nd;			/* Number of children     */
xtb_fmt *defs[];		/* Definitions themselves */
unsigned int     widths[];		/* Widths of children     */
unsigned int     heights[];		/* Heights of children    */
xtb_just just;			/* Justification          */
int     pad,
        inter;			/* Padding and interspace */
unsigned int    *rw,
       *rh;			/* Returned size          */

/*
 * Formats items vertically subject to the widths and heights
 * of the items passed.
 */
{
    int     i;
    int     max_width = 0;
    int     tot_height = 0;
    int     yspot;

    /* Find parameters */
    for (i = 0; i < nd; i++) {
	if (widths[i] > max_width)
	    max_width = widths[i];
	tot_height += heights[i];
    }
    /* Place items -- assumes center justification */
    yspot = pad;
    for (i = 0; i < nd; i++) {
	switch (just) {
	case XTB_LEFT:
	    xtb_fmt_addpos(defs[i], pad, yspot);
	    break;
	case XTB_RIGHT:
	    xtb_fmt_addpos(defs[i], max_width - widths[i] + pad, yspot);
	    break;
	case XTB_CENTER:
	default:
	    /* Everyone else center */
	    xtb_fmt_addpos(defs[i], (max_width - widths[i]) / 2 + pad, yspot);
	    break;
	}
	yspot += (heights[i] + inter);
    }
    /* Figure out resulting size */
    *rw = max_width + (2 * pad);
    *rh = tot_height + (nd - 1) * inter + (2 * pad);
}

static void
xtb_fmt_top(def, w, h)
xtb_fmt *def;
unsigned *w,
       *h;

/*
 * Recursive portion of formatter
 */
{
    unsigned widths[MAX_BRANCH];
    unsigned heights[MAX_BRANCH];
    int     i;

    switch (def->type) {
    case A_TYPE:
	/* Formatting directive */
	/* place children and determine sizes */
	for (i = 0; i < def->align.ni; i++) {
	    xtb_fmt_top(def->align.items[i], &(widths[i]), &(heights[i]));
	}
	/* now format based on direction */
	switch (def->align.dir) {
	case HORIZONTAL:
	    xtb_fmt_hort(def->align.ni, def->align.items, widths, heights,
			 def->align.just, def->align.padding,
			 def->align.interspace, w, h);
	    break;
	case VERTICAL:
	    xtb_fmt_vert(def->align.ni, def->align.items, widths, heights,
			 def->align.just, def->align.padding,
			 def->align.interspace, w, h);
	    break;
	default:
	    ERROR("bad direction");
	}
	break;
    case W_TYPE:
	/* Simple widget - return size */
	*w = def->wid.w->width;
	*h = def->wid.w->height;
	break;
    default:
	ERROR("bad type");
    }
}

#ifdef DEBUG
static void
xtb_fmt_debug(def)
xtb_fmt *def;

/*
 * Dumps formatting structure for debugging purposes.
 */
{
    int     i;

    switch (def->type) {
    case W_TYPE:
	printf("%d %d %d %d\n",
	       def->wid.w->x_loc, def->wid.w->y_loc,
	       def->wid.w->width, def->wid.w->height);
	break;
    case A_TYPE:
	for (i = 0; i < def->align.ni; i++) {
	    xtb_fmt_debug(def->align.items[i]);
	}
	break;
    default:
	ERROR("bad type");
    }
}

#endif

xtb_fmt *
xtb_fmt_do(def, w, h)
xtb_fmt *def;
unsigned *w,
       *h;

/*
 * Actually does formatting
 */
{
    /* First zero out all positions */
    xtb_fmt_setpos(def, 0, 0);

    /* Now call recursive portion */
    xtb_fmt_top(def, w, h);

#ifdef DEBUG
    xtb_fmt_debug(def);
#endif
    return def;
}

void
xtb_fmt_free(def)
xtb_fmt *def;

/*
 * Frees resources associated with formatting routines
 */
{
    int     i;

    if (def->type == A_TYPE) {
	for (i = 0; i < def->align.ni; i++) {
	    xtb_fmt_free(def->align.items[i]);
	}
    }
    Free((char *) def);
}

void
xtb_mv_frames(nf, frames)
int     nf;			/* Number of frames */
xtb_frame frames[];		/* Array of frames  */

/*
 * Moves frames to the location indicated in the frame
 * structure for each item.
 */
{
    int     i;

    for (i = 0; i < nf; i++) {
	XMoveWindow(t_disp, frames[i].win, frames[i].x_loc, frames[i].y_loc);
    }
}