/*
 * winctrls.c: routines to self-manage the controls in a dialog
 * box.
 */

#include <windows.h>
#include <commctrl.h>

#include "winstuff.h"

#define GAPBETWEEN 3
#define GAPWITHIN 1
#define GAPXBOX 7
#define GAPYBOX 4
#define DLGWIDTH 168
#define STATICHEIGHT 8
#define CHECKBOXHEIGHT 8
#define RADIOHEIGHT 8
#define EDITHEIGHT 12
#define COMBOHEIGHT 12
#define PUSHBTNHEIGHT 14
#define PROGBARHEIGHT 14

void ctlposinit(struct ctlpos *cp, HWND hwnd,
                int leftborder, int rightborder, int topborder) {
    RECT r, r2;
    cp->hwnd = hwnd;
    cp->font = SendMessage(hwnd, WM_GETFONT, 0, 0);
    cp->ypos = topborder;
    GetClientRect(hwnd, &r);
    r2.left = r2.top = 0;
    r2.right = 4;
    r2.bottom = 8;
    MapDialogRect(hwnd, &r2);
    cp->dlu4inpix = r2.right;
    cp->width = (r.right * 4) / (r2.right) - 2*GAPBETWEEN;
    cp->xoff = leftborder;
    cp->width -= leftborder + rightborder;
}

void doctl(struct ctlpos *cp, RECT r,
           char *wclass, int wstyle, int exstyle,
           char *wtext, int wid) {
    HWND ctl;
    /*
     * Note nonstandard use of RECT. This is deliberate: by
     * transforming the width and height directly we arrange to
     * have all supposedly same-sized controls really same-sized.
     */

    r.left += cp->xoff;
    MapDialogRect(cp->hwnd, &r);

    ctl = CreateWindowEx(exstyle, wclass, wtext, wstyle,
                         r.left, r.top, r.right, r.bottom,
                         cp->hwnd, (HMENU)wid, hinst, NULL);
    SendMessage(ctl, WM_SETFONT, cp->font, MAKELPARAM(TRUE, 0));
}

/*
 * A title bar across the top of a sub-dialog.
 */
void bartitle(struct ctlpos *cp, char *name, int id) {
    RECT r;

    r.left = GAPBETWEEN; r.right = cp->width;
    r.top = cp->ypos; r.bottom = STATICHEIGHT;
    cp->ypos += r.bottom + GAPBETWEEN;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0, name, id);
}

/*
 * Begin a grouping box, with or without a group title.
 */
void beginbox(struct ctlpos *cp, char *name, int idbox, int idtext) {
    if (name)
        cp->ypos += STATICHEIGHT/2;
    cp->boxystart = cp->ypos;
    if (name)
        cp->ypos += STATICHEIGHT - (STATICHEIGHT/2);
    cp->ypos += GAPYBOX;
    cp->width -= 2*GAPXBOX;
    cp->xoff += GAPXBOX;
    cp->boxid = idbox;
    cp->boxtextid = idtext;
    cp->boxtext = name;
}

/*
 * End a grouping box.
 */
void endbox(struct ctlpos *cp) {
    RECT r;
    cp->xoff -= GAPXBOX;
    cp->width += 2*GAPXBOX;
    cp->ypos += GAPYBOX - GAPBETWEEN;
    r.left = GAPBETWEEN; r.right = cp->width;
    r.top = cp->boxystart; r.bottom = cp->ypos - cp->boxystart;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE | SS_ETCHEDFRAME, 0,
          "", cp->boxid);
    if (cp->boxtext) {
        SIZE s;
        HDC hdc;
        HFONT oldfont, dlgfont;
        hdc = GetDC(cp->hwnd);
        dlgfont = (HFONT)cp->font;
        oldfont = SelectObject(hdc, dlgfont);
        GetTextExtentPoint32(hdc, cp->boxtext, strlen(cp->boxtext), &s);
        SelectObject(hdc, oldfont);
        DeleteDC(hdc);
        r.left = GAPXBOX + GAPBETWEEN;
        r.right = (s.cx * 4 + cp->dlu4inpix-1) / cp->dlu4inpix;
        
        r.top = cp->boxystart - STATICHEIGHT/2; r.bottom = STATICHEIGHT;
        doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0,
              cp->boxtext, cp->boxtextid);
    }
    cp->ypos += GAPYBOX;
}

/*
 * Some edit boxes. Each one has a static above it. The percentages
 * of the horizontal space are provided.
 */
void multiedit(struct ctlpos *cp, ...) {
    RECT r;
    va_list ap;
    int percent, xpos;

    percent = xpos = 0;
    va_start(ap, cp);
    while (1) {
        char *text;
        int staticid, editid, pcwidth;
        text = va_arg(ap, char *);
        if (!text)
            break;
        staticid = va_arg(ap, int);
        editid = va_arg(ap, int);
        pcwidth = va_arg(ap, int);

        r.left = xpos + GAPBETWEEN;
        percent += pcwidth;
        xpos = (cp->width + GAPBETWEEN) * percent / 100;
        r.right = xpos - r.left;

        r.top = cp->ypos; r.bottom = STATICHEIGHT;
        doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0,
              text, staticid);
        r.top = cp->ypos + 8 + GAPWITHIN; r.bottom = EDITHEIGHT;
        doctl(cp, r, "EDIT",
              WS_CHILD | WS_VISIBLE | WS_TABSTOP | ES_AUTOHSCROLL,
              WS_EX_CLIENTEDGE,
              "", editid);
    }
    va_end(ap);
    cp->ypos += 8+GAPWITHIN+12+GAPBETWEEN;
}

/*
 * A set of radio buttons on the same line, with a static above
 * them. `nacross' dictates how many parts the line is divided into
 * (you might want this not to equal the number of buttons if you
 * needed to line up some 2s and some 3s to look good in the same
 * panel).
 */
void radioline(struct ctlpos *cp,
               char *text, int id, int nacross, ...) {
    RECT r;
    va_list ap;
    int group;
    int i;

    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = cp->width; r.bottom = STATICHEIGHT;
    cp->ypos += r.bottom + GAPWITHIN;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0, text, id);
    va_start(ap, nacross);
    group = WS_GROUP;
    i = 0;
    while (1) {
        char *btext;
        int bid;
        btext = va_arg(ap, char *);
        if (!btext)
            break;
        bid = va_arg(ap, int);
        r.left = GAPBETWEEN + i * (cp->width+GAPBETWEEN)/nacross;
        r.right = (i+1) * (cp->width+GAPBETWEEN)/nacross - r.left;
        r.top = cp->ypos; r.bottom = RADIOHEIGHT;
        doctl(cp, r, "BUTTON",
              BS_AUTORADIOBUTTON | WS_CHILD | WS_VISIBLE | WS_TABSTOP | group,
              0,
              btext, bid);
        group = 0;
        i++;
    }
    va_end(ap);
    cp->ypos += r.bottom + GAPBETWEEN;
}

/*
 * A set of radio buttons on multiple lines, with a static above
 * them.
 */
void radiobig(struct ctlpos *cp, char *text, int id, ...) {
    RECT r;
    va_list ap;
    int group;

    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = cp->width; r.bottom = STATICHEIGHT;
    cp->ypos += r.bottom + GAPWITHIN;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0, text, id);
    va_start(ap, id);
    group = WS_GROUP;
    while (1) {
        char *btext;
        int bid;
        btext = va_arg(ap, char *);
        if (!btext)
            break;
        bid = va_arg(ap, int);
        r.left = GAPBETWEEN; r.top = cp->ypos;
        r.right = cp->width; r.bottom = STATICHEIGHT;
        cp->ypos += r.bottom + GAPWITHIN;
        doctl(cp, r, "BUTTON",
              BS_AUTORADIOBUTTON | WS_CHILD | WS_VISIBLE | WS_TABSTOP | group,
              0,
              btext, bid);
        group = 0;
    }
    va_end(ap);
    cp->ypos += GAPBETWEEN - GAPWITHIN;
}

/*
 * A single standalone checkbox.
 */
void checkbox(struct ctlpos *cp, char *text, int id) {
    RECT r;

    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = cp->width; r.bottom = CHECKBOXHEIGHT;
    cp->ypos += r.bottom + GAPBETWEEN;
    doctl(cp, r, "BUTTON",
          BS_AUTOCHECKBOX | WS_CHILD | WS_VISIBLE | WS_TABSTOP, 0,
          text, id);
}

/*
 * A single standalone static text control.
 */
void statictext(struct ctlpos *cp, char *text, int id) {
    RECT r;

    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = cp->width; r.bottom = STATICHEIGHT;
    cp->ypos += r.bottom + GAPBETWEEN;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0, text, id);
}

/*
 * A button on the right hand side, with a static to its left.
 */
void staticbtn(struct ctlpos *cp, char *stext, int sid,
               char *btext, int bid) {
    const int height = (PUSHBTNHEIGHT > STATICHEIGHT ?
                        PUSHBTNHEIGHT : STATICHEIGHT);
    RECT r;
    int lwid, rwid, rpos;

    rpos = GAPBETWEEN + 3 * (cp->width + GAPBETWEEN) / 4;
    lwid = rpos - 2*GAPBETWEEN;
    rwid = cp->width + GAPBETWEEN - rpos;

    r.left = GAPBETWEEN; r.top = cp->ypos + (height-STATICHEIGHT)/2;
    r.right = lwid; r.bottom = STATICHEIGHT;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0, stext, sid);

    r.left = rpos; r.top = cp->ypos + (height-PUSHBTNHEIGHT)/2;
    r.right = rwid; r.bottom = PUSHBTNHEIGHT;
    doctl(cp, r, "BUTTON",
          WS_CHILD | WS_VISIBLE | WS_TABSTOP | BS_PUSHBUTTON,
          0,
          btext, bid);

    cp->ypos += height + GAPBETWEEN;
}

/*
 * An edit control on the right hand side, with a static to its left.
 */
static void staticedit_internal(struct ctlpos *cp, char *stext,
                                int sid, int eid, int percentedit,
                                int style) {
    const int height = (EDITHEIGHT > STATICHEIGHT ?
                        EDITHEIGHT : STATICHEIGHT);
    RECT r;
    int lwid, rwid, rpos;

    rpos = GAPBETWEEN + (100-percentedit) * (cp->width + GAPBETWEEN) / 100;
    lwid = rpos - 2*GAPBETWEEN;
    rwid = cp->width + GAPBETWEEN - rpos;

    r.left = GAPBETWEEN; r.top = cp->ypos + (height-STATICHEIGHT)/2;
    r.right = lwid; r.bottom = STATICHEIGHT;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0, stext, sid);

    r.left = rpos; r.top = cp->ypos + (height-EDITHEIGHT)/2;
    r.right = rwid; r.bottom = EDITHEIGHT;
    doctl(cp, r, "EDIT",
          WS_CHILD | WS_VISIBLE | WS_TABSTOP | ES_AUTOHSCROLL | style,
          WS_EX_CLIENTEDGE,
          "", eid);

    cp->ypos += height + GAPBETWEEN;
}

void staticedit(struct ctlpos *cp, char *stext,
                int sid, int eid, int percentedit) {
    staticedit_internal(cp, stext, sid, eid, percentedit, 0);
}

void staticpassedit(struct ctlpos *cp, char *stext,
                    int sid, int eid, int percentedit) {
    staticedit_internal(cp, stext, sid, eid, percentedit, ES_PASSWORD);
}

/*
 * A big multiline edit control with a static labelling it.
 */
void bigeditctrl(struct ctlpos *cp, char *stext,
                 int sid, int eid, int lines) {
    RECT r;

    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = cp->width; r.bottom = STATICHEIGHT;
    cp->ypos += r.bottom + GAPWITHIN;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0, stext, sid);

    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = cp->width; r.bottom = EDITHEIGHT + (lines-1) * STATICHEIGHT;
    cp->ypos += r.bottom + GAPBETWEEN;
    doctl(cp, r, "EDIT",
          WS_CHILD | WS_VISIBLE | WS_TABSTOP | WS_VSCROLL | ES_MULTILINE,
          WS_EX_CLIENTEDGE,
          "", eid);
}

/*
 * A tab-control substitute when a real tab control is unavailable.
 */
void ersatztab(struct ctlpos *cp, char *stext, int sid,
               int lid, int s2id) {
    const int height = (COMBOHEIGHT > STATICHEIGHT ?
                        COMBOHEIGHT : STATICHEIGHT);
    RECT r;
    int bigwid, lwid, rwid, rpos;
    static const int BIGGAP = 15;
    static const int MEDGAP = 3;

    bigwid = cp->width + 2*GAPBETWEEN - 2*BIGGAP;
    cp->ypos += MEDGAP;
    rpos = BIGGAP + (bigwid + BIGGAP) / 2;
    lwid = rpos - 2*BIGGAP;
    rwid = bigwid + BIGGAP - rpos;

    r.left = BIGGAP; r.top = cp->ypos + (height-STATICHEIGHT)/2;
    r.right = lwid; r.bottom = STATICHEIGHT;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0, stext, sid);

    r.left = rpos; r.top = cp->ypos + (height-COMBOHEIGHT)/2;
    r.right = rwid; r.bottom = COMBOHEIGHT*10;
    doctl(cp, r, "COMBOBOX",
          WS_CHILD | WS_VISIBLE | WS_TABSTOP |
          CBS_DROPDOWNLIST | CBS_HASSTRINGS,
          WS_EX_CLIENTEDGE,
          "", lid);

    cp->ypos += height + MEDGAP + GAPBETWEEN;

    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = cp->width; r.bottom = 2;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE | SS_ETCHEDHORZ,
          0, "", s2id);
}

/*
 * A static line, followed by an edit control on the left hand side
 * and a button on the right.
 */
void editbutton(struct ctlpos *cp, char *stext, int sid,
                int eid, char *btext, int bid) {
    const int height = (EDITHEIGHT > PUSHBTNHEIGHT ?
                        EDITHEIGHT : PUSHBTNHEIGHT);
    RECT r;
    int lwid, rwid, rpos;

    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = cp->width; r.bottom = STATICHEIGHT;
    cp->ypos += r.bottom + GAPWITHIN;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0, stext, sid);

    rpos = GAPBETWEEN + 3 * (cp->width + GAPBETWEEN) / 4;
    lwid = rpos - 2*GAPBETWEEN;
    rwid = cp->width + GAPBETWEEN - rpos;

    r.left = GAPBETWEEN; r.top = cp->ypos + (height-EDITHEIGHT)/2;
    r.right = lwid; r.bottom = EDITHEIGHT;
    doctl(cp, r, "EDIT",
          WS_CHILD | WS_VISIBLE | WS_TABSTOP | ES_AUTOHSCROLL,
          WS_EX_CLIENTEDGE,
          "", eid);

    r.left = rpos; r.top = cp->ypos + (height-PUSHBTNHEIGHT)/2;
    r.right = rwid; r.bottom = PUSHBTNHEIGHT;
    doctl(cp, r, "BUTTON",
          WS_CHILD | WS_VISIBLE | WS_TABSTOP | BS_PUSHBUTTON,
          0,
          btext, bid);

    cp->ypos += height + GAPBETWEEN;
}

/*
 * Special control which was hard to describe generically: the
 * session-saver assembly. A static; below that an edit box; below
 * that a list box. To the right of the list box, a column of
 * buttons.
 */
void sesssaver(struct ctlpos *cp, char *text,
               int staticid, int editid, int listid, ...) {
    RECT r;
    va_list ap;
    int lwid, rwid, rpos;
    int y;
    const int LISTDEFHEIGHT = 66;

    rpos = GAPBETWEEN + 3 * (cp->width + GAPBETWEEN) / 4;
    lwid = rpos - 2*GAPBETWEEN;
    rwid = cp->width + GAPBETWEEN - rpos;

    /* The static control. */
    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = lwid; r.bottom = STATICHEIGHT;
    cp->ypos += r.bottom + GAPWITHIN;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0, text, staticid);

    /* The edit control. */
    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = lwid; r.bottom = EDITHEIGHT;
    cp->ypos += r.bottom + GAPWITHIN;
    doctl(cp, r, "EDIT",
          WS_CHILD | WS_VISIBLE | WS_TABSTOP | ES_AUTOHSCROLL,
          WS_EX_CLIENTEDGE,
          "", editid);

    /*
     * The buttons (we should hold off on the list box until we
     * know how big the buttons are).
     */
    va_start(ap, listid);
    y = cp->ypos;
    while (1) {
        char *btext = va_arg(ap, char *);
        int bid;
        if (!btext) break;
        bid = va_arg(ap, int);
        r.left = rpos; r.top = y;
        r.right = rwid; r.bottom = PUSHBTNHEIGHT;
        y += r.bottom + GAPWITHIN;
        doctl(cp, r, "BUTTON",
              WS_CHILD | WS_VISIBLE | WS_TABSTOP | BS_PUSHBUTTON,
              0,
              btext, bid);
    }

    /* Compute list box height. LISTDEFHEIGHT, or height of buttons. */
    y -= cp->ypos;
    y -= GAPWITHIN;
    if (y < LISTDEFHEIGHT) y = LISTDEFHEIGHT;
    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = lwid; r.bottom = y;
    cp->ypos += y + GAPBETWEEN;
    doctl(cp, r, "LISTBOX",
          WS_CHILD | WS_VISIBLE | WS_TABSTOP | WS_VSCROLL | 
          LBS_NOTIFY | LBS_HASSTRINGS,
          WS_EX_CLIENTEDGE,
          "", listid);
}

/*
 * Another special control: the environment-variable setter. A
 * static line first; then a pair of edit boxes with associated
 * statics, and two buttons; then a list box.
 */
void envsetter(struct ctlpos *cp, char *stext, int sid,
               char *e1stext, int e1sid, int e1id,
               char *e2stext, int e2sid, int e2id,
               int listid,
               char *b1text, int b1id, char *b2text, int b2id) {
    RECT r;
    const int height = (STATICHEIGHT > EDITHEIGHT && STATICHEIGHT > PUSHBTNHEIGHT ?
                        STATICHEIGHT :
                        EDITHEIGHT > PUSHBTNHEIGHT ?
                        EDITHEIGHT : PUSHBTNHEIGHT);
    const static int percents[] = { 20, 35, 10, 25 };
    int i, j, xpos, percent;
    const int LISTHEIGHT = 42;

    /* The static control. */
    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = cp->width; r.bottom = STATICHEIGHT;
    cp->ypos += r.bottom + GAPWITHIN;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0, stext, sid);

    /* The statics+edits+buttons. */
    for (j = 0; j < 2; j++) {
        percent = 10;
        for (i = 0; i < 4; i++) {
            xpos = (cp->width + GAPBETWEEN) * percent / 100;
            r.left = xpos + GAPBETWEEN;
            percent += percents[i];
            xpos = (cp->width + GAPBETWEEN) * percent / 100;
            r.right = xpos - r.left;
            r.top = cp->ypos;
            r.bottom = (i==0 ? STATICHEIGHT :
                        i==1 ? EDITHEIGHT :
                        PUSHBTNHEIGHT);
            r.top += (height-r.bottom)/2;
            if (i==0) {
                doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0,
                      j==0 ? e1stext : e2stext, j==0 ? e1sid : e2sid);
            } else if (i==1) {
                doctl(cp, r, "EDIT",
                      WS_CHILD | WS_VISIBLE | WS_TABSTOP | ES_AUTOHSCROLL,
                      WS_EX_CLIENTEDGE,
                      "", j==0 ? e1id : e2id);
            } else if (i==3) {
                doctl(cp, r, "BUTTON",
                      WS_CHILD | WS_VISIBLE | WS_TABSTOP | BS_PUSHBUTTON,
                      0,
                      j==0 ? b1text : b2text, j==0 ? b1id : b2id);
            }
        }
        cp->ypos += height + GAPWITHIN;
    }

    /* The list box. */
    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = cp->width; r.bottom = LISTHEIGHT;
    cp->ypos += r.bottom + GAPBETWEEN;
    doctl(cp, r, "LISTBOX",
          WS_CHILD | WS_VISIBLE | WS_TABSTOP | WS_VSCROLL | LBS_HASSTRINGS |
          LBS_USETABSTOPS,
          WS_EX_CLIENTEDGE,
          "", listid);
}

/*
 * Yet another special control: the character-class setter. A
 * static, then a list, then a line containing a
 * button-and-static-and-edit. 
 */
void charclass(struct ctlpos *cp, char *stext, int sid, int listid,
               char *btext, int bid, int eid, char *s2text, int s2id) {
    RECT r;
    const int height = (STATICHEIGHT > EDITHEIGHT && STATICHEIGHT > PUSHBTNHEIGHT ?
                        STATICHEIGHT :
                        EDITHEIGHT > PUSHBTNHEIGHT ?
                        EDITHEIGHT : PUSHBTNHEIGHT);
    const static int percents[] = { 30, 40, 30 };
    int i, xpos, percent;
    const int LISTHEIGHT = 66;

    /* The static control. */
    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = cp->width; r.bottom = STATICHEIGHT;
    cp->ypos += r.bottom + GAPWITHIN;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0, stext, sid);

    /* The list box. */
    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = cp->width; r.bottom = LISTHEIGHT;
    cp->ypos += r.bottom + GAPWITHIN;
    doctl(cp, r, "LISTBOX",
          WS_CHILD | WS_VISIBLE | WS_TABSTOP | WS_VSCROLL | LBS_HASSTRINGS |
          LBS_USETABSTOPS,
          WS_EX_CLIENTEDGE,
          "", listid);

    /* The button+static+edit. */
    percent = xpos = 0;
    for (i = 0; i < 3; i++) {
        r.left = xpos + GAPBETWEEN;
        percent += percents[i];
        xpos = (cp->width + GAPBETWEEN) * percent / 100;
        r.right = xpos - r.left;
        r.top = cp->ypos;
        r.bottom = (i==0 ? PUSHBTNHEIGHT :
                    i==1 ? STATICHEIGHT :
                    EDITHEIGHT);
        r.top += (height-r.bottom)/2;
        if (i==0) {
            doctl(cp, r, "BUTTON",
                  WS_CHILD | WS_VISIBLE | WS_TABSTOP | BS_PUSHBUTTON,
                  0, btext, bid);
        } else if (i==1) {
            doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE | SS_CENTER,
                  0, s2text, s2id);
        } else if (i==2) {
            doctl(cp, r, "EDIT",
                  WS_CHILD | WS_VISIBLE | WS_TABSTOP | ES_AUTOHSCROLL,
                  WS_EX_CLIENTEDGE, "", eid);
        }
    }
    cp->ypos += height + GAPBETWEEN;
}

/*
 * A special control (horrors!). The colour editor. A static line;
 * then on the left, a list box, and on the right, a sequence of
 * two-part statics followed by a button.
 */
void colouredit(struct ctlpos *cp, char *stext, int sid, int listid,
                char *btext, int bid, ...) {
    RECT r;
    int y;
    va_list ap;
    int lwid, rwid, rpos;
    const int LISTHEIGHT = 66;

    /* The static control. */
    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = cp->width; r.bottom = STATICHEIGHT;
    cp->ypos += r.bottom + GAPWITHIN;
    doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0, stext, sid);
    
    rpos = GAPBETWEEN + 2 * (cp->width + GAPBETWEEN) / 3;
    lwid = rpos - 2*GAPBETWEEN;
    rwid = cp->width + GAPBETWEEN - rpos;

    /* The list box. */
    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = lwid; r.bottom = LISTHEIGHT;
    doctl(cp, r, "LISTBOX",
          WS_CHILD | WS_VISIBLE | WS_TABSTOP | WS_VSCROLL | LBS_HASSTRINGS |
          LBS_USETABSTOPS | LBS_NOTIFY,
          WS_EX_CLIENTEDGE,
          "", listid);

    /* The statics. */
    y = cp->ypos;
    va_start(ap, bid);
    while (1) {
        char *ltext;
        int lid, rid;
        ltext = va_arg(ap, char *);
        if (!ltext) break;
        lid = va_arg(ap, int);
        rid = va_arg(ap, int);
        r.top = y; r.bottom = STATICHEIGHT;
        y += r.bottom + GAPWITHIN;
        r.left = rpos; r.right = rwid/2;
        doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE, 0, ltext, lid);
        r.left = rpos + r.right; r.right = rwid - r.right;
        doctl(cp, r, "STATIC", WS_CHILD | WS_VISIBLE | SS_RIGHT, 0, "", rid);
    }
    va_end(ap);

    /* The button. */
    r.top = y + 2*GAPWITHIN; r.bottom = PUSHBTNHEIGHT;
    r.left = rpos; r.right = rwid;
    doctl(cp, r, "BUTTON",
          WS_CHILD | WS_VISIBLE | WS_TABSTOP | BS_PUSHBUTTON,
          0, btext, bid);

    cp->ypos += LISTHEIGHT + GAPBETWEEN;
}

/*
 * A progress bar (from Common Controls). We like our progress bars
 * to be smooth and unbroken, without those ugly divisions; some
 * older compilers may not support that, but that's life.
 */
void progressbar(struct ctlpos *cp, int id) {
    RECT r;

    r.left = GAPBETWEEN; r.top = cp->ypos;
    r.right = cp->width; r.bottom = PROGBARHEIGHT;
    cp->ypos += r.bottom + GAPBETWEEN;

    doctl(cp, r, PROGRESS_CLASS,
          WS_CHILD | WS_VISIBLE
#ifdef PBS_SMOOTH
          | PBS_SMOOTH
#endif
          , WS_EX_CLIENTEDGE, "", id);
}