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/* xmenu
* a simple fuzzy-selection menu made with Xlib
*/
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/XKBlib.h>
#include <stdio.h>
#include "ui.h"
#include "dynarr.h"
static Display *dsp;
static Window win;
static int scr;
static unsigned long fg, bg;
static XSizeHints szhint;
static GC gc;
static Atom wm_delete_window;
static XFontStruct *freg, *fital;
/* TODO: center menu on screen */
void
ui_init(int argc, char **argv, UiOpts opt)
{
dsp = XOpenDisplay(NULL);
scr = DefaultScreen(dsp);
fg = BlackPixel(dsp, scr);
bg = WhitePixel(dsp, scr);
int scr_width = XWidthOfScreen(ScreenOfDisplay(dsp, scr));
int scr_height = XHeightOfScreen(ScreenOfDisplay(dsp, scr));
szhint = (XSizeHints) { 0 };
szhint.width = 350;
szhint.height = 250;
szhint.flags = PSize;
win = XCreateSimpleWindow(
dsp,
DefaultRootWindow(dsp),
szhint.x, szhint.y,
szhint.width, szhint.height,
2 /* border width */,
fg, bg);
/* TODO: replace with modern XSetWMProperties */
char title[] = "xmenu";
XSetStandardProperties(dsp, win, title, title,
None, argv, argc, &szhint);
gc = XCreateGC(dsp, win, 0, 0);
XSetBackground(dsp, gc, bg);
XSetForeground(dsp, gc, fg);
XSelectInput(dsp, win, KeyPressMask | ExposureMask);
wm_delete_window = XInternAtom(dsp, "WM_DELETE_WINDOW", False);
XSetWMProtocols(dsp, win, &wm_delete_window, 1);
/* TODO: error checking */
freg = XLoadQueryFont(dsp, "-*-new century schoolbook-medium-r-*-*-24-*-*-*-*-*-*-*");
fital = XLoadQueryFont(dsp, "-*-new century schoolbook-medium-i-*-*-24-*-*-*-*-*-*-*");
int w = 0;
for (int i = 0; i < opt.n; i++) {
int ow = XTextWidth(freg, opt.v[i].s, opt.v[i].n);
if (ow > w) w = ow;
}
int h = 24 * (opt.n + 1);
int margin = 64;
if (w > scr_width - 2*margin) w = scr_width - 2*margin;
if (h > scr_height - 2*margin) h = scr_height - 2*margin;
XResizeWindow(dsp, win, w + 32, h + 32);
XSetTransientForHint(dsp, win, DefaultRootWindow(dsp));
XMoveWindow(dsp, win,
(scr_width - w - 32) / 2,
(scr_height - h - 32) / 2
);
XMapRaised(dsp, win);
}
UiKey
xksym_to_uik(KeySym sym)
{
switch (sym) {
case XK_Escape: return UIK_ESCAPE;
case XK_BackSpace: return UIK_BACKSPACE;
case XK_Up: return UIK_UP;
case XK_Down: return UIK_DOWN;
case XK_Left: return UIK_LEFT;
case XK_Right: return UIK_RIGHT;
case XK_Return: return UIK_RETURN;
case XK_Home: return UIK_HOME;
case XK_End: return UIK_END;
case XK_Page_Down: return UIK_PGDN;
case XK_Page_Up: return UIK_PGUP;
default: return UIK_UNKNOWN;
}
}
/* TODO: allow selecting options with mouse */
int
ui_wait_event(UiEvent *e)
{
XEvent ev;
KeySym sym;
loop:
XNextEvent(dsp, &ev);
switch (ev.type) {
case KeyPress:
e->type = UI_KEY_DOWN;
e->key.strn = XLookupString(&ev.xkey, e->key.str, 10, &sym, 0);
e->key.key = xksym_to_uik(sym);
return 1;
case KeyRelease:
e->type = UI_KEY_UP;
e->key.strn = XLookupString(&ev.xkey, e->key.str, 10, &sym, 0);
e->key.key = xksym_to_uik(sym);
return 1;
case Expose:
e->type = UI_REDRAW;
return 1;
case ClientMessage:
if (ev.xclient.data.l[0] == wm_delete_window) {
e->type = UI_QUIT;
return 1;
}
break;
}
fprintf(stderr, "[Unknown event %d]\n", ev.type);
goto loop;
return 0;
}
void
ui_draw(Str input, int inpi, int seli, UiOpts o)
{
XWindowAttributes attr;
XClearWindow(dsp, win);
XGetWindowAttributes(dsp, win, &attr);
/* draw input */
XSetFont(dsp, gc, fital->fid);
XDrawString(dsp, win, gc, 16, 32, input.s, input.n);
int w = XTextWidth(fital, input.s, inpi);
XDrawLine(dsp, win, gc,
16 + w, 32 - fital->ascent,
16 + w, 32 + fital->descent);
/* draw options */
XSetFont(dsp, gc, freg->fid);
int y = 64;
int lines = (attr.height - 32) / 24;
int tline = lines / 2;
int bline = lines - tline;
int scroll = seli;
if (scroll > o.n - bline) scroll = o.n - bline;
if (scroll < tline) scroll = tline;
int top = scroll - tline;
int bot = scroll + bline;
if (top < 0) top = 0;
if (bot > o.n) bot = o.n;
for (int i = top; i < bot; i++) {
if (i == seli) {
int w = XTextWidth(freg, o.v[i].s, o.v[i].n);
XFillRectangle(dsp, win, gc,
16, y - freg->ascent,
w, freg->descent + freg->ascent);
XSetForeground(dsp, gc, bg);
XDrawString(dsp, win, gc,
16, y,
o.v[i].s, o.v[i].n);
XSetForeground(dsp, gc, fg);
} else {
XDrawString(dsp, win, gc,
16, y,
o.v[i].s, o.v[i].n);
}
y += 24;
}
}
void
ui_fini(void)
{
XFreeFont(dsp, freg);
XFreeFont(dsp, fital);
XFreeGC(dsp, gc);
XDestroyWindow(dsp, win);
XCloseDisplay(dsp);
}
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