shithub: mez

ref: 6d1b825eaca4da51d7b9860e3ff6a0e432c7f925
dir: /guitest.c/

#include <u.h>
#include <libc.h>
#include <draw.h>
#include <cursor.h>
#include <thread.h>
#include <mouse.h>
#include <keyboard.h>
#include <frame.h>
#include "mez.h"

Mousectl *mc;
Keyboardctl *kc;
char buf[32000];
Rune lorem[32000];

enum
{
	MOUSE,
	KEYBD,
	RESIZE,
	NCHAN,

	Scrollwid = 12,		/* width of scroll bar */
	Scrollgap = 4,		/* gap right of scroll bar */
	Margin = 4,	/* margin around text */
};

void
error(char *s)
{
	fprint(2, "%s: error: %s: %r\n", argv0, s);
	threadexits(s);
}

void*
emallocz(ulong sz, int clr)
{
	void *p;

	if((p = mallocz(sz, clr)) == nil)
		error("Out of memory");
	setmalloctag(p, getcallerpc(&sz));
	return p;
}

void*
erealloc(void *ptr, ulong size)
{
	void *p;

	if((p = realloc(ptr, size)) == nil)
		error("Out of memory");
	setmalloctag(p, getcallerpc(&ptr));
	return p;
}

uint
lines(Rune *text)
{
	Rune *e;
	uint l;

	e = text;
	for(l = 0; e != nil; l++)
		e = runestrchr(e+1, L'\n');
	return l;
}

#define max(a, b) ((a)>(b)?(a):(b))
#define min(a, b) ((a)<(b)?(a):(b))

void
textdraw(Text *t)
{
	Rectangle scrpos;

	draw(t->screen, t->screen->r, t->cols[BACK], nil, ZP);
	draw(t->screen, t->scrollr, t->cols[BORD], nil, ZP);

	scrpos = t->scrollr;
	scrpos.min.y = scrpos.min.y+max(0, Dy(scrpos))*t->topline/t->nlines;
	scrpos.max.y = scrpos.min.y+Dy(t->scrollr)*t->Frame.maxlines/t->nlines;
	scrpos = insetrect(scrpos, 1);
	draw(screen, scrpos, t->cols[BACK], nil, ZP);

	frinsert(t, t->text + t->lines[t->topline], t->text + t->textlen, 0);
	flushimage(display, 1);
}

void
textaddline(Text *t, uint sol)
{
	if(t->nlines == t->cap){
		t->cap *= 2;
		t->lines = erealloc(t->lines, t->cap*sizeof(*t->lines));
	}
	t->lines[t->nlines++] = sol;
}

void
textinit(Text *t)
{
	Rune *rp;
	uint sol;

	t->scrollr = t->screen->r;
	t->scrollr.max.x = t->screen->r.min.x + Scrollwid + 1;

	t->bodyr.min.x = t->screen->r.min.x + Scrollwid + Scrollgap + Margin;
	t->bodyr.min.y = t->screen->r.min.y;
	t->bodyr.max = t->screen->r.max;

	t->cap = 1024;
	t->lines = emallocz(t->cap*sizeof(*t->lines), 1);
	t->nlines = sol = 0;
	for(rp = t->text; *rp != L'\0'; rp++)
		if(*rp == L'\n'){
			textaddline(t, sol);
			sol = rp + 1 - t->text;
		}
	t->topline = 0;

	frclear(t, 0);
	frinit(t, t->bodyr, display->defaultfont, t->screen, t->cols);
}

void
texttopline(Text *t, int y)
{
	t->topline = min(t->nlines-1, max(0, y-t->scrollr.min.y)*t->nlines/Dy(t->scrollr));
}

void
threadmain(int argc, char **argv)
{
	Rune r, *rs;
	Mouse m;
	Chan *chan;
	char *s, *wsys;
	int len, fd;

	len = readn(0, buf, sizeof(buf));
	buf[len] = '\0';
	for(s = buf, rs = lorem; *s != '\0'; s+=len, rs++)
		len = chartorune(rs, s);
	*rs = L'\0';

	if(initdraw(nil, nil, "guitest") < 0)
		sysfatal("initdraw: %r");
	if((mc = initmouse(nil, screen)) == nil)
		sysfatal("initmouse failed: %r");
	if((kc = initkeyboard(nil)) == nil)
		sysfatal("initmouse failed: %r");

	chan = emallocz(sizeof(*chan), 1);

	chan->body.text = lorem;
	chan->body.textlen = runestrlen(chan->body.text);
	chan->body.cols[BACK] = allocimagemix(display, DPurpleblue, DWhite);
	chan->body.cols[HIGH] = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DDarkyellow);
	chan->body.cols[BORD] = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DPurpleblue);
	chan->body.cols[TEXT] = display->black;
	chan->body.cols[HTEXT] = display->black;
	chan->body.screen = screen;
	textinit(&chan->body);

	if((wsys = getenv("wsys")) == nil)
		sysfatal("cannot find $wsys: %r");
	if((fd = open(wsys, ORDWR)) < 0)
		sysfatal("cannot open $wsys: %r");
	if(mount(fd, -1, "/mnt/wsysnicks", MREPL, "new") < 0)
		sysfatal("cannot create new window: %r");
	if(gengetwindow(display, "/mnt/wsysnicks/winname", &chan->nicks.screen, &chan->nicks._screen, Refnone) < 0)
		sysfatal("cannot get window: %r");

	Alt a[NCHAN+1] = {
		[MOUSE] = {mc->c, &m, CHANRCV},
		[RESIZE] = {mc->resizec, nil, CHANRCV},
		[KEYBD] = {kc->c, &r, CHANRCV},
		[NCHAN] = {nil, nil, CHANEND},
	};
	textdraw(&chan->body);
	draw(chan->nicks.screen, chan->nicks.screen->r, chan->body.cols[HIGH], nil, ZP);
	flushimage(display, 1);
	for(;;)switch(alt(a)){
	default:
		break;
	case KEYBD:
		if(r == Kdel)
			goto end;
		break;
	case MOUSE:
		if(!ptinrect(m.xy, chan->body.scrollr))
			break;
		while(m.buttons == 2){
			texttopline(&chan->body, m.xy.y);
			textdraw(&chan->body);
			readmouse(mc);
			m = *mc;
		}
		break;
	case RESIZE:
		if(getwindow(display, Refnone) < 0)
			sysfatal("%s: %r", argv0);
		textinit(&chan->body);
		textdraw(&chan->body);
		break;
	}
end:
	unmount(nil, "/mnt/wsysnicks");
	threadexitsall(0);
}