Re: [9fans] Good sample GUI code (window creation, management,

[erik quanstrom]

i don't think there are any tricks.  here's a pretty minimal program
that displays colors.  usage might be:

        color 0x448844FF 0x000055FF

- erik

----
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include <mouse.h>
#include <keyboard.h>

static  Mousectl        *m;
static  long    colors[1024];
static  Image   *c[1024];
static  int     ncolor;

int     rflag;

void
redraw(int)
{
        int i, x, y;
        ulong chan;

        chan = rflag ? CHAN3(CGreen, 8, CBlue, 8, CRed, 8) : RGB24;

        if(c[0] == 0)
                for(i = 0; i < ncolor; i++){
                        c[i] = allocimage(display, Rect(0, 0, 1, 1), chan, 1, 
colors[i]);
                        if(c[i] == 0)
                                sysfatal("allocimage: %r");
                }

        x = screen->r.min.x;
        y = screen->r.min.y;

        for(i = 0; i < ncolor; i++){
                draw(screen, Rect(x, y, x+48, y+48), c[i], nil, ZP);
                x += 50;
                if(x > screen->r.max.x-60){
                        x = screen->r.min.x;
                        y += 50;
                }
        }
}

void
resizeproc(void *)
{
        for(; recv(m->resizec, 0);){
                if(getwindow(display, Refnone) < 0){
                        fprint(2, "test: can't reattach to window\n");
                        threadexitsall("resize");
                }
                redraw(1);
                flushimage(display, 1);
        }
}

static void
drawe(Display*, char *e)
{
        fprint(2, "%s\n", e);
        threadexitsall("libdraw");
}

int
init(void)
{
//      newwindow("-dx 300 -dy 300");
        if(initdraw(drawe, 0, "test") < 0){
                fprint(2, "test: initdraw failed: %r");
                return -1;
        }
        m = initmouse(0, screen);
        return 0;
}

void
kbdproc(void*)
{
        Keyboardctl *k;

        k = initkeyboard(0);
        recv(k->c, 0);
        threadexitsall("");
}

void
mouseproc(void*)
{
        while(readmouse(m) >= 0)
                ;
        threadexitsall("readmouse");
}

void
usage(void)
{
        fprint(2, "usage: color [-r] color1 ...\n");
        threadexitsall("usage");
}

void
threadmain(int argc, char *argv[])
{
        ARGBEGIN{
        case 'r':
                rflag ^= rflag;
                break;
        default:
                usage();
        }ARGEND;

        if(argc == 0)
                usage();

        if(argc > nelem(colors))
                argc = nelem(colors);

        for(ncolor = 0; ncolor < argc; ncolor++)
                colors[ncolor] = strtoul(argv[ncolor], 0, 16);

        if(init() < 0)
                threadexitsall("initdraw");

        redraw(1);
        proccreate(kbdproc, 0, 1024);
        proccreate(mouseproc, 0, 8192);
        proccreate(resizeproc, 0, 8*8192);
        for(;;)
                sleep(10000);
}