Plan 9 from Bell Labs’s /usr/web/sources/contrib/fgb/cmd/slider.c

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
Download the Plan 9 distribution.


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


Controlset *cs;
int ctldeletequits = 1;

char *colornames[3] = 
{
	"white",
	"black",
	"red"
};

char *label = "slider";

void
resizecontrolset(Controlset*)
{
	Rectangle r;

	if(getwindow(display, Refnone) < 0)
		sysfatal("resize failed: %r");
	r = insetrect(screen->r, 5);
	chanprint(cs->ctl, "slider rect %R \nslider show", r);
}

void
threadmain(int argc, char *argv[])
{
	Control *slider;
	Channel *c;
	char *s, *args[3];
	int i, max;

	max = 100;
	ARGBEGIN{
	case 'c':
		for(i=0; i<3; i++){
			colornames[i] = ARGF();
			if(colornames[i] == nil)
				goto Usage;
		}
		break;
	case 'l':
		label = ARGF();
		if(label == nil)
			goto Usage;
		break;
	case 'm':
		s = ARGF();
		if(s == nil)
			goto Usage;
		max = atoi(s);
		if(max <= 0)
			goto Usage;
		break;
	default:
    Usage:
		fprint(2, "usage: slider [-c bgcol bdcol indicol] [-l label] [-m max]\n");
		exits("usage");
	}ARGEND

	if(initdraw(0, 0, label) < 0)
		sysfatal("can't open display");

	initcontrols();
	cs = newcontrolset(screen, nil, nil, nil);

	slider = createslider(cs, "slider");
	chanprint(cs->ctl, "slider border 1");
	chanprint(cs->ctl, "slider image %s", colornames[0]);
	chanprint(cs->ctl, "slider bordercolor %s", colornames[1]);
	chanprint(cs->ctl, "slider indicatorcolor %s", colornames[2]);
	chanprint(cs->ctl, "slider max %d", max);
	chanprint(cs->ctl, "slider clamp low 1");
	chanprint(cs->ctl, "slider orient horizontal");

	c = chancreate(sizeof(char*), 0);
	controlwire(slider, "event", c);
	activate(slider);
	resizecontrolset(cs);
	for(;;){
		s = recvp(c);
		i = tokenize(s, args, nelem(args));
		if(i==3 && strcmp(args[1], "value")==0)
			print("%s\n", args[2]);
		free(s);
	}
}

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