Re: [dwm] xgamma notify

[markus schnalke]

[2009-03-06 07:04] Samuel Baldwin <shardz4...@gmail.com>
> 2009/3/6 pancake <panc...@youterm.com>:
> > I have been playing a bit with xgamma and I think it can be useful as a
> > graphical
> > notification for important alerts like low battery or so.
> >
> > The usage is quite simple. and we can 'flash' the screen in red for a
> > fraction of a second with:
> 
> What happens if you're not looking at the screen?

I modified `slock' some time ago to display a fullscreen red window
that closes on any button press. I use it to notify about low battery.

The code is attached.

Example usage:

        $ ./redscr
        < a red windows appears >

        $ ./redscr 336699
        < a baby blue window appears >



meillo

/* © 2006-2007 Anselm R. Garbe <garbeam at gmail dot com>
 * See LICENSE file for license details. */
/* #define _XOPEN_SOURCE 500 */
#define VERSION "0.8"

#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <X11/Xlib.h>


int main(int argc, char* argv[]) {
	char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
	int screen;
	unsigned int len;
	char screencolor[8] = "#660000";
	Cursor invisible;
	Display *dpy;
	Pixmap pmap;
	Window root, w;
	XColor black, dummy;
	XEvent ev;
	XSetWindowAttributes wa;

/* 	printf("argc: %d\n", argc); */

	if (argc > 2) {
		/* invalid option */
		fprintf(stderr, "usage: redscr [--version]\n"
		                "       redscr <color> (color has to be 6 hex chars)\n");
		exit(EXIT_FAILURE);
	}

	if ((argc == 2) && (strcmp("--version", argv[1]) == 0)) {
		/* version information */
		fprintf(stderr, "redscr-%s, (c) 2006-2007 Anselm R. Garbe, 2007 markus schnalke\n", VERSION);
		exit(EXIT_SUCCESS);
	}

	if ((argc == 2)) {
		/* set color */
/* 		printf("arg: %s", argv[1]); */
		screencolor[0] = '#';
		screencolor[1] = '\0';
		strcat(screencolor, argv[1]);
/* 		printf("color is: %s", screencolor); */
	}

	if(!(dpy = XOpenDisplay(0))) {
		fprintf(stderr, "redscr: cannot open display\n");
		exit(EXIT_FAILURE);
	}




	/* init */
	screen = DefaultScreen(dpy);
	root = RootWindow(dpy, screen);

	Colormap cmap = DefaultColormap(dpy, screen);
	XColor color;

	if(!XAllocNamedColor(dpy, cmap, screencolor, &color, &color)) {
		fprintf(stderr,"error, cannot allocate color\n");
		exit(EXIT_FAILURE);
	}

	wa.override_redirect = 1;
	wa.background_pixel = color.pixel;

	w = XCreateWindow(dpy, root, 0, 0, DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
	    0, DefaultDepth(dpy, screen), CopyFromParent, DefaultVisual(dpy, screen),
	    CWOverrideRedirect | CWBackPixel, &wa);
	XAllocNamedColor(dpy, DefaultColormap(dpy, screen), "black", &black, &dummy);
	pmap = XCreateBitmapFromData(dpy, w, curs, 8, 8);
	invisible = XCreatePixmapCursor(dpy, pmap, pmap, &black, &black, 0, 0);
	XDefineCursor(dpy, w, invisible);
	XMapRaised(dpy, w);

	for(len = 1000; len; len--) {
		if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess)
			break;
		usleep(1000);
	}

	/* main event loop */
	while (ev.type != KeyPress) {
		XNextEvent(dpy, &ev);
		usleep(100000);
	}

	XFreePixmap(dpy, pmap);
	XDestroyWindow(dpy, w);
	XCloseDisplay(dpy);
	return 0;
}

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