Initial commit.

1 files changed, 166 insertions, 0 deletions

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+/*
+	xdeadzone - create a window and don't allow the mouse pointer to enter it.
+
+	compile me with:
+
+	gcc -Wall -o xdeadzone xdeadzone.c -lX11
+
+	run me with ./xdeadzone, and be prepared to hit ^C or use kill to exit,
+	since it doesn't have any other way to exit (currently).
+*/
+
+#include <X11/Xlib.h>
+#include <X11/Xatom.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#ifndef VERSION
+#  define VERSION "UnknownVersion"
+#endif
+
+#define NAME "XDeadZone"
+
+const char *exename;
+
+void set_exename(const char *p) {
+	exename = p;
+	while(*p) {
+		if(*p == '/') exename = p + 1;
+		p++;
+	}
+	printf("exename: %s\n", exename);
+}
+
+void usage(char *name, int ret) {
+	printf(
+			NAME " " VERSION "\n"
+			"Usage:\n  %s "
+			"[-nw | -ne | -sw | -se | -abs xpos ypos] [width] [height]"
+			"\n",
+			name);
+	exit(ret);
+}
+
+void errmsg(char *name, char *msg) {
+	fprintf(stderr, "%s: %s\n", name, msg);
+	usage(name, 1);
+}
+
+int main(int argc, char **argv) {
+	Display *d;
+	Window w;
+	XEvent ev;
+	Atom dock_atom;
+	XWindowAttributes attr;
+	XSetWindowAttributes setattr;
+	int screen;
+
+	int done = 0;
+	int x = 0, y = 0, width = 0, height = 0;
+
+	if(argc == 2 && strcmp(argv[1], "--help") == 0)
+		usage(argv[0], 0);
+
+	if(strcmp(argv[1], "-abs") == 0) {
+		if(argc != 6)
+			errmsg(argv[0], "wrong number of arguments for -abs");
+		x = atoi(argv[2]);
+		y = atoi(argv[3]);
+		width = atoi(argv[4]);
+		height = atoi(argv[5]);
+	} else {
+		if(argc != 4)
+			errmsg(argv[0], "wrong number of arguments for -nw/-ne/-sw/-se");
+		width = atoi(argv[2]);
+		height = atoi(argv[3]);
+		if(strcmp(argv[1], "-nw") == 0) {
+			x = 0; y = 0;
+		} else if(strcmp(argv[1], "-ne") == 0) {
+			x = -width; y = 0;
+		} else if(strcmp(argv[1], "-sw") == 0) {
+			x = 0; y = -height;
+		} else if(strcmp(argv[1], "-se") == 0) {
+			x = -width; y = -height;
+		} else {
+			errmsg(argv[0], "invalid 1st argument (not -abs/-nw/-ne/-sw/-se)");
+		}
+	}
+
+	if(width <= 0 || height <= 0)
+		errmsg(argv[0], "width and height must be positive and non-zero");
+
+	if(!(d = XOpenDisplay(NULL)))
+		errmsg(argv[0], "can't open X display");
+
+	XGetWindowAttributes(d, DefaultRootWindow(d), &attr);
+	if(x < 0) x = attr.width  + x;
+	if(y < 0) y = attr.height + y;
+
+	printf("X size %d x %d, x %d, y %d, width %d, height %d\n", attr.width, attr.height, x, y, width, height);
+
+	/* Create window with override_redirect enabled, to tell the window
+		manager not to decorate it with a titlebar or resize frame.
+		Also, we really only care about EnterNotify events.
+		Set the window to solid white, to make it easy to see during testing.
+		In actual use, the window won't be visible, it'll be in the dead zone,
+		right?
+	 */
+	screen = DefaultScreen(d);
+	setattr.override_redirect = True;
+	setattr.background_pixel = WhitePixel(d, screen);
+	setattr.event_mask = EnterWindowMask;
+
+	w = XCreateWindow(d,
+			RootWindow(d, screen),
+			x, y, width, height, 0,
+			DefaultDepth(d, screen),
+			InputOutput,
+			DefaultVisual(d, screen),
+			CWBackPixel | CWOverrideRedirect | CWEventMask,
+			&setattr);
+
+	XStoreName(d, w, NAME);
+
+	/* On most window managers, this makes the window stay on top and
+		be present on all virtual desktops. Tested, works with WindowMaker, Fvwm2,
+		KDE5, XFCE4, BlackBox, and FluxBox. On all but Fvwm2, it also
+		disappears the titlebar and resize frame... but we already took
+		care of that with override_redirect, above.
+		ref: http://standards.freedesktop.org/wm-spec/wm-spec-latest.html
+	 */
+	dock_atom = XInternAtom(d, "_NET_WM_WINDOW_TYPE_DOCK", False);
+	XChangeProperty(d,
+			w,
+			XInternAtom(d, "_NET_WM_WINDOW_TYPE", False),
+			XA_ATOM,
+			32,
+			PropModeReplace,
+			(unsigned char *) &dock_atom,
+			1);
+
+	XMapWindow(d, w);
+
+	/* have to do this after it's mapped, since the window manager might have
+	  	ignored the x and y in the XCreateWindow(). */
+	XMoveWindow(d, w, x, y);
+
+	while(!done) {
+		XNextEvent(d, &ev);
+		if(ev.type == EnterNotify) {
+			// printf("entered at %d, %d\n", ev.xcrossing.x_root, ev.xcrossing.y_root);
+			XWarpPointer(d,
+					None,
+					DefaultRootWindow(d),
+					0, 0, 0, 0,
+					ev.xcrossing.x_root,
+					(y == 0 ? y + height : y - 1));
+		}
+	}
+
+	XUnmapWindow(d, w);
+	XDestroyWindow(d, w);
+	XCloseDisplay(d);
+
+	return 0;
+}