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/* from https://bugs.kde.org/show_bug.cgi?id=201523 */
#include <stdio.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
/* Compile with "gcc -o decorations -Wall decorations.c -lX11" */
/* Set the decorations part of a window's _MOTIF_WM_HINTS property to
* enable or disable window decorations. */
static void SetMotifDecorationsHint(
Display* display, Window win, int show_decorations) {
fprintf(stderr, "Setting hint to %s decorations on 0x%x\n",
(show_decorations ? "show" : "hide"), win);
int values[3] = {
1 << 1, /* flags */
0, /* functions */
show_decorations
};
Atom atom = XInternAtom(display, "_MOTIF_WM_HINTS", False);
XChangeProperty(
display,
win,
atom, /* property */
atom, /* type */
32, /* format */
PropModeReplace,
(unsigned char*) values,
3); /* nelements */
}
int main(int argc, char** argv) {
if (argc != 2 || strcmp(argv[1], "-h") == 0) {
fprintf(stderr, "Usage: %s [show_decorations]\n", argv[0]);
return 1;
}
Display* display = XOpenDisplay(NULL);
if (!display) {
fprintf(stderr, "Couldn't open display\n");
return 1;
}
int screen = DefaultScreen(display);
const int width = 300, height = 200;
unsigned long black = BlackPixel(display, screen);
unsigned long white = WhitePixel(display, screen);
Window win = XCreateSimpleWindow(display,
RootWindow(display, screen),
0, /* x */
0, /* y */
width,
height,
0, /* border_width */
black, /* border */
white); /* background */
int showing_decorations = (strcmp(argv[1], "0") != 0);
SetMotifDecorationsHint(display, win, showing_decorations);
XSelectInput(display, win, ButtonPressMask);
XMapWindow(display, win);
while (1) {
XEvent event;
XNextEvent(display, &event);
if (event.type == ButtonPress) {
XButtonEvent be = event.xbutton;
if (be.button == 2) {
showing_decorations = !showing_decorations;
SetMotifDecorationsHint(display, win, showing_decorations);
}
}
}
return 0;
}
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